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Fabrication and Characterization of SiO2/(3-Aminopropyl)triethoxysilane-Coated Magnetite Nanoparticles for Lead(II) Removal from Aqueous Solution

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Abstract

A novel nano-adsorbent SiO2/(3-aminopropyl)triethoxysilane-coated magnetite nanoparticles was synthesized for the adsorption of lead ions from water samples. Its structure and magnetic characteristics were characterized, by FTIR, powder X-ray diffraction, scanning electron microscope (SEM), transmission electron microscope (TEM) and vibrating sample magnetometry (VSM). Amino-functionalized SiO2 coated Fe3O4 magnetite nano-adsorbent exhibited superparamagnetic behavior and strong magnetization at room temperature. The efficiency of the nano-adsorbent in separation of the metals was evaluated by adsorption technique. Kinetic data were analyzed using the pseudo-first-order and pseudo-second-order equations. The data fitted very well to the pseudo-second-order kinetic model.The linear Langmuir and Freundlich models were applied to describe equilibrium isotherms and Langmuir model fitted well. The monolayer adsorption capacity was found as 17.65 mg/g at pH 4.0. Thermodynamic parameters such as free energy change (ΔG°), enthalpy change (ΔH°) and entropy change (ΔS°) were also calculated. These parameters showed that the adsorption of Pb(II) onto nano-adsorbent was feasible, spontaneous and endothermic. The amino-functionalized SiO2 coated Fe3O4 magnetic nano-adsorbent shows high adsorption capability for metal ions from aqueous solutions via the chelation mechanisms. The Pb(II) loaded nano-adsorbent can be easily recovered from aqueous solution with magnetic separation and regenerated readily by acid treatment. The product of this work can be used as an effective and recyclable nano-adsorbent for the removal of metal ions in wastewater treatment.

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Acknowledgments

The authors are grateful to the Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, for the laboratory facilities.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400, UPM Serdang, Selangor, Malaysia

    Mahnaz Mahdavi, Mansor Bin Ahmad & Kamyar Shameli

  2. Department of Polymer Engineering, Islamic Azad University, Shiraz, Iran

    Mahnaz Mahdavi

  3. Centre of Foundation Studies for Agricultural Science, Universiti Putra Malaysia, 43400, UPM Serdang, Selangor, Malaysia

    Md Jelas Haron

  4. Department of Chemistry, Islamic Azad University, Behbahan Branch, Behbahan, Iran

    Yadollah Gharayebi

  5. Materials and Energy Research Center, 3177983634, Karaj, Iran

    Kamyar Shameli

  6. Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia (UKM), Bangi, Malaysia

    Behzad Nadi

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  1. Mahnaz Mahdavi
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  2. Mansor Bin Ahmad
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Correspondence to Mahnaz Mahdavi.

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Mahdavi, M., Ahmad, M.B., Haron, M.J. et al. Fabrication and Characterization of SiO2/(3-Aminopropyl)triethoxysilane-Coated Magnetite Nanoparticles for Lead(II) Removal from Aqueous Solution. J Inorg Organomet Polym 23, 599–607 (2013). https://doi.org/10.1007/s10904-013-9820-2

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  • DOI: https://doi.org/10.1007/s10904-013-9820-2

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