Bio-Inspired phosphate adsorption by Copper-Decorated weak base anion exchanger

Biplab K. Mahata, Sue min Chang*, Purnendu Bose

*此作品的通信作者

研究成果: Article同行評審

5 引文 斯高帕斯(Scopus)

摘要

Hybrid-based phosphate adsorbents have high adsorption ability but are challenged with regeneration because of strong bonding. Inspired by phosphate-binding proteins (PBPs) which reached a trade-off between high adsorption and regeneration ability by binding phosphate species with multiple hydrogen bonds, a weak-base anion (WBA) exchange resin was decorated with Cu2+ ions to develop an alternative advanced phosphate adsorbent. Different from the role of metal species in the promoted adsorption of existing hybrid-based adsorbents, the Cu2+ ions mainly drove phosphate diffusion from the liquid to the resin and then induced the phosphate species to bond with multiple –NH2+/–NH groups. Such adsorption exhibited a high entropy (ΔS0 = 132.47 J/mol-K) and was highly exergonic (ΔG0 = -16.83 ∼ -20.14 kJ/mol). Moreover, it enhanced the phosphate selectivity because the driving force for the sorption process originated from the complexation. During the regeneration, the Cu2+-to-Cu-O- transformation could occur under weak alkaline conditions and repelled the adsorbed phosphate species to facilitate desorption. Therefore, the Cu-WBA resin not only exhibited high phosphate adsorptions (31.94 to 61.03 mg-P/g) and high competing-anion tolerance but also was successfully recovered with a diluted NaOH solution (0.05 N). Detailed adsorption behaviors under different pHs, temperatures, and interference of competing anions were examined, and the mechanisms were elucidated.

原文English
文章編號121339
期刊Separation and Purification Technology
296
DOIs
出版狀態Published - 1 9月 2022

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