标题：Structural effect of N,N-dialkylamide in toluene on the extraction of uranium(VI)
作者：Sun, GX; Han, JT; Bao, BR; Sun, SX
作者机构：[Sun, GX; Han, JT; Bao, BR; Sun, SX]Chinese Acad Sci, Inst Nucl Res, Shanghai 201800, Peoples R China.;[Sun, GX; Han, JT; Bao, BR; Sun, SX 更多
通讯作者地址：[Sun, GX]Chinese Acad Sci, Inst Nucl Res, POB 800-204, Shanghai 201800, Peoples R China.
来源：JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
摘要：N,N-dialkylamides having ethyl (DEDOA), butyl (DBDOA) and octyl (DODOA) groups as the alkyl substituents were synthesized in order to investigate their selectivity and capability in the extraction from acidic nitrate media in nuclear reprocessing. The extraction distribution coefficients of U(VI) with the amides in toluene decrease in the order of DODOA > DBDOA > DEDOA. The structure of the extracted species was suggested from the dependence of the distribution ratio on the concentration of the extractant, with the aid of FT-IR spectra. The structural effect on the extraction capability of U(VI) was discussed in terms of the molecular modelling. The effects of temperature on the distribution ratios were also considered, and the extraction reaction enthalpy was calculated.