A preliminary study on the effect of Copper nanoparticles on certain pesticides
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Date
2019-07
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Nanoparticles are gaining a lot of attention worldwide owing to their unique physical and chemical properties, high surface area and nanoscale size etc. Present thesis work deals with the synthesis and application of Cu NP’s. In order to obtain stable, controlled size and size distribution, Cu NPs were synthesized via chemical reduction method by controlling various reaction parameters. The synthesized nanoparticles were used to prepare stable suspension of nanoparticles. Further, suspensions of NPs were also prepared using as procured Cu NP’s by optimizing the amount of different solvents viz. acetonitrile, isopropanol, kerosene and transformer oil and surfactant i.e. oleic acid. The prepared nanosuspension were characterized using UV-VIS and FTIR spectroscopy which confirmed the formation of stable Cu nanosuspension. It turned out that Oleic acid, used in specific amounts, can act as an excellent surfactant for Cu NPs however, it was not sufficient to prevent the oxidation of NPs. To study the application of Cu NP’s in pesticide degradation, solution of different concentrations of chlorpyrifos, dichlorvos and endosulfan were prepared. The prepared pesticide solutions were added to specific amounts of Cu nanosuspension and monitored with time. Change in colour was observed for all the samples giving a colorimetric method to study the effects of NP’s on pesticides. The reaction products of pesticides were characterized using UV-VIS and FTIR spectroscopy. The UV-VIS plasmon of nanosuspension showed red shift while the absorbance band of pesticides disappeared after reaction. The FTIR spectra confirmed the degradation of organic bonds of the pesticides. The pesticides have been successfully degraded by Cu NP’s as a result of their adsorption on NP’s surface and interaction between them.
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