A Rapid Method for the Extraction and Separation of Uranium from Thorium and Other Accompanying Elements Using Octadecyl Silica Membrane Disks Modified by Tri-n-octyl Phosphine Oxide

Solid-phase extraction–spectrophotometric determination of uranium(VI) in natural waters

“…8-Hydroxyquinoline complexes of uranium were formed and sorbed on octadecyl-derivatized silica under reversed-phase conditions [29]. Also, surface modified octadecyl (C 18 ) silica membrane containing tri-n -octylphosphine oxide has been reported for the selective extraction of uranium from aqueous solution [27,28,29,30,31]. However, most of these methods suffer from problems such as the need for high amount of ligands for modification of the disk and organic solvent to eluting the formed complex from the disk.…”

Solid phase extraction using silica gel modified with murexide for preconcentration of uranium (VI) ions from water samples

“…The sorption characteristics of SiAPMS-Mu is compared with those of other sorbents in Table 3 [7][8][9][10][11][12][13][14][15][16][26][27][28][29][38][39][40][41][42][43][44][45][46]. The new synthesized sorbent in the present study shows highest preconcentration factor for U(VI) among other modified silica gel with N-tripropionate-substituted tetraazamacrocycle [29], Quinoline-8- Table 4 Determination of U(VI) in water samples by the proposed sorbent Real sample a Added (g mL −1 ) Found (g mL −1 ) % Extraction (batch method) Added (g mL −1 ) Found (g mL −1 ) % Recovery (column method) ol [28], benzoylthiourea [26], calixarene semicarbazone [27] and catechol [41].…”

“…For this purpose, new sorbent materials such as polymeric resins, activated carbon, naphthalene and silica gel have been developed for more effective extraction. However, some of the sorbents suffer from a number of drawbacks such as long preconcentration time, low mechanical stability of the sorbent, slow kinetics, irreversible adsorption of target and swelling [7][8][9][10][11][12][13][14][15][16][17]. So, there is still a need for developing good sorbent for U(VI) ions.…”

pH dependent separation of uranium by chelation chromatography using pyridine 2,6-dimethanol as a chelator: Single crystal X-ray structural confirmation of the chelated uranium complex

“…Several authors have used a number of solid sorbents viz. octadecyl silica membrane disk [6], empore (TM) chelating resin disk [7], commercial resin [8,9], Dowex 1 × 8 and Dowex 50W × 8 [10,11], neutral polymer Amberlite XAD series [12], silica [13], activated silica gel [14], controlled pore glass [15], polyurethane foam [16] and cation or anion exchange resins [17] for the enrichment of uranium(VI) from dilute solutions prior to determination by a variety of analytical techniques. Selective binding of uranyl cation using different chelating ligands, either immobilized or chemically attached on the inert solid support like silica, alumina, naphthalene, benzophenone, polystyrene-DVB resin or activated charcoal matrix have also been reported [18][19][20][21][22][23][24][25][26].…”