Optimization and Degradation Mechanism of Photocatalytic Removal of Bisphenol A Using Zn0.9Fe0.1S Synthesized by Microwave-assisted Method

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The sulfide photocatalyst of Zn0.9Fe0.1S was successfully synthesized by a facile microwave-assisted method, and Zn0.9Fe0.1S photocatalysts were characterized using SEM, EDX, XRD, and BET. The specific surface area of synthesized Zn0.9Fe0.1S is 78.1 m2·g-1 and total pore volume is 0.4 cm3·g-1. With bisphenol A (BPA) as a target pollutant, photocatalytic system of UV+Zn0.9Fe0.1S+H2O2 was set up. Some influencing parameters, including H2O2 dosage, initial pH value, initial concentration of BPA and Zn0.9Fe0.1S dosage, were investigated and the stability of the Zn0.9Fe0.1S was also studied during the photocatalysis. The optimum values of operating parameters were found at an initial pH value of 5.0, a H2O2 dosage of 0.15 mmol·L-1, and a Zn0.9Fe0.1S dosage of 0.08 g when the initial concentration of BPA was 10 mg·L-1. Under the optimal conditions, the highest removal rate of BPA achieved 95%. After seven consecutive reaction cycles, the degradation efficiency of BPA could still reach 85% and there was only a little dissolution of Zn2+ and Fe2+. Compared with the traditional photo-Fenton system, the UV+Zn0.9Fe0.1S+H2O2 system can not only improve the degradation efficiency of BPA, but also reduce the dosage of H2O2 and thus reduce the processing cost.