Adsorption of octa-4,5-carboxyphthalocyanine and its complexes with metalsin the water-dimethyl formamide-nonpolar adsorbent system

The adsorption of octa-4,5-carboxyphtharocyanine and its complexes with zin c, copper, cobalt(II), lead, and vanadyl from aqueous-organic solutions by a reversed-phase sorbent was studied under static conditions. Adsorption is otherms were constructed for the following solvents: dimethyl formamide-wat er (30 : 70) and dimethyl sulfoxide-water (30 : 70 and 50 : 50). The isothe rms of adsorption of phthalocyanine and metal phthalocyanines were construc ted. It was shown that the adsorption value is determined by the interactio n of the solvent with the central metal ion. The values of the limiting mon olayer adsorption, the Langmuir adsorption equilibrium constant, and the Gi bbs free energy change were estimated.