Synthesis of xanthate functionalized silica gel and its application for the preconcentration and separation of uranium(VI) from inorganic components

Multivariate Optimization of a Functionalized SBA-15 Mesoporous Based Solid-Phase Extraction for U(VI) Determination in Water Samples

“…It is seen that, SBA/EnSA adsorbent for preconcentration and determination of uranium(VI) has the highest sorbent capacity. Also, the obtained LOD is comparable with that obtained by modified silica gel, 49 modified activated carbon 50 and ion imprinted polymer. 51 The linear range obtained by the proposed method is wider or better than those obtained by modified C18, 47 modified Amberlite XAD-4 52 and modified naphthalene.…”

Sonochemical recovery of uranium from nanosilica-based sorbent and its biohybrid

“…Silica based matrices has gained a lot of interest as sorbent due to their characteristic features [21] , [22] , [23] . Silica, in the form of non-functionalized nanoparticles [24] , [25] , [26] , [27] as well as functionalized mesoporous particles [27] , [28] , [29] , [30] has been widely used for sorption of uranium ions because of high reactivity and environmental mobility. For example, Functionalized silica based supports using Streptococcus lactis cells as functionalizing agent, synthesized using spray drying demonstrated good sorption characteristics, as reported earlier [29] .…”

“…Silica, in the form of non-functionalized nanoparticles [24] , [25] , [26] , [27] as well as functionalized mesoporous particles [27] , [28] , [29] , [30] has been widely used for sorption of uranium ions because of high reactivity and environmental mobility. For example, Functionalized silica based supports using Streptococcus lactis cells as functionalizing agent, synthesized using spray drying demonstrated good sorption characteristics, as reported earlier [29] . The biohybrid showed almost the same adsorption capacity (92 ± 2%) as that of activated carbon (92 ± 4%) [30] .…”

“…In the present work, parametric studies and leaching kinetics of uranium from the f BHM bio-hybrid (comprising bacterial cells and silica nanoparticles) as well as from spray dried silica microstructures (SiO 2 M) were studied. Biological components like bacterial cells are highly sensitive against various chemicals and are mechanically less stable [29] . Thus, this study helps to understand the changes/transformations happening in physical as well as chemical properties of f BHM and SiO 2 M during the process of sonochemical leaching of uranium.…”

Solid phase extraction of uranium(VI) onto benzoylthiourea-anchored activated carbon

“…So far, several solid phase extractants for selective adsorption and separation of uranium(IV) were reported. For example, activated carbon was impregnated with diarylazobisphenol (DAB) [12] or oxalic/succinic acids [13]; and silica gel was functionalized by sulfasalazine [9] or xanthate [14]; moreover, extractants based on polymeric matrix, like N,N-dibutyl-N -benzoylthiourea impregnating Amberlite XAD-16 [2] and quinoline-8-ol anchoring polymeric resin beads [8], were also studied.…”