Synthesis of Calixarene Phosphinoxide Derivatives for Extraction of U(VI)

The p-tert-butylcalix[4]arene phosphinoxide derivatives and p-tert-butylcalix[6]-arene phosphinoxide derivatives were synthesized by substitution reaction.IR,1 H NMR and13 C NMR were used to characterize the compounds.The influences of pH,concentration of extractant,extraction time and temperature on the calixarene and its phosphinoxide deriva-tives' extraction of U(Ⅵ)were investigated.The results show that the extraction effect of U(Ⅵ)by p-tert-butylcalix[6]arene is higher than p-tert-butylcalix[4]arene,meanwhile,the extraction efficiencies of U(Ⅵ)by the calixarene phosphinoxide derivatives are higher than the extraction efficiencies of U(Ⅵ)by calixarenes.Compared with calixarenes,the calixarene phosphinoxide derivatives' extraction efficiencies of U(Ⅵ)are increased by 36.49% and37.61%respectively under the same condition.