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Zinc sulphide (ZnS) and Tin-doped Zinc sulphide (Sn-ZnS) nanoparticles (NPs) were synthesized by co precipitation method. The produced NPs were characterized using UV-Vis spectroscopy, XRD, EDX,SEM, FTIR, TGA and Photoluminescence (PL) spectroscopy. With the addition of 3% Sn the band gap of ZnS reduced from 3.50 to 3.10 eV. TGA study revealed that synthesized NPs are very stable to temperature and the total weight loss was only 22.8% and 21.5% in ZnS and Sn-ZnS nanocatalyst. The photoluminescence (PL) intensity showed that with Tin-doping the peak in Sn-ZnS shifted to longer wavelength. The degradation of Bromophenol blue over both catalysts followed first order kinetics. The activation energy calculated for the photodegradation reaction was 53.2 and 67.55 kj/mol using pure ZnS and Sn-ZnS NPs, respectively. About 86% and 96% dye degradation was noticed in 300 minutes. A high percentage of dye degradation was found at low concentration (10 ppm) and at optimal dosage (0.03 g) of the catalyst. The rate of Bromophenol blue dye degradation was found to increase with increase in temperature (up to 70°C) and pH (9.5) of the medium. Sn-ZnS NPs showed good antibacterial and antioxidant activities compared to bare ZnS. Both nanoparticles are found to be non biocompatible.

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