【摘要】 随着工业化和城市化的快速发展,水源中的新兴污染物（如抗生素）对生态环境和人类健康构成了严重威胁,亟需开发高效、可靠的水处理技术.光催化高级氧化技术（AOPs）因其反应速率快、氧化能力强且环境友好,被认为是解决该问题的有效手段.然而,现有研究在废水处理的综合评估方面仍存在不足,特别是在降解路径、毒性评估及反应机理的深入解析方面亟待加强.本文设计并制备了一种新型的S型异质结光催化剂Mn_0.5Cd_0.5S/In₂S₃（MCS/IS）,用于高效降解抗生素污染物,重点考察了其对盐酸四环素（TCH）的去除效果.实验结果表明,优化的MCS/IS光催化剂在可见光下表现出卓越的光催化活性,对TCH的降解率显著提升,并展现出优异的抗无机阴离子干扰能力.此外,基于MCS/IS膜的连续流废水处理系统在长期运行中表现出出色的稳定性,为实际废水处理提供了可行的技术方案.通过响应面方法和Fukui函数分析,系统研究了催化剂用量、水体类型和污染物种类等反应条件对光催化降解速率的影响,并揭示了TCH降解的主要路径及关键中间产物.毒性评估结果表明,经过MCS/IS光催化处理后的出水对环境安全无显著生态毒性.进一步的机理研究表明, MCS/IS光催化剂中的S型异质结结构有效促进了光生电子-空穴对的分离,同时保留了强氧化性空穴和高还原性电子,从而显著提升了光催化性能.综上,本研究不仅为高效光催化剂的设计与合成提供了新思路,还通过系统的降解路径解析、毒性评估及机理研究,为光催化技术在环境治理中的应用奠定了坚实的科学基础.更多还原

【Abstract】 Emerging contaminants in water sources present serious environmental and health risks, creating an urgent need for efficient and reliable treatment strategies. Photocatalytic advanced oxidation processes（AOPs） provide rapid reaction rates and strong oxidation capabilities, however, comprehensive evaluations of wastewater treatment, including degradation pathways, toxicity assessments and mechanistic insights, remain underexplored in the literature. This study presents novel S-scheme Mn_0.5Cd_0.5S/In₂S₃（MCS/IS） photocatalysts for efficient degradation of antibiotic pollutants, with a particular focus on tetracycline hydrochloride（TCH）. The optimized MCS/IS photocatalyst demonstrates exceptional degradation efficiency and robust resistance to inorganic anions. Additionally, a continuous-flow wastewater treatment system, using an MCS/IS membrane, demonstrates outstanding stability in TCH photodegradation. Utilizing response surface methodology and Fukui function analysis, the effects of various parameters on photocatalytic degradation rates, along with the associated pathways and intermediate products, have been thoroughly investigated. Toxicity assessments confirm the environmental safety of the treated effluents. Mechanistic studies show that the S-scheme heterojunction in the MCS/IS photocatalyst improves electron-hole separation, thereby enhancing photocatalytic performance. It is expected that this study will serve as a model for advancing the removal of emerging contaminants, further enhancing photocatalytic AOPs as sustainable water purification technologies.更多还原