Prasanta Raul - Academia.edu (original) (raw)

Papers by Prasanta Raul

Research paper thumbnail of Removal of Fluoride from Water Using Iron Oxide-Hydroxide Nanoparticles

Journal of Nanoscience and Nanotechnology, 2012

A novel and facile method for the synthesis of uniform stoichiometric powder form of non-magnetic... more A novel and facile method for the synthesis of uniform stoichiometric powder form of non-magnetic iron oxide-hydroxide nanoparticles with spherical morphology and its application for defluoridation of drinking water is reported. X-ray powder diffraction analysis (XRD), BET surface area, FTIR, field emission scanning electron microscopy (FESEM) and Transmission electron microscopy (TEM) images were used to characterize nanoscale iron oxide-hydroxide. Transmission electron microscopy (TEM) image revealed the formation of iron oxide-hydroxide nanoparticles with spherical morphology. The iron oxide-hydroxide nanoparticles showed an excellent ability to remove fluoride (F − from contaminated water over a wide range of pH. The influences of temperature, stirring speed, pH, adsorbent dose and contact time were studied. The equilibrium data were tested with various isotherm models and finally, a calculation procedure was reported for the calculation of adsorbent requirement. The fluoride adsorbed nanoparticles was regenerated upto 70% using sodium hydroxide or hydrochloric acid solution. The iron oxide-hydroxide nanoparticles can be used as an effective and replicable adsorbent media for defluoridation of water in presence of competing anions like chloride, iodate, iodide and sulphate. low in cost, robust, environmentally benign and simple. The efficiency of adsorption technique depends upon the nature of adsorbents used. Many adsorbents were tried for fluoride removal namely activated alumina, 4 hydrated cement, 13 hydroxyapatite, 14 activated carbon, 15 16 quick lime, 17 hydrotalcite, 18 clay, 19 20 ion exchanger, 21 cotton cellulose, 22 waste residue, 23 geomaterials, 24 plaster of Paris, 25 brick powder, 26 composite, 27 etc. Due to small size and high surface area to volume ratio, metal nanoparticles often exhibit interesting optical, electronic, magnetic, and chemical properties that differ considerably from their bulk counterparts. 28-30 Nanomaterials showed good performances near neutral pH values. It is probable that most of those materials would not be stable at extreme pH values and therefore may not have application value to polishing industrial wastewaters containing fluoride unless the pH is adjusted.

Research paper thumbnail of Vermiremediation of Water Treatment Plant Sludge employing Metaphire posthuma: A soil quality and metal solubility prediction approach

Ecological Engineering

Water Treatment Plant Sludge (WTPS) is formed during sewage treatment and is extremely rich in nu... more Water Treatment Plant Sludge (WTPS) is formed during sewage treatment and is extremely rich in nutrients (N, P and K) and toxic heavy metals. In this work, efficiency of vermicomposting technology was evaluated using an endogeic earthworm Metaphire posthuma, against aerobic composting in regard to stabilization of WTPS. Different combinations of WTPS and cow dung were utilized as feed stock. Low pH of WTPS changed towards neutrality under both the biocomposting systems. The contents of N (45–61%), P (50–80%) and K (83–88%) increased significantly under Metaphire vermicomposting system accompanied by substantial reduction in total organic C. Interestingly, improvement in soil quality and low accumulation of heavy metal (Cr and Cu) in soil under vermistabilized WTPS treatments was noteworthy. Moreover, the solubility pattern of non metal and metal ions in vermistabilized and crude WTPS was studied to understand their impacts on moist soil environment with the help of MINTEQ geochemica...

Research paper thumbnail of Nanoscale Copper II Oxide An Efficient and Reusable Adsorbent for Removal of Nickel II from Contaminated Water

Defence Life Science Journal

The present work describes the synthesis of copper(II) oxide nanoparticles (NPs) with high surfac... more The present work describes the synthesis of copper(II) oxide nanoparticles (NPs) with high surface area (52.11 m2/g) and its Ni(II) adsorption efficiency from contaminated water at room temperature. Copper (II) oxide NPs are able to remove Ni(II) as 93.6 per cent and 93.7 per cent using 500 ppb & 1000 ppb initial concentration of nickel at near-neutral pH respectively. CuO NPs is very much effective to remove more than 75 per cent nickel over a wide range of pH even in presence of other competing ions like Cd2+, Pb2+, Cr6+, SO42-. Prepared CuO NPs can be used to remove Ni(II) from aqueous solution in real field application.

