| 二氧化钛干凝胶热分解及热处理对表面有机官能团变化的影响 |
| Effect of Heat Decomposition Process and Thermal Treatment for TiO2 Xerogel Powder on Surface Organic Functional Groups |
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| 摘要: 利用X射线衍射(XRD)、差示扫描量热法(DSC)、红外光谱(FTIR)、X射线光电子能谱(XPS)等技术手段研究了溶胶-凝胶(sol-gel)法制备的二氧化钛干凝胶粉末在不同温度下煅烧后表面成分和结构变化，并对不同煅烧温度的粉末样品表面有机官能团的种类及所占的比例进行了探讨。结果表明：二氧化钛干凝胶粉末随着煅烧温度的提高，O-Ti-O结构逐步由复杂的无序网链状结构向有序的晶体结构转变，粉末表面的有机官能团中羧基通过反应产生的螯合物影响二氧化钛晶化；在200~300 ℃温度范围二氧化钛表面存在大量羟基；300 ℃左右羧基螯合物分解，在350 ℃时，憎水碳链官能团已基本除去，在300~350 ℃，有机官能团加速减少。 |
| 关键词: 二氧化钛干凝胶 热处理 表面有机官能团 羟基 |
| 基金项目: |
| Abstract: The changes of component and structure on the surface of TiO2 xerogel powder prepared by sol-gel method were chariterized at several temperature stages by XRD, DSC, FTIR, XPS techniques. Types and proportions of organic functional groups on the surface of powder were studied at different calcination temperatures. The results show that when the calcination temperature increases, O-Ti-O structure transfers from the unordered complex reticulation and chain structure to the ordered crystal one. Surface carboxyl chelate compound is one of the important factors affecting TiO2 crystallization, 200~300 ℃ is the effective temperature range in which quantities hydroxyl can exist. Carboxyl chelate compound starts decomposing at about 300 ℃ , hydrophobic carbon chain groups are eliminated at 350 ℃, and the rate of organic molecules elimination is accelerated significantly at 300~350 ℃. |
| Keywords: TiO2 xerogel thermal treatments surface organics functional groups hydroxyl |
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| 吴 伟,席文君.二氧化钛干凝胶热分解及热处理对表面有机官能团变化的影响[J].无机化学学报,2011,27(4):659-665. |
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