Добірка наукової літератури з теми "Hydroxyle radical. Chlore. Ozone"
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Статті в журналах з теми "Hydroxyle radical. Chlore. Ozone"
Ye, Miaomiao, Tuqiao Zhang, Zhiwei Zhu, Yan Zhang, and Yiping Zhang. "Photodegradation of 4-chloronitrobenzene in the presence of aqueous titania suspensions in different gas atmospheres." Water Science and Technology 64, no. 7 (October 1, 2011): 1466–72. http://dx.doi.org/10.2166/wst.2011.531.
Повний текст джерела"Soil adsorption behaviour and photomineralization by photocatalytic membranes immobilizing titanium dioxide of atrazine and intermediates." Issue 1 1, no. 1 (April 28, 2013): 23–32. http://dx.doi.org/10.30955/gnj.000116.
Повний текст джерелаДисертації з теми "Hydroxyle radical. Chlore. Ozone"
Hamdi, El Najjar Nasma. "Cinétiques et mécanismes d'oxydation de composés pharmaceutiques par le chlore, l'ozone et les radicaux hydroxyle." Thesis, Poitiers, 2012. http://www.theses.fr/2012POIT2264/document.
Повний текст джерелаRecently, the presence of pharmaceuticals in the aquatic environment has been reported as an emerging environmental issue. Actually, numerous pharmaceuticals have been detected in surface waters. Chlorination, ozonation and oxidation by hydroxyl radicals are widely used in water treatment due to their disinfectant and oxidation properties. However, these oxidationprocesses can induce refractory transformation products. In this context, the objective of this work was to study the fate of three commonly used pharmaceuticals (metronidazole, paracetamol and levofloxacin) during oxidation with chlorine, ozone and hydroxyl radicals. First, a kinetic study was conducted at pH 7.2 and 20°C and rate constants were determined. For each pharmaceutical, different rates of degradation were observed depending on oxidation process. To better assess pharmaceutical removal under water treatment conditions, an estimation of pharmaceutical removal under several oxidation conditions (i.e.oxidant concentrations, contact time, water quality) was undertaken. In a second part, numerous transformation products were identified by LC/MS and LC/MS/MS and reactional pathways were suggested. Finally, monitoring of the toxicity (luminescence inhibition of Vibrio fisheri) were performed and compared to the formation of by-products. An increase in toxicity was observed for each oxidation process and pharmaceutical tested for the smallest oxidant doses
Fakih, Mariam. "Réactivité atmosphérique des principaux produits d'oxydation de première génération des monoterpènes." Electronic Thesis or Diss., Reims, 2024. http://www.theses.fr/2024REIMS010.
Повний текст джерелаMonoterpenes are biogenic volatile organic compounds (BVOCs) widely emitted into the atmosphere by forests and plant crops, thus representing significant players in atmospheric chemistry. Their high reactivity towards atmospheric oxidants has been the subject of several studies in the literature. However, their first-generation oxidation products are less evaluated, and could partly explain the missing reactivity and the underestimation of AOS formation by models. In this context, this study aims to understand the atmospheric reactivity of five VOCBs (nopinone, myrtenal, ketolimonene, caronaldehyde, and limononaldehyde) that are first-generation oxidation products of α- and β-pinene and limonene. This work focuses on the study of degradation processes by determining the kinetics and mechanism of oxidation reactions of the targeted BVOCs by the OH radical, chlorine and ozone, as well as their potential photolysis through the study of their UV-Vis absorption spectra. To this end, the oxidation reactions of five first-generation monoterpene oxidation products were studied in an atmospheric simulation chamber coupled with various analytical techniques (FTIR, SPME-GC/MS, PTR-MS-ToF).The spectroscopic study focused on determining the UV-visible absorption spectra of the five compounds in the 200-400 nm range at a temperature of 353 ± 2 K, and at a pressure below the saturation vapor pressure of COVB. The spectra show a broad absorption band between 240 and 370 nm, corresponding to the n-π* band of the carbonyl group. The significant absorption of these compounds above 290 nm suggests that they are likely to be removed by photolysis in at least a few hours.The temperature kinetic studies carried out in this thesis concern the (VOC+ OH) reaction for nopinone, myrtenal, ketolimonene and limononaldehdye, the (VOC + Cl) reaction for nopinone, myrtenal and ketolimonene and the ozonolysis reaction for ketolimonene, myrtenal and limononaldehyde. Experiments were carried out using either the relative or the absolute kinetic method in the temperature range 298 - 353 K and at atmospheric pressure. The kinetic results obtained made it possible to calculate the atmospheric lifetimes of these compounds. Their atmospheric persistence does not exceed one day. Overall, these lifetimes show that the main route of elimination for the compounds studied is through their reaction with OH radicals, with significant competition in coastal regions from Cl radicals. The study also revealed a generally positive trend for OH radicals and ozone with increasing temperature, and a negative trend for chlorine.Finally, mechanistic ozonolysis studies of ketolimonene, myrtenal and limononaldehyde were carried out. These studies consist of monitoring the temporal evolution of the reagents as well as the reaction product. These data allowed us to extract the formation rate of the products formed during ozonolysis processes. Based on these results, reaction mechanisms of ozonolysis of ketolimonene, myrtenal and limononaldehyde are proposed
Lendar, Maria. "Dégradation atmosphérique d’une série d’alcools, d’esters et de l’hexafluoroisobutène." Thesis, Orléans, 2012. http://www.theses.fr/2012ORLE2042/document.
