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• W4386052071 abstract "In view of the limited availability of acid-stable solid-phase extractants for removal of U(VI) and Th(IV) present in nitric acid-rich effluents, two novel N-substituted 2,2′-oxydiacetic acid diamide-functionalized silica resins (denoted as R1 and R2) are synthesized by the successive processes of condensation of 3-aminopropyl triethoxysilane (APTES) on silica gel followed by chemical modification of the −NH2– group using 2-((N,N-dialkylcarbamoyl)methoxy)acetic acid. Synthesized resins were characterized by ATR-FTIR, solid-state 13C/29Si (CP/MAS) NMR, TGA, and SEM-EDS techniques. Notably, high sorption efficiencies of U(VI) and Th(IV) were obtained at 4.0 M HNO3 feed acidity, highlighted by their high Kd (mL g–1) values, R1: U(VI): 5.5 × 103, Th(IV): 1.2 × 104; R2: U(VI): 4.2 × 103, and Th(IV): 1.01 × 104, respectively. 0.01 M HNO3, Na2CO3, and oxalic acid can act as suitable desorbing agents for both resins R1 and R2 loaded with U(VI) and Th(IV). Maximum desorption of U(VI) and Th(IV) can be achieved using 10–3 M of Na2CO3 and oxalic acid, respectively. In contrast to the other solid-phase extractants, the N-substituted 2,2′-oxydiacetic acid diamide-functionalized extractants have exceptionally high acid stability. UV–VIS spectroscopic study of the feed and raffinate solutions used in the column study confirms effective removal of U(VI) and Th(IV)." @default.
• W4386052071 created "2023-08-23" @default.
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• W4386052071 date "2023-08-22" @default.
• W4386052071 modified "2023-09-23" @default.
• W4386052071 title "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" @default.
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• W4386052071 doi "https://doi.org/10.1021/acs.iecr.3c01729" @default.
• W4386052071 hasPublicationYear "2023" @default.
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