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Pore diffusion: Dependence of the effective diffusivity on the initial sorbate concentration in single and multisolute batch adsorption systems
Author(s) -
AlDuri Bushra,
McKay Gordon
Publication year - 1992
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.280550308
Subject(s) - thermal diffusivity , thermodynamics , diffusion , adsorption , mass transfer , ternary operation , chemistry , mass diffusivity , work (physics) , diffuser (optics) , ternary numeral system , chromatography , organic chemistry , physics , optics , light source , computer science , programming language , phase (matter)
The present work studies the intraparticle diffusivity in batch adsorption systems as a function of the initial sorbate concentration. The systems under investigation are basic dyes, namely Basic Blue 69, Basic Red 22 and Basic Yellow 21 and their binary and ternary combinations, all adsorbing onto activated carbon Filtrasorb 400. They study is based on the film‐pore diffusion model and the output is a combination of the external mass transfer coefficient, k f and the effective diffusivity, D eff that yields congruent experimental and theoretical kinetic data. It has been found the D eff varies with C o in an exponential decay function. Furthermore. D eff values undergo a general reduction in the multisolute systems compared to the single component systems. Also, the relative diffusion rates in the multisolute systems are found to change such that D eff of the slower diffuser is enhanced and that D eff of the faster diffuser is inhibited.