Abstract A novel Z-scheme Ag3PO4/g-C3N4 heterostructures was constructed successfully for Escherichia coli inactivation and organic pollutants degradation under visible light irradiation. The Ag3PO4(8)/g-C3N4 possessed the highest photocatalytic effect with more than 7 log of live Escherichia coli (E. coli) totally inactivated within 75 min and complete BPA degradation within 180 min. By mimicking the components of natural water individually, humic acid (HA) and inorganic anion were found to deeply affected the photocatalytic disinfection activity. Moreover, the Ag3PO4(8)/g-C3N4 revealed significantly boosted visible-light-driven photocatalytic performance for ciprofloxacin and sulfadiazine degradation. The satisfying degradation effects of bisphenol A in nature waters were also obtained. The improved photocatalytic efficiency of Ag3PO4/g-C3N4 may be attributed to the formation of Z-scheme heterostructure structure and matching valence band and conduction band, resulting in rapid separation of photo-induced carrier, enhanced electronic transport capacity and prolonged carrier lifetime. The possible mechanism was studied using radical quenching tests and electron spin resonance, suggesting that the hole, electron and hydroxyl radical were the paramount active species during Escherichia coli disinfection. This work pioneers a novel strategy for upgrading the photocatalytic disinfection and degradation capacities of g-C3N4 based catalysts.

中文翻译：

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具有增强的可见光驱动消毒和有机污染物降解的 Ag3PO4/g-C3N4 Z 型复合材料：揭示机制

摘要 成功构建了一种新型Z-scheme Ag3PO4/g-C3N4异质结构，用于可见光照射下大肠杆菌灭活和有机污染物降解。Ag3PO4(8)/g-C3N4 具有最高的光催化效果，超过 7 log 的活大肠杆菌 (E.coli) 在 75 分钟内完全灭活，并在 180 分钟内完全降解 BPA。通过单独模拟天然水的成分，发现腐植酸（HA）和无机阴离子对光催化消毒活性有很大影响。此外，Ag3PO4(8)/g-C3N4 显着提高了可见光驱动的环丙沙星和磺胺嘧啶降解的光催化性能。双酚A在天然水中的降解效果也令人满意。Ag3PO4/g-C3N4 光催化效率的提高可能归因于 Z 型异质结构的形成以及价带和导带的匹配，导致光生载流子的快速分离，增强了电子输运能力并延长了载流子寿命。使用自由基猝灭试验和电子自旋共振研究了可能的机制，表明空穴、电子和羟基自由基是大肠杆菌消毒过程中最重要的活性物质。这项工作开创了一种提高 g-C3N4 基催化剂光催化消毒和降解能力的新策略。增强的电子传输能力和延长的载体寿命。使用自由基猝灭试验和电子自旋共振研究了可能的机制，表明空穴、电子和羟基自由基是大肠杆菌消毒过程中最重要的活性物质。这项工作开创了一种提高 g-C3N4 基催化剂光催化消毒和降解能力的新策略。增强的电子传输能力和延长的载体寿命。使用自由基猝灭试验和电子自旋共振研究了可能的机制，表明空穴、电子和羟基自由基是大肠杆菌消毒过程中最重要的活性物质。这项工作开创了一种提高 g-C3N4 基催化剂光催化消毒和降解能力的新策略。