Research paper thumbnail of Microwave assisted and in-situ generated palladium nanoparticles catalysed desulfitative synthesis of cross-biphenyls from arylsulfonyl chlorides and phenylboronic acids

Research paper thumbnail of Musa balbisiana Colla pseudostem biowaste mediated zinc oxide nanoparticles: Their antibiofilm and antibacterial potentiality

Current Research in Green and Sustainable Chemistry

Research paper thumbnail of Removal of Fluoride from Water Using Mesoporous MCM-41: An Optimization Approach Using Response Surface Methodology (RSM)

Advances in Nanoparticles

Fluoride above 1.5 mg·L-1 is injurious to health. Removal of fluoride from water using mesoporous... more Fluoride above 1.5 mg·L-1 is injurious to health. Removal of fluoride from water using mesoporous MCM-41 as a strong adsorbent material has been attempted. Characterization using transmission electron microscopic study of calcined MCM-41 showed the regular hexagonal array of mesoporous channels with an average size of 20 nm and the surface area (BET study) of 1306.96 m2·g-1. The average pore size of the particles was found to be 14.21 nm. A study on the effect of contact time on the removal of fluoride revealed that more than 85% uptake of fluoride onto MCM-41 was achieved at a contact time of 120 min. From the Langmuir adsorption study, the maximum sorption capacity of fluoride was found to be 63.05 mg/g at 301 K. From the thermodynamic study, the +ΔHo value of 2.29 kJ·mol-1 indicated the endothermic nature of the removal process. Application of Response Surface Model suggested that 77.88% of fluoride removal can be achieved at fluoride concentration of 10 mg·L-1, pH (6.3), and contact time of 120 min.

Research paper thumbnail of Green synthesis of carbon dot silver nanohybrids from fruits and vegetable’s peel waste: Applications as potent mosquito larvicide

Current Research in Green and Sustainable Chemistry

Abstract Background North East India is hot spots for several vector borne diseases such as malar... more Abstract Background North East India is hot spots for several vector borne diseases such as malaria and Japanese Encephalitis. In spite of taking several well executed plans, the diseases continue to explode from time to time. Therefore, effective measures need to be planned to control mosquito breeding. We have synthesized C-dot@silver nanohybrids using fruits and vegetable wastes like orange peels, mango peels and Taro (Colocasia). The nanohybrids show its bio-larvicidal efficacy against mosquito vectors like Aedes albopictus, Anopheles stephensi and Culex quinquefasciatus. Results An appreciable larvicidal activity is observed for all treated mosquito species (viz. Aedes albopictus, Anopheles stephensi and Culex quinquefasciatus) with materials concentration of 0.40–0.70 ​mg/L. High resolution transmission electron microscopic and optical microscopic images evidenced that nanohybrid enters into larval body through membrane resulting destruction of cuticle, head and all other parts. Conclusions The studies provide an eco-friendly, easy and green routes to synthesize silver nanohybrid utilizing fruits and vegetables waste materials and its application as mosquito larvicidal agent. It is highly effective at low concentration and stable against various conditions like temperature, other interfering chemicals etc. Hence, it would be green materials to control mosquito breeding with high potential. The studies can be scaled up keeping measured effectivity of materials to control mosquito breeding in sewage water, municipal garbages, stagnant water etc.

