Enhanced photocatalytic activity of TiO2-xNx loaded with copper ions under visible light irradiation

被引:130
作者
Morikawa, Takeshi [1 ]
Irokawa, Yoshihiro [1 ]
Ohwaki, Takeshi [1 ]
机构
[1] Toyota Cent Res & Dev Labs Inc, Nagakute, Aichi 4801192, Japan
关键词
photocatalysis; nitrogeri-doped TiO2; visible light; acetaldehyde; photooxidation; carbon dioxide; metal loading; copper; nitrogen doping; antibacterial; bactericidal;
D O I
10.1016/j.apcata.2006.08.011
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Nitrogen-doped TiO2 (TiO2-x,N-x,) photocatalysts loaded with various transition metal ions, including Cu, Pt, Ni, Zn and La, were prepared using a wet impregnation method. Photocatalytic activity of the catalysts under visible light irradiation(lambda > 410 nm) for acetaldehyde oxidation was examined. As a result, it was found that photocatalytic activity over TiO2-xNx (concentration of nitrogen was found to be similar to 0.25 at.%) was markedly enhanced by Cu or Pt loading, while Ni, Zn or La loaded TiO2-xNx showed similar photodegradation rate to the bare TiO2-xNx. Among them, the enhancement effect of Cu ion was found highest. The optimum concentration of Cu was found to be 0.5 wt%, and X-ray photoelectron spectroscopy (XPS) and X-ray induced Auger electron spectroscopy (XAES) analyses suggested the presence Of Cu2O or Cu hydroxides on the catalyst surface. In terms of the long-term stability of the catalysts, it was confirmed that more than 2100 mu mol Of CO2 was produced when acetaldehyde was continuously photooxidized over 1100 mu mol of Cu loaded TiO2-xNx under visible light for 100 consecutive days (> 410 nm, 0.9 mW/cm(2), in a 1 L vessel). (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:123 / 127
页数:5
相关论文
共 53 条
[1]  
AOKI K, 2005, PHOTOCATALYTIC ADV O, P59
[2]   Role of Cu in the Cu-TiO2 photocatalytic degradation of dihydroxybenzenes [J].
Araña, J ;
Rodríguez, CF ;
Díaz, OG ;
Melián, JAH ;
Peña, JP .
CATALYSIS TODAY, 2005, 101 (3-4) :261-266
[3]   Gas-phase ethanol photocatalytic degradation study with TiO2 doped with Fe, Pd and Cu [J].
Araña, J ;
Doña-Rodríguez, JM ;
González-Díaz, O ;
Rendón, ET ;
Melián, JAH ;
Colón, G ;
Navío, JA ;
Peña, JP .
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, 2004, 215 (1-2) :153-160
[4]   Visible-light photocatalysis in nitrogen-doped titanium oxides [J].
Asahi, R ;
Morikawa, T ;
Ohwaki, T ;
Aoki, K ;
Taga, Y .
SCIENCE, 2001, 293 (5528) :269-271
[5]   Preparation, characterization, and activity of Cu/TiO2 catalysts .1. Influence of the preparation method on the dispersion of copper in Cu/TiO2 [J].
Boccuzzi, F ;
Chiorino, A ;
Martra, G ;
Gargano, M ;
Ravasio, N ;
Carrozzini, B .
JOURNAL OF CATALYSIS, 1997, 165 (02) :129-139
[6]   Preparation, characterization, and activity of Cu/TiO2 catalysts .2. Effect of the catalyst morphology on the hydrogenation of 1,3-cyclooctadiene and the CO-NO reaction on Cu/TiO2 catalysts [J].
Boccuzzi, F ;
Chiorino, A ;
Gargano, M ;
Ravasio, N .
JOURNAL OF CATALYSIS, 1997, 165 (02) :140-149
[7]   THE ROLE OF METAL-ION DOPANTS IN QUANTUM-SIZED TIO2 - CORRELATION BETWEEN PHOTOREACTIVITY AND CHARGE-CARRIER RECOMBINATION DYNAMICS [J].
CHOI, WY ;
TERMIN, A ;
HOFFMANN, MR .
JOURNAL OF PHYSICAL CHEMISTRY, 1994, 98 (51) :13669-13679
[8]   Surface characterisation of metal ions loaded TiO2 photocatalysts:: structure-activity relationship [J].
Di Paola, A ;
García-López, E ;
Marcì, G ;
Martí, C ;
Palmisano, L ;
Rives, V ;
Venezia, AM .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2004, 48 (03) :223-233
[9]   Photocatalytic degradation of organic compounds in aqueous systems by transition metal doped polycrystalline TiO2 [J].
Di Paola, A ;
García-López, E ;
Ikeda, S ;
Marcì, G ;
Ohtani, B ;
Palmisano, L .
CATALYSIS TODAY, 2002, 75 (1-4) :87-93
[10]   Preparation of polycrystalline TiO2 photocatalysts impregnated with various transition metal ions:: Characterization and photocatalytic activity for the degradation of 4-nitrophenol [J].
Di Paola, A ;
Marcì, G ;
Palmisano, L ;
Schiavello, M ;
Uosaki, K ;
Ikeda, S ;
Ohtani, B .
JOURNAL OF PHYSICAL CHEMISTRY B, 2002, 106 (03) :637-645