生物炭及其复合材料活化过硫酸盐研究进展

Research progress in biochar and its composites activated persulfate

以硫酸根自由基(SO_(4)^(-)·)为基础的高级氧化工艺被公认为是降解有机废水的有效方法之一。作为一种经济、易得的含碳材料,生物炭已逐渐应用于高级氧化领域。生物炭及其复合材料活化过硫酸盐已成为一种较有前景的有机污染物降解体系。本文分析了用于过硫酸盐活化的不同典型生物炭基催化剂最新研究进展,包括原始生物炭、过渡金属负载生物炭、非金属掺杂生物炭、金属与非金属共掺杂生物炭等。总结了其合成方法和理化性质,并分别讨论了生物炭基催化剂对过硫酸盐的活化性能与机理,以及该体系对有机污染物的降解机理。最后根据现有研究进展,分别从不同生物质来源、金属非金属共同改性生物炭技术以及降解过程中生态毒性动态变化等角度,针对降解机制探索、潜在催化剂开发和实际催化系统应用等方面,对生物炭及其复合材料进行了相关讨论并提出建议。

Advanced oxidation process based on sulfate radical(SO_(4)^(-)·)is recognized as one of the effective methods to degrade organic wastewater.In recent years,as an economical and readily available carbon containing material,biochar has been gradually applied in the advanced oxidation field.Biochar and its composite activated persulfate have become a promising system for organic pollutants degradation.The latest research progress of different typical biochar-based catalysts for persulfate activation was analyzed,including pristine biochar,transition metal loaded biochar,non-metallic doping biochar,and metallic and non-metallic co-doping biochar.In addition,the synthesis methods and physicochemical properties were summarized.Furthermore,the activation performance and mechanism of biochar-based catalysts for persulfate and the degradation mechanism of organic pollutants were discussed,respectively.Finally,based on the current research progress,from the perspectives of different biomass sources,metallic and non-metallic co-modified biochar technology and the dynamic change of ecotoxicity in the degradation process,relevant discussions and future suggestions for biochar and its composites were put forward in terms of degradation mechanism exploration,potential catalyst development and practical catalytic system application.