Chitosan-silica complex membranes from sulfonic acid functionalized silica nanoparticles for pervaporation dehydration of ethanol-water solutions.
Chitosan-silica complex membranes from sulfonic acid functionalized silica nanoparticles for pervaporation dehydration of ethanol-water solutions.
复制标题
DOI：
10.1021/bm049531w
复制
发表时间：
2005
影响因子：
6.2
通讯作者：
Ying‐Ling Liu;Chih-Yuan Hsu;Yu-Huei Su;J. Lai
中科院分区：
文献类型：
--
作者：
Ying‐Ling Liu;Chih-Yuan Hsu;Yu-Huei Su;J. Lai
以含磺酸基的纳米SiO2（ST-GPE-S）为壳聚糖的交联剂，制备了壳聚糖-SiO2复合膜，并将其应用于乙醇-水溶液的渗透汽化脱水。ST-GPE-S是由纳米级二氧化硅颗粒与缩水甘油基苯基醚反应，随后磺化到连接的苯基上而获得的。用FTIR、（1）H NMR和能量色散X射线衍射对功能化二氧化硅的化学结构进行了表征。用电子显微镜观察到二氧化硅颗粒在壳聚糖中均匀分散，所得膜被认为是纳米复合材料。膜中的二氧化硅纳米粒子作为高分子链的间隔物，为水的渗透提供了额外的空间，从而使复合膜具有较高的渗透速率。在壳聚糖中加入5份/100份的功能化二氧化硅，所得膜在70 ℃下对90wt%乙醇水溶液的渗透蒸发脱水中表现出919的分离因子和410 g/（m2）h的渗透通量。
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.