Rahman Faizur Rafique | Kumoh National University of Technology (original) (raw)
Papers by Rahman Faizur Rafique
공동 추계학술발표회 (2000 …, 2011
... 발행정보, 공동 추계학술발표회(2000~) , 2011 권 , 단일호 , Startpage 227 , Endpage 228 , Totalpage 2. - 저자, ( R... more ... 발행정보, 공동 추계학술발표회(2000~) , 2011 권 , 단일호 , Startpage 227 , Endpage 228 , Totalpage 2. - 저자, ( Rahman Rafique ) , ( Prajwal Shrestha ) , ( Guntae Son ) , ( Je Yeon Moon ) , (Sohan Shrestha ) , ( Won Tae Lee ) , ( Seung Hwan Lee ). - 가격, 1,000 원. ...
Desalination, 2003
The feasibility of micellar-enhanced ultrafiltration to remove nutrients, nitrate and phosphate, ... more The feasibility of micellar-enhanced ultrafiltration to remove nutrients, nitrate and phosphate, was investigated with a cationic surfactant, cetlypyridmium chloride (CPC). The effects of surfactant molar ratios on the rejection of nitrate and phosphate and flux decline were studied. In the nitrate/phosphate/CPC system, as the molar ratio of nitrate: phosphate :
Materials Research Express, 2018
Recently extraordinary breakthroughs have been made towards applying nano-structured materials su... more Recently extraordinary breakthroughs have been made towards applying nano-structured materials such as carbon nanotubes (CNTs) and porous graphene membranes in water purification and desalination applications. In this regard, the potential of the electrochemically active carbon nanotube (CNTs) membrane has been highly strengthened for the last few decades. One of the main advantages for such approach is the capability of CNT channel to permit the water flow easily. The perusal of the literature showed that, the performance of CNT based membrane can be three times higher than that of the conventional membrane devices. The unique and excellent characteristics of CNT membrane can outperform the conventional polymer membranes. CNT membrane has been widely used to adsorb chemical and biological contaminants as well as ion separation from sea water due to their high stability, great flexibility, and large specific surface area. Electrochemically active CNT filters deliver further Electro-oxidation of the adsorbed contaminants. Usually polymeric membranes have flexible chains for which it fails to have well-defined pores necessary for filtration. On the contrary CNTs based filters can provide pores with appropriate sizes and configurations by tailoring the growth parameters. The narrow pores of CNTs are capable of filtering water while eliminating ions (Na+/Cl-). Even this type of membranes is capable of removing bacteria from water and heavy hydrocarbon from petroleum. However, the success of desalination entirely depends on the basic design of the CNT-based filter with detailed optimization of the process parameters. Polymer filters cannot be recurrently used through several cycles since elimination of fouling ingredients is difficult. Even though electrochemically active CNT-based membranes have lot of advantages due to their hydrophobic nature, high porosity and specific area; there are numerous traits, which are yet to be considered and optimized. Thus the intrinsic p
International Journal of Electrochemical Science, 2018
Cu 2 CdSnS 4 (CCTS) quaternary alloy nanostructure is an important material of enhancing the sens... more Cu 2 CdSnS 4 (CCTS) quaternary alloy nanostructure is an important material of enhancing the sensors effectiveness. CCTS nanostructures have been synthesized using ultrasonic and deposited on SiO 2 /Si substrate using sol-gel method and under annealing temperature; 400 o C. Structural optical, topographical and morphological properties of CCTS were explored using Ultraviolet-visible spectroscopy, X-ray diffraction (XRD), atomic force microscopy (AFM) and scanning electron microscopy (SEM), respectively. Interdigitated electrodes (IDEs) have been manufactured via deposited silver on CCTS/SiO 2 /Si substrate via a physical vapor deposition and hard mask. Electrical properties of fabricated IDEs are further evaluated as a function of voltage and frequency. The proposed IDEs can be used in subsequent studies to develop a biological sensor capable of detecting the DNA for many types of diseases in order to facilitate the combating and eradicating. The resulted values are in agreement with others.
Materials Research Express, 2018
A facile one-step hydrothermal synthesis of Hafnium oxide/Graphene (HfO2/Gr) Nanocomposite was su... more A facile one-step hydrothermal synthesis of Hafnium oxide/Graphene (HfO2/Gr) Nanocomposite was successfully synthesized. The crystallinity index and the overall phase transformation process during the synthesis process was observed using x-ray diffraction (XRD) pattern. The surface morphology of the prepared composite was analyzed using Scanning electron microscopy (SEM). Transmission electron microscopy studies (HR-TEM) were conducted to measure the particle sizes. The presence of different types of functional groups was confirmed using FT Raman spectroscopy. UV–Visible spectrum analysis with optical ingestion was conducted to observe the optical properties of the prepared sample. The dielectric properties and conductivity of the prepared sample were investigated whereby the frequencies and the temperatures were altered. The results showed that both the phenomenon of the dielectric consistent and the dielectric loss were frequency and temperature dependent. The thermal conductivity behavior of the prepared samples was checked by calculating AC conductivity values at various temperatures.
