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 -