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Liquid – liquid Extraction of Palladium by Dibenzo-18-Crown-6 from Salt’s Media. | ||
| Iraqi National Journal Of Chemistry | ||
| Article 1, Volume 0, Issue 20, 2014, Pages 521-528 | ||
| Authors | ||
| Ahmed A. AL-Kriamy; Kassim H.Kadhim; Abbas N.AL-Shirify | ||
| Abstract | ||
| Abstract Liquid-Liquid extraction of palladium by using Dibenzo-18-Crown-6 (DB18C6) dissolved in 1,2-dichloroethane (1,2-DCE) has been investigated. The distribution ratio (DPd) and percent of extraction (EPd %) were determined as a function of crown ether and palladium concentration, pH value, shaking time ,presence of salt media ( NH4Cl ,KCl, NaCl ) and solvent polarity. Depending on the mole ratio analysis method, it was suggested that the most tolerable categories were [(M+DB18C6)2 (PdCl4) 2] where M+ are ( NH4+ ,K+ ,Na+ ) The thermodynamic extraction data indicated that the extraction was dependent on the temperature and the Vant Hoff plot was linear over the temperature range studied (283-313 K). The result is ΔHex. has a positive value (endothermic) due to the extend of bonding between cation and the donor atoms of crown ether cavity and solvation energy changes, ΔSex. has a positive value, and ΔGex. has a negative value (spontaneous process) and the complex was stable at higher temperature. | ||
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