The Experts below are selected from a list of 216 Experts worldwide ranked by ideXlab platform
J Garciaanton - One of the best experts on this subject based on the ideXlab platform.
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photoelectrocatalyzed degradation of a pesticides mixture solution Chlorfenvinphos and bromacil by wo3 nanosheets
Science of The Total Environment, 2019Co-Authors: G Rosellomarquez, R M Fernandezdomene, R Sancheztovar, B Lucasgranados, S Garciacarrion, J GarciaantonAbstract:Abstract A photoelectrocatalyst consisting of WO3 nanosheets or nanorods has been synthesized by electrochemical anodization under hydrodynamic conditions, and has been used for the degradation of two toxic pesticides: Chlorfenvinphos and bromacil. Nanostructures have been characterized by FESEM and Raman spectroscopy. Photoelectrochemical degradation tests have been carried out both for individual pesticide solutions and for a mixture solution, and the concentration evolution with time has been followed by UV–Vis spectrophotometry. For individual pesticides, pseudo-first order kinetic coefficients of 0.402 h−1 and 0.324 h−1 have been obtained for Chlorfenvinphos and bromacil, respectively, while for the mixture solution, these kinetic coefficients have been 0.162 h−1 and 0.408 h−1. The change in behavior towards pesticide degradation depending on whether individual or mixture solutions were used might be indicative of a competitive process between the two pesticide molecules when interacting with the WO3 nanostructures surface or when approaching the semiconductor/electrolyte interface.
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photoelectrochemical removal of Chlorfenvinphos by using wo3 nanorods influence of annealing temperature and operation ph
Separation and Purification Technology, 2019Co-Authors: R M Fernandezdomene, G Rosellomarquez, R Sancheztovar, B Lucasgranados, J GarciaantonAbstract:Abstract A visible-light driven photoelectrochemical degradation process has been applied to a solution polluted with the organophosphate insecticide Chlorfenvinphos. Different WO3 nanosheets/nanorods have been used as photoanodes. These nanostructured electrodes have been fabricated by anodization of tungsten and, subsequently, they have been subjected to a thermal treatment (annealing). The combined influence of annealing temperature (400 °C and 600 °C) and operation pH (1 and 3) on the photoelectrocatalytic behavior of these nanorods has been examined through a statistical analysis. Morphological, structural and photoelectrochemical characterizations have also been carried out. The Chlorfenvinphos degradation efficiency depended both on annealing temperature and, specially, operation pH. At pH 1 and using an annealing temperature of 600 °C, Chlorfenvinphos has been effectively degraded following pseudo-first order kinetics with a coefficient of 7.8 × 10−3 min−1, and notably mineralized (more than 65% of Total Organic Carbon decrease).
R M Fernandezdomene - One of the best experts on this subject based on the ideXlab platform.
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photoelectrocatalyzed degradation of a pesticides mixture solution Chlorfenvinphos and bromacil by wo3 nanosheets
Science of The Total Environment, 2019Co-Authors: G Rosellomarquez, R M Fernandezdomene, R Sancheztovar, B Lucasgranados, S Garciacarrion, J GarciaantonAbstract:Abstract A photoelectrocatalyst consisting of WO3 nanosheets or nanorods has been synthesized by electrochemical anodization under hydrodynamic conditions, and has been used for the degradation of two toxic pesticides: Chlorfenvinphos and bromacil. Nanostructures have been characterized by FESEM and Raman spectroscopy. Photoelectrochemical degradation tests have been carried out both for individual pesticide solutions and for a mixture solution, and the concentration evolution with time has been followed by UV–Vis spectrophotometry. For individual pesticides, pseudo-first order kinetic coefficients of 0.402 h−1 and 0.324 h−1 have been obtained for Chlorfenvinphos and bromacil, respectively, while for the mixture solution, these kinetic coefficients have been 0.162 h−1 and 0.408 h−1. The change in behavior towards pesticide degradation depending on whether individual or mixture solutions were used might be indicative of a competitive process between the two pesticide molecules when interacting with the WO3 nanostructures surface or when approaching the semiconductor/electrolyte interface.