Journal of Experimental Nanoscience, 2018
In this research, a one step, facile route has been undertaken to synthesise copper oxide/reduced... more In this research, a one step, facile route has been undertaken to synthesise copper oxide/reduced graphene oxide (CuO/rGO) nanocomposites. X-ray powder diffraction analysis (XRD) was carried out to identity the crystalline structure and phase of the synthesised sample. Elemental analysis and surface morphological features were analysed using EDX and FESEM Images. Particle size as well as the shape of the as prepared composite was observed from HR-TEM images. Raman spectra illustrated the peak of the individual composite materials. The electrochemical properties of the prepared nanocomposite were investigated. The dielectric behaviour of the sample including dielectric constant, dielectric loss and AC conductivity was measured at various frequency levels. Temperature was varied accordingly to observe the effect of temperature on the dielectric properties of the sample.
Nanoscale research letters, Jan 3, 2018
In this research, a facile co-precipitation method was used to synthesize pure and Mg-doped ZnO n... more In this research, a facile co-precipitation method was used to synthesize pure and Mg-doped ZnO nanoparticles (NPs). The structure, morphology, chemical composition, and optical and antibacterial activity of the synthesized nanoparticles (NPs) were studied with respect to pure and Mg-doped ZnO concentrations (0-7.5 molar (M) %). X-ray diffraction pattern confirmed the presence of crystalline, hexagonal wurtzite phase of ZnO. Scanning electron microscope (SEM) images revealed that pure and Mg-doped ZnO NPs were in the nanoscale regime with hexagonal crystalline morphology around 30-110 nm. Optical characterization of the sample revealed that the band gap energy (E) decreased from 3.36 to 3.04 eV with an increase in Mg doping concentration. Optical absorption spectrum of ZnO redshifted as the Mg concentration varied from 2.5 to 7.5 M. Photoluminescence (PL) spectra showed UV emission peak around 400 nm. Enhanced visible emission between 430 and 600 nm with Mg doping indicated the defe...
PloS one, 2018
A cost-effective, facile hydrothermal approach was made for the synthesis of SnO2/graphene (Gr) n... more A cost-effective, facile hydrothermal approach was made for the synthesis of SnO2/graphene (Gr) nano-composites. XRD diffraction spectra clearly confirmed the presence of tetragonal crystal system of SnO2 which was maintaining its structure in both pure and composite materials' matrix. The stretching and bending vibrations of the functional groups were analyzed using FTIR analysis. FESEM images illustrated the surface morphology and the texture of the synthesized sample. HRTEM images confirmed the deposition of SnO2 nanoparticles over the surface of graphene nano-sheets. Raman Spectroscopic analysis was carried out to confirm the in-plane blending of SnO2 and graphene inside the composite matrix. The photocatalytic performance of the synthesized sample under UV irradiation using methylene blue dye was observed. Incorporation of grapheme into the SnO2 sample had increased the photocatalytic activity compared with the pure SnO2 sample. The electrochemical property of the synthesiz...
Author is alumni of both Asian Institute of Technology (AIT), Thailand & University of Dhaka, Ban... more Author is alumni of both Asian Institute of Technology (AIT), Thailand & University of Dhaka, Bangladesh. This book is a study of a partial fulfillment of the requirements for the degree of Master of Science and it is the determination of the level of Benzene, Toluene, Ethylbenzene & Xylenes (BTEX) inside and outside environment of a Petroleum Refinery Industry. BTEX expose to the atmosphere due to the refinery operations of petrochemicals occurred in industry. BTEX vapors are corrosive and toxic substance and can also pose drinking water hazard as they accumulate in ground water. They often stick together in contaminated site and they are more harmful to human than the non-human living things whereas Benzene alone is a well-known human carcinogen. Prolonged exposure to these compounds has harmful effects on kidney, liver and blood systems. The study was conducted in a refinery industry collecting samples from various sites and they were analyzed in modern Gas Chromatographic (GC-TD...
The modern evolution in nanotechnology has brought about a revolutionary trend in developing nove... more The modern evolution in nanotechnology has brought about a revolutionary trend in developing novel biomaterials with superior properties and functionalities for targeted biomedical applications including pharmaceutical applications in biomedicine. There has been a steadily increasing interest in using nanoparticles in biomedical applications such as targeted drug delivery, hyperthermia, photoablation therapy, biosensors, bioimaging, cell labeling, and gene delivery over the past few years. Their exceptional properties such as chemical stability, nontoxicity, biocompatibility, high saturation magnetization, and high magnetic susceptibility, metallic nanoparticles like silver (Ag) and gold (Au), bimetallic nanoparticles like iron cobalt (Fe–Co) and iron platinum (Fe–Pt), and metal oxides including titanium dioxide (TiO2), silica (SiO2), cerium dioxide (CeO2), and zinc oxide (ZnO), and especially the less studied nanoparticles such as silver (Ag), iron platinum (Fe–Pt), and titanium di...
