Pervaporation dehydration of aqueous solutions of various types of molecules via organosilica membranes: Effect of membrane pore sizes and molecular sizes
Pervaporation dehydration of aqueous solutions of various types of molecules via organosilica membranes: Effect of membrane pore sizes and molecular sizes
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DOI：
10.1016/j.seppur.2018.06.021
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发表时间：
2018-12
影响因子：
8.6
通讯作者：
Norihiro Moriyama;Hiroki Nagasawa;M. Kanezashi;T. Tsuru
中科院分区：
文献类型：
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作者：
Norihiro Moriyama;Hiroki Nagasawa;M. Kanezashi;T. Tsuru
有机硅膜在水溶液中表现出良好的稳定性，在渗透汽化脱水中具有良好的应用前景。为了研究有机硅膜的渗透汽化性能，具有不同孔径的（双三乙氧基甲硅烷基）乙烷（BTESE）衍生的膜通过调节溶胶中酸的摩尔比，制备了两种不同粒径（0.44 nm和0.54 nm）的膜，并将所得膜应用于各种单一气体的气体渗透（He、H2、CO2、N2、CH 4、CF 4和SF6）以及水溶液（甲醇、乙醇、正丙醇、异丙醇、正丁醇、叔丁醇、丙酮和n-甲基-2-吡咯烷酮）的渗透蒸发脱水。两种膜都显示出高水平的水渗透率（>10− 6 mol/（m2 s Pa））和水/异丙醇的分离因子（500-6000）。渗透蒸发和气体渗透的渗透率都随着分子尺寸的增大和孔径的减小而减小，这证实了分子筛效应的贡献。渗透汽化性能与气体渗透性能相关。
Organosilica membranes were developed and showed excellent stability in aqueous solutions, which raised expectation for applications to pervaporation dehydration. In order to investigate the properties of pervaporation through organosilica membranes, 1,2-(bistriethoxysilyl)ethane (BTESE)-derived membranes with different pore sizes (0.44 nm and 0.54 nm) were prepared by tuning the acid molar ratio in the sols, then applying the resultant membranes to the gas permeation of various single gases (He, H2, CO2, N2, CH4, CF4, and SF6) as well as to the pervaporation dehydration of aqueous solutions (methanol, ethanol, n-propanol, iso-propanol, n-butanol, tert-butanol, acetone, and n-methyl-2-pyrrolidone). Both membranes showed high levels of both water permeance (>10−6mol/(m2s Pa)) and separation factors for water/iso-propanol (500–6000). Both the permeances in pervaporation and in gas permeation tended to decrease with an increase in the molecular size and a decrease in the pore size, which confirmed the contribution of the molecular sieving effect. Pervaporation performance was correlated with gas permeation performance.