Carbon disulfide removal by zero valent iron

R. Kalin, K.L. McGeough, P. Myles

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The use of zero valent iron (Fe-0) for the remediation of water contaminated with carbon disulfide (CS2), a common groundwater contaminant, has been evaluated in this study. Mineralogical analysis of Fe-0 filings and polished Fe-0 cross-sections indicates that iron sulfide is formed due to the removal of carbon disulfide from solution by Fe-0. The kinetics of CS2 removal by Fe-0 was examined through both batch and column testing, and it is demonstrated that CS2 is removed rapidly from solution. A linear relationship was observed, through batch testing, between the pseudofirst-order rate constant (k(obs)) and the surface area concentration of Fe-0 (rho a). Data obtained from kinetic batch tests performed at four temperature levels conformed to the Arrhenius equation, anc the calculated apparent activation energy (E-a) was 37 +/- 2.3 kJ mol(-1), indicating that the kinetics of CS2 removal by Fe-0 is controlled by a chemical surface reaction. The temperature correction factors for CS2 from a reference of 25 degrees C were x 1.4 for 18 degrees C, x 1.7 for 15 degrees C, x 2.0 for 12 degrees C, and x 2.3 for 9 degrees C. Surface area normalization of kob, obtained through batch and column testing gives specific reaction rate constants (k(SA)) within 1 order of magnitude, indicating that kSA values are useful as a general descriptor of CS2-Fe-0 reaction kinetics and that these values provide a clear starting point for design calculations prior to commencing site-specific treatability studies for permeable reactive barrier design.
LanguageEnglish
Pages4607-4612
Number of pages5
JournalEnvironmental Science and Technology
Volume41
Issue number13
DOIs
Publication statusPublished - 2007

Fingerprint

Carbon Disulfide
Iron
iron
kinetics
Kinetics
Rate constants
carbon
Testing
surface area
reactive barrier
iron sulfide
Surface reactions
Sulfides
reaction kinetics
Remediation
Reaction kinetics
activation energy
reaction rate
Reaction rates
Groundwater

Keywords

  • reductive dehalogenation
  • zerovalent iron
  • mineralogical characteristics
  • reactive barrier
  • kinetics
  • degradation
  • trichloroethylene
  • dechlorination
  • sulfide
  • metal

Cite this

Kalin, R. ; McGeough, K.L. ; Myles, P. / Carbon disulfide removal by zero valent iron. In: Environmental Science and Technology. 2007 ; Vol. 41, No. 13. pp. 4607-4612.
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Carbon disulfide removal by zero valent iron. / Kalin, R.; McGeough, K.L.; Myles, P.

In: Environmental Science and Technology, Vol. 41, No. 13, 2007, p. 4607-4612.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Carbon disulfide removal by zero valent iron

AU - Kalin, R.

AU - McGeough, K.L.

AU - Myles, P.

PY - 2007

Y1 - 2007

N2 - The use of zero valent iron (Fe-0) for the remediation of water contaminated with carbon disulfide (CS2), a common groundwater contaminant, has been evaluated in this study. Mineralogical analysis of Fe-0 filings and polished Fe-0 cross-sections indicates that iron sulfide is formed due to the removal of carbon disulfide from solution by Fe-0. The kinetics of CS2 removal by Fe-0 was examined through both batch and column testing, and it is demonstrated that CS2 is removed rapidly from solution. A linear relationship was observed, through batch testing, between the pseudofirst-order rate constant (k(obs)) and the surface area concentration of Fe-0 (rho a). Data obtained from kinetic batch tests performed at four temperature levels conformed to the Arrhenius equation, anc the calculated apparent activation energy (E-a) was 37 +/- 2.3 kJ mol(-1), indicating that the kinetics of CS2 removal by Fe-0 is controlled by a chemical surface reaction. The temperature correction factors for CS2 from a reference of 25 degrees C were x 1.4 for 18 degrees C, x 1.7 for 15 degrees C, x 2.0 for 12 degrees C, and x 2.3 for 9 degrees C. Surface area normalization of kob, obtained through batch and column testing gives specific reaction rate constants (k(SA)) within 1 order of magnitude, indicating that kSA values are useful as a general descriptor of CS2-Fe-0 reaction kinetics and that these values provide a clear starting point for design calculations prior to commencing site-specific treatability studies for permeable reactive barrier design.

AB - The use of zero valent iron (Fe-0) for the remediation of water contaminated with carbon disulfide (CS2), a common groundwater contaminant, has been evaluated in this study. Mineralogical analysis of Fe-0 filings and polished Fe-0 cross-sections indicates that iron sulfide is formed due to the removal of carbon disulfide from solution by Fe-0. The kinetics of CS2 removal by Fe-0 was examined through both batch and column testing, and it is demonstrated that CS2 is removed rapidly from solution. A linear relationship was observed, through batch testing, between the pseudofirst-order rate constant (k(obs)) and the surface area concentration of Fe-0 (rho a). Data obtained from kinetic batch tests performed at four temperature levels conformed to the Arrhenius equation, anc the calculated apparent activation energy (E-a) was 37 +/- 2.3 kJ mol(-1), indicating that the kinetics of CS2 removal by Fe-0 is controlled by a chemical surface reaction. The temperature correction factors for CS2 from a reference of 25 degrees C were x 1.4 for 18 degrees C, x 1.7 for 15 degrees C, x 2.0 for 12 degrees C, and x 2.3 for 9 degrees C. Surface area normalization of kob, obtained through batch and column testing gives specific reaction rate constants (k(SA)) within 1 order of magnitude, indicating that kSA values are useful as a general descriptor of CS2-Fe-0 reaction kinetics and that these values provide a clear starting point for design calculations prior to commencing site-specific treatability studies for permeable reactive barrier design.

KW - reductive dehalogenation

KW - zerovalent iron

KW - mineralogical characteristics

KW - reactive barrier

KW - kinetics

KW - degradation

KW - trichloroethylene

KW - dechlorination

KW - sulfide

KW - metal

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DO - 10.1021/es062936z

M3 - Article

VL - 41

SP - 4607

EP - 4612

JO - Environmental Science and Technology

T2 - Environmental Science and Technology

JF - Environmental Science and Technology

SN - 0013-936X

IS - 13

ER -