A Composite Containing CR (III) Compounds and its Application to the Selective Sorption of Phosphate Ions
Keywords:
Composite, Selective Sorption, Phosphate, Isotherm, OptimizingAbstract
The novelty of this research consist in the synthesis of metal compounds in the phase of polymers that do not contain in their matrix negatively charged or electron donors atoms and, theoretically, cannot interact with metal cations. The composite has property to selective sorption of phosphate from solutions. There was investigated the phosphate sorption by the obtainind composite, containing polymer and ultra fine particles of chromium (III) compounds, (AV-17(Cr), and by the commercial AV-17(Cl) polymer. Sorption on these sorbents, caused by ions and ligands exchange, can be used not only for water purification, but and for modeling of the processes occurring in soil at using of phosphorus fertilizers as well. Also it was investigated the sorption dependence on the solution pH and kinetics at 16 and 60 °C on AV-17(Cr) and at 20 and 54 °C on AV-17(Cl). The kinetics mechanism, which controls the sorption process is speudo-second order model. It was determined the rate limiting step of sorption, depending on the sorbent nature and temperature. Isotherms were calculated with Langmuir, Freundlich, Sips, Dubinin-Radushkevich (AV-17(Cl) and BET (AV-17(Cr)) sorption models. To evaluate the influence of different factors (concentration of Na3PO4, KCl, NaNO3 and Na2SO4, pH and temperature of solution, duration of the AV-17(Cr) contacting with solution) on phosphate sorption, the methods statistical mathematics (G.E.P.Box and K.B.Wilson) were used. Sorption optimizing was performed by the moving on the gradient method. Mathematical modeling and optimization allowed us not only a considerable increase in phosphate sorption (up to 102 mg P/g) on composite AV-17(Cr), but and show that sorption is a chemical selective process. Moreover, the conclusion is confirmed and by the studies carried out using the FTIR spectroscopy. Estimating the size and morphology of ultrafine particles of chromium (III) compounds in the phase of composite AV-17(Cr) were performed using the SEM.
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