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Intraparticle diffusion of cadmium and zinc ions during adsorption from aqueous solution on activated carbon
Author(s) -
LeyvaRamos R,
RangelMendez JR,
BernalJacome LA,
Berber Mendoza MS
Publication year - 2005
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.1263
Subject(s) - adsorption , activated carbon , cadmium , chemistry , zinc , thermal diffusivity , diffusion , aqueous solution , ionic strength , mass transfer , inorganic chemistry , chemical engineering , chromatography , thermodynamics , organic chemistry , physics , engineering
The adsorption isotherms of cadmium(II) and zinc(II) onto activated carbons were obtained in a batch adsorber. The concentration decay data were obtained in a rotating basket adsorber and were interpreted by a mathematical model, which takes into account the adsorption rate, external mass transport and intraparticle diffusion. The results showed that the overall rate of adsorption of Cd(II) and Zn(II) was mainly controlled by the intraparticle diffusion which was solely due to pore volume diffusion. The contribution of the external mass transport resistance was negligible. The effective pore volume diffusivities of Cd(II) and Zn(II) were predicted reasonably well using the ionic diffusivity of the metal and the void fraction and tortuosity of activated carbon. Copyright © 2005 Society of Chemical Industry