Thioether-Functionalized Vegetable Oils: Metal-Absorbing Biobased Ligands
2013
Murray, Rex E. | Bantchev, Grigor B. | Dunn, Robert O. | Ascherl, Kim L. | Doll, Kenneth M.
Vegetable oils containing thioether groups have been synthesized and used to effectively remove heavy metal ions from aqueous solution. The use of thioether-functionalized corn oil (TF-corn oil) and thioether-functionalized canola oil (TF-canola oil) were both effective in the extraction of Ag⁺ from a 600 ppm aqueous silver nitrate solution. The TF-corn oil reduced the observed silver in solution to a level below the detection limit, whereas the TF-canola oil was only able to remove slightly over 50% of the concentration. A study of the absorption rate is also reported, where both the TF-corn oil and the TF-canola oil removed the Ag⁺ rapidly, at nearly the same rate. Preliminary results suggest that the efficacy and capacity of silver removal relates directly to the fatty acid composition of the oil precursor.
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