Use of cyclodextrin and calcium chloride for enhanced removal of mercury from soil

Xiaojiang Wang, Irfan Yolcubal, Weizi Wang, Janick Artiola, Raina Maier, Mark Brusseau

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The use of solutions containing carboxymethyl-β-cyclodextrin (CMCD) or CaCl2 for enhancing the removal of Hg from a sandy soil was investigated using batch and column experiments. The retention of Hg appeared to be controlled by specific adsorption reactions, which greatly constrained Hg removal when using water (KNO3 solution) to flush columns packed with contaminated soil. The results showed that the two reagents did enhance the removal of Hg from the soil. For example, 81% and 60% of Hg was recovered after 50 pore volumes of flushing with 50 mM CaCl2 and 2 mM CMCD, respectively, compared to 24% recovery for a 10 mM KNO3 solution. However, significant tailing and delayed recovery of Hg during the elution process occurred in the presence of all reagents, indicating that the removal of Hg from the soil was rate limited.

Original languageEnglish (US)
Pages (from-to)1888-1892
Number of pages5
JournalEnvironmental Toxicology and Chemistry
Volume23
Issue number8
DOIs
StatePublished - Aug 2004

Keywords

  • Calcium chloride
  • Cyclodextrin
  • Heavy metal
  • Mercury removal
  • Soil flushing agent

ASJC Scopus subject areas

  • Environmental Chemistry
  • Health, Toxicology and Mutagenesis

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