rosari saleh | Universitas Indonesia 5 (original) (raw)

Papers by rosari saleh

Journal of physics, 2020

Use of carbon-based materials, such as graphene, has drawn attention in the wastewater treatment ... more Use of carbon-based materials, such as graphene, has drawn attention in the wastewater treatment field because of their high specific surface area. This property of graphene suggested that it had superior adsorption characteristics for removing contaminant dyes from aqueous solutions. Based on this precept, we wanted to enhance the adsorption ability of the Ag/Fe3O4/ZrO2 photocatalyst by adding graphene, using the co-precipitation method for synthesis. The crystal structure of as-prepared specimen was characterized using Xray diffraction, which confirmed the existence of tetragonal phase ZrO2, cubic spinel phase Fe3O4 and cubic phase Ag. Unfortunately, the graphene characteristic peak could not be detected by X-ray diffraction (XRD). Thermal gravimetric analysis showed that mass degradation below 150 °C could be attributed to the loss of bound water from the surface of the ZrO2. Mass degradation at 340 °C could be attributed to the combustion process of graphene, which indicated the presence of graphene in the prepared samples. The synthesized samples were utilized for the uptake of methylene blue (MB) as a model of an organic pollutant. The results that were obtained showed that the inclusion of graphene increased the ability of Fe3O4/ZrO2 adsorption. Increases in the weight percentage of graphene increased the adsorption ability of the samples. The best adsorption occurred in alkaline pH conditions. The experimental data could be fitted better using the Langmuir model than it could using the Freundlich model. Finally, as-prepared samples showed good stability, even after four cycles of reuse.

Nucleation and Atmospheric Aerosols, 2018

The LaMnO3/graphene composites have been successfully synthesized using co-precipitation method a... more The LaMnO3/graphene composites have been successfully synthesized using co-precipitation method at five different calcination temperature of LaMnO3 nanoparticles (untreated, 500°C, 600℃, 700°C, and 800°C.The effects of calcination temperature on the formation of LaMnO3 nanoparticles on LaMnO3/graphene were investigated. The average grain size of LaMnO3/graphene increases with increasing calcination temperature on LaMnO3 nanoparticles. The use of calcination can effectively reduce the crystallization of LaMnO3 nanoparticles on LaMnO3/graphene composites. LaMnO3/graphene shows the orthorhombic structure of LaMnO3 nanoparticles while the peak of graphene cannot be identified owing to graphene's broad peak. The LaMnO3 nanoparticles obtained at a calcination temperature of 800 °C exhibits superior adsorption to remove methylene blue. Furthermore, the adsorption test of methylene blue using LaMnO3/graphene follows a pseudo-second order kinetic process and Langmuir model.

Nucleation and Atmospheric Aerosols, 2018

In this study, the adsorption capability of Fe3O4/ZrO2 composites, synthesized using co-precipita... more In this study, the adsorption capability of Fe3O4/ZrO2 composites, synthesized using co-precipitation method, has been studied with the addition of nanographene platelets (NGP) and graphene. The as-prepared samples were fairly characterized using X-ray diffraction, energy dispersive x-ray spectroscopy, and a vibrating sample magnetometer. The asprepared samples were used for uptake of methylene blue (MB) used as a model of an organic pollutant. The obtained results show that the incorporation of NGP and graphene increases the adsorption capability of Fe3O4/ZrO2, and the addition of graphene enhanced the adsorption ability of Fe3O4/ZrO2 to a higher degree compared to NGP, in the removal of MB from the aqueous solution. We also studied the effect of pH, adsorption isotherms, and reusability of the as-prepared samples on the MB removal.

IOP conference series, May 1, 2017

Nucleation and Atmospheric Aerosols, 2018

Materials Sciences and Applications, 2013

Ce-doped ZnO nanoparticles with various doping concentrations of cerium ion were prepared by the ... more Ce-doped ZnO nanoparticles with various doping concentrations of cerium ion were prepared by the co-precipitation method. All prepared nanoparticles were characterized by electron spin resonance (ESR), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) and UV-Vis diffuse reflectance spectroscopy. All nanoparticles show X-ray diffraction pattern that matched with ZnO in its wurzite structure and average grain size was in the range of 13-16 nm. UV-Vis measurements indicated a red shift of the photophysical response of ZnO after doping that was exhibited in reflection spectra in the visible region between 300-800 nm. In addition, it has been found from electron spin resonance measurements that defects, which are likely to be oxygen vacancy and an electron trapped at cerium site are formed in our Ce-doped ZnO particles. Photocatalytic activities of Ce-doped ZnO were evaluated by irradiating the nanoparticles solution to ultraviolet light by taking methyl orange as organic dye. The experiment demonstrated that the photodegradation increased as doping concentrations increased at first and then decreased when the doping concentration exceeded 9 at%. It is proposed that the photocatalytic activity is strongly dependent on the formation of oxygen vacancy and an electron trapped at cerium site.

