物理化学学报2021，Vol.37Issue(8)：52-64,13.DOI:10.3866/PKU.WHXB202011073
缺陷工程调控石墨相氮化碳及其光催化空气净化应用进展
Defect Engineering in Two-Dimensional Graphitic Carbon Nitride and Application to Photocatalytic Air Purification
摘要
Abstract
Since the pioneering work on polychlorinated biphenyl photodegradation by Carey in 1976,photocatalytic technology has emerged as a promising and sustainable strategy to overcome the significant challenges posed by energy crisis and environmental pollution.In photocatalysis,sunlight,which is an inexhaustible source of energy,is utilized to generate strongly active species on the surface of the photocatalyst for triggering photo-redox reactions toward the successful removal of environmental pollutants,or for water splitting.The photocatalytic performance is related to the photoabsorption,photoinduced carrier separation,and redox ability of the semiconductor employed as the photocatalyst.Apart from traditional and noble metal oxide semiconductors such as P25,bismuth-based compounds,and Pt-based compounds,2D g-C3N4 is now identified to have enormous potential in photocatalysis owing to the special π-π conjugated bond in its structure.However,some inherent drawbacks of the conventional g-C3N4,including the insufficient visible-light absorption ability,fast recombination of photogenerated electron-hole pairs,and low quantum efficiency,decrease its photocatalytic activity and limit its application.To date,various strategies such as heterojunction fabrication,special morphology design,and element doping have been adopted to tune the physicochemical properties of g-C3N4.Recent studies have highlighted the potential of defect engineering for boosting the light harvesting,charge separation,and adsorption efficiency of g-C3N4 by tailoring the local surface microstructure,electronic structure,and carrier concentration.In this review,we summarize cutting-edge achievements related to g-C3N4 modified with classified non-external-caused defects (carbon vacancies,nitrogen vacancies,etc.) and external-caused defects (doping and functionalization) for optimizing the photocatalytic performance in water splitting,removal of contaminants in the gas phase and wastewater,nitrogen fixation,etc.The distinctive roles of various defects in the g-C3N4 skeleton in the photocatalytic process are also summarized.Moreover,the practical application of 2D g-C3N4 in air pollution control is highlighted.Finally,the ongoing challenges and perspectives of defective g-C3N4 are presented.The overarching aim of this article is to provide a useful scaffold for future research and application studies on defect-modulated g-C3N4.关键词
石墨相氮化碳(g-C3N4)/缺陷工程/光催化/实际应用Key words
Graphitic carbon nitride/Defect engineering/Photocatalysis/Practical application分类
化学化工引用本文复制引用
王薇,黄宇,王震宇..缺陷工程调控石墨相氮化碳及其光催化空气净化应用进展[J].物理化学学报,2021,37(8):52-64,13.基金项目
The project was supported by the National Key Research and Development Program of China (2016YFA0203000),National Nature Science Foundation of China (51878644,41573138),Strategic Priority Research Program of the Chinese Academy of Sciences,China (XDA23010300,XDA23010000).国家重点研发计划"纳米科技重点专项"(2016YFA0203000),国家自然科学基金(51878644,41573138),中国科学院先导专项(XDA23010300,XDA23010000)资助项目 （2016YFA0203000）
