Preparation of a Bi2MoO6/Bi2Sn2O7 Composite Photocatalyst and Its Photocatalytic Performance and Toxicity Test

In this study, a three‐dimensional(3D) hierarchical Bi2MoO6/Bi2Sn2O7 composite photocatalytic material was synthesized by a solvothermal method. It was proved that the photocatalytic activity of Bi2MoO6/Bi2Sn2O7 composites for the degradation of Rhodamine B(RhB) and Tetracycline (TC) was much higher than that of pure Bi2MoO6 and pure Bi2Sn2O7 under LED irradiation. Among them, Bi2MoO6/Bi2Sn2O7 had the best photocatalytic activity, and the photodegradation efficiency of RhB and TC reached 95.28 % and 87.45 %, respectively. After five cycles of degradation of RHB and TC solutions, the composite still maintained good photocatalytic activity. Through the free radical trapping experiment, it was concluded that O2− and h+ were the main active substances for the degradation of organic compounds by composite photocatalyst. Through the plant toxicity test, it was proved that the composite didn't affect the normal growth of the plant. Therefore, this study provides a new material for the treatment of organic wastewater in production and life, which has important environmental protection significance. The enhancement of activity is related to the Z‐type heterojunction active center formed by the composite of Bi2MoO6 and Bi2Sn2O7. The low‐cost Bi2MoO6/Bi2Sn2O7 catalyst obtained by semiconductor composite is superior to the single catalyst in overall degradation.