Abstract:

Compared to other treatment methods, Fenton technology is an effective method for the degradation of non-biodegradable organic pollutants in water due to the generated highly oxidative hydroxyl radicals(·OH). However, the application of traditional homogeneous Fenton reaction is limited by its narrow pH response range, difficult recovery and separation of the active components of the catalyst, and easily generated iron sludge that will cause secondary pollution. In recent years, the heterogeneous reaction, which can effectively overcome the above drawbacks and has good industrial application prospects, has attracted extensive attention and research. This article mainly summarizes the development of Fenton technology, especially for the heterogeneous ones from the aspects of reaction mechanism, influence of reaction parameters, and materials. The emphasis is given on the advances in heterogeneous catalysts particularly for the Fe-based ones, Fe-free metal ones, carbon-based ones with introduction of their synthesis method, structure-performance analysis, plausible reaction pathways and catalytic performance for organic degradation. Finally, the influence of catalysts stability, utilization of hydrogen peroxide and rate-limit step in the heterogeneous Fenton catalyst system are summarized, which provides ideas for further improving the rational design and fabrication method of heterogeneous Fenton catalysts.

Key words: Fenton-like catalysts, nanomaterials, radicals, multiphase reaction, waste water

摘要：

在众多水处理技术中，Fenton法能产生具有强氧化性的羟基自由基（·OH），被认为是处理水中难生物降解有机污染物的有效方法。但是，传统的均相Fenton技术存在响应pH范围窄、催化剂活性组分不易回收分离、产生的铁泥会造成二次污染等问题，而非均相Fenton技术则可有效克服上述缺陷并具有良好工业应用前景。本文评述了Fenton反应，尤其是非均相Fenton技术近年来的发展情况，主要综述了其反应机理、反应活性的影响因素以及非均相Fenton催化剂研究现状。重点结合构-效关系、合成方法与反应机制探讨了国内外铁基与非铁基金属催化剂与碳基催化剂的发展进程以及其对于难降解有机物的处理效果。并总结了双氧水利用率、催化剂稳定性、反应的控速环节对非均相Fenton催化剂体系应用的影响与限制，为进一步改进催化剂的设计与制备方法提供了思路。

关键词: 类Fenton催化剂, 纳米材料, 自由基, 多相反应, 废水