Research paper thumbnail of Infra Red Spectra of Different Species of Cultivated Oyster Mushrooms Possible Tool for Identifying Bioactive Compounds and Establishing Taxonomic Linkage

Defence Life Science Journal

Mushrooms are macrofungi that serve as a vegetarian source of protein along with various bio-acti... more Mushrooms are macrofungi that serve as a vegetarian source of protein along with various bio-active molecules of primary health importance. The activity of the bio-active molecules range from antioxidant, immunomodulation, hepatoprotection. Cultivated oyster mushrooms are also rich in these components which may be estimated quantitatively by skill intensive ‘destructive’ chemical techniques. Infra Red spectroscopy provides a non-destructive user friendly technique to quickly assess the presence of bio-active compounds in mushroom species to be used as a quality control measure as this non-destructive tool can be used to segregate mushroom harvest according to availability of bioactive compounds. IR spectra based strain classification and taxa delimitation of mushroom samples are also attempted vis a vis DNA sequence based phylogeny analysis of the same, but no correlation is observed between the two types of phylogeny analysis.

Research paper thumbnail of Bio-nanoparticle assembly: a potent on-site biolarvicidal agent against mosquito vectors

RSC Advances

The present work demonstrates a potent and stable biolarvicidal agent using sustainable bioresour... more The present work demonstrates a potent and stable biolarvicidal agent using sustainable bioresources. The synthesized nanomaterials can control the mosquito vectors at a very low concentration range (0.01–1.00 mg L−1) for on-site field applications.

Research paper thumbnail of A convenient room temperature ipso ‐nitration of arylboronic acid catalysed by molecular iodine using zirconium oxynitrate as nitrating species: An experimental and theoretical investigation

Applied Organometallic Chemistry

Research paper thumbnail of Nanoweapon: control of mosquito breeding using carbon-dot-silver nanohybrid as a biolarvicide

Environmental Chemistry Letters

Health issues induced by mosquito illnesses highlight the need for effective control. Here, we de... more Health issues induced by mosquito illnesses highlight the need for effective control. Here, we developed an efficient carbon-dot-silver nanohybrid to control Anopheles stephensi and Culex quinquefasciatus mosquito species. The nanohybrid was synthesized using a thermal method without addition of any toxic-reducing agent. Monohybrids are found within the ranges of 2–6 nm for carbon-dot and 10–35 nm for silver nanoparticles with uniform distribution. The uniformly dispersed nanohybrid solutions show excellent larvicidal activity within the concentration range of 0.5–1.0 ppm. Morphological studies evidence the presence of strong bonds between nanohybrid and sulphur- or phosphorus-containing compounds such as proteins and DNA present in the larval body. This explains tissue damage at very low concentrations of nanohybrid. Therefore, this nanoweapon has high potential for field applications.

Research paper thumbnail of Methanol aided synthesis of PdNPs decorated on montmorillonite K 10 and its implication in Suzuki Miyaura type cross coupling reaction under base free condition

Applied Organometallic Chemistry

Research paper thumbnail of Vermi-sanitization of toxic silk industry waste employing Eisenia fetida and Eudrilus eugeniae: Substrate compatibility, nutrient enrichment and metal accumulation dynamics

Bioresource technology, 2018

Detoxification of silk processing effluents and sludge (SPES) through composting approaches is a ... more Detoxification of silk processing effluents and sludge (SPES) through composting approaches is a new idea. This study examined the biodegradation potential of two epigeic earthworms (Eisenia fetida and Eudrilus eugeniae) in different SPES and cow dung (CD) mixtures in comparison with composting. N, P, S, Fe and Mn availability significantly increased upon vermicomposting compared to aerobic composting. The alkaline pH of the feedstocks satisfactorily neutralized under vermicomposting. The Ca-K availability and cation exchange dynamics readily stabilized due to vermicomposting. Interestingly, Eisenia fetida exhibited greater adaptability towards the toxic SPES materials than Eudrilus eugeniae, which was accompanied by 60-70% reduction of Cd, Cr, Zn and Pb levels in Eisenia system, whereas metal accumulation ability of Eudrilus eugeniae was remarkable. Moreover, both the species equally contributed in augmentation of beneficial (N-fixing and P-solubilizing) microorganisms in the feeds...

