Reactive species in resin supported heterogeneous Fenton-like oxidation of Malachite green solution
ZHANG Ying-jie1, MA Jun1, ZHAO Ji1, LIU Xu-sheng1, SONG Lei2
1.School of Municipal and Environmental Engineering,National Engineering Research Center of Urban Water Resources,Harbin Institute of Technology, Harbin 150090,China;2.School of Chemical Engineering,Northeast Dianli University,Jilin 132012,China
Abstract:
During the oxidative degradation of nonbiodegradable Malachite green (MG) by means of H2O2 /FeⅢR (iron supported on ion-exchage resin) in a dynamic column,the binding energy of the Fe(2p3/2) region for XPS spectra was found to be different between the top layer and the bottom layer in this column. Based on the data from XPS spectra and DMPO-OH·signal by EPR spectra,it is shown that the formation of ferryl (Ⅳ) is the key step for the oxidation of MG. The ferryl (Ⅳ) species can oxidize MG,and its redox potential is about 0. 739 - 0. 803 V measured by cyclic voltammograms (CV) . The catalytic capability of ferryl (Ⅳ) species was also evaluated,and it is found that it can promote the decomposition of H2O2 more efficiently than ferric iron. The removal rate of MG mainly depends on the adsorption of catalyst. Both ferryl (Ⅳ) and HO·radicals are the reactive species in the system. The oxidation of HO·is only a small part of the overall removal rate. Based on the obtained results,a possible mechanism for a resin-supported Fenton-like oxidation reaction is proposed.
Key words: Fenton-like ferryl Malachite green hydroxyl radical
DOI：10.11916/j.issn.1005-9113.2010.02.019
Clc Number:X703
Fund:
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Reactive species in resin supported heterogeneous Fenton-like oxidation of Malachite green solution
本站小编 哈尔滨工业大学/2019-10-23
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