Chinese Journal of Applied Chemistry ›› 2019, Vol. 36 ›› Issue (3): 335-340.DOI: 10.11944/j.issn.1000-0518.2019.03.180227

• Full Papers • Previous Articles     Next Articles

Palladium(Ⅱ) Extraction Using Different Ionic Liquid-Based Aqueous Biphasic Systems

SONG Feiyuea,XUE Yongboa,GAO Xina,BAI Linga,LI Jinga,DENG Yuna,XIE Lijuana,RUAN Wenquanabc*()   

  1. aSchool of Environment & Civil Engineering;
    bJiangsu Key Laboratory of Anaerobic Biotechnology,Jiangnan University,Wuxi,Jiangsu 214122,China
    cJiangsu Collaborative Innovation Center of Technology and Material of Water Treatment,Suzhou,Jiangsu 215009,China
  • Received:2018-06-28 Accepted:2018-10-11 Published:2019-03-01 Online:2019-02-28
  • Contact: RUAN Wenquan
  • Supported by:
    Supported by the Fundamental Research Funds for the Central Universities(No.JUSRP11521)

Abstract:

To establish a green and efficient method to extract the precious metal palladium, we used an aqueous biphasic system(ABS) formed by “green solvent” ionic liquids and potassium phosphate to extract Pd(Ⅱ) without additional extractants. We also determined the binodal curves and tie-lines of 6 imidazolium-based ionic liquids by turbidity point method. The results indicate that there is no significant difference in phase forming ability and extraction rate between chloride-based and bromide-based ionic liquids. The hydrophobicity of the side chain on the cation is one of the key factors affecting phase forming ability of ionic liquids. Compared to ionic liquid without functional groups on the side chain of cation, the introduction of amino group and nitrile group on the side chain reduces the phase forming ability, but increases the extraction rate by 11.57% and 34.26%, respectively. Moreover, the extraction rate by ionic liquid with nitrile group could reach 100% when the concentrations of ionic liquid and potassium phosphate were 5.00% and 39.55%, respectively. The conclusions of this work could provide theoretical basis and data support for the design or choose of ionic liquids for efficient extraction of palladium(Ⅱ) by its aqueous biphasic system.

Key words: ionic liquid, aqueous biphasic system, palladium, extraction