Research paper thumbnail of Vermiremediation of Water Treatment Plant Sludge employing Metaphire posthuma: A soil quality and metal solubility prediction approach

Research paper thumbnail of Copper Oxide Nanoparticles as a Mild and Efficient Catalyst for N-Arylation of Imidazole and Aniline with Boronic Acids at Room Temperature

Synlett

The present work describes the excellent catalytic activity of copper(II) oxide nanoparticles (NP... more The present work describes the excellent catalytic activity of copper(II) oxide nanoparticles (NPs) towards N-arylation of aniline and imidazole at room temperature. The copper(II)oxide NPs were synthesized by a thermal refluxing technique and characterized by FT-IR spectroscopy; powder XRD, SEM, EDX, TEM, TGA, XPS, BET surface area analysis, and particle size analysis. The size of the NPs was found to be around 12 nm having a surface area of 164.180 m2 g–1.The catalytic system was also found to be recyclable and could be reused in subsequent catalytic runs without a significant loss of activity.

Research paper thumbnail of Magnetic Ni/PPy nanocomposite as effective reusable adsorbent for removal of arsenite and fluoride from contaminated water

RSC Adv., 2016

Magnetic nickel/polypyrrole nanostructure has been in situ synthesized at room temperature and ch... more Magnetic nickel/polypyrrole nanostructure has been in situ synthesized at room temperature and characterized. It acts as an effective reusable adsorbent for removal of arsenite and fluoride from contaminated water as well as ground water.

Research paper thumbnail of Heavy Metal Contaminants of Underground Water in Indo Bangla Border Districts of Tripura, India

International Journal of Chemtech Research, Mar 1, 2011

... Saumen Banerjee*, Bodhaditya Das, Iohborlang M. Umlong, Rashmi R. Devi, Hiran Kalita, Lakshya... more ... Saumen Banerjee*, Bodhaditya Das, Iohborlang M. Umlong, Rashmi R. Devi, Hiran Kalita, Lakshya Bijoy Saikia, Kusum Borah, Prasanta K. Raul and Lokendra Singh ... INTRODUCTION: Water is symbolic heritage of Indian continent in the nature of Ganga and Brahmaputra. ...

Research paper thumbnail of ChemInform Abstract: In Water Homocoupling of Arylboronic Acids Using Nano-Rod Shaped and Reusable Copper Oxide(II) Catalyst at Room Temperature

Research paper thumbnail of Sustainable-Resource-Based Carbon Dot–Silver Nanohybrid: A Strong Tool againstCulex quinquefasciatus, a Common Disease Vector

ACS Sustainable Chemistry & Engineering, 2016

With the evolution of material science, researchers are deeply concerned about the utility of sus... more With the evolution of material science, researchers are deeply concerned about the utility of sustainable resources for multifaceted advanced applications. Here we project an abundant, nonedible bioresource-based carbon dot–silver nanohybrid as a highly competent larvicidal agent against Culex quinquefasciatus. Mosquitoes have been the closest enemy of humankind for a very long time. Tropical areas around the globe suffer severe ailments due to mosquito-vector-borne diseases. Japanese encephalitis, lymphatic filariasis, etc. are such fatal threats spread by Culex species. With the emergence of nanotechnology, the perspectives of conventional antivector materials have changed dramatically. The C-dot precursor used here was the roots of Cyperus rotundus, a very abundant grass species found in South Asian countries. The nanohybrid was synthesized by a simple thermal approach without the application of additional reducing agent. The nanohybrid was distributed within a narrow size window of <10 nm. The materia...

Research paper thumbnail of In water homocoupling of arylboronic acids using nano-rod shaped and reusable copper oxide(II) catalyst at room temperature

Tetrahedron Letters, 2015

Abstract The work describes a simple in situ soft chemical synthesis of rod shaped nano CuO, char... more Abstract The work describes a simple in situ soft chemical synthesis of rod shaped nano CuO, characterization and study of its catalytic performance in the aerobic homocoupling of arylboronic acids to synthesize symmetrical biphenyls. The catalyst is simple to prepare, environmentally benign, efficient, easy recovery, reusable, stable and heterogeneous in nature.

