Application of immobilized nanotubular TiO2 electrode for photocatalytic hydrogen evolution: Reduction of hexavalent chromium (Cr(VI)) in water

被引:71
作者
Yoon, Jaekyung [1 ]
Shim, Eunjung [2 ]
Bae, Sanghyun [3 ]
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
关键词
Cr(VI); Photocatalytic reduction; Photocatalytic hydrogen evolution; Immobilized nanotubular TiO2; ENVIRONMENTAL-POLLUTANT CR(VI); LIGHT ILLUMINATION; AQUEOUS-SOLUTIONS; TITANIUM-DIOXIDE; ARRAYS; DEGRADATION; SUSPENSION; OXIDATION; CHROMATE; REMOVAL;
D O I
10.1016/j.jhazmat.2008.04.057
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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.
引用
收藏
页码:1069 / 1074
页数:6
相关论文
共 31 条
[1]   An overview on semiconductor particulate systems for photoproduction of hydrogen [J].
Ashokkumar, M .
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 1998, 23 (06) :427-438
[2]   Enzymatic hydrogen production by light-sensitized anodized tubular TiO2 photoanode [J].
Bae, Sanghyun ;
Shim, Eunjung ;
Yoon, Jaekyung ;
Joo, Hyunku .
SOLAR ENERGY MATERIALS AND SOLAR CELLS, 2008, 92 (04) :402-409
[3]   Nano-titania assisted photoreduction of Cr(VI) The role of the different TiO2 polymorphs [J].
Cappelletti, G. ;
Bianchi, C. L. ;
Ardizzone, S. .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2008, 78 (3-4) :193-201
[4]   Removal of toxic metal ions from wastewater by semiconductor photocatalysis [J].
Chen, D ;
Ray, AK .
CHEMICAL ENGINEERING SCIENCE, 2001, 56 (04) :1561-1570
[5]   Potential hazards of hexavalent chromate in our drinking water [J].
Costa, M .
TOXICOLOGY AND APPLIED PHARMACOLOGY, 2003, 188 (01) :1-5
[6]   Titanium oxide nanotube arrays prepared by anodic oxidation [J].
Gong, D ;
Grimes, CA ;
Varghese, OK ;
Hu, WC ;
Singh, RS ;
Chen, Z ;
Dickey, EC .
JOURNAL OF MATERIALS RESEARCH, 2001, 16 (12) :3331-3334
[7]   Photocatalytic degradation of some organic sulfides as environmental pollutants using titanium dioxide suspension [J].
Habibi, MH ;
Vosooghian, H .
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 2005, 174 (01) :45-52
[8]  
JESSEN H, 2004, J NANOPART RES, V6, P519
[9]   Photocatalytic reduction of environmental pollutant Cr(VI) over some semiconductors under UV/visible light illumination [J].
Khalil, LB ;
Mourad, WE ;
Rophael, MW .
APPLIED CATALYSIS B-ENVIRONMENTAL, 1998, 17 (03) :267-273
[10]   Photocatalytic reduction of Cr(VI) in aqueous solutions by UV irradiation with the presence of titanium dioxide [J].
Ku, Y ;
Jung, IL .
WATER RESEARCH, 2001, 35 (01) :135-142