| Title |
Synthesis and application of novel hydroxylated thia-crown ethers as composite ionophores for selective recovery of Ag+ from aqueous sources |
|
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 (芒聢录280 wt%) via wet-incipient technique with glutaraldehyde acetalization. Adsorption results of all TCE@PP reveal high Ag+ capacities with qe 芒聢录124芒聙聯179 mg g芒聢聮1, excellent Ag+ selectivities with Kd 芒聢录291芒聙聯778 L g芒聢聮1 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 芒聢录53芒聙聯86% at feed Co = 1.5 mM. Density functional theory calculations reveal that DH19-TCE4 had the closest cavity size (芒聢聟c = 2.35 脙聟) with Ag+ (芒聢聟Ag+ = 2.30 脙聟), the most negative binding energy (BE = 芒聢聮65.76 kcal mol芒聢聮1), 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 |
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Mindanao State
University - Iligan Institute of Technology