Research paper thumbnail of Removal of Fluoride from Water Using Iron Oxide-Hydroxide Nanoparticles

Journal of Nanoscience and Nanotechnology, 2012

A novel and facile method for the synthesis of uniform stoichiometric powder form of non-magnetic... more A novel and facile method for the synthesis of uniform stoichiometric powder form of non-magnetic iron oxide-hydroxide nanoparticles with spherical morphology and its application for defluoridation of drinking water is reported. X-ray powder diffraction analysis (XRD), BET surface area, FTIR, field emission scanning electron microscopy (FESEM) and Transmission electron microscopy (TEM) images were used to characterize nanoscale iron oxide-hydroxide. Transmission electron microscopy (TEM) image revealed the formation of iron oxide-hydroxide nanoparticles with spherical morphology. The iron oxide-hydroxide nanoparticles showed an excellent ability to remove fluoride (F − from contaminated water over a wide range of pH. The influences of temperature, stirring speed, pH, adsorbent dose and contact time were studied. The equilibrium data were tested with various isotherm models and finally, a calculation procedure was reported for the calculation of adsorbent requirement. The fluoride adsorbed nanoparticles was regenerated upto 70% using sodium hydroxide or hydrochloric acid solution. The iron oxide-hydroxide nanoparticles can be used as an effective and replicable adsorbent media for defluoridation of water in presence of competing anions like chloride, iodate, iodide and sulphate. low in cost, robust, environmentally benign and simple. The efficiency of adsorption technique depends upon the nature of adsorbents used. Many adsorbents were tried for fluoride removal namely activated alumina, 4 hydrated cement, 13 hydroxyapatite, 14 activated carbon, 15 16 quick lime, 17 hydrotalcite, 18 clay, 19 20 ion exchanger, 21 cotton cellulose, 22 waste residue, 23 geomaterials, 24 plaster of Paris, 25 brick powder, 26 composite, 27 etc. Due to small size and high surface area to volume ratio, metal nanoparticles often exhibit interesting optical, electronic, magnetic, and chemical properties that differ considerably from their bulk counterparts. 28-30 Nanomaterials showed good performances near neutral pH values. It is probable that most of those materials would not be stable at extreme pH values and therefore may not have application value to polishing industrial wastewaters containing fluoride unless the pH is adjusted.

Research paper thumbnail of Vermiremediation of Water Treatment Plant Sludge employing Metaphire posthuma: A soil quality and metal solubility prediction approach

Ecological Engineering

Water Treatment Plant Sludge (WTPS) is formed during sewage treatment and is extremely rich in nu... more Water Treatment Plant Sludge (WTPS) is formed during sewage treatment and is extremely rich in nutrients (N, P and K) and toxic heavy metals. In this work, efficiency of vermicomposting technology was evaluated using an endogeic earthworm Metaphire posthuma, against aerobic composting in regard to stabilization of WTPS. Different combinations of WTPS and cow dung were utilized as feed stock. Low pH of WTPS changed towards neutrality under both the biocomposting systems. The contents of N (45–61%), P (50–80%) and K (83–88%) increased significantly under Metaphire vermicomposting system accompanied by substantial reduction in total organic C. Interestingly, improvement in soil quality and low accumulation of heavy metal (Cr and Cu) in soil under vermistabilized WTPS treatments was noteworthy. Moreover, the solubility pattern of non metal and metal ions in vermistabilized and crude WTPS was studied to understand their impacts on moist soil environment with the help of MINTEQ geochemica...

Research paper thumbnail of Nanoscale Copper II Oxide An Efficient and Reusable Adsorbent for Removal of Nickel II from Contaminated Water

Defence Life Science Journal

The present work describes the synthesis of copper(II) oxide nanoparticles (NPs) with high surfac... more The present work describes the synthesis of copper(II) oxide nanoparticles (NPs) with high surface area (52.11 m2/g) and its Ni(II) adsorption efficiency from contaminated water at room temperature. Copper (II) oxide NPs are able to remove Ni(II) as 93.6 per cent and 93.7 per cent using 500 ppb & 1000 ppb initial concentration of nickel at near-neutral pH respectively. CuO NPs is very much effective to remove more than 75 per cent nickel over a wide range of pH even in presence of other competing ions like Cd2+, Pb2+, Cr6+, SO42-. Prepared CuO NPs can be used to remove Ni(II) from aqueous solution in real field application.

