Kinetics of transformation of 1,1,1-trichloroethane by Fe(II) in cement slurries
Jung, B; Batchelor, B
HERO ID
644897
Reference Type
Journal Article
Year
2009
Language
English
PMID
| HERO ID | 644897 |
|---|---|
| In Press | No |
| Year | 2009 |
| Title | Kinetics of transformation of 1,1,1-trichloroethane by Fe(II) in cement slurries |
| Authors | Jung, B; Batchelor, B |
| Journal | Journal of Hazardous Materials |
| Volume | 163 |
| Issue | 2-3 |
| Page Numbers | 1315-1321 |
| Abstract | This study examines the applicability of the iron-based degradative solidification/stabilization (DS/S-Fe(II)) process to 1,1,1-trichloroethane (1,1,1-TCA), which is one of common chlorinated aliphatic hydrocarbons (CAHs) of concern at contaminated sites. DS/S-Fe(II) combines contaminant degradation by Fe(II) and immobilization by the hydration reactions of Portland cement. The transformation of 1,1,1-TCA by Fe(II) in 10% Portland cement slurries was studied using a batch slurry reactor system. The effects of Fe(II) dose, pH, and initial concentration of 1,1,1-TCA on the kinetics of 1,1,1-TCA degradation were evaluated. Degradation of 1,1,1-TCA in cement slurries including Fe(II) was very rapid and could be described by a pseudo-first-order rate law. The half-lives for 1,1,1-TCA were measured between 0.4 and 5h when Fe(II) dose ranged from 4.9 to 39.2mM. The pseudo-first-order rate constant increased with pH to a maximum near pH 12.5. A saturation rate equation was able to predict degradation kinetics over a wide range of target organic concentrations and at higher Fe(II) doses. The major transformation product of 1,1,1-TCA in mixtures of Fe(II) and cement was 1,1-dichloroethane (1,1-DCA), which indicates that degradation occurred by a hydrogenolysis pathway. A small amount of ethane was observed. The conversion of 1,1,1-TCA to ethane was better described by a parallel reaction model than by a consecutive reaction model. |
| Doi | 10.1016/j.jhazmat.2008.07.102 |
| Pmid | 18804328 |
| Wosid | WOS:000264160000112 |
| Url | https://search.proquest.com/docview/20353710?accountid=171501 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Language Text | English |
| Keyword | Ethane; Iron/ chemistry; Kinetics; Trichloroethanes/ chemistry |
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