Open AccessHome / Archives / Vol. 1 No. 1 (2018): JPTAFM Volume 1 Issue 1 (2018) / Articles Silica-coated magnetite nanoparticles prepared by the one-step electrochemical method for dye removal
Author(s) -
Heru Setyawan,
W. Widiyastuti,
Mahmudi Mahmud,
Memik Dian Pusfitasari
Publication year - 2018
Publication title -
journal of powder technology and advanced functional materials
Language(s) - English
Resource type - Journals
eISSN - 2621-7821
pISSN - 2621-573X
DOI - 10.29253/jptafm.v1i1.1
Subject(s) - methylene blue , magnetite , magnetite nanoparticles , adsorption , superparamagnetism , spinel , nanoparticle , materials science , aqueous solution , electrochemistry , nuclear chemistry , sodium silicate , silicate , chemical engineering , magnetic nanoparticles , inorganic chemistry , chemistry , nanotechnology , electrode , organic chemistry , metallurgy , catalysis , magnetization , physics , photocatalysis , quantum mechanics , magnetic field , engineering
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.