Girivyankatesh Hippargi | National Environmental Engineering Research Institute (original) (raw)
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Papers by Girivyankatesh Hippargi
Archives of environmental contamination and toxicology, Apr 1, 2024
Qeios 6 (10)
The alkali and alkaline earth metals such as potassium, sodium, barium and strontium are generall... more The alkali and alkaline earth metals such as potassium, sodium, barium and strontium are generally used as oxidizer in fireworks. The arbitrary use of these chemicals in fireworks is an acute issue responsible for higher emissions. Hence, efforts are underway to monitor these chemicals in fireworks. This work reports the precise determination of potassium and sodium in fireworks samples by flame photometry. The average deviation by flame photometry analysis was 7 to 8 % and 3 to 4 % for potassium and sodium, respectively, when the concentration of the respective metal nitrates in fireworks composition was less than 50%. R2 value 0.9943 and 0.9968 calculated from a better-fit regression model for potassium and sodium, respectively, corroborated the smaller difference between the predicted value and the observed value of flame photometry results. The effect of different components in fireworks mixture, such as nitrate and metal precursor, were also studied to understand their impact on results. A brief study in terms of limit of detection (LOD), limit of quantification (LOQ) and dynamic range was also performed, which showed 0.42 and 3.26 mg/L as LOD and 1.29 and 9.88 mg L-1 as LOQ for the analysis of sodium and potassium, respectively. In summary, the study proved the prospective of flame photometry for determining sodium and potassium in fireworks samples.
International Journal of Environmental Analytical Chemistry , 2024
Phthalates are high-production volume industrial chemicals used as plasticisers in polymers and a... more Phthalates are high-production volume industrial chemicals used as plasticisers in polymers and additives in several consumer goods. Phthalates are ubiquitously present in the environmental compartments. This review aims to enhance the understanding of phthalate contamination in the water environment and support the development of effective monitoring strategies. This article reviews the sources and occurrence of phthalates in water environments, recent developments in analytical methods, emphasising innovative extraction techniques such as solid-phase microextraction, magnetic stir bar, hollow-fibre liquid-phase microextraction, and dispersive liquid-liquid microextraction. Analytical methods using gas chromatography-mass spectrometry and liquid chromatography-mass spectrometry techniques are comprehensively reviewed. Strategies to minimise laboratory background contamination and optimise blank control are also discussed. The review critically evaluates existing knowledge and highlights key findings and implications for water quality assessment and management.
Archives of Environmental Contamination and Toxicology 86 (3), 288-303, 2024
Green energy and technology, 2024
International Journal of Hydrogen Energy, Dec 31, 2023
Research Square (Research Square), Sep 14, 2023
Geophysical tools have emerged as a potential solution to monitor bioremediation of petroleum con... more Geophysical tools have emerged as a potential solution to monitor bioremediation of petroleum contaminated soil. Monitoring of herbicide bioremediation so far is lacking. In the present study, we formulated a geophysical approach for monitoring herbicides bioremediation in agriculture soil. Complex dielectric permittivity and conductivity was used to monitored in four microcosm setups i.e., control, herbicide contaminated soil, bioaugmentation and biostimulation. Real and imaginary dielectric permittivity showed different patterns of temporal changes for four microcosms. In the bioagumentated microcosm, the degradation was more prominent and real dielectric permittivity increased twice and achieved peak. Achieved two peaks signify two distinct phenomenon of herbicide degradation and can be further explained through conductivity spectrum and microbial count approach. The major interesting phenomenon observed during the study was shift in peak frequency of imaginary conductivity due to increased biomass during herbicide degradation process. Complex Dielectric permittivity indicated the ability to monitor bioremediation herbicide contaminated soil when it was coupled with complex conductivity method. We expect the insights of the study will be relevant to promote multidisciplinary approach of using geophysical tools for monitoring microbial signatures. The results provide insights how this non-invasive geophysical toll can revolutionize the process of understanding the decontamination process.
Journal of Chemistry, Mar 31, 2021
Journal of The Taiwan Institute of Chemical Engineers, Jun 1, 2022
International Journal of Environmental Health Research, Oct 15, 2022
Fuel, May 1, 2021
Abstract In this work, we report the generation of blended fuel of hydrogen and methane by using ... more Abstract In this work, we report the generation of blended fuel of hydrogen and methane by using simultaneous photocatalysis and photoreforming reactions. A photocatalyst Au-Pt/TiO2 has been designed rationally and synthesized for the efficient electron transfer from Au to Pt and surface ensemble effects which improved the yield of hydrogen and methane. The distribution of Au and Pt nanoparticles were determined by using electron microscope investigations. The nanocatalyst was further studied for structural elucidation by using X-ray diffraction and optical spectroscopy. It was observed that the nanoparticles of Au and Pt dispersed on the TiO2 responsible for facilitation of electron transfer in UV and visible region. This mechanism easily excites TiO2 for catalytic transformation of carboxylic acid to hydrogen and methane. Under UV–Visible light (400 W) the newly developed catalyst reports effective production of hydrogen and methane at the rate of 9386 and 2208 µmol/h (14725 and 62579 µmol/h/g), respectively from acetic acid with apparent quantum yield of 3.85% at the bandgap of 3.2 eV. This catalytic production of hydrogen and methane (hythane gas) was examined using acetic acid enriched wastewater. The blended fuel obtained can be used in automobiles as the fuel with lower emissions compared with methane alone as the fuel.
