TY - GEN
T1 - Reductive transformation of carbon tetrachloride by sulfide-treated goethite
AU - Shao, Hongbo
AU - Butler, Elizabeth C.
PY - 2006
Y1 - 2006
N2 - In natural environments, many reductants contribute to the reductive transformation of chlorinated aliphatic hydrocarbons (CAHs). To effectively apply monitored natural attenuation in the remediation of CAH-contaminated aquifers, the identification of the predominant species that determine the reaction rate and the parameters that control the product distribution is needed. In this research, sulfide (S(-II))-treated goethite was used to simulate sulfate-reducing iron oxide-rich environments and the reductive dechlorination of carbon tetrachloride (CT) was studied. By changing pH and added Fe(II) and, by aging, the abundance of different reductants in S(-II)-treated goethite was changed in order to correlate the concentration of the different reductants with CT reduction rates. Experimental results indicated that weakly bound Fe(II) is the most reactive species in the electron transfer from surface to CT. Formate, CS2, CO and chloroform were identified as CT transformation products in S(-II)-treated goethite. A chlorine balance showed that the unidentified products were completely dechlorinated.
AB - In natural environments, many reductants contribute to the reductive transformation of chlorinated aliphatic hydrocarbons (CAHs). To effectively apply monitored natural attenuation in the remediation of CAH-contaminated aquifers, the identification of the predominant species that determine the reaction rate and the parameters that control the product distribution is needed. In this research, sulfide (S(-II))-treated goethite was used to simulate sulfate-reducing iron oxide-rich environments and the reductive dechlorination of carbon tetrachloride (CT) was studied. By changing pH and added Fe(II) and, by aging, the abundance of different reductants in S(-II)-treated goethite was changed in order to correlate the concentration of the different reductants with CT reduction rates. Experimental results indicated that weakly bound Fe(II) is the most reactive species in the electron transfer from surface to CT. Formate, CS2, CO and chloroform were identified as CT transformation products in S(-II)-treated goethite. A chlorine balance showed that the unidentified products were completely dechlorinated.
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M3 - Conference contribution
AN - SCOPUS:34047250652
SN - 0841274266
SN - 9780841274266
T3 - ACS National Meeting Book of Abstracts
BT - Abstracts of Papers - 232nd American Chemical Society Meeting and Exposition
T2 - 232nd American Chemical Society Meeting and Exposition
Y2 - 10 September 2006 through 14 September 2006
ER -