Synthesis of mesoporous magnetic γ-Fe2O3 and its application to Cr(VI) removal from contaminated water

Peng Wang, Irene M.C. Lo*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

251 Scopus citations


In this study, mesoporous magnetic iron-oxide (γ-Fe2O3) was synthesized as an adsorbent for Cr(VI) removal. For material synthesis, mesoporous silica (KIT-6) was used as a hard template and to drive iron precursor into KIT-6, a 'greener', affinity based impregnation method was employed, which involved using a nonpolar solvent (xylene) and led to recycling of the solvent. The results of Cr(VI) removal experiments showed that the synthesized mesoporous γ-Fe2O3 has a Cr(VI) adsorption capacity comparable with 10 nm nonporous γ-Fe2O3 but simultaneously has a much faster separation than 10 nm nonporous γ-Fe2O3 in the presence of an external magnetic field under the same experimental conditions. Cr(VI) adsorption capacity onto the mesoporous γ-Fe2O3 increased with decreasing solution pH and could be readily regenerated. Therefore, mesoporous γ-Fe2O3 presents a reusable adsorbent for a fast, convenient, and highly efficient removal of Cr(VI) from contaminated water.

Original languageEnglish (US)
Pages (from-to)3727-3734
Number of pages8
JournalWater research
Issue number15
StatePublished - Aug 2009
Externally publishedYes

Bibliographical note

Funding Information:
This research was supported by the Hong Kong University of Science and Technology Research Project Competition Program under grant RPC07/08.EG03.


  • Adsorption
  • Chromium
  • Magnetic separation
  • Mesoporous iron-oxide

ASJC Scopus subject areas

  • Water Science and Technology
  • Ecological Modeling
  • Pollution
  • Waste Management and Disposal
  • Environmental Engineering
  • Civil and Structural Engineering


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