title: Removal of copper ions from aqueous solutions by kaolinite and batch design.
abstract: The removal of copper ions from aqueous solutions by kaolinite was investigated by using a batch-type method. Effects of factors such as pH, ionic strength, temperature, acid-activation and calcination on copper adsorption were investigated. The uptake of copper was determined from changes in concentration as measured by atomic absorption spectrometry. The extent of copper adsorption increased with increasing pH and temperature and with decreasing ionic strength, acid-activation and calcination temperature. The Langmuir and Freundlich adsorption models were used to determine the isotherm parameters associated with the adsorption process. The results provide support for the adsorption of copper ions onto kaolinite. Thermodynamic parameters indicated the endothermic nature of copper adsorption on kaolinite. The experimental results were applied a batch design. As a result, the kaolinite may be used for removal of copper ions from aqueous solutions.
authors.affiliation: Balikesir University, Faculty of Science and Literature, Department of Chemistry, Cagis-Balikesir, Turkey. malkan@balikesir.edu.tr
authors.forename: Mahir
authors.initials: M
authors.lastname: Alkan
authors.forename: Burcu
authors.initials: B
authors.lastname: Kalay
authors.forename: Mehmet
authors.initials: M
authors.lastname: Doğan
authors.forename: Ozkan
authors.initials: O
authors.lastname: Demirbaş
mesh_terms: D000327:Adsorption; D003300:Copper / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007616:Kaolin / Q000737:chemistry*; D009994:Osmolar Concentration; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D013464:Sulfuric Acids / Q000737:chemistry; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D012996:Solutions; D013464:Sulfuric Acids; D014874:Water Pollutants, Chemical; D007616:Kaolin; D003300:Copper; C033158:sulfuric acid