Synthesis of Visible Light Response S-SnO2 Catalyst for Optimized Photodegradation of Bromophenol Blue.

In the presence study, sulfur doped tin dioxide (S-SnO2) catalysts have been synthesized by precipitation of aqueous SnCl4 in the present of NH3. The synthesized catalysts have been characterized by scanning electron microscopy (SEM), Fourier transform infrared spectrometry (FTIR) energy dispersive x-ray (EDX) and x-ray diffraction (XRD). The photocatalytic performance of the synthesized S-SnO2 catalysts was optimized for bromophenol blue (BPB) degradation under visible light irradiation based on central composite design (CCD). Input variables adopted for the optimization are catalysts dosage, initial concentration of bromophenol blue and pH. Optimal conditions for the efficient BPB photodegradation were found to involve catalyst dosage of 0.4 g/L, initial BPB concentration of 5 mg/L and pH 8 under which maximum percentage degradation of 92.33% BPB degradation over 0.4g S-SnO2 was attained for 120 min visible light irradiation. sonication time of 60 min. Thus, the 0.4g S-SnO2 sample prepared under the founded optimal dopant amount yielded the maximal removal efficiencies.