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Papers by Sonalika Agrawal

Research paper thumbnail of Biofabrication of zinc oxide nanoparticles by using Lawsonia inermis L. seed extract

Inorganic and Nano-Metal Chemistry

Research paper thumbnail of Hydroxamic Acids as a Reductometric Titrants: Determination of Cerium in Alloys

Chemical Science Transactions, 2013

Research paper thumbnail of Effective removal of uranium from aqueous solution by using cerium oxide nanoparticles derived from citrus limon peel extract

Journal of Radioanalytical and Nuclear Chemistry, 2022

The current research focuses on the removal of uranium from biosynthesized CeO2 nanoparticles. Ce... more The current research focuses on the removal of uranium from biosynthesized CeO2 nanoparticles. Cerium oxide nanoparticles have been synthesized by the green synthesis route, ammonium cerium nitrate as the prime precursor, and plant extract from Citrus limon was proposed to produce CeO2NPs with spherical morphology and desired particle size. Prepared cerium oxide nanoparticles (CeO2NPs) were characterized via various types of equipment, such as Fourier transform infrared spectroscopy, X-ray diffraction spectroscopy, Energy-dispersive X-ray spectroscopy, Scanning Electron Microscope, Ultraviolet–Visible Spectroscopy, High-resolution transmission electron microscopy, Raman Spectroscopy. Langmuir and Freundlich's adsorption isotherms are used to study and analyse the adsorption potential of cerium oxide nanoparticles, as well as the concentration of uranium, effects of contact time adsorbent, adsorbate dosage, and pH. The highest adsorption capacity of CeO2 toward uranium (VI) is determined to be 46.2 mg g−1, indicating a high efficiency for uranium(VI) ion removal.

Research paper thumbnail of In-vitro molecular interaction of boron doped carbon dots with human serum albumin

IOP Conference Series: Materials Science and Engineering, 2021

Carbon dots have drawn prodigious attention in biomedical and biological fields by virtue of its ... more Carbon dots have drawn prodigious attention in biomedical and biological fields by virtue of its unique optical properties, but their effect on structure and behaviour of essential proteins have rarely been explored. In this study boron doped carbon dots (BCDs) which was synthesized by microwave treatment of citric acid, boric acid and urea, with maximum emission wavelength of 444 nm when excited upon long wavelength ultra-violet light. Synthesized BCDs were characterized by UV-Visible, FTIR, HRTEM and Fluorescence spectroscopy. Interaction between BCDs and human serum albumin (HSA) is carried out in physiological conditions. Stoichiometry of BCDs-HSA was found to be 1:1 and various thermodynamic parameters have also been calculated. The negative value of ΔG suggested that interaction between HSA and BCDs was spontaneous in nature.

Research paper thumbnail of Inhibition Effect of Bombax ceiba Flower Extract as Green Corrosion Inhibitor of Mild Steel in 0.5 M H2SO4 Medium

Asian Journal of Chemistry, 2017

Research paper thumbnail of Reductometric Titration and Quantum Chemical Study of Oxalohydroxamic Acid for Determination of Manganese in Ores and Alloys

Asian Journal of Chemistry, 2017

Research paper thumbnail of Removal of Uranium(VI) from Aqueous Solution by Iron Nanoparticles Synthesized from Testa Extract of Annacardium occidentale: A Fluorimetric Study

Asian Journal of Chemistry

Uranium(VI) is one of the most harmful and carcinogenic ion if present in water above its permiss... more Uranium(VI) is one of the most harmful and carcinogenic ion if present in water above its permissible limit. The main objective of this study is removal of uranium(VI) from water sample using nano zerovalent iron prepared by green synthesis approach with the help of Annacardium occidentale testa extract in which the whole process is completely environmental friendly and cost effective and does not involve any hazardous chemicals. Size of AO-Fe nanoparticle is characterized through UV-visible spectroscopy and FTIR analysis. Morphology of nanoparticle is studied using SEM-EDS and XRD analysis. The adsorption capacity of AO-Fe nanoparticle is studied using batch experiments. Effect of different parameters are then analyzed such as pH, adsorbent dosage, contact time and U(VI) ion concentration. Adsorption isotherm is also studied using Langmuir and Freundlich adsorption isotherm where correlation constant R2 is about 0.99.

