Silver extraction by N,N,N′,N′-tetraoctyl-thiodiglycolamide

The novel tridentate extractant including a soft donor group or atom has developed and was examined. The extractant, N,N,N′,N′-tetraoctyl-thiodiglycolamide (TOTDGA), is analogous structure to N,N,N′,N′-tetraoctyl-diglycolamide (TODGA), but with sulfur donor instead of ether oxygen of TODGA. TOTDGA has a unique property to extract silver from acidic solutions to n-dodecane with relatively high D values. We investigated the extraction behavior of Ag in various acids, HNO3, H2SO4, and HClO4. The results suggest that TOTDGA can extract Ag from these acids. The novel extractant, TOTDGA, is developed. This compound can extract silver from high concentrations of HNO3, HClO4 and H2SO4 into organic solvents. The optimized structures of Ag-TDGA in acids are shown. [Display omitted]