双功能改性的T型分子筛膜用于有机溶剂脱水

将3-氨丙基三乙氧基硅烷（APTES）引入到T型分子筛膜表面，用以修饰多晶膜合成过程中产生的缺陷。X射线衍射、场发射扫描电子显微镜、X射线光电子能谱和FT-IR等方法的表征结果显示，APTES通过“键合”的形式被成功地修饰到膜表面上。APTES层起到2个作用：一是提高膜的亲水性；二是减少膜层的缺陷。将修饰后的膜应用在348 K、90%的异丙醇水溶液的脱水时，该膜表现出比较高的分离因子和通量。该方法重复性良好，5个修饰后的膜样品的选择性平均增加了大约8倍（从359±23增加到2 934±183），而渗透通量仅仅从（3.52±0.10） kg·m^-2·h^-1降低到（3.06±0.14） kg·m^-2·h^-1（减少13.07%）。在363 K下，修饰的膜经过100 h的连续测试，膜渗透测得的水含量均可达到99.50%以上，表明修饰后的膜性能较稳定。

Difunctional Effects of Organo-Modified T-Type Zeolite Membranes for Dewatering from Organic Solution

3-aminopropyltriethoxysilane (APTES) was introduced to modify the surface of T-type zeolite membranes. Characterizations, such as X-ray diffraction, field-emission scanning electron microscopy, X-ray photoelectron spectroscopy and FT-IR, demonstrated that APTES was successfully modified on the membrane surface by chemical bonding. The modified APTES plays two roles:one is to improve the membrane hydrophilicity and the other is to reduce the defects of membrane layer. The modified membranes showed a high separation factor and water flux for the dewatering of a 90% isopropyl alcohol solution at 348 K. This method showed good reproducibility, and five modified membranes demonstrated an increased separation factor by about 8 times (from 359±23 to 2 934±183), and a slightly decreased total flux from (3.52±0.10) kg·m^-2·h^-1 to (3.06±0.14) kg·m^-2·h^-1 (a decrease of 13.07%). At 363 K, during 100 h of continuous testing, the modified membrane was very stable, and the permeation side retained a high-water content above 99.50% with a feed solution of 90% isopropyl alcohol.