Journal of physics, 2021

In this work, a novel quaternary composite, Ag/Fe3O4/ZrO2/NGP and Ag/Fe3O4/ZrO2/graphene, as high... more In this work, a novel quaternary composite, Ag/Fe3O4/ZrO2/NGP and Ag/Fe3O4/ZrO2/graphene, as highly efficient catalysts were prepared through ultrasonic-assisted and co-precipitation methods. The prepared composite was characterized by X-ray diffraction (XRD), thermal gravimetric analysis (TGA) and vibrating sample magnetometer (VSM). The photo- and sonocatalytic activity of prepared composite were studied through the degradation of methylene blue (MB) as a model of organic pollutant under UV light and ultrasonic irradiation, separately. The experimental results showed that the composite contained a combination of the desired nanoparticles. In the catalytic activity, Ag/Fe3O4/ZrO2/graphene exhibited much higher efficiency than Ag/Fe3O4/ZrO2/NGP and Ag/Fe3O4/ZrO2 composite. Furthermore, the influence catalyst dosage was studied. To understand the role of reactive species in the sonocatalytic activity, several scavengers were tested. The reusability study suggested that the prepared composite remain stable even after four cycles reused.

Journal of Biophysical Chemistry, 2011

In this present study, we predicted the neutralizing epitope of a modeled H5N1 hemagglutinin 1046... more In this present study, we predicted the neutralizing epitope of a modeled H5N1 hemagglutinin 1046T when interacted with a modeled monoclonal antibody variable fragment 8H5Fv using molecular dynamics simulation. Following the production run of the molecular dynamics simulation, we observed the average change of solvent accessible surface of the antigen alongside the formation of hydrogen bonds between the two structures during the simulation. Based on the acquired data, we predicted the neutralizing epitope of the 1046T antigen to be consisted of residues Asp 84,

Nucleation and Atmospheric Aerosols, 2017

ZnO/CeO2 photocatalysts were loaded on to nanographene platelets (NGP) layer sheets to form ZnO/C... more ZnO/CeO2 photocatalysts were loaded on to nanographene platelets (NGP) layer sheets to form ZnO/CeO2/NGP composites. The synthesized process was achieved by using two-step methods: Sol-gel followed by the hydrothermal method, the concentration of NGP was varied by 5, 10, and 15 wt.%. The as-prepared ZnO/CeO2/NGP samples were characterized by X-ray diffraction (XRD) and Brunner Emett-Teller (BET). The XRD spectra of all samples exhibit a good agreement with hexagonal wurtzite ZnO and face centered cubic phase of CeO2, additionally a new peak could be indexed for graphitic-like structures from NGP. The BET result shows that the incorporation of NGP could enhance the specific surface area of ZnO/CeO2 composites. Furthermore, it is found that addition of NGP in ZnO/CeO2 composites could enhance photocatalytic activities in methylene blue (MB) dye degradation compared to ZnO/CeO2 composites. Our results show that addition of 10 wt.% NGP to ZnO/CeO2 composites exhibits the highest photocatalytic activity. The enhancement of photocatalytic activities can be ascribed to the function of NGP as trap state for the electron. The scavenger tests results indicated that the photo-generated hole would play an important role in the degradation of MB.

