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Photocatalytic degradation of eight pesticides in leaching water by use of ZnO under natural sunlight.
J Hazard Mater. 2009 Dec 30; 172(2-3):1303-10.JH

Abstract

Photodegradation of eight pesticides in leaching water at pilot plant scale using the tandem ZnO/Na(2)S(2)O(8) as photosensitizer/oxidant and compound parabolic collectors under natural sunlight is reported. The pesticides, habitually used on pepper culture and belonging to different chemical groups were azoxyxtrobin, kresoxim-methyl, hexaconazole, tebuconazole, triadimenol, and pyrimethanil (fungicides), primicarb (insecticide), and propyzamide (herbicide). As expected, the influence of the semiconductor used at 150 mg L(-1) on the degradation of pesticides was very significant in all cases. Photocatalytic experiments show that the addition of photosensitizer strongly improves the elimination of pesticides in comparison with photolytic tests; significantly increasing the reaction rates. The use of Na(2)S(2)O(8) implies a significant reduction in treatment time showing a quicker reaction time than ZnO alone. On the contrary, the addition of H(2)O(2) into illuminated ZnO suspensions does not improve the rate of photooxidation. The disappearance of the pesticides followed first-order kinetics according to Langmuir-Hinshelwood model and complete degradation occurs from 60 to 120 min. The disappearance time (DT(75)), referred to the normalized illumination time (t(30 W)) was lower than 3 min in all cases.

Authors+Show Affiliations

Departamento de Química Agrícola, Geología y Edafología. Facultad de Química, Universidad de Murcia, Murcia, Spain. snavarro@um.esNo 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

19729242

Citation

Navarro, S, et al. "Photocatalytic Degradation of Eight Pesticides in Leaching Water By Use of ZnO Under Natural Sunlight." Journal of Hazardous Materials, vol. 172, no. 2-3, 2009, pp. 1303-10.
Navarro S, Fenoll J, Vela N, et al. Photocatalytic degradation of eight pesticides in leaching water by use of ZnO under natural sunlight. J Hazard Mater. 2009;172(2-3):1303-10.
Navarro, S., Fenoll, J., Vela, N., Ruiz, E., & Navarro, G. (2009). Photocatalytic degradation of eight pesticides in leaching water by use of ZnO under natural sunlight. Journal of Hazardous Materials, 172(2-3), 1303-10. https://doi.org/10.1016/j.jhazmat.2009.07.137
Navarro S, et al. Photocatalytic Degradation of Eight Pesticides in Leaching Water By Use of ZnO Under Natural Sunlight. J Hazard Mater. 2009 Dec 30;172(2-3):1303-10. PubMed PMID: 19729242.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Photocatalytic degradation of eight pesticides in leaching water by use of ZnO under natural sunlight. AU - Navarro,S, AU - Fenoll,J, AU - Vela,N, AU - Ruiz,E, AU - Navarro,G, Y1 - 2009/08/08/ PY - 2009/04/29/received PY - 2009/07/30/revised PY - 2009/07/30/accepted PY - 2009/9/5/entrez PY - 2009/9/5/pubmed PY - 2010/2/10/medline SP - 1303 EP - 10 JF - Journal of hazardous materials JO - J Hazard Mater VL - 172 IS - 2-3 N2 - Photodegradation of eight pesticides in leaching water at pilot plant scale using the tandem ZnO/Na(2)S(2)O(8) as photosensitizer/oxidant and compound parabolic collectors under natural sunlight is reported. The pesticides, habitually used on pepper culture and belonging to different chemical groups were azoxyxtrobin, kresoxim-methyl, hexaconazole, tebuconazole, triadimenol, and pyrimethanil (fungicides), primicarb (insecticide), and propyzamide (herbicide). As expected, the influence of the semiconductor used at 150 mg L(-1) on the degradation of pesticides was very significant in all cases. Photocatalytic experiments show that the addition of photosensitizer strongly improves the elimination of pesticides in comparison with photolytic tests; significantly increasing the reaction rates. The use of Na(2)S(2)O(8) implies a significant reduction in treatment time showing a quicker reaction time than ZnO alone. On the contrary, the addition of H(2)O(2) into illuminated ZnO suspensions does not improve the rate of photooxidation. The disappearance of the pesticides followed first-order kinetics according to Langmuir-Hinshelwood model and complete degradation occurs from 60 to 120 min. The disappearance time (DT(75)), referred to the normalized illumination time (t(30 W)) was lower than 3 min in all cases. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/19729242/Photocatalytic_degradation_of_eight_pesticides_in_leaching_water_by_use_of_ZnO_under_natural_sunlight_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(09)01270-9 DB - PRIME DP - Unbound Medicine ER -