静电自组装制备坡缕石负载纳米TiO_2光催化材料

Preparation of Palygorskite Supported-nano Titanium Dioxide Photocatalysts by Electrostatic Self-assembly Method

为了实现纳米TiO2的固定化负载,提高材料的光催化性能,选用1维孔结构的坡缕石矿物为载体,以TiCl4为钛源,采用静电自组装方法制备了坡缕石负载纳米TiO2光催化材料.采用XRD(X射线衍射分析)、FT-IR(傅立叶变换红外谱仪)和SEM(扫描电镜)对材料进行分析和表征,采用甲基橙染料评价材料的光催化性能.重点考察了焙烧温度和硅烷偶联剂用量等对材料结构和性能的影响.研究表明:坡缕石负载纳米TiO2复合材料对甲基橙染料具有吸附与光催化的协同作用,采用静电自组装方法可有效提高材料的光催化性能和循环利用性能.

Electrostatic self-assembly method （ESAM） was used to prepare palygorskite supported-nano titanium dioxide photocatalysts for the sake of improving the recovery and photocatalytic efficiency of TiO2 with titanium tetrachloride as Ti-precurser. The as-prepared materials were characterized by X-ray diffraction （XRD）, fourier transform infrared spectroscopy （FT-IR）and scanning electron microscopy （SEM）. Methyl orange was used to estimate the photocatalytic acitivity of the materials. The effects of the calcination temperatures and silane dosage on themicrostructure and photocatalytic properties of the samples were investigated. The results show that the palygorskite supported-nano titanium dioxide photocatalysts exhibit a synergistic effect of adsorption and photocatalysis on methyl orange. Photocatalysts prepared by ESAM method exhibit higher photocatalytic activity and recycle ability than that prepared by the traditional method.