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Acta Phys. -Chim. Sin.  2015, Vol. 31 Issue (3): 519-526    DOI: 10.3866/PKU.WHXB201412291
CATALYSIS AND SURFACE SCIENCE     
Preparation and Photocatalytic Activity of Mixed Phase TiO2-Graphene Composites
YU Jian-Hua1, FAN Min-Guang1,2, LI Bin1, DONG Li-Hui1, ZHANG Fei-Yue1
1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, P. R. China;
2. Guangxi Key Laboratory Petrochemical Rescource Processing and Process Intensification Technology, Nanning 530004, P. R. China
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Abstract  

A series of composites consisting of anatase-rutile TiO2 and graphene (TrG) were synthesized by a hydrothermal route. The influence of the amount of graphene oxide on the photocatalytic activity during the degradation of methyl blue was studied. The photocatalysts were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, high-resolution transmission electron microscopy (HRTEM), Raman spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), X-ray photoelectron spectroscopy (XPS), and Brunauer-Emmett-Teller (BET) specific surface area measurements. The results show that as-prepared TiO2 formed in the anatase and rutile phase with a bar structure and it dispersed uniformly over the surface of the graphene sheets. The composites possess higher catalytic activity because of the strong absorption capacity of graphene, the establishment of heterojunctions between rutile and anatase TiO2, the remarkable electrical transport between TiO2 and graphene and the high specific surface areas. The photodegradation performance of methyl blue by the TrG composites under UV light was studied. Our results indicate that the photocatalytic activities of titanium dioxide-graphene composites were higher than those of pure TiO2. We also found that the TrG composites prepared with a loading of 0.8%(mass fraction, w) graphene oxide had the best photocatalytic activity.



Key wordsMixed phase TiO2      Heterojunction      Graphene      Photoelectron transfer      Hydrothermal route      Photocatalysis     
Received: 27 October 2014      Published: 29 December 2014
MSC2000:  O643  
  O645  
Fund:  

The project was supported by the National Key Basic Research Program of China (973) (2012CB21500203) and Dean Project of Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, China (2013K009, 2013Z001).

Corresponding Authors: FAN Min-Guang     E-mail: fanmg@gxu.edu.cn
Cite this article:

YU Jian-Hua, FAN Min-Guang, LI Bin, DONG Li-Hui, ZHANG Fei-Yue. Preparation and Photocatalytic Activity of Mixed Phase TiO2-Graphene Composites. Acta Phys. -Chim. Sin., 2015, 31(3): 519-526.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB201412291     OR     http://www.whxb.pku.edu.cn/Y2015/V31/I3/519

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