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

摘要: 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 benzoic employed photodecomposition in aqueous suspension. After calcinations at 973 K, physisorbed water layers recovered relatively fast P25, F4, AMT-600 (shorter than 24 h) no significant enhancement decomposition. On other hand, ST-01, UV-100, AMT-100, recovery was very slow (longer 1 week) only partially reversible, decomposition considerably enhanced but retarded rehydration. In presence adsorbed water, binding a carboxyl group molecules is considered to compete direct adsorption surface, which reduces amount results reduction efficiency. addition, photo...