Abstract
AbstractMetal ion adsorbents are indispensable materials for the recovery of noble metal ions in a sustainable society. Herein, we report that poly(isopyrazole‐3,5‐diyl‐trans‐vinylene) (1) effectively adsorbed group 10 metal ions from solution in acetonitrile. Owing to its fully π‐conjugated and rigid structure, polyimine1was virtually insoluble in common organic solvents and water, making it advantageous for metal ion adsorption via a solid/liquid interface. Inductively coupled plasma (ICP) analysis showed that ≥90 % of Ni2+, Pd2+, and Pt2+ions were adsorbed at a concentration of 10 μM (order of ≤2 ppm) after stirring suspensions at room temperature. Metal ion desorption was achieved by treatment with ethylenediaminetetraacetic acid disodium salt (EDTA ⋅ 2Na), and the adsorbent was reused. Theoretical calculations supported that the desolvation energy was an important factor for effective adsorption in acetonitrile.
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