Liu Ying-Ling, Hsu Chih-Yuan, Su Yu-Huei, Lai Juin-Yih
Department of Chemical Engineering and R&D Center for Membrane Technology, Chung Yuan Christian University, Chungli, Taoyuan 320, Taiwan.
Biomacromolecules. 2005 Jan-Feb;6(1):368-73. doi: 10.1021/bm049531w.
Nanosized silica particles with sulfonic acid groups (ST-GPE-S) were utilized as a cross-linker for chitosan to form a chitosan-silica complex membranes, which were applied to pervaporation dehydration of ethanol-water solutions. ST-GPE-S was obtained from reacting nanoscale silica particles with glycidyl phenyl ether, and subsequent sulfonation onto the attached phenyl groups. The chemical structure of the functionalized silica was characterized with FTIR, (1)H NMR, and energy-dispersive X-ray. Homogeneous dispersion of the silica particles in chitosan was observed with electronic microscopies, and the membranes obtained were considered as nanocomposites. The silica nanoparticles in the membranes served as spacers for polymer chains to provide extra space for water permeation, so as to bring high permeation rates to the complex membranes. With addition of 5 parts per hundred of functionalized silica into chitosan, the resulting membrane exhibited a separation factor of 919 and permeation flux of 410 g/(m(2) h) in pervaporation dehydration of 90 wt % ethanol aqueous solution at 70 degrees C.
具有磺酸基团的纳米二氧化硅颗粒（ST-GPE-S）被用作壳聚糖的交联剂，以形成壳聚糖-二氧化硅复合膜，并将其应用于乙醇-水溶液的渗透汽化脱水。ST-GPE-S是通过纳米级二氧化硅颗粒与缩水甘油基苯基醚反应，然后在连接的苯基上进行磺化反应而获得的。通过傅里叶变换红外光谱（FTIR）、核磁共振氢谱（¹H NMR）和能量色散X射线对功能化二氧化硅的化学结构进行了表征。通过电子显微镜观察到二氧化硅颗粒在壳聚糖中均匀分散，所得到的膜被视为纳米复合材料。膜中的二氧化硅纳米颗粒充当聚合物链的间隔物，为水渗透提供额外空间，从而使复合膜具有高渗透速率。在壳聚糖中添加百分之五的功能化二氧化硅时，所得膜在70℃下对90 wt%乙醇水溶液进行渗透汽化脱水时，分离因子为919，渗透通量为410 g/(m² h)。
