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- W4386749246 abstract "The study of the Cr(VI) removal from model aqueous solutions was carried out on samples of polyaniline (PAn) and the glauconite/polyaniline (Gl/PAn) composite prepared by oxidation of aniline (An) with ammonium peroxydisulfate (APS) in the 0.5 M aqueous solutions of sulfuric acid (SA) in the absence or presence of finely dispersed glauconite, respectively.The molar ratio of An: APS during synthesis was 1 : 1.1, while the mass ratio of An : Gl = 1 : 1. The formation of PAn and the Gl/PAn composite was confirmed by X-ray phase, IR–FT spectral, and derivatographic analyzes and by the results of electrical conductivity measurements. The analysis of the spectral, thermal and electrical properties of the synthesized Gl/PAn composites showed their difference in relation to individual glauconite and polyaniline samples. The structure of polyaniline in the synthesized samples of Gl/PAn is amorphous with minor inclusions of PAn crystallites deposited on polydisperse particles of glauconite carrier-matrix. The values of specific electrical conductivity confirm that polyaniline in the samples of synthesized PAn and Gl/PAn composite is in the form of an emeraldine salt of SA. Thermal studies of the samples of Gl, PAn and the Gl/PAn composite showed that the composition of the composite coincides practically with the composition of the initial reaction mixture, i.e. the composite contains ~50 mass % of PAn. Synthesized samples have been studied with regard to the possibility of their use for Cr(VI) removal from model aqueous solutions at pollutant initial concentrations of 100, 200, 300, 400 and 500 mg/L. It was determined that the removal process takes place in two stages, namely fast initial and slow final, and it is caused mainly by the electrostatic interaction of anionic forms of Cr(VI) with the cationic adsorption centers of PAn. The results showed that the percentage of Cr(VI) removal is ~95–99 % and depends on the initial concentration of Cr(VI) in the solutions. Keywords : polyaniline, glauconite/polyaniline, composite, aqueous solutions, Cr(VI), removal." @default.
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- W4386749246 date "2023-01-01" @default.
- W4386749246 modified "2023-09-26" @default.
- W4386749246 title "Removal of Cr(VI) by polyaniline and glauconite/polyaniline-sulfatic acid composite" @default.
- W4386749246 doi "https://doi.org/10.30970/vch.6401.290" @default.
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