Separation of uranium from seawater by adsorbing colloid flotation

Abstract

A procedure is described for the separation from seawater of uranium present as the stable tricarbonatouranyl anion by an adsorbing colloid flotation technique which utilizes a collector-surfactant-air system. At pH 6.7 ± 0.1 the uranium is adsorbed effectively on the positively charged ferric hydroxide collector. Upon addition of the anionic surfactant, . sodium dodecyl sulfate, and the bubbling of air through the seawater, the colloidal particulates of ferric hydroxide enriched with uranium by absorption are floated within 2-3 minutes to the surface as a stable froth which is easily removed. Uranium was analyzed

Determination of Ultra Trace Level of Uranium in Ground Water of Different Geo-Chemical Environment by Adsorptive Stripping Voltammetry

“…This accumulation, in turn affects the adsorption of uranium-chloroanilic complex on the electrode surface but this was not observed in the Cl −1 concentration range of 20-24,000 ppm. Direct determination of uranium in sea water where average Cl −1 concentration in the range of 17,000-19,000 ppm were made by Singhal et al (2005a); Branica (1991, 1995); Kim and Zeitlin (1971). Similarly in the case of F −1 and PO 3À 4 there is strong tendency for the uranium either to form its fluoride complex or uranyl phosphates (UO 2 ) 3 (PO 4 ) 2 .…”

Determination of submicrogram levels of phenol in water

“…Because of the inherently greater sensitivity of the reaction with MBTH than with 4AAP, it was not necessary to optimize conditions as carefully to obtain the same sensitivity. Essentially, the conditions described by Friestad et al ( 4 ) were used in the color-forming reactions, modified for the large distillation volume. Two changes were made: it was necessary to add the EDTA very early in the system to avoid precipitation of cerium hydroxide on neutralization; and the buffer was changed to facilitate obtaining a final pH of 7.3-7.6 and thus an optimum intensity of color.…”

U(VI) adsorption onto cetyltrimethylammonium bromide modified bentonite in the presence of U(VI)-CO3 complexes

“…In view of the anticipated depletion of terrestrial uranium reserves, the possibility of recovering uranium from seawater has received increasing attention for decades (Kim and Zeitlin, 1971;Schenk et al, 1982;Saito et al, 1987;Egawa et al, 1992;Das et al, 2008), since the total amount of uranium in seawater is estimated at 4.5 billion tons, which is nearly a thousand times larger than the terrestrial resources (Tian et al, 2012). As concentrated seawater, salt lake brine is regarded as another ideal resource of uranium recently.…”