Research paper thumbnail of Microwave assisted and in-situ generated palladium nanoparticles catalysed desulfitative synthesis of cross-biphenyls from arylsulfonyl chlorides and phenylboronic acids

Research paper thumbnail of Musa balbisiana Colla pseudostem biowaste mediated zinc oxide nanoparticles: Their antibiofilm and antibacterial potentiality

Current Research in Green and Sustainable Chemistry

Research paper thumbnail of Removal of Fluoride from Water Using Mesoporous MCM-41: An Optimization Approach Using Response Surface Methodology (RSM)

Advances in Nanoparticles

Fluoride above 1.5 mg·L-1 is injurious to health. Removal of fluoride from water using mesoporous... more Fluoride above 1.5 mg·L-1 is injurious to health. Removal of fluoride from water using mesoporous MCM-41 as a strong adsorbent material has been attempted. Characterization using transmission electron microscopic study of calcined MCM-41 showed the regular hexagonal array of mesoporous channels with an average size of 20 nm and the surface area (BET study) of 1306.96 m2·g-1. The average pore size of the particles was found to be 14.21 nm. A study on the effect of contact time on the removal of fluoride revealed that more than 85% uptake of fluoride onto MCM-41 was achieved at a contact time of 120 min. From the Langmuir adsorption study, the maximum sorption capacity of fluoride was found to be 63.05 mg/g at 301 K. From the thermodynamic study, the +ΔHo value of 2.29 kJ·mol-1 indicated the endothermic nature of the removal process. Application of Response Surface Model suggested that 77.88% of fluoride removal can be achieved at fluoride concentration of 10 mg·L-1, pH (6.3), and contact time of 120 min.

Research paper thumbnail of Green synthesis of carbon dot silver nanohybrids from fruits and vegetable’s peel waste: Applications as potent mosquito larvicide

Current Research in Green and Sustainable Chemistry

Abstract Background North East India is hot spots for several vector borne diseases such as malar... more Abstract Background North East India is hot spots for several vector borne diseases such as malaria and Japanese Encephalitis. In spite of taking several well executed plans, the diseases continue to explode from time to time. Therefore, effective measures need to be planned to control mosquito breeding. We have synthesized C-dot@silver nanohybrids using fruits and vegetable wastes like orange peels, mango peels and Taro (Colocasia). The nanohybrids show its bio-larvicidal efficacy against mosquito vectors like Aedes albopictus, Anopheles stephensi and Culex quinquefasciatus. Results An appreciable larvicidal activity is observed for all treated mosquito species (viz. Aedes albopictus, Anopheles stephensi and Culex quinquefasciatus) with materials concentration of 0.40–0.70 ​mg/L. High resolution transmission electron microscopic and optical microscopic images evidenced that nanohybrid enters into larval body through membrane resulting destruction of cuticle, head and all other parts. Conclusions The studies provide an eco-friendly, easy and green routes to synthesize silver nanohybrid utilizing fruits and vegetables waste materials and its application as mosquito larvicidal agent. It is highly effective at low concentration and stable against various conditions like temperature, other interfering chemicals etc. Hence, it would be green materials to control mosquito breeding with high potential. The studies can be scaled up keeping measured effectivity of materials to control mosquito breeding in sewage water, municipal garbages, stagnant water etc.

