An XPS study for mechanisms of arsenate adsorption onto a magnetite-doped activated carbon fiber

Shujuan Zhang, Xiao yan Li, J. Paul Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

100 Scopus citations

Abstract

The surface and bulk structures of a newly developed carbon-based iron-containing adsorbent for As(V) adsorption were investigated by using X-ray diffraction (XRD), field emission scanning electronic microscopy (FESEM), and X-ray photoelectron spectroscopy (XPS). XRD patterns of the adsorbents indicated that the modified activated carbon fiber (MACF) was a simple mixture of the raw activated carbon fiber (RACF) and magnetite. After modification, a porous film was formed on the surface of the MACF with nano-sized magnetite on it. The As(V) uptake on the MACF was highly pH dependent and was facilitated in acidic solutions. XPS studies demonstrated that the surface oxygen-containing functional groups were involved in the adsorption and that magnetite played a key role in As(V) uptake. The dominance of HAsO42 - in surface complexes and the pH effect on As(V) uptake demonstrated that the monoprotonated bidentate complexes were dominant on the surface of the MACF. No reduction of As(V) was observed on the surface of the ACFs.

Original languageEnglish
Pages (from-to)232-238
Number of pages7
JournalJournal of Colloid and Interface Science
Volume343
Issue number1
DOIs
StatePublished - 1 Mar 2010
Externally publishedYes

Keywords

  • Activated carbon fiber (ACF)
  • Adsorption
  • Arsenate
  • Magnetite
  • X-ray photoelectron spectroscopy (XPS)

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