Investigation of the adsorption of Ni(II) ions by Acacia auriculiformis bark modified with acid solutions
Abstract
Acacia auriculiformis bark modified with weakly concentrated (1-3%) solutions of nitric and phosphoric acids has been studied as a biosorbent for the removal of Ni2+ ions under static conditions. The results of the study show that the isotherms of adsorption Ni2+ ions on samples of native and acid-modified bark of Acacia auriculiformis belong to type I isotherms, according to the IUPAC classification, and L-type, according to the Giles classification. The maximum sorption capacity of the native bark of Acacia auriculiformis for Ni2+ ions is 9,0 mg/g. It was found that with an increase in the concentration of mineral acid solutions, the sorption capacity of modified Acacia auriculiformis bark samples for Ni2+ ions increases. The obtained adsorption isotherms were processed within the framework of the Langmuir, Freindlich, Dubinin-Radushkevich and Temkin models. It has been determined that the adsorption isotherms are most adequately described by the Langmuir model. It is shown that the pseudo-second order kinetic equation is in good agreement with the experimental data. The results of calculations of thermodynamic parameters (ΔH0, ΔS0, and ΔG0) testify to the spontaneous and endothermic nature of the adsorption process. Considering the dependency of the kinetic parameters in the framework of the Boyd diffusion model, the coefficients of external and internal diffusion were calculated, as well as the Biot criterion, the values of which for all the studied processes indicate that the limiting stage of the process is mixed diffusion.
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