INVESTIGATION OF THE REACTIVITY OF THE SURFACE OF A CARBON-CONTAINING SILICATE SORBENT OF PLANT ORIGIN
Abstract
In this paper, a new effective sorbent obtained by heat treatment of rice husk is studied. The results of the elemental (EDX) analysis of the sorbent sample are presented. In order to explain and predict the chemical behavior of the sorbent and its reactivity with respect to heavy metal ions, the functional composition of this sorbent was studied by potentiometric titration and IR spectroscopy. Based on the conducted researches, it was established that the resulting sorbent is a heterofunctional polyelectrolyte containing acid centers of various types. It contains sorption-active groups remaining from the original husk, as well as those belonging to coal and silica. On the surface of the sorbent, carboxyl groups, alcohol and phenolic hydroxyls, silanol and other functional groups are found, which act as active centers of sorption. These centers of sorption can be located in the sorbent in the form of reactive fragments of partially decomposed organic compounds: cellulose, hemicellulose and lignin. In addition, in the composition of the sorbent sample under study it was found a significant amount of silicon dioxide, which exhibits chemical activity with respect to polar and ionic compounds. The functional groups of the sorbent detected as a result of processing the pK spectrum, in general, correlate with the results of IR spectroscopy. The total acidity of the sorbent was determined. As part of this work, its sorption properties with respect to copper (II) and zinc (II) ions were studied. It was established that during the sorption of metal ions by this sorbent, the pH of the aqueous solution decreases, which indicates the ion-exchange nature of sorption. It was found that the change in the acidity of the medium during sorption depends on the initial concentration of metal ions in the solution.
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