Simultaneous transport of seven heavy metal cations using phosphoric tri-(4-chloro aniline) carrier by bulk liquid membrane technique and the complexation of a numeral ions by conductometry

S Akbari, R Khoshnood, M Pourayoubi
2017 Bulgarian Chemical Communications, Special Issue J   unpublished
The fluxes and selectivity for competitive of Co 2+ , Ni 2+ , Cu 2+ , Zn 2+ , Ag + , Cd 2+ and Pb 2+ metal cations transport across bulk liquid membranes by phosphoric tri(4-chloro aniline) ligand were determined using some organic solvents as membranes. The membrane solvents include chloroform (CHCl3), dichloromethane (DCM), 1,2-dichloroethane (1,2-DCE) and nitrobenzene (NB). The transport process was driven by a back flux of protons maintained by the buffering the source and receiving phase
more » ... d receiving phase with pH 4.9 and 3.0, respectively. The selectivity order and the transport rates for competitive bulk liquid membrane transport of the studied seven heavy metal cations are strongly sensitive to the nature and also the type of the organic membrane phases. The obtained results show that, among the used organic solvents as liquid membranes, the most transport rate was dedicated to DCM organic solvent for all of the seven studied metal cations by tri(4-chloro aniline) ligand. The competitive transport rate of Zn 2+ metal cation was also studied in DCM at different times and showed that optimum time is 18 hour. Also, the effect of fatty acids as surfactant on the transfer percent of Zn 2+ cations were studied in presence of the several fatty acids such as: palmitic acid (P.A), stearic acid (S.A), terephthalic acid (T.A) and fumaric acid (F.A) in DCM organic solvents.In addition to, the complexation reaction between a numeral these metal cations with phosphoric tri(4-chloro aniline) were studied in pure acetonitrile (AN) at different temperatures of 15℃, 25℃, 35℃ and 45℃ using the conductometric method. The conductance data show that the complexes with stoichiometry of 1:1 (L:M) were formed between phosphoric tri(4-chloro aniline) ligand and these metal cations. Also, the values of complex formation constants and thermodynamic parameters (∆í µí°º í µí± ° , ∆í µí°» í µí± ° , ∆í µí±† í µí± °) for these complexes in pure AN solvent were obtained from temperature dependence of stability constants.
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