Liu Yong-Jun, Aizawa Mami, Wang Zheng-Ming, Hatori Hiroaki, Uekawa Naofumi, Kanoh Hirofumi
Department of Environmental Science and Engineering, Sichuan University, Chengdu 610065, Sichuan, China.
J Colloid Interface Sci. 2008 Jun 15;322(2):497-504. doi: 10.1016/j.jcis.2008.03.034. Epub 2008 Mar 20.
Titanium dioxide nanocrystalline particles were synthesized by peroxo titanium acid (PTA) approach from titanium alkoxide and inorganic salt precursors, and their structural and surface properties, porosities, and photocatalytic activities were comparatively examined by XRD, TG/DTA, DRIFT, UV-vis, low temperature N(2) adsorption, and methyl orange (MO) degradation. It was found that nanoparticles with single anatase phase can be obtained from alkoxide precursor even near room temperature if synthesis conditions are appropriately controlled. PTA-derived anatase nanoparticles from titanium alkoxide precursor have smaller crystalline sizes and better porosities, and contain less amount of peroxo group and no organic impurities as compared to those from TiCl(4) precursor. The advantages in structural property, porosity, and surface properties (few deficiencies) lead to a much better photocatalytic activity for TiO(2) nanoparticles from titanium alkoxide precursor in comparison with those from TiCl(4) precursor.
采用过氧钛酸（PTA）法，以钛醇盐和无机盐前驱体为原料合成了二氧化钛纳米晶颗粒，并通过XRD、TG/DTA、DRIFT、UV-vis、低温N₂吸附和甲基橙（MO）降解等方法对其结构和表面性质、孔隙率及光催化活性进行了比较研究。结果表明，如果合成条件控制得当，即使在接近室温的条件下，也可由醇盐前驱体制得单一锐钛矿相的纳米颗粒。与由TiCl₄前驱体制得的二氧化钛纳米颗粒相比，由钛醇盐前驱体制得的PTA衍生锐钛矿纳米颗粒具有更小的晶体尺寸和更好的孔隙率，且过氧基团含量更少，无有机杂质。结构性质、孔隙率和表面性质方面的优势（缺陷较少）使得由钛醇盐前驱体制得的TiO₂纳米颗粒比由TiCl₄前驱体制得的TiO₂纳米颗粒具有更好的光催化活性。
