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Inhibition of nZVI reactivity by magnetite during the reductive degradation of 1,1,1-TCA in nZVI/magnetite suspension

Paper ID Volume ID Publish Year Pages File Format Full-Text
47440 46472 2010 8 PDF Available
Title
Inhibition of nZVI reactivity by magnetite during the reductive degradation of 1,1,1-TCA in nZVI/magnetite suspension
Abstract

We demonstrated that the reactivity of nano-sized zero-valent iron (nZVI) can be inhibited by magnetite for the reductive degradation of 1,1,1-trichloroethane (1,1,1-TCA) in nZVI/magnetite suspension under low content of nZVI. A remarkable reductive degradation of 1,1,1-TCA (0.289 h−1) was observed in nZVI (0.01 g/24 mL) suspension in 5 h, while no significant degradation was observed in nZVI (0.01 g)/magnetite (0.5 g) suspension in 80 h. The reductive dechlorination of 1,1,1-TCA in the nZVI/magnetite suspension started as the content of nZVI increased to 0.02 g. The slope of rate constant increase with respect to the nZVI content for nZVI suspension (17.67 g−1 h−1) was greater than that for nZVI/magnetite suspension (14.89 g−1 h−1) at the nZVI content between 0 and 0.1 g/24 mL. No significant difference in the inhibition of nZVI reactivity by magnetite was observed in the pH range of 6–9. Surface analyses using transmission electron microscopy and X-ray photoelectron spectroscopy revealed that the significant increase of Fe(II) on the magnetite surface was due to an electron transfer from nZVI on its surface resulting in the inhibition of nZVI reactivity for the reductive degradation of 1,1,1-TCA in the nZVI/magnetite suspension.

Keywords
Nano-sized zero-valent iron (nZVI); Magnetite; Reductive degradation; 1,1,1-Trichloroethane; nZVI inhibition
First Page Preview
Inhibition of nZVI reactivity by magnetite during the reductive degradation of 1,1,1-TCA in nZVI/magnetite suspension
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 96, Issues 1–2, 26 April 2010, Pages 10–17
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis