Effect of NaCl on Cr(VI) reduction by granular zero valent Iron (ZVI) in aqueous solutions

Hyangsig Ahn, Ho Young Jo, Geon Young Kim, Yong Kwon Koh

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

This study examined the effect of NaCl on the removal of Cr(VI) by ZVI in aqueous solutions and proposes a potential mechanism of Cr(VI) removal by ZVI in aqueous solutions with NaCl. A series of batch tests was conducted on ZVI using 100mg/L Cr(VI) solutions at an initial pH of 3 at various NaCl concentrations. The NaCl in aqueous solutions improved the removal efficiency for Cr(VI) by ZVI. Fe(III)Cr( III) (oxy)hydroxides were precipitated both on the ZVI surface and in the solution via the reduction reactions of Cr(VI) to Cr(III) in the presence of NaCl. The increase in the Cr(VI) removal efficiency in the solutions with NaCl was attributed to the Cl ions, which accumulate at the anodic sites of ZVI, thereby enhancing ZVI oxidation and colloidal particle formation. In the NaCl solutions, small grains were initially precipitated on the ZVI surface, via relatively fast reactions. The subsequent slowing of these reactions resulted in the precipitation of large grains on the ZVI surface and colloidal particles in the solutions.

Original languageEnglish
Pages (from-to)1324-1329
Number of pages6
JournalMaterials Transactions
Volume53
Issue number7
DOIs
Publication statusPublished - 2012 Oct 5

Fingerprint

Iron
aqueous solutions
iron
Hydroxides
chromium hexavalent ion
hydroxides
Ions
Oxidation
oxidation
ions

Keywords

  • Chromate
  • Colloidal particles
  • NaCl
  • Redox reactions
  • Zero valent iron

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Effect of NaCl on Cr(VI) reduction by granular zero valent Iron (ZVI) in aqueous solutions. / Ahn, Hyangsig; Jo, Ho Young; Kim, Geon Young; Koh, Yong Kwon.

In: Materials Transactions, Vol. 53, No. 7, 05.10.2012, p. 1324-1329.

Research output: Contribution to journalArticle

Ahn, Hyangsig ; Jo, Ho Young ; Kim, Geon Young ; Koh, Yong Kwon. / Effect of NaCl on Cr(VI) reduction by granular zero valent Iron (ZVI) in aqueous solutions. In: Materials Transactions. 2012 ; Vol. 53, No. 7. pp. 1324-1329.
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