A novel approach to mesoporous anatase TiO2: Oxidation of TiC by nitric acid

作者：Shieh Dong Lin; Li Jr Sheng; Shieh Ming Jr; Lin Jong Liang^*

来源：Microporous and Mesoporous Materials, 2007, 98(1-3): 339-343.

DOI：10.1016/j.micromeso.2006.09.039

• nitric acid
• titanium carbide
• titanium dioxide
• mesoporous materials

TiO2 has been prepared by a novel, mild one-step reaction between TiC and aqueous HNO3 at 70 degrees C. This material possesses an anatase crystal form and a narrow pore-size distribution of mesoporous channels. The BET surface area, average pore diameter, and total pore volume are 332.7 m(2)/g, 3.28 nm, and 0.23 cm(3)/g, respectively. Our method is a template-free synthesis process, distinct from sol-gel methods for mesoporous TiO2 fabrication using structure-directing surfactants or polymers. TiO2 is not generated from TiC reacting with other acids and oxidants, such as HCl, H2SO4, H3PO4, KMnO4, K2Cr2O7, Na2S2O7, H2O2, and Na2CrO4, at a similar reaction condition. Since the average particle size of the mesoporous TiO2 produced is much larger than that of the TiC starting material, the mechanism for the formation of the mesoporous TiO2 is not via mesopore-etching of TiC particles and transformation of TiC pore walls into TiO2 by HNO3. It is likely that TiC is first transformed into TimXn species, followed by hydrolysis to form mesoporous TiO2.

• 出版日期2007-1-5