Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
582415 | Journal of Hazardous Materials | 2009 | 8 Pages |
Abstract
Reductive dechlorination of carbon tetrachloride (CT) and 1,1,1-trichloroethane (1,1,1-TCA) by FeS with transition metals (Cu(II), Co(II), and Ni(II)) and hydrosulfide was characterized in this study. The batch kinetic experiments were conducted by spiking each stock solution of CT and 1,1,1-TCA into 33Â g/L of FeS suspensions with and without transition metals at pH 7.5. No significant enhancement was observed in the reductive dechlorination of target compounds by FeS with 1Â mM transition metals. However, except the addition of Cu(II), the reduction rate of 1,1,1-TCA increased with increasing the concentration of transition metals. The rate constants with 10Â mM Co(II) and Ni(II) were 0.06 and 0.11Â hâ1, approximately 1.3 and 3.0 times greater than those by FeS alone. The addition of 20Â mM HSâ also increased the rate constants of 1,1,1-TCA by FeS by one order of magnitude. SEM analysis showed that the addition of transition metal (Ni(II)) and HSâ caused a noticeable morphologic change of FeS surface. The transition metal added was substituted by the structural iron resulting in the decrease of iron content of FeS (52.6-46.9%). One third of the transition metal in FeS suspension existed as zero-valent form playing a catalyst role to accelerate the reaction kinetics.
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Authors
Jeongyun Choi, Kyunghoon Choi, Woojin Lee,