Notice of RetractionAdsorption Characteristics of Zn(II) and Cu(II) on Alkaline Ca-Bentonite

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Adsorption of Zn(II) and Cu(II) from aqueous solution on alkaline Ca-bentonite (ACB) has been studied using batch technique. Experiments were carried out as a function of solution pH, dosage of ACB and contact time in single system. Langmuir isotherm model was selected to analyze the equilibrium data for Zn(II) and Cu(II) adsorption on ACB in single and binary systems. The results indicated that ACB had about 99% Zn(II) and Cu(II) adsorption over a wide pH range 4.0-7.0. Zn(II) and Cu(II) adsorption on ACB was quick and the adsorption efficiency reached nearly 70% within 5 min for both metals. Langmuir isotherm fit the data well in single system and the Langmuir monolayer adsorption capacities of Zn(II) and Cu(II) were 208 mg/g and 192 mg/g, respectively. In the binary system, the effect of mixture on ACB was found to be synergistic for Cu(II) but antagonistic for Zn(II). In conclusion, ACB is an effective adsorbent for Zn(II) and Cu(II) removal from aqueous solution.