| 摘要 |
PCT No. PCT/SE90/00203 Sec. 371 Date Nov. 25, 1991 Sec. 102(e) Date Nov. 25, 1991 PCT Filed Mar. 29, 1990 PCT Pub. No. WO90/11826 PCT Pub. Date Oct. 18, 1990.A uranium adsorbent is prepared by reacting a polymer containing nitrile groups with hydroxylamine, wherein the amount of imidedioxime groups formed is relatively larger than that of amidoxime groups formed in terms of the integral values of areas of peaks respectively assigned to imidedioxime groups and amidoxime groups in the 13C-NMR spectrum chart of the adsorbent. The reaction may be effected: 1) in an organic solvent containing water under substantially neutral or weakly alkaline conditions, or 2) under acidic conditions. The uranium adsorptivity of the adsorbent is improved by hydrolyzing its residual nitrile groups under alkaline conditions. |
