污泥生物炭基催化剂在高级氧化水处理的应用

Application of sludge biochar-based catalysts in advanced oxidation processes for water treatment

污泥作为污水处理过程的残留物,含有多种重金属、有机物以及微生物等污染物,严重危害环境和人体健康。污泥衍生的生物炭基材料具有优良的孔隙结构、表面电荷分布以及含氧基团,在高级氧化水处理领域显示出极大潜力。目前,多种污泥生物炭基催化剂成功应用于光催化、过硫酸盐活化以及芬顿等氧化体系,显示出较高催化活性。系统地总结了污泥生物炭基材料的制备方法;全面阐述其在不同氧化体系的应用及作用机理。指出未来污泥生物炭基催化剂的稳定性需进一步增强,以防所含重金属等污染组分释放;同时,污泥生物炭在动态连续流反应器中的催化活性和循环再生能力需进一步考察,以增强实际工业化应用潜力。

Sludge,as the residue after sewage treatment,contains various heavy metals,organic matter and microorganisms,which is seriously harmful to the environment and human health.Sludge-derived biocharbased materials exhibit promising application prospect in the field of advanced oxidation processes for water treatment due to their favorable porous structure,excellent surface charge distribution and abundant oxygen-containing functional groups.At present,multiple sludge biochar-based catalysts with high catalytic activity have employed successfully in the photocatalysis,persulfate activation and Fenton oxidation systems.Herein,the preparation methods of sludge biochar-based materials are summarized systematically.In addition,the application and mechanisms of sludge biochar-based catalysts in different oxidation systems are analyzed comprehensively.It is pointed out that the stability of sludge biochar-based catalysts should be further enhanced to prevent the release of heavy metals and other contaminants in the future.Meanwhile,the catalytic activity and recyclability of sludge biochar-based catalysts in the continuous-flow reactor should be further investigated to enhance the potential of practical industrial application.