静电自组装制备海泡石负载纳米TiO_2复合光催化材料研究  

Preparation and Photocatalytic Activity of Sepiolite Supported Nano TiO_2 Composite Photocatalysts Prepared by Electrostatic Self Assembly Method

作　　者：李艳[1] 王程[1,2] 杜国强[1] 

机构地区：[1]石家庄经济学院材料科学与工程研究所,河北石家庄050031 [2]同济大学先进土木工程材料教育部重点实验室,上海200092

出　　处：《高校化学工程学报》2011年第5期871-876,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：河北省自然科学基金(E2008000537);河北省科学技术研究与发展指导计划项目(07215156)资助

摘　　要：选用一维孔结构的海泡石矿物为载体,以TiCl4为钛源,采用静电自组装方法制备了海泡石负载纳米TiO2复合光催化材料。利用X射线衍射(XRD)、红外光谱(IR)和扫描电子显微镜(SEM)等分析方法对材料的结构及微观形貌等进行了表征。通过对甲基橙染料的溶液脱色降解来评价材料的光催化性能,考察了焙烧温度、硅烷偶联剂用量等对材料结构和光催化性能的影响。结果表明:海泡石负载纳米TiO2光催化材料对甲基橙具有吸附与光催化的协同作用;静电自组装方法可有效提高复合材料的光催化性能,紫外光照1 h后,硅烷改性量6%,300℃焙烧的光催化材料对甲基橙溶液的脱色率达88.07%,比传统方法制备的材料对甲基橙溶液的脱色效果高16%以上。制备的光催化材料具有更好的稳定性及可循环利用性。Sepiolite surpported nano TiO2 composite photocatalysts were prepared by electrostatic self-assembly method （ESAM） with titanium tetrachloride as Ti-precursor. X-ray diffraction （XRD）, infrared spectroscopy （IR） and scanning electronic microscope （SEM） were employed to characterize the crystal structure and morphology of the prepared samples. The photocatalytic activity of the samples was evaluated by the degradation of methyl orange （MO） in water solution under ultraviolet light irradiation. The effects of the calcination temperature and silane dosage used on the structure and photocatalytic activity of the samples were investigated. The results show that the photocatalysts play a synergistic effect of adsorption and photocatalysis on methyl orange. Photocatalyst calcined at 300~C with sepiolite modified by 6 %（wt） silane has the optimal photocatalytic property; the decoloration ratio of the MO solution reaches to 88.07% after illumination for I h, which is 16% higher than that of the photocatalysts prepared by traditional method. The photocatalysts prepared by ESAM method have a relatively excellent stability and recycle property.

关 键 词：静电自组装 海泡石 纳米TIO2 光催化材料 

分 类 号：O643.36[理学—物理化学] TQ426.68[理学—化学]