In the high-level radioactive waste liquid separation process of spent fuel reprocessing

new separation materials are of great significance for the efficient extraction of strontium. In the paper

1

2-alternate thiacalix[4]biscrowns 4 (TCACE) was synthesized by using calix[4]arene and triethylene glycol di(p-toluenesulfonate). TCACE was characterized by FT-IR

1H NMR and MS. The influence of different diluents on extraction rate was studied

and CH2Cl2 was chosen as diluent by optimization. Extraction rate of Sr2+ was excellent and average mass transfer coefficient was 1.36×10-5 m·s-1 under the conditions of CH2Cl2 as organic solvent

nitrate acid concentration was 3 mol·L-1

TCACE concentration was 1×10-3 mol·L-1

Sr2+ concentration was 5×10-4 mol·L-1

extraction was conducted for 80 min and at 25℃. Different technological conditions on extraction for Sr2+ were studied. Furthermore

the extraction measurement equation was also studied. The extraction complex was {Sr(NO3)2}·{TCACE} as shown by experiment. The extraction effects for other metal ions Mo6+

Ni2+

Ag+

Sn4+ with TCACE were also studied. It was found that TCACE showed excellent selectivity for Sr2+.