A new method for the removal of arsenite [As(III)] and selenate [Se(VI)], which are difficult to remove by conventional water treatment methods from aqueous media, was investigated. This method involves the use of photocatalytic oxidation of As(III) and photocatalytic reduction of Se(VI). Also, a novel TiO2–adsorbent hybrid (HYB) which has photocatalyst sites and adsorbent sites on the same particle was developed. When the removal of As(III) by use of photocatalyst–adsorbent system and the HYB system was carried out, As(III) was effectively removed from aqueous phase. Moreover, with the removal of Se(VI) by using photocatalytic reduction, Se(VI) could also be removed from aqueous phase under the photocatalyst–adsorbent system and the HYB system, even if the concentration of a hole scavenger formic acid was reduced.
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Research Article|
February 01 2012
Removal of arsenic and selenium compounds from aqueous media by using TiO2 photocatalytic reaction Available to Purchase
T. Nakajima;
1Department of Chemistry, Biotechnology, and Chemical Engineering, Graduate School of Science and Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, Japan
E-mail: [email protected]
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H. Takanashi;
H. Takanashi
1Department of Chemistry, Biotechnology, and Chemical Engineering, Graduate School of Science and Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, Japan
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T. Tominaga;
T. Tominaga
1Department of Chemistry, Biotechnology, and Chemical Engineering, Graduate School of Science and Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, Japan
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K. Yamada;
K. Yamada
1Department of Chemistry, Biotechnology, and Chemical Engineering, Graduate School of Science and Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, Japan
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A. Ohki
A. Ohki
1Department of Chemistry, Biotechnology, and Chemical Engineering, Graduate School of Science and Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, Japan
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Water Supply (2012) 12 (1): 24–30.
Article history
Received:
November 27 2009
Accepted:
June 11 2010
Citation
T. Nakajima, H. Takanashi, T. Tominaga, K. Yamada, A. Ohki; Removal of arsenic and selenium compounds from aqueous media by using TiO2 photocatalytic reaction. Water Supply 1 February 2012; 12 (1): 24–30. doi: https://doi.org/10.2166/ws.2011.090
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