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Open AccessArticle

Synthesis of Mesoporous TiO2/Boron-Doped Diamond Photocatalyst and Its Photocatalytic Activity under Deep UV Light (λ = 222 nm) Irradiation

1
Photocatalysis International Research Center, Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
2
ORC Manufacturing Co., Ltd., 4896 Tamagawa, Chino, Nagano 391-0011, Japan
3
Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Present address: Faculty and Graduate School of Urban Environmental Sciences, Department of Applied Chemistry for Environment, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan.
§
Present address: Department of Chemistry, University of North Bengal, Raja Rammohunpur, Darjeeling, West Bengal-734013, India.
Molecules 2018, 23(12), 3095; https://doi.org/10.3390/molecules23123095
Received: 16 October 2018 / Revised: 6 November 2018 / Accepted: 19 November 2018 / Published: 27 November 2018
(This article belongs to the Special Issue Microporous/Mesoporous Inorganic Materials)
There is a need for highly efficient photocatalysts, particularly for water purification. In this study, we fabricated a mesoporous TiO2 thin film on a boron-doped diamond (BDD) layer by a surfactant-assisted sol-gel method, in which self-assembled amphiphilic surfactant micelles were used as an organic template. Scanning electron microscopy revealed uniform mesopores, approximately 20 nm in diameter, that were hexagonally packed in the TiO2 thin film. Wide-angle X-ray diffraction and Raman spectroscopy clarified that the framework crystallized in the anatase phase. Current–voltage (I–V) measurements showed rectification features at the TiO2/BDD heterojunction, confirming that a p–n hetero-interface formed. The as-synthesized mesoporous TiO2/BDD worked well as a photocatalyst, even with a small volume of TiO2 (15 mm × 15 mm × c.a. 1.5 µm in thickness). The use of deep UV light (λ = 222 nm) as a light source was necessary to enhance photocatalytic activity, due to photo-excitation occurring in both BDD and TiO2. View Full-Text
Keywords: surfactant-assisted sol-gel method; mesoporous metal oxide; thin film; photocatalyst; p-n heterojunction; water purification; deep UV light surfactant-assisted sol-gel method; mesoporous metal oxide; thin film; photocatalyst; p-n heterojunction; water purification; deep UV light
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MDPI and ACS Style

Suzuki, N.; Okazaki, A.; Kuriyama, H.; Serizawa, I.; Hara, A.; Hirano, Y.; Nakabayashi, Y.; Roy, N.; Terashima, C.; Nakata, K.; Katsumata, K.-I.; Kondo, T.; Yuasa, M.; Fujishima, A. Synthesis of Mesoporous TiO2/Boron-Doped Diamond Photocatalyst and Its Photocatalytic Activity under Deep UV Light (λ = 222 nm) Irradiation. Molecules 2018, 23, 3095.

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