A. A. Geidarov, N. I. Abbasova, Z. A. Dzhabbarova, A. A. Ibragimova, G. I. Alyshanly
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Abstract
The factors affecting iron(III) adsorption by strongly acidic Dowex G-26(H) cation-exchange resin are studied. These factors include the adsorbent dose, pH of the solution, contact time, initial Fe(III) concentration in the solution, and temperature. Langmuir and Freundlich adsorption isotherms are constructed from the experimental results. Both isotherms quite satisfactorily describe Fe(III) adsorption by the Dowex G-26(H) adsorbent, which is indicated by high (close to unity) coefficients of determination (R2). The calculated capacity of the adsorbent ranges from 166.6 to 196.1 mg g–1 at different temperatures (T = 293–313 K). The kinetic and thermodynamic parameters of the process (ΔH°, ΔS°, ΔG°) have been determined. The positive calculated standard entropy (ΔS°) and enthalpy (ΔH°) changes suggest that the adsorption of Fe(III) ions on the resin is endothermic and spontaneous.
期刊介绍：
Russian Metallurgy (Metally) publishes results of original experimental and theoretical research in the form of reviews and regular articles devoted to topical problems of metallurgy, physical metallurgy, and treatment of ferrous, nonferrous, rare, and other metals and alloys, intermetallic compounds, and metallic composite materials. The journal focuses on physicochemical properties of metallurgical materials (ores, slags, matters, and melts of metals and alloys); physicochemical processes (thermodynamics and kinetics of pyrometallurgical, hydrometallurgical, electrochemical, and other processes); theoretical metallurgy; metal forming; thermoplastic and thermochemical treatment; computation and experimental determination of phase diagrams and thermokinetic diagrams; mechanisms and kinetics of phase transitions in metallic materials; relations between the chemical composition, phase and structural states of materials and their physicochemical and service properties; interaction between metallic materials and external media; and effects of radiation on these materials.
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