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The biosorption process of three divalent metal ions -nickel, lead and zinc-from on calcium alginate from aqueous solution was studied, in single component systems. The biosorbent were investigated by Fourier Transform Infrared Spectroscopy. The batch mode experiments of the adsorption process were carried out as a function of pH, initial metal ions concentration, sorbent dosage and contact time. The adsorption infl uencing parameters for the maximum removal of metal ions were optimized. The experimental data were analyzed using the Langmuir, Freundlich, Langmuir-Freundlich, Koble-Corrigan and Redlich-Peterson models. The kinetic data of biosorption process were evaluated using pseudo-fi rst and pseudo-second order equations. The Weber and Morris model was employed to interpret the metal ions diffusion in biosorption process.

This work reports adsorption isotherms of water, propan-2-ol, and methylbenzene vapors on three commercial adsorbents: grade 03 silica gel, Sorbonorit 4 activated carbon, and HiSiv 3000 zeolite. The adsorption isotherms were measured at (293.15, 313.15, 333.15, 348.15, 373.15, 393.15, and 413.15) K and pressures up to 2340 Pa for water, 4460 Pa for propan-2-ol, and 2910 Pa for methylbenzene. Additionally measurements for the water vapor−Sorbonorit 4 system at (293.15, 303.15, 313.15, and 323.15) K and relative humidity up to 95% (at 323.15 K up to 70%) were made because of different type of adsorption isotherm. The measurements were carried out by intelligent gravimetric analyzer. The data obtained from measurements were correlated with selected multitemperature adsorption isotherms equations: Toth, Langmuir−Freundlich, and Dubinin−Astakhov.

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