59 Scopus citations

Abstract

Hybrid ion-exchange (HIX) media for simultaneous removal of arsenate and perchlorate were prepared by impregnation of non-crystalline iron (hydr)oxide nanoparticles onto strong base ion-exchange (IX) resins using two different chemical treatment techniques. In situ precipitation of Fe(III) (M treatment) resulted in the formation of sphere-like clusters of nanomaterials with diameters of ∼5 nm, while KMnO4/Fe(II) treatments yielded rod-like nanomaterials with diameters of 10-50 nm inside the pores of the media. The iron content of most HIX media was >10% of dry weight. The HIX media prepared via the M treatment method consistently exhibited greater arsenate adsorption capacity. The fitted Freundlich adsorption intensity parameters (q = K × CE1 / n) for arsenate (1/n < 0.6) indicated favorable adsorption trends. The K values ranged between 2.5 and 34.7 mgAs/g dry resin and were generally higher for the M treated media in comparison to the permanganate treated media. The separation factors for perchlorate over chloride (αC l-Cl O4-) for the HIX media were lower than its untreated counterparts. The HIX prepared via the M treatment, had higher αC l-Cl O4- than the HIX obtained by the KMnO4/Fe(II) treatments suggesting that permanganate may adversely impact the ion-exchange base media. Short bed adsorber (SBA) tests demonstrated that the mass transport kinetics for both ions are adequately rapid to permit simultaneous removal using HIX media in a fixed bed reactor.

Original languageEnglish (US)
Pages (from-to)397-406
Number of pages10
JournalJournal of Hazardous Materials
Volume152
Issue number1
DOIs
StatePublished - Mar 21 2008

    Fingerprint

Keywords

  • Arsenate
  • Hybrid ion exchange
  • Iron (hydr)oxide
  • Perchlorate
  • Removal
  • Water

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this