Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 26, Issue 5, Pages 1162-1170Publisher
SCIENCE PRESS
DOI: 10.1016/S1001-0742(13)60506-9
Keywords
nanoscale Ni-Fe; trichloroethylene; hydrodechlorination; catalytic dechlorination; composition; environmental parameters
Categories
Funding
- National Natural Science Foundation of China [20807004]
- General Research an Development Founding for Universities directly under the Ministry of Education of China [BUCT-ZZ1202]
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Catalytic nickel was successfully incorporated into nanoscale iron to enhance its dechlorination efficiency for trichloroethylene (TCE), one of the most commonly detected chlorinated organic compounds in groundwater Ethane was the predominant product. The greatest dechlorination efficiency was achieved at 22 molar percent of nickel. This nanoscale Ni-Fe is poorly ordered and inhomogeneous; iron dissolution occurred whereas nickel was relatively stable during the 24-hr reaction. The morphological characterization provided significant new insights on the mechanism of catalytic hydrodechlorination by bimetallic nanoparticles. TCE degradation and ethane production rates were greatly affected by environmental parameters such as solution pH, temperature and common groundwater ions. Both rate constants decreased and then increased over the pH range of 6.5 to 8.0, with the minimum value occurring at pH 7.5. TCE degradation rate constant showed an increasing trend over the temperature range of 10 to 25 degrees C. However, ethane production rate constant increased and then decreased over the range, with the maximum value occurring at 20 degrees C. Most salts in the solution appeared to enhance the reaction in the first half hour but overall they displayed an inhibitory effect. Combined ions showed a similar effect as individual salts.
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