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E-Journal of Chemistry
Volume 9, Issue 2, Pages 756-765
http://dx.doi.org/10.1155/2012/802621

Separation Studies of Pd(II) from Acidic Chloride Solutions of Pt(IV), Ni(II) and Rh(III) by Using 4-Aroyl-3-Phenyl-5-Isoxazolones

1Department of Nanomaterial Chemistry College of Science & Technology, Dongguk University 707 Seokjang-Dong, Gyeongju, Gyeongbuk -780 714, Republic of Korea
2Department of Chemistry (GEBH) Sreevidyanikethan Engineering College (Atonomous), Sri Sainath Nagar-517 501 A.Rangampet, Tirupathi, Andhrapradesh, India

Received 25 October 2011; Accepted 30 December 2011

Copyright © 2012 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This study examined the effect influence of various factors on the extraction of Pd(II) to develop a new liquid-liquid extraction mechanism for the selective separation of palladium(II) from its acidic chloride solutions using 4-aroyl-3-phenyl-5-isoxazolones (HA), such as 3-phenyl-4-(4-fluorobenzoyl)-5- isoxazolone (HFBPI), 3-phenyl-4-benzoyl-5-isoxazolone (HPBI) and 3-phenyl-4- (4-toluoyl)-5-isoxazolone (HTPI). The extraction strength of Pd(II) with HA were in the following order: HFBPI > HPBI > HTPI, which is opposite to that observed with their pKa values. HPBI was used to separate Pd(II) from Pt(IV), Ni(II) and Rh(III) metal ions and calculated their separation factors (S.F.) were followed in the order: Pd/Ni (40±0.4) > Pd/Pt (25±0.2) > Pd/Rh (15±0.3 > Rh/Ni (2.7±0.3) > Pt/Ni ≈ Rh/Pt (1.7±0.2). The loading and striping of Pd(II) (1.12×10-4 mol L-1) were also examined using 1.0×10-3 mol L-1 HPBI in CHCl3 and 1.0 mol L-1 HCl, respectively. The results demonstrated that the maximum (97.5%) extraction and desorption (89%) of metal required at least 3.0 cycles. The developed method was applied successfully to the separation of palladium from synthetic water samples.