Özet:

Natural adsorbents has become more important and such a considering position that is because of increasing pollution of environment. Zinc, which is listed as prior contaminant by many agencies, is a toxic heavy metal. In this study, zinc adsorption performance of raw Ca-Bentonite obtained from Kütahya region of Turkey was investigated using batch adsorption method. X-ray diffraction (XRD), X-ray fluorescence (XRF), particle size distribution analysis, specific surface area (BET) and Cation Exchange Capacity (CEC) characterized Ca-bentonite. In batch experiments, all factors that affected adsorption process such as pH, initial metal ion concentration, adsorbent doses, and contact time were optimized. The most effective parameter on adsorption was determined as pH. The adsorption behavior of bentonites at low pH values is determined as dissolution of crystal structure and competition of the metal ions with the H+. In conclusion, raw Ca-bentonite is adsorbed successfully under the optimized reaction conditions, and adsorption behavior of Zn(II) is well-fitted by the Langmuir isotherm.

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