Research paper thumbnail of Spectrophotometric studies on chelating behavior ofoxalohydroxamic acid with uranium in aqueous streams

Study of the complex formation of oxalohydroxamic acid (OHA) with uranium is investigated by spec... more Study of the complex formation of oxalohydroxamic acid (OHA) with uranium is investigated by spectrophotometry. Oxalohydroxamic acid forms orange-yellow complex with uranium(VI) in aqueous medium and shows maximum absorbance at 381 nm at pH 6.2. The stoichiometry of the coloured species is determined to be 1:5 ratios (uraniumoxalohydroxamic acid). A calibration graph is made for the concentration range of uranium from 10-100 mg/L. The molar absorption coefficient at 381nm, detection limit and Sendell’s sensitivity are 2230 LMol-1cm-1, 11 mg/L and 0.11 μg/cm2 respectively. Relative standard deviation is less than 2% and correlation coefficient is 0.998. In these studies, oxalohydroxamic acid complex with uranium, effect of reagent-metal ratio, pH and reagent stabilities are investigated. The results obtained by the proposed procedure are in good agreement with those obtained by the standard procedure. The advantage of the present study is that, it does not generate analytical waste b...

Research paper thumbnail of Synthesis of blue fluorescent carbon dotsfor sensitive and selective detection of glucose in biological samples

IOP Conference Series: Materials Science and Engineering

Research paper thumbnail of Hydroxamic Acids as a Reductometric Titrants: Determination of Cerium in Alloys

Hydroxamic acids like acetohydroxamic acid (AHA) and oxalohydroxamic acid (OHA) have been employe... more Hydroxamic acids like acetohydroxamic acid (AHA) and oxalohydroxamic acid (OHA) have been employed as a reductometric titrant for the determination of cerium in 2 N sulphuric acid. Stoichiometry of the reaction is established. One mole of AHA and OHA were found to consume 6.0 and 12.0 equivalents of the oxidant respectively in these reactions. The titre values are obtained by second derivative plots of potentiometric titrations.

Research paper thumbnail of Biofabrication of zinc oxide nanoparticles by using Lawsonia inermis L. seed extract

Inorganic and Nano-Metal Chemistry

Research paper thumbnail of Hydroxamic Acids as a Reductometric Titrants: Determination of Cerium in Alloys

Chemical Science Transactions, 2013

Research paper thumbnail of Effective removal of uranium from aqueous solution by using cerium oxide nanoparticles derived from citrus limon peel extract

Journal of Radioanalytical and Nuclear Chemistry, 2022

The current research focuses on the removal of uranium from biosynthesized CeO2 nanoparticles. Ce... more The current research focuses on the removal of uranium from biosynthesized CeO2 nanoparticles. Cerium oxide nanoparticles have been synthesized by the green synthesis route, ammonium cerium nitrate as the prime precursor, and plant extract from Citrus limon was proposed to produce CeO2NPs with spherical morphology and desired particle size. Prepared cerium oxide nanoparticles (CeO2NPs) were characterized via various types of equipment, such as Fourier transform infrared spectroscopy, X-ray diffraction spectroscopy, Energy-dispersive X-ray spectroscopy, Scanning Electron Microscope, Ultraviolet–Visible Spectroscopy, High-resolution transmission electron microscopy, Raman Spectroscopy. Langmuir and Freundlich's adsorption isotherms are used to study and analyse the adsorption potential of cerium oxide nanoparticles, as well as the concentration of uranium, effects of contact time adsorbent, adsorbate dosage, and pH. The highest adsorption capacity of CeO2 toward uranium (VI) is determined to be 46.2 mg g−1, indicating a high efficiency for uranium(VI) ion removal.

