Efficient dechlorination of carbon tetrachloride by hydrophobic green rust intercalated with dodecanoate anions

Karina Barbara Ayala Luis; Nicola Ginette Anneliese Cooper; Christian Bender Koch; Hans Chr. Bruun Hansen

doi:10.1021/es204368u

Efficient dechlorination of carbon tetrachloride by hydrophobic green rust intercalated with dodecanoate anions

Karina Barbara Ayala Luis, Nicola Ginette Anneliese Cooper, Christian Bender Koch, Hans Chr. Bruun Hansen

26 Citationer (Scopus)

Abstract

The reductive dechlorination of carbon tetrachloride (CT) by Fe-II-Fe-III hydroxide (green rust) intercalated with dodecanoate, (Fe4Fe2III)-Fe-II (OH)(12)(C12H23O2)(2)center dot gamma H2O (designated GR(C12)), at pH similar to 8 and at room temperature was investigated. CT at concentration levels similar to those found in heavily contaminated groundwater close to polluted industrial sites (14 988 mu M) was reduced mainly to the fully dechlorinated products carbon monoxide (CO, yields >54 and formic acid (HCOOH, yields >6. Minor formation of chloroform (CF), the only chlorinated degradation product, was also detected (yields

Originalsprog	Engelsk
Tidsskrift	Environmental Science & Technology (Washington)
Vol/bind	46
Udgave nummer	6
Sider (fra-til)	3390-3397
Antal sider	8
ISSN	0013-936X
DOI	https://doi.org/10.1021/es204368u
Status	Udgivet - 20 mar. 2012

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10.1021/es204368u

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Efficient dechlorination of carbon tetrachloride by hydrophobic green rust intercalated with dodecanoate anions. / Ayala Luis, Karina Barbara; Ginette Anneliese Cooper, Nicola; Bender Koch, Christian et al.

I: Environmental Science & Technology (Washington), Bind 46, Nr. 6, 20.03.2012, s. 3390-3397.

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review

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title = "Efficient dechlorination of carbon tetrachloride by hydrophobic green rust intercalated with dodecanoate anions",

abstract = "The reductive dechlorination of carbon tetrachloride (CT) by Fe II-FeIII hydroxide (green rust) intercalated with dodecanoate, FeII4FeIII2(OH) 12(C12H23O2)2· yH2O (designated GRC12), at pH ∼ 8 and at room temperature was investigated. CT at concentration levels similar to those found in heavily contaminated groundwater close to polluted industrial sites (14-988 μM) was reduced mainly to the fully dechlorinated products carbon monoxide (CO, yields >54%) and formic acid (HCOOH, yields >6%). Minor formation of chloroform (CF), the only chlorinated degradation product, was also detected (yields <6.3%). Reactions carried out with excess GR followed pseudo first-order kinetics with respect to CT with rate constants ranging from 6.5 × 10-2 to 0.47 h-1. These rate constants are comparable to those measured for CT dechlorinations mediated by zerovalent iron. Reduction of the highest concentration of CT (1.4 mM) proceeds until 56% of the FeII sites of GRC12 was consumed. This reaction ceased after 10 h due to surface passivation of GRC12.",

author = "{Ayala Luis}, {Karina Barbara} and {Ginette Anneliese Cooper}, Nicola and {Bender Koch}, Christian and Hansen, {Hans Chr. Bruun}",

year = "2012",

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TY - JOUR

T1 - Efficient dechlorination of carbon tetrachloride by hydrophobic green rust intercalated with dodecanoate anions

AU - Ayala Luis, Karina Barbara

AU - Ginette Anneliese Cooper, Nicola

AU - Bender Koch, Christian

AU - Hansen, Hans Chr. Bruun

PY - 2012/3/20

Y1 - 2012/3/20

N2 - The reductive dechlorination of carbon tetrachloride (CT) by Fe II-FeIII hydroxide (green rust) intercalated with dodecanoate, FeII4FeIII2(OH) 12(C12H23O2)2· yH2O (designated GRC12), at pH ∼ 8 and at room temperature was investigated. CT at concentration levels similar to those found in heavily contaminated groundwater close to polluted industrial sites (14-988 μM) was reduced mainly to the fully dechlorinated products carbon monoxide (CO, yields >54%) and formic acid (HCOOH, yields >6%). Minor formation of chloroform (CF), the only chlorinated degradation product, was also detected (yields <6.3%). Reactions carried out with excess GR followed pseudo first-order kinetics with respect to CT with rate constants ranging from 6.5 × 10-2 to 0.47 h-1. These rate constants are comparable to those measured for CT dechlorinations mediated by zerovalent iron. Reduction of the highest concentration of CT (1.4 mM) proceeds until 56% of the FeII sites of GRC12 was consumed. This reaction ceased after 10 h due to surface passivation of GRC12.

AB - The reductive dechlorination of carbon tetrachloride (CT) by Fe II-FeIII hydroxide (green rust) intercalated with dodecanoate, FeII4FeIII2(OH) 12(C12H23O2)2· yH2O (designated GRC12), at pH ∼ 8 and at room temperature was investigated. CT at concentration levels similar to those found in heavily contaminated groundwater close to polluted industrial sites (14-988 μM) was reduced mainly to the fully dechlorinated products carbon monoxide (CO, yields >54%) and formic acid (HCOOH, yields >6%). Minor formation of chloroform (CF), the only chlorinated degradation product, was also detected (yields <6.3%). Reactions carried out with excess GR followed pseudo first-order kinetics with respect to CT with rate constants ranging from 6.5 × 10-2 to 0.47 h-1. These rate constants are comparable to those measured for CT dechlorinations mediated by zerovalent iron. Reduction of the highest concentration of CT (1.4 mM) proceeds until 56% of the FeII sites of GRC12 was consumed. This reaction ceased after 10 h due to surface passivation of GRC12.

U2 - 10.1021/es204368u

DO - 10.1021/es204368u

M3 - Journal article

C2 - 22360442

SN - 0013-936X

VL - 46

SP - 3390

EP - 3397

JO - Environmental Science & Technology

JF - Environmental Science & Technology

IS - 6

ER -

Efficient dechlorination of carbon tetrachloride by hydrophobic green rust intercalated with dodecanoate anions

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