Research progress on the construction,deactivation and stability of oxygen deficient photocatalysts
The construction of oxygen defects can reduce the band gap(Eg)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 abili-ty of the material to adsorb and activate O2,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 deacti-vating materials with the aim of providing references for the design and modification of highly active and stable oxygen-deficient photocatalytic materials.
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