Research paper thumbnail of In-vitro molecular interaction of boron doped carbon dots with human serum albumin

IOP Conference Series: Materials Science and Engineering, 2021

Carbon dots have drawn prodigious attention in biomedical and biological fields by virtue of its ... more Carbon dots have drawn prodigious attention in biomedical and biological fields by virtue of its unique optical properties, but their effect on structure and behaviour of essential proteins have rarely been explored. In this study boron doped carbon dots (BCDs) which was synthesized by microwave treatment of citric acid, boric acid and urea, with maximum emission wavelength of 444 nm when excited upon long wavelength ultra-violet light. Synthesized BCDs were characterized by UV-Visible, FTIR, HRTEM and Fluorescence spectroscopy. Interaction between BCDs and human serum albumin (HSA) is carried out in physiological conditions. Stoichiometry of BCDs-HSA was found to be 1:1 and various thermodynamic parameters have also been calculated. The negative value of ΔG suggested that interaction between HSA and BCDs was spontaneous in nature.

Research paper thumbnail of Inhibition Effect of Bombax ceiba Flower Extract as Green Corrosion Inhibitor of Mild Steel in 0.5 M H2SO4 Medium

Asian Journal of Chemistry, 2017

Research paper thumbnail of Reductometric Titration and Quantum Chemical Study of Oxalohydroxamic Acid for Determination of Manganese in Ores and Alloys

Asian Journal of Chemistry, 2017

Research paper thumbnail of Removal of Uranium(VI) from Aqueous Solution by Iron Nanoparticles Synthesized from Testa Extract of Annacardium occidentale: A Fluorimetric Study

Asian Journal of Chemistry

Uranium(VI) is one of the most harmful and carcinogenic ion if present in water above its permiss... more Uranium(VI) is one of the most harmful and carcinogenic ion if present in water above its permissible limit. The main objective of this study is removal of uranium(VI) from water sample using nano zerovalent iron prepared by green synthesis approach with the help of Annacardium occidentale testa extract in which the whole process is completely environmental friendly and cost effective and does not involve any hazardous chemicals. Size of AO-Fe nanoparticle is characterized through UV-visible spectroscopy and FTIR analysis. Morphology of nanoparticle is studied using SEM-EDS and XRD analysis. The adsorption capacity of AO-Fe nanoparticle is studied using batch experiments. Effect of different parameters are then analyzed such as pH, adsorbent dosage, contact time and U(VI) ion concentration. Adsorption isotherm is also studied using Langmuir and Freundlich adsorption isotherm where correlation constant R2 is about 0.99.

Research paper thumbnail of Spectrophotometric studies on chelating behavior ofoxalohydroxamic acid with uranium in aqueous streams

Study of the complex formation of oxalohydroxamic acid (OHA) with uranium is investigated by spec... more Study of the complex formation of oxalohydroxamic acid (OHA) with uranium is investigated by spectrophotometry. Oxalohydroxamic acid forms orange-yellow complex with uranium(VI) in aqueous medium and shows maximum absorbance at 381 nm at pH 6.2. The stoichiometry of the coloured species is determined to be 1:5 ratios (uraniumoxalohydroxamic acid). A calibration graph is made for the concentration range of uranium from 10-100 mg/L. The molar absorption coefficient at 381nm, detection limit and Sendell’s sensitivity are 2230 LMol-1cm-1, 11 mg/L and 0.11 μg/cm2 respectively. Relative standard deviation is less than 2% and correlation coefficient is 0.998. In these studies, oxalohydroxamic acid complex with uranium, effect of reagent-metal ratio, pH and reagent stabilities are investigated. The results obtained by the proposed procedure are in good agreement with those obtained by the standard procedure. The advantage of the present study is that, it does not generate analytical waste b...

Research paper thumbnail of Synthesis of blue fluorescent carbon dotsfor sensitive and selective detection of glucose in biological samples

IOP Conference Series: Materials Science and Engineering

Research paper thumbnail of Hydroxamic Acids as a Reductometric Titrants: Determination of Cerium in Alloys

Hydroxamic acids like acetohydroxamic acid (AHA) and oxalohydroxamic acid (OHA) have been employe... more Hydroxamic acids like acetohydroxamic acid (AHA) and oxalohydroxamic acid (OHA) have been employed as a reductometric titrant for the determination of cerium in 2 N sulphuric acid. Stoichiometry of the reaction is established. One mole of AHA and OHA were found to consume 6.0 and 12.0 equivalents of the oxidant respectively in these reactions. The titre values are obtained by second derivative plots of potentiometric titrations.