原位聚合碳掺杂改性石墨态氮化碳光催化活性研究  

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

作　　者：洪星星[1] 康向东[1] 刘岗[1] 成会明[1] 

机构地区：[1]中国科学院金属研究所沈阳材料科学国家(联合)实验室,辽宁沈阳110016

出　　处：《影像科学与光化学》2015年第5期434-440,共7页Imaging Science and Photochemistry

基　　金：国家重点基础研究发展规划973项目(2014CB239401);国家自然科学基金项目(51422210)资助

摘　　要：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gC3N4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850nm,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。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-C3N4 shows 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.

关 键 词：光催化 g-C3N4 掺杂 空位 聚乙二醇 

分 类 号：O643.36[理学—物理化学]