Highly Selective and Efficient Membrane Transport of Silver as AgBr-2 Ion Using K+-decyl-18-crown-6 as Carrier

Abstract

Potassium-decyl-18-crown-6 was used as a highly selective and efficient carrier for uphill transport of silver as AgBr2 -complex ion through a chloroform bulk liquid membrane. When thiosulfate anion was used as a metal ion acceptor in the receiving phase the amounts of silver transported across the liquid membrane after 120 and 180 min were 87.0 ± 1.8% and 96.0 ± 1.9%, respectively. The selectivity and efficiency of silver transport from aqueous solution containing Cu 2+ , Zn 2+ , Ni 2+ , Cd 2+ , Pb 2+ and Fe 3+ ions were investigated. In the presence of EDTA at pH = 4 as suitable masking agent in the source phase, the interfering effects of Pb 2+ and Fe 3+ ions were diminished drastically.

Bioavailability and Toxicokinetics of citrate-coated silver nanoparticles in rats

“…Only a few reports on the membrane transport mechanism of silver ions have been published, but they do not provide complete understanding of the topic. Highly selective and efficient membrane transport of silver as AgBr 2 − using K + -decyl-18-crown-6 as a carrier was reported (Zolgharnein et al, 2003). However, no report on the transport mechanism of AgNPs has been released.…”

The electronic spectrum of AgBr2: Ab initio benchmark vs. DFT calculations on the lowest ligand-field states including spin–orbit effects

“…Some studies have shown that silver may get imported through the cell membrane as the anionic form of AgBr 2 [1]. However, no studies have ever addressed the electronic structure of the lowest (ligand-field) states of the neutral molecule, which can be formed by the Ag + Br 2 ?…”