Highly efficient enrichment and adsorption of rare earth ions (yttrium(III)) by recyclable magnetic nitrogen functionalized mesoporous expanded perlite

• Published in: Chinese chemical letters Vol. 31; no. 10; pp. 2849 - 2853
• Main Authors: Liu, Juan, Zeng, Liqiang, Liao, Su, Liao, Xiaofeng, Liu, Jun, Mao, Jinshui, Chen, Yunnen, Qiu, Tingsheng, Ren, Sili
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-10-2020; Jiangxi Key Laboratory of Mining Engineering, School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China; School of Chemical Engineering and Materials, Changzhou Institute of Technology, Changzhou 213000, China%Jiangxi Key Laboratory of Mining Engineering, School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
• Subjects: Adsorption; Enrichment; Magnetic mesoporous expanded perlite; Rare earth ions; Yttrium(III) ions; Enrichment; Yttrium(III) ions; Magnetic mesoporous expanded perlite; Adsorption; Rare earth ions; Yttrium(Ⅲ) ions
• ISSN: 1001-8417; 1878-5964
• DOI: 10.1016/j.cclet.2020.08.017

A magnetic mesoporous expanded perlite-based (EPd-APTES@Fe3O4) composite was designed and synthesized as a novel adsorbent for enrichment of yttrium(III) ions with the maximum adsorption capacity of 383.2 mg/g. FTIR, XPS and the quantum chemical calculation indicated that the yttrium(III) ions were captured on the EPd-APTES@Fe3O4 surface mainly by coordination with functional group of -NH2.
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A magnetic mesoporous expanded perlite-based (EPd-APTES@Fe3O4) composite was designed and synthesized as a novel adsorbent for enrichment of rare earth ions in aqueous solution. Effect of various factors including the pH of solution, contact time and adsorbent dosage on the adsorption behaviors of yttrium(III) by the EPd-APTES@Fe3O4 nano-material composites from aqueous solution was investigated. The maximum adsorption capacity of the as-prepared materials for yttrium(III) ions was 383.2 mg/g. Among the various isotherm models, the Freundlich isotherm model could well described for the adsorption of the rare earth ions at pH 5.5 and 298.15 K. The kinetic analysis indicated that the adsorption process followed the pseudo-second order kinetics model, and the rate-determining step might be chemical adsorption. Thermodynamic parameters declared that the adsorption process was endothermic. In addition, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and the quantum chemical calculation indicated that the yttrium(III) ions were captured on the EPd-APTES@Fe3O4 surface mainly by coordination with functional group of -NH2. More importantly, the adsorption-desorption studies indicated that the EPd-APTES@Fe3O4 nano-material composites had a high stability and good recyclability.