Abstract Membrane wetting in membrane gas absorption is undesirable as it reduces the gas transfer in wet pores. This work aims to understand the improvement of membrane hydrophobicity using fluoroalkyl silane and its effects on membrane properties, separation performance and membrane wetting by amine. Polyvinylidene fluoride/silicoaluminophosphate zeolite membranes were prepared using non-solvent induced phase separation technique and then immersed into a mixture of (3,3,3-trifluoropropyl) trimethoxysilane and ethanol solution (volume ratio of 1: 100) for 20 min. The post-modification resulted in a slight improvement of water contact angle and liquid entry pressure. Hence, the highest CO2 absorption flux of 4.48 ± 0.36 × 10−4 mol.m−2. s−1 was achieved using silanated membrane, about 25 % of improvement in comparison to the neat membrane. The absorption flux of humid gas was slightly reduced (-16 %) due to pore wetting. Fluoroalkyl silane could be used to prevent water wetting, resulting improvement of CO2 absorption. The membranes were immersed in diethanolamine solution (2 M) for 50 h before characterization using goniometer, Fourier transform infrared spectroscopy and scanning electron microscope. The incorporation of zeolite reduced membrane wetting because membrane swelling could be prevented. The unfavorable interaction between fluoroalkyl and amine groups induced severe membrane wetting by amine.

中文翻译：

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疏水性硅烷改性聚偏二氟乙烯/磷酸硅铝沸石膜对膜气体吸收的胺润湿评价

摘要 膜气体吸收中的膜润湿是不可取的，因为它减少了湿孔中的气体传递。本工作旨在了解使用氟烷基硅烷改善膜疏水性及其对膜性能、分离性能和胺对膜润湿的影响。采用非溶剂诱导相分离技术制备聚偏二氟乙烯/磷酸硅铝沸石膜，然后将其浸入（3,3,3-三氟丙基）三甲氧基硅烷和乙醇溶液（体积比为1:100）的混合物中20分钟。后修改导致水接触角和液体进入压力略有改善。因此，最高的 CO2 吸收通量为 4.48 ± 0.36 × 10−4 mol.m−2。s-1 是使用硅烷化膜实现的，与纯膜相比提高了约 25%。由于孔隙润湿，潮湿气体的吸收通量略有降低 (-16 %)。氟烷基硅烷可用于防止水润湿，从而改善 CO2 吸收。在使用测角仪、傅里叶变换红外光谱和扫描电子显微镜进行表征之前，将膜浸入二乙醇胺溶液 (2 M) 中 50 小时。沸石的加入降低了膜润湿性，因为可以防止膜膨胀。氟代烷基和胺基团之间的不利相互作用导致胺严重润湿膜。在使用测角仪、傅里叶变换红外光谱和扫描电子显微镜进行表征之前，将膜浸入二乙醇胺溶液 (2 M) 中 50 小时。沸石的加入降低了膜润湿性，因为可以防止膜膨胀。氟代烷基和胺基团之间的不利相互作用导致胺严重润湿膜。在使用测角仪、傅里叶变换红外光谱和扫描电子显微镜进行表征之前，将膜浸入二乙醇胺溶液 (2 M) 中 50 小时。沸石的加入降低了膜润湿性，因为可以防止膜膨胀。氟代烷基和胺基团之间的不利相互作用导致胺严重润湿膜。