engleski

Removal of the Cu(II) complex dyes from wastewater with natural zeolite

Zeolites are a class of aluminosilicate minerals, which have a wide application either as ion exchangers, catalysts, adsorbents, membranes or additives in different types of chemical industries. Their different chemical and physical properties enable them to be applied as alternative materials in environmental-friendly processes. The present work concerns the investigation of the potential application of natural and synthetic zeolites to the removal of Cu(II) complex dyes: 2-[(2-pyridylmethylene)amino]phenol copper(II) and 2-[(2-qynolylmethylene)amino]phenol copper(II), from colour-containing wastewaters. The X-ray diffraction data have shown that Cu(II) ions with 2-[(2-pyridylmethylene)amino]phenol form a very large cationic complex of M2L2 (metal:ligand) stoichiometry with an acetate as a bridging group between two copper ions and perchlorate as anion, while the Cu(II) ions with 2-[(2-qynolylmethylene)amino]phenol form neutral type of 1:1 complex with an acetate ion in the coordination sphere. The treatment efficiency with natural Croatian zeolitic material containing 67% clinoptiolite has been compared with some synthetic zeolites. The results of this study could be a significant contribution to still deficient field of wastewater treatment and especially for removal of metal complex dyes by means of zeolites avoiding the enrichment of water with toxic cations.

Cu(II) complex dyes; wastewater; natural zeolite

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