ritu dalal - Academia.edu (original) (raw)
Papers by ritu dalal
ChemistrySelect, Aug 2, 2023
Development of a benign environmental catalyst for the generation of biodiesel is an area of impo... more Development of a benign environmental catalyst for the generation of biodiesel is an area of importance to reduce the overall usage of fossil fuels. In the current work, biochar was produced by slow pyrolysis of Irul wood sawdust. The optimization for biochar generation was carried out for different reaction temperatures and heating durations. The biochar was used to prepare solid acid catalysts by sulfonation process. The characterization of biochar and the sulfonated catalyst was carried out using Elemental analysis, Fourier Transform Infrared spectroscopy (FTIR), Powder X-ray Diffraction (XRD), Thermo Gravimetric Analysis (TGA), Scanning Electron Microscopy (SEM) and Surface area analyzer (BET). The characterization results showed that sulfonation of biochar resulted in biochar based solid acid catalyst containing various functional acidic groups like weak acidic-OH groups, strong acidic-COOH and SO 3 H groups. The total acid density and sulfonic acid group density of catalyst were estimated and showed excellent acidic sites concentration which gives good catalytic activity for biodiesel production through simultaneous esterification and transesterification. The enhanced catalytic activity is due to the high acid density of SO 3 H groups and the reactants accessibility towards acidic sites as well as the strong affinity between the hydrophilic reactants and the neutral OH groups which are bonded with the polycyclic aromatic carbon rings. The performance of biochar catalyst for the production of biodiesel was evaluated by comparing the yield obtained. The FTIR and Gas
Annals of phytomedicine, Apr 1, 2023
AATCC Journal of Research
Nanotechnology has become the foremost promising and rising field of analysis as a result of its ... more Nanotechnology has become the foremost promising and rising field of analysis as a result of its applications in numerous fields. Development of consistent and greener ways for the synthesis of nanoparticles could be a dynamic step in the field of nanotechnology. To avoid the emergence of dangerous by-products, many attempts have been made in recent years to develop environment friendly methods. “Green” synthesis is a consistent, sustainable, and environment friendly method for the synthesis of an enormous range of nanoparticles. Green synthesis is seen as an important tool to reduce the harmful effects of traditional nanoparticle synthesis methods commonly used in laboratories and industries. Nanoparticles exhibit unique chemical and physical properties that are useful in various fields. Among metallic nanoparticles, silver nanoparticles have become a research hotspot due to their wide range of applications. Silver nanoparticles are important because of their exceptional chemical, ...
Halosulfuron-methyl is a new frequently used sulfonylurea herbicide however there is lack of publ... more Halosulfuron-methyl is a new frequently used sulfonylurea herbicide however there is lack of published information on its leaching potential in soil. The mobility of halosulfuron-methyl at two application rates 50 and 100 μg in sandy loam soil was studied under laboratory conditions. Residues of halosulfuronmethyl in soil and leachate were estimated by HPLC-QDA. Under continuous as well as discontinuous flow conditions with stimulated rainfall of 300 mm, the movement of halosulfuron-methyl was observed throughout the column. Percent retention of halosulfuron-methyl was found to be maximum from 25-30 cm under continuous flow condition and maximum retention of halosulfuron-methyl was from 15-25 cm under discontinuous flow condition. Results obtained by the study revealed that halosulfuron-methyl was highly mobile in soil column. A comparable retention of halosulfuron-methyl residues at both doses was observed. Leachate fraction also contains halosulfuron-methyl residues.
Mini-Reviews in Organic Chemistry, 2022
: In the last few decades, metal nanoparticles have achieved great attention from researchers. Pa... more : In the last few decades, metal nanoparticles have achieved great attention from researchers. Particularly, the silver nanoparticles have great potential in a wide run of applications as antimicrobial, drug delivery carriers, sensors, optoelectronics and attractive gadgets. Designing a steady and natural neighbourly approach for the blend of metal nanoparticles could be a principal step within the field of nanotechnology. Awareness in “green nanotechnology” in nanoparticle synthesis is developing amongst scientists. In the last decade more than a hundred distinctive plant portion extracts were described for producing AgNPs. Most of the periodicals were concentrated on several plant parts for union and their characterization but as it were few articles centred on the role of biomolecules show in plants as well asworking conditions included within the amalgamation. This review highlights the prospective of plant extracts to hold out the synthesis of AgNPs with special stress on the bio-chemical and molecular mechanism involved in the synthesis of AgNPs using plant extract as a reducing and capping agent. The present review also consists of the characterization of AgNPs and the physical parameters affecting the size and shape of AgNPs.
A liquid chromatographic method with comfirmation by capillary electrophoresis was used to determ... more A liquid chromatographic method with comfirmation by capillary electrophoresis was used to determine 12 sulfonylurea herbicides in agricultural water. Analysis of 3 different water matrixes fortified at 2 levels gave good recoveries with adequate sensitivity at the 0.1 ppb level. A portion of the water was acidified with acetic acid and loaded onto an RP-102 solid-phase extraction (SPE) cartridge, and the extract was cleaned up on an alumina SPE cartridge. Extracts were desalted with an RP-102 SPE cartridge before instrumenta-tion. Samples needing chemical filtration, such as pond water, required additional cleanup with a SAX SPE cartridge before the alumina cleanup step. Data were compiled for both determinative techniques and evaluated.
