Hydrogen peroxide route to Sn-doped titania photocatalysts.
Hydrogen peroxide route to Sn-doped titania photocatalysts.
复制标题
DOI：
10.1186/1752-153x-6-113
复制
发表时间：
2012-10-05
影响因子：
--
通讯作者：
Kormunda M
中科院分区：
文献类型：
--
作者：
Stengl V;Grygar TM;Henych J;Kormunda M
该工作旨在通过Sn离子的修饰和一种原始、简单的合成方法来提高二氧化钛在可见光照射下的光催化活性。锡掺杂二氧化钛催化剂是通过在 SnCl4 或 SnCl2 存在下热水解钛过氧络合物水溶液来制备的，采用原始的、专有的“一锅”合成法，不使用有机溶剂、金属有机前体、高压釜老化或合成后煅烧。通过粉末衍射、XPS、紫外可见分光光度、红外和拉曼光谱、电子显微镜以及表面积和孔隙率测量对产品进行了详细表征。合成混合物中锡的存在有利于以锐钛矿为代价形成金红石和板钛矿，降低了所有形成的二氧化钛多晶型物的粒径，并通过吸收边红移和引入新发色团将二氧化钛的光吸收扩展到>400 nm的可见光区域。通过Orange II染料在水溶液中的分解动力学测试了二氧化钛在紫外光照射和>400 nm光下的光催化活性。Sn掺杂提高了二氧化钛在紫外光下的光活性，并且由于Sn掺杂二氧化钛粉末增加的比表面积和相异质性，在>400 nm光下提供了相当大的光活性。
The work aims at improving photocatalytic activity of titania under Vis light irradiation using modification by Sn ions and an original, simple synthesis method. Tin-doped titania catalysts were prepared by thermal hydrolysis of aqueous solutions of titanium peroxo-complexes in the presence of SnCl4 or SnCl2 using an original, proprietary "one pot" synthesis not employing organic solvents, metallo-organic precursors, autoclave aging nor post-synthesis calcination. The products were characterized in details by powder diffraction, XPS, UV–vis, IR, and Raman spectroscopies, electron microscopy and surface area and porosity measurements The presence of tin in synthesis mixtures favors the formation of rutile and brookite at the expense of anatase, decreases the particle size of all formed titania polymorphs, and extends light absorption of titania to visible light region >400 nm by both red shift of the absorption edge and introduction of new chromophores. The photocatalytic activity of titania under UV irradiation and >400 nm light was tested by decomposition kinetics of Orange II dye in aqueous solution Doping by Sn improves titania photoactivity under UV light and affords considerable photoactivity under >400 nm light due to increased specific surface area and a phase heterogeneity of the Sn-doped titania powders.