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photoelectrochemical removal of Chlorfenvinphos by using wo3 nanorods influence of annealing temperature and operation ph
Separation and Purification Technology, 2019Co-Authors: R M Fernandezdomene, G Rosellomarquez, R Sancheztovar, B Lucasgranados, J GarciaantonAbstract:Abstract A visible-light driven photoelectrochemical degradation process has been applied to a solution polluted with the organophosphate insecticide Chlorfenvinphos. Different WO3 nanosheets/nanorods have been used as photoanodes. These nanostructured electrodes have been fabricated by anodization of tungsten and, subsequently, they have been subjected to a thermal treatment (annealing). The combined influence of annealing temperature (400 °C and 600 °C) and operation pH (1 and 3) on the photoelectrocatalytic behavior of these nanorods has been examined through a statistical analysis. Morphological, structural and photoelectrochemical characterizations have also been carried out. The Chlorfenvinphos degradation efficiency depended both on annealing temperature and, specially, operation pH. At pH 1 and using an annealing temperature of 600 °C, Chlorfenvinphos has been effectively degraded following pseudo-first order kinetics with a coefficient of 7.8 × 10−3 min−1, and notably mineralized (more than 65% of Total Organic Carbon decrease).
R Oledzka - One of the best experts on this subject based on the ideXlab platform.
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effect of Chlorfenvinphos cypermethrin and their mixture on the intestinal transport of leucine and methionine
Journal of Applied Toxicology, 1996Co-Authors: łukasz Sedrowicz, D Witkowska, R OledzkaAbstract:We assessed the effect of 2-week oral treatment with Chlorfenvinphos, cypermethrin and their mixture in a dose of 5% LD50 on the intestinal transport of L-leucine (Leu) and L-methionine (Met) in male Wistar rats. Both in vitro (jejunal slices) and in vivo (intestinal perfusion) methods were employed in the study, using Leu and Met labelled with 14C as markers of the investigated processes. Additionally, in the in vitro study, concentrations of two amino acids were measured in the whole blood, serum, liver and perfused segment of the intestine. In the in vitro study the kinetic constants describing the active and passive Leu and Met uptake were determined. The active uptake was found to be particularly affected by oral intoxication with Chlorfenvinphos, cypermethrin and their mixture. This susceptibility was seen as major alterations in the parameters of active uptake, i.e. Jm and Kt constants in the pesticide-exposed groups as compared to controls. In the in vivo study we found a decreased rate of Leu and Met disappearance from the intestinal lumen, decreased blood concentrations of Leu and Met and decreased liver content of Leu in the pesticide-exposed groups as compared to controls. The findings allow the conclusion that oral administration of Chlorfenvinphos, cypermethrin and their mixture in a dose of 5% LD50 impairs the intestinal transport of Leu and Met and alters their distribution in the rodent body.
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studies on the combined effect of pesticide mixtures belonging to different chemical groups on calcium absorption in rat intestine part ii Chlorfenvinphos and cypermethrin
Roczniki Państwowego Zakładu Higieny, 1991Co-Authors: D Witkowska, R Oledzka, L SedrowiczAbstract:: In male Wistar rats study was made of the effect of multiple treatment (14 days) with single pesticides (Chlorfenvinphos and cypermethrin) and with their mixture on intestinal calcium absorption. Pesticides were administered intragastrically through a stomach tube in a daily dose corresponding to 5% of LD50; in the case of the pesticide mixture, 5% of LD50 of each component were administered. Calcium uptake (active and passive) by duodenal sections were determined by the method of Papworth and Patrick, modified by the present authors. It was found that under the applied experimental conditions Chlorfenvinphos influences the active transport of calcium, causing an increase in the values of the constants Jm (maximal transport rate) and Kt (affinity of calcium to carrier), whereas it inhibits the passive transport. Similar changes were displayed by rats exposed to cypermethrin. On the other hand, combined administration of both pesticides led to a lack of changes in the efficiency of active transport and to impairment of passive transport, as compared with control.
G Rosellomarquez - One of the best experts on this subject based on the ideXlab platform.
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photoelectrocatalyzed degradation of a pesticides mixture solution Chlorfenvinphos and bromacil by wo3 nanosheets
Science of The Total Environment, 2019Co-Authors: G Rosellomarquez, R M Fernandezdomene, R Sancheztovar, B Lucasgranados, S Garciacarrion, J GarciaantonAbstract:Abstract A photoelectrocatalyst consisting of WO3 nanosheets or nanorods has been synthesized by electrochemical anodization under hydrodynamic conditions, and has been used for the degradation of two toxic pesticides: Chlorfenvinphos and bromacil. Nanostructures have been characterized by FESEM and Raman spectroscopy. Photoelectrochemical degradation tests have been carried out both for individual pesticide solutions and for a mixture solution, and the concentration evolution with time has been followed by UV–Vis spectrophotometry. For individual pesticides, pseudo-first order kinetic coefficients of 0.402 h−1 and 0.324 h−1 have been obtained for Chlorfenvinphos and bromacil, respectively, while for the mixture solution, these kinetic coefficients have been 0.162 h−1 and 0.408 h−1. The change in behavior towards pesticide degradation depending on whether individual or mixture solutions were used might be indicative of a competitive process between the two pesticide molecules when interacting with the WO3 nanostructures surface or when approaching the semiconductor/electrolyte interface.