Journal of physics, Apr 1, 2016

To cite this article: Abdel-Ghany F. Shoair (2007) Synthesis, characterization and catalytic prop... more To cite this article: Abdel-Ghany F. Shoair (2007) Synthesis, characterization and catalytic properties of ruthenium(III) complexes containing 4-hydroxy-3-(p-X-phenylazo)-benzopyrane-2one,

Advanced Powder Technology

IOP Conference Series: Materials Science and Engineering, 2017

IOP Conference Series: Materials Science and Engineering, 2017

IOP Conference Series: Materials Science and Engineering, 2017

In this work LaMnO3-NGP composites with various NGP wt. % were prepared using co-precipitation me... more In this work LaMnO3-NGP composites with various NGP wt. % were prepared using co-precipitation method. The prepared LaMnO3-NGP composites were characterized by X-Ray Diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area analysis, and Fourier Transform Infrared (FT-IR) spectroscopy. The prepared samples were then used to remove methylene blue (MB) as a model of an organic pollutant under visible light and ultrasonic irradiation separately and simultaneously. The obtained results revealed that the catalytic performance of LaMnO3-NGP composites show better performance than LaMnO3 nanoparticles. The photosonocatalytic activity also shows the highest degradation efficiency. Furthermore, the main influence factors on the catalytic activity were studied and discussed.

IOP Conference Series: Materials Science and Engineering, 2017

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licenc... more Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

IOP Conference Series: Materials Science and Engineering, 2017

View the article online for updates and enhancements. You may also like Preparation at large-scal... more View the article online for updates and enhancements. You may also like Preparation at large-scale of polypropylene nanocomposites with microwaves reduced graphene oxide M G Iniestra-Galindo, J Pérez-González, B M Marín-Santibáñez et al.

IOP Conference Series: Materials Science and Engineering, 2017

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licenc... more Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

Journal of Physics: Conference Series, 2017

An Ag/Ag2O/TiO2/NGP with different nanographene platelets (NGP) weight percents was synthesized u... more An Ag/Ag2O/TiO2/NGP with different nanographene platelets (NGP) weight percents was synthesized using the hydrothermal method. The NGP weight percent was 5, 10, and 15 weight percent, respectively. The structural properties of the samples were characterized by X-ray diffraction. The optical properties of the samples were investigated by UV-Vis spectroscopy and their thermal properties were investigated by Thermo Gravimetric Analysis and Differential Thermal Analysis. The existence of a cubic structure from Ag and Ag2O, an anatase from TiO2, and a graphitic like structure from NGP indicated that the samples were successfully formed. The maximum light absorption at 435 nm indicated the existence of surface plasmon resonance (SPR) from silver nanoparticles. The phase transformation of Ag2O to Ag occurred at 435 °C. Adsorption and the photocatalytic performance were investigated in the degradation of methylene blue from the aqueous solution. The adsorption ability of Ag/Ag2O/TiO2/NGP co...

Journal of Physics: Conference Series, 2017

In this work, Fe-doped zinc oxide/natural zeolite (Fe:ZnO/NZ) nanocomposites were prepared using ... more In this work, Fe-doped zinc oxide/natural zeolite (Fe:ZnO/NZ) nanocomposites were prepared using the co-precipitation method with various NZ amounts. The nanocomposites were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area analysis and thermogravimetric analysis (TGA). The nanocomposites were used to remove methylene blue (MB) dye from an aqueous solution. The effect of various NZ amounts and initial MB concentration were tested. The Pseudo-first-order and pseudo-second-order kinetic models were used to explain the adsorption mechanism. The Langmuir and the Freundlich isotherm models were used to fit the adsorption isotherms of the nanocomposites.

Journal of Physics: Conference Series, 2017

This study added different types of graphene (GN-1 and GN-2) in to LaMnO3/Fe3O4 nanocomposite to ... more This study added different types of graphene (GN-1 and GN-2) in to LaMnO3/Fe3O4 nanocomposite to degrade MB as an organic pollutant. LaMnO3/Fe3O4/GN-1 and LaMnO3/Fe3O4/GN-2 composites were synthesized using the co-precipitation method in a constant 5 wt% of GN. The as-prepared samples were characterized using XRD and TGA. The LaMnO3/Fe3O4/GN-1 and LaMnO3/Fe3O4/GN-2 composites showed the orthorhombic structure of LaMnO3 nanoparticles and the cubic spinel of Fe3O4 nanoparticles, as well as of GN-1 and GN-2. The graphite structure of NGP in LaMnO3/Fe3O4/GN-1 composites was confirmed. However, the peak of graphene in LaMnO3/Fe3O4/GN-2 could not be identified. The photocatalytic efficiency of the LaMnO3/Fe3O4/GN-2 was higher than that of LaMnO3/Fe3O4/GN-1. The enhancement of the photocatalytic light activity can be attributed to the high separation efficiency of electron-hole recombination and to the large surface contact between LaMnO3/Fe3O4 and graphene, which can improve the transfer efficiency of the photocatalytic process. In addition, the effects of catalyst dosage, rate constant, and scavengers were investigated and discussed.

