Yan Maocheng, Chen Feng, Zhang Jinlong, Anpo Masakazu
Lab for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P.R. China.
J Phys Chem B. 2005 May 12;109(18):8673-8. doi: 10.1021/jp046087i.
Nanocrystalline TiO(2) catalysts with different anatase/rutile ratios and high surface area (113-169 m(2)/g) have been prepared at low temperature by the microemulsion-mediated hydrothermal method. The samples were characterized by x-ray diffraction (XRD), Fourier transform (FT)-IR spectra, UV-vis diffuse reflectance spectra, and nitrogen adsorption-desorption methods. The contents of anatase and rutile phases in the TiO(2) powders have been successfully controlled by simply changing the proportion of Cl(-) and SO(4)(2-) in the aqueous phase of the microemulsion. A proposed mechanism involving bidentately chelated sulfate is discussed to explain the variation of the crystalline phase in the TiO(2) powder. The photodegradation of methyl orange (MO) in water has been investigated over titanium dioxide consisting of different anatase/rutile ratios. The catalyst containing 74.2% anatase showed the highest photocatalytic activity, which is due to a synergistic effect between anatase and rutile. The synergism was also found for the photodegradation of MO with physically mixed anatase and rutile as catalysts.
采用微乳液介导的水热法在低温下制备了具有不同锐钛矿/金红石比例且高比表面积（113 - 169 m²/g）的纳米晶TiO₂催化剂。通过X射线衍射（XRD）、傅里叶变换（FT）-红外光谱、紫外-可见漫反射光谱和氮吸附-脱附方法对样品进行了表征。通过简单改变微乳液水相中Cl⁻和SO₄²⁻的比例，成功控制了TiO₂粉末中锐钛矿相和金红石相的含量。讨论了一种涉及双齿螯合硫酸盐的机制，以解释TiO₂粉末中晶相的变化。研究了由不同锐钛矿/金红石比例组成的二氧化钛对水中甲基橙（MO）的光降解。含有74.2%锐钛矿的催化剂表现出最高的光催化活性，这归因于锐钛矿和金红石之间的协同效应。以物理混合的锐钛矿和金红石作为催化剂对MO进行光降解时也发现了这种协同作用。
