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Birnessite-induced mechanochemical degradation of 2,4-dichlorophenol
Year:
2014
Source of publication :
Chemosphere
Authors :
Mingelgrin, Uri
;
.
Nasser, Ahmed
;
.
Volume :
107
Co-Authors:
Nasser, A., Institute of Soils, Water and Environmental Sciences, ARO, Volcani Center, POB 6, Bet Dagan 50-250, Israel
Mingelgrin, U., Institute of Soils, Water and Environmental Sciences, ARO, Volcani Center, POB 6, Bet Dagan 50-250, Israel
Facilitators :
From page:
175
To page:
179
(
Total pages:
5
)
Abstract:
DCP (2,4-dichlorophenol) is the key-intermediate in the synthesis of some widely used pesticides and is an EPA priority pollutant. The mechanochemical breakdown of DCP loaded on birnessite (δ-MnO2), montmorillonite saturated with Na+ or Cu2+ and hematite was investigated. Mechanical force was applied by grinding of mixtures of DCP and the minerals, using mortar and pestle. Grinding of DCP for 5min with the montmorillonites or with hematite resulted in negligible degradation during grinding, while grinding with birnessite induced the immediate degradation of 90% of the loaded DCP. Incubation for 24h after grinding did result in up to 30% degradation of the DCP loaded on the other minerals tested.HPLC and LC-MS analysis revealed that the transformation of DCP yielded oligomerization products as well as partial dechlorination. DCP degradation on birnessite was accompanied with a substantial increase in the extractability of manganese from the mineral into an acidic aqueous solution, indicating that Mn(IV) in the mineral transformed into Mn(II) and that birnessite served as an electron acceptor in the transformation. The oligomerization and partial dechlorination brought about by grinding, suggest a reduction in bioavailability and toxicity. © 2013 Elsevier Ltd.
Note:
Related Files :
Biochemistry
Biodegradation
biotransformation
Clay minerals
phenol
water
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More details
DOI :
10.1016/j.chemosphere.2013.11.058
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
19168
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:26
Scientific Publication
Birnessite-induced mechanochemical degradation of 2,4-dichlorophenol
107
Nasser, A., Institute of Soils, Water and Environmental Sciences, ARO, Volcani Center, POB 6, Bet Dagan 50-250, Israel
Mingelgrin, U., Institute of Soils, Water and Environmental Sciences, ARO, Volcani Center, POB 6, Bet Dagan 50-250, Israel
Birnessite-induced mechanochemical degradation of 2,4-dichlorophenol
DCP (2,4-dichlorophenol) is the key-intermediate in the synthesis of some widely used pesticides and is an EPA priority pollutant. The mechanochemical breakdown of DCP loaded on birnessite (δ-MnO2), montmorillonite saturated with Na+ or Cu2+ and hematite was investigated. Mechanical force was applied by grinding of mixtures of DCP and the minerals, using mortar and pestle. Grinding of DCP for 5min with the montmorillonites or with hematite resulted in negligible degradation during grinding, while grinding with birnessite induced the immediate degradation of 90% of the loaded DCP. Incubation for 24h after grinding did result in up to 30% degradation of the DCP loaded on the other minerals tested.HPLC and LC-MS analysis revealed that the transformation of DCP yielded oligomerization products as well as partial dechlorination. DCP degradation on birnessite was accompanied with a substantial increase in the extractability of manganese from the mineral into an acidic aqueous solution, indicating that Mn(IV) in the mineral transformed into Mn(II) and that birnessite served as an electron acceptor in the transformation. The oligomerization and partial dechlorination brought about by grinding, suggest a reduction in bioavailability and toxicity. © 2013 Elsevier Ltd.
Scientific Publication
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