期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 579, 期 -, 页码 412-424出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.06.073
关键词
Dual functional beta-MnO2 mesh; Fast and ambient degradation of dye; PMS activation; Oil removal; Catalytic mechanism
资金
- National Natural Science Foundation [51173099]
Dual functional membranes that can simultaneously remove water-insoluble oil and degrade water-soluble dyes have received considerable attention. Nevertheless, there remain arduous challenges due to the critical restriction of slow degradation rate and the heavy dependence on external stimuli like light, electricity or heat. Herein, we report a superwetting and rapidly catalytic beta-MnO2 mesh prepared by one-step hydrothermal method. In activation of peroxymonosulfate (PMS), this beta-MnO2 mesh can expeditiously degrade dyes without any external stimuli and simultaneously remove oils. The removal efficiencies were all > 99% and the filtrates were proved eco-friendly through leaching test and toxic experiment. Furthermore, a mechanism on the excellent catalytic ability of beta-MnO2 mesh was proposed, i.e. H+ was immobilized in 1 x 1 tunnel of beta-MnO2, which made the mesh surface a positive zeta potential and attract more negative sulfate radicals, as a result inducing an improved degradation efficiency. Therefore, we anticipate this bifunctional and ingenious beta-MnO(2 )mesh can contribute a lot to prompt and mild sewage purifications. (C) 2020 Elsevier Inc. All rights reserved.
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