School of Water and Environment, Chang'an University, Xi'an, Shaanxi, 710054, PR China; Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Xi'an, 710054, China.
School of Water and Environment, Chang'an University, Xi'an, Shaanxi, 710054, PR China; Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Xi'an, 710054, China.
J Environ Manage. 2023 Oct 1;343:118210. doi: 10.1016/j.jenvman.2023.118210. Epub 2023 May 23.
Developing a high-performance method that can effectively control pollution caused by low concentrations of antibiotics is urgently needed. Herein, a novel three-dimensional PPy/ZnInS nanoflower composites were prepared for the comprehensive treatment of low-concentration tetracycline (Tc) hydrochloride in wastewater based on the adsorption/photocatalysis of ZnInS and the conductivity of PPy. In this preparation method, adsorption enrichment and photocatalytic regeneration were conducted in two steps, eliminating the dilution and dispersion effects of aqueous solvents on photocatalytic species and antibiotics. Results showed that ZnInS could effectively adsorb 87.85% of Tc at pH of 4.5 and photocatalytically degrade Tc at pH of 10.5. Although the adsorption capacity of ZnInS was slightly reduced after being combined with PPy, its photocatalytic efficiency was substantially enhanced. Specifically, 0.5%PPy/ZnInS could degrade 99.92% of the surface-enriched Tc in 1 h and induce the regeneration of the adsorption sites. Furthermore, the adsorption capacity remained above 85% even after recycling PPy/ZnInS ten times. The photocatalytic degradation mechanism analysis revealed that the enrichment of Tc on 0.5%PPy/ZnInS negatively impacts the photocatalytic efficiency, while •O and •OH radicals were the main oxidative species that played an important role in the photoregeneration process.
开发一种能够有效控制低浓度抗生素污染的高性能方法是迫切需要的。在此，基于 ZnInS 的吸附/光催化作用和 PPy 的导电性，制备了一种新型的三维 PPy/ZnInS 纳米花复合材料，用于综合处理废水中低浓度盐酸四环素（Tc）。在这种制备方法中，吸附富集和光催化再生分两步进行，消除了水溶剂对光催化物种和抗生素的稀释和分散作用。结果表明，在 pH 值为 4.5 时，ZnInS 能够有效地吸附 87.85%的 Tc，并在 pH 值为 10.5 时光催化降解 Tc。虽然 ZnInS 与 PPy 结合后吸附容量略有降低，但光催化效率却有显著提高。具体来说，0.5%PPy/ZnInS 在 1 小时内可以降解 99.92%的表面富集 Tc，并诱导吸附位点的再生。此外，即使在回收 PPy/ZnInS 十次后，其吸附容量仍保持在 85%以上。光催化降解机制分析表明，Tc 在 0.5%PPy/ZnInS 上的富集会降低光催化效率，而 •O 和 •OH 自由基是在光再生过程中起重要作用的主要氧化物种。
