Adsorption of organic anions from aqueous solutions by layered silicates modified with cationic surfactant |
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| Authors: | M. Yu. Trifonova S. A. Dolenko S. V. Bondarenko Yu. I. Tarasevich |
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| Affiliation: | (1) State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, 230026, Anhui, P.R. China;(2) CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Mechanics and Mechanical Engineering, University of Science and Technology of China, Hefei, 230027, P.R. China;(3) Department of Chemistry, University of Science and Technology of China, Hefei, 230026, Anhui, P.R. China; |
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| Abstract: | The interaction of anionic organic dyes with layered silicates (kaolinite and hydromica) both natural and modified with a cationic surfactant (cetylpyridinium bromide) is studied by adsorption and spectral methods. The adsorption of organic anions by modified silicates is proved to proceed via the formation of ionic associates of these adsorbates with the modifier. It is found that the interaction of large organic anions with the modifier results in the desorption of the latter, followed by its secondary adsorption in the form of ionic associates with the adsorbates. The selectivity of layered silicates modified with the cationic surfactant to organic anionic dyes is determined by the stability of the formed dye/modifier ionic associates and their affinity to the surface. These factors depend on the sizes of the hydrocarbon moieties of both components of the associates. Therefore, the selection of a suitable modifier allows one to control the selectivity of modified minerals to different organic anions. Using long-chain organic cations as modifiers, organic anions of any sizes can be extracted from aqueous solutions. |
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