Water, Air, and Soil Pollution

, Volume 197, Issue 1, pp 49–60

Reduction of Hexavalent Chromium in Soil and Ground Water Using Zero-Valent Iron Under Batch and Semi-Batch Conditions

  • Débora V. Franco
  • Leonardo M. Da Silva
  • Wilson F. Jardim
Article

DOI: 10.1007/s11270-008-9790-0

Cite this article as:
Franco, D.V., Da Silva, L.M. & Jardim, W.F. Water Air Soil Pollut (2009) 197: 49. doi:10.1007/s11270-008-9790-0

Abstract

Chemical remediation of soil and groundwater containing hexavalent chromium (Cr(VI)) was carried out under batch and semi-batch conditions using different iron species: (Fe(II) (sulphate solution); Fe0G (granulated elemental iron); ZVIne (non-stabilized zerovalent iron) and ZVIcol (colloidal zerovalent iron). ZVIcol was synthesized using different experimental conditions with carboxymethyl cellulose (CMC) and ultra-sound. Chemical analysis revealed that the contaminated soil (frank clay sandy texture) presented an average Cr(VI) concentration of 456 ± 35 mg kg−1. Remediation studies carried out under batch conditions indicated that 1.00 g of ZVIcol leads to a chemical reduction of ∼280 mg of Cr(VI). Considering the fractions of Cr(VI) present in soil (labile, exchangeable and insoluble), it was noted that after treatment with ZVIcol (semi-batch conditions and pH 5) only 2.5% of these species were not reduced. A comparative study using iron species was carried out in order to evaluate the reduction potentialities exhibited by ZVIcol. Results obtained under batch and semi-batch conditions indicate that application of ZVIcol for the “in situ” remediation of soil and groundwater containing Cr(VI) constitutes a promising technology.

Keywords

Contaminated soilHexavalent chromiumCarboxymethyl celluloseColloidal zerovalent ironChromium immobilization

Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Débora V. Franco
    • 1
  • Leonardo M. Da Silva
    • 2
  • Wilson F. Jardim
    • 1
  1. 1.Institute of ChemistryLQA—UNICAMPCampinasBrazil
  2. 2.Department of ChemistryFACESA—UFVJMDiamantinaBrazil