| Abstract
| - In the present work, the local structure changes of microporous titanosilicate ETS-10 upon treatment withcitric acid, phosphoric acid, and nitric acid were characterized using XRD, FTIR, Raman, XPS, DR-UV, 29SiMAS NMR, and 1H−29Si CP MAS NMR techniques. The experimental results suggested that regardless ofthe nature of the acids, the replacement of alkali cations by protons altered the local structure of ETS-10solid, including partial dissolution of the siliceous matrix and leaching of titanium species from the TiO6chains. In the meantime, it was observed that the hexacoordinated Ti species of ETS-10 were changed topenta- and/or tetracoordinated ones, generating terminal TiOH groups, accounting for the observed enhancementof photodegradation activity of the acid-treated ETS-10 materials toward phenol compounds.
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