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Equilibrium modeling of mono and binary sorption of Cu(II) and Zn(II) onto chitosan gel beads

Nastaj J., Tuligłowicz M., Witkiewicz K.

Chemical and Process Engineering

2016

Vol. 37, nr 4

485--501

The objective of the work are in-depth experimental studies of Cu(II) and Zn(II) ion removal on chitosan gel beads from both one- and two-component water solutions at the temperature of 303 K. The optimal process conditions such as: pH value, dose of sorbent and contact time were determined. Based on the optimal process conditions, equilibrium and kinetic studies were carried out. The maximum sorption capacities equaled: 191.25 mg/g and 142.88 mg/g for Cu(II) and Zn(II) ions respectively, when the sorbent dose was 10 g/L and the pH of a solution was 5.0 for both heavy metal ions. One-component sorption equilibrium data were successfully presented for six of the most useful three-parameter equilibrium models: Langmuir-Freundlich, Redlich-Peterson, Sips, Koble-Corrigan, Hill and Toth. Extended forms of Langmuir-Freundlich, Koble-Corrigan and Sips models were also well fitted to the two-component equilibrium data obtained for different ratios of concentrations of Cu(II) and Zn(II) ions (1:1, 1:2, 2:1). Experimental sorption data were described by two kinetic models of the pseudo-first and pseudo-second order. Furthermore, an attempt to explain the mechanisms of the divalent metal ion sorption process on chitosan gel beads was undertaken.

Description of experimental data in thermodynamics analysis of binary solutions.

Jarosz P., Sukiennik M., Gargul K., Gierlotka W.

Inżynieria Materiałowa

2001

R. XXII, nr 4

392-393

In this work one analysed influence of manner of description of experimental data on counted values of thermodynamical function in binary solution. One ascertained, that large meanings in widened thermodynamical analysis of binary solutions has acquaintance of structural coefficients. It is possible to obtain the reliable results from phase diagram only using interpolation methods. One showed on the ground of thermodynamical analysis of solution Hg-In, that description of activity with functions cubic spline permits on qualification stochiometrics of intermetallic compounds.