Journal of physics, 2020

Use of carbon-based materials, such as graphene, has drawn attention in the wastewater treatment ... more Use of carbon-based materials, such as graphene, has drawn attention in the wastewater treatment field because of their high specific surface area. This property of graphene suggested that it had superior adsorption characteristics for removing contaminant dyes from aqueous solutions. Based on this precept, we wanted to enhance the adsorption ability of the Ag/Fe3O4/ZrO2 photocatalyst by adding graphene, using the co-precipitation method for synthesis. The crystal structure of as-prepared specimen was characterized using Xray diffraction, which confirmed the existence of tetragonal phase ZrO2, cubic spinel phase Fe3O4 and cubic phase Ag. Unfortunately, the graphene characteristic peak could not be detected by X-ray diffraction (XRD). Thermal gravimetric analysis showed that mass degradation below 150 °C could be attributed to the loss of bound water from the surface of the ZrO2. Mass degradation at 340 °C could be attributed to the combustion process of graphene, which indicated the presence of graphene in the prepared samples. The synthesized samples were utilized for the uptake of methylene blue (MB) as a model of an organic pollutant. The results that were obtained showed that the inclusion of graphene increased the ability of Fe3O4/ZrO2 adsorption. Increases in the weight percentage of graphene increased the adsorption ability of the samples. The best adsorption occurred in alkaline pH conditions. The experimental data could be fitted better using the Langmuir model than it could using the Freundlich model. Finally, as-prepared samples showed good stability, even after four cycles of reuse.

Nucleation and Atmospheric Aerosols, 2018

The LaMnO3/graphene composites have been successfully synthesized using co-precipitation method a... more The LaMnO3/graphene composites have been successfully synthesized using co-precipitation method at five different calcination temperature of LaMnO3 nanoparticles (untreated, 500°C, 600℃, 700°C, and 800°C.The effects of calcination temperature on the formation of LaMnO3 nanoparticles on LaMnO3/graphene were investigated. The average grain size of LaMnO3/graphene increases with increasing calcination temperature on LaMnO3 nanoparticles. The use of calcination can effectively reduce the crystallization of LaMnO3 nanoparticles on LaMnO3/graphene composites. LaMnO3/graphene shows the orthorhombic structure of LaMnO3 nanoparticles while the peak of graphene cannot be identified owing to graphene's broad peak. The LaMnO3 nanoparticles obtained at a calcination temperature of 800 °C exhibits superior adsorption to remove methylene blue. Furthermore, the adsorption test of methylene blue using LaMnO3/graphene follows a pseudo-second order kinetic process and Langmuir model.

Nucleation and Atmospheric Aerosols, 2018

In this study, the adsorption capability of Fe3O4/ZrO2 composites, synthesized using co-precipita... more In this study, the adsorption capability of Fe3O4/ZrO2 composites, synthesized using co-precipitation method, has been studied with the addition of nanographene platelets (NGP) and graphene. The as-prepared samples were fairly characterized using X-ray diffraction, energy dispersive x-ray spectroscopy, and a vibrating sample magnetometer. The asprepared samples were used for uptake of methylene blue (MB) used as a model of an organic pollutant. The obtained results show that the incorporation of NGP and graphene increases the adsorption capability of Fe3O4/ZrO2, and the addition of graphene enhanced the adsorption ability of Fe3O4/ZrO2 to a higher degree compared to NGP, in the removal of MB from the aqueous solution. We also studied the effect of pH, adsorption isotherms, and reusability of the as-prepared samples on the MB removal.

IOP conference series, May 1, 2017

Nucleation and Atmospheric Aerosols, 2018

Materials Sciences and Applications, 2013

Ce-doped ZnO nanoparticles with various doping concentrations of cerium ion were prepared by the ... more Ce-doped ZnO nanoparticles with various doping concentrations of cerium ion were prepared by the co-precipitation method. All prepared nanoparticles were characterized by electron spin resonance (ESR), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) and UV-Vis diffuse reflectance spectroscopy. All nanoparticles show X-ray diffraction pattern that matched with ZnO in its wurzite structure and average grain size was in the range of 13-16 nm. UV-Vis measurements indicated a red shift of the photophysical response of ZnO after doping that was exhibited in reflection spectra in the visible region between 300-800 nm. In addition, it has been found from electron spin resonance measurements that defects, which are likely to be oxygen vacancy and an electron trapped at cerium site are formed in our Ce-doped ZnO particles. Photocatalytic activities of Ce-doped ZnO were evaluated by irradiating the nanoparticles solution to ultraviolet light by taking methyl orange as organic dye. The experiment demonstrated that the photodegradation increased as doping concentrations increased at first and then decreased when the doping concentration exceeded 9 at%. It is proposed that the photocatalytic activity is strongly dependent on the formation of oxygen vacancy and an electron trapped at cerium site.

