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Titolo:
Modification of ceramic membranes by alcohol adsorption
Autore:
Dafinov, A; Garcia-Valls, R; Font, J;
Indirizzi:
Univ Rovira & Virgili, Dept Engn Quim, Escola Tecn Super Engn Quim, Tarragona 43006, Catalunya, Spain Univ Rovira & Virgili Tarragona Catalunya Spain 43006 6, Catalunya, Spain
Titolo Testata:
JOURNAL OF MEMBRANE SCIENCE
fascicolo: 1, volume: 196, anno: 2002,
pagine: 69 - 77
SICI:
0376-7388(20020215)196:1<69:MOCMBA>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
ALUMINA MICROPOROUS MEMBRANES; GAMMA-ALUMINA; SURFACE SITES; PERMEABILITY;
Keywords:
ceramic membrane; membrane separation; nanofiltration; membrane modification; alcohol adsorption; isoelectric point;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Font, J Univ Rovira & Virgili, Dept Engn Quim, Escola Tecn Super Engn Quim, Carretera de Salou S-N, Tarragona 43006, Catalunya, Spain Univ Rovira & Virgili Carretera de Salou S-N Tarragona Catalunya Spain 43006
Citazione:
A. Dafinov et al., "Modification of ceramic membranes by alcohol adsorption", J MEMBR SCI, 196(1), 2002, pp. 69-77

Abstract

This study aims at modifying ceramic membranes by means of alcohol chemisorption. Composite ceramic membranes with a skin layer of gamma -alumina were used. First, the adsorption of several alcohol on powdered gamma -aluminawas investigated emphasising the thermal stability of the adsorbed compounds. Later, a commercial gamma -alumina membrane was modified by alcohol adsorption. The permeability of water and several organic compounds was obtained for both the non-modified and modified ceramic membrane. Also, its isoelectric point was determined. The results prove that all the alcohol were readily adsorbed on powdered gamma -alumina not only physically but also chemically forming an alkoxide. The chemisorbed alcohol was stable up to 200 degreesC. Beyond this temperature, the alkoxide breaks up releasing the alcohol although the alkoxide also can react yielding an olefin or ether. The ceramic membrane was also successfully modified by alcohol adsorption. The layer of chemisorbed alcohol imparts hydrophobic characteristics to the membrane surface, so water permeability decreases significantly. This cannot be merely explained by pore size reduction due to the adsorbed layer. Thermal treatment at 250 degreesC recovered original permeability with only minor damage to the membrane. (C) 2002 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/04/20 alle ore 23:17:06