Abstract
Samples of the composites are a natural mineral/polyaniline prepared by oxidative polycondensation of aniline with ammonium peroxide disulfate in aqueous 0.5 M sulfuric acid solutions in the presence of powdered natural minerals, namely kaolin, glauconite and zeolite. In the absence of natural minerals, polyaniline was prepared by the same method. Kaolin, glauconite and zeolite of Ukrainian origin were used as natural minerals. The molar ratio of aniline to ammonium peroxodisulfate was 1:1.1, and the mass ratio of natural mineral: aniline was 1:1. The formation and properties of the composites are natural mineral/polyaniline confirmed and investigated by X-ray, FTIR spectral analysis and power analysis. The synthesized composite samples of natural mineral/polyaniline have been shown to have different properties from the properties of pure natural minerals and polyaniline. The structure of polyaniline in the synthesized samples of polyaniline and composites is amorphous with minor inclusions of crystallites of polyaniline in the form of the emeraldine salt of sulfuric acid deposited on dispersed crystalline particles of kaolin, glauconite and zeolite as matrixes. Comparative studies of the sorption properties of the formed composites with the sample of polyaniline were carried out and the possibility of their use for the sorption of Cr(VI) from aqueous solutions was established. The absorption properties of both polyaniline and natural mineral/polyaniline composites in which polyaniline is sulfuric acid supplemented during synthesis are high during the first hour of adsorption onset. By mass ratio, the natural mineral: polyaniline 1:1 complete removal of Cr(VI) from aqueous solutions occurs over a long time. The studied composites can be effective sorbents of Cr(VI) ions. Keywords: polyaniline, natural mineral/polyaniline composites, properties, Cr(VI) adsorption.
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