Removal of Cr(VI) by magnetite nanoparticle

J. Hu, I. M.C. Lo, Guohua Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

216 Citations (Scopus)


Magnetite nanoparticles were synthesized by sol-gel method. The highly crystalline nature of the magnetite structure with diameter of around 10 nm was characterized with transmission electron microscopy and X-ray diffractometry. The surface area was determined to be 198 m2/g. Batch experiments were carried out to determine the adsorption kinetics and mechanism of Cr(VI) by these magnetite nanoparticles. The Cr(VI) uptake was mainly governed by physico-chemical adsorption. The adsorption process was found to be pH and temperature dependent. The adsorption data fit well with the Freundlich isotherm equation. The Freundlich constants were calculated at different temperatures. The adsorption capacity increased with rising temperature. Preliminary results indicate that magnetite nanoparticles may be used as an adsorbent for removal of Cr(VI) from wastewater.
Original languageEnglish
Pages (from-to)139-146
Number of pages8
JournalWater Science and Technology
Issue number12
Publication statusPublished - 1 Dec 2004
Externally publishedYes


  • Adsorption
  • Freundlich
  • Heavy metals
  • Magnetite
  • Zeta-potential

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology


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