Study on Degradation of Carbamazepine by g-C3N4/Ag3PO4 Composite Photocatalyst Prepared by In-situ Deposition
QIAO Shuai1,2, ZHAO Chaocheng1,2, HE Fengting1,2, ZHAO Hongfei1,2, DONG Pei1,2, LIN Feifei1,2, TAI Zhaoxin1,2
1 Department of Chemical Engineering, China University of Petroleum(East China), Qingdao 266580, China 2 State Key Laboratory of Petroleum Pollution Control and Treatment, Beijing 102206, China
Abstract: The g-C3N4/Ag3PO4 composite photocatalyst was synthesized by in-situ deposition method. X-ray diffraction (XRD), scanning electron microscope (SEM), UV-Vis diffuse reflectance spectroscopy(DRS), X-ray photoelectron spectroscopy(XPS), photoluminescence spectroscopy (PL) and specific surface area analysis (BET) were used to characterize the synthesized samples. A possible formation mechanism of this heterostructure was investigated. Meanwhile, the photocatalytic oxidation performance of photocatalyst was tested with carbamazepine (CBZ) of 10 mg/L as the target pollutant. Compared with pure g-C3N4 and pure Ag3PO4, g-C3N4/Ag3PO4 composite photocatalyst exhibits superior photocatalytic ability. Among them, the CN/AP-0.5 composite photocatalyst with the theoretical mass ratio of g-C3N4 and Ag3PO4 of 1∶0.5 is the best. After 80 min of visible light illumination, the degradation rate of carbamazepine (CBZ 10 mg/L) can reach 80%, the catalytic performance is greatly improved compared with g-C3N4 monomer and Ag3PO4 monomer. Free radical trapping experiments show that in the process of photoca-talytic degradation of CBZ, the hole (h+) is the main active species.
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2020, Vol. 34 
