The Experts below are selected from a list of 57 Experts worldwide ranked by ideXlab platform
Dongxing Yuan - One of the best experts on this subject based on the ideXlab platform.
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degradation kinetics and products of triazophos in intertidal sediment
Journal of Environmental Sciences-china, 2005Co-Authors: Dongxing YuanAbstract:This work presents laboratory studies on the degradation of triazophos in intertidal sediment. The overall degradations were found to follow the first-order decay model. After being incubated for 6 d, the percentage of degradations of triazophos in unsterilized and sterilized sediments were 94.5% and 20.5%, respectively. Between the temperatures of 15℃ and 35℃, the observed degradation rate constant(k_ obsd) enhanced as the incubation temperature increased. Triazophos in sediment degraded faster under aerobic condition than under anaerobic one. The water content of sediment had little influence on the degradation when it was in the range of 50%—100%. The values of k_ obsd decreased with increasing initial concentration of triazophos in sediment, which could result from the microorganism inhibition by triazophos. Four major degradation products, o,o-diethyl Phosphorothioic Acid, monoethyl Phosphorothioic Acid, Phosphorothioic Acid, and 1-phenyl-3-hydroxy-1,2,4-triazole, were tentatively identified as their corresponding trimethylsilyl derivatives with a gas chromato-graphy-mass spectrometer. The possible degradation pathway of triazophos in intertidal sediment was proposed. The results revealed that triazophos in intertidal sediment was relatively unstable and could be easily degraded.
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kinetics and products of photo fenton degradation of triazophos
Journal of Agricultural and Food Chemistry, 2004Co-Authors: Dongxing Yuan, Meng Chen, Yongzhi DengAbstract:Triazophos is a contaminant of wastewater at manufacturing facilities, and remediative treatment may be needed. While toxicity and persistence limit the effectiveness of biological and physicochemical methods, photo-Fenton processes are promising. UV-Fenton and solar-Fenton processes were applied to degrade triazophos. The optimum parameters were 50 mmol/L H2O2, 0.3 mmol/L FeSO4, and pH 3.0. The decomposition of triazophos by a photo-Fenton process followed first-order kinemics. At 30 °C, the half-life of triazophos in a UV-Fenton process ranged from 9.1 min at 2.0 × 105 Lx to 27.3 min at 1.0 × 105 Lx. At 35 °C and with solar irradiation luminance, it ranged within 1.0 × 105 −1.2 × 105 Lx; the half-life of triazophos in the solar-Fenton process was 11.2 min. Five major degradation products, O,O-diethyl Phosphorothioic Acid, monoethyl Phosphorothioic Acid, Phosphorothioic Acid, 1-phenyl-3-hydroxy-1,2,4-triazole, and phenylsemicarbazine, were tentatively identified as their corresponding trimethylsilyl deri...
Yongzhi Deng - One of the best experts on this subject based on the ideXlab platform.
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kinetics and products of photo fenton degradation of triazophos
Journal of Agricultural and Food Chemistry, 2004Co-Authors: Dongxing Yuan, Meng Chen, Yongzhi DengAbstract:Triazophos is a contaminant of wastewater at manufacturing facilities, and remediative treatment may be needed. While toxicity and persistence limit the effectiveness of biological and physicochemical methods, photo-Fenton processes are promising. UV-Fenton and solar-Fenton processes were applied to degrade triazophos. The optimum parameters were 50 mmol/L H2O2, 0.3 mmol/L FeSO4, and pH 3.0. The decomposition of triazophos by a photo-Fenton process followed first-order kinemics. At 30 °C, the half-life of triazophos in a UV-Fenton process ranged from 9.1 min at 2.0 × 105 Lx to 27.3 min at 1.0 × 105 Lx. At 35 °C and with solar irradiation luminance, it ranged within 1.0 × 105 −1.2 × 105 Lx; the half-life of triazophos in the solar-Fenton process was 11.2 min. Five major degradation products, O,O-diethyl Phosphorothioic Acid, monoethyl Phosphorothioic Acid, Phosphorothioic Acid, 1-phenyl-3-hydroxy-1,2,4-triazole, and phenylsemicarbazine, were tentatively identified as their corresponding trimethylsilyl deri...
Mao Minoura - One of the best experts on this subject based on the ideXlab platform.
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fluorinative hydrolysis of Phosphorothioic Acid esters with a binaphthyl group through axis to center chirality transfer leading to the formation of p chiral Phosphorothioic monofluoridic Acid salts
Chemical Communications, 2014Co-Authors: Toshiaki Murai, Takae Hayashi, Kyohei Yamada, Yuuki Maekawa, Mao MinouraAbstract:Asymmetric synthesis of P-chiral Phosphorothioic monofluoridic Acid ammonium salts was achieved via axis-to-center chirality transfer reactions by using Phosphorothioic Acid O-esters with a binaphthyl group, and the absolute stereochemistry of the salts was determined by X-ray analyses and by comparison of their CD spectra.
Pierre Pichat - One of the best experts on this subject based on the ideXlab platform.
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photocatalytic pollutant removal in water at room temperature case study of the total degradation of the insecticide fenitrothion Phosphorothioic Acid o o dimethyl o 3 methyl 4 nitro phenyl ester
Catalysis Today, 1996Co-Authors: Mikhail Kerzhentsev, Chantal Guillard, Jeanmarie Herrmann, Pierre PichatAbstract:The photocatalytic purification of water containing fenitrothion has been performed in TiO2 aqueous suspensions. The mineralization into CO2, H2PO4−, SO42−, NO3− was achieved. Several intermediates have been identified by HPLC and GC/MS. They illustrate the transformation of PS into PO, the splitting between the phosphorous part and the aromatic moiety and the transfer of methyl or methoxy groups. Formate ions, principally produced from the CH3O and CH3, groups and acetate ions were also detected as intermediate products.
Meng Chen - One of the best experts on this subject based on the ideXlab platform.
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kinetics and products of photo fenton degradation of triazophos
Journal of Agricultural and Food Chemistry, 2004Co-Authors: Dongxing Yuan, Meng Chen, Yongzhi DengAbstract:Triazophos is a contaminant of wastewater at manufacturing facilities, and remediative treatment may be needed. While toxicity and persistence limit the effectiveness of biological and physicochemical methods, photo-Fenton processes are promising. UV-Fenton and solar-Fenton processes were applied to degrade triazophos. The optimum parameters were 50 mmol/L H2O2, 0.3 mmol/L FeSO4, and pH 3.0. The decomposition of triazophos by a photo-Fenton process followed first-order kinemics. At 30 °C, the half-life of triazophos in a UV-Fenton process ranged from 9.1 min at 2.0 × 105 Lx to 27.3 min at 1.0 × 105 Lx. At 35 °C and with solar irradiation luminance, it ranged within 1.0 × 105 −1.2 × 105 Lx; the half-life of triazophos in the solar-Fenton process was 11.2 min. Five major degradation products, O,O-diethyl Phosphorothioic Acid, monoethyl Phosphorothioic Acid, Phosphorothioic Acid, 1-phenyl-3-hydroxy-1,2,4-triazole, and phenylsemicarbazine, were tentatively identified as their corresponding trimethylsilyl deri...