Application of immobilized nanotubular TiO2 electrode for photocatalytic hydrogen evolution: Reduction of hexavalent chromium (Cr(VI)) in water
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作者:
Yoon, Jaekyung
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Korea Inst Energy Res, Climate Change Technol Res Div, Taejon 305343, South KoreaKorea Inst Energy Res, Climate Change Technol Res Div, Taejon 305343, South Korea
Yoon, Jaekyung
[1
]
Shim, Eunjung
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机构:
Chungnam Natl Univ, Dept Chem, Taejon 305764, South KoreaKorea Inst Energy Res, Climate Change Technol Res Div, Taejon 305343, South Korea
Shim, Eunjung
[2
]
Bae, Sanghyun
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Yonsei Univ, Dept Environm Engn, Wonju 220710, Gangwon Do, South KoreaKorea Inst Energy Res, Climate Change Technol Res Div, Taejon 305343, South Korea
Bae, Sanghyun
[3
]
Joo, Hyunku
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Korea Inst Energy Res, Climate Change Technol Res Div, Taejon 305343, South KoreaKorea Inst Energy Res, Climate Change Technol Res Div, Taejon 305343, South Korea
Joo, Hyunku
[1
]
机构:
[1] Korea Inst Energy Res, Climate Change Technol Res Div, Taejon 305343, South Korea
[2] Chungnam Natl Univ, Dept Chem, Taejon 305764, South Korea
[3] Yonsei Univ, Dept Environm Engn, Wonju 220710, Gangwon Do, South Korea
In this study, immobilized TiO2 electrode is applied to reduce toxic Cr(VI) to non-toxic Cr(III) in aqueous solution under UV irradiation. To overcome the limitation of powder TiO2, a novel technique of immobilization based on anodization was applied and investigated under various experimental conditions. The anodization was performed at 20V-5 degrees C for 45 min with 0.5% hydrofluoric acid, and then the anodized samples were annealed under oxygen stream in the range 450-850 degrees C. Based on the results of the experiments, the photocatalytic Cr(VI) reduction was favorable in acidic conditions, with similar to 98% of the Cr(VI) being reduced within 2 h at pH 3. Among the samples tested under same anodizing condition, the nanotubular TiO2 annealed at 450 and 550 degrees C showed highest reduction efficiencies of Cr(VI). In addition, the surface characterizations (zeta potential, XRD, and SEM) of these samples proved that the Cr(VI) reduction efficiency was higher under acidic conditions and at a lower annealing temperature. From this research, it was concluded that the anodized TiO2 has the potential to be a useful technology for environmental remediation as well as photocatalytic hydrogen production from water. (C) 2008 Elsevier B.V. All rights reserved.
机构:
Yonsei Univ, Dept Environm Engn, Wonju 220710, Gangwon Do, South KoreaKorea Inst Energy Res, Fossil Energy & Environm Res Dept, Taejon 305343, South Korea
Bae, Sanghyun
;
Shim, Eunjung
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机构:
Chungnam Natl Univ, Dept Chem, Taejon 305764, South KoreaKorea Inst Energy Res, Fossil Energy & Environm Res Dept, Taejon 305343, South Korea
Shim, Eunjung
;
Yoon, Jaekyung
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机构:
Korea Inst Energy Res, Fossil Energy & Environm Res Dept, Taejon 305343, South KoreaKorea Inst Energy Res, Fossil Energy & Environm Res Dept, Taejon 305343, South Korea
Yoon, Jaekyung
;
Joo, Hyunku
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机构:
Korea Inst Energy Res, Fossil Energy & Environm Res Dept, Taejon 305343, South KoreaKorea Inst Energy Res, Fossil Energy & Environm Res Dept, Taejon 305343, South Korea
机构:
NYU, Inst Canc, Sch Med, Dept Environm Med,Dept Pharmacol, New York, NY 10016 USANYU, Inst Canc, Sch Med, Dept Environm Med,Dept Pharmacol, New York, NY 10016 USA
机构:
Yonsei Univ, Dept Environm Engn, Wonju 220710, Gangwon Do, South KoreaKorea Inst Energy Res, Fossil Energy & Environm Res Dept, Taejon 305343, South Korea
Bae, Sanghyun
;
Shim, Eunjung
论文数: 0引用数: 0
h-index: 0
机构:
Chungnam Natl Univ, Dept Chem, Taejon 305764, South KoreaKorea Inst Energy Res, Fossil Energy & Environm Res Dept, Taejon 305343, South Korea
Shim, Eunjung
;
Yoon, Jaekyung
论文数: 0引用数: 0
h-index: 0
机构:
Korea Inst Energy Res, Fossil Energy & Environm Res Dept, Taejon 305343, South KoreaKorea Inst Energy Res, Fossil Energy & Environm Res Dept, Taejon 305343, South Korea
Yoon, Jaekyung
;
Joo, Hyunku
论文数: 0引用数: 0
h-index: 0
机构:
Korea Inst Energy Res, Fossil Energy & Environm Res Dept, Taejon 305343, South KoreaKorea Inst Energy Res, Fossil Energy & Environm Res Dept, Taejon 305343, South Korea
机构:
NYU, Inst Canc, Sch Med, Dept Environm Med,Dept Pharmacol, New York, NY 10016 USANYU, Inst Canc, Sch Med, Dept Environm Med,Dept Pharmacol, New York, NY 10016 USA