复合模板剂下有序介孔TiO_2的制备研究
Synthesis of Ordered Mesoporous TiO_2 on a Composite Surfactant template
查看参考文献12篇
文摘
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在复合模板剂聚氧化烯十二烷基醚(Brij35)和聚乙二醇(PEG)下,制备出有序介孔TiO2。用XRD、HRTEM、SEM、FT-IR和N2吸附脱附等方法进行表征;并通过对反应过程中电导率和粘度的连续监测,分析有序介孔TiO2形成过程。研究表明,介孔TiO2为规整的六方排列结构,在低于400℃焙烧,有序结构稳定性高,比表面积达252m^2·g^-1,孔径3.4nm,晶型为锐钛矿;经500℃焙烧,有序介孔结构破坏,并开始出现金红石型晶相。有序介孔TiO2形成过程是基于在高极性介质中非极性的碳氢链聚集成为胶束,同时钛酸丁酯(TBOT)在已形成的胶束上聚庥,在酸作用下不断水解缩聚而形成有序介孔结构,有效控制水解和聚合过程是控制介孔材料结构形成的关键。 |
其他语种文摘
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On a composite surfactant template(Brij35 and PEG), ordered mesoporous TiO2 was synthesized successfully. The formation of the ordered mesoporous TiO_2 was analyzed by continuously monitoring the conductivity and viscosity during the reaction process, the ordered mesoporous TiO_2 formed was characterized by XRD, HRTEM, SEM, FT-IR and N2 adsorption and desorption methods. The results indicated that ordered mesoporous TiO_2 was of a hexagonal packed structure, at a temperature below 400 t, ordered mesoporous TiO_2 has a higher thermal stability and a higher surface area of 252 m~2 · g~(-1), the mesoporous pore diameter was uniform with a value of 3. 4 nm and the crystal was in anatase phase. After TiO_2 was calcined at 500 t, ordered mesoporous structure was destroyed somewhat, and the formation of rutile phase appeared. The results also showed that liquid crystal template played a key role for the reaction, especially in a high polar media, in which non-polar carbon-hydrogen chain easily coagulated forming micelle, and TBOT gathered around the micelle formed, when they were acted by acid, reaction took place gradually to generate ordered mesoporous structure TiO_2. It was found that taking efficient measures to control the hydrolysis and condensation processes of the reaction was the key of forming ordered mesoporous structure TiO_2. |
来源
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物理化学学报
,2003,19(3):251-255 【核心库】
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关键词
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介孔TiO2
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复合模板剂
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电导率
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粘度
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胶束
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地址
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1.
东北大学理学院材料物理系, 沈阳, 110004
2.
中国科学院金属研究所, 沈阳, 110016
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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1000-6818 |
学科
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化学工业 |
基金
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国家973计划
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文献收藏号
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CSCD:1293232
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