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

doi:10.1897/03-379

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 journal › Article › peer-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 language	English (US)
Pages (from-to)	1888-1892
Number of pages	5
Journal	Environmental Toxicology and Chemistry
Volume	23
Issue number	8
DOIs	https://doi.org/10.1897/03-379
State	Published - 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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10.1897/03-379

Cite this

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title = "Use of cyclodextrin and calcium chloride for enhanced removal of mercury from soil",

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.",

keywords = "Calcium chloride, Cyclodextrin, Heavy metal, Mercury removal, Soil flushing agent",

author = "Xiaojiang Wang and Irfan Yolcubal and Weizi Wang and Janick Artiola and Raina Maier and Mark Brusseau",

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AU - Wang, Xiaojiang

AU - Yolcubal, Irfan

AU - Wang, Weizi

AU - Artiola, Janick

AU - Maier, Raina

AU - Brusseau, Mark

PY - 2004/8

Y1 - 2004/8

N2 - 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.

AB - 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.

KW - Calcium chloride

KW - Cyclodextrin

KW - Heavy metal

KW - Mercury removal

KW - Soil flushing agent

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

Abstract

Keywords

ASJC Scopus subject areas

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