Sorption of certain lanthanides by kieselguhr loaded with Cyanex 572 from sulfate medium
来源期刊：JOURNAL OF RARE EARTHS2020年第3期
论文作者：Sh.Sh.Emam M.S.Gasser N.E.El-Hefny W.H.Mahmoud H.F.Aly
文章页码：299 - 305
摘 要：Kieselguhr for chromatography was loaded with Cyanex 572 extractant and characterized using X-ray diffraction（XRF）,scanning electron microscopy（SEM）,Fourier transform infra-red（FT-IR）,and thermal analysis.Sorption of some heavy lanthanides together with yttrium by the prepared kieselguhr/Cy-572 sorbent was investigated by batch experiment in terms of initial metal ions concentrations,volume to solid mass ratio（V/m）,sulfuric acid concentration as well as temperature.The sorption equilibrium of Cy-572 loaded kieselguhr was satisfactorily explained by the pseudo second-order kinetic model and Langmuir isotherm data.Furthermore,the values of thermodynamic parameters △G°,△H°,and △S°at25℃of the studied metal ions show that the process is spontaneous and endothermic in nature.2.0 mol/L HNO3 is promising to desorb these metal ions.
Sh.Sh.Emam1，M.S.Gasser1，N.E.El-Hefny1，W.H.Mahmoud2，H.F.Aly1
1. Hot Laboratories Centre,Atomic Energy Authority2. Department of Chemistry,Faculty of Science,Ain Shams University
摘 要：Kieselguhr for chromatography was loaded with Cyanex 572 extractant and characterized using X-ray diffraction（XRF）,scanning electron microscopy（SEM）,Fourier transform infra-red（FT-IR）,and thermal analysis.Sorption of some heavy lanthanides together with yttrium by the prepared kieselguhr/Cy-572 sorbent was investigated by batch experiment in terms of initial metal ions concentrations,volume to solid mass ratio（V/m）,sulfuric acid concentration as well as temperature.The sorption equilibrium of Cy-572 loaded kieselguhr was satisfactorily explained by the pseudo second-order kinetic model and Langmuir isotherm data.Furthermore,the values of thermodynamic parameters △G°,△H°,and △S°at25℃of the studied metal ions show that the process is spontaneous and endothermic in nature.2.0 mol/L HNO3 is promising to desorb these metal ions.
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