Journal
Title | Synthesis and application of novel hydroxylated thia-crown ethers as composite ionophores for selective recovery of Ag+ from aqueous sources Posted by Francis Kirby Burnea |
Authors | Hiluf T Fissaha, Grace M Nisola, Francis Kirby Burnea, Jin Yong Lee, Sangho Koo, Soong-Peong Lee, Kim Hern, Wook-Jin Chung |
Publication date | 2020/1/25 |
Journal | Journal of Industrial and Engineering Chemistry |
Volume | 81 |
Pages | 415-426 |
Publisher | Elsevier |
Abstract | Selective recovery of silver ions Ag+ has been a big challenge due to its difficult separation from complex aqueous feed streams. Herein, four novel highly selective 13- to 19-membered thia-crown ethers (TCEs) were successfully developed by intermolecular cyclization of S- and O-containing intermediates. The TCEs have reactive hydroxyl group(s) for coating on solid supports. To evaluate their ability to capture Ag+, the TCEs were coated on polypropylene (PP) membrane (TCE@PP) at high loading (â¼280 wt%) via wet-incipient technique with glutaraldehyde acetalization. Adsorption results of all TCE@PP reveal high Ag+ capacities with qe â¼124â179 mg gâ1, excellent Ag+ selectivities with Kd â¼291â778 L gâ1 and rapid uptake rate within 1 h. But DH19-TCE4 or 19TCE@PP is the most effective as it achieved 96% Ag+ complexation compared with others â¼53â86% at feed Co = 1.5 mM. Density functional theory calculations reveal that DH19-TCE4 had the closest cavity size (â c = 2.35 Ã ) with Ag+ (â Ag+ = 2.30 Ã ), the most negative binding energy (BE = â65.76 kcal molâ1), and the least cavity distortion during Ag+ complexation. All adsorbents are reusable and stable with consistent performance even after five cycles of adsorption/desorption runs. Overall results demonstrate the effectiveness of the synthesis strategies for TCEs and their high potential as adsorbents, especially DH19-TCE4, for selective Ag+ recovery from aqueous sources. |
Index terms / Keywords | AdsorbentsSeparationSelectivitySilverThia-crown ethers |
DOI | AdsorbentsSeparationSelectivitySilverThia-crown ethers |
URL | https://www.sciencedirect.com/science/article/abs/pii/S1226086X19305106 |