多相芬顿催化水处理技术与原理

Heterogeneous Fenton Catalytic Water Treatment Technology and Mechanism

多相芬顿催化水处理技术是一种有效的降解水中有机污染物的方法。相比均相芬顿反应,它具有可循环利用、pH响应范围宽、不产生铁泥以及易于固液分离等优点。本文主要综述了经典芬顿反应机制、多相芬顿催化反应机制以及基于传统机理所发展起来的多相芬顿/类芬顿催化剂。总结了现存多相芬顿催化体系所存在的中性条件下活性低、催化剂稳定性差以及过氧化氢利用率低等瓶颈问题。重点介绍了针对这些问题所开发出的新型多相芬顿催化体系,包括单一铜反应中心催化体系和金属双反应中心催化体系。我们认为双反应中心催化体系实际上已经突破了经典芬顿反应概念,从电子分布极化理论出发,创造性地构建出具有电子高密度中心和低密度中心,实现了过氧化氢高效选择性还原和污染物高效氧化降解,解决了经典芬顿反应在实际水处理中的技术瓶颈问题。

Heterogeneous Fenton catalytic water treatment technology is an effective method for degradation of organic pollutants in water. Compared to the homogeneous Fenton reaction, it has the advantages of recyclability,wide pH response range,easy solid-liquid separation and non-production of iron sludge. This article mainly reviews the classical Fenton reaction mechanism,the heterogeneous Fenton reaction mechanism,and the developed heterogeneous Fenton/Fenton-like catalysts based on the basic mechanism. The bottleneck problems of the present heterogeneous Fenton system,including lowactivity under neutral condition,poor stability of the catalyst and lowutilization efficiency of H2O2,are summarized. Particularly,the emphasis is to introduce the developed newtype heterogeneous Fenton systems,including the one-center Cu-based Fenton-like system and the dual-center Fenton-like system,for solving the bottleneck problems. We think the dual-centerFenton-like system has actually broke the concept of the classical Fenton reaction,creating the electron-rich centers and electron-deficiency centers based on the polarization theory of electron distribution,which realizes the efficiently selective reduction of hydrogen peroxide and oxidative degradation of pollutants,solving the technical bottleneck problems of the classical Fenton reaction in water treatment.