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Intraparticle diffusion of 1‐phenyl‐1, 2‐ethanediol in layered double hydroxides
Author(s) -
Liu Xiaolei,
Wei Min,
Li Feng,
Duan Xue
Publication year - 2007
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.11184
Subject(s) - thermal diffusivity , crystallite , diffusion , layered double hydroxides , adsorption , chemistry , homogeneous , fick's laws of diffusion , thermodynamics , chemical engineering , crystallography , physics , engineering
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 (D eff ) of PED in CMCD‐LDHs macroparticle were determined from the homogeneous Fickian diffusion model, increasing with the increase of PED bulk phase concentration (C 0 ), which indicates the existence of parallel diffusion (crystallites diffusion and pore diffusion). The crystallites diffusivity (D c ) and pore diffusivity (D p ) for the parallel diffusion model were determined from the intercept and slope of the plot of D eff (1+1/α) vs. 1/α, respectively. © 2007 American Institute of Chemical Engineers AIChE J, 2007