Green and chemical synthesis of cadmium selenide nanoparticles and their applications
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Date
2022
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UMT, Lhr
Abstract
Water pollution caused by antibiotic drugs leads to various environmental problems. It affects not only to those who consume contaminated water, but also to
aquatic life and other living organisms. Ciprofloxacin is globally used antibiotic for treating humans as well as animals, but its degradation is difficult which leads to its
accumulation in water resources. Various methods of degradation exist but among all most effective and cost-efficient method is photocatalysis, which use sunlight or UVradiations to initiate the degradation of drug/dye by generation of electron-hole pair over the surface of photocatalyst. Cadmium selenide semiconductor nanoparticles were synthesized by chemical and biosynthetic routes, using sol-gel method. The fabricated cadmium selenide nanoparticles had size ranges from 9-12nm, measured by the scanning electron microscopy. The shape of nanoparticles obtained by scanning electron microscopy were globular for chemically synthesized nanoparticles while, for green synthesized nanoparticles it gave distorted tubular shape. The elemental composition and crystal structures of nanoparticles were studied by the energy
dispersive X-ray spectroscopy and X-ray diffraction analysis, respectively. The spectra obtained by energy-dispersive X-ray spectroscopy confirmed the formation of
required nanoparticles with 36.71% percentage composition of cadmium and 20.61% of selenium for chemically synthesized nanoparticles, and 63% and 0.91% percentage composition of cadmium and selenium for green synthesized nanoparticles. The X-ray diffraction spectra gave crystal structure of fabricated nanoparticles with preferential axis of (101) and (002) planes for chemically and green synthesized nanoparticles, respectively. On degrading ciprofloxacin via fabricated nanoparticles of cadmium selenide, under irradiation of UV-lamp, chemical equilibrium attained at 120min for nanoparticles of both routes, and gave maximum degradation percentage of 46% at 120min under UV-lamp via chemically synthesized nanoparticles. This showed pristine nanoparticles of cadmium selenide had good potential for drug degradation, can enhance further from 46% via doping with other metallic nanoparticles. Appropriate modification of nanoparticles can enhance its efficiency for wastewater treatment at larger scale with better photocatalytic degradation.