Journal
CATALYSIS TODAY
Volume 161, Issue 1, Pages 105-109Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2010.08.026
Keywords
TiO2; CO2 reduction; Photocatalysis; Kaolinite
Funding
- Czech Ministry of Education, Youth and Sports [MSM 6198910019]
- Czech Ministry of Industry and Trade [FT-TA4/025]
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The kaolinite/TiO2 composite was prepared using thermal hydrolysis of kaolinite/titanyl sulphate suspension and characterized by XRFS, XRPD, SEM and N-2 physical adsorption. Its photocatalytic properties were evaluated by photocatalytic reduction of CO2 by water and compared with commercial TiO2 photocatalyst Degussa P25. Results showed that the yields of CO2 photocatalytic reduction products methane and methanol were higher over a kaolinite/TiO2 composite than over commercial TiO2 (Degussa P25) in spite of smaller proportion of TiO2 in the composite. Introducing of TiO2 nanoparticles into the kaolinite structure caused a decrease of anatase crystallite size. Kaolinite can also change acidobasic properties of catalyst surface, inhibit the recombination of electron-hole pairs and prevent the formation of TiO2 aggregates in suspension. These facts can contribute to the observed higher photocatalytic efficiency of kaolinite/TiO2 compared to the commercial TiO2 photocatalyst. (C) 2010 Elsevier B.V. All rights reserved.
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