Biosynthesis and Biosorption Potential of AgNPs from A. Indica Extract for Removal of Cr (VI)
Publication: Journal of Hazardous, Toxic, and Radioactive Waste
Volume 28, Issue 4
Abstract
The objective of the present study was the biosynthesis of nonhazardous and cost-effective silver nanoparticles (AgNPs) using plant extracts of Azadirachta indica (neem), for the removal of hexavalent chromium [Cr (VI)] ions from an aqueous solution. Fourier transform infrared (FT-IR) and energy dispersive X-ray (EDX) spectroscopy characterization results confirmed successful biosynthesis and the presence of elemental silver in the AgNPs. Further, scanning electron microscopy (SEM) and particle size analysis indicated that AgNPs have an amorphous structure and are highly monodispersed. Batch adsorption studies were conducted to investigate the impact of parameters, like pH, time, and initial concentration on Cr (VI) removal efficiency at a fixed AgNP dose of 50 mg and 150 rpm. From the batch study, maximum chromium removal of 87.68% was achieved at an initial concentration of 5 mg/L, pH of 1, and time of 50 min. Results from equilibrium and kinetic study indicated pseudo-second-order reactions kinetics with monolayer coverage. The maximum adsorption capacity of 7.2 mg/g was obtained at an equilibrium time of 50 min and temperature of 30°C. These synthesized AgNPs also displayed significant antibacterial activity against both Gram-positive Bacillus subtilis and Gram-negative Escherichia coli. Based on the results obtained, biosynthesized AgNPs from extracts of A. indica could be utilized for the removal of water pollutants.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors are thankful to Guru Gobind Singh Indraprastha University (GGSIPU), Dwarka, New Delhi, India, for financial support from FRGS/GGSIPU (1223/33/2022-23) to carry out the research work in the concerned area.
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Journal of Hazardous, Toxic, and Radioactive Waste
Volume 28 • Issue 4 • October 2024
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© 2024 American Society of Civil Engineers.
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Received: Jun 22, 2023
Accepted: Nov 14, 2023
Published online: May 24, 2024
Published in print: Oct 1, 2024
Discussion open until: Oct 24, 2024
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