类水滑石基催化剂光催化二氧化碳还原研究进展

Research advance of hydrotalcite-based catalysts in photocatalytic reduction of carbon dioxide

类水滑石材料是一类特殊的二维层状阴离子黏土,其具有结构组成可调、记忆效应、结构有序等诸多优良特性,被认为是安全绿色的新型光催化剂。本文总结了类水滑石材料结构和特性,并阐明其主要特性在光催化过程中的应用;对各种类水滑石材料的光催化CO_(2)还原性能进行了对比;综述了光催化CO_(2)还原的机理及其发展所面临的挑战;根据光催化CO_(2)还原的基本过程,从光吸收、载流子分离和界面反应等角度对类水滑石基光催化剂的发展现状进行分类介绍。尽管类水滑石基光催化剂的研究已取得一定进展,但仍需进一步探究其光催化机理、各组分间的协同作用机理以及界面反应机理,以期实现类水滑石基光催化剂结构的合理设计和活性位点的精准调控。

The hydrotalcite-like compounds are a special type of two-dimensional anionic clay,which are characterized by tunable composition,memory effect and structural ordering,and thus they are considered to be safe and environment-friendly photocatalysts.We summarize the structural characteristics,properties,and photocatalytic application of hydrotalcite-like compounds in this review,and their catalytic performance in the photocatalytic reduction of carbon dioxide was compared.Secondly,we review the mechanism of photocatalytic reduction of CO_(2) and the challenge in its development.In the end,we introduce the current development of hydrotalcite-based photocatalysts from three aspects,i.e.light absorption,separation of charge carriers and surface reaction,according to the basic mechanism of the CO_(2) reduction.Although some progress has been achieved in the study of hydrotalcite-based photocatalysts,it is necessary to further explore their photocatalytic mechanism,synergistic mechanism of various components and interfacial reaction mechanism in order to achieve their rational structural design and precise regulation of the active sites.