IJEP 41(7): 762-771 : Vol. 41 Issue. 7 (July 2021)
1. Pondicherry University, Centre for Pollution Control and Environmental Engineering, Puducherry – 605 014, India
2. University of Petroleum and Energy Studies, Environmental Research Institute, Dehradun – 248 007, India
The effect of several process parameters on the biomimetic synthesis of silver nanoparticles (AgNPs) using ubiquitous and pernicious aquatic weed water hyacinth (Eichhornia crassipes) was studied. Aqueous extracts of the plant across a wide range of concentrations were able to successfully induce AgNP formation as well as their stabilization. It was shown with the aid of UV-visible spectroscopic, electron microscopic and dynamic light scattering studies that by manipulating the extract-Ag (I) stoichiometry, temperature, pH and interaction time, different shapes and sizes of nanoparticles can be generated. Conditions under which optimum formation of AgNPs of different shapes and sizes could be achieved were worked out. The efficacy of the AgNPs in free radical scavenging and catalysis was witnessed. The studies thus provide a template for scaling up the AgNP synthesis and utilizing the AgNPs. Given the fact that E. crassipes is freely available in large quantities, with no other recognized use, the present method opens up a possibility for large-scale utilization of it in synthesizing AgNPs of tunable shapes and sizes in a rapid, non-polluting, energy frugal and inexpensive manner.
Silver nanoparticles, Water hyacinth, Eichhornia crassipes, Biomimetic synthesis, Antioxidant activity, Catalysis
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