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Solid-phase extraction and separation of heavy rare earths from chloride media using P227-impregnated resins

Bin Yang  Suo-Zhi Wu  Xin-Yu Liu  Zeng-Xin Yan  Yu-Xue Liu  Qi-Song Li  Feng-Shan Yu  Jun-Lian Wang  
【摘要】:A solid-phase extraction resin SIRs-P227/XAD-7 HP was prepared by impregnating extractant P227 onto macroporous resin XAD-7 HP beads. SIRs-P227/XAD-7 HP beads were characterized by Fourier transform infrared spectroscopy(FTIR) and scanning electron microscopy(SEM) equipped with energy-dispersive spectroscopy(EDS). The adsorption kinetics, particle size effect,adsorption isotherm, pHequilibrium–lg D relationship(where D is distribution coefficient), desorption, adsorption selectivity for heavy rare earths, and impurity ions were studied. The results showed that the adsorption kinetics of Lu(III) on the SIRs-P227/XAD-7 HP beads fitted the Morris–Weber model best. The adsorbance decreased as the particle size increased. The pHequilibrium–lg D relationship fitted well with a straight line, and the slope was 1.56. The experimental data fitted well with Langmuir adsorption.The calculated maximum adsorption capacity was23.8 mg·g~(-1), while the experimental datum was22.7 mg·g~(-1) at the given conditions. The adsorbed Lu(III)can be easily stripped by 0.1 mol·L~(-1) HCl. The adsorption selectivity of SIRs-P227/XAD-7 HP for heavy REs exhibited the following order: LuYbTmErHo. The adjacent heavy rare earth(RE) separation factors bLu/Yb,bYb/Tm, bTm/Er, and bEr/Howere 1.57, 3.00, 3.03, and 2.23,respectively, at liquid/solid ratio(L/S) equal to 3:20. The adsorption selectivity for impurity ions exhibited the followingorder:Fe LuTmZnMgCaHoCoNiCuAl.

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