Biosynthesis of zinc oxide nanoparticles employing fruits peel waste and their efficiency for degrading malachite green dye
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Date
2021-09
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
One of the major challenges in the 21st century is to satisfy the human requirement of clean water. Discharge of several untreated chemical and biological pollutants has deteriorated the drinking water quality. To minimize the effects of toxic chemicals, biological reduction agents are being explored worldwide for nanoparticle fabrication. The present study was undertaken to assess the synthesis of Zinc oxide nanoparticles (ZnO NPs) from multiple fruits peel waste and their application for degradation of Malachite green dye. The fruit peels contain active biomolecules such as flavonoids, phenolic acids and alkaloids in large quantity. The synthesized nanoparticles were characterized using various techniques such as UV-Vis Spectroscopy, FT-IR), DLS, XRD analysi, FE-SEM and EDX. Precursors used in synthesis were Zinc nitrate hexahydrate and NaOH, method used was bio-reduction and the prepared nanoparticles were employed under different parameters for degradation of malachite green dye. The size range of nanoparticles obtained was within the range of 60-100nm as reported by FESEM. X-ray diffraction studies confirmed the crystalline nature of the nanoparticles. The maximum malachite green degradation, about 93.08% was obtained at pH 7, ZnO NPs concentration 150ppm and dye concentration 20ppm under solar irradiation. The results revealed that the pretreated mixed fruit peel waste is a promising resource for synthesizing nanoparticles due to the phytochemicals that act as good reducing and stabilizing agent, and can be further employed for the sake of environmental pollution remediation.