Silica-coated magnetite nanoparticles prepared by the one-step electrochemical method for dye removal

  • Heru Setyawan Department of Chemical Engineering, Faculty of Industrial Technology, Institut Teknologi Sepuluh Nopember (ITS), Indonesia
  • W. Widiyastuti Department of Chemical Engineering, Faculty of Industrial Technology, Institut Teknologi Sepuluh Nopember (ITS), Indonesia
  • M Mahmudi Department of Chemical Engineering, Faculty of Industrial Technology, Institut Teknologi Sepuluh Nopember (ITS), Indonesia
  • Memik Dian Pusfitasari Department of Chemical Engineering, Institut Teknologi Kalimantan, Indonesia


In this paper, the synthesis of silica-coated magnetite nanoparticles using a one-step electrochemical method and their application for dye removal are presented. In this method, pure iron in a dilute aqueous sodium silicate solution that served as a silica precursor was electro-oxidized. The silica-coated magnetite nanoparticles produced by this method is nearly spherical with the size of approximately 10 nm and follows the spinel structure of Fe3O4. The silica-coated magnetite nanoparticles exhibit nearly superparamagnetic properties and excellent performance to remove methylene blue from wastewater. The adsorption capacity of the nanoparticles was approximately 24.2 mg methylene blue/g adsorbent, which was much higher than that of pure magnetite nanoparticles (1.1 mg methylene blue/g adsorbent). Also, the percentage removal was higher than 90% with the initial concentration of methylene blue up to 40 mg/L. It can be regenerated and reused with an only slight reduction in percentage removal.


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How to Cite
SETYAWAN, Heru et al. Silica-coated magnetite nanoparticles prepared by the one-step electrochemical method for dye removal. Journal of Powder Technology and Advanced Functional Materials, [S.l.], v. 1, n. 1, p. 1-11, july 2018. ISSN 2621-573X. Available at: <>. Date accessed: 25 june 2019. doi: