科研之友
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摘要
This article presents the data for the effect of adsorbent dose, initial metal concentration, solution pH, agitating rate, and temperature on the adsorption of nickel(II) on waste of acorn. Batch adsorption studies have been carried out. Adsorption equilibrium was approached within 30-60 min. The nature of the possible adsorbent and metal ion interactions were examined by the FTIR technique. The maximum nickel(II) adsorption is noted at pH 5.0. The experimental isotherm data were analyzed using the Langmuir, Freundlich, and Temkin equations. The equilibrium data fit well the Langmuir isotherm. The adsorption capacity (Q(o)) calculated from Langmuir isotherm was 9.42 mg g(-1) at initial pH of 5.0 at 60 degrees C. The adsorption of nickel(II) on waste of acorn increased from 7.68 to 9.1 mg g(-1) when temperature was increased from 25 to 60 degrees C at an initial concentration of 200 mg L(-1). The adsorption of nickel(II) ions increased with increasing temperature indicating endothermic nature of the adsorption process. Various thermodynamic parameters, such as Delta G degrees, Delta H degrees, and Delta S degrees have been calculated. The thermodynamics of nickel(II) ion onto waste of acorn system indicates spontaneous and endothermic nature of the process. The pseudo first and second-order kinetic models were used to describe the kinetic data, and the rate constants were evaluated. The experimental data were fitted by the second-order kinetic model, which indicates that chemical sorption is the rate limiting step, inside of mass transfer.
- 出版日期2010-10