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photoelectrochemical removal of Chlorfenvinphos by using wo3 nanorods influence of annealing temperature and operation ph
Separation and Purification Technology, 2019Co-Authors: R M Fernandezdomene, G Rosellomarquez, R Sancheztovar, B Lucasgranados, J GarciaantonAbstract:Abstract A visible-light driven photoelectrochemical degradation process has been applied to a solution polluted with the organophosphate insecticide Chlorfenvinphos. Different WO3 nanosheets/nanorods have been used as photoanodes. These nanostructured electrodes have been fabricated by anodization of tungsten and, subsequently, they have been subjected to a thermal treatment (annealing). The combined influence of annealing temperature (400 °C and 600 °C) and operation pH (1 and 3) on the photoelectrocatalytic behavior of these nanorods has been examined through a statistical analysis. Morphological, structural and photoelectrochemical characterizations have also been carried out. The Chlorfenvinphos degradation efficiency depended both on annealing temperature and, specially, operation pH. At pH 1 and using an annealing temperature of 600 °C, Chlorfenvinphos has been effectively degraded following pseudo-first order kinetics with a coefficient of 7.8 × 10−3 min−1, and notably mineralized (more than 65% of Total Organic Carbon decrease).
B Lucasgranados - One of the best experts on this subject based on the ideXlab platform.
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photoelectrocatalyzed degradation of a pesticides mixture solution Chlorfenvinphos and bromacil by wo3 nanosheets
Science of The Total Environment, 2019Co-Authors: G Rosellomarquez, R M Fernandezdomene, R Sancheztovar, B Lucasgranados, S Garciacarrion, J GarciaantonAbstract:Abstract A photoelectrocatalyst consisting of WO3 nanosheets or nanorods has been synthesized by electrochemical anodization under hydrodynamic conditions, and has been used for the degradation of two toxic pesticides: Chlorfenvinphos and bromacil. Nanostructures have been characterized by FESEM and Raman spectroscopy. Photoelectrochemical degradation tests have been carried out both for individual pesticide solutions and for a mixture solution, and the concentration evolution with time has been followed by UV–Vis spectrophotometry. For individual pesticides, pseudo-first order kinetic coefficients of 0.402 h−1 and 0.324 h−1 have been obtained for Chlorfenvinphos and bromacil, respectively, while for the mixture solution, these kinetic coefficients have been 0.162 h−1 and 0.408 h−1. The change in behavior towards pesticide degradation depending on whether individual or mixture solutions were used might be indicative of a competitive process between the two pesticide molecules when interacting with the WO3 nanostructures surface or when approaching the semiconductor/electrolyte interface.
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photoelectrochemical removal of Chlorfenvinphos by using wo3 nanorods influence of annealing temperature and operation ph
Separation and Purification Technology, 2019Co-Authors: R M Fernandezdomene, G Rosellomarquez, R Sancheztovar, B Lucasgranados, J GarciaantonAbstract:Abstract A visible-light driven photoelectrochemical degradation process has been applied to a solution polluted with the organophosphate insecticide Chlorfenvinphos. Different WO3 nanosheets/nanorods have been used as photoanodes. These nanostructured electrodes have been fabricated by anodization of tungsten and, subsequently, they have been subjected to a thermal treatment (annealing). The combined influence of annealing temperature (400 °C and 600 °C) and operation pH (1 and 3) on the photoelectrocatalytic behavior of these nanorods has been examined through a statistical analysis. Morphological, structural and photoelectrochemical characterizations have also been carried out. The Chlorfenvinphos degradation efficiency depended both on annealing temperature and, specially, operation pH. At pH 1 and using an annealing temperature of 600 °C, Chlorfenvinphos has been effectively degraded following pseudo-first order kinetics with a coefficient of 7.8 × 10−3 min−1, and notably mineralized (more than 65% of Total Organic Carbon decrease).