College of Environmental Science Engineering, Key Laboratory of Environmental Biology Pollution Control, Ministry of Education, Hunan University, Changsha 410082, China.
College of Environmental Science Engineering, Key Laboratory of Environmental Biology Pollution Control, Ministry of Education, Hunan University, Changsha 410082, China.
J Colloid Interface Sci. 2018 Feb 15;512:272-281. doi: 10.1016/j.jcis.2017.10.068. Epub 2017 Oct 17.
Novel Z-scheme AgI/BiVO photocatalysts were fabricated by a chemical deposition-precipitation approach. The photocatalytic activities of the obtained catalysts were evaluated by disinfection of Escherichia coli (E. coli) and degradation of oxytetracycline hydrochloride (OTC-HCl) under visible-light irradiation. The BA3 (contained 9.09% of AgI) exhibited the highest photocatalytic activity and maintained good stability. It could completely inactivate 7.0×10 CFU/mL of E. coli in 50 min and degrade 80% of OTC-HCl in 60 min. The enhanced photocatalytic activity of AgI/BiVO composites could be ascribed to the lower recombination rate of electron-hole pairs. Meanwhile, radical trapping experiments revealed that the superoxide radical (O) and holes (h) were the dominant reactive species in photo-disinfection process. Furthermore, the effects of bacterial initial concentration and inorganic anions were also investigated to optimize the photocatalyst for practical application. This study will give a new insight to construct the effective Z-scheme system for bacterial inactivation and organic pollutants degradation.
通过化学沉积-沉淀法制备了新型 Z 型 AgI/BiVO 光催化剂。通过可见光照射下大肠杆菌（E. coli）的消毒和盐酸土霉素（OTC-HCl）的降解来评估所获得的催化剂的光催化活性。BA3（含有 9.09%的 AgI）表现出最高的光催化活性，并保持良好的稳定性。它可以在 50 分钟内完全灭活 7.0×10 CFU/mL 的大肠杆菌，并在 60 分钟内降解 80%的 OTC-HCl。AgI/BiVO 复合材料光催化活性的增强可归因于电子-空穴对的复合率降低。同时，自由基捕获实验表明，超氧自由基（O）和空穴（h）是光消毒过程中的主要活性物质。此外，还研究了细菌初始浓度和无机阴离子的影响，以优化用于实际应用的光催化剂。这项研究将为构建有效的 Z 型体系以实现细菌失活和有机污染物降解提供新的思路。
