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Synthesis, Characterization of Complexes of Some Transition Elements with 4,4-Bis(2,4-Dihydroxy Phenyl Azo)-O-Tolidine and Its Adsorption Studies In Carbon Activation and Some Ion Exchangers Resin | ||
| Al-Mustansiriyah Journal of Science | ||
| Article 1, Volume 20, Issue 5, 2009, Pages 35-50 | ||
| Author | ||
| Ahmed F. Kadhier | ||
| Abstract | ||
| Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II) metal complexes of aryl azo (4,4َ-bis(2,4-dihydroxy phenyl azo)-o-tolidine) [BDHAT] have been synthesized and characterized by IR, UV-Vis. and molar conductivity measurements. It has been found that the azo ligand behaves as neutral bidentate (N,O) ligand forming chelates with 2 : 1 (metal: ligand) stoichiometry. The conductivity measurements for all complexes are consistent with those expected for an electrolyte. The spectral studies showed the geometry around Co(II), Zn(II), Cd(II), and Hg(II) ions are tetrahedral, while the geometry around the Ni(II) ion is octahedral and the geometry around the Cu(II) ion is squre planar. The adsorption studies of these complexes in activated carbon and ion exchangers (cationic and anionic) showed that the high percentage adsorption in carbon activation and anion exchanger, while appeared the lower percentage adsorption in cation exchanger, and then calculated the adsorption rate constant (Kd), number of adsorption sites (1/n) and Frandlich constant adsorption (K). | ||
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