Sorption of dyes from aqueous solutions onto fly ash |
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Authors: | Janos Pavel Buchtová Hana Rýznarová Milena |
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Affiliation: | Faculty of Environmental Studies, University of Jan Evangelista Purkyne, Králova Vysina 7, 400 96 Ustí nad Labem, Czech Republic. janos@fzp.ujep.cz |
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Abstract: | Brown coal fly ashes were tested as potentially low-cost sorbents for the removal of synthetic dyes from waters. It was shown that both basic (cationic) as well as acid (anionic) dyes can be sorbed onto the fly ash. The adsorption can be described by the multi-site Langmuir isotherm. The sorption capacities were in the range of 10−1–10−3 mmol/g and did not differ significantly for basic and acid dyes. The dye sorption decreased in the presence of organic solvents (methanol, acetone). The presence of oppositely charged surfactants exhibited a pronounced effect on the dye sorption—low concentrations of the surfactant enhanced sorption, whereas high concentrations solubilized the dyes and kept them in solution. Inorganic salts exhibited only a minor effect on the dye sorption. The sorption of basic dyes increased at high pH values, whereas the opposite was true for acid dyes. |
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Keywords: | Acid dyes Basic dyes Sorption Fly ash Wastewater treatment |
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