Mechanism of extracting palladium(Ⅱ) with
cyclic sulfoxide derivatives①
cyclic sulfoxide derivatives①
(1. College of Material Science and Engineering,
South China University of Technology, Guangzhou 510640, China;
2. Guangdong Fenghua Advanced Technology (Holding)Co. Ltd, Zhaoqing 526020, China)
South China University of Technology, Guangzhou 510640, China;
2. Guangdong Fenghua Advanced Technology (Holding)Co. Ltd, Zhaoqing 526020, China)
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.
Key words: cyclic sulfoxide; palladium; solvent extraction; tetrahydrothiophene-1-Oxide