SYME'I[ESIS, CHARACTERIZATION AND APPLICATIONS OF ZnS NANOPARTICLES

Abstract

Nanoparticle based materials find a lot of interest as antibacterial agents. ZnS nanoparticles are exhibit excellent antibacterial effect. Here we present our studies on synthsis, characterization and photocatalytic property of mercury doped and nitrogen doped ZnS nanoparticles and compared with undoped ZnS nanoparticles. The photocatalytic property was studied by determining antibacterial activity of Hg-doped ZnS and dye degradation ability of 1-Igdopcd ZnS and N-doped ZnS nanoparticles. The ZnS nanoparticles were synthesized by chemical precipitation method. The synthesized nanoparticles were characterized by an array of techniques, namely, IJV-Visible spectroscopy, Diffuse Reflectance Spectroscopy (DRS) and fluorescence spectroscopy, X-ray diffractometry (XRD) analysis, Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray Analysis (EDAX) and Transmission electron microscopy (TEM). In our study we also reported reactive oxygen species (ROS) mediated membrane lipid oxidation of E. coil treated with Hg doped and undoped ZnS. The antibacterial effects of these ZnS NPs were studied by measuring the growth curve of E. coil cells of K-12 strain, in which mercury doped ZnS NPs showed enhanced antibacterial activity compared to undoped ZnS NPs. The results of antibacterial studies and their possible mechanism have been discussed in this work. Dye degradation studies were carried out by monitoring decolorization of methyl blue by treating photocatalyst of different photocatalyst concentration. Degradation kinetic studies were done by using both photocatalysts by recording absorbance of decolorized dye by UV-visible spectroscopy