Chelation Effects of Surfactant in Foam Separation: Removal of Cadmium and Copper Ions from Aqueous Solution

Concentration Effects on Separation Selectivity in Foam Fractionation

“…3 for Cu2+ and Ni". Similar results for the removal of cadmium and copper ions were reported (16). The degree of selectivity in the removal of metallic ions from the solution containing three similar ions (Cd2+, Cuz+, and Ni") with 4-dodecyldiethylenetriamine was investigated under various conditions, and typical data are summerized in Table 3.…”

“…Various polyalkylenepolyamines chelate readily with metallic ions such as Cd, Cu, Hg, and Ni (14). Thus we have applied surfactants containing polyalkylenepolyamines, i.e., 4-dodecyldiethylenetriamine, to remove these Downloaded by [University of Calgary] at 23:33 02 February 2015 metallic ions from aqueous solution by foam fractionation (15,16). It was found that these metallic ions can be removed almost quantitatively from aqueous solution by using this chelating surfactant, even in the presence of a large concentration of certain other metallic ions such as Ca, Mg, and Na.…”

Foam Separation of Metals from Aqueous Thiocyanate/Alcohol Solutions

“…A similar increase of the surface properties of suspensions with increased complexation of the metal by thiocyanate and iodide was found earlier (8, 28). Moreover, Okamoto and Chou (29)(30)(31) reported similar relationships between the formation constants and surface tension of solutions of metals-4-dodecyldiethylenetriamine complexes.…”

Reactions of .alpha.-phenylpolynitrotoluenes. 4. o-Nitro rearrangements in the polynitrodiphenylmethanes

“…The product was filtered and dried and weighed 0.71 g (18%), mp 288-290 °C dec. This first isolated product was identified as the nitrosobenzophenone: NMR 5 9.30 (Pi), 7.15 (HA), 8.05 (HB), 6.98 (Hc).…”