异相Fenton催化水污染控制

Heterogeneous Fenton Catalytic Oxidation for Water Treatment

高级氧化技术(AOPs)是当前水处理研究领域的热点问题。异相Fenton催化氧化是一种极具代表性的高级氧化技术,其反应过程中产生的羟基自由基(·OH)等活性氧物种可以无选择性地攻击有机污染物,将有机大分子逐步分解为小分子物质,从而达到高效去除废水中有毒有害污染物的目的。相比均相Fenton反应,它具有pH响应范围广、不产生铁泥、催化剂可循环利用等优点。然而,由于固相催化剂的本征特性和局限性,当前所研究的异相Fenton催化剂仍存在中性条件下活性低、过氧化氢(H2O2)利用率低、Fe(Ⅲ)/Fe(Ⅱ)转化速率不高等问题,难以实现异相Fenton催化在环境修复领域的大规模应用。本文综述了不同活性氧物种参与的异相Fenton反应机理,总结了多种异相Fenton催化剂及其在有机污染物控制方面的应用,为继续开展异相Fenton催化水污染控制研究提供参考。

Advanced oxidation technology(AOPs)is a hot issue in current water treatment research,such as the representative Heterogeneous Fenton catalytic oxidation.It can generate active oxygen species such as hydroxyl radicals(·OH)during the reaction,which attack organic pollutants unselectively and gradually decompose organic macromolecules into small molecules,achieving the efficient removing of toxic and harmful pollutants.Compared with homogeneous Fenton reactions,heterogeneous Fenton reactions have various advantages,such as wide pH response,recyclability of catalysts,and no generation of iron mud.However,considering their intrinsic characteristics and limits of solid-phase catalysts,there are still some problems inhibiting the large-scale application,such as low activity under neutral conditions,low utilization of hydrogen peroxide(H2O2),and low conversion rate of Fe(Ⅲ)/Fe(Ⅱ).This article summarizes the heterogeneous Fenton reaction mechanism involving different active oxygen species as well as various heterogeneous Fenton catalysts and their applications in control of organic pollutants and provides a reference for continuing research on heterogeneous Fenton catalysts.