Utilisation du rayonnement ultraviolet dans le traitement des eaux: mesure du flux photonique par actinometrie chimique au peroxyde d'hydrogene

Nicole, I.; Laat, J. De; Doré, M.; Duguet, J.P.; Bonnel, C.

doi:10.1016/0043-1354(90)90098-q

Cited by 258 publications

(60 citation statements)

References 14 publications

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“…The eluent was a mixture of methanol/water (50/50 v/v). Hydrogen peroxide was measured either by iodometric method or by complexometry with TiCl 4 according to the concentration range (Nicole et al 1990). HPLC-mass spectrometry (MS) experiments were conducted by the Service Central d'Analyses of CNRS (Solaize France).…”

Section: Methodsmentioning

confidence: 99%

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Degradation of carbendazim by UV/H 2 O 2 investigated by kinetic modelling

Mazellier

Leroy

Laat

et al. 2003

Environmental Chemistry Letters

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The transformation of the fungicide carbendazim (methyl-2 benzimidazole carbamate) induced by hydroxyl radical generated by the UV photolysis of H 2 O 2 has been studied in dilute aqueous solution. The efficient reaction of hydroxyl radicals with carbendazim led to the rapid degradation of carbendazim. The study of reaction kinetics yielded a second order rate constant of 2.2±0.3 10 9 M −1 s −1 for HO · radicals with carbendazim. This value is in agreement with a high reactivity of HO · radicals with carbendazim. Most degradation products were identified by high performance liquid chromatography mass spectrometry (HPLC-MS). In the presence of hydrogenocarbonate and carbonate ions, hydroxyl radicals were quenched and in turn carbonate radicals CO 3 ·− were formed. Carbonate radicals are indeed known to react efficiently with compounds containing electron-rich sites such as nitrogen or sulfur atoms. The use of a kinetic modelling software gave evidence for the occurrence of such reactions with carbendazim. The second order rate constant of carbonate radical with carbendazim was equal to 6±2 10 6 M −1 s −1 .

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Section: Methodsmentioning

confidence: 99%

“…The Heraeus low pressure mercury lamp NN 40/20 was located at the centre of the reactor, in a quartz sleeve. The number of photons was evaluated with hydrogen peroxide actinometry as described elsewhere (Nicole et al 1990). Actinometries were performed weekly.…”

Section: Methodsmentioning

confidence: 99%

Degradation of carbendazim by UV/H 2 O 2 investigated by kinetic modelling

Mazellier

Leroy

Laat

et al. 2003

Environmental Chemistry Letters

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“…The hydroxylamine hydrochloride method of Smith [13] was used to estimate the total carbonyl contents of the sample. The H 2 O 2 concentration in the slurry before, during and after the oxidation reaction was determined according to colorimetric methods previously used by Nicole et al [14].…”

Section: Oxidation Of Starchmentioning

confidence: 99%

Reaction and Mass Transfer Kinetics Model of Hydrogen Peroxide Oxidation of Starch under Influence of Ultraviolet Irradiation

Kumoro

Ratnawati

Retnowati

2017

Period. Polytech. Chem. Eng.

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“…Reactions (2) and (3) are of minor importance since UV absorption coefficient of hydrogen peroxide is small [22] and the rate constant of H 2 O 2 dissociation is low [23]. The ionic form of hydrogen peroxide arises also in the reaction of ozone with hydroxyl anion:…”

Section: The Kