Preparation of TiO₂ nano-particle photocatalysts by a multi-gelation method: the effect of pH change

Authors: Neppolian, B.¹; Eddy, D.R.¹; Sakai, S.¹; Okada, Y.²; Nishijima, H.²; Anpo, M.³

Source: Research on Chemical Intermediates, Volume 34, Number 1, 2008 , pp. 103-111(9)

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Abstract:

TiO₂ photocatalysts were prepared by a multi-gelation method and the effect of the changes in the pH during the pH swing times, i.e., by a controlled pH swing, on the morphology of the TiO₂ particles was investigated. The photocatalytic properties of the TiO₂ catalysts prepared by controlled pH swing were compared with TiO₂ particles prepared without adjusting the pH during the swing times. The photocatalytic degradation reaction of these TiO₂ catalysts was investigated by comparing their effectiveness in 2-propanol oxidation. The experimental results showed that the TiO₂ photocatalysts prepared without adjusting the pH performed better in controlling the important parameters of the catalysts such as particle size, surface area, anatase/rutile phase ratio and pore size, as well as pore volume than the TiO₂ photocatalysts prepared by a controlled pH swing method.

Keywords: TIO2 PHOTOCATALYSTS; PH SWING METHOD; PHOTOCATALYTIC DEGRADATION OF 2-PROPANOL

Document Type: Research article

DOI: http://dx.doi.org/10.1163/156856708783359540

Affiliations: 1: Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Gakuen-Cho, Sakai, Osaka 599-8531, Japan 2: Chiyoda Corporation, R & D Centre, 3-13 Moriya-Cho, Kanagawa, Yokohama 221-0022, Japan 3: Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Gakuen-Cho, Sakai, Osaka 599-8531, Japan;, Email: anpo@chem.osakafu-u.ac.jp

Publication date: 2008-01-01