Graphitic-C₃N₄-hybridized TiO₂ nanosheets with reactive {0 0 1} facets to enhance the UV- and visible-light photocatalytic activity

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• 作者：Liuan Gu^b ; Jingyu Wang^a ; ^b ; ^{jingyu.wang@163.com" class="auth_mail} ; Zhijuan Zou^b ; Xijiang Han^b ; ^{hanxj63@yahoo.com.cn" class="auth_mail}
• 关键词：TiO2 ; Graphitic-C3N4 ; {0  ; 0  ; 1} facets ; Hybrid materials ; Photocatalysis
• 刊名：Journal of Hazardous Materials
• 出版年：15 March, 2014
• 年：2014
• 卷：268
• 期：Complete
• 页码：216-223
• 全文大小：2700 K

文摘

Anatase TiO₂ nanosheets with dominant {0 0 1} facets were hybridized with graphitic carbon nitride (g-C₃N₄) using a facile solvent evaporation method. On top of the superior photocatalytic performance of highly reactive {0 0 1} facets, the hybridization with g-C₃N₄ is confirmed to further improve the reactivity through degrading a series of organic molecules under both UV- and visible-light irradiation. It is proposed that an effective charge separation between g-C₃N₄ and TiO₂ exists in the photocatalytic process, i.e., the transferring of photogenerated holes from the valence band (VB) of TiO₂ to the highest occupied molecular orbital (HOMO) of g-C₃N₄, and the injecting of electrons from the lowest unoccupied molecular orbital (LUMO) of g-C₃N₄ to the conduction band (CB) of TiO₂. Due to this synergistic effect, the enhancement of UV- and visible-light photoactivity over the hybrid is achieved. Furthermore, it has been revealed that holes were the main factor for the improved photoactivity under UV-light, while the OH radicals gained the predominance for degrading organic molecules under visible-light. Overall, this work would be significant for fabricating efficient UV-/visible-photocatalysts and providing deeper insight into the enhanced mechanisms of 蟺-conjugated molecules hybridized semiconductors.