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

• Published in: RSC advances Vol. 10; no. 3; pp. 1793 - 1798
• Main Authors: Suzuki, Norihiro, Okazaki, Akihiro, Kuriyama, Haruo, Serizawa, Izumi, Hirami, Yuki, Hara, Aiga, Hirano, Yuiri, Nakabayashi, Yukihiro, Roy, Nitish, Terashima, Chiaki, Nakata, Kazuya, Katsumata, Ken-ichi, Kondo, Takeshi, Yuasa, Makoto, Fujishima, Akira
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 08.01.2020; The Royal Society of Chemistry
• Subjects: Boron; Chemistry; Diamonds; Electrode potentials; Electrodes; Electrolysis; Organic matter; Oxidation; Ozone; Photocatalysis; Titanium dioxide; Water treatment
• ISSN: 2046-2069
• DOI: 10.1039/c9ra10318j

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.