The role of external and internal mass transfer in the process of Cu2+ removal by natural mineral sorbents

The kinetics of Cu 2+ sorption on to zeolite, clay and diatomite was investigated as a function of initial metal concentrations. For consideration of the mass transfer phenomena, single resistance models based on both film and intraparticle diffusion were tested and compared. The obtained results su...

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Bibliographic Details
Published in:Environmental technology 2011-07, Vol.32 (9), p.933-943
Main Authors: SLJIVIC, M, SMICIKLAS, I, PLECAS, I, PEJANOVIC, S
Format: Article
Language:English
Subjects:
Absorption
Applied sciences
Chemical engineering
clay
Clay minerals
Computer Simulation
Copper - chemistry
Copper - isolation & purification
diatomite
Diffusion
Exact sciences and technology
Heat and mass transfer. Packings, plates
Kinetics
Mass transfer
Mathematical models
Minerals - chemistry
Models, Chemical
Particle Size
Pollution
Sorbents
Sorption
zeolite
Zeolites
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Summary:The kinetics of Cu 2+ sorption on to zeolite, clay and diatomite was investigated as a function of initial metal concentrations. For consideration of the mass transfer phenomena, single resistance models based on both film and intraparticle diffusion were tested and compared. The obtained results suggested that the rate-limiting step in Cu 2+ sorption strongly depended on the sorbent type, as well as on initial cation concentration. The decrease in external mass transfer coefficients with the increase in initial metal concentrations was in excellent agreement with expressions based on Sherwood and Schmidt dimensionless numbers. The internal diffusivities through zeolite particles were in the range 1.0 × 10 −11 to 1.0 × 10 −13 m 2 /min, depending on the Cu 2+ concentration and the applied theoretical model.
ISSN:0959-3330
1479-487X
DOI:10.1080/09593330.2010.521952