【摘 要】
：
During the oxidative degradation of nonbiodegradable Malachite green (MG) by means of H2O2/FeⅢ R (iron supported on ion-exchage resin) in a dynamic column, the
【机 构】
：
School of Municipal and Environmental Engineering,School of Chemical Engineering
【基金项目】
：
the National High Technology Research and Development Program of China(863 Program);the Natural Science Foundation of China under the Scheme of Innovation Group Fund
论文部分内容阅读
During the oxidative degradation of nonbiodegradable Malachite green (MG) by means of H2O2/FeⅢ R (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 H2 O2 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.
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