Al-containing porous titanium dioxide networks: Sol-gel synthesis within agarose gel template and photocatalytic activity

作者：Huang Fuzhi; Zhou Meifang; Cheng Yi Bing; Caruso Rachel A^*

来源：Chemistry of Materials, 2006, 18(25): 5835-5839.

DOI：10.1021/cm060833

Al-containing titania porous networks have been produced by conducting sol-gel chemistry within the porous structures of agarose gels. The use of the agarose template gives inorganic materials with a homogeneous macroporous structure. The amount of aluminum added to the titania system was studied from 0 to 10 wt % (where wt % corresponds to the (Al2O3 x 100)/(Al2O3 + TiO2) expected from the initial precursor concentrations), and the morphology and crystallization behavior (as a function of both wt % of Al2O3 and heating temperature) were characterized along with a study of the photocatalytic efficiency of the materials. The 4 wt % sample was found to have the highest photocatalytic activity observed for the photodecomposition of aqueous methylene blue. For low doping amounts, 0.5 and 1 wt % Al2O3, the rutile phase of titania was not observed in the samples heated to 780 degrees C. Above 4 wt % Al2O3, the temperature required for the anatase to rutile phase transformation increased with increasing amounts of aluminum.

• 出版日期2006-12-12