Bis‐Catecholamide‐Based Materials for Uranium Extraction

Abstract

This work reports the synthesis of formo-phenolic resins containing four catecholamide (CAM) moieties with admixture of phenol, catechol or resorcinol. These chelating resins have been developed to selectively extract U(VI) from seawater. This media is a challenging environment due to a pH around 8.2 and a large excess of alkaline and earth-alkaline cations. From the various sorption experiments investigated, the results indicate that the synthesized material exhibit good sorbent properties for U(VI) with uptake capacity about 50 mg/g for the more promising resins with a pronounced selectivity for uranium even under saline conditions. Thermodynamic and kinetic adsorption data were determined for the best resin (Langmuir adsorption model and pseudo-second order model).

Thiourea resole polymers for recovery of noble element

“…Chelating resins obtained by polycondensation reactions have received more attention due to the simplicity of the process and their high chemical and physical stabilities (Dzhardimalieva & Uflyand, 2018). Specifically, the formo-phenolic resins, which result from an alkaline polycondensation of aldehydes with a phenolic monomers incorporating chelating groups, have been proposed for the recovery of metal ions of interest (Arrambide et al, 2019;Arrambide Cruz et al, 2018;Bekkar et al, 2023;Mossand et al, 2023). Meeting these properties, thioureas, sulfur analogues of carbamides, are great chelating candidates for the sorption of precious metals (Ertan & Gülfen, 2009;Zuo & Muhammed, 1995).…”