* The NJIT Honor Code will be upheld, and any violations will be brought to the immediate attenti... more * The NJIT Honor Code will be upheld, and any violations will be brought to the immediate attention of the Dean of Students. * Students will be consulted with by the instructor and must agree to any modifications or deviations from the syllabus throughout the course of the semester.
Green Chemistry and Sustainable Technology, 2021
Emerging Technologies for Sustainable Desalination Handbook, 2018
Abstract Recently, extraordinary breakthroughs have been made toward applying nanostructured mate... more Abstract Recently, extraordinary breakthroughs have been made toward applying nanostructured materials such as carbon nanotubes (CNTs), porous graphene membranes in water purification, and desalination applications. In this regard, the potential of the electrochemically active CNT membrane has been highly strengthened for the last few decades. One of the main advantages of such approach is the capability of CNT channel to permit the water flow easily. The perusal of the literature showed that the performance of CNT-based membrane can be three times higher than that of the conventional membrane devices. The unique and excellent characteristics of CNT membrane can outperform the conventional polymer membranes. The CNT membrane has been widely used to adsorb chemical and biological contaminants as well as ion separation from seawater due to their high stability, great flexibility, and large specific surface area. Electrochemically active CNT filters deliver further electrooxidation of the adsorbed contaminants. Usually, polymeric membranes have flexible chains for which it fails to have well-defined pores necessary for filtration. On the contrary, CNT-based filters can provide pores with appropriate sizes and configurations by tailoring the growth parameters. The narrow pores of CNTs are capable of filtering water while eliminating ions (Na+/Cl−). Even this type of membrane is capable of removing bacteria from water and heavy hydrocarbon from petroleum. However, the success of desalination entirely depends on the basic design of the CNT-based filter with detailed optimization of the process parameters. Polymer filters cannot be recurrently used through several cycles since the elimination of fouling ingredients is difficult. Even though electrochemically active CNT-based membranes have lot of advantages due to their hydrophobic nature, high porosity and specific area; there are numerous traits, which are yet to be considered and optimized. Thus, the intrinsic properties of CNT and the fabrication of the membrane could be critical factors for their applicability in various water treatment processes. This chapter provides an explicit and systematic overview of the recent progress of electrochemically active CNT membranes addressing the current prevalent problems associated with water treatment and desalination. The physiochemical aspect including the working principles of this type of membrane have been discussed. The prevailing challenges and future perceptions are also discussed.
Pyrolysis, 2017
Lignocellulosic biomass is a potentially more valuable renewable resource that can be utilized ef... more Lignocellulosic biomass is a potentially more valuable renewable resource that can be utilized effusively as a chief source of heat for cooking and can correspondingly subsidize the production of electricity, heat, biofuels and chemicals including solid fuel like char or carbon. Lignocellulosic residues are mixed and burnt with coal to generate electricity. Presently, crude oil is replaced by bioethanol and biodiesel produced from biomass substrate. Some special class of chemicals can be derived from biomass that can subsequently replace the usage of non-renewable resources of oil and coal. Pyrolysis of woody biomass to obtain pyroliginous acid was started hundreds of years ago, which has versatile applications. The range of products that can be derived from biomass is huge, prompting extent of research using different types of thermal conversion technologies, including pyrolysis, gasification, torrefaction, anaerobic digestion and hydrothermal processing. This chapter provides insights about the stages of reaction during pyrolysis and the outcome of reaction conditions on the products. Technical development and adjustment of process condition can offer a suitable environmentally benign scheme to increase the energy density of the lignocellulosic residues.
