Extraction of uranium from acidic solutions by TBP impregnated polyurethane foam

Abstract

Polyurethane foams can be used as a selective absorbent for a number of substances from dilute aqueous solutions. Absorption of uranium (VI) has been investigated using an open-cell polyurethane foam impregnated with tri-butyl phosphate (TBP). The extraction efficiency was observed to depend on the pH of the uranium solution and the concentration of uranyl ions. Also, the effects of TBP concentration, temperature, and squeezing time on the extraction of uranium were examined.

Recovery and Separation of Metal Ions from Aqueous Solutions by Solvent‐Impregnated Resins

“…Huynh and Tanaka [35] made a bis(2-ethylhexyl)phosphoric acid (D2EHPA)-impregnated kapok fiber, which can provide higher metal removal rates compared to SIRs using XAD-7HP as the support. Open-cell polyurethane foam [36,37], silica gel [38], and porous silica [39] have also been reported for preparation of solvent-impregnated adsorbents.…”

“…The extraction of Th(IV) and U(VI) is a hot spot because they are important elements in view of the nuclear energy industry but also cause some environmental difficulties. The adsorption and extraction of U(VI) from dilute aqueous solutions by polyurethane foam impregnated with 5,8-diethyl-7-hydroxy-6-dodecanone oxime (LIX 63) [120] and TBP [121] have been early reported, respectively. By XAD-16 loaded with N,N-dibutyl-N -benzoylthiourea (DBBT), quantitative recovery of U(VI) can be achieved from solutions containing impurity ions, such as Zn(II), Cd(II), Co(II), and Cd(II) [122].…”

Studies on Uranium Recovery by Activated Carbon Impregnated With Tridodecylamine and Tributyl Phosphate

“…The decrease in uranium loading efficiency after pH 5 and 5.2 for both sorbents is probably due to the precipitation of uranium ions as their corresponding hydroxides. In addition, the amines convert free salts up to pH 5 (Merritt, 1971;Ölmez and Eral, 1994).. Accordingly, it can be mentioned that the pH range of 2 to 5 can be considered to be the optimum and the chosen value is actually 3.43 for TDA impregnated AC while a pH of 5.2 is chosen as an optimum value for the TBP impregnated AC.…”

Strategies for Organic Drug Synthesis and Design. By Daniel Lednicer.

“…Huynh and Tanaka 35 made a bis(2‐ethylhexyl)phosphoric acid (D2EHPA)‐impregnated kapok fiber, which can provide higher metal removal rates compared to SIRs using XAD‐7HP as the support. Open‐cell polyurethane foam 36, 37, silica gel 38, and porous silica 39 have also been reported for preparation of solvent‐impregnated adsorbents.…”

“…The extraction of Th(IV) and U(VI) is a hot spot because they are important elements in view of the nuclear energy industry but also cause some environmental difficulties. The adsorption and extraction of U(VI) from dilute aqueous solutions by polyurethane foam impregnated with 5,8‐diethyl‐7‐hydroxy‐6‐dodecanone oxime (LIX 63) 120 and TBP 121 have been early reported, respectively. By XAD‐16 loaded with N , N ‐dibutyl‐ N′ ‐benzoylthiourea (DBBT), quantitative recovery of U(VI) can be achieved from solutions containing impurity ions, such as Zn(II), Cd(II), Co(II), and Cd(II) 122.…”