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Sorption kinetics of Cd(II) ions on fermented grape marc

Grudić V., Bošković I., Jaćimović Z.

Environment Protection Engineering

2017

Vol. 43, nr 4

243--252

The sorption kinetics of Cd(II) ions on the biosorbent which is waste in wine production has been investigated. The sorption process took place relatively quickly, enabling one to achieve equilibrium within a period of 15–20 min only, depending on initial concentration of the sorbate. Kinetic models of pseudo-first and pseudo-second order, model of diffusion in a fluid film and Weber’s and Morris’ intraparticle diffusion model were used to describe the experimental results. The pseudo-second order kinetic model described the sorption process with a high correlation coefficient (R2 = 0.998) better than the other kinetic models. The mass transfer coefficient decreases upon increasing the initial concentration of the solution, which can be explained by the fact that the mechanism of binding of Cd(II) ions to the surface of the sorbent is ion exchange followed by discharge of exchangeable cations from the surface. Characteristic constants in the Weber–Morris model increase upon increasing the initial concentration of the solution.