Facilitated Transport of Zn2+, Ni2+ and Co2+ by Liquid Membrane Using a Tertio Amine as Carrier
Laboratory of Electrochemistry-Corrosion, Metallurgy and Inorganic Chemistry.Chemistry Faculty. University of Sciences and Technology Houari Boumediene. USTHB, Algiers, ALGERIA
The environmental impact of the emissions of heavy metals (Zn2+, Ni2+, Co2+ ) present in the industrial effluents become extensive more and more. The discharge of toxic metals into environment is a serious problem facing numerous industries. So the search for extraction techniques to remove those heavy metals are increasing interest. Liquid membranes have shown great potentiel in this way especially in cases where metal concentrations are relatively low and other techniques cannot be applied efficiently.The fundamental parameters influencing the transport of the zinc (II), nickel (II) and cobalt (II) through the liquid membrane have been examined (the acidity, the time of transport). The coupling that makes itself thanks to the membrane (extractant + diluent) permits to define the different phases of transfer and to determine the mechanisms of transportation membranaires. In thi study of th facilitated transport of zinc, nickel, cobalt ions by liquid membranes containing Tri-n-octyl amine as carrier. The chemical variable exam permitted to determine the parameters giving the extraction efficiency and reextraction optimum. Some performances have been gotten so much to the level of the extraction that of the reextraction. A chemical modelization has allowed to identify the extraction mechanism and transport. The coupling required a real optimization of the set of the parameters. The symmetrical behavior of the two compartments showed that the extraction – reextraction association permits to achieve a transportation, one counter - transportation and a positive coupling. This lets predict an applications as well in the field of metalliferous processing liquid waste not very in charge as in that of the industrial wastes. This also allows an effective protection of the environment while being profitable.
Key words: Zinc / nickel / cobalt / transport / liquid membrane / heavy metal
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