非均相Fenton催化剂催化机理及性能提升策略综述

Catalytic mechanism and strategies for enhancing performance of heterogeneous Fenton catalysts:A review

非均相Fenton催化剂与过氧化氢反应可以产生高活性氧物种,具有对污染物降解速度快、催化剂易回收、适用pH范围广等优点,在去除有机污染物方面有广泛的应用前景。基于对以往研究的综合调查,综述了非均相Fenton催化剂在催化反应过程中涉及的主要机理,包括正负电中心类原电池机理、加速电子转移催化机理和氧空位作用机制,总结了近年来非均相Fenton工艺在动力学建模方面的最新研究,之后针对现有非均相Fenton催化体系中Fe^(2+)生成速率低、过氧化氢利用率低、催化剂稳定性差等瓶颈问题,分别从掺杂元素、改变催化剂结构、引入外部能量3个方面总结了提升非均相Fenton催化剂催化性能的策略方法,最后,指出了未来非均相Fenton催化剂的研究方向。

Heterogeneous Fenton catalyst can react with hydrogen peroxide to produce highly reactive oxygen species,which has the advantages of fast degradation rate of pollutants,easy catalyst recovery and wide applicable pH range.It has a wide application prospect in the removal of organic pollutants.Based on the comprehensive investigation of previous studies,this paper reviewed the main mechanisms involved in the catalytic reactions of heterogeneous Fenton catalysts,including positive and negative center reaction mechanism,accelerated electron transfer catalytic mechanism and oxygen vacancy mechanism.The research on dynamic modeling of heterogeneous Fenton processes in recent years was summarized.According to the catalytic mechanism,aiming at the bottleneck problems such as low Fe^(2+)generation rate,low hydrogen peroxide utilization rate and poor catalyst stability in the existing heterogeneous Fenton catalytic system,the strategies and methods to improve the catalytic performance of heterogeneous Fenton catalysts from three aspects including doping elements,changing catalyst structure and introducing external energy were summarized.Finally,the future research direction of heterogeneous Fenton catalyst was pointed out.