Synergetic effect in water treatment with mesoporous TiO2/BDD hybrid electrode

Norihiro Suzuki; Akihiro Okazaki; Haruo Kuriyama; Izumi Serizawa; Yuki Hirami; Aiga Hara; Yuiri Hirano; Yukihiro Nakabayashi; Nitish Roy; Chiaki Terashima; Kazuya Nakata; Ken-ichi Katsumata; Takeshi Kondo; Makoto Yuasa; Akira Fujishima

doi:10.1039/C9RA10318J

Synergetic effect in water treatment with mesoporous TiO₂/BDD hybrid electrode†

Norihiro Suzuki,

‡*^a Akihiro Okazaki,‡^b Haruo Kuriyama,^b Izumi Serizawa,^b Yuki Hirami,^c Aiga Hara,^c Yuiri Hirano,^c Yukihiro Nakabayashi,^ae Nitish Roy,

^af Chiaki Terashima,^a Kazuya Nakata,^acg Ken-ichi Katsumata,^ad Takeshi Kondo,^c Makoto Yuasa^c and Akira Fujishima^a

Author affiliations

* Corresponding authors

^a Photocatalysis International Research Center, Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
E-mail: suzuki.norihiro@rs.tsu.ac.jp

^b ORC Manufacturing Co., Ltd, 4896 Tamagawa, Chino, Nagano 391-0011, Japan

^c Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan

^d Faculty of Industrial Science and Technology, Tokyo University of Science, 6-3-1 Niijyuku, Katsushika, Tokyo 125-8585, Japan

^e 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

^f Department of Chemistry, University of North Bengal, Raja Rammohunpur, Darjeeling, West Bengal-734013, India

^g Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-0012, Japan

Abstract

Boron-doped diamond (BDD) electrodes have a wide potential window and can produce ozone by water electrolysis at high voltage. Though ozone has strong oxidative power (standard oxidation potential: 2.07 V vs. NHE), it cannot decompose certain types of recalcitrant organic matter completely. We developed an advanced oxidation process (AOP), in which hydroxy radicals with stronger oxidative power (standard oxidation potential: 2.85 V vs. NHE) are formed using a combination of ozone, photocatalyst, and UV. In this study, we fabricated a mesoporous TiO₂/BDD hybrid electrode and examined its potential for AOPs. A synergetic effect between electrochemical water treatment and photocatalytic water treatment was observed with the hybrid electrode that did not occur with the BDD electrode.

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Synergetic effect in water treatment with mesoporous TiO₂/BDD hybrid electrode†

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