Journal of physics, 2021

In this work, a novel quaternary composite, Ag/Fe3O4/ZrO2/NGP and Ag/Fe3O4/ZrO2/graphene, as high... more In this work, a novel quaternary composite, Ag/Fe3O4/ZrO2/NGP and Ag/Fe3O4/ZrO2/graphene, as highly efficient catalysts were prepared through ultrasonic-assisted and co-precipitation methods. The prepared composite was characterized by X-ray diffraction (XRD), thermal gravimetric analysis (TGA) and vibrating sample magnetometer (VSM). The photo- and sonocatalytic activity of prepared composite were studied through the degradation of methylene blue (MB) as a model of organic pollutant under UV light and ultrasonic irradiation, separately. The experimental results showed that the composite contained a combination of the desired nanoparticles. In the catalytic activity, Ag/Fe3O4/ZrO2/graphene exhibited much higher efficiency than Ag/Fe3O4/ZrO2/NGP and Ag/Fe3O4/ZrO2 composite. Furthermore, the influence catalyst dosage was studied. To understand the role of reactive species in the sonocatalytic activity, several scavengers were tested. The reusability study suggested that the prepared composite remain stable even after four cycles reused.

Journal of Biophysical Chemistry, 2011

In this present study, we predicted the neutralizing epitope of a modeled H5N1 hemagglutinin 1046... more In this present study, we predicted the neutralizing epitope of a modeled H5N1 hemagglutinin 1046T when interacted with a modeled monoclonal antibody variable fragment 8H5Fv using molecular dynamics simulation. Following the production run of the molecular dynamics simulation, we observed the average change of solvent accessible surface of the antigen alongside the formation of hydrogen bonds between the two structures during the simulation. Based on the acquired data, we predicted the neutralizing epitope of the 1046T antigen to be consisted of residues Asp 84,

Nucleation and Atmospheric Aerosols, 2017

ZnO/CeO2 photocatalysts were loaded on to nanographene platelets (NGP) layer sheets to form ZnO/C... more ZnO/CeO2 photocatalysts were loaded on to nanographene platelets (NGP) layer sheets to form ZnO/CeO2/NGP composites. The synthesized process was achieved by using two-step methods: Sol-gel followed by the hydrothermal method, the concentration of NGP was varied by 5, 10, and 15 wt.%. The as-prepared ZnO/CeO2/NGP samples were characterized by X-ray diffraction (XRD) and Brunner Emett-Teller (BET). The XRD spectra of all samples exhibit a good agreement with hexagonal wurtzite ZnO and face centered cubic phase of CeO2, additionally a new peak could be indexed for graphitic-like structures from NGP. The BET result shows that the incorporation of NGP could enhance the specific surface area of ZnO/CeO2 composites. Furthermore, it is found that addition of NGP in ZnO/CeO2 composites could enhance photocatalytic activities in methylene blue (MB) dye degradation compared to ZnO/CeO2 composites. Our results show that addition of 10 wt.% NGP to ZnO/CeO2 composites exhibits the highest photocatalytic activity. The enhancement of photocatalytic activities can be ascribed to the function of NGP as trap state for the electron. The scavenger tests results indicated that the photo-generated hole would play an important role in the degradation of MB.

Journal of physics, Apr 1, 2016

To cite this article: Abdel-Ghany F. Shoair (2007) Synthesis, characterization and catalytic prop... more To cite this article: Abdel-Ghany F. Shoair (2007) Synthesis, characterization and catalytic properties of ruthenium(III) complexes containing 4-hydroxy-3-(p-X-phenylazo)-benzopyrane-2one,

Advanced Powder Technology

IOP Conference Series: Materials Science and Engineering, 2017

IOP Conference Series: Materials Science and Engineering, 2017

IOP Conference Series: Materials Science and Engineering, 2017

In this work LaMnO3-NGP composites with various NGP wt. % were prepared using co-precipitation me... more In this work LaMnO3-NGP composites with various NGP wt. % were prepared using co-precipitation method. The prepared LaMnO3-NGP composites were characterized by X-Ray Diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area analysis, and Fourier Transform Infrared (FT-IR) spectroscopy. The prepared samples were then used to remove methylene blue (MB) as a model of an organic pollutant under visible light and ultrasonic irradiation separately and simultaneously. The obtained results revealed that the catalytic performance of LaMnO3-NGP composites show better performance than LaMnO3 nanoparticles. The photosonocatalytic activity also shows the highest degradation efficiency. Furthermore, the main influence factors on the catalytic activity were studied and discussed.