Research paper thumbnail of Infra Red Spectra of Different Species of Cultivated Oyster Mushrooms Possible Tool for Identifying Bioactive Compounds and Establishing Taxonomic Linkage

Defence Life Science Journal

Mushrooms are macrofungi that serve as a vegetarian source of protein along with various bio-acti... more Mushrooms are macrofungi that serve as a vegetarian source of protein along with various bio-active molecules of primary health importance. The activity of the bio-active molecules range from antioxidant, immunomodulation, hepatoprotection. Cultivated oyster mushrooms are also rich in these components which may be estimated quantitatively by skill intensive ‘destructive’ chemical techniques. Infra Red spectroscopy provides a non-destructive user friendly technique to quickly assess the presence of bio-active compounds in mushroom species to be used as a quality control measure as this non-destructive tool can be used to segregate mushroom harvest according to availability of bioactive compounds. IR spectra based strain classification and taxa delimitation of mushroom samples are also attempted vis a vis DNA sequence based phylogeny analysis of the same, but no correlation is observed between the two types of phylogeny analysis.

Research paper thumbnail of Bio-nanoparticle assembly: a potent on-site biolarvicidal agent against mosquito vectors

RSC Advances

The present work demonstrates a potent and stable biolarvicidal agent using sustainable bioresour... more The present work demonstrates a potent and stable biolarvicidal agent using sustainable bioresources. The synthesized nanomaterials can control the mosquito vectors at a very low concentration range (0.01–1.00 mg L−1) for on-site field applications.

Research paper thumbnail of A convenient room temperature ipso ‐nitration of arylboronic acid catalysed by molecular iodine using zirconium oxynitrate as nitrating species: An experimental and theoretical investigation

Applied Organometallic Chemistry

Research paper thumbnail of Nanoweapon: control of mosquito breeding using carbon-dot-silver nanohybrid as a biolarvicide

Environmental Chemistry Letters

Health issues induced by mosquito illnesses highlight the need for effective control. Here, we de... more Health issues induced by mosquito illnesses highlight the need for effective control. Here, we developed an efficient carbon-dot-silver nanohybrid to control Anopheles stephensi and Culex quinquefasciatus mosquito species. The nanohybrid was synthesized using a thermal method without addition of any toxic-reducing agent. Monohybrids are found within the ranges of 2–6 nm for carbon-dot and 10–35 nm for silver nanoparticles with uniform distribution. The uniformly dispersed nanohybrid solutions show excellent larvicidal activity within the concentration range of 0.5–1.0 ppm. Morphological studies evidence the presence of strong bonds between nanohybrid and sulphur- or phosphorus-containing compounds such as proteins and DNA present in the larval body. This explains tissue damage at very low concentrations of nanohybrid. Therefore, this nanoweapon has high potential for field applications.

Research paper thumbnail of Methanol aided synthesis of PdNPs decorated on montmorillonite K 10 and its implication in Suzuki Miyaura type cross coupling reaction under base free condition

Applied Organometallic Chemistry

Research paper thumbnail of Vermi-sanitization of toxic silk industry waste employing Eisenia fetida and Eudrilus eugeniae: Substrate compatibility, nutrient enrichment and metal accumulation dynamics

Bioresource technology, 2018

Detoxification of silk processing effluents and sludge (SPES) through composting approaches is a ... more Detoxification of silk processing effluents and sludge (SPES) through composting approaches is a new idea. This study examined the biodegradation potential of two epigeic earthworms (Eisenia fetida and Eudrilus eugeniae) in different SPES and cow dung (CD) mixtures in comparison with composting. N, P, S, Fe and Mn availability significantly increased upon vermicomposting compared to aerobic composting. The alkaline pH of the feedstocks satisfactorily neutralized under vermicomposting. The Ca-K availability and cation exchange dynamics readily stabilized due to vermicomposting. Interestingly, Eisenia fetida exhibited greater adaptability towards the toxic SPES materials than Eudrilus eugeniae, which was accompanied by 60-70% reduction of Cd, Cr, Zn and Pb levels in Eisenia system, whereas metal accumulation ability of Eudrilus eugeniae was remarkable. Moreover, both the species equally contributed in augmentation of beneficial (N-fixing and P-solubilizing) microorganisms in the feeds...

