Enhanced visible-light photocatalytic activity of Z-scheme graphitic carbon nitride/oxygen vacancy-rich zinc oxide hybrid photocatalysts

doi:10.1016/S1872-2067(15)60985-8

Abstract

Abstract:

With the objectives of enhancing the stability, optical properties and visible-light photocatalytic activity of photocatalysts, we modified oxygen vacancy-rich zinc oxide (V_o-ZnO) with graphitic carbon nitride (g-C₃N₄). The resulting g-C₃N₄/V_o-ZnO hybrid photocatalysts showed higher visible-light photocatalytic activity than pure V_o-ZnO and g-C₃N₄. The hybrid photocatalyst with a g-C₃N₄ content of 1 wt% exhibited the highest photocatalytic degradation activity under visible-light irradiation (λ ≥ 400 nm). In addition, the g-C₃N₄/V_o-ZnO photocatalyst was not deactivated after five cycles of methyl orange degradation, indicating that it is stable under light irradiation. Finally, a Z-scheme mechanism for the enhanced photocatalytic activity and stability of the g-C₃N₄/V_o-ZnO hybrid photocatalyst was proposed. The fast charge separation and transport within the g-C₃N₄/V_o-ZnO hybrid photocatalyst were attributed as the origins of its enhanced photocatalytic performance.

Key words: Oxygen deficient zinc oxide, Graphitic carbon nitride, Hybrid photocatalysts, Photodegradation, Z-scheme

Yanan Liu, Ruixia Wang, Zhengkun Yang, Hong Du, Yifan Jiang, Congcong Shen, Kuang Liang, Anwu Xu. Enhanced visible-light photocatalytic activity of Z-scheme graphitic carbon nitride/oxygen vacancy-rich zinc oxide hybrid photocatalysts[J]. Chinese Journal of Catalysis, 2015, 36(12): 2135-2144.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(15)60985-8

https://www.cjcatal.com/EN/Y2015/V36/I12/2135

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