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Vol. 27 No. 8 (2015): Vol 27 Issue 8

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Separation of Iridium from Hydrochloric Acid Medium Using Microspheres Containing 2-Ethylhexyl Benzimidazolyl Sulfoxide

https://doi.org/10.14233/ajchem.2015.18861
Yan Liu
Department of Chemistry, Yunnan University, Kunming 650091, P.R. China
Jinfei Li
Department of Chemistry, Yunnan University, Kunming 650091, P.R. China
Zhangjie Huang
Department of Chemistry, Yunnan University, Kunming 650091, P.R. China
Lin Yang
Department of Chemistry, Yunnan University, Kunming 650091, P.R. China
Wanqiu Liu
Department of Chemistry, Yunnan University, Kunming 650091, P.R. China

Corresponding Author(s) : Zhangjie Huang

zhjhuang@ynu.edu.cn

Asian Journal of Chemistry, Vol. 27 No. 8 (2015): Vol 27 Issue 8

Abstract

The extraction of iridium(IV) from hydrochloric acid medium was carried out using the microsphere containing 2-ethylhexyl benzimidazolyl sulfoxide as the extractant. The sorption was found to be fast, equilibrium was reached within 6 min. When the concentration of Ir(IV) was 200 mg L-1, nearly all of the Ir(IV) (> 99 %) was adsorbed by the microspheres in 4 mol L-1 HCl medium. The sorbed Ir(IV) ions were desorbed with 0.5 wt. % sodium hydroxide solution. The sorption data could be well interpreted by the Freundlich isotherm model with the maximum adsorption capacity of 80 mg g-1 (25 °C) of Ir(IV) on the microsphere. Iridium(IV) and rhodium(III) could be separated completely with a separation coefficient of Ir(IV) and Rh(III) (1.36 × 104) using the optimal separation parameters. The microspheres can be reused at least in 20 cycles of extraction-stripping process.

Keywords

Iridium Solid phase extraction Microspheres 2-Ethylhexyl benzimidazolyl sulfoxide
Liu, Y., Li, J., Huang, Z., Yang, L., & Liu, W. (2015). Separation of Iridium from Hydrochloric Acid Medium Using Microspheres Containing 2-Ethylhexyl Benzimidazolyl Sulfoxide. Asian Journal of Chemistry, 27(8), 3049–3053. https://doi.org/10.14233/ajchem.2015.18861
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