期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 225, 期 -, 页码 40-50出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2017.11.045
关键词
Magnetic photocatalyst; Ag3PO4; NiFe2O4; Photo-Fenton; Degradation
资金
- National Natural Science Foundation of China [21777063, 21407065]
- Natural Science Foundation of Jiangsu Province for Youths [BK20140533]
- China Postdoctoral Science Foundation [2015T80514]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
A high-performance photocatalyst should be superior not only in light absorption and charge transfer but also surface catalytic reaction. Here we report a green and simple strategy for evenly decorating Ag3PO4 particles using magnetic NiFe2O4 nanoparticles (NPs). The NiFe2O4 NPs could act as a magnetic support material for recycling the photocatalysts, as well as in situ catalytically decompose the H2O2 produced on the surface of Ag3PO4 into O-2 center dot(-) and center dot OH radicals via a photo-Fenton process. The catalytic decomposition of H2O2 could produce strong oxidative capacity O-2 center dot(-) and center dot OH radicals for the organic pollutants degradation and reduce host semiconductor holes (h((Ag3PO4))(+)) consumption by these produced H2O2. Thus, the photocatalytic activities of Ag3PO4@NiFe2O4 composites were greatly enhanced. Taking the photocatalytic degradation of Methyl orange (MO), hardly decomposed colorless phenol compounds bisphenol A (BPA) and killing Escherichia coli (E. coli.) as mode photocatalytic reactions, this system exhibited superior photocatalytic performances than that of pristine Ag3PO4. Electron spin resonance (ESR) spectroscopy and sacrificial-reagent incorporated photocatalytic characterizations indicated that the in situ eliminating/active decomposition of H2O2 produced by Ag3PO4 was the main reason for the enhanced photocatalytic activities.
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