天然矿物催化氧化水中难降解有机污染物研究进展

An overview of natural mineral catalytic oxidation of refractory organic contaminants in wastewater

催化氧化技术具有氧化性强、矿化效率高等优点,是去除水中难降解有机污染物最有效的处理技术之一,催化剂的应用和研究是关注的热点,天然矿物催化剂储量大、价格低,在使用成本方面具有其他催化剂无可比拟的优势。本文综述了天然矿物催化剂在Fenton法、催化臭氧氧化法、活化过硫酸盐催化氧化法处理水中难降解有机污染物的研究进展和作用机理,分析了其反应条件、处理效果和催化活性位点等,指出含有丰富的金属元素的天然矿物可作为芬顿氧化和过硫酸盐氧化的催化剂,有些天然矿物可作为金属负载载体参与氧化反应,而存在表面羟基等活性位点的天然矿物可催化臭氧氧化和芬顿氧化反应,天然矿物催化剂能明显提高Fenton、臭氧、过硫酸盐氧化难降解有机物(ROCs)的能力,在污水处理方面具有应用前景。以期能够为今后天然矿物催化剂的开发和在水处理高级氧化技术中的应用提供有益参考。

Catalytic oxidation is one of the most effective water treatment technology to remove refractory organic pollutants,which has strong oxidation capacity and high mineralization efficiency,and the application and research of catalysts are the hotspots.Natural mineral catalysts have incomparable advantages over other catalysts owing to their abundant reserves and low price.In this paper,the mechanism and research progress of natural mineral catalysts in the treatment of refractory organic pollutants in wastewater by Fenton,catalytic ozonation and activated persulfate catalytic oxidation are reviewed.The corresponding reaction conditions,treatment results and catalytic active sites were analyzed.Natural minerals rich in metal elements and thus can be used as catalysts for Fenton oxidation and persulfate oxidation,some natural minerals can be used as metal carriers to participate in oxidation reactions,and natural minerals with active sites such as surface hydroxyl groups can be catalysts for Fenton oxidation and ozone oxidation.Furthermore,natural mineral catalysts can significantly increase the oxidation capacity of ROCs by Fenton,ozone and persulfate,having a promising application prospect in wastewater treatment.This review hopes to provide useful reference for the development of natural mineral catalysts and the future application in advanced oxidation technology for water treatment.