Research paper thumbnail of Vermiremediation of Water Treatment Plant Sludge employing Metaphire posthuma: A soil quality and metal solubility prediction approach

Research paper thumbnail of Copper Oxide Nanoparticles as a Mild and Efficient Catalyst for N-Arylation of Imidazole and Aniline with Boronic Acids at Room Temperature

Synlett

The present work describes the excellent catalytic activity of copper(II) oxide nanoparticles (NP... more The present work describes the excellent catalytic activity of copper(II) oxide nanoparticles (NPs) towards N-arylation of aniline and imidazole at room temperature. The copper(II)oxide NPs were synthesized by a thermal refluxing technique and characterized by FT-IR spectroscopy; powder XRD, SEM, EDX, TEM, TGA, XPS, BET surface area analysis, and particle size analysis. The size of the NPs was found to be around 12 nm having a surface area of 164.180 m2 g–1.The catalytic system was also found to be recyclable and could be reused in subsequent catalytic runs without a significant loss of activity.

Research paper thumbnail of Magnetic Ni/PPy nanocomposite as effective reusable adsorbent for removal of arsenite and fluoride from contaminated water

RSC Adv., 2016

Magnetic nickel/polypyrrole nanostructure has been in situ synthesized at room temperature and ch... more Magnetic nickel/polypyrrole nanostructure has been in situ synthesized at room temperature and characterized. It acts as an effective reusable adsorbent for removal of arsenite and fluoride from contaminated water as well as ground water.

Research paper thumbnail of Heavy Metal Contaminants of Underground Water in Indo Bangla Border Districts of Tripura, India

International Journal of Chemtech Research, Mar 1, 2011

... Saumen Banerjee*, Bodhaditya Das, Iohborlang M. Umlong, Rashmi R. Devi, Hiran Kalita, Lakshya... more ... Saumen Banerjee*, Bodhaditya Das, Iohborlang M. Umlong, Rashmi R. Devi, Hiran Kalita, Lakshya Bijoy Saikia, Kusum Borah, Prasanta K. Raul and Lokendra Singh ... INTRODUCTION: Water is symbolic heritage of Indian continent in the nature of Ganga and Brahmaputra. ...

Research paper thumbnail of ChemInform Abstract: In Water Homocoupling of Arylboronic Acids Using Nano-Rod Shaped and Reusable Copper Oxide(II) Catalyst at Room Temperature

Research paper thumbnail of Sustainable-Resource-Based Carbon Dot–Silver Nanohybrid: A Strong Tool againstCulex quinquefasciatus, a Common Disease Vector

ACS Sustainable Chemistry & Engineering, 2016

With the evolution of material science, researchers are deeply concerned about the utility of sus... more With the evolution of material science, researchers are deeply concerned about the utility of sustainable resources for multifaceted advanced applications. Here we project an abundant, nonedible bioresource-based carbon dot–silver nanohybrid as a highly competent larvicidal agent against Culex quinquefasciatus. Mosquitoes have been the closest enemy of humankind for a very long time. Tropical areas around the globe suffer severe ailments due to mosquito-vector-borne diseases. Japanese encephalitis, lymphatic filariasis, etc. are such fatal threats spread by Culex species. With the emergence of nanotechnology, the perspectives of conventional antivector materials have changed dramatically. The C-dot precursor used here was the roots of Cyperus rotundus, a very abundant grass species found in South Asian countries. The nanohybrid was synthesized by a simple thermal approach without the application of additional reducing agent. The nanohybrid was distributed within a narrow size window of <10 nm. The materia...

Research paper thumbnail of In water homocoupling of arylboronic acids using nano-rod shaped and reusable copper oxide(II) catalyst at room temperature

Tetrahedron Letters, 2015

Abstract The work describes a simple in situ soft chemical synthesis of rod shaped nano CuO, char... more Abstract The work describes a simple in situ soft chemical synthesis of rod shaped nano CuO, characterization and study of its catalytic performance in the aerobic homocoupling of arylboronic acids to synthesize symmetrical biphenyls. The catalyst is simple to prepare, environmentally benign, efficient, easy recovery, reusable, stable and heterogeneous in nature.