Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 404, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.124062
Keywords
G-C3N4@Mof; Heterojunction; Microcystis aeruginosa; Ag/AgCl@g-C3N4@UIO-66(NH2); Visible light
Categories
Funding
- National Natural Science Foundation of China [51778146, 51778082]
- Outstanding Youth Fund of Fujian Province in China [2018J06013]
- Technical Research Project of Shenzhen Municipal Science and Technology Innovation Commission in China [20170422]
- Open Project Program of National Engineering Research Center for Environmental Photocatalysis [201901]
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A novel Ag/AgCl@g-C3N4@UIO-66(NH2) heterojunction was constructed for photocatalytic inactivation of Microcystis aeruginosa under visible light. The nano-composite provides abundant active sites, enhances visible-light energy utilization, and effectively transfers charge carriers, leading to high removal efficiencies of cyanobacteria. The material exhibits excellent reusability and photocatalytic stability, with a proposed mechanism for Microcystis aeruginosa inactivation.
In this work, a novel Ag/AgCl@g-C3N4@UIO-66(NH2) 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 nano-composite 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-C3N4@UIO-66(NH2) exhibits excellent reusability and photocatalytic stability. Finally, a possible mechanism of M. aeruginosa inactivation was proposed. In a word, Ag/AgCl@g-C3N4@UIO-66(NH2) can efficiently inactivate cyanobacteria under visible light, thus providing useful references for further removal of harmful algae in real water bodies.
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