Photocatalytic water disinfection has been demonstrated as a promising technology for rapid water treatment in terms of utilizing sustainable solar energy. In this paper, C-doped CoFe₂O₄ magnetic nanoparticles (named C–CoFe) modified C–CoFe/Ag–AgX (X = Cl, Br, I) composites were synthesized via solvothermal process. The photocatalytic performance of the C–CoFe/Ag–AgX composites were evaluated by bacterial inactivation in aqueous solution under visible light irradiation; the results showed that the C–CoFe/Ag–AgX composites were able to inactivate E. coli with a low photocatalysts concentration. In comparison to pure Ag–AgX, the C–CoFe/Ag–AgX composites exhibited enhanced photocatalytic performance, in which the 5% C–CoFe/Ag–AgBr showed the most inactivate activities that can achieve rapid water disinfection with 7 log inactivation of Escherichia coli within 40 min under visible light. With the analysis and discussion of photoelectrochemistry test, ESR trapping experiments, H₂O₂ yield measurement, and O₂ control photocurrent response text, it was demonstrated that C–CoFe can work as a cocatalyst component in the C–CoFe/Ag–AgX composite to extract the photogenerated electrons and offer more oxygen activation sites to yield more reactive oxygen species (ROSs) for the photocatalytic inactivation. More importantly, the as-prepared C–CoFe/Ag–AgX composite possess magnetic properties which can be recovered easily by a magnetic field.

中文翻译：

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多功能C掺杂CoFe ₂ O ₄材料作为助催化剂，促进磁性可回收C-CoFe / Ag-AgX光催化剂上产生活性氧

就利用可持续太阳能而言，光催化水消毒已被证明是用于快速水处理的有前途的技术。本文通过溶剂热法合成了掺碳的CoFe ₂ O ₄磁性纳米粒子（命名为C-CoFe）改性的C-CoFe / Ag-AgX（X = Cl，Br，I）复合材料。通过在可见光照射下水溶液中的细菌灭活来评估C–CoFe / Ag–AgX复合材料的光催化性能。结果表明，C–CoFe / Ag–AgX复合材料能够灭活大肠杆菌。光催化剂浓度低。与纯Ag–AgX相比，C–CoFe / Ag–AgX复合材料表现出增强的光催化性能，其中5％C–CoFe / Ag–AgBr表现出最大的失活活性，可以通过7 log失活来实现快速的水消毒。大肠杆菌在可见光下40分钟内。通过对光电化学测试，ESR捕集实验，H ₂ O ₂产率测量和O ₂的分析和讨论对照光电流响应文本，证明了C–CoFe可以作为C–CoFe / Ag–AgX复合材料中的助催化剂成分来提取光生电子，并提供更多的氧活化位点，从而产生更多的活性氧（ROSs）。光催化失活。更重要的是，所制备的C-CoFe / Ag-AgX复合材料具有可通过磁场轻松恢复的磁性。