首页|Bio-Inspired phosphate adsorption by Copper-Decorated weak base anion exchanger
Bio-Inspired phosphate adsorption by Copper-Decorated weak base anion exchanger
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NSTL
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 Cu~(2+)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 Cu~(2+)ions mainly drove phosphate diffusion from the liquid to the resin and then induced the phosphate species to bond with multiple-NH_2~+/-NH groups.Such adsorption exhibited a high entropy(AS0 = 132.47 J/mol-K)and was highly exergonic(ΔG~0 =-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 Cu~(2+)-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.
NSTL