IOP Conference Series: Materials Science and Engineering, 2017

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licenc... more Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

IOP Conference Series: Materials Science and Engineering, 2017

View the article online for updates and enhancements. You may also like Preparation at large-scal... more View the article online for updates and enhancements. You may also like Preparation at large-scale of polypropylene nanocomposites with microwaves reduced graphene oxide M G Iniestra-Galindo, J Pérez-González, B M Marín-Santibáñez et al.

IOP Conference Series: Materials Science and Engineering, 2017

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licenc... more Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

Journal of Physics: Conference Series, 2017

An Ag/Ag2O/TiO2/NGP with different nanographene platelets (NGP) weight percents was synthesized u... more An Ag/Ag2O/TiO2/NGP with different nanographene platelets (NGP) weight percents was synthesized using the hydrothermal method. The NGP weight percent was 5, 10, and 15 weight percent, respectively. The structural properties of the samples were characterized by X-ray diffraction. The optical properties of the samples were investigated by UV-Vis spectroscopy and their thermal properties were investigated by Thermo Gravimetric Analysis and Differential Thermal Analysis. The existence of a cubic structure from Ag and Ag2O, an anatase from TiO2, and a graphitic like structure from NGP indicated that the samples were successfully formed. The maximum light absorption at 435 nm indicated the existence of surface plasmon resonance (SPR) from silver nanoparticles. The phase transformation of Ag2O to Ag occurred at 435 °C. Adsorption and the photocatalytic performance were investigated in the degradation of methylene blue from the aqueous solution. The adsorption ability of Ag/Ag2O/TiO2/NGP co...

Journal of Physics: Conference Series, 2017

In this work, Fe-doped zinc oxide/natural zeolite (Fe:ZnO/NZ) nanocomposites were prepared using ... more In this work, Fe-doped zinc oxide/natural zeolite (Fe:ZnO/NZ) nanocomposites were prepared using the co-precipitation method with various NZ amounts. The nanocomposites were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area analysis and thermogravimetric analysis (TGA). The nanocomposites were used to remove methylene blue (MB) dye from an aqueous solution. The effect of various NZ amounts and initial MB concentration were tested. The Pseudo-first-order and pseudo-second-order kinetic models were used to explain the adsorption mechanism. The Langmuir and the Freundlich isotherm models were used to fit the adsorption isotherms of the nanocomposites.

Journal of Physics: Conference Series, 2017

This study added different types of graphene (GN-1 and GN-2) in to LaMnO3/Fe3O4 nanocomposite to ... more This study added different types of graphene (GN-1 and GN-2) in to LaMnO3/Fe3O4 nanocomposite to degrade MB as an organic pollutant. LaMnO3/Fe3O4/GN-1 and LaMnO3/Fe3O4/GN-2 composites were synthesized using the co-precipitation method in a constant 5 wt% of GN. The as-prepared samples were characterized using XRD and TGA. The LaMnO3/Fe3O4/GN-1 and LaMnO3/Fe3O4/GN-2 composites showed the orthorhombic structure of LaMnO3 nanoparticles and the cubic spinel of Fe3O4 nanoparticles, as well as of GN-1 and GN-2. The graphite structure of NGP in LaMnO3/Fe3O4/GN-1 composites was confirmed. However, the peak of graphene in LaMnO3/Fe3O4/GN-2 could not be identified. The photocatalytic efficiency of the LaMnO3/Fe3O4/GN-2 was higher than that of LaMnO3/Fe3O4/GN-1. The enhancement of the photocatalytic light activity can be attributed to the high separation efficiency of electron-hole recombination and to the large surface contact between LaMnO3/Fe3O4 and graphene, which can improve the transfer efficiency of the photocatalytic process. In addition, the effects of catalyst dosage, rate constant, and scavengers were investigated and discussed.