Study Of Transport And Separation Of Cu(â…¡) By Solvent Extraction And Hybrid Liquid Membrane Containing A Novel Extractant SIOMEX N902

In this text transport of Cu(â…¡) ions was investigated by a hybrid liquid membrane (HLM) containing a N902 in kerosene and with microporous polypropylene Celgard 2500 as solid supports. Factors affecting transport of Cu(â…¡), such as the stirring rate in aqueous feed and organic solution, the stripping reagents and their concentration, membrane composition, and pH of the feed solution have been analyzed. A mathematical modes for the transport of Cu(â…¡) ions through HLM was deduced according to interface chemisty and mass transfer kinetic.The concrete work includes:(1) The interfacial tensions of N902- kerosene/feed phase and N902- kerosene/stripping phase liquid-liquid system were systematically determined by drop volume method. The interfacial adsorption parameters, C_AC,C_min,Ï„_min,A₁ and the feed energy of adsorptionâ–³G_ad of N902- kerosene/feed phase (or stripping phase) liquid-liquid system have been calculated, such as below 1.315μmol/L,0.152mol/L,1.64μmol/m^-2,1.02nm²,-0.342kJ/mol(0.112μmol/L,0.28mol/L,1.45μmol/m^-2 1.11nm² -0.302kJ/mol),respectively.(2) The influence of pH in feed solution, ionic strength of the feed solution, concentration of Cu(â…¡), the time of extraction equilibium and carrier concentration on extraction of Cu(â…¡) were investigated according to solvent extraction. The results show that 1 mol Cu(â…¡) reacts with 2 mol carriers to form extracted species and equilibrium constant K_ex=22.18 for extraction reaction. (3) The HLM experiments verified that the transport of Cu (â…¡) ions is coupled by the counter-transport flow of protons. The theoretical equation of transport flux of Cu(â…¡) ions across HLM has been deduced, treating the double solid membranes of HLM as a single membrane with twice the geometrical thickness of the polymer support. The effect of different variables on the transport of Cu (â…¡) were studied. The experiments verified that the reaction was simultaneously controlled by extraction reaction and diffusion for extractor concentration below 2.5%(w/w) and by diffusion only for extractor concentration beyond 2.5%(w/w).(4) The transport of Cu (â…¡) ions follows the formalism of two consecutive irreversible first-order reactions. The activation energy values are 30.4 kJ·mol^-1 for extraction and 25.2 kJ·mol^-1 for stripping.