The origin of enhanced photocatalytic decomposition of ATP on TiO₂ powders as induced by surface modification with lanthanide ions: important roles of ATP adsorption to the modified surface

Authors: Sakaguchi, Nahomi; Yamada, Keiji; Matsuo, Shuji; Matsuo, Taku; Wakita, Hisanobu

Source: Research on Chemical Intermediates, Volume 32, Number 2, 2006 , pp. 171-182(12)

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Abstract:

Surface modification of TiO₂ powders with lanthanide salts (EuCl₃ or YbCl₃) enhanced photocatalytic decomposition of ATP. In comparison with the unmodified catalyst, a 3-fold increase in the ATP decay rate was observed with TiO₂ powders as prepared in 5 mM EuCl₃ (or YbCl₃) solution. The reason was ascribed to enrichment of ATP to TiO₂ powder with the lanthanide ions. Evidence was obtained by adsorption experiments where ATP concentration was monitored after dispersing TiO₂ powders into the solution. The ATP molecules adsorbed faster to TiO₂ powder and strongly stabilized there in the presence of Yb³⁺ than otherwise.

Keywords: TIO2; PHOTOCATALYST; LANTHANIDE ION; ATP; HPLC; SURFACE MODIFICATION; PHOTOCATALYTIC DECOMPOSITION; ADSORPTION PHENOMENA

Document Type: Research article

DOI: http://dx.doi.org/10.1163/156856706775372780

Publication date: 2006-02-01