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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 12, No. 11, 2015, pp. 3489-3498
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Bioline Code: st15327
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 12, No. 11, 2015, pp. 3489-3498
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Decomposition of gas-phase chloroform using nanophotocatalyst downstream the novel non-thermal plasma reactor: by-products elimination
Ghorbani Shahna, F.; Ebrahimi, H.; Jaleh, B. & Bahrami, A.
Abstract
Combination the non-thermal plasma technique
by photocatalytic oxidation can enhance volatile
organic compounds degradation. In this study, the
decomposition of chloroform vapors in a novel non-thermal
plasma reactor as well as an integrated system of this
reactor in conjunction with the photocatalysis process was
investigated. Expanded graphite was used as discharge
electrode of dielectric barrier discharge reactor and the
support of TiO2 and ZnO catalysts as well. Results showed
that chloroform degradation increased in hybrid system.
The non-thermal plasma reactor had high content of NO
and NO2, whereas the concentration of these two pollutants
dropped dramatically in hybrid system; moreover, the
generated ozone from the non-thermal plasma process was
degraded on the photocatalyst and consequently was not
detected in the output gas of the combined system. The
generated organic by-products in non-thermal plasma
process (phosgene and trichloroacetaldehyde) were reoxidized
with un-oxidized chloroform in the second stage of
the combined system. This increased the selectivity of CO2
and Cl2.
Keywords
Non-thermal plasma; Photocatalytic oxidation; Chloroform; Expanded graphite
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