Uranium Sorption on Sodium Aluminosilicates and Gibbsite

Behaviour and fate of uranium in a high-level nuclear waste processing system

“…The solubilities increased with increasing temperature which agreed well with the data reported for U in the literature (Duff, 2002;Hobbs and Edwards, 1994;Puigdomenech, and Bruno, 1988;Cordfunke and Loopstra, 1971) and also for SAS solid products (Zheng et al, 1998;Barnes et al, 1999d. The equilibrium solubility (Ce) data was used together with the instantaneous U, Al(III), and SiO 2 species concentrations (Ci) to quantify the species relative supersaturations ( = Ci/Ce -1) with crystallization time.…”

“…fissionable uranium-based solid products (Hobbs and Edwards, 1994;Puigdomenech and Bruno, 1988;Chernorukov and Kortikov, 2001;Oji Williams, 2002;Duff, 2002;AddaiMensah et al, 2005AddaiMensah et al, , 2004aAddaiMensah et al, , 2004. The formation and accumulation of SAS involve an amorphous phase and three polytypes: zeolite, sodalite, and cancrinite , 2001aBarnes et al, 1999a-f).…”

Uranium sorption on bentonite modified by octadecyltrimethylammonium bromide

“…Several investigations have been completed concerning the elimination of U(VI) from the aqueous environment using different sorbents [12][13][14][15][16][17][18]. Among these studies smectites have been considered and have been found as effective in U(VI) sorption [19] due to their high cation exchange capacity and high specific surface area.…”

Properties of Uranium(VI) Adsorption by Methyl 3-O-Acetyl-5,6-dideoxy-(S)-1,2-trichloroethylidene-α-d-xylo-hept-5(E)-eno-1,4-furano-uronate

“…Hence, the solution pH affects the overall surface charge of the solid; ROH + normalH + ↔ RO normalH 2 + ROH ↔ R normalO − + normalH + where  denotes a surface of the adsorbent. Therefore, the adsorbent has a net-positive surface charge at low pH and a net-negative surface charge at high pH . On the other hand, according to Sorg (1990), the dominant species of uranium ions is UO 2 2+ in the pH range from 1 to 4.…”