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污染控制技术及原理

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

摘要：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.

Abstract：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.