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<p>A new diallyl amine salt monomer (<b>I</b>) bearing Li<sup>+</sup> chelating 12-Crown-4 ether motifs [(H<sub>2</sub>C = CHCH<sub>2</sub>)<sub>2</sub>NH<sup>+</sup>CH<sub>2</sub>-(12-C-4) Cl<sup>−</sup>] was synthesized. Monomer (<b>I</b>) under free radical cyclopolymerization and alternate copolymerization with SO<sub>2</sub> afforded homo (<b>II</b>) and copolymer (<b>III</b>) in good yields. Terpolymerization of <b>I</b>, SO<sub>2</sub>, and a cross-linker tetraallylhexane-1,6-diammonium chloride <b>(IV)</b> gave cross-linked resin <b>V</b>, which has been utilized as a scavenger for lithium ions from aqueous samples via the liquid‒solid technique. Optimizing a method involves adjusting multiple variables, such as pH, Li<sup>+</sup> concentration, and resin dose, to achieve the best possible results. The adsorption capacity was determined using inductively coupled plasma-optical emission spectroscopy (ICP‒OES). The lithium removal study was conducted at concentrations ranging from 20 to 100 ppm. Resin <b>V</b> adsorbs lithium ions rapidly with excellent efficiency following second-order kinetics and fitting the Temkin and Langmuir adsorption isotherms. The resin demonstrated remarkable selectivity in adsorbing Li<sup>+</sup> from its binary mixtures Li<sup>+</sup>/Na<sup>+</sup> and Li<sup>+</sup>/K<sup>+</sup>.</p>

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Synthesis of a cross-linked polymer using a diallylammonium monomer containing 12-crown-4 motifs for the selective extraction of lithium ions

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  • 发表日期：

    2025年10月7日

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  • Khaled M. Ossoss,
  • Mohammad N. Siddiqui,
  • Shaikh A. Ali

摘要

A new diallyl amine salt monomer (I) bearing Li+ chelating 12-Crown-4 ether motifs [(H2C = CHCH2)2NH+CH2-(12-C-4) Cl−] was synthesized. Monomer (I) under free radical cyclopolymerization and alternate copolymerization with SO2 afforded homo (II) and copolymer (III) in good yields. Terpolymerization of I, SO2, and a cross-linker tetraallylhexane-1,6-diammonium chloride (IV) gave cross-linked resin V, which has been utilized as a scavenger for lithium ions from aqueous samples via the liquid‒solid technique. Optimizing a method involves adjusting multiple variables, such as pH, Li+ concentration, and resin dose, to achieve the best possible results. The adsorption capacity was determined using inductively coupled plasma-optical emission spectroscopy (ICP‒OES). The lithium removal study was conducted at concentrations ranging from 20 to 100 ppm. Resin V adsorbs lithium ions rapidly with excellent efficiency following second-order kinetics and fitting the Temkin and Langmuir adsorption isotherms. The resin demonstrated remarkable selectivity in adsorbing Li+ from its binary mixtures Li+/Na+ and Li+/K+.