零价铁技术在废水处理领域的应用研究进展

Advances in the Application of Zero-Valent Iron Technology in the Field of Wastewater Treatment

零价铁(ZVI)技术由于其高效性和经济性已经被应用于水处理中。针对ZVI的研究分为两个方面:一方面是研究ZVI改性,包括粒径、内部结构改变,ZVI与其他金属联用;另一方面则是探究ZVI去除水中不同污染物的机理,包括ZVI本身的还原性、FeOOH的吸附共沉淀性、ZVI促Fenton反应等。本文首先介绍了近年来海绵铁、nZVI、ZVI双金属法(微电解法)、ZVI-Fenton法、强氧化剂促ZVI法等水处理方法的研究进展;接着讨论了上述方法去除重金属、砷、硝酸盐、染料及苯酚的反应机理,指出ZVI对于上述几种污染物有着可观的去除效率;最后对未来ZVI处理废水领域的研究提出了建议。

Zero-valent iron( ZVI) technology has been widely used in wastewater treatment due to its high efficiency and economy. The recent research onZVI was divided into two major directions: one is to explore the modification of ZVI,including its particle size,internal structure change,and the combination of ZVI and other metals;the other is to study the mechanism of ZVI removing different contaminants,including the reducibility of ZVI,adsorption precipitation of the Fe OOH,ZVI promoted Fenton reaction,etc. This paper firstly summarized the recent advances of ZVI-based water treatment methods including sponge iron,nZVI,doping of ZVI with other metals( micro-electrolysis method),combination of ZVI with Fenton-based oxidation. Then,the reaction mechanism of the above methods for removing heavy metals,arsenic,nitrates,dyes and phenol was discussed,and it was pointed out that ZVI materials have appreciable removal efficiency for several types of pollutants. Finally,the future perspectives regarding the application of ZVI in treating wastewater was proposed.