Preparation of Pd-ZnIn2S4-PVA-pumice supported catalyst and its performance on photocatalytic degradation of pharmaceuticals in water
Photocatalysis is an effective technology for the degradation of trace pharmaceuticals,such as carbamazepine(CBZ)and diclofenac(DCF),in aquatic environment.The development in supported photocatalyst can solve the problems of difficult recycling and easy to bring secondary pollution for powdery catalyst.In this study,a type of pumice supported catalyst was prepared by a hydrothermal synthesis and ultrasonic impregnation method,and the result confirmed that the adhesion of polyvinyl alcohol(PVA)was better than that of neutral silica sol(ZS-30),aluminium dihydrogen phosphate(Al(H2PO4)3)or polyethylene glycol 400(PEG-400).An ultrasonic oscillating method determined the shedding rate of 0.1％Pd-ZnIn2S4-PVA-pumice catalyst was 4％.Under the irradiation of iodine gallium light or sunlight,1.5 g·L-1 catalyst could result in 100％or 88.8％CBZ degradation efficiencies,respectively,with 50 mL reaction solution and CBZ initial concentration of 100 μg·L-1.The photocatalytic degradation of CBZ followed a pseudo first-order reaction kinetics.PVA connected with 0.1％Pd-ZnIn2S4 by hydrogen bond,and the crystal defects were successfully introduced onto the surface of the photocatalyst.CBZ and DCF in solution were oxidized by both OH and O2-free radicals that produced on the catalyst surface under light irradiation.Above result can provide a reference for the real application of photocatalytic technology in the purification of aquatic environment that containing trace pharmaceuticals.
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