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Most of the models used in this work showed good representation of the adsorption isotherm when applied to individual metal ions

Predictions of binary sorption isotherms for the sorption of heavy metals by pine bark using single isotherm data.

Chemosphere, no. 5 (2000): 659-665

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摘要

The adsorption of three heavy metal ions by pine bark was studied. The study was divided into two parts; single component adsorption of the metals Cu2+, Cd2+ and Ni2+ and bisolute adsorption of the three binary systems Cu2+-Cd2+, Cu2+-Ni2+ and Cd2+-Ni2+. Extended Langmuir model, extended Freundlich model. Sips model and ideal adsorption s...更多

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简介
  • Adsorption is an e€ective puri®cation and separation technique used in industry especially in water and wastewater treatments.
  • Cadmium is irritant to the respiratory tract
  • Prolonged exposure to this metal can cause anosmia and alloy stains that gradually appear on the necks of the teeth and copper may cause keratinization of the hands and soles of the feet (Sitting, 1981).
  • There are many methods for the removal of metal ions from solutions, such as chemical precipitation, complexation, solvent extraction and membrane processes (Patterson and Minear, 1975), adsorption processes showed many advantages over these methods.
  • E€ective and is able to remove very low levels of heavy metals from solutions
重点内容
  • Adsorption is an e€ective puri®cation and separation technique used in industry especially in water and wastewater treatments
  • The experimental data of the single-metal sorption isotherms for Cu2‡, Cd2‡ and Ni2‡ are shown in Figs. 1± 3. These results indicate that an increase in the metal ions concentration resulted in an increase in the amount of the ions adsorbed
  • The same ®gures show the individual metal isotherms represented by the Langmuir, Freundlich and Sips models
  • The Package SCIENTIST was used to evaluate the parameters for these models, using the experimental data for each of the three metal ions, by the non-linear least square regression (Table 1)
  • Most of the models used in this work showed good representation of the adsorption isotherm when applied to individual metal ions
  • Freundlich satisfactory predicted the equilibrium data when applied to the binary systems Cu2‡)Cd2‡, Cu2‡)Ni2‡ and Cd2‡)Ni2‡
结果
  • Results and discussion

    The experimental data of the single-metal sorption isotherms for Cu2‡, Cd2‡ and Ni2‡ are shown in Figs. 1± 3.
  • The Package SCIENTIST was used to evaluate the parameters for these models, using the experimental data for each of the three metal ions, by the non-linear least square regression (Table 1).
  • The values of R2, which is a measure of the goodness-of-®t, con®rm the good representation of the experimental data by these models
结论
  • The validity of a single and a single-based multicomponent adsorption isotherm models in the prediction of single and binary combination of the heavy metals Cu2‡, Cd2‡ and Ni2‡ adsorption was assessed.
  • Most of the models used in this work showed good representation of the adsorption isotherm when applied to individual metal ions.
  • Freundlich satisfactory predicted the equilibrium data when applied to the binary systems Cu2‡)Cd2‡, Cu2‡)Ni2‡ and Cd2‡)Ni2‡.
  • Whereas the Sips model poorly predicted the equilibrium data of these systems.
  • When suitable multicomponent adsorption isotherm models is selected, single isotherm data can be used to predict binary equilibrium data
表格
  • Table1: Model isotherm parameters for the single metal adsorption systems
Download tables as Excel
引用论文
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