The recovery of rhenium from waste acid is an urgent issue due to low rhenium concentration and high sulfuric acidity.To solve the problem,novel coated solvent-impregnated resins consisting of inert resins LS-300,Alam...The recovery of rhenium from waste acid is an urgent issue due to low rhenium concentration and high sulfuric acidity.To solve the problem,novel coated solvent-impregnated resins consisting of inert resins LS-300,Alamine 304-1 and the PVA film(304-CSIRs)were prepared for the separation of Re(Ⅶ)from high sulfuric acid solutions.It was shown that the PVA film coated completely on the surfaces of LS-300 resins with a thickness of 5μm,and Alamine 304-1 distributed completely inside the porous of LS-300 resins.The adsorption fitted well with Langmuir model and pseudo-second-order model with the saturation adsorption capacity of139.40 mg·g-1.The maximum separation factor of Re(Ⅶ)versus Cu(Ⅱ)was up to 483,and 304-CSIRs had no adsorptions for As(V).The adsorption capacity of Re(Ⅶ)onto 304-CSIRs maintained in 97.79%at the fifth adsorption-desorption cycle.99.87%of rhenium was recovered by 304-CSIRs from waste acid generated from a copper smelter.展开更多
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 spectrosc...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, pH_(equilibrium)–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 pH_(equilibrium)–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: Lu>Yb>Tm>Er>Ho. The adjacent heavy rare earth(RE) separation factors β_(Lu/Yb),β_(Yb/Tm), β_(Tm/Er), and β_(Er/Ho)were 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 >Lu>Tm>Zn>Mg>Ca>Ho>Co>Ni>Cu>Al.展开更多
基金financially supported by the Fundamental Research Funds for the Central Universities of Central South University(No.2019zzts243)the National Natural Science Foundation of China(No.51604303)Hunan Natural Science Fund for Distinguished Young Scholar(No.2019JJ20031)。
文摘The recovery of rhenium from waste acid is an urgent issue due to low rhenium concentration and high sulfuric acidity.To solve the problem,novel coated solvent-impregnated resins consisting of inert resins LS-300,Alamine 304-1 and the PVA film(304-CSIRs)were prepared for the separation of Re(Ⅶ)from high sulfuric acid solutions.It was shown that the PVA film coated completely on the surfaces of LS-300 resins with a thickness of 5μm,and Alamine 304-1 distributed completely inside the porous of LS-300 resins.The adsorption fitted well with Langmuir model and pseudo-second-order model with the saturation adsorption capacity of139.40 mg·g-1.The maximum separation factor of Re(Ⅶ)versus Cu(Ⅱ)was up to 483,and 304-CSIRs had no adsorptions for As(V).The adsorption capacity of Re(Ⅶ)onto 304-CSIRs maintained in 97.79%at the fifth adsorption-desorption cycle.99.87%of rhenium was recovered by 304-CSIRs from waste acid generated from a copper smelter.
基金financially supported by the National Natural Science Foundation of China(Nos.51974026 and 21301104)the National Key R&D Program of China(No.2018YFC1900604)the Fundamental Research Funds for the Central Universities(No.FRF-TP-16019A3)。
文摘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, pH_(equilibrium)–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 pH_(equilibrium)–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: Lu>Yb>Tm>Er>Ho. The adjacent heavy rare earth(RE) separation factors β_(Lu/Yb),β_(Yb/Tm), β_(Tm/Er), and β_(Er/Ho)were 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 >Lu>Tm>Zn>Mg>Ca>Ho>Co>Ni>Cu>Al.
