| TiO2-SiO2复合气凝胶：常压干燥制备及性能表征 |
| TiO2-SiO2 Composite Aerogel: Preparation by Ambient Pressure Drying Process and Characterization |
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| 摘要: 以廉价的四氯化钛和工业水玻璃为原料，通过溶胶-凝胶法制得TiO2-SiO2复合湿凝胶，用三甲基氯硅烷(TMCS)/乙醇(EtOH)/正己烷(Hexane)混合溶液对湿凝胶进行改性，常压干燥制备了TiO2-SiO2复合气凝胶。利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、红外光谱(FTIR)、X射线衍射(XRD)及N2吸附/脱附法对复合气凝胶的形貌和性质进行了分析。结果表明，TiO2-SiO2复合气凝胶具有连续多孔结构，150 ℃干燥后复合气凝胶的比表面积为1 076 m2·g-1，孔体积为4.96 cm3·g-1；经550 ℃热处理后，复合气凝胶仍然具有高的孔隙率，比表面积为856 m2·g-1，孔体积为3.46 cm3·g-1。吸附和光催化降解罗丹明B的结果表明，复合气凝胶同时具有较好的吸附和光催化性能，其吸附/光催化协同作用活性优于纯SiO2气凝胶和锐钛矿TiO2粉末；且重复利用四次降解率仍然可达到89%。 |
| 关键词: TiO2-SiO2 气凝胶 常压干燥 吸附 光催化 |
| 基金项目: |
| Abstract: Using cheap titanium tetrachloride and industrial waterglass as raw materials, TiO2-SiO2 composite aerogels were prepared via an ambient pressure drying process, by using Trimethylchlorosilane /Ethanol/Hexane solution to modify the sol-gel-derived TiO2-SiO2 wet gel. The morphology and properties of the aerogels were characterized by SEM, TEM, FTIR, XRD and N2 adsorption-desorption measurement. The results indicate that the obtained TiO2-SiO2 composite aerogels exhibit a porous structure, with a specific surface area of 1 076 m2·g-1 and pore volume of 4.96 cm3·g-1 after dried at 150 ℃. Moreover, the composite aerogels still show high porosity after calcined at 550 ℃, with a specific surface area of 856 m2·g-1 and pore volume of 3.46 cm3·g-1. The results of adsorption and photocatalytic degradation of rhodamine B show that TiO2-SiO2 composite aerogels have both good adsorption and photocatalytic properties. The synergistic adsorption/photocatalysis activity of TiO2-SiO2 composite aerogels was better than pure SiO2 aerogels and pure anatase TiO2 powder. Additionally, the adsorption/photocatalytic degradation rate is still up to 89% after being used for four times. |
| Keywords: TiO2-SiO2 aerogel ambient pressure drying adsorption photocatalysis |
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| 冷小威,刘敬肖,史 非,殷 澍,佐藤次雄.TiO2-SiO2复合气凝胶：常压干燥制备及性能表征[J].无机化学学报,2009,25(10):1791-1796. |
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