Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 292, Issue -, Pages 9-18Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2015.01.032
Keywords
Ag3PO4-GO; Visible light photocatalysis; 2,4-Dichlorophenol; Degradation intermediates; Photocatalytic mechanism
Categories
Funding
- Postgraduate Innovative Research Project of Hunan Province [CX2014B269]
- Open Foundation of the Innovation Platform in Higher Education of Hunan Province [11k070]
- Science and Technology Project of Hunan Provincial Science & Technology Department [201393071]
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A series of visible-light responsive photocatalysts prepared using Ag3PO4 immobilized with graphene oxide (GO) with varying GO content were obtained by an electrostatically driven method, and 2,4-dichlorophenol (2,4-DCP) was used to evaluate the performance of the photocatalysts. The composites exhibited superior photocatalytic activity and stability compared with pure Ag3PO4. When the content of GO was 5%, the degradation efficiency of 2,4-DCP could reach 98.95%, and 55.91% of the total organic (TOC) content was removed within 60 mm irradiation. Meanwhile, the efficiency of 91.77% was achieved for 2,4-DCP degradation even after four times of recycling in the photocatalysis/Ag3PO4-GO (5%) system. Reactive species of O-2(center dot-), OH center dot and h(+) were considered as the main participants for oxidizing 2,4-DCP, as confirmed by the free radical capture experiments. And some organic intermediates including 4-chlorophenol (4-CP), hydroquinone (HQ), benzoquinone (BZQ), 2-chlorohydroquinone and hydroxyhydroquinone (HHQ) were detected by comparison with the standard retention times from the high performance liquid chromatography (HPLC). In short, the enhanced photocatalytic property of Ag3PO4-GO was closely related to the strong absorption ability of GO relative to 2,4-DCP, the effective separation of photogenerated electron-hole pairs, and the excellent electron capture capability of GO. (C) 2015 Published by Elsevier
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