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  Silica-coated magnetite nanoparticles prepared by the one-step electrochemical method for dye removal  
Diupload oleh : Heru Setyawan
Pengarang : H. Setyawan, W. Widiyastuti, M. Mahmudi, M.D. Pusfitasari
Tahun : 2018
Dipublikasikan di : Journal of Powder Technology and Advanced Functional Materials, 1(1), 1-11
Jenis Jurnal : Jurnal Internasional
Eksternal Link : http://ojs.jpfoundation.or.id/index.php/jptafm/article/view/16
Bidang Penelitian : Nanoparticles
Abstrak : 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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