Suppression of silver ion reduction by Al(NO3)3 complex and its application to highly stabilized olefin transport membranes

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

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22 Citations (Scopus)


It is well known that the reduction of AgBF4 to silver nanoparticles inevitably occurs over time even under dark conditions. In particular, the reduction rate of AgBF4 in a polymer/silver salt complex is much faster than for any other silver salt. However, when Al(NO3)3 was incorporated into a POZ/AgBF4 complex, the reduction of silver ion was suppressed for more than 14 days. Stable silver ions were confirmed by the separation performance of propylene/propane mixtures over time and by the color change of the POZ/AgBF4/Al(NO3)3 complex. FT-IR and FT-Raman spectroscopy showed that ionic aggregation between the silver ion of AgBF4 and NO3- of Al(NO3)3 occurred, which was much stronger in intensity than interactions in the POZ/Al(NO3)3 and POZ/AgNO3 complexes. This strong aggregation behavior was attributable to a favorable interaction between F- of AgBF4 and Al3+ of Al(NO3)3, resulting in a weakened interaction between Al3+ and its counteranions, which was confirmed by XPS.

Original languageEnglish
Pages (from-to)156-159
Number of pages4
JournalJournal of Membrane Science
Publication statusPublished - 2013 Oct 15

All Science Journal Classification (ASJC) codes

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

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