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Title:
METHOD FOR PRODUCING LIQUID DISPERSION OF NOBLE METAL-SUPPORTING PHOTOCATALYST PARTICLES, LIQUID DISPERSION OF NOBLE METAL-SUPPORTING PHOTOCATALYST PARTICLES, HYDROPHILIZING AGENT, AND PHOTOCATALYTIC FUNCTIONAL PRODUCT
Document Type and Number:
WIPO Patent Application WO/2011/068095
Kind Code:
A1
Abstract:
Disclosed are: a liquid dispersion of noble metal-supporting photocatalyst particles, which exhibits high photocatalytic activity and stable dispersibility, thereby being free from sedimentation of the photocatalyst particles in the dispersion medium; a method for producing the liquid dispersion of noble metal-supporting photocatalyst particles; a hydrophilizing agent; and a photocatalytic functional product. Specifically disclosed is a method for producing a liquid dispersion of noble metal-supporting photocatalyst particles, wherein noble metal-supporting photocatalyst particles, which are obtained by loading the surfaces of photocatalyst particles with a noble metal, are dispersed in a dispersion medium. The method for producing a liquid dispersion of noble metal-supporting photocatalyst particles comprises: (1) adjusting the pH of a starting material dispersion, in which the photocatalyst particles are dispersed and a precursor of the noble metal is dissolved in the dispersion medium, within the range of 2.8-5.5 and setting the dissolved oxygen concentration in the starting material dispersion to 1.0 mg/L or less; (2) irradiating the starting material dispersion with light that has energy not less than the band gap of the photocatalyst particles; and (3) adding a sacrificial agent to the starting material dispersion after the process (2) and further irradiating the resulting starting material dispersion with light that has energy not less than the band gap of the photocatalyst particles, thereby making the surfaces of the photocatalyst particles support the noble metal.

Inventors:
SOGABE KOHEI (JP)
ANDO HIROYUKI (JP)
SAKATANI YOSHIAKI (JP)
Application Number:
PCT/JP2010/071351
Publication Date:
June 09, 2011
Filing Date:
November 30, 2010
Export Citation:
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Assignee:
SUMITOMO CHEMICAL CO (JP)
SOGABE KOHEI (JP)
ANDO HIROYUKI (JP)
SAKATANI YOSHIAKI (JP)
International Classes:
B01J35/02; A61L9/00; A61L9/01; C09D1/00; C09D5/16; C09D7/12
Domestic Patent References:
WO1996029375A11996-09-26
WO1997000134A11997-01-03
WO1998003607A11998-01-29
Foreign References:
JP2009233575A2009-10-15
JP2005199187A2005-07-28
JP2000334265A2000-12-05
JP2005199204A2005-07-28
JPH0867835A1996-03-12
JPH0925437A1997-01-28
JPH10183061A1998-07-07
JPH10183062A1998-07-07
JPH10168349A1998-06-23
JPH10225658A1998-08-25
JPH111620A1999-01-06
JPH111661A1999-01-06
JP2002080829A2002-03-22
JP2004059686A2004-02-26
JP2004107381A2004-04-08
JP2004256590A2004-09-16
JP2004359902A2004-12-24
JP2005113028A2005-04-28
JP2005230661A2005-09-02
JP2007161824A2007-06-28
Other References:
SOLAR ENERGY MATERIALS AND SOLAR CELLS, vol. 51, no. 2, 1998, pages 203 - 209
Attorney, Agent or Firm:
TANAKA, Mitsuo et al. (JP)
Mitsuo Tanaka (JP)
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