Materials Research Express, 2018
Recently extraordinary breakthroughs have been made towards applying nano-structured materials su... more Recently extraordinary breakthroughs have been made towards applying nano-structured materials such as carbon nanotubes (CNTs) and porous graphene membranes in water purification and desalination applications. In this regard, the potential of the electrochemically active carbon nanotube (CNTs) membrane has been highly strengthened for the last few decades. One of the main advantages for such approach is the capability of CNT channel to permit the water flow easily. The perusal of the literature showed that, the performance of CNT based membrane can be three times higher than that of the conventional membrane devices. The unique and excellent characteristics of CNT membrane can outperform the conventional polymer membranes. CNT membrane has been widely used to adsorb chemical and biological contaminants as well as ion separation from sea water due to their high stability, great flexibility, and large specific surface area. Electrochemically active CNT filters deliver further Electro-oxidation of the adsorbed contaminants. Usually polymeric membranes have flexible chains for which it fails to have well-defined pores necessary for filtration. On the contrary CNTs based filters can provide pores with appropriate sizes and configurations by tailoring the growth parameters. The narrow pores of CNTs are capable of filtering water while eliminating ions (Na+/Cl-). Even this type of membranes is capable of removing bacteria from water and heavy hydrocarbon from petroleum. However, the success of desalination entirely depends on the basic design of the CNT-based filter with detailed optimization of the process parameters. Polymer filters cannot be recurrently used through several cycles since elimination of fouling ingredients is difficult. Even though electrochemically active CNT-based membranes have lot of advantages due to their hydrophobic nature, high porosity and specific area; there are numerous traits, which are yet to be considered and optimized. Thus the intrinsic p
International Journal of Electrochemical Science, 2018
Cu 2 CdSnS 4 (CCTS) quaternary alloy nanostructure is an important material of enhancing the sens... more Cu 2 CdSnS 4 (CCTS) quaternary alloy nanostructure is an important material of enhancing the sensors effectiveness. CCTS nanostructures have been synthesized using ultrasonic and deposited on SiO 2 /Si substrate using sol-gel method and under annealing temperature; 400 o C. Structural optical, topographical and morphological properties of CCTS were explored using Ultraviolet-visible spectroscopy, X-ray diffraction (XRD), atomic force microscopy (AFM) and scanning electron microscopy (SEM), respectively. Interdigitated electrodes (IDEs) have been manufactured via deposited silver on CCTS/SiO 2 /Si substrate via a physical vapor deposition and hard mask. Electrical properties of fabricated IDEs are further evaluated as a function of voltage and frequency. The proposed IDEs can be used in subsequent studies to develop a biological sensor capable of detecting the DNA for many types of diseases in order to facilitate the combating and eradicating. The resulted values are in agreement with others.
Materials Research Express, 2018
A facile one-step hydrothermal synthesis of Hafnium oxide/Graphene (HfO2/Gr) Nanocomposite was su... more A facile one-step hydrothermal synthesis of Hafnium oxide/Graphene (HfO2/Gr) Nanocomposite was successfully synthesized. The crystallinity index and the overall phase transformation process during the synthesis process was observed using x-ray diffraction (XRD) pattern. The surface morphology of the prepared composite was analyzed using Scanning electron microscopy (SEM). Transmission electron microscopy studies (HR-TEM) were conducted to measure the particle sizes. The presence of different types of functional groups was confirmed using FT Raman spectroscopy. UV–Visible spectrum analysis with optical ingestion was conducted to observe the optical properties of the prepared sample. The dielectric properties and conductivity of the prepared sample were investigated whereby the frequencies and the temperatures were altered. The results showed that both the phenomenon of the dielectric consistent and the dielectric loss were frequency and temperature dependent. The thermal conductivity behavior of the prepared samples was checked by calculating AC conductivity values at various temperatures.
Journal of Experimental Nanoscience, 2018
In this research, a one step, facile route has been undertaken to synthesise copper oxide/reduced... more In this research, a one step, facile route has been undertaken to synthesise copper oxide/reduced graphene oxide (CuO/rGO) nanocomposites. X-ray powder diffraction analysis (XRD) was carried out to identity the crystalline structure and phase of the synthesised sample. Elemental analysis and surface morphological features were analysed using EDX and FESEM Images. Particle size as well as the shape of the as prepared composite was observed from HR-TEM images. Raman spectra illustrated the peak of the individual composite materials. The electrochemical properties of the prepared nanocomposite were investigated. The dielectric behaviour of the sample including dielectric constant, dielectric loss and AC conductivity was measured at various frequency levels. Temperature was varied accordingly to observe the effect of temperature on the dielectric properties of the sample.
Nanoscale research letters, Jan 3, 2018
In this research, a facile co-precipitation method was used to synthesize pure and Mg-doped ZnO n... more In this research, a facile co-precipitation method was used to synthesize pure and Mg-doped ZnO nanoparticles (NPs). The structure, morphology, chemical composition, and optical and antibacterial activity of the synthesized nanoparticles (NPs) were studied with respect to pure and Mg-doped ZnO concentrations (0-7.5 molar (M) %). X-ray diffraction pattern confirmed the presence of crystalline, hexagonal wurtzite phase of ZnO. Scanning electron microscope (SEM) images revealed that pure and Mg-doped ZnO NPs were in the nanoscale regime with hexagonal crystalline morphology around 30-110 nm. Optical characterization of the sample revealed that the band gap energy (E) decreased from 3.36 to 3.04 eV with an increase in Mg doping concentration. Optical absorption spectrum of ZnO redshifted as the Mg concentration varied from 2.5 to 7.5 M. Photoluminescence (PL) spectra showed UV emission peak around 400 nm. Enhanced visible emission between 430 and 600 nm with Mg doping indicated the defe...
