非金属掺杂石墨氮化碳复合材料光催化协同活化过一硫酸盐降解有机污染物的研究进展

Research progress of nonmetallic doped graphite carbon nitride composites in photocatalytic activation of peroxymonosulfate system for organic pollutants removal

石墨氮化碳(g-C_(3)N_(4))是一种二维的非金属半导体聚合物,因具有较宽的带隙宽度、丰富的活性位点和原材料合成成本低廉等优点,在协同光催化和活化过一硫酸盐(PMS)降解有机污染物方面具有广阔的应用前景.非金属元素掺杂g-C_(3)N_(4)不仅能克服纯氮化碳可见光利用效率低、比表面积小以及光生的电子-空穴对快速复合等缺点,还能大幅扩展其光响应范围,促进激活PMS的电子迁移,提高催化活性.本文综述了非金属掺杂g-C_(3)N_(4)的制备方法及其耦合光催化和PMS催化降解有机污染物的最新研究进展.此外,针对非金属掺杂g-C_(3)N_(4)光催化协同PMS去除污染物的过程机理进行了简要讨论.最后,提出非金属掺杂g-C_(3)N_(4)复合材料在高级氧化技术中所面临的挑战和机遇,旨在为非金属掺杂g-C_(3)N_(4)耦合光催化-PMS氧化体系在可持续碳催化中的应用提供参考依据.

Graphite carbon nitride(g-C_(3)N_(4)),as a two-dimensional nonmetallic semiconductor polymer,has been widely used for organic pollutants removal by synergistic photocatalysisperoxymonosulfate(PMS)oxidation coupling system due to its wide band gap,abundant active sites and low cost.Doping non-metallic elements into g-C_(3)N_(4)can not only overcome the shortcomings of low visible light utilization efficiency,small specific surface area and rapid recombination of photogenerated electron-hole pairs of pure g-C_(3)N_(4),and it can also expand visible light response,promote electron migration for PMS activation and improve catalytic activity.In this paper,a comprehensive overview on the preparation methods of non-metallic doped g-C_(3)N_(4)and their application in the removal of organic pollutants by the synergistic effect of photocatalysis and Fenton-like catalytic/PMS activation reactions.In addition,the photocatalysis-PMS mechanisms of non-metal doped g-C_(3)N_(4)for pollutant removal are also discussed.Finally,the challenges and opportunities of non-metallic doped g-C_(3)N_(4)composites in advanced oxidation technology are presented,and this review helps to provide insights into the synergistic effect between non-metallic doped g-C_(3)N_(4)and photocatalysis-PMS oxidation coupling system in sustainable carbocatalysis.