The transformation from graphite to turbostratic graphite by means of the treatment with high energy ball milling was investigated by X ray powder diffraction method. It is believed that the size effect of nano cry...The transformation from graphite to turbostratic graphite by means of the treatment with high energy ball milling was investigated by X ray powder diffraction method. It is believed that the size effect of nano crystal leads to this transformation. A possible transformation mechanism is proposed from the change of the eletronic structure of the hexagonal plane of the carbon atoms.展开更多
The application of solar-driven photocatalytic processes shows considerable potential for renewable energy production and environmental remediation.Graphitic carbon nitride(g-C_(3)N_(4))has emerged as a highly promisi...The application of solar-driven photocatalytic processes shows considerable potential for renewable energy production and environmental remediation.Graphitic carbon nitride(g-C_(3)N_(4))has emerged as a highly promising metal-free photocatalyst due to its outstanding electronic structure and physicochemical properties.However,the intrinsic constraints of pristine g-C_(3)N_(4),such as limited visible light absorption range,high recombination rates of photogenerated charge carriers,and a scarcity of active sites,have significantly hindered its photocatalytic performance and practical implementations.Recent studies have demonstrated that defect engineering can substantially mitigate these issues by enhancing both light absorption and charge separation efficiency,thereby improving photocatalytic performance.This reviewprovides a comprehensive overview of intrinsically defective g-C_(3)N_(4)-based materials,focusing on the types of intrinsic defects,their modification strategies,and the recent advancements in the field.It also highlights the diverse applications of defect-modified g-C_(3)N_(4),including wastewater remediation,hydrogen evolution,CO_(2)conversion,NO removal,nitrogen fixation,photocatalytic disinfection,and H_(2)O_(2)production.Finally,the current challenges and future perspectives are discussed of g-C_(3)N_(4)-based photocatalytic materials,offering insights and practical guidance for the development of advanced g-CsN4-based photocatalysts.展开更多
文摘The transformation from graphite to turbostratic graphite by means of the treatment with high energy ball milling was investigated by X ray powder diffraction method. It is believed that the size effect of nano crystal leads to this transformation. A possible transformation mechanism is proposed from the change of the eletronic structure of the hexagonal plane of the carbon atoms.
基金This work was supported by the Key Research and Development Program of Shaanxi Province(No.2022ZDLSF07-04)Xi’an Science and Technology Projects(Nos.2022JH-RYFW-0114 and 2023JH-GXRC-0196)Graduate Innovation Fund Project of Xi'an Shiyou University(No.YCX2411003).
文摘The application of solar-driven photocatalytic processes shows considerable potential for renewable energy production and environmental remediation.Graphitic carbon nitride(g-C_(3)N_(4))has emerged as a highly promising metal-free photocatalyst due to its outstanding electronic structure and physicochemical properties.However,the intrinsic constraints of pristine g-C_(3)N_(4),such as limited visible light absorption range,high recombination rates of photogenerated charge carriers,and a scarcity of active sites,have significantly hindered its photocatalytic performance and practical implementations.Recent studies have demonstrated that defect engineering can substantially mitigate these issues by enhancing both light absorption and charge separation efficiency,thereby improving photocatalytic performance.This reviewprovides a comprehensive overview of intrinsically defective g-C_(3)N_(4)-based materials,focusing on the types of intrinsic defects,their modification strategies,and the recent advancements in the field.It also highlights the diverse applications of defect-modified g-C_(3)N_(4),including wastewater remediation,hydrogen evolution,CO_(2)conversion,NO removal,nitrogen fixation,photocatalytic disinfection,and H_(2)O_(2)production.Finally,the current challenges and future perspectives are discussed of g-C_(3)N_(4)-based photocatalytic materials,offering insights and practical guidance for the development of advanced g-CsN4-based photocatalysts.
