3 years ago

Novel synthetic clays for the adsorption of surfactants from aqueous media

Novel synthetic clays for the adsorption of surfactants from aqueous media
The aim of this work was to assess for the first time the use of two high-charge swelling micas (Na-Mica-4 and C18-Mica-4) for the removal of four linear alkylbenzene sulfonates (LAS) from aqueous samples. To this end, Na-Mica-4 was synthesized and organically functionalized with cations of octadecylamine to obtain C18-Mica-4. Na-Mica-4 and C18-Mica-4 were characterized by X-Ray diffraction, Zeta potential, specific surface area and thermogravimetric analysis before and after the adsorption experiments. LAS removal studies were carried out in water samples spiked with a LAS mixture (10 mg L−1). Removal rates with C18-Mica-4 were between 94% and 97% at pH = 2, and between 98% and 99% at pH = 5 after 1 h. For the same amount of Na-Mica-4, removal rates were between 54% and 81% at pH = 2, and between 24% and 66% at pH = 5 after seven days. No significant effects on the removal rates of C18-Mica-4 were observed for pH values between 0.5 and 9. The experimental equilibrium data were fitted to 30 min, with removal rates of up to 98% in all the experiments. C18-Mica-4 characterization tests indicate that LAS adsorption occurs in the interlayer space. Finally, C18-Mica-4 was applied successfully to the removal of the target compounds from influent and effluent wastewater, surface water and tap water samples.

Publisher URL: www.sciencedirect.com/science

DOI: S0301479717310496

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