期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 198, 期 2-3, 页码 144-149出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2008.03.001
关键词
azo dye; photo-Fenton process; color removal; hydrogen peroxide; iron salt counter ion
The effect of chloride, sulfate and nitrate anions on the color removal of water containing the azo-dye reactive blue 69 (RB69) in acidic solution, by using photo-assisted Fenton process with Fe(II)/H2O2 and Fe(III)/H2O2 systems was investigated. Experiments were conducted in a batch reactor irradiated during 5 h with a domestic 15 W lamp with emission in the visible spectra. Experimental results showed color disappearance in the first 5 min of reaction in the photo-assisted process for all of the different salts, greatly enhancing the reaction rate with respect to the corresponding systems under dark conditions. The exception of the general trend was the Fe-2(SO4)(3)/H2O2/UV system, where the decolorization process is slower probably because the oxidative species generated by rupture of Fe(III)-peroxo complexes are less reactive. Total organic matter depletion and mineralization of the effluent were also tested during the experimental runs by means of total organic carbon (TOC) showing that, for most of the photo-assisted experiments high mineralization was reached after 3 h of reaction. (C) 2008 Elsevier B.V. All rights reserved.
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