Mechanism of extracting palladium(Ⅱ) withcyclic sulfoxide derivatives

来源期刊：中国有色金属学报(英文版)2004年第1期

论文作者：吴松平 孟淑媛 古国榜 庄志强 刘会冲

文章页码：202 - 207

Key words：cyclic sulfoxide; palladium; solvent extraction; tetrahydrothiophene-1-Oxide

Abstract: The extraction ability of palladium(Ⅱ) from acidic media with cyclic sulfoxide derivatives—α-Dodecyl-tetrahydrothiophene 1-Oxide ( DTMSO ),α-octyl-tetrahydrothiophene 1-Oxide ( OTMSO ) andα-butyl-tetrahydrothiophene-1-Oxide (BTMSO) was investigated. The extracting efficiency of cyclic sulfoxide derivatives decreased with the increasing of acidity in the lower acidity, and the efficiency became stable with the change of acidity in the higher acidity. The extraction reaction of palladium(Ⅱ)with DTMSO is exothermic, and extraction reaction of palladium(Ⅱ)is endothermic when OTMSO or BTMSO were used as extracting reagents. The coordination number was studied by slope method. The results indicate that coordination number is 2, and the composition of complex is (PdCl₂)·2RTMSO. FTIR spectra were used to analyze the structure of complex and coordinated atom in complex, Pd is coordinated with both oxygen and sulfur atom in S=O group in sulfoxide derivatives.