纤蛇纹石/酸浸二氧化硅负载TiO_2复合材料的结构性能及其降解罗丹明B的实验研究

Structures of TiO_2-loaded chrysotile/leached silica composites and the experimental study of their photocatalytic decomposition properties of Rhodamine B

以天然纳米矿物纤蛇纹石和酸浸二氧化硅为载体,钛酸四丁酯为钛源,在室温条件下采用溶胶-凝胶法,制备了负载TiO_2的复合光催化材料。采用气体吸附、扫描电子显微镜(SEM)、X射线衍射(XRD)等方法对载体和不同温度煅烧得到的样品进行微观形貌和结构分析,并在紫外光照射下,以10 mg/L罗丹明B为目标污染物评价不同样品的光催化活性。结果表明,750℃煅烧的酸浸二氧化硅负载TiO_2复合材料的光催化性能最好,光照40 min对罗丹明B的去除率达到91.57%,载体良好的吸附能力能够促进污染物的降解。

In this study, TiO2 was loaded onto natural nano mineral chrysotile/leached silica by using hydrolysis of tetrabutyl titanate at room temperature using sol-gel method. The morphological properties and microstructure of the supporters and catalysts at different calcination temperatures were characterized by N2 adsorption/desorption, scanning electron microscopy （SEM） and X-ray diffraction （XRD）. The photocatalytic reactivities of these different catalysts were investigated by UV-assisted degradation of 10 mg/L Rhodamine B. The results show that the TiO2-loaded silica calcined at 750℃ exhibits significantly excellent reactivity with the removal rate of Rhodamine B up to about 91.57% after irradiation for 40 min, the good adsorption capabilities of the supporters can also contribute to the removal rate of Rhodamine B.