공동 추계학술발표회 (2000 …, 2011
... 발행정보, 공동 추계학술발표회(2000~) , 2011 권 , 단일호 , Startpage 227 , Endpage 228 , Totalpage 2. - 저자, ( R... more ... 발행정보, 공동 추계학술발표회(2000~) , 2011 권 , 단일호 , Startpage 227 , Endpage 228 , Totalpage 2. - 저자, ( Rahman Rafique ) , ( Prajwal Shrestha ) , ( Guntae Son ) , ( Je Yeon Moon ) , (Sohan Shrestha ) , ( Won Tae Lee ) , ( Seung Hwan Lee ). - 가격, 1,000 원. ...
Desalination, 2003
The feasibility of micellar-enhanced ultrafiltration to remove nutrients, nitrate and phosphate, ... more The feasibility of micellar-enhanced ultrafiltration to remove nutrients, nitrate and phosphate, was investigated with a cationic surfactant, cetlypyridmium chloride (CPC). The effects of surfactant molar ratios on the rejection of nitrate and phosphate and flux decline were studied. In the nitrate/phosphate/CPC system, as the molar ratio of nitrate: phosphate :
Materials Research Express, 2018
Recently extraordinary breakthroughs have been made towards applying nano-structured materials su... more Recently extraordinary breakthroughs have been made towards applying nano-structured materials such as carbon nanotubes (CNTs) and porous graphene membranes in water purification and desalination applications. In this regard, the potential of the electrochemically active carbon nanotube (CNTs) membrane has been highly strengthened for the last few decades. One of the main advantages for such approach is the capability of CNT channel to permit the water flow easily. The perusal of the literature showed that, the performance of CNT based membrane can be three times higher than that of the conventional membrane devices. The unique and excellent characteristics of CNT membrane can outperform the conventional polymer membranes. CNT membrane has been widely used to adsorb chemical and biological contaminants as well as ion separation from sea water due to their high stability, great flexibility, and large specific surface area. Electrochemically active CNT filters deliver further Electro-oxidation of the adsorbed contaminants. Usually polymeric membranes have flexible chains for which it fails to have well-defined pores necessary for filtration. On the contrary CNTs based filters can provide pores with appropriate sizes and configurations by tailoring the growth parameters. The narrow pores of CNTs are capable of filtering water while eliminating ions (Na+/Cl-). Even this type of membranes is capable of removing bacteria from water and heavy hydrocarbon from petroleum. However, the success of desalination entirely depends on the basic design of the CNT-based filter with detailed optimization of the process parameters. Polymer filters cannot be recurrently used through several cycles since elimination of fouling ingredients is difficult. Even though electrochemically active CNT-based membranes have lot of advantages due to their hydrophobic nature, high porosity and specific area; there are numerous traits, which are yet to be considered and optimized. Thus the intrinsic p
International Journal of Electrochemical Science, 2018
Cu 2 CdSnS 4 (CCTS) quaternary alloy nanostructure is an important material of enhancing the sens... more Cu 2 CdSnS 4 (CCTS) quaternary alloy nanostructure is an important material of enhancing the sensors effectiveness. CCTS nanostructures have been synthesized using ultrasonic and deposited on SiO 2 /Si substrate using sol-gel method and under annealing temperature; 400 o C. Structural optical, topographical and morphological properties of CCTS were explored using Ultraviolet-visible spectroscopy, X-ray diffraction (XRD), atomic force microscopy (AFM) and scanning electron microscopy (SEM), respectively. Interdigitated electrodes (IDEs) have been manufactured via deposited silver on CCTS/SiO 2 /Si substrate via a physical vapor deposition and hard mask. Electrical properties of fabricated IDEs are further evaluated as a function of voltage and frequency. The proposed IDEs can be used in subsequent studies to develop a biological sensor capable of detecting the DNA for many types of diseases in order to facilitate the combating and eradicating. The resulted values are in agreement with others.
Materials Research Express, 2018
A facile one-step hydrothermal synthesis of Hafnium oxide/Graphene (HfO2/Gr) Nanocomposite was su... more A facile one-step hydrothermal synthesis of Hafnium oxide/Graphene (HfO2/Gr) Nanocomposite was successfully synthesized. The crystallinity index and the overall phase transformation process during the synthesis process was observed using x-ray diffraction (XRD) pattern. The surface morphology of the prepared composite was analyzed using Scanning electron microscopy (SEM). Transmission electron microscopy studies (HR-TEM) were conducted to measure the particle sizes. The presence of different types of functional groups was confirmed using FT Raman spectroscopy. UV–Visible spectrum analysis with optical ingestion was conducted to observe the optical properties of the prepared sample. The dielectric properties and conductivity of the prepared sample were investigated whereby the frequencies and the temperatures were altered. The results showed that both the phenomenon of the dielectric consistent and the dielectric loss were frequency and temperature dependent. The thermal conductivity behavior of the prepared samples was checked by calculating AC conductivity values at various temperatures.
