title: The role of external and internal mass transfer in the process of Cu2+ removal by natural mineral sorbents.
abstract: The kinetics of Cu2+ 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 Cu2+ 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 x 10(-11) to 1.0 x 10(-13) m2/min, depending on the Cu2+ concentration and the applied theoretical model.
authors: Vinca Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522,11001 Belgrade, Serbia. marijasljivic@vinca.rs
authors: M
authors: M
authors: Sljivić
authors: I
authors: I
authors: Smiciklas
authors: I
authors: I
authors: Plećas
authors: S
authors: S
authors: Pejanović
mesh_terms: D000042:Absorption; D003198:Computer Simulation; D003300:Copper / Q000737:chemistry* / Q000302:isolation & purification*; D004058:Diffusion; D007700:Kinetics; D008903:Minerals / Q000737:chemistry*; D008956:Models, Chemical; D010316:Particle Size
chemical_list: D008903:Minerals; D003300:Copper