Controllable Approach to Carbon‐Deficient and Oxygen‐Doped Graphitic Carbon Nitride: Robust Photocatalyst Against Recalcitrant Organic Pollutants and the Mechanism Insight. (12th March 2021)

• Record Type: Journal Article
• Authors: Wang, Xinyue; Meng, Jiaqi; Zhang, Xueyan; Liu, Yunqing; Ren, Miao; Yang, Yuxin; Guo, Yihang
• Is Part Of: Advanced functional materials. Volume 31:Number 20(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-03-12
• Subjects: carbon defect -- oxygen doping -- graphitic carbon nitride -- photocatalysis -- organic pollutants; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202010763
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Polymeric g‐C3 N4 is a promising visible‐light‐responsive photocatalyst; however, the fast recombination of charge carriers and moderate oxidation ability remarkably restrict its photocatalytic oxidation efficiency towards organic pollutants. To overcome these drawbacks, a self‐modification strategy of one‐step formaldehyde‐assisted thermal polycondensation of molten urea to prepare carbon‐deficient and oxygen‐doped g‐C3 N4 (VC ‐OCN) is developed, and the carbon vacancy concentration is well‐controlled by changing formaldehyde dosage. The VC ‐OCN catalysts exhibit interesting carbon vacancy concentration‐dependent photocatalytic removal efficiency to p ‐nitrophenol (PNP) and atrazine (ATN), in which VC ‐OCN15 with appropriate carbon vacancy concentration displays significantly higher pollutant removal efficiency than bulk g‐C3 N4 . The apparent first‐order rate constant of VC ‐OCN15 for PNP and ATN removal is 4.4 and 5.2 times higher than that of bulk g‐C3 N4 . A combination of the experimental results and theoretic calculations confirm that the synergetic effect of carbon vacancies and oxygen doping sites can not only delay the recombination of charge carriers but also facilitate adsorption of oxygen molecules on the carbon vacancies, which leads to the generation of plentiful active oxygen species including not only superoxide anion radicals but also indirectly formed hydroxyl radicals and singlet oxygen. These active oxygen species play a dominant role in the removal of target pollutants. Abstract : A strategy of one‐step formaldehyde‐assisted thermal polycondensation of molten urea to prepare carbon‐deficient and oxygen‐doped g‐C3 N4 (VC ‐OCN) is developed, in which carbon vacancy concentration is controllable. At a suitable carbon vacancy concentration, the VC ‐OCN exhibits a significantly higher photocatalytic oxidation capacity to organic pollutants than bulk g‐C3 N4, attributed to the synergetic effect of carbon vacancies and oxygen doping sites.