Intraparticle diffusion of 1-phenyl-1, 2-ethanediol in layered double hydroxides

Authors

  • Xiaolei Liu,

    1. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, P.R. China
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  • Min Wei,

    1. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, P.R. China
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  • Feng Li,

    1. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, P.R. China
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  • Xue Duan

    Corresponding author
    1. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, P.R. China
    • State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, P.R. China
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Abstract

The enantioselective adsorption of racemic 1-phenyl-1,2-ethanediol (PED) by carboxymethyl-β-cyclodextrin-intercalated Zn–Al- layered double hydroxides (CMCD-LDHs) has been studied. The adsorption isotherms of enantioselective as well as nonenantioselective adsorption of PED by CMCD-LDHs have been investigated, and it was found that the Langmuir–Frendlich and Frendlich model can be respectively used to describe the two different adsorptions satisfactorily. Furthermore, the intraparticle diffusion model is successfully validated in this work. Intraparticle effective diffusivities (Deff) of PED in CMCD-LDHs macroparticle were determined from the homogeneous Fickian diffusion model, increasing with the increase of PED bulk phase concentration (C0), which indicates the existence of parallel diffusion (crystallites diffusion and pore diffusion). The crystallites diffusivity (Dc) and pore diffusivity (Dp) for the parallel diffusion model were determined from the intercept and slope of the plot of Deff(1+1/α) vs. 1/α, respectively. © 2007 American Institute of Chemical Engineers AIChE J, 2007

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