摘要
以阳离子Gemini表面活性剂——双十六烷基三甲基溴化铵[C16H33N+(CH3)2(CH2)2N+(CH3)2C16H33].2Br-(G16-2-16)为模板剂,正硅酸乙酯为硅源,在n(SiO2)∶n(G16-2-16)∶n(NH3)∶n(H2O)=1∶0.1∶9∶110的条件下,在弱碱性环境中用水热法合成了平均孔径3.1 nm、比表面积906.71 m2/g、孔容0.93 cm3/g、具有二维六角结构且高度有序的介孔氧化硅MCM-41。采用小角XRD、高分辨透射电镜(HRTEM)、N2吸附-脱附分析和热重-微分热重法(TG-DTG)对其结构进行了考察,分析了不同模板剂浓度对材料结构有序度的影响。结果表明,n(G16-2-16)/n(TEOS)=0.1时,合成的材料有序度最高。
Highly ordered hexagonal mesoporous silicas MCM -41 with average pore size 3.1 nm, BET surface area 906. 71 m^2/g and pore volume 0. 93 cm^3/g were successfully synthesized by hydrothermal method using cationic Gemini surfactants Bis-eetyltrimethylammonium bromide [ C16 H33 N + ( CH3 ) 2- ( CH2 ) 2-N + ( CH3 ) 2C16H33 ]·2Br- ( G16-2-16 ) as template, tetraethyl orthosilicate (TEOS) as silica sources and n ( SiO2 ) : n ( G16-2 - 16 ) : n ( NH3 ) : n ( H2 O) = 1:0. 1:9:110 in a weak alkaline system. The changes in composition and the structure of the silicon MCM - 41 were investigated by low-angle XRD, high-resolution TEM, nitrogen sorption measurements and thermogravimetric-derivative thermogravimetry. The results indicated that while the molar ratio of templating agent and silica sources was 0. 1 ,the degree of products was the highest.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2009年第5期438-441,共4页
Fine Chemicals
基金
陕西省教育厅重点项目(075C04)
陕西科技大学创新团队项目(SUST-B23)~~