Dehydration of an ethanol/water azeotrope by novel organic - Inorganic hybrid membranes based on quaternized chitosan and tetraethoxysilane

Tadashi Uragami, Takuya Katayama, Takashi Miyata, Hiroshi Tamura, Tadashi Shiraiwa, Akon Higuchi

Research output: Contribution to journalArticlepeer-review

90 Scopus citations

Abstract

To control swelling of quaternized chitosan (q-Chito) membranes, mixtures of q-Chito as an organic component and tetraethoxysilane (TEOS) as an inorganic component were prepared using the sol-gel reaction, and novel q-Chito/TEOS hybrid membranes were formed. In the separation of an ethanol/water azeotrope by pervaporation, the effect of TEOS content on the water/ethanol selectivity of q-Chito/TEOS hybrid membranes was investigated. Hybrid membranes containing up to 45 mol % TEOS exhibited higher water/ethanol selectivity than the q-Chito membrane. This resulted from depressed swelling of the membranes by formation of a cross-linked structure. However, introduction of excess TEOS led to greater swelling of the hybrid membranes. Therefore, the water/ethanol selectivity of the hybrid membranes containing more than 45 mol % TEOS was lower than that of the q-Chito membrane. The relationship between the structure of q-Chito/TEOS hybrid membranes and their permeation and separation characteristics during pervaporation of an ethanol/water azeotrope is discussed in detail.

Original languageEnglish
Pages (from-to)1567-1574
Number of pages8
JournalBiomacromolecules
Volume5
Issue number4
DOIs
StatePublished - Jul 2004

Fingerprint

Dive into the research topics of 'Dehydration of an ethanol/water azeotrope by novel organic - Inorganic hybrid membranes based on quaternized chitosan and tetraethoxysilane'. Together they form a unique fingerprint.

Cite this