Equilibrium and kinetic studies of sorption of Fe(III) ions on R-modified sorbent with CSMA
Abstract
The sorbent was obtained based on a copolymer of styrene with maleic anhydride and 2-nitro-4- sulphoaniline (S) and subsequently modified with the reagent 4,4'-(ethane-1,2-diylbis(azanilidene))bis(pentan- 2-one) (S1). The sorption of the resulting product with respect to Fe(III) ions was studied. During the study, the influence of various factors on adsorption was studied, such as: pH, contact time, ionic strength, initial concentration of the metal ion, etc. The results were characterized using various adsorption isotherm and kinetic models. The results of the research showed that sorption is best described by the Langmuir model and the pseudo-second order kinetic model. The maximum sorption capacity was 348 mg/g for S and 479.2 mg/g for S1. For the adsorption studies, solutions of 5∙10-3 mol/dm3 Fe(III) were used. Static sorption studies were carried out at room temperature. For the desorption studies, acids of various concentrations were used, in particular solutions of 0.5 mol/dm3 HNO3, HCl, H2SO4 and HClO4.
Studies have shown that the modification of the adsorbent with a reagent led to an increase in sorption capacity, which means that the efficiency of extraction of Fe(III) ions by the corresponding product also increased. Thus, we can continue research in this area and modify the adsorbent with other reagents. A comparison of maximum adsorption capacities qmax of various adsorbents for the removal of Fe(III) ions showed that the adsorbents used in this study have higher sorption abilities. The resulting products were used for the sorption-photometric de- termination of Fe(III) in apricot and provided positive results. These factors suggest that the synthesized prod- ucts can be considered as being effective materials for the extraction of Fe(III) ions.
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References
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