In the modern society, the problem of the treatment of natural and wastewater resources and their management, is becoming very important. Of particular interest is the definition of adequate and sophisticated procedures for the treatment of natural and wastewater resources, regardless of whether the source of pollution is of geogenic or anthropogenic origin. Sustainable development of separation processes has recently been increasingly imposed by the need to develop modern, non-conventional bioseparation processes for the elimination of toxic metals from wastewater, by applying low cost unconventional sorbents. The purpose of this paper is to remove Mn (II) ions from aqueous solutions by applying a natural adsorbent (grape branches - agricultural waste). To accomplish the established goal, the experiments were carried out with model solutions with known initial concentrations of Mn(II) ions in a laboratory batch reactor, with the purpose of studying the effect of adsorption time on adsorbate concentration and on the adsorbed amount of Mn(II) ions. The raw material was characterized in terms of its chemical composition and particle size distribution. The obtained results were applied to model the adsorption equilibrium using several adsorption isotherms such as Langmuir, Freundlich, Langmuir-Freundlich and Redlich-Peterson, using the MATLAB/Curve fitting toolbox software package.
Adsorption of arsenites and arsenates from aqueous solutions by application of modified natural inorganic materials-a kinetic study Two commercially available adsorbents, white tuff from Strmos region and a material with a commercial name Zeofit obtained from Palanka region, were investigated as possible raw materials for adsorption of arsenites and arsenates from aqueous solutions. These raw materials were modified through chemical insertion of iron within the basic material structure and ionic substitution of calcium and magnesium ions with sodium ions in order to improve the sorptive and ion-exchange properties of studied raw materials. Obtained results from the experimental study of the adsorption of arsenic ions from simulated aqueous solutions suggest that the Zeofit material produced better results than the white tuff material, which showed satisfactory adsorption efficiency only at lower arsenic ions concentrations. Drinking water from the water supply system in Skopje was used for preparation of the studied arsenic ions solutions. Performed kinetic study and resulting kinetic models for both materials, generated a kinetic model of first order for the white tuff material, whereas the Zeofit material adsorption kinetics indicated a pseudosecond order.
Two raw materials were investigated to provide a cheap and effi cient arsenic removal from drinking water supply. For this purpose, studied materials were modifi ed by insertion of iron within the materials' structure and substitution of calcium and magnesium ions with sodium ions in order to improve the sorptive and ion-exchange properties. White tuff from Strmos region and the commercially available Zeofi t were the materials considered within our study. Simulations were performed on prepared solutions of arsenic added to water samples from the water supply in Skopje. Obtained results suggest that the Zeofi t material produced better results regarding arsenic adsorption at various initial arsenic concentrations. The white tuff from Strmos is effective only at lower initial concentrations of arsenic. Regarding the equilibrium study on investigated systems for both materials, implemented models produced a good fi t when applied to As 5+ systems. The Strmos material did not produce satisfactory fi tting results to implemented equilibrium models for the As 3+ systems.
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