Silica Magnetite Adsorbent: Effect of Drying Temperature of Silica Sol Gel on Magnetite Core Structure


Creative Commons License
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

Article Metrics: (Click on the Metric tab below to see the detail)

Article Info
Published: 31-07-2018
Section: Research Articles
Fulltext PDF Tell your colleagues Email the author
Recently, magnetite was investigated as water purification adsorbent because it’s unique magnetic properties that improved the adsorption efficiency through desorption process. But magnetite oxidized into maghemite/hematite with the increase of temperature. This transformation should be avoided to maintain the magnetic properties of magnetite. In this research magnetite separated from iron sand by magnetic extraction then coated with silica via sol gel method. The effect of drying temperature in sol gel had change the magnetite core structure into maghemite and found no formation of hematite at 350⁰C. Silica coating proved had protected magnetite from transformation into hematite due to drying temperature until 350⁰C .


magnetite, coating silica, sol gel, adsorben, drying effect

  1. Choiril Azmiyawati  Orcid Scopus Sinta
    Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University Jl. Prof. Soedarto, SH., Tembalang, Semarang, Indonesia
  2. Endang Sawitri 
    Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University Jl. Prof. Soedarto, SH., Tembalang, Semarang, Indonesia
  3. Parsaoran Siahaan  Scopus Sinta
    Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University Jl. Prof. Soedarto, SH., Tembalang, Semarang, Indonesia
  1. Amyn S. Teja, Pei-Yoong Koh, Synthesis, properties, and applications of magnetic iron oxide nanoparticles, Progress in Crystal Growth and Characterization of Materials, 55, 1, (2009) 22-45
  2. Ritu D. Ambashta, Mika Sillanpää, Water purification using magnetic assistance: A review, Journal of Hazardous Materials, 180, 1, (2010) 38-49
  3. D. Harikishore Kumar Reddy, Yeoung-Sang Yun, Spinel ferrite magnetic adsorbents: Alternative future materials for water purification?, Coordination Chemistry Reviews, 315, (2016) 90-111
  4. Agus Yulianto, Satria Bijaksana, Waloejo Loeksmanto, Comparative Study on Magnetic Characterization of Iron Sand from Several Locations in Central Java, Indonesian Journal of Physics, 14, 2, (2003) 63-66
  5. Bilalodin, Sunardi, Muhtar Effendy, Analisis Kandungan Senyawa Kimia dan Uji Sifat Magnetik Pasir Besi Pantai Ambal, Jurnal Fisika Indonesia, 17, 50, (2013) 29-31
  6. Dedi Sufiandi, Konsentrasi Pasir Besi Titan Dari Pengotornya Dengan Cara Magnetik, Metalurgi Majalah Ilmu dan Teknologi, 26, 1, (2015) 15-20
  7. Cafer T. Yavuz, Arjun Prakash, J. T. Mayo, Vicki L. Colvin, Magnetic separations: From steel plants to biotechnology, Chemical Engineering Science, 64, 10, (2009) 2510-2521
  8. Fauziatul Fajaroh, Heru Setyawan, Adrian Nur, I. Wuled Lenggoro, Thermal stability of silica-coated magnetite nanoparticles prepared by an electrochemical method, Advanced Powder Technology, 24, 2, (2013) 507-511
  9. Rochelle M. Cornell, Udo Schwertmann, The Iron Oxides: Structure, Properties, Reactions, Occurrences and Uses, Wiley, 2006.
  10. Aránzazu del Campo, Tapas Sen, Jean-Paul Lellouche, Ian J. Bruce, Multifunctional magnetite and silica–magnetite nanoparticles: Synthesis, surface activation and applications in life sciences, Journal of Magnetism and Magnetic Materials, 293, 1, (2005) 33-40
  11. Enobong R. Essien, Oluyemi A. Olaniyi, Luqman A. Adams, Rafiu O. Shaibu, Sol-Gel-Derived Porous Silica: Economic Synthesis and Characterization, Journal of Minerals and Materials Characterization and Engineering, 11, 10, (2012) 976-981
  12. C. A. Milea, C. Bogatu, A. DuŢĂ, The Influence of Parameters in Silica Sol-Gel Process, Bulletin of the Transilvania University of Brasov, Series I: Engineering Sciences, 4, 1, (2011) 59-66
  13. Henny Dwi Bhakti, Mashuri, Pengaruh Ukuran Partikel Fe3O4 Dari Pasir Besi Sebagai Bahan Penyerap Radar Pada Frekuensi X-Band dan Ku-Band, in, Institut Teknologi Sepuluh Nopember, Surabaya, 2014.
  14. Xiaoli Zhao, Yali Shi, Thanh Wang, Yaqi Cai, Guibin Jiang, Preparation of silica-magnetite nanoparticle mixed hemimicelle sorbents for extraction of several typical phenolic compounds from environmental water samples, Journal of Chromatography A, 1188, 2, (2008) 140-147
  15. Samira Hozhabr Araghi, Mohammad H. Entezari, Mahmoud Chamsaz, Modification of mesoporous silica magnetite nanoparticles by 3-aminopropyltriethoxysilane for the removal of Cr(VI) from aqueous solution, Microporous and Mesoporous Materials, 218, (2015) 101-111
  16. Damien Faivre, Iron Oxides: From Nature to Applications, Wiley, 2016.
  17. N. Mahmed, O. Heczko, A. Lancok, S. P. Hannula, The magnetic and oxidation behavior of bare and silica-coated iron oxide nanoparticles synthesized by reverse co-precipitation of ferrous ion (Fe2+) in ambient atmosphere, Journal of Magnetism and Magnetic Materials, 353, (2014) 15-22