Algal blooms have become a widespread concern for drinking water production, threatening ecosystems and human health. Photocatalysis, a promising advanced oxidation process (AOP) technology for wastewater treatment, is considered a potential measure for in situ remediation of algal blooms. However, conventional photocatalysts often suffer from limited visible-light response and rapid recombination of photogenerated electron-hole pairs. In this study, we prepared a Z-scheme AgBr/NH-MIL-125(Ti) composite with excellent visible light absorption performance using co-precipitation to efficiently inactivate . The degradation efficiency of AgBr/NH-MIL-125(Ti) for chlorophyll was 98.7 % after 180 min of visible light irradiation, significantly surpassing the degradation rate efficiency of AgBr and NH-MIL-125(Ti) by factors of 3.20 and 36.75, respectively. Moreover, the removal rate was maintained at 91.1 % even after five times of repeated use. The experimental results indicated that superoxide radicals (•O) were the dominant reactive oxygen species involved. The photocatalytic reaction altered the morphology and surface charge of algal cells, inhibited their metabolism, and disrupted their photosynthetic and antioxidant systems. In conclusion, this study presents a promising material for the application of photocatalytic technology in algal bloom remediation.

中文翻译：

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使用具有优异可见光吸收的 Z 型 AgBr/NH2-MIL-125(Ti) 光催化剂高效去除铜绿微囊藻：性能见解和机制


藻类大量繁殖已成为饮用水生产的普遍问题，威胁着生态系统和人类健康。光催化是一种很有前景的废水处理高级氧化工艺（AOP）技术，被认为是原位修复藻华的潜在措施。然而，传统的光催化剂经常受到有限的可见光响应和光生电子空穴对的快速复合的影响。在本研究中，我们利用共沉淀法制备了具有优异可见光吸收性能的Z型AgBr/NH-MIL-125(Ti)复合材料，以有效地灭活。可见光照射180 min后，AgBr/NH-MIL-125(Ti)对叶绿素的降解效率为98.7 %，明显超过AgBr和NH-MIL-125(Ti)的降解效率3.20和36.75倍， 分别。而且，即使重复使用5次，去除率仍保持在91.1%。实验结果表明，超氧自由基（·O）是主要的活性氧物种。光催化反应改变了藻类细胞的形态和表面电荷，抑制了它们的新陈代谢，并破坏了它们的光合作用和抗氧化系统。总之，这项研究为光催化技术在藻华修复中的应用提供了一种有前途的材料。