哌啶类离子液体表面活性剂为模板制备介孔二氧化硅
Preparation of mesoporous silica with piperidinium-based ionic liquid surfactant as templates
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摘要: 以哌啶类离子液体表面活性剂N-十六烷基-N-甲基哌啶溴盐([C16MPip]Br)为模板,正硅酸乙酯(TEOS)为硅源,在碱性环境下,通过水热合成法制备出形貌可控的介孔二氧化硅。研究了[C16MPip]Br/TEOS和NH4OH/TEOS物质的量之比、水合温度、煅烧温度等反应条件对介孔二氧化硅结构的影响。采用小角X射线衍射(XRD)、傅里叶红外(FTIR)、N2吸附-脱附和透射电子显微镜(TEM)对所制备的介孔二氧化硅样品进行了结构表征。结果表明,介孔二氧化硅的结构受反应条件的影响,在[C16MPip]Br/TEOS和NH4OH/TEOS物质的量之比分别为0.32和13,水合温度为25℃,煅烧温度为550℃时,[C16MPip]Br作为模板可以制备出规则有序的介孔二氧化硅MCM-41,其比表面积约为1000 m2/g,孔径约为2.5 nm。
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关键词:
- 哌啶类离子液体表面活性剂 /
- 介孔二氧化硅 /
- 模板 /
- 水热合成法 /
- 煅烧温度
Abstract: Ionic liquid surfactant N-hexadecyl-N-methylpiperidinium bromide ([C16MPip]Br) was used as a template to prepare mesoporous silica with controllable morphology in alkaline medium via hydrothermal method. The influence of the [C16MPip]Br/TEOS and NH4OH/TEOS molar ratios, hydration temperature and calcination temperature on the synthesis of mesoporous silica were analyzed. Small angle X-ray diffraction (XRD), nitrogen adsorption-desorption, Fourier transform infrared (FTIR) and transmission electron microscopy (TEM) were respectively employed to characterize the structure of prepared mesoporous silica. The results showed that the structure of mesoporous silica could be changed by the reaction conditions. Ordered mesoporous silica MCM-41 could be prepared with [C16MPip]Br as templates, and the specific surface area and pore diameter were about 1000 m2/g and 2.5 nm when the molar ratio of [C16MPip]Br/TEOS and NH4OH/TEOS were 0.32 and 13, the hydration temperature was 25 ℃, and the calicination temperature was 550 ℃.-
Key words:
- ionic liquid surfactant /
- mesoporous silica /
- template /
- hydrothermal method /
- calcination temperature
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