Study On Separation Of Binary Cd(Ii) And Zinc(Ii) By A Tri-N-Octylamine-Secondary Octyl Alcohol-Kerosene Hybrid Liquid Membrane

In this article, the separation of Cadmium (II) and Zinc (II) from wasted water by a Tri-n-octylamine (TNOA)-secondary Alcolhol (ROH)-kerosene hybrid liquid membrane (HLM) system was studied. The influence of Cl-, Br-, HNO3 concentration in feed phase, and TNOA concentration in membrane phase on transport and separation were determined through extraction experiment and membrane transport process. The experiments demonstrate that Cd (II) can be transported selectively from the binary Cd (II) and Zn (II) solution and that Cd (II) and Zn (II) can be separated well. The experiment indicates that the transport percentage of Cd (II) exceeds 92% and Zn (II) is only 3% when concentration ratio of Cd (II) to Zn (II) is 1 to 5 in feed phase after transport of 21 hours. Theory analysis shows that double solid membranes of HLM can be treated as a single membrane with twice the geometrical thickness of the polymer support. The uptake of TNOA content from membrane phase into feed phase and stripping phase is determined. The experiments show that FILM can prevent TNOA from loss out of membrane phase and prolong the lifetime of liquid membrane.