In last two decades nanotechnology is emerged as a potential solution for various energy and envi... more In last two decades nanotechnology is emerged as a potential solution for various energy and environment challenges. Nowadays, nano materials based on polymer, inorganic materials, bio-materials extensively used for the detection and removal chemical and biological substances. The presence of hazardous pollutants and germs in water can also be effectively treated by using nanomaterials. The goal of this study was to synthesize carbon nanoparticles (CNPs) based on the waste materials which provides promising heating efficiency required for solar disinfection. Total 12 number of materials were prepared by using precursor of different agricultural and household wastes. All synthesized materials were evaluated for water heating efficiency in natural sunlight. The highest water heating efficiency was achieved with the CNPs prepared from the precursor of P-1 vegetable wastes. This promising material was also studied for the water disinfection application which accomplishes zero E-coli (6 log reduction) within span of 90 minutes.
Environmental Science and Pollution Research, Sep 11, 2017
Adsorption of three pharmaceuticals and personal care products (PPCPs), namely caffeine, ibuprofe... more Adsorption of three pharmaceuticals and personal care products (PPCPs), namely caffeine, ibuprofen and triclosan on commercial powdered activated carbon was examined in aqueous medium. The contaminants were chosen based on their diverse log K ow (octanol-water partition coefficient) viz. − 0.07 for caffeine, 3.97 for ibuprofen and 4.76 for triclosan to examine the role of hydrophobicity on adsorption process. The adsorbent characterisation was achieved using BET surface area, SEM, pore size distribution studies and FTIR. Influence of mass of PAC, contact time, solution pH and initial concentration on adsorption capacity of PAC was studied. Adsorption isotherms and kinetics were applied to establish the mechanism of adsorption. The kinetics followed pseudosecond order with physisorption occurring through particle diffusion. The Freundlich model fitted best among the isotherm models. The adsorption capacity increased in the order CFN < IBU < TCS which correlates with increasing hydrophobicity (log K ow), molecular weight and decreasing water solubility, respectively. We conclude that micro-pollutant hydrophobicity contributes towards adsorption on activated carbon.
Environmental Science and Pollution Research
International Journal of Environmental Health Research
Journal of Industrial and Engineering Chemistry
Environmental Technology & Innovation
Archives of environmental contamination and toxicology, Apr 1, 2024
Qeios 6 (10)
The alkali and alkaline earth metals such as potassium, sodium, barium and strontium are generall... more The alkali and alkaline earth metals such as potassium, sodium, barium and strontium are generally used as oxidizer in fireworks. The arbitrary use of these chemicals in fireworks is an acute issue responsible for higher emissions. Hence, efforts are underway to monitor these chemicals in fireworks. This work reports the precise determination of potassium and sodium in fireworks samples by flame photometry. The average deviation by flame photometry analysis was 7 to 8 % and 3 to 4 % for potassium and sodium, respectively, when the concentration of the respective metal nitrates in fireworks composition was less than 50%. R2 value 0.9943 and 0.9968 calculated from a better-fit regression model for potassium and sodium, respectively, corroborated the smaller difference between the predicted value and the observed value of flame photometry results. The effect of different components in fireworks mixture, such as nitrate and metal precursor, were also studied to understand their impact on results. A brief study in terms of limit of detection (LOD), limit of quantification (LOQ) and dynamic range was also performed, which showed 0.42 and 3.26 mg/L as LOD and 1.29 and 9.88 mg L-1 as LOQ for the analysis of sodium and potassium, respectively. In summary, the study proved the prospective of flame photometry for determining sodium and potassium in fireworks samples.
International Journal of Environmental Analytical Chemistry , 2024
Phthalates are high-production volume industrial chemicals used as plasticisers in polymers and a... more Phthalates are high-production volume industrial chemicals used as plasticisers in polymers and additives in several consumer goods. Phthalates are ubiquitously present in the environmental compartments. This review aims to enhance the understanding of phthalate contamination in the water environment and support the development of effective monitoring strategies. This article reviews the sources and occurrence of phthalates in water environments, recent developments in analytical methods, emphasising innovative extraction techniques such as solid-phase microextraction, magnetic stir bar, hollow-fibre liquid-phase microextraction, and dispersive liquid-liquid microextraction. Analytical methods using gas chromatography-mass spectrometry and liquid chromatography-mass spectrometry techniques are comprehensively reviewed. Strategies to minimise laboratory background contamination and optimise blank control are also discussed. The review critically evaluates existing knowledge and highlights key findings and implications for water quality assessment and management.
