Enhanced degradation of aqueous methyl orange by contact glow discharge electrolysis using Fe2+ as catalyst
Enhanced degradation of aqueous methyl orange by contact glow discharge electrolysis using Fe2+ as catalyst
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DOI：
10.1007/s10800-008-9626-z
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发表时间：
2008-07
影响因子：
2.9
通讯作者：
J. Gong;Juan Wang;Wei-jie Xie;W. Cai
中科院分区：
文献类型：
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作者：
J. Gong;Juan Wang;Wei-jie Xie;W. Cai
通过在溶液中添加少量Fe2+，采用接触辉光放电电解（CGDE）增强了水溶液中甲基橙的降解。当 CGDE 在施加 480 V 的直流电压和 65–80 mA 的电流下进行时，甲基橙被降解并最终分解为无机碳。氧化过程遵循一级动力学； Fe2+ 存在时，降解率几乎增加了八倍。根据高效液相色谱-质谱 (HPLC-MS) 溶液和中间产物的紫外 (UV) 光谱分析，提出了反应途径。 Fe2+催化剂促进的羟基自由基的加成是增强整个氧化过程的关键步骤。
The enhanced degradation of methyl orange in aqueous solution was achieved by means of contact glow discharge electrolysis (CGDE) through adding a small amount of Fe2+to the solution. Methyl orange was degraded and eventually decomposed into inorganic carbon when CGDE was carried out under an applied DC voltage of 480 V and a current of 65–80 mA. The oxidation process followed first-order kinetics; the degradation rate increased almost eight times in the presence of Fe2+. A reaction pathway is proposed based on analysis of the ultraviolet (UV) spectra of the solution and intermediate products from High Performance Liquid Chromatography-Mass Spectrometry (HPLC-MS). The addition of hydroxyl radicals promoted by the Fe2+catalyst is a key step in enhancing the whole oxidation process.