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Extraction of Rb(I) Ions from Aqueous Solution Using Novel Imprinting Materials
journal contribution
posted on 2019-03-13, 00:00 authored by Xingwen Liu, Qi Wang, Zhuo Wang, Xueting Liu, Minghui Zhang, Jiahui Fan, Zhiyong Zhou, Zhongqi RenA new
type of Rb(I) ion imprinting material was prepared with methacrylic
acid as functional monomer, Rb(I) ion as template, and methanol/acetonitrile
as solvent. The polymerization reaction was initiated by N,N-azobis(isobutyronitrile) (AIBN) with
the cross-linking by ethylene glycol dimethacrylate (EGDMA). In addition,
benzo-12-crown-4-ether (B12C4) was introduced as a ligand to fix the
template ions better. Scanning electron microscope, Zeta potential
analysis, Fourier transform infrared spectrum, thermogravimetric analysis,
and energy dispersive spectra were used for characterization of the
imprinted polymer. Effects of preparation and adsorption conditions
on adsorption performances of Rb(I) ion-imprinted polymers (IIPs)
were investigated. The imprinted polymer had fast adsorption kinetics
(reaching equilibrium within 15 min) and high maximum adsorption capacity
(129.9 mg·g–1) at pH 9.5. Besides, the adsorption
process conformed to pseudo-second-order kinetic and Freundlich isotherm
models. Moreover, the prepared Rb(I)-IIPs showed high selectivity
for Rb(I) ions. The results of eight repeated cycles of adsorption–desorption
demonstrated that the prepared Rb(I)-IIPs had good stability and reusability.
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thermogravimetric analysisRbScanning electron microscope15 minadsorption conditionsmethacrylic acidB 12CpH 9.5.polymerization reactiontemplate ionsAqueous Solutionenergy dispersive spectraadsorption kineticsethylene glycol dimethacrylateadsorption processadsorption performancesFreundlich isotherm modelsAIBNIIPbenzo -12-crownNovel Imprinting MaterialsEGDMA
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