Citation: Jiejing Kong, Xiaodong Lai, Zebao Rui, Hongbing Ji, Shengfu Ji. Multichannel charge separation promoted ZnO/P25 heterojunctions for the photocatalytic oxidation of toluene[J]. Chinese Journal of Catalysis, ;2016, 37(6): 869-877. doi: 10.1016/S1872-2067(15)61093-2 shu

Multichannel charge separation promoted ZnO/P25 heterojunctions for the photocatalytic oxidation of toluene

Jiejing Kong ^a,c, ,
Xiaodong Lai ^a ,
Zebao Rui ^b,c ,
Hongbing Ji ^a,c ,
Shengfu Ji ^d

a School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, Guangdong, China;
b School of Chemical Engineering and Technology, Sun Yat-sen University, Guangzhou 510275, Guangdong, China;
c R&D Center of Waste-Gas Cleaning and Control, Huizhou Research Institute of Sun Yat-sen University, Huizhou 516081, Guangdong, China;
d State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China

Received Date: 22 January 2016
Revised Date: 29 March 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (21576298, 21425627), the Science and Technology Plan Project of Guangdong Province (2013B090500029), and Natural Science Foundation of Guangdong Province (2014A030313135, 2014A030308012), and the State Key Laboratory of Chemical Resource Engineering (CRE-2015-C-301), China.

The fabrication of multicomponent heterojunctions is an effective strategy to improve the performance of TiO₂ based photocatalysts. We provide a new strategy for improving the charge separation and photocatalytic performance of ZnO/TiO₂ composites by the formation of multichannel charge separated heterojunctions. ZnO/P25 composites were prepared by an incipient wetness impregnation method, and applied for the photocatalytic destruction of gaseous toluene. The ZnO/P25 composites consist of anatase TiO₂ (ATiO₂), rutile TiO₂(RTiO₂) and hexagonal zincite structures. The parasitic phase of ZnO in P25 leads to the formation of ZnO(002)/ATiO₂(101)/RTiO₂(110) heterojunctions that exhibit enhanced light absorption and improved multichannel electron/hole separation. ZnO/P25 heterojunctions can completely oxidize toluene into CO₂ and H₂O under ultraviolet light irradiation at room temperature, and show enhanced photocatalytic activity in comparison with P25 owing to the efficient electron-hole separation. Such a multichannel charge separated design strategy may provide new insight into the design of highly effective photocatalysts and their potential technological applications.
- Titanium dioxide,
- Zinc oxide,
- Toluene,
- Photocatalysis,
- Heterojunction,
- Multichannel charge separation
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