Sorption behaviour of uranium(VI) with N,N-dibutyl-N '-benzoylthiourea Impregnated in Amberlite XAD-16

The sorption of U(VI) by N, N-dibutyl, N'-benzoylthiourea (DBBT) impregnate d resin has been studied. DBBT impregnated resin was prepared by direct ads orption of chelating ligand onto macroporous support, Amberlite XAD-16. The adsorption of DBBT on the macroporous support is shown by FTIR spectroscop y to be the result of only weak chelating ligand-support interactions. Para meters such as the pH effect on the sorption of uranium, the sorption capac ity of the impregnated resin, the stripping of uranium and the effect of co existing ions were investigated by batch experiments. The results demonstra ted that uranium(VI) ions, at pH 4.5-7 could be sorbed completely using 0.1 g Amberlite XAD-16 resin loaded with DBBT. The sorption capacity of the im pregnated resin is 0.90 mmol uranium(VI) g(-1). Quantitative recovery of U( VI) is achieved by stripping with 0.1 M HNO3. The method was applied to the determination of uranium in synthetic samples. The precision of the method was 2.4 RSD% in a concentration of 1.20 mug ml(-1) for ten replicate analy sis. (C) 2001 Elsevier Science B.V. All rights reserved.