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Removal of alachlor, diuron and isoproturon in water in a falling film dielectric barrier discharge (DBD) reactor combined with adsorption on activated carbon textile : reaction mechanisms and oxidation by-products

Patrick Vanraes (UGent) , Niels Wardenier (UGent) , Pieter Surmont (UGent) , Frederic Lynen (UGent) , Anton Nikiforov (UGent) , Stijn Van Hulle (UGent) , Christophe Leys (UGent) and Annemie Bogaerts
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Abstract
A falling film dielectric barrier discharge (DBD) plasma reactor combined with adsorption on activated carbon textile material was optimized to minimize the formation of hazardous oxidation by-products from the treatment of persistent pesticides (alachlor, diuron and isoproturon) in water. The formation of by-products and the reaction mechanism was investigated by HPLC-TOF-MS. The maximum concentration of each by-product was at least two orders of magnitude below the initial pesticide concentration, during the first 10 min of treatment. After 30 min of treatment, the individual by-product concentrations had decreased to values of at least three orders of magnitude below the initial pesticide concentration. The proposed oxidation pathways revealed five main oxidation steps: dechlorination, dealkylation, hydroxylation, addition of a double-bonded oxygen and nitrification. The latter is one of the main oxidation mechanisms of diuron and isoproturon for air plasma treatment. To our knowledge, this is the first time that the formation of nitrificated intermediates is reported for the plasma treatment of non-phenolic compounds.
Keywords
Wastewater treatment, Advanced oxidation process, Aromatic micropollutants, Ozonation, Pesticides, TANDEM MASS-SPECTROMETRY, TREATMENT-PLANT EFFLUENTS, AQUEOUS-SOLUTION, PHOTOCATALYTIC DEGRADATION, LIQUID-CHROMATOGRAPHY, HERBICIDE DIURON, PHENYLUREA HERBICIDES, CHLORINE DIOXIDE, OZONATION, PESTICIDES

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Chicago
Vanraes, Patrick, Niels Wardenier, Pieter Surmont, Frederic Lynen, Anton Nikiforov, Stijn Van Hulle, Christophe Leys, and Annemie Bogaerts. 2018. “Removal of Alachlor, Diuron and Isoproturon in Water in a Falling Film Dielectric Barrier Discharge (DBD) Reactor Combined with Adsorption on Activated Carbon Textile : Reaction Mechanisms and Oxidation By-products.” Journal of Hazardous Materials 354: 180–190.
APA
Vanraes, P., Wardenier, N., Surmont, P., Lynen, F., Nikiforov, A., Van Hulle, S., Leys, C., et al. (2018). Removal of alachlor, diuron and isoproturon in water in a falling film dielectric barrier discharge (DBD) reactor combined with adsorption on activated carbon textile : reaction mechanisms and oxidation by-products. JOURNAL OF HAZARDOUS MATERIALS, 354, 180–190.
Vancouver
1.
Vanraes P, Wardenier N, Surmont P, Lynen F, Nikiforov A, Van Hulle S, et al. Removal of alachlor, diuron and isoproturon in water in a falling film dielectric barrier discharge (DBD) reactor combined with adsorption on activated carbon textile : reaction mechanisms and oxidation by-products. JOURNAL OF HAZARDOUS MATERIALS. 2018;354:180–90.
MLA
Vanraes, Patrick, Niels Wardenier, Pieter Surmont, et al. “Removal of Alachlor, Diuron and Isoproturon in Water in a Falling Film Dielectric Barrier Discharge (DBD) Reactor Combined with Adsorption on Activated Carbon Textile : Reaction Mechanisms and Oxidation By-products.” JOURNAL OF HAZARDOUS MATERIALS 354 (2018): 180–190. Print.
@article{8561441,
  abstract     = {A falling film dielectric barrier discharge (DBD) plasma reactor combined with adsorption on activated carbon textile material was optimized to minimize the formation of hazardous oxidation by-products from the treatment of persistent pesticides (alachlor, diuron and isoproturon) in water. The formation of by-products and the reaction mechanism was investigated by HPLC-TOF-MS. The maximum concentration of each by-product was at least two orders of magnitude below the initial pesticide concentration, during the first 10 min of treatment. After 30 min of treatment, the individual by-product concentrations had decreased to values of at least three orders of magnitude below the initial pesticide concentration. The proposed oxidation pathways revealed five main oxidation steps: dechlorination, dealkylation, hydroxylation, addition of a double-bonded oxygen and nitrification. The latter is one of the main oxidation mechanisms of diuron and isoproturon for air plasma treatment. To our knowledge, this is the first time that the formation of nitrificated intermediates is reported for the plasma treatment of non-phenolic compounds.},
  author       = {Vanraes, Patrick and Wardenier, Niels and Surmont, Pieter and Lynen, Frederic and Nikiforov, Anton and Van Hulle, Stijn and Leys, Christophe and Bogaerts, Annemie},
  issn         = {0304-3894},
  journal      = {JOURNAL OF HAZARDOUS MATERIALS},
  keyword      = {Wastewater treatment,Advanced oxidation process,Aromatic micropollutants,Ozonation,Pesticides,TANDEM MASS-SPECTROMETRY,TREATMENT-PLANT EFFLUENTS,AQUEOUS-SOLUTION,PHOTOCATALYTIC DEGRADATION,LIQUID-CHROMATOGRAPHY,HERBICIDE DIURON,PHENYLUREA HERBICIDES,CHLORINE DIOXIDE,OZONATION,PESTICIDES},
  language     = {eng},
  pages        = {180--190},
  title        = {Removal of alachlor, diuron and isoproturon in water in a falling film dielectric barrier discharge (DBD) reactor combined with adsorption on activated carbon textile : reaction mechanisms and oxidation by-products},
  url          = {http://dx.doi.org/10.1016/j.jhazmat.2018.05.007},
  volume       = {354},
  year         = {2018},
}

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