Archives of Environmental Contamination and Toxicology 86 (3), 288-303, 2024
Green energy and technology, 2024
International Journal of Hydrogen Energy, Dec 31, 2023
Research Square (Research Square), Sep 14, 2023
Geophysical tools have emerged as a potential solution to monitor bioremediation of petroleum con... more Geophysical tools have emerged as a potential solution to monitor bioremediation of petroleum contaminated soil. Monitoring of herbicide bioremediation so far is lacking. In the present study, we formulated a geophysical approach for monitoring herbicides bioremediation in agriculture soil. Complex dielectric permittivity and conductivity was used to monitored in four microcosm setups i.e., control, herbicide contaminated soil, bioaugmentation and biostimulation. Real and imaginary dielectric permittivity showed different patterns of temporal changes for four microcosms. In the bioagumentated microcosm, the degradation was more prominent and real dielectric permittivity increased twice and achieved peak. Achieved two peaks signify two distinct phenomenon of herbicide degradation and can be further explained through conductivity spectrum and microbial count approach. The major interesting phenomenon observed during the study was shift in peak frequency of imaginary conductivity due to increased biomass during herbicide degradation process. Complex Dielectric permittivity indicated the ability to monitor bioremediation herbicide contaminated soil when it was coupled with complex conductivity method. We expect the insights of the study will be relevant to promote multidisciplinary approach of using geophysical tools for monitoring microbial signatures. The results provide insights how this non-invasive geophysical toll can revolutionize the process of understanding the decontamination process.
Journal of Chemistry, Mar 31, 2021
Journal of The Taiwan Institute of Chemical Engineers, Jun 1, 2022
International Journal of Environmental Health Research, Oct 15, 2022
Fuel, May 1, 2021
Abstract In this work, we report the generation of blended fuel of hydrogen and methane by using ... more Abstract In this work, we report the generation of blended fuel of hydrogen and methane by using simultaneous photocatalysis and photoreforming reactions. A photocatalyst Au-Pt/TiO2 has been designed rationally and synthesized for the efficient electron transfer from Au to Pt and surface ensemble effects which improved the yield of hydrogen and methane. The distribution of Au and Pt nanoparticles were determined by using electron microscope investigations. The nanocatalyst was further studied for structural elucidation by using X-ray diffraction and optical spectroscopy. It was observed that the nanoparticles of Au and Pt dispersed on the TiO2 responsible for facilitation of electron transfer in UV and visible region. This mechanism easily excites TiO2 for catalytic transformation of carboxylic acid to hydrogen and methane. Under UV–Visible light (400 W) the newly developed catalyst reports effective production of hydrogen and methane at the rate of 9386 and 2208 µmol/h (14725 and 62579 µmol/h/g), respectively from acetic acid with apparent quantum yield of 3.85% at the bandgap of 3.2 eV. This catalytic production of hydrogen and methane (hythane gas) was examined using acetic acid enriched wastewater. The blended fuel obtained can be used in automobiles as the fuel with lower emissions compared with methane alone as the fuel.
In last two decades nanotechnology is emerged as a potential solution for various energy and envi... more In last two decades nanotechnology is emerged as a potential solution for various energy and environment challenges. Nowadays, nano materials based on polymer, inorganic materials, bio-materials extensively used for the detection and removal chemical and biological substances. The presence of hazardous pollutants and germs in water can also be effectively treated by using nanomaterials. The goal of this study was to synthesize carbon nanoparticles (CNPs) based on the waste materials which provides promising heating efficiency required for solar disinfection. Total 12 number of materials were prepared by using precursor of different agricultural and household wastes. All synthesized materials were evaluated for water heating efficiency in natural sunlight. The highest water heating efficiency was achieved with the CNPs prepared from the precursor of P-1 vegetable wastes. This promising material was also studied for the water disinfection application which accomplishes zero E-coli (6 log reduction) within span of 90 minutes.
Environmental Science and Pollution Research, Sep 11, 2017
Adsorption of three pharmaceuticals and personal care products (PPCPs), namely caffeine, ibuprofe... more Adsorption of three pharmaceuticals and personal care products (PPCPs), namely caffeine, ibuprofen and triclosan on commercial powdered activated carbon was examined in aqueous medium. The contaminants were chosen based on their diverse log K ow (octanol-water partition coefficient) viz. − 0.07 for caffeine, 3.97 for ibuprofen and 4.76 for triclosan to examine the role of hydrophobicity on adsorption process. The adsorbent characterisation was achieved using BET surface area, SEM, pore size distribution studies and FTIR. Influence of mass of PAC, contact time, solution pH and initial concentration on adsorption capacity of PAC was studied. Adsorption isotherms and kinetics were applied to establish the mechanism of adsorption. The kinetics followed pseudosecond order with physisorption occurring through particle diffusion. The Freundlich model fitted best among the isotherm models. The adsorption capacity increased in the order CFN < IBU < TCS which correlates with increasing hydrophobicity (log K ow), molecular weight and decreasing water solubility, respectively. We conclude that micro-pollutant hydrophobicity contributes towards adsorption on activated carbon.
Environmental Science and Pollution Research
International Journal of Environmental Health Research
Journal of Industrial and Engineering Chemistry
Environmental Technology & Innovation