原位聚合碳掺杂改性石墨态氮化碳光催化活性研究

本文通过在双氰胺前驱体中添加聚乙二醇,在缩聚过程实现碳掺杂形成含氮空位的g-C₃N₄光催化剂。通过X射线衍射(XRD)、红外光谱(FTIR)、光电子能谱(XPS)、紫外-可见吸收光谱(UV-Vis)和荧光谱(FL)等表征手段,考察了原位聚合碳掺杂形成氮空位对g-C₃N₄物相结构、组分与化学态、光吸收性能及光催化活性的影响。研究结果表明,采用该方法可实现原位聚合碳掺杂,有效拓展g-C₃N₄的可见光吸收至850 nm,在紫外-可见光与可见光照射下光降解RhB及光催化产氢性能均显著提高,尤其可见光条件下的性能提升更为显著。

Increasing Photocatalytic Activity of Graphitic Carbon Nitride by Carbon Doping through in situ Polycondensation

In this paper, g-C₃N₄ with nitrogen vacancy was obtained by carbon doping during in situ polycondensation process from the mixture of dicyandiamide precursor and polyethylene glycol additive. XRD, FTIR, XPS, UV-Vis and FL spectroscopies were employed to investigate the influence of the nitrogen vacancy on the phase structure, composition and chemical states, the light absorption and photocatalytic activity of the as-prepared g-C₃N₄. The results show that in situ carbon doping in the framework of g-C₃N₄ can effectively extend its visible light absorption range to 850 nm. As a consequence, the nitrogen-deficient g-C₃N₄shows much superior photocatalytic activities compared to the pristine g-C₃N₄ in degrading the organic pollutant Rhodamine B and generating hydrogen from aqueous solution containing triethanolamine scavenger under both UV-visible light and visible light irradiation, especially more prominent under visible light irradiation.