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Vol. 4 No. 2 (2012)

Preparation and Characterization of Freestanding Hierarchical Porous TiO2 Monolith Modified with Graphene Oxide

https://doi.org/10.1007/BF03353698
Lei Wan
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Dongchuan Road 800, Shanghai 200240, People’s Republic of China
Mingce Long
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Dongchuan Road 800, Shanghai 200240, People’s Republic of China
Dongying Zhou
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Dongchuan Road 800, Shanghai 200240, People’s Republic of China
Liying Zhang
Key Laboratory for Thin Film and Microfabrication of the Ministry of Education, Research Institute of Micro/Nano Science and Technology, Shanghai Jiao Tong University, Shanghai, 200240, China
Weimin Cai
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Dongchuan Road 800, Shanghai 200240, People’s Republic of China

Corresponding Author: Mingce Long

long_mc@sjtu.edu.cn

Nano-Micro Letters, Vol. 4 No. 2 (2012), Article Number: 90-97

Abstract

Catalyst recovery is one of the most important aspects that restrict the application of TiO2 photocatalyst. In order to reduce restrictions and improve the photocatalytic efficiency, a hierarchical porous TiO2 monolith (PTM) with well-defined macroporous and homogeneous mesoporous structure was prepared by using a sol-gel phase separation method. P123 was used as the mesoporous template and graphene oxide was applied to increase the activity and integrity of the monolithic TiO2. According to scanning electron microscopy and the Barrett-Joyner-Halenda measurements, PTM3 is mainly composed of 10 nm anatase crystallines with 3.6 nm mesopores and 2–8 μm macropores. Further characterization suggests carbon and nitrogen have been maintained in the PTM during calcinations so as to induce the visible light activity. The PTM with 0.07 wt% graphene oxide dosage shows high efficiency for methyl orange (MO) decolorization under both full spectrum and visible light irradiation (λ>400 nm). Besides, the monolith remains intact and has good photocatalytic stability after four cyclic experiments.

Keywords

Photocatalysis Titanium dioxide Porous monolith Graphene oxide
Wan, Lei, Mingce Long, Dongying Zhou, Liying Zhang, and Weimin Cai. 2012. “Preparation and Characterization of Freestanding Hierarchical Porous TiO2 Monolith Modified With Graphene Oxide”. Nano-Micro Letters 4 (2):90-97. https://doi.org/10.1007/BF03353698.
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