Science and Engineering of Composite Materials (Mar 2018)

Adsorption removal of methylene blue from aqueous solution on carbon-coated Fe3O4 microspheres functionalized with chloroacetic acid

  • Zhang Zefei,
  • Kim Cholhwan,
  • Fernandez Carlos,
  • Sundaram Manickam Minakshi,
  • Ramakrishnappa Thippeswamy,
  • Wang Yuhong,
  • Wang Linshan,
  • Sun Ting,
  • Hu Xiaomin

DOI
https://doi.org/10.1515/secm-2016-0138
Journal volume & issue
Vol. 25, no. 2
pp. 353 – 361

Abstract

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We report the preparation and employability of carbon-coated Fe3O4 (Fe3O4/C) microspheres functionalized with chloroacetic acid (CAA) for the removal of methylene blue (MB) in aqueous solution. The prepared magnetic microspheres (Fe3O4/C-CAA) were characterized by the following techniques: X-ray diffraction, transmission electron microscopy, Fourier-transform infrared spectrometer, vibrating sample magnetometry, and Brunauer-Emmett-Teller. The characterization results showed that Fe3O4/C microspheres were modified by CAA without any phase change. Fe3O4/C-CAA microspheres have higher adsorption capacity for MB compared to Fe3O4/C microspheres. The Langmuir, Freundlich, and Temkin adsorption models were applied to describe the equilibrium isotherms, and the Langmuir adsorption model fitted well with the equilibrium data. The pseudo-first-order and pseudo-second-order kinetic models were used to describe the kinetics data. However, the pseudo-second-order kinetic model fitted better with the adsorption kinetics data.

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