膜科学与技术

聚合溶胶粒径对铌掺杂的有机无机杂化SiO2膜气体分离性能的影响

作者：林丹丹，宋华庭，朱瓌之，陈加伟，漆虹

单位：南京工业大学膜科学技术研究所，材料化学工程国家重点实验室，南京 210009

关键词：铌掺杂有机无机杂化SiO2膜；溶胶-凝胶法；溶胶粒径；气体分离

出版年,卷(期):页码： 2016,36(1):23-29

摘要：

以1，2-二（三乙氧基硅基）乙烷（BTESE）和五正丁氧基铌为前驱体，采用聚合溶胶路线，制备出三种粒径分布（平均粒径为5 nm，8 nm，11 nm）的铌掺杂的有机无机杂化SiO2（Nb-Hybrid SiO2）聚合溶胶。通过TG/DSC、XRD、CO2吸附和单组分气体渗透实验等手段，详细考察了聚合溶胶粒径对铌掺杂的有机无机杂化SiO2粉体和气体分离膜性能的影响。结果表明：采用平均粒径为5 nm的聚合溶胶，制备得到完整无缺陷的气体分离膜，膜的H2渗透率为8.36×10-8 mol•m-2•s-1•Pa-1，H2/CO2的理想分离因子为23。当采用平均粒径大于8 nm的溶胶制膜时，膜的H2/CO2理想分离因子降低。

Three Nb-Hybrid SiO2 sols (the average size is 5 nm, 8 nm, 11 nm, respectively) were successfully synthesized via polymeric route with 1, 2-bis(triethoxysilyl) ethane (BTESE) and niobium penta(n)butoxide as precursors. The effect of polymeric sol size on single gas permeability was investigated in detail. The properties of Nb-Hybrid SiO2 powders, as well as Nb-Hybrid SiO2 membranes were characterized by thermogravimetric and differential scanning calorimeter, X-ray diffraction, carbon dioxide adsorption and gas separation test. Results showed that a defect-free Nb-hybrid silica membrane was fabricated by using the sol with an average size of 5 nm. Single hydrogen permeance and H2/CO2 permselectivity of this membrane was 8.36×10-8 mol·m-2·s-1·Pa-1 and 23, respectively. The reduced H2/CO2 permselectivity of NS membranes was observed, which were prepared by using sols with average sizes larger than 8 nm.

作者简介：林丹丹（1990-），女，山东济宁人，硕士研究生，用于气体分离的微孔陶瓷膜的制备及表征.＊通讯作者，E-mail: hqi@njtech.edu.cn

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