10.1007/s40097-017-0239-0

Synthesis, characterization, and application of nickel oxide/CNT nanocomposites to remove Pb2+ from aqueous solution

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  • T. Navaei Diva1,
  • K. Zare*1,
  • F. Taleshi2,
  • M. Yousefi1,
  1. Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, IR
  2. Department of Physics, Qaemshahr Branch, Islamic Azad University, Qaemshahr, IR
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Published in Issue 31-07-2017

How to Cite

Navaei Diva, T., Zare, K., Taleshi, F., & Yousefi, M. (2017). Synthesis, characterization, and application of nickel oxide/CNT nanocomposites to remove Pb2+ from aqueous solution. Journal of Nanostructure in Chemistry, 7(3 (September 2017). https://doi.org/10.1007/s40097-017-0239-0
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Abstract

Abstract In this study, the efficiency of nickel oxide/carbon nanotube (NiO/CNT) nanocomposite to remove Pb 2+ from aqueous solution is investigated. NiO/CNT nanocomposite was prepared using the direct coprecipitation method in an aqueous media in the presence of CNTs. Samples were characterized using simultaneous thermal analysis (STA), X-ray diffraction (XRD), filed emission scanning electron microscopy (FESEM), and Brunauer–Emmett–Teller (BET). To optimize the adsorption of Pb 2+ ions on NiO/CNT nanocomposite, the effects of different parameters including pH, contact time, initial concentration of Pb 2+ , and adsorbent mass—were also investigated. The optimum Pb 2+ removal efficiency on NiO/CNT nanocomposite is achieved under experimental conditions of pH 7, contact time of 10 min, initial Pb 2+ concentration of 20 ppm, and adsorbent mass of 0.1 g. The experimental data showed that the Pb 2+ ions adsorption of NiO/CNT nanocomposite was through a Freundlich isotherm model rather than a Langmuir model. The kinetic data of adsorption of Pb 2+ ions on the adsorbent was perfectly shown by a pseudo-second-order equation, to indicate their chemical adsorption. Thermodynamic parameters such as Δ G °, Δ H °, and Δ S ° were also measured; the obtained values showed that the adsorption was basically spontaneous and endothermic.

Keywords

  • Removal,
  • Adsorption,
  • Carbon nanotubes,
  • Composite,
  • Heavy metals
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