Adsorption mechanism of arsenate on crystal γ-Fe2O3Nanoparticles

T. Tuutijärvi, J. Lu, M. Sillanpää, Guohua Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

33 Citations (Scopus)

Abstract

Toxic arsenic occurs in drinking water from natural and/or anthropogenic sources. It causes health problems worldwide. Among the existing arsenic removal techniques adsorption is the commonly used one. γ -Fe2O3nanoparticles were found recently to be a good adsorbent for arsenate because of its relatively high adsorption capacity and simple separation of the particles from the treated water. The aim of the study was to investigate the arsenate adsorption mechanism on the crystal γ -Fe2O3nanoparticles. Adsorption experiments were carried out with three different kinds of maghemite nanoparticles: (i) homemade one with mechanochemical method; (ii) homemade one with sol-gel process; and (iii) a commercially available one. The adsorption process was monitored by characterizing with Fourier transform infrared, x-ray photoelectron spectroscopy, x-ray diffraction, transmission electron microscopy, and zeta potential analyzer. No crystal and amorphous precipitation were found on the iron oxide surfaces. The inner-sphere complex formation was found to be the predominant mechanism of adsorption.
Original languageEnglish
Pages (from-to)897-905
Number of pages9
JournalJournal of Environmental Engineering
Volume136
Issue number9
DOIs
Publication statusPublished - 1 Sep 2010
Externally publishedYes

Keywords

  • Adsorption
  • Adsorption mechanism
  • Arsenate
  • Arsenic
  • Drinking water
  • Inner-sphere complex
  • Maghemite
  • Nanoparticle
  • Nanotechnology
  • Particles
  • Water pollution

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Civil and Structural Engineering
  • Environmental Science(all)

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