Effects of thermal treatments on the recovery of adsorbed water and photocatalytic activities of TiO2 photocatalytic systems

The Journal of Physical Chemistry. B
Atsuko Y NosakaYoshio Nosaka

Abstract

The effects of thermal treatments on the rehydration process and photocatalytic activity were investigated by 1H NMR spectroscopy for six anatase abundant TiO2 photocatalysts with different properties. Acetic acid and benzoic acid were employed for photodecomposition in aqueous suspension. After the calcinations at 973 K, physisorbed water layers recovered relatively fast for P25, F4, and AMT-600 (shorter than 24 h) with no significant enhancement of the photocatalytic decomposition. On the other hand, for ST-01, UV-100, and AMT-100, the recovery was very slow (longer than 1 week) and only partially reversible, and the photocatalytic decomposition was considerably enhanced but retarded with rehydration. In the presence of adsorbed water, the binding of a carboxyl group of the molecules with adsorbed water is considered to compete with the direct adsorption on the surface, which reduces the amount of the direct adsorption and results in the reduction in the photocatalytic efficiency. In addition, the photocatalytic decomposition of benzoic acid with an aromatic ring was much faster in all of the TiO2 aqueous suspensions and more enhanced for the fully dehydroxylated TiO2 than that of acetic acid. These results suggest that the m...Continue Reading

Citations

Nov 12, 2014·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Yoshio NosakaAtsuko Y Nosaka
Dec 14, 2007·Journal of Hazardous Materials·Chung-Hsin LuRohidas B Kale
May 16, 2014·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Juan F MontoyaPedro Salvador
Aug 23, 2012·The Journal of Physical Chemistry. B·Atsuko Y NosakaYoshio Nosaka
May 17, 2018·Physical Chemistry Chemical Physics : PCCP·Gabriel JeantelotJean-Marie Basset
Feb 7, 2021·Scientific Reports·Navarut PaengjunMakoto Ogawa
Oct 15, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Lorenzo MinoGianmario Martra
Jan 16, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Min-Kyo Lee, Young-Chun Park
Dec 15, 2006·The Journal of Physical Chemistry. B·Trung H TranYoshio Nosaka

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