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Indexed by:期刊论文

Date of Publication:2012-02-01

Journal:CHEMICAL ENGINEERING JOURNAL

Included Journals:SCIE、EI

Volume:181

Page Number:189-195

ISSN No.:1385-8947

Key Words:Fe/TiO2; 2,4-Dichlorophenol; UV photocatalysis; Degradation; Mechanism

Abstract:A nano-catalyst Fe on TiO2 was prepared and tested for efficient total organic carbon (TOC) removal during the photocatalytic oxidation of chlorophenols. The preparation included a sol-gel process and calcinations followed by chemical reductive deposition of Fe. The Fe/TiO2 composite catalysts were more effective in dechlorination, oxidation of 2,4-DCP (2,4-dicholorophenol) and TOC removal, under UV irradiation, than pure Fe or pure TiO2. The catalysts were characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and UV-vis absorption spectroscopy. The loaded forms of iron include Fe, Fe2+ and FeOOH due to the reaction with oxygen. The Fe/TiO2 catalyst has significantly increased optical absorption than TiO2. The optimal pH value and iron loading content were determined to be pH 4 and 1 wt% Fe/TiO2, respectively. Degradation/dechlorination and TOC removal after 2 h irradiation with 297 mu W/cm(2) 254 nm UV were 97% and 71%, respectively. The possible reaction mechanisms are discussed. (C) 2011 Elsevier B.V. All rights reserved.