偶氮染料的草酸铁配合物/Na_2S_2O_8体系氧化降解  

Oxidative degradation of azo dye with Fe(Ⅲ)-oxalate complex/Na_2S_2O_8 system

作　　者：张丛灿 董永春[1,2] 李甫[1] 王鹏[1] 

机构地区：[1]天津工业大学纺织学院纺织化学与生态学研究中心,天津300387 [2]天津工业大学先进纺织复合材料重点实验室,天津300387

出　　处：《印染》2017年第8期1-6,共6页China Dyeing and Finishing

基　　金：江苏省创新创业人才项目资助(2015-340)

摘　　要：使用草酸铁配合物/Na_2S_2O_8体系对偶氮染料活性红195进行光催化氧化降解,考察了Na_2S_2O_8、Fe3+离子和草酸浓度,反应温度和辐射光等对染料降解性能的影响,并通过ESR分析和自由基淬灭试验研究了染料的氧化降解机理。结果表明,适当提高反应体系中Na_2S_2O_8、Fe^(3+)离子和草酸浓度,能够显著促进染料的降解反应;升高温度和引入辐射光有利于发挥草酸铁配合物/Na_2S_2O_8体系催化氧化的性能;无机盐的存在会抑制染料的降解反应,其中NaCl的抑制作用比Na_2SO_4更大。反应体系中存在HO·、SO_4^-·和O_2^-·三种自由基,其中HO·对染料降解反应的贡献最大。The degradation of azo dye Reactive Red 195 （RR195） is carried out with Fe（lll）-oxalate complex/Na2S20, system. Effects of initial concentration of Na2S2O8, Fe^3＋ ions and oxalate acid, reaction temperature as well as light irradiation on RR195 degradation are investigated. The degradation mechanism of RR195 is studied by ESR analysis and free radical scavenger test. The results indicate that increasing initial concentration of Na2S2O8, Fe^3＋ ions and oxalate acid can enhance RR195 degradation. The elevation of temperature and the introduction of light irradiation promote the catalytic degradation performance of Fe（Ⅲ）-oxalate complex/Na2S2O, system. The addition of inorganic salt can inhibit the degradation of RR195, and NaCI shows stronger inhibitory effect than Na2SO4. Three free radicals including HO., SO4- and O2^- are found in the degradation procedure, and HO- has much better contribution to RR195 degradation than the other two free radicals.

关 键 词：印染废水 草酸铁 过硫酸钠 偶氮染料 氧化降解 自由基 

分 类 号：O643.36[理学—物理化学] X791[理学—化学]