Solvent Extraction of Cesium with a New Compound Calix[4]arene-bis[(4-methyl-1,2-phenylene)-crown-6]

A new macrocyclic calix[4]arene-bis[(4-methyl-1,2-phenylene)-crown-6] (CalixBisMePhC) was synthesized. An extraction study of Cs(I), Na(I), K(I), Rb(I), Sr(II), Ba(II), Pd(II), and Ru(III) with CalixBisMePhC/CHCl 3 was investigated by examining the effects of contact time, HNO 3 concentration, and temperature. The results showed that due to the effective molecular recognition, CalixBisMePhC/CHCl 3 had excellent extraction ability and high selectivity for Cs(I) over the tested metals except Rb(I). The maximum distribution ratio for Cs(I) was found at the HNO 3 concentration of 4.4 mol·kg –1 . The composition of the extracted species of Cs(I) was determined to be CsNO 3 ·0.5CalixBisMePhC·0.5HNO 3 by a slope method. Some valuable parameters for the Cs(I) extraction were obtained. The results demonstrated that the CalixBisMePhC/CHCl 3 extraction system is promising to partition Cs(I) from highly level liquid waste.