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研究报告

Enhanced degradation of acid red B by Fe²⁺ activated persulfate with polydopamine functionalized nonwovens cloth

摘要：为了提高Fe²⁺活化过硫酸盐（PS）过程中Fe²⁺的利用效率，降低其对自由基的淬灭作用.制备了聚多巴胺复合聚丙烯非织造布（PDA-PP），考察了PDA-PP材料应用于Fe²⁺/PS体系中，对酸性红B（ARB）的氧化降解性能和机理.结果表明：PDA-PP/Fe²⁺/PS体系能够更持续地活化PS氧化降解ARB.一方面聚多巴胺中酚羟基使Fe³⁺还原为Fe²⁺，保持对PS分解的持续性，另一方面聚多巴胺中的邻苯二酚和氨基对Fe²⁺的络合作用控制了Fe²⁺的释放速率，降低了Fe²⁺对自由基的淬灭.自由基淬灭实验与ESR分析结果表明，羟基自由基（·OH）是PDA-PP/Fe²⁺/PS体系的主要活性物种. （SO₄^·-）的产生量少于·OH.研究显示，PDA-PP的加入能有效提高Fe²⁺/PS体系中Fe²⁺的利用效率，降低自由基的淬灭作用，PDA-PP在重复使用5次后，催化体系依然保持催化性能.该研究在促进过硫酸盐催化氧化降解有机物方向具有一定的应用潜力.

Abstract：In this study， polydopamine composite polypropylene nonwovens （PDA-PP） were prepared and utilized in the process of Fe²⁺ activated persulfate （PS） to enhance the activation efficiency and reduce the quenching effect of Fe²⁺on free radicals. The performance and mechanism of acid red B （ARB） degradation by PDA-PP/Fe²⁺/PS were investigated. The results indicated that PS could continuously be activated by PDA-PP/Fe²⁺ for ARB catalytic degradation. The Fe³⁺ could be reduced to Fe²⁺ by phenolic hydroxyl group in polydopamine and active PS continuously. The complexation of catechol and amino group in polydopamine with Fe²⁺ could control the release of Fe²⁺and reduce the quenching of free radicals. The results of radical quenching experiments and ESR analysis showed that hydroxyl radical （·OH） is the main active species in PDA-PP/Fe²⁺/PS system. The yield of SO₄^·-is lower than ·OH. After the reuse of PDA-PP for 5 times， the PDA-PP/Fe²⁺/PS still maintains the catalytic performance. This study has a certain application potential on developing persulfate catalytic oxidation for organic compounds.