engleski

REMOVAL OF METAL-COMPLEX BY CROATIAN CLINOPTILOLITE

This study show the investigation of possibilities for application of natural zeolite from Donje Jesenje mine(Croatia ) in process of metal ions removal (zinc, chromium) as well as their complex compounds from galvanization and dyes industry wastewaters. Natural zeolites show affinity towards the metal ions and they found wide range of application for metal ions removal from water solution what is shown in several publications (Cerjan-Stefanović et al., 1996, Vassilis  Grogoropoulou, 2003). Detail characterization of natural zeolite includes roentgen diffraction structural analysis, differential thermal analysis, measurements of specific area and density. Metal species are determined by UV/VIS and AAS. The influence of natural zeolite treatment (granulometric and chemical treatment, time of equilibrium, concentration and pH value of metal ions solution, type and concentration of ligand) on capacity and selectivity of ions removal has been investigated. It is proved that mentioned parameters have great influence on ion exchange processes of zeolite and metal ions (Rožić  Cerjan-Stefanović, 2002). Natural zeolites in contact with zinc and chromium ions is a complex problem, because of the appearance of zinc and chromium in several ionic shapes ( Zn+2, ZnO2- , Cr +3, CrO2-) towards which zeolite has different affinity (Pansini et al., 2001). The influence of ligand in metal – complex compounds on metal ion removal can be curtail, depending on metal – ligand, metal – zeolite and ligand - zeolite bounding strength (Koprivanac et al.1997) . The influence of ligand on ion exchange processes of zeolites - zinc and chromium will be investigated. Obtained results will be the basis for Paterson and Langmuir isotherm.

REMOVAL OF METAL-COMPLEX; CROATIAN CLINOPTILOLITE

nije evidentirano