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Photocatalytic Cr(VI) Reduction with a Photoanode for Hydrogen Production  

Shim, Eun-Jung (Dept. of Chemistry, Chungnam Nat'l Univ.)
Park, Youn-Bong (Dept. of Chemistry, Chungnam Nat'l Univ.)
Bae, Sang-Hyun (Dept. of Environ. Engr., Yonsei Univ.)
Yoon, Jae-Kyung (Fossil Energy & Environment Research Dept., Korea Institute of Energy Research)
Joo, Hyun-Ku (Fossil Energy & Environment Research Dept., Korea Institute of Energy Research)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.18, no.4, 2007 , pp. 452-457 More about this Journal
Abstract
Titanium foil and mesh(anodized tubular $TiO_2$ electrode, ATTE) were anodized in a bath at $5^{\circ}C$ with 20V external bias applied, then annealed at different temperatures($450^{\circ}C{\sim}850^{\circ}C$) to obtain tubular $TiO_2$ on the Ti substrate. The prepared sample was used to investigate rate of hydrogen production as well as Cr(VI) reduction. The ATTEs annealed at relatively lower temperatures showed higher activity than those at relatively higher temperatures. In particular, the Cr(VI) reduction was pH-dependent. To improve photocatalytic Cr(VI) reduction with the ATTEs, two configurations, fixing foil type and rotating mesh type, were also compared. As a result, the rotating mesh type was much more effective for Cr(VI) reaction than the former due to the more efficient use of the light. In the rotating type reactor, as the rotating speed increased, the rate of the Cr(VI) reduction was getting faster.
Keywords
Anodized tubular $TiO_2$ electrode(ATTE); $H_2$ production; Cr(VI) reduction; fixed plate; rotating mesh;
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