Fan Gongduan, Zhan Jiajun, Luo Jing, Lin Jiuyang, Qu Fangshu, Du Banghao, You Yifan, Yan Zhongsen
College of Civil Engineering, Fuzhou University, 350116 Fujian, China; State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, 350002 Fujian, China; Fujian Provincial Key Laboratory of Electrochemical Energy Storage Materials, Fuzhou University, 350002 Fujian, China.
College of Civil Engineering, Fuzhou University, 350116 Fujian, China.
J Hazard Mater. 2021 Feb 15;404(Pt B):124062. doi: 10.1016/j.jhazmat.2020.124062. Epub 2020 Sep 25.
In this work, a novel Ag/AgCl@g-CN@UIO-66(NH) heterojunction was constructed for photocatalytic inactivation of Microcystis aeruginosa (M. aeruginosa) under visible light. The photocatalyst was synthesized by a facile method and characterized by XRD, SEM, TEM, BET, XPS, FT-IR, UV-vis DRS, PL and EIS. The nanocomposite can not only provide lots of active sites, but also improve capacities to utilize visible-light energy and effectively transfer charge carriers, thus enhancing removal efficiencies of cyanobacteria (99.9% chlorophyll a was degraded within 180 min). Various factors in photodegradation of chlorophyll a were studied. Besides, changes on cellular morphologies, membrane permeability, physiological activities of M. aeruginosa during photocatalysis were investigated. Moreover, the cycle test indicated that Ag/AgCl@g-CN@UIO-66(NH) exhibits excellent reusability and photocatalytic stability. Finally, a possible mechanism of M. aeruginosa inactivation was proposed. In a word, Ag/AgCl@g-CN@UIO-66(NH) can efficiently inactivate cyanobacteria under visible light, thus providing useful references for further removal of harmful algae in real water bodies.
在本工作中，构建了一种新型的Ag/AgCl@g-CN@UIO-66(NH)异质结，用于在可见光下光催化灭活铜绿微囊藻（M. aeruginosa）。通过简便方法合成了光催化剂，并采用XRD、SEM、TEM、BET、XPS、FT-IR、UV-vis DRS、PL和EIS对其进行了表征。该纳米复合材料不仅能提供大量活性位点，还能提高利用可见光能量和有效转移电荷载流子的能力，从而提高蓝藻去除效率（180分钟内99.9%的叶绿素a被降解）。研究了叶绿素a光降解过程中的各种因素。此外，还研究了光催化过程中铜绿微囊藻细胞形态、膜通透性和生理活性的变化。而且，循环测试表明Ag/AgCl@g-CN@UIO-66(NH)具有优异的可重复使用性和光催化稳定性。最后，提出了铜绿微囊藻灭活的可能机制。总之，Ag/AgCl@g-CN@UIO-66(NH)能在可见光下有效灭活蓝藻，为实际水体中有害藻类的进一步去除提供了有益参考。
