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以羟乙基纤维素(HEC)、正硅酸乙酯(TEOS)为原料,通过溶胶-凝胶法制备了不同TEOS含量的新型有机-无机杂化膜。通过红外(FT-IR)、热重(TG)等分析手段对膜进行了表征,并以不同浓度的甲醇水溶液测试了杂化膜的渗透汽化分离性能。结果表明:TEOS的加入有效改善了膜的尺寸稳定性和热力学性能;随着TEOS的加入,膜通量先下降后上升,分离因子则相反。当TEOS添加量为15wt%时,膜的分离因子最高达到819;用阿伦尼乌斯等式分析了温度与渗透汽化性能之间的关系,结果,甲醇与水的活化能分别是68.16kJ/mol、24.76kJ/mol,表明甲醇的温度敏感性高于水,因此分离因子随着温度的升高而降低,通量则增加。
New organic-inorganic hybrid membranes with different TEOS content were prepared by sol-gel method using hydroxyethyl cellulose (HEC) and tetraethyl orthosilicate (TEOS) as raw materials. The membranes were characterized by means of FT-IR and TG, and the pervaporation separation performance of hybrid membranes was tested with different concentrations of methanol aqueous solution. The results show that the addition of TEOS can effectively improve the dimensional stability and thermodynamic properties of the membrane. With the addition of TEOS, membrane flux decreases first and then increases, but the separation factor is opposite. The membrane separation factor up to 819 when TEOS addition was 15wt%. The relationship between temperature and pervaporation performance was analyzed by Arrhenius equation. The activation energies of methanol and water were 68.16kJ / mol, 24.76kJ / mol, indicating that the temperature sensitivity of methanol is higher than that of water, so the separation factor decreases with increasing temperature and the flux increases.