Chitosan-silica complex membranes from sulfonic acid functionalized silica nanoparticles for pervaporation dehydration of ethanol-water solutions.
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.
Liu
Ying-Ling
YL
Department of Chemical Engineering and R&D Center for Membrane Technology, Chung Yuan Christian University, Chungli, Taoyuan 320, Taiwan. ylliu@cycu.edu.tw
Hsu
Chih-Yuan
CY
Su
Yu-Huei
YH
Lai
Juin-Yih
JY
D048271:Chitosan / Q000737:chemistry*; D003681:Dehydration; D000431:Ethanol / Q000737:chemistry*; D008567:Membranes, Artificial; D015394:Molecular Structure; D049329:Nanostructures / Q000737:chemistry; D009942:Organometallic Compounds / Q000138:chemical synthesis*; D012822:Silicon Dioxide / Q000737:chemistry*; D012996:Solutions / Q000737:chemistry; D013451:Sulfonic Acids / Q000737:chemistry*; D013696:Temperature; D014835:Volatilization; D014867:Water / Q000737:chemistry
D008567:Membranes, Artificial; D009942:Organometallic Compounds; D012996:Solutions; D013451:Sulfonic Acids; D014867:Water; D000431:Ethanol; D012822:Silicon Dioxide; D048271:Chitosan