水溶性铁卟啉催化剂氧化降解水溶液中的偶氮染料,European Journal of Inorganic Chemistry

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水溶性铁卟啉催化剂氧化降解水溶液中的偶氮染料
European Journal of Inorganic Chemistry ( IF 2.2 ) Pub Date : 2021-06-03 , DOI: 10.1002/ejic.202100373
Tapan Kumar Saha _{1,

2} , Holm Frauendorf ₃ , Franc Meyer ₂

Affiliation

纺织和食品工业产生大量含有偶氮染料和其他污染物的废水。这些废水是严重的环境威胁，因此处理它们的新方法和降解偶氮染料的方法备受关注。目前的研究涉及在水溶液中由内消旋四（1-甲基吡啶鎓-4-基）prophyrinatoiron (III)、[Fe ^III (tmpyp)] 和间氯过氧苯甲酸 ( m -CPBA)氧化降解偶氮染料。室温下的溶液。通过使用快速扫描停流分光光度法作为溶液 pH、[催化剂]、[ m ] 的函数研究偶氮染料的催化降解-CPBA]、[染料] 和 [表面活性剂]。为了获得机理见解，还在没有偶氮染料的水溶液中研究了[Fe ^III (tmpyp)] 和m- CPBA之间的反应。光谱分析和动力学数据表明，[Fe ^III (tmpyp)]在 20-30 ms 内转化为瞬态中间体 [Fe ^IV (O)(tmpyp)] ^.+（化合物 I 类似物），然后形成相对稳定的[Fe ^IV (O)(tmpyp)]（化合物 II 类似物）。批量实验表明，染料降解速率受溶液 pH 值和 [Fe ^III (tmpyp)]、m浓度的影响-CPBA、染料和表面活性剂。在动力学和光谱数据的基础上，提出了染料降解反应的机理方案和稳态速率方程。已通过 HPLC-UV-HRMS 分析了由偶氮染料苋菜红氧化降解产生的产物。

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Oxidative Degradation of Azo Dyes in Aqueous Solution by Water-Soluble Iron Porphyrin Catalyst

Textile and food industries produce a significant volume of effluents containing azo dyes and other pollutants. These effluents are serious environmental threats, and new methods for their treatment and for the degradation of azo dyes are thus attracting much attention. The current study deals with the oxidative degradation of azo dyes by meso-tetrakis(1-methylpyridinium-4-yl)prophyrinatoiron(III), [Fe^III(tmpyp)], and meta-chloroperoxy benzoic acid (m-CPBA) in aqueous solution at room temperature. The catalytic degradation of azo dyes was investigated by using rapid-scan stopped-flow spectrophotometry as a function of solution pH, [catalyst], [m-CPBA], [dye] and [surfactants]. To obtain mechanistic insight, the reaction between [Fe^III(tmpyp)] and m-CPBA was also studied in aqueous solution in absence of azo dyes. Spectral analyses and kinetic data show that [Fe^III(tmpyp)] is transformed into the transient intermediate [Fe^IV(O)(tmpyp)]^.+ (a compound I analog) within 20–30 ms followed by the formation of relatively stable [Fe^IV(O)(tmpyp)] (a compound II analog). Batch experiments reveal that the dye degradation rate is influenced by the solution pH and the concentrations of [Fe^III(tmpyp)], m-CPBA, dye, and surfactants. On the basis of the kinetic and spectroscopic data, a mechanistic scheme for the dye degradation reaction and a steady-state rate equation are proposed. The products resulting from oxidative degradation of the azo dye amaranth have been analyzed by HPLC-UV-HRMS.

更新日期：2021-07-23

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