An insight into the sequestration of tetra and hexavalent actinides by tri ethoxysilyl-amino-propyl-3-oxa-glutaramic acid (SAPOGA) functionalized titania

Abstract

Silyl-amino-propyl-3-oxa-glutaramaic acid (SAPOGA) functionalized titania has been synthesized for highly efficient solid phase sequestration of thorium and uranyl ions from the aqueous acidic waste stream. The XRD pattern suggested that...

Novel N-Substituted 2,2′-Oxydiacetic Acid Diamide-Functionalized Silica Resins: An Efficient Sorbent for Removal of U(VI) and Th(IV) Present in Nitric Acid-Rich Effluents

“…Application of 1 mM EDTA did not improve the scenario, while Na 2 CO 3 and oxalic acid solutions were found to be suitable for both UO 2 2+ and Th 4+ , respectively. Similar stripping agents, i.e., Na 2 CO 3 for UO 2 2+ and oxalic acid for Th 4+ , have also been reported in the literature . A single contact of 1 mM Na 2 CO 3 was found to strip back almost 95.1% and 92.6% of UO 2 2+ from R1 and R2, respectively.…”

“…Similar stripping agents, i.e., Na 2 CO 3 for UO 2 2+ and oxalic acid for Th 4+ , have also been reported in the literature. 42 A single contact of 1 mM Na 2 CO 3 was found to strip back almost 95.1% and 92.6% of UO 2 2+ from R1 and R2, respectively. 1 mM oxalic acid also showed similar recovery (∼94.5 and 93% for R1 and R2, respectively) for Th 4+ from loaded sorbent materials.…”

Diglycolamic Acid-Functionalized MWCNT-Augmented Polymeric Beads for Efficient Separation of Trivalent Lanthanides and Actinides

“…Although most of the spectra were consistent with those of pristine polysulfone beads due to the small DGA-CNT content, a characteristic peak for the carbonyl group (>CO) was observed at 1665 cm –1 . − Also, the peak increased with increasing load of DGA-CNTs in polysulfone. Furthermore, the −OH bending peak for carboxylic acid was also observed at 1405 cm –1 . − The observations confirm the incorporation of DGA-CNTs into the polysulfone polymeric beads. Furthermore, the highly porous nature of the PS beads was confirmed by the SEM image of pristine beads (Figure c).…”

“…In order to understand the sorption process in more detail, the kinetic data was fitted to various sorption models, such as Lagergren (pseudo-first-order), intraparticle diffusion, and pseudo-second-order kinetics models. The Lagergren’s first-order kinetics is represented by the following equation ,, log ( q normale − q t ) = loq 0.25em q e − kt 2.303 where q e and q t are the amounts of radionuclides adsorbed by the PS-DGA-CNT beads at equilibrium and at time t , respectively; k is the adsorption rate constant and t is the time in minutes. The linear regression coefficients for the Lagergren first-order kinetic model for Am 3+ and Eu 3+ were found to be 0.9668 and 0.9465, respectively.…”