Effect of solute adsorption properties on its separation from supercritical carbon dioxide with a thin porous silica membrane

Tomoyuki Fujii, Yoshihiro Tokunaga, Kozo Nakamura, Yoshihisa Nakano, Shozaburo Kitaoka, Yoshinori Tanigawa

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

A thin porous silica membrane (average pore size of 3.3 mm) was prepared by the sol–gel method and used to separate the solute from supercritical carbon dioxide. The characteristics of solute permeation were investigated in respect of the adsorption properties of the solute, the desorption rate of the solute from the membrane being measured and the potential energy of solute near the silica surface being calculated by the molecular modeling technique. It was found that caffeine was strongly adsorbed to the surface and then slowly desorbed to form an adsorption layer, making the pores narrower and causing a molecular-sieving effect. Therefore, the rejection value was positive. On the other hand, the rejection value of n-octanoic acid, which was well adsorbed and rapidly desorbed, was negative. It is presumed that the molecules filled the pores due to their potential energy and were then forced to flow through the pores by the transmembrane pressure.

Original languageEnglish
Pages (from-to)1945-1949
Number of pages5
JournalBioscience, Biotechnology and Biochemistry
Volume60
Issue number12
DOIs
Publication statusPublished - 1996 Jan
Externally publishedYes

Keywords

  • Adsorption
  • Membrane separation
  • Molecular modeling
  • Silica membrane
  • Supercritical carbon dioxide

ASJC Scopus subject areas

  • Biotechnology
  • Analytical Chemistry
  • Biochemistry
  • Applied Microbiology and Biotechnology
  • Molecular Biology
  • Organic Chemistry

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