Thermodynamic study of heavy metals adsorption on magnetite nanoparticles
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Date
2020-12
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Waste-water is one of the most common reason for water pollution, may come from domestic, agricultural, and industries. Adsorption is considered to be one of the most effective technology, widely used for waste-water treatment. In the present work,
magnetite nanoparticles were used for the removal of Cd(II) and Pb(II) metal ions from aqueous solutions at 4.2 pH and varying adsorbent amount. MNPs were synthesized by the co-precipitation method. To know the structural and magnetic properties, synthesized MNPs were characterized by XRD, FTIR, and VSM. Results of XRD and VSM revealed that the crystallite size of MNPs was 10.16nm and saturation magnetization was 56.42 emu/g. Adsorption experiment results showed that the capacity of MNPs is higher for Pb(II) ions. Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherm models were used to explain the adsorption phenomena for the removal of Cd(II) and Pb(II) metal ions. Results showed that the experimental data fitted very well for the Temkin isotherm model. With the help of these models thermodynamic parameters were determined, which revealed the nature of the process.