Journal of Experimental Nanoscience, 2018
In this research, a one step, facile route has been undertaken to synthesise copper oxide/reduced... more In this research, a one step, facile route has been undertaken to synthesise copper oxide/reduced graphene oxide (CuO/rGO) nanocomposites. X-ray powder diffraction analysis (XRD) was carried out to identity the crystalline structure and phase of the synthesised sample. Elemental analysis and surface morphological features were analysed using EDX and FESEM Images. Particle size as well as the shape of the as prepared composite was observed from HR-TEM images. Raman spectra illustrated the peak of the individual composite materials. The electrochemical properties of the prepared nanocomposite were investigated. The dielectric behaviour of the sample including dielectric constant, dielectric loss and AC conductivity was measured at various frequency levels. Temperature was varied accordingly to observe the effect of temperature on the dielectric properties of the sample.
Nanoscale research letters, Jan 3, 2018
In this research, a facile co-precipitation method was used to synthesize pure and Mg-doped ZnO n... more In this research, a facile co-precipitation method was used to synthesize pure and Mg-doped ZnO nanoparticles (NPs). The structure, morphology, chemical composition, and optical and antibacterial activity of the synthesized nanoparticles (NPs) were studied with respect to pure and Mg-doped ZnO concentrations (0-7.5 molar (M) %). X-ray diffraction pattern confirmed the presence of crystalline, hexagonal wurtzite phase of ZnO. Scanning electron microscope (SEM) images revealed that pure and Mg-doped ZnO NPs were in the nanoscale regime with hexagonal crystalline morphology around 30-110 nm. Optical characterization of the sample revealed that the band gap energy (E) decreased from 3.36 to 3.04 eV with an increase in Mg doping concentration. Optical absorption spectrum of ZnO redshifted as the Mg concentration varied from 2.5 to 7.5 M. Photoluminescence (PL) spectra showed UV emission peak around 400 nm. Enhanced visible emission between 430 and 600 nm with Mg doping indicated the defe...
PloS one, 2018
A cost-effective, facile hydrothermal approach was made for the synthesis of SnO2/graphene (Gr) n... more A cost-effective, facile hydrothermal approach was made for the synthesis of SnO2/graphene (Gr) nano-composites. XRD diffraction spectra clearly confirmed the presence of tetragonal crystal system of SnO2 which was maintaining its structure in both pure and composite materials' matrix. The stretching and bending vibrations of the functional groups were analyzed using FTIR analysis. FESEM images illustrated the surface morphology and the texture of the synthesized sample. HRTEM images confirmed the deposition of SnO2 nanoparticles over the surface of graphene nano-sheets. Raman Spectroscopic analysis was carried out to confirm the in-plane blending of SnO2 and graphene inside the composite matrix. The photocatalytic performance of the synthesized sample under UV irradiation using methylene blue dye was observed. Incorporation of grapheme into the SnO2 sample had increased the photocatalytic activity compared with the pure SnO2 sample. The electrochemical property of the synthesiz...
Author is alumni of both Asian Institute of Technology (AIT), Thailand & University of Dhaka, Ban... more Author is alumni of both Asian Institute of Technology (AIT), Thailand & University of Dhaka, Bangladesh. This book is a study of a partial fulfillment of the requirements for the degree of Master of Science and it is the determination of the level of Benzene, Toluene, Ethylbenzene & Xylenes (BTEX) inside and outside environment of a Petroleum Refinery Industry. BTEX expose to the atmosphere due to the refinery operations of petrochemicals occurred in industry. BTEX vapors are corrosive and toxic substance and can also pose drinking water hazard as they accumulate in ground water. They often stick together in contaminated site and they are more harmful to human than the non-human living things whereas Benzene alone is a well-known human carcinogen. Prolonged exposure to these compounds has harmful effects on kidney, liver and blood systems. The study was conducted in a refinery industry collecting samples from various sites and they were analyzed in modern Gas Chromatographic (GC-TD...
The modern evolution in nanotechnology has brought about a revolutionary trend in developing nove... more The modern evolution in nanotechnology has brought about a revolutionary trend in developing novel biomaterials with superior properties and functionalities for targeted biomedical applications including pharmaceutical applications in biomedicine. There has been a steadily increasing interest in using nanoparticles in biomedical applications such as targeted drug delivery, hyperthermia, photoablation therapy, biosensors, bioimaging, cell labeling, and gene delivery over the past few years. Their exceptional properties such as chemical stability, nontoxicity, biocompatibility, high saturation magnetization, and high magnetic susceptibility, metallic nanoparticles like silver (Ag) and gold (Au), bimetallic nanoparticles like iron cobalt (Fe–Co) and iron platinum (Fe–Pt), and metal oxides including titanium dioxide (TiO2), silica (SiO2), cerium dioxide (CeO2), and zinc oxide (ZnO), and especially the less studied nanoparticles such as silver (Ag), iron platinum (Fe–Pt), and titanium di...
