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

作者：Juan Liu; Liqiang Zeng; Su Liao; Xiaofeng Liao; Jun Liu; Jinshui Mao; Yunnen Chen; Tingsheng Qiu; Sili Ren^*

来源：Chinese Chemical Letters, 2020, 31(10): 2849-2853.

A magnetic mesoporous expanded perlite-based(EPd-APTES@Fe3 O4) 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@Fe3 O4 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 ea rth 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@Fe3 O4 surface mainly by coordination with functional group of-NH2.More importantly,the adsorption-desorption studies indicated that the EPd-APTES@Fe3 O4 nano-material composites had a high stability and good recyclability.