摘要
以γ-甲基丙烯酰氧基丙基三甲氧基硅烷(A-174)代替部分正硅酸乙酯(TEOS)为前驱体,十六烷基三甲基溴化铵(CTAB)为有机模板剂,通过溶胶-凝胶-模板法制备疏水性的SiO_2膜。采用BET、DTG、IR、SEM及接触角测试仪等对膜材料进行表征,并进行了CH_4/CO_2分离性能及稳定性的评价。结果表明,疏水基团引入到SiO_2膜材料中,水接触角达到108.8°,膜材料具备良好的疏水性及稳定性,且模板剂的加入使膜材料孔结构更加发达,气体的渗透通量和透过选择性增大,更适合CH_4/CO_2气体分离。在压差80kPa时,CH_4渗透通量最大达到2.45×10-7 mol/(m2·s·Pa),CH_4/CO_2气体的分离因子最大达到2.67,高于Knudsen扩散理想分离因子1.66。
Hydrophobic silica membranes were prepared byγ-methacryloxypropyl groups through an acid-catalyzed andco-hydrolysis and a condensation reaction of tetraethoxysilane（TEOS）andγ-methacryloxypropyltrimethoxylsilane（A-174）with template CTAB（C_（19）H_（42）NBr）by sol-gel method.The membranes were characterized by BET,DTG,IR,XRD,SEM and the measurement of contact angle.The CH4/CO2 permselectivity and the hydrothermal stability of membranes were also investigated in the humidity environments.The results showed that the membranes had a higher stability through the modification of hydrophobic group onto the surface with the water contact angle of 108.8°,and had better property of gas permeation and separation with the templates add.With the pressure of 80 kPa,the gas permeation of CH_4 was 2.45×10-7 mol/（m^2·s·Pa）,and the CH4/CO2 separation factor approximated 2.67 which was higher than the theoretical Knudsen value 1.66.
出处
《化工新型材料》
CAS
CSCD
北大核心
2016年第6期148-151,共4页
New Chemical Materials
基金
辽宁省自然科学基金项目(2014020140)
辽宁省自然科学基金项目(2013020080)
关键词
SIO2膜
疏水性
模板剂
气体分离
稳定性
silica membrane
hydrophobic property
template
gas separation
stability