Повний текст джерелаIn this thesis we report the atmospheric fate of three saturated alcohols: CH3(CH2)4OH, CH3CH2CH2CH(OH)CH3 and (C2H5)2CHOH, three esters: CH3CH2CH2C(O)OC2H5, CH3CH2COOC2H5 and CH3CH2COOCH2CH2CH3 and an unsaturated HFC with OH radicals and Cl atoms. The rate coefficients of OH reactions with these compounds have been measured over the temperature range 253 – 373 K, using the Pulsed Laser Photolysis – Laser Induced Fluorescence technique (PLP-LIF). Moreover the rate coefficients of OH and Cl reactions with alcohols, esters and hexafluoroisobutene (HFIB) have been determined at room temperature, using smog chambers. For the reaction of OH radicals with HFIB and Cl atoms with esters and HFIB, the rate coefficients obtained in this study present the first determination. The results have been compared with the literature and the reactivity of the compounds has been discussed. Finally, the atmospheric lifetimes of these compounds have been determined and the OH oxidation products have been identified, which allows us to estimate the atmospheric impact of these compounds
Miet, Killian. "Etude expérimentale de la dégradation hétérogène des Composés Aromatiques Polycycliques (CAP) d'intérêt troposphérique." Phd thesis, Bordeaux 1, 2008. http://tel.archives-ouvertes.fr/tel-00424794.
Повний текст джерелаZogka, Antonia. "Atmospheric degradation of a series of methoxy and ethoxy acetates and n-pentyl acetate." Thesis, Orléans, 2016. http://www.theses.fr/2016ORLE2071/document.
Повний текст джерелаIn the context of DISPATMO project (forecast study of pollution risks related to the atmospheric dispersal of chemicals), risk studies linked to the fires and the explosions due to chemical storage were conducted. The purpose of this thesis was to perform a thorough kinetic and mechanistic study to determine the gas phase degradation of one of the main component of Tiflex solvent, the 1-methoxy 2-propyl acetate (MPA). Furthermore, the rate coefficients of OH and Cl with a series of alkoxy acetates widely used in painting and coating industries, 2-methoxy-butyl acetate (2MBA), 3-methoxybutyl acetate (3MBA), methoxy ethyl acetate (MEA), ethoxy ethyl acetate (EEA) and n-pentyl acetate (n-PA), were determined. The experiments were performed employing the pulsed laser photolysislaser induced fluorescence technique, a low pressure flow tube reactor coupled with a quadrupole mass spectrometer and an atmospheric simulation chamber coupled with a GC-FID, a FTIR and a GC-MS using complementary absolute and relative rate methods. The kinetic data were used to derive the Arrhenius expressions as well as to evaluate the environmental fate of the studied compounds such as their lifetimes and the Photochemical Ozone Creation Potential. Besides, the reaction mechanism was investigated, while the major degradation products and their yields were determined in presence of NO. In addition, the UV-Vis absorption cross sections of MPA, 2MBA and 3MBA were measured in order to evaluate their potential photolysis in the atmosphere. The investigation of the chemical processes and the tropospheric lifetimes of the compounds are used as input data in photochemical atmospheric simulation models and in chemical agent atmospheric dispersion models to evaluate their atmospheric impact
Частини книг з теми "Hydroxyle radical. Chlore. Ozone"
Basumatary, Moumita, Shilpa Neog, Srutishree Sarma, Nand Kishor Gour, and Ramesh Chandra Deka. "A REVIEW ON PERVASIVE ATMOSPHERIC CHEMISTRY OF VOLATILE ORGANIC ACIDS." In Futuristic Trends in Chemical Material Sciences & Nano Technology Volume 3 Book 15, 89–102. Iterative International Publishers, Selfypage Developers Pvt Ltd, 2024. http://dx.doi.org/10.58532/v3becs15p4ch5.
Повний текст джерелаТези доповідей конференцій з теми "Hydroxyle radical. Chlore. Ozone"
Hudgens, Jeffrey W., Jeffrey L. Brum, Russell D. Johnson, and David V. Dearden. "Structure Matters: Detection of Difluoromethyl and Difluoroethyl Radicals by Resonance Enhanced Multiphoton Ionization Spectroscopy." In Laser Applications to Chemical Analysis. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/laca.1994.fa.4.
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