ChemistrySelect, Aug 2, 2023
Development of a benign environmental catalyst for the generation of biodiesel is an area of impo... more Development of a benign environmental catalyst for the generation of biodiesel is an area of importance to reduce the overall usage of fossil fuels. In the current work, biochar was produced by slow pyrolysis of Irul wood sawdust. The optimization for biochar generation was carried out for different reaction temperatures and heating durations. The biochar was used to prepare solid acid catalysts by sulfonation process. The characterization of biochar and the sulfonated catalyst was carried out using Elemental analysis, Fourier Transform Infrared spectroscopy (FTIR), Powder X-ray Diffraction (XRD), Thermo Gravimetric Analysis (TGA), Scanning Electron Microscopy (SEM) and Surface area analyzer (BET). The characterization results showed that sulfonation of biochar resulted in biochar based solid acid catalyst containing various functional acidic groups like weak acidic-OH groups, strong acidic-COOH and SO 3 H groups. The total acid density and sulfonic acid group density of catalyst were estimated and showed excellent acidic sites concentration which gives good catalytic activity for biodiesel production through simultaneous esterification and transesterification. The enhanced catalytic activity is due to the high acid density of SO 3 H groups and the reactants accessibility towards acidic sites as well as the strong affinity between the hydrophilic reactants and the neutral OH groups which are bonded with the polycyclic aromatic carbon rings. The performance of biochar catalyst for the production of biodiesel was evaluated by comparing the yield obtained. The FTIR and Gas
Annals of phytomedicine, Apr 1, 2023
AATCC Journal of Research
Nanotechnology has become the foremost promising and rising field of analysis as a result of its ... more Nanotechnology has become the foremost promising and rising field of analysis as a result of its applications in numerous fields. Development of consistent and greener ways for the synthesis of nanoparticles could be a dynamic step in the field of nanotechnology. To avoid the emergence of dangerous by-products, many attempts have been made in recent years to develop environment friendly methods. “Green” synthesis is a consistent, sustainable, and environment friendly method for the synthesis of an enormous range of nanoparticles. Green synthesis is seen as an important tool to reduce the harmful effects of traditional nanoparticle synthesis methods commonly used in laboratories and industries. Nanoparticles exhibit unique chemical and physical properties that are useful in various fields. Among metallic nanoparticles, silver nanoparticles have become a research hotspot due to their wide range of applications. Silver nanoparticles are important because of their exceptional chemical, ...
Halosulfuron-methyl is a new frequently used sulfonylurea herbicide however there is lack of publ... more Halosulfuron-methyl is a new frequently used sulfonylurea herbicide however there is lack of published information on its leaching potential in soil. The mobility of halosulfuron-methyl at two application rates 50 and 100 μg in sandy loam soil was studied under laboratory conditions. Residues of halosulfuronmethyl in soil and leachate were estimated by HPLC-QDA. Under continuous as well as discontinuous flow conditions with stimulated rainfall of 300 mm, the movement of halosulfuron-methyl was observed throughout the column. Percent retention of halosulfuron-methyl was found to be maximum from 25-30 cm under continuous flow condition and maximum retention of halosulfuron-methyl was from 15-25 cm under discontinuous flow condition. Results obtained by the study revealed that halosulfuron-methyl was highly mobile in soil column. A comparable retention of halosulfuron-methyl residues at both doses was observed. Leachate fraction also contains halosulfuron-methyl residues.
Mini-Reviews in Organic Chemistry, 2022
: In the last few decades, metal nanoparticles have achieved great attention from researchers. Pa... more : In the last few decades, metal nanoparticles have achieved great attention from researchers. Particularly, the silver nanoparticles have great potential in a wide run of applications as antimicrobial, drug delivery carriers, sensors, optoelectronics and attractive gadgets. Designing a steady and natural neighbourly approach for the blend of metal nanoparticles could be a principal step within the field of nanotechnology. Awareness in “green nanotechnology” in nanoparticle synthesis is developing amongst scientists. In the last decade more than a hundred distinctive plant portion extracts were described for producing AgNPs. Most of the periodicals were concentrated on several plant parts for union and their characterization but as it were few articles centred on the role of biomolecules show in plants as well asworking conditions included within the amalgamation. This review highlights the prospective of plant extracts to hold out the synthesis of AgNPs with special stress on the bio-chemical and molecular mechanism involved in the synthesis of AgNPs using plant extract as a reducing and capping agent. The present review also consists of the characterization of AgNPs and the physical parameters affecting the size and shape of AgNPs.
A liquid chromatographic method with comfirmation by capillary electrophoresis was used to determ... more A liquid chromatographic method with comfirmation by capillary electrophoresis was used to determine 12 sulfonylurea herbicides in agricultural water. Analysis of 3 different water matrixes fortified at 2 levels gave good recoveries with adequate sensitivity at the 0.1 ppb level. A portion of the water was acidified with acetic acid and loaded onto an RP-102 solid-phase extraction (SPE) cartridge, and the extract was cleaned up on an alumina SPE cartridge. Extracts were desalted with an RP-102 SPE cartridge before instrumenta-tion. Samples needing chemical filtration, such as pond water, required additional cleanup with a SAX SPE cartridge before the alumina cleanup step. Data were compiled for both determinative techniques and evaluated.