BiSnSbO6-ZnO composite photocatalytic material with type II heterojunction structure was synthesized by a simple solid-phase sintering method, it was characterized by XRD, UV-vis and PT methods. The photocatalytic antibacterial experiments were carried out under LED light irradiation. The experimental results showed that the photocatalytic antibacterial properties of BiSnSbO6-ZnO composites against bacteria and fungi were significantly stronger than those of single BiSnSbO6 and ZnO. Under light conditions, the antibacterial efficiencies of 500 mg/L BiSnSbO6-ZnO composites against E. coli, S. aureus and P. aeruginosa reached 99.63%, 100% and 100% for 6 h, 4 h and 4 h, respectively. The best antibacterial concentration of BiSnSbO6-ZnO composite against eukaryotic microorganism Candida albicans was 250 mg/L, and the antibacterial efficiency reached the highest 63.8% at 6 h. Antibacterial experiments were carried out on domestic livestock and poultry wastewater, which showed that the BiSnSbO6-ZnO composite photocatalytic material has broad-spectrum antibacterial activity against bacteria, and the antibacterial effect has species differences. Through the MTT experiment, it is proved that the prepared BiSnSbO6-ZnO composite photocatalytic material has no toxicity at the experimental concentration. According to the free radical scavenging experiment and SEM observation of the morphological changes of the bacteria after light treatment, the prepared BiSnSbO6-ZnO composite photocatalytic material can generate active species ·OH, h+ and e− through light irradiation to achieve the purpose of sterilization, where e− play a major role, indicating that the BiSnSbO6-ZnO composite photocatalytic material has broad application prospects in the actual antibacterial field.
In this study, a three-dimensional(3D) hierarchical Bi 2 MoO 6 / Bi 2 Sn 2 O 7 composite photocatalytic material was synthesized by a solvothermal method. It was proved that the photocatalytic activity of Bi 2 MoO 6 /Bi 2 Sn 2 O 7 composites for the degradation of Rhodamine B(RhB) and Tetracycline (TC) was much higher than that of pure Bi 2 MoO 6 and pure Bi 2 Sn 2 O 7 under LED irradiation. Among them, Bi 2 MoO 6 /Bi 2 Sn 2 O 7 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 O 2 À 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.
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