* The NJIT Honor Code will be upheld, and any violations will be brought to the immediate attenti... more * The NJIT Honor Code will be upheld, and any violations will be brought to the immediate attention of the Dean of Students. * Students will be consulted with by the instructor and must agree to any modifications or deviations from the syllabus throughout the course of the semester.
Green Chemistry and Sustainable Technology, 2021
Emerging Technologies for Sustainable Desalination Handbook, 2018
Abstract Recently, extraordinary breakthroughs have been made toward applying nanostructured mate... more Abstract Recently, extraordinary breakthroughs have been made toward applying nanostructured materials such as carbon nanotubes (CNTs), porous graphene membranes in water purification, and desalination applications. In this regard, the potential of the electrochemically active CNT membrane has been highly strengthened for the last few decades. One of the main advantages of such approach is the capability of CNT channel to permit the water flow easily. The perusal of the literature showed that the performance of CNT-based membrane can be three times higher than that of the conventional membrane devices. The unique and excellent characteristics of CNT membrane can outperform the conventional polymer membranes. The CNT membrane has been widely used to adsorb chemical and biological contaminants as well as ion separation from seawater due to their high stability, great flexibility, and large specific surface area. Electrochemically active CNT filters deliver further electrooxidation of the adsorbed contaminants. Usually, polymeric membranes have flexible chains for which it fails to have well-defined pores necessary for filtration. On the contrary, CNT-based filters can provide pores with appropriate sizes and configurations by tailoring the growth parameters. The narrow pores of CNTs are capable of filtering water while eliminating ions (Na+/Cl−). Even this type of membrane is capable of removing bacteria from water and heavy hydrocarbon from petroleum. However, the success of desalination entirely depends on the basic design of the CNT-based filter with detailed optimization of the process parameters. Polymer filters cannot be recurrently used through several cycles since the elimination of fouling ingredients is difficult. Even though electrochemically active CNT-based membranes have lot of advantages due to their hydrophobic nature, high porosity and specific area; there are numerous traits, which are yet to be considered and optimized. Thus, the intrinsic properties of CNT and the fabrication of the membrane could be critical factors for their applicability in various water treatment processes. This chapter provides an explicit and systematic overview of the recent progress of electrochemically active CNT membranes addressing the current prevalent problems associated with water treatment and desalination. The physiochemical aspect including the working principles of this type of membrane have been discussed. The prevailing challenges and future perceptions are also discussed.
Pyrolysis, 2017
Lignocellulosic biomass is a potentially more valuable renewable resource that can be utilized ef... more Lignocellulosic biomass is a potentially more valuable renewable resource that can be utilized effusively as a chief source of heat for cooking and can correspondingly subsidize the production of electricity, heat, biofuels and chemicals including solid fuel like char or carbon. Lignocellulosic residues are mixed and burnt with coal to generate electricity. Presently, crude oil is replaced by bioethanol and biodiesel produced from biomass substrate. Some special class of chemicals can be derived from biomass that can subsequently replace the usage of non-renewable resources of oil and coal. Pyrolysis of woody biomass to obtain pyroliginous acid was started hundreds of years ago, which has versatile applications. The range of products that can be derived from biomass is huge, prompting extent of research using different types of thermal conversion technologies, including pyrolysis, gasification, torrefaction, anaerobic digestion and hydrothermal processing. This chapter provides insights about the stages of reaction during pyrolysis and the outcome of reaction conditions on the products. Technical development and adjustment of process condition can offer a suitable environmentally benign scheme to increase the energy density of the lignocellulosic residues.
