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OH/Na co-functionalized carbon nitride: directional charge transfer and enhanced photocatalytic oxidation ability
Catalysis Science & Technology ( IF 5 ) Pub Date : 2019/11/28 , DOI: 10.1039/c9cy02048a
Jiadong Wang 1, 2, 3, 4, 5 , Wen Cui 5, 6, 7, 8, 9 , Ruimin Chen 1, 2, 3, 4, 5 , Ye He 5, 6, 7, 8, 9 , Chaowei Yuan 1, 2, 3, 4, 5 , Jianping Sheng 5, 6, 7, 8, 9 , Jieyuan Li 5, 6, 7, 8, 9 , Yuxin Zhang 5, 10, 11, 12 , Fan Dong 1, 2, 3, 4, 5 , Yanjuan Sun 1, 2, 3, 4, 5
Affiliation  

Graphitic carbon nitride (g-C3N4, CN for short) is a compelling visible-light responsive photocatalyst. However, its photocatalytic efficiency is low due to the random carrier transfer in planes and insufficient redox potential. Herein, we build oxygen functional group modified sodium-doped carbon nitride (OH/Na co-functionalized carbon nitride) to promote directional transfer of charge carriers for acceleration of separation and enhance redox potential for efficient oxidation of NO in air. Specifically, the function of sodium atoms could control the directional transfer of random carriers from the intralayer to the oxygen functional group-modified surface for the purpose of effectively reducing photogenerated electron–hole recombination. Meanwhile, the modification by oxygen-containing functional groups could adjust the band structure of CN, thereby increasing the oxidation–reduction potential of NO in the photocatalyst. The transformation pathways and reaction mechanism of photocatalytic NO oxidation on CN and OH/Na co-functionalized carbon nitride have also been explicated by ESR spectroscopy and in situ DRIFTS and compared. This work provides a new method for simultaneously controlling the random transfer of carriers and adjusting the energy band structure of CN to optimize its photocatalytic efficiency. It is also possible to extend this strategy to improve the performance of other 2D layered catalysts for photocatalytic oxidation.

中文翻译:

OH / Na共官能化氮化碳:定向电荷转移和增强的光催化氧化能力

石墨氮化碳(gC 3 N 4,CN)是一种引人注目的可见光响应型光催化剂。然而,由于平面中的随机载流子转移和不足的氧化还原电势,其光催化效率低。本文中,我们构建了氧官能团改性的钠掺杂碳氮化物(OH / Na共官能化碳氮化物),以促进电荷载流子的定向转移,从而加快分离速度,并增强氧化还原电势,以有效地氧化空气中的NO。具体来说,钠原子的功能可以控制随机载流子从层内到氧官能团修饰表面的方向转移,以有效减少光生电子-空穴的复合。同时,通过含氧官能团的修饰可以调节CN的能带结构,从而增加了光催化剂中NO的氧化还原电位。ESR光谱学还阐明了CN和OH / Na共官能化碳氮化合物在CN和OH / Na共官能化碳氮化合物上的光催化NO氧化的转化途径和反应机理。与原位DRIFTS进行比较。这项工作为同时控制载流子的随机转移和调节CN的能带结构以优化其光催化效率提供了一种新方法。也有可能扩展该策略以改善其他2D层状催化剂的光催化氧化性能。
更新日期:2020-02-10
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