Abstract
A porous TiO2 material consisting of self-supported nano-flakes with mixed anatase/rutile phases was prepared by acid-etching of a glass-ceramic derived from 20MgO•24CuO•32TiO2•24P2O5 phosphate glass frit. The analysis showed that selective dissolution of components of CuO, Mg3(PO4)2, MgTi4(PO4)6 in the crystallized sample first occurred, followed by the growth of TiO2 nano-flakes and the formation of Ti(HPO4)2•2H2O phase due to the supply of Ti4+ and [PO4]3- released form the dissolved crystallites. The sample acid-treated for 17 h had the best crystallization of anatase and rutile phases, and the smallest band gap. In addition, the porous skeleton showed excellent thermal stability and a large surface area. The present study provided a new method which could be used for the scale-up production of porous TiO2.
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