Materials Research Express, 2018
Recently extraordinary breakthroughs have been made towards applying nano-structured materials su... more Recently extraordinary breakthroughs have been made towards applying nano-structured materials such as carbon nanotubes (CNTs) and porous graphene membranes in water purification and desalination applications. In this regard, the potential of the electrochemically active carbon nanotube (CNTs) membrane has been highly strengthened for the last few decades. One of the main advantages for such approach is the capability of CNT channel to permit the water flow easily. The perusal of the literature showed that, the performance of CNT based membrane can be three times higher than that of the conventional membrane devices. The unique and excellent characteristics of CNT membrane can outperform the conventional polymer membranes. CNT membrane has been widely used to adsorb chemical and biological contaminants as well as ion separation from sea water due to their high stability, great flexibility, and large specific surface area. Electrochemically active CNT filters deliver further Electro-oxidation of the adsorbed contaminants. Usually polymeric membranes have flexible chains for which it fails to have well-defined pores necessary for filtration. On the contrary CNTs based filters can provide pores with appropriate sizes and configurations by tailoring the growth parameters. The narrow pores of CNTs are capable of filtering water while eliminating ions (Na+/Cl-). Even this type of membranes is capable of removing bacteria from water and heavy hydrocarbon from petroleum. However, the success of desalination entirely depends on the basic design of the CNT-based filter with detailed optimization of the process parameters. Polymer filters cannot be recurrently used through several cycles since elimination of fouling ingredients is difficult. Even though electrochemically active CNT-based membranes have lot of advantages due to their hydrophobic nature, high porosity and specific area; there are numerous traits, which are yet to be considered and optimized. Thus the intrinsic p
International Journal of Electrochemical Science, 2018
Cu 2 CdSnS 4 (CCTS) quaternary alloy nanostructure is an important material of enhancing the sens... more Cu 2 CdSnS 4 (CCTS) quaternary alloy nanostructure is an important material of enhancing the sensors effectiveness. CCTS nanostructures have been synthesized using ultrasonic and deposited on SiO 2 /Si substrate using sol-gel method and under annealing temperature; 400 o C. Structural optical, topographical and morphological properties of CCTS were explored using Ultraviolet-visible spectroscopy, X-ray diffraction (XRD), atomic force microscopy (AFM) and scanning electron microscopy (SEM), respectively. Interdigitated electrodes (IDEs) have been manufactured via deposited silver on CCTS/SiO 2 /Si substrate via a physical vapor deposition and hard mask. Electrical properties of fabricated IDEs are further evaluated as a function of voltage and frequency. The proposed IDEs can be used in subsequent studies to develop a biological sensor capable of detecting the DNA for many types of diseases in order to facilitate the combating and eradicating. The resulted values are in agreement with others.
Materials Research Express, 2018
A facile one-step hydrothermal synthesis of Hafnium oxide/Graphene (HfO2/Gr) Nanocomposite was su... more A facile one-step hydrothermal synthesis of Hafnium oxide/Graphene (HfO2/Gr) Nanocomposite was successfully synthesized. The crystallinity index and the overall phase transformation process during the synthesis process was observed using x-ray diffraction (XRD) pattern. The surface morphology of the prepared composite was analyzed using Scanning electron microscopy (SEM). Transmission electron microscopy studies (HR-TEM) were conducted to measure the particle sizes. The presence of different types of functional groups was confirmed using FT Raman spectroscopy. UV–Visible spectrum analysis with optical ingestion was conducted to observe the optical properties of the prepared sample. The dielectric properties and conductivity of the prepared sample were investigated whereby the frequencies and the temperatures were altered. The results showed that both the phenomenon of the dielectric consistent and the dielectric loss were frequency and temperature dependent. The thermal conductivity behavior of the prepared samples was checked by calculating AC conductivity values at various temperatures.
Journal of Experimental Nanoscience, 2018
In this research, a one step, facile route has been undertaken to synthesise copper oxide/reduced... more In this research, a one step, facile route has been undertaken to synthesise copper oxide/reduced graphene oxide (CuO/rGO) nanocomposites. X-ray powder diffraction analysis (XRD) was carried out to identity the crystalline structure and phase of the synthesised sample. Elemental analysis and surface morphological features were analysed using EDX and FESEM Images. Particle size as well as the shape of the as prepared composite was observed from HR-TEM images. Raman spectra illustrated the peak of the individual composite materials. The electrochemical properties of the prepared nanocomposite were investigated. The dielectric behaviour of the sample including dielectric constant, dielectric loss and AC conductivity was measured at various frequency levels. Temperature was varied accordingly to observe the effect of temperature on the dielectric properties of the sample.
Nanoscale research letters, Jan 3, 2018
In this research, a facile co-precipitation method was used to synthesize pure and Mg-doped ZnO n... more In this research, a facile co-precipitation method was used to synthesize pure and Mg-doped ZnO nanoparticles (NPs). The structure, morphology, chemical composition, and optical and antibacterial activity of the synthesized nanoparticles (NPs) were studied with respect to pure and Mg-doped ZnO concentrations (0-7.5 molar (M) %). X-ray diffraction pattern confirmed the presence of crystalline, hexagonal wurtzite phase of ZnO. Scanning electron microscope (SEM) images revealed that pure and Mg-doped ZnO NPs were in the nanoscale regime with hexagonal crystalline morphology around 30-110 nm. Optical characterization of the sample revealed that the band gap energy (E) decreased from 3.36 to 3.04 eV with an increase in Mg doping concentration. Optical absorption spectrum of ZnO redshifted as the Mg concentration varied from 2.5 to 7.5 M. Photoluminescence (PL) spectra showed UV emission peak around 400 nm. Enhanced visible emission between 430 and 600 nm with Mg doping indicated the defe...