Effect of amino acids in polymer/silver salt complex membranes on facilitated olefin transport

Sang Wook Kang, Jong Hak Kim, Jongok Won, Kookheon Char, Yong Soo Kang

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


The effect of amino acids such as asparagine, valine, glutamic acid and glycine on silver ion activity as a olefin carrier in membrane consisting of silver ions dissolved in poly(2-ethyl-2-oxazoline) (POZ) has been investigated. The presence of amino acids leads to the weakened interaction of the silver ion with its counteranion resulting from the electrostatic interaction between counteranion and NH3+ of amino acids, as confirmed by FT-IR spectra. As a result, the mixed gas permeances and selectivities of propylene/propane through POZ/AgBF4 or POZ/AgNO3 membranes intriguingly increased upon addition of the amino acids. However, the improvement of separation performance is strongly dependent on the type and the concentration of amino acids. Among the amino acids tested, the presence of asparagine containing amide group was found to improve the separation performance of the membranes most significantly. On the other hand, the performance of membrane with lysine containing amine group was the lowest, indicating the amine is not the effective ligand for silver ion in facilitated olefin transport membranes.

Original languageEnglish
Pages (from-to)201-206
Number of pages6
JournalJournal of Membrane Science
Issue number1-2
Publication statusPublished - 2005 Feb 15

Bibliographical note

Funding Information:
The authors acknowledge the financial support from the Ministry of Science and Technology of Korea through the Creative Research Initiatives Program. Kookheon Char also acknowledges the financial support from the National Research Laboratory Program (Grant M1-0104-00-0191) and the Ministry of Education through the Brain Korea 21 Program of Seoul National University.

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation


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