Beginning with the formation of the ionic liquid/water two-liquid phase catalytic system for absorption of PH3, we designed and synthesized Cu+-[Bmim]PF6, which has a hydrophobic property, and later formed a two-liquid phase system with Cu+-[Bmim]PF6 and water, which has high PH3 absorption efficiency, and an effective separation of the product and the catalyst was achieved. The effects of temperature and O-2 concentration on phosphine absorption, and the distribution of catalytic components and products in the ionic liquid/aqueous two-phase system were studied. Moreover, the mechanism of Cu+-ILs/water two liquid phase catalytic oxidation of phosphine was discussed based on results from the analysis of FT-IR and ion chromatography. The results demonstrated that the optimum oxygen content in the reaction was 3%, and the optimum reaction temperature was 45 degrees C. cu(+)-ILS/water two-liquid phase system has a high absorption efficiency for PH3, the absorption process is liquid phase catalytic oxidation and the product is H3PO4. The two-liquid phase system is semi-intelligent. The system can achieve high performance liquid phase catalytic oxidation of PH3, as well as automatic separation of H3PO4. (C) 2017 Elsevier B.V. All rights reserved.