利用具有优异可见光吸收能力的 Z 型 AgBr/NH2-MIL-125(Ti) 光催化剂高效去除铜绿微囊藻:性能见解与机理。

Journal of hazardous materials Pub Date : 2024-10-05 Epub Date: 2024-08-08 DOI:10.1016/j.jhazmat.2024.135461
Xingfeng Cao, Gongduan Fan, Jing Luo, Ling Zhang, Shiyun Wu, Yixin Yao, Kai-Qin Xu
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引用次数: 0

摘要

藻华已成为饮用水生产中的一个普遍问题,威胁着生态系统和人类健康。光催化是一种用于废水处理的前景广阔的高级氧化工艺(AOP)技术,被认为是就地修复藻华的潜在措施。然而,传统的光催化剂通常对可见光的反应有限,而且光生电子-空穴对会迅速重组。在本研究中,我们利用共沉淀法制备了一种具有优异可见光吸收性能的 Z 型 AgBr/NH2-MIL-125(Ti) 复合材料,以高效灭活铜绿微囊藻。在可见光照射 180 分钟后,AgBr/NH2-MIL-125(Ti) 对叶绿素 a 的降解效率为 98.7%,分别比 AgBr 和 NH2-MIL-125(Ti) 的降解率效率高出 3.20 倍和 36.75 倍。此外,即使重复使用五次,其去除率仍能保持在 91.1%。实验结果表明,超氧自由基(-O2-)是主要的活性氧。光催化反应改变了藻细胞的形态和表面电荷,抑制了它们的新陈代谢,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前景广阔的材料。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
High-efficiency removal of microcystis aeruginosa using Z-scheme AgBr/NH2-MIL-125(Ti) photocatalyst with superior visible-light absorption: Performance insights and mechanisms.

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/NH2-MIL-125(Ti) composite with excellent visible light absorption performance using co-precipitation to efficiently inactivate Microcystis aeruginosa. The degradation efficiency of AgBr/NH2-MIL-125(Ti) for chlorophyll a was 98.7 % after 180 min of visible light irradiation, significantly surpassing the degradation rate efficiency of AgBr and NH2-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 (•O2-) 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.

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