氧缺陷型光催化剂构建、失活及其稳定性研究进展

Research progress on the construction,deactivation and stability of oxygen deficient photocatalysts

氧缺陷构筑可以缩小光催化材料的带隙(E_(g))以提高材料光响应能力,引入的缺陷能级促进了光生载流子的分离与传输。此外,氧缺陷的构筑提高了材料吸附、活化O_(2)分子的能力,促进活性氧物种(ROS)的产生以提高有机污染物的降解效率。然而,氧缺陷结构易被活性物种氧化或有机分子占据,表现为光催化材料活性的衰退。列举了氧缺陷型光催化材料的构筑方法和失活原因,总结了通过表面包覆、有机物桥连、异质结构筑和金属粒子沉积等手段提高氧缺陷结构稳定性的方法及其机理,梳理了失活材料的常用再生方法及原理,旨在为高活性、高稳定性氧缺陷型光催化材料的设计与改性提供参考。

The construction of oxygen defects can reduce the band gap(E_(g))of photocatalytic materials to improve their photoresponse ability,and the introduced defect energy levels promote the separation and transport of photogenerated charge carriers.In addition,the formation of oxygen defects improves the ability of the material to adsorb and activate O_(2),thereby promoting the formation of reactive oxygen species(ROS)to improve the degradation efficiency of organic pollutants.However,oxygen deficient structures are easily oxidized by active species or occupied by organic molecules,leading to a decrease in the activity of photocatalytic materials.This article lists the construction methods and deactivation reasons of oxygen deficient photocatalytic materials,summarizes the methods and mechanisms for improving the stability of oxygen-depleted structures through surface coating,organic bridging,heterostructure construction,and metal particle deposition,and outlines the commonly used regeneration methods and principles for deactivating materials with the aim of providing references for the design and modification of highly active and stable oxygen-deficient photocatalytic materials.