Porous structure dependent photoreactivity of graphitic carbon nitride under visible light
Porous structure dependent photoreactivity of graphitic carbon nitride under visible light
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可见光下石墨碳氮化物的多孔结构依赖性光反应性
DOI：
10.1039/c1jm14312c
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发表时间：
2012-01-01
影响因子：
--
通讯作者：
Zhang, Lizhi
中科院分区：
文献类型：
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作者：
Dong, Guohui;Zhang, Lizhi
我们证明，石墨氮化碳可以在水蒸气存在下将 CO2 光还原为 CO，并在可见光（λ > 420 nm）下表现出有趣的多孔结构依赖的光还原和光氧化反应活性。通过直接加热廉价的三聚氰胺合成石墨氮化碳，用盐酸三聚氰胺替代三聚氰胺可以导致最终石墨氮化碳具有更高的表面积（39倍）和更丰富的孔，同时带隙增加0.13 eV。多孔化可使石墨氮化碳在罗丹明B光氧化中的光反应活性显着增强9.4倍，但在CO2光还原中的活性降低4.6倍。详细研究了多孔结构依赖光反应性的原因。这些新发现可以为高效光催化剂的设计及其光反应性的环境和能源应用的调整提供线索。
We demonstrate that graphitic carbon nitride can photoreduce CO2 to CO in the presence of water vapor and exhibit interesting porous structure dependent reactivity on photoreduction and photooxidation under visible light (lambda > 420 nm). Graphitic carbon nitride was synthesized by directly heating the inexpensive melamine and the replacement of melamine with melamine hydrochloride could result in porousification in the final graphitic carbon nitride with much higher surface area (39 times) and more abundant pores, accompanied by a band gap increase of 0.13 eV. The porousification could significantly enhance the photoreactivity of graphitic carbon nitride in rhodamine B photooxidation by 9.4 times, but lower its activity in CO2 photoreduction by 4.6 times. The reasons for the porous structure dependent photoreactivity were investigated in detail. These new findings could shed light on the design of efficient photocatalysts and the tuning of their photoreactivity for environmental and energy applications.