胶原纤维为模板制备Gd掺杂纤维状二氧化钛及光催化性能研究

以胶原为模板剂、硫酸钛为钛源、硝酸钆为掺杂源制备了钆掺杂纤维结构TiO_2(Gd-TiO_2)。通过扫描电镜(SEM)、X射线衍射仪(XRD)、紫外可见漫反射光谱(UV-Vis-DRS)、X射线光电子能谱(XPS)对样品的表面形貌、晶相组成、紫外吸收带、元素组成及化合价态进行了分析。以甲基橙为目标降解物,研究了样品的光催化性能并确定钆的最佳掺杂量。结果表明:600℃煅烧温度下2%Gd-TiO_2纤维结构完好、光催化效果最好,光反应30 min后其降解率达到91. 89%,比起未掺杂试样大大提高。钆掺杂会改变TiO_2的晶粒尺寸并能够抑制TiO_2从锐钛矿相向金红石相转变,掺杂后紫外吸收带发生蓝移。

Preparation and Photocatalytic Performance of Fibrous Gd-Doped TiO2 Using Collagen Fiber as Template

Fibrous Gd-doped TiO 2 was prepared by using collagen as the template, titanium sulfate as the titanium source and gadolinium nitrate as the doping source. The morphology, crystal phase composition, ultraviolet absorption band and element composition and valence were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), ultravioletvisible diffuse reflection spectrum (UV-Vis-DRS), and X-ray photoelectron spectroscopy (XPS), respectively. The photocatalytic performance was evaluated by the following degradation of methyl orange, and the optimal doping amount of Gd 3+ was determined. The results show that a perfect fiber structure is preserved, and the best photocatalytic property is obtained when the doping amount is 2% with a calcination at 600 ℃. The degradation rate of methyl orange reaches 91.89% after 30 min, which is much higher than that of undoped one. Gd-doping changes the grain size of the sample, inhibits transformation of titanium dioxide from anatase into rutile phase, and makes a blue shift of the UV absorption band.