Preparation of reduced graphene oxide/nano TiO<sub>2</sub> composites by two-step hydrothermal method and their photocatalytic properties

YAN Wenyuan; ZHOU Qi; CHEN Xing; YANG Yong; WU Yucheng

doi:10.13801/j.cnki.fhclxb.20150407.001

Volume 33 Issue 1

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YAN Wenyuan, ZHOU Qi, CHEN Xing, et al. Preparation of reduced graphene oxide/nano TiO2 composites by two-step hydrothermal method and their photocatalytic properties[J]. Acta Materiae Compositae Sinica, 2016, 33(1): 123-131. doi: 10.13801/j.cnki.fhclxb.20150407.001

Citation:

YAN Wenyuan, ZHOU Qi, CHEN Xing, et al. Preparation of reduced graphene oxide/nano TiO₂ composites by two-step hydrothermal method and their photocatalytic properties[J]. Acta Materiae Compositae Sinica, 2016, 33(1): 123-131. doi: 10.13801/j.cnki.fhclxb.20150407.001

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Preparation of reduced graphene oxide/nano TiO₂ composites by two-step hydrothermal method and their photocatalytic properties

doi: 10.13801/j.cnki.fhclxb.20150407.001

YAN Wenyuan^1,2,
ZHOU Qi^1,2,
CHEN Xing^{1,3
,},
YANG Yong⁴,
WU Yucheng^1,2

1.
School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China;
2.
Anhui Province Key Laboratory of Advanced Functional Materials and Devices, Hefei University of Technology, Hefei 230009, China;
3.
Laboratory of Nanomaterials and Environmental Detection, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, China;
4.
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

Received Date: 2015-01-21
Rev Recd Date: 2015-02-25
Publish Date: 2016-01-15

Abstract

Abstract

In order to investigate the preparation method and photocatalytic properties of composites comprised by reduced graphene oxide (RGO) and TiO₂ with high activity facets, RGO/nano TiO₂ composites were prepared by two-step hydrothermal method: the 1st step was the synthesis of nano TiO₂ exposed with high activity facets; the 2nd step was the recombination of as-synthesized nano TiO₂ and graphene oxide (GO), thus RGO/nano TiO₂composites were formed. Then, the prepared nano TiO₂ with different exposed facets and RGO/nano TiO₂ composites were characterized by means of XRD, SEM, X-ray photoelectron spectrometer, ultraviolet-visible diffuse reflectance spectroscopy and so on, and the photocatalytic properties were evaluated. The results show that during the 1st step of hydrothermal method, nano TiO₂ which has high activity (001) and (101) facets can be controllably prepared by adjusting the concentration of HF. Fluorine atoms exist in nano TiO₂ by two states of physically adsorbing state and chemically binding state. After the 2nd step, GO recombines with nano TiO₂ to form RGO/nano TiO₂ composite, and GO is transformed to RGO simultaneously in the process. RGO/nano TiO₂ composites synthesized by two-step hydrothermal method have favorable photocatalytic performances under ultraviolet illumination, which outperform those of commercial TiO₂ (P25) and nano TiO₂. The photocatalytic properties of RGO/nano TiO₂ composites have remarkable improvement. RGO and exposed facets of TiO₂ have effects on the photocatalytic activity.
- TiO₂,
- two-step hydrothermal method,
- graphene,
- nano TiO₂ composites,
- photocatalysis
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