树脂负载Fe3+/Cu2+多相类芬顿降解染料橙黄

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10.71 kJ·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.

Degradation of Orange IV dye solution catalyzed by Fe3+/Cu2+ loaded resin in the presence of H2O2

A new heterogeneous catalyst, Fe3+/Cu2+/R where Fe3+ and Cu2+ were exchanged into cationic exchange resin D001 (R), was prepared which had a better catalytic reactivity to decompose H2O2 than Fe3+/ R. The removal rate of Orange IV increased 10% with this catalyst compared with Fe3+/ 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 Fe3+/Cu2+/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 Cu2+ into the catalyst of Fe3+/ 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.