在这个实验中,采用水热法合成了Bi2Sn2O7/ZnO复合光催化材料,SEM,和EDS,等。所制备的Bi2Sn2O7/ZnO具有纳米棒构造和较高的相纯度。Bi2Sn2O7/ZnO在可见光下对细菌和真菌的光催化抗菌性能明显优于单一的Bi2Sn2O7和ZnO。特别是,1000mg/L1:3的Bi2Sn2O7/ZnO对大肠杆菌的抑菌率达97%以上,金黄色葡萄球菌,和白色念珠菌,在自然界中广泛存在。选择自由基捕获实验并研究其抗菌机理,结果表明,Bi2Sn2O7/ZnO体系的抗菌过程受·OH等自由基的调控,h+,和e-,这是由其独特的光催化活性产生的。最后,MTT细胞毒性实验表明,Bi2Sn2O/ZnO复合材料对细胞没有毒性。此外,实验研究了Bi2Sn2O7/ZnO对实际畜禽废水的抗菌性能,以及制备的Bi2Sn2O7/ZnOPCL复合抗生素膜在可见光下对鲜切水果表面进行抗菌处理的实际应用。本研讨为Bi2Sn2O7/ZnO作为光催化抗菌剂供给了新的思绪。
In this experiment, Bi2Sn2O7/ZnO composite photocatalytic materials were synthesized by a hydrothermal method and characterized by XRD, SEM, and EDS, etc. The prepared Bi2Sn2O7/ZnO has a nanorod structure and high phase purity. The photocatalytic antimicrobial performance of Bi2Sn2O7/ZnO against bacteria and fungi under visible light was significantly better than that of single Bi2Sn2O7 and ZnO. In particular, 1000 mg/L 1:3 Bi2Sn2O7/ZnO showed an antimicrobial rate of more than 97% against Escherichia coli, Staphylococcus aureus, and Candida albicans, which are widely present in the nature. The free radical trapping experiments were selected and the antimicrobial mechanism was investigated, and the results showed that the antimicrobial process of the Bi2Sn2O7/ZnO system was regulated by the free radicals such as ·OH, h+, and e-, which were generated by its unique photocatalytic activity. Finally, MTT cytotoxicity experiments demonstrated that the Bi₂Sn₂O₇/ZnO composite was not toxic to cells. In addition, the antimicrobial performance of Bi2Sn2O7/ZnO on real livestock wastewater and the real-life application of the prepared Bi2Sn2O7/ZnO PCL composite antibiotic film for antimicrobial treatment of freshly cut fruits\' surfaces under visible light were experimentally investigated. This study provides a new idea for Bi2Sn2O7/ZnO as a photocatalytic antimicrobial agent.