ABSTRACT

Of current interest is visible-light activated g-C₃N₄, owing to its unique physicochemical properties for the photocatalytic H₂ production and pollutant remediation. In this research, the synthetic procedures, physicochemical properties, and major approaches to overcome the intrinsic drawbacks of g-C₃N₄ are reviewed. Of different synthesis procedures for GCN, thermal polymerization is recommended with advantages such as simplicity, economic, and high yield. Element doping, as a facile method, can modify g-C₃N₄ structure and improve its performance in the photocatalytic evolution of H₂ which is significantly increased from 208 µmol h⁻¹ g⁻¹ for bare g-C₃N₄ to 5128 µmol h⁻¹ g⁻¹ for P-doped g-C₃N₄. Ammonium salts can be effectively used for the synthesis of g-C₃N₄ nanosheets and element doping simultaneously. Vacancy defect plays an important role in the improvement of the photocatalytic activity. Compared to custom photocatalysis and electrocatalysis, photoelectrocatalysis is highly promising for pollutant decontamination due to the effective separation of charge carriers.

摘要

目前人们感兴趣的是可见光激活的gC ₃ N ₄，因为它具有用于光催化H ₂生产和污染物修复的独特物理化学性质。本研究综述了gC 3 N 4 的合成过程、理化性质以及克服gC ₃ N _{4固有缺陷的主要方法。}在GCN的不同合成方法中，推荐热聚合，具有简单、经济、产率高的优点。元素掺杂作为一种简便的方法，可以改变gC ₃ N ₄结构，提高其光催化析出H _{2的性能。}其从裸gC ₃ N ₄的208μmol h ^-1 g ^-1显着增加到P掺杂gC ₃ N ₄的5128μmol h ^-1 g ^-1。铵盐可以有效地同时用于gC ₃ N ₄纳米片的合成和元素掺杂。空位缺陷对于光催化活性的提高起着重要作用。与定制的光催化和电催化相比，光电催化由于电荷载体的有效分离而在污染物净化方面非常有前景。