Zhang Ying-jie, Ma Jun, Chen Lei, Zhao Ji, Wu Pei-ying
School of Chemical Engineering, Northeast Dianli University, Jilin 132012, China.
Huan Jing Ke Xue. 2009 Dec;30(12):3609-13.
In order to increase the reaction rate of the heterogeneous Fenton-like oxidation, the catalyst of Fe3+ C2O4/R was used to catalytically decompose H2O2 for the removal of malachite green (MG) in aqueous solution under the visible light irradiation condition. The results show that the catalyst of Fe3+ C2O4/R has a better catalytic reactivity to enhance the formation of *OH compared with that of Fe3+ /R. The higher the concentration of H2O2, the faster the reaction rate is. This reaction follows pseudo-first-order kinetics, the reaction rate constant has a good relativity with the concentration of H2O. The catalyst of Fe3+ C2O4/R could decompose H2O2 to degrade MG effectively at pH 3-9, the optimum pH is 6. The removal rate of MG increased with the increase of the dosage of catalyst. With the increase of the concentration of MG, the removal of MG by the adsorption turned to be by the oxidation. Repeated uses of catalyst did not decrease the removal rate of MG. The ferryl and hydroxyl radicals are both the reactive species in the oxidation of MG.
为了提高非均相类芬顿氧化反应速率，采用Fe3+ C2O4/R催化剂在可见光照射条件下催化分解H2O2以去除水溶液中的孔雀石绿（MG）。结果表明，与Fe3+ /R相比，Fe3+ C2O4/R催化剂具有更好的催化活性，能增强*OH的生成。H2O2浓度越高，反应速率越快。该反应遵循准一级动力学，反应速率常数与H2O浓度具有良好的相关性。Fe3+ C2O4/R催化剂在pH 3-9范围内能有效分解H2O2以降解MG，最佳pH为6。MG的去除率随催化剂用量的增加而提高。随着MG浓度的增加，MG的去除方式从吸附转变为氧化。催化剂的重复使用并未降低MG的去除率。铁酰基和羟基自由基都是氧化MG的活性物种。
