树脂负载Fe^3＋／Cu^2＋多相类芬顿降解染料橙黄

Degradation of Orange IV dye solution catalyzed by Fe^(3+)/Cu^(2+) loaded resin in the presence of H_2O_2

制备了新型多相类Fenton催化剂(Fe3++Cu2+)/R(Fe3+和Cu2+同时负载于离子交换树脂),以橙黄Ⅳ为研究对象,探讨了初始过氧化氢浓度、橙黄Ⅳ浓度、催化剂量、初始pH值及温度等因素对催化反应速率的影响,并对该催化剂重复使用性能进行测试.研究结果表明,该催化剂(Fe3++Cu2+)/R与Fe3+/R相比表现出更好的催化过氧化氢分解的活性,使橙黄Ⅳ的降解率提高10%;催化过氧化氢氧化橙黄Ⅳ的反应遵循假一级反应动力学,反应活化能为10.71kJ.mol-1;催化剂表现出良好的重复使用性能,Fe3+和Cu2+在树脂表面负载比较牢固,具有较好的稳定性和耐用性.同时,电子顺磁共振(EPR)测试结果表明,Cu2+的掺杂能有效地促进OH.的产生;X射线光电子能谱(XPS)测试结果表明,反应过程中存在高价态铁物种.因此,在该体系反应过程中产生的活性物种是OH.和高价态铁同时共存.

A new heterogeneous catalyst, Fe^3＋/Cu^2＋/R where Fe^3＋ and Cu^2＋ were exchanged into cationic exchange resin DO01 （R）, was prepared which had a better catalytic reactivity to decompose H2O2 than Fe^3＋/ R. The removal rate of Orange IV increased 10% with this catalyst compared with Fe^3＋ / R. The effect of the initial concentration of H2O2 , the initial dye concentration, the catalyst dosage, the initial pH and temperature on the reaction rate constant was also studied. The reaction follows pseudo-first-order kinetics. The activation energy for Fe^3＋/Cu^2＋/R catalyzed oxidation of the dye was determined to be 10.71 kJ·mol^-1. Repeated use of catalyst did not decrease the removal rate of Orange IV. EPR （electron paramagnetic resonance） showed that the addition of Cu^2＋ into the catalyst of Fe^3＋/ R could effectively enhance the formation of OH. XPS （ X-ray photoelectron spectroscopy） measurements showed that a ferryl species was formed during the reaction. So the reactive intermediates for this reaction were both OH. and ferryl species.