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Photocatalytic degradation of substituted phenylurea herbicides in aqueous semiconductor suspensions exposed to solar energy.
Chemosphere. 2013 Apr; 91(5):571-8.C

Abstract

The photocatalyzed degradation of the biocides chlorotoluron, diuron, fluometuron, isoproturon and linuron (substituted phenylurea herbicides) was investigated in aqueous suspensions of ZnO, TiO2, WO3, SnO2 and ZnS at pilot plant scale under natural sunlight. Comparison of the five catalysts showed that ZnO is the most effective for catalyzing the removal of all the compounds studied. The primary degradation of the herbicides followed a pseudo-first order kinetics. In our conditions, the time required for 90% degradation ranged from 23 to 47min for isoproturon and linuron, respectively, when using the tandem ZnO/Na2S2O8. Eight transformation products were identified by HPLC-MS(2) during the experiments, although at the end of the photoperiod (240min), their concentrations were below detection limits. Based on derivative identification, the proposed metabolic pathways would involve N-demethylation and N-demethoxylation of the N-methoxy-N-methyl substituted ureas and N-demethylation of the N,N-dimethylurea-substituted compounds.

Authors+Show Affiliations

Departamento de Calidad y Garantía Alimentaria, Instituto Murciano de Investigación y Desarrollo Agrario y Alimentario (IMIDA), C/Mayor s/n, La Alberca, Murcia, Spain.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

23298667

Citation

Fenoll, José, et al. "Photocatalytic Degradation of Substituted Phenylurea Herbicides in Aqueous Semiconductor Suspensions Exposed to Solar Energy." Chemosphere, vol. 91, no. 5, 2013, pp. 571-8.
Fenoll J, Martínez-Menchón M, Navarro G, et al. Photocatalytic degradation of substituted phenylurea herbicides in aqueous semiconductor suspensions exposed to solar energy. Chemosphere. 2013;91(5):571-8.
Fenoll, J., Martínez-Menchón, M., Navarro, G., Vela, N., & Navarro, S. (2013). Photocatalytic degradation of substituted phenylurea herbicides in aqueous semiconductor suspensions exposed to solar energy. Chemosphere, 91(5), 571-8. https://doi.org/10.1016/j.chemosphere.2012.11.067
Fenoll J, et al. Photocatalytic Degradation of Substituted Phenylurea Herbicides in Aqueous Semiconductor Suspensions Exposed to Solar Energy. Chemosphere. 2013;91(5):571-8. PubMed PMID: 23298667.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Photocatalytic degradation of substituted phenylurea herbicides in aqueous semiconductor suspensions exposed to solar energy. AU - Fenoll,José, AU - Martínez-Menchón,Marina, AU - Navarro,Ginés, AU - Vela,Nuria, AU - Navarro,Simón, Y1 - 2013/01/05/ PY - 2012/09/12/received PY - 2012/11/27/revised PY - 2012/11/28/accepted PY - 2013/1/10/entrez PY - 2013/1/10/pubmed PY - 2013/9/6/medline SP - 571 EP - 8 JF - Chemosphere JO - Chemosphere VL - 91 IS - 5 N2 - The photocatalyzed degradation of the biocides chlorotoluron, diuron, fluometuron, isoproturon and linuron (substituted phenylurea herbicides) was investigated in aqueous suspensions of ZnO, TiO2, WO3, SnO2 and ZnS at pilot plant scale under natural sunlight. Comparison of the five catalysts showed that ZnO is the most effective for catalyzing the removal of all the compounds studied. The primary degradation of the herbicides followed a pseudo-first order kinetics. In our conditions, the time required for 90% degradation ranged from 23 to 47min for isoproturon and linuron, respectively, when using the tandem ZnO/Na2S2O8. Eight transformation products were identified by HPLC-MS(2) during the experiments, although at the end of the photoperiod (240min), their concentrations were below detection limits. Based on derivative identification, the proposed metabolic pathways would involve N-demethylation and N-demethoxylation of the N-methoxy-N-methyl substituted ureas and N-demethylation of the N,N-dimethylurea-substituted compounds. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/23298667/Photocatalytic_degradation_of_substituted_phenylurea_herbicides_in_aqueous_semiconductor_suspensions_exposed_to_solar_energy_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(12)01472-5 DB - PRIME DP - Unbound Medicine ER -