Change of montmorilonite surfaсe structure with cationic surfactants adsorption
DOI:
https://doi.org/10.15587/1729-4061.2014.26043Keywords:
surface adsorption, montmorillonite, quaternary alkylammonium salts, sedimentation, macroelectrophoresis, chromium, cobaltAbstract
This paper shows the influence of cationic surface-active agents (SAA) with a different structure of the hydrophobic chain on the modification of the surface structure of silicate mineral montmorillonite and adsorptive properties of the resultant sorbent for extracting ions of chromium (VI) and cobalt (II) from aqueous media. Macroelectrophoresis and sorption methods for designating the selected samples were used in the research. It was proved that increasing the amount of surfactants added to a dispersed system, long-chain surfactants tend to form more stable hemicellar structure on the clay surface and more fully recharge it. It was found that the increasing the number of the hydrocarbon chain links from 1 to 16 the physicochemical characteristics of the obtained materials are changed dramatically: the adsorption of chromium increases to about 45 mg/g, while the adsorption of cobalt falls to zero in the full range of the surface-active agents concentrations. The research results will be useful and important in obtaining sorbents for extracting chromium (VI) ions from aqueous media.
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