The coordination properties of anthraquinone ligands bearing N-heterocyclic coordination sites to divalent cobalt and trivalent iron and chromium metal complexes have been described and characterized as mono and binuclear complexes. Although 4-(2'-amino benzene sulfonic acid)azo-(2''-N-(4''',6'''-dichloro-s-triazine)benzene-5''-(β-sulfatoetylsulfonyl)-2-methylanthraquinone was found to form complexes having a ligand to the metal ratio of 2:1 with ferric and cobalt ions, 4-(2'-amino benzene sulfonic acid)azo-(2''-N-(4''',6'''-dichloro s-triazine) naphtaline-5''-sulfonic acid)-2-methyl anthraquinone gave a complex in a molar ratio of about 1:1 with Fe(III). Spectral results showed that the complexes have octahedral geometry. Antibacterial data showed that the complexes have medium antimicrobial activity against Staphylococcus aureus and clinical isolates strains.
The biosorption of lead, copper and zinc ions on Rhizopus arrhizus has been studied for three single-component and two binary systems. The equilibrium data have been analysed using the Freundlich adsorption model. The characteristic parameters for the Freundlich adsorption model have been determined and the competition coefficients for the competitive biosorption of Pb(II)-Cu(II) at pH 4.0 and 5.0, and Pb(II)-Zn(II) at pH 5.0 have been calculated. For the individual single-component isotherms, lead has the highest biosorption capacity followed by copper, then zinc. The capacity of lead in the two binary systems is always significantly greater than those of the other metal ions, in agreement with the single-component data. Only a partial selectivity for copper ions has been obtained at pH 4.0.
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