季铵树脂上硫酸铀酰络离子的红外光谱研究

本文用红外光谱研究了季铵树脂吸附的硫酸铀酰络合物。树脂吸附UO_2(SO_4)_2~(2-)时,UO_2~(2+)的γ_3峰值为918cm~(-1),吸附UO_β(SO_4)_3~(4-)时,该峰值为910cm~(-1)。树脂在组成接近铀水冶条件的吸附液中吸附平衡后,吸附n值为2.5—2.7的UO_2(SO_4)_n~(2-2n),其UO_2~(2+)的γ_3峰与树脂的季铵峰合并于900cm~(-1);该树脂在KBr压片中会发生转换反应,使硫酸铀酰络离子转成UO_2(SO_4)_2~(2-)和SO_4~(2-)。还利用红外光谱定量测定反应终了的自由硫酸根量,在化学当量法求得的树脂吸附铀量及SO_4~(2-)量基础上,计算了n值。

A STUDY OF URANYL SULPHATE COMPLEXES ON QUATERNARY AMMONIUM RESIN WITH INFRARED SPECTROMETRY

In this paper uranyl sulphate species adsorbed on quaternary ammonium resin are studied with infrared spectrometry. It has been found that when UO2 (SO4) 22- or UO2 (SO4) 34- is adsorbed the asymmetric stretch of UO22+, v3, is observed at 918 cm-1 or 910 cm-1 respectively. When the resin is brought io equilibrium with the solution similar to that used in uranium hydro-metallurgy, the value of n in the complex UO2(SO4)n2-2n is 2.5-2.7, v3 of UO22+ and the peak assigned to quaternary ammonium group of the resin are merged at 900 cm-1 After the loaded resin is pressed into disks with KBr, exchange reaction takes place, thus uranyl sulphate complexes turn to UO2(SO4)22- and SO42. According to the amount of U and SO42- on loaded resin found from chemical equivalent method and the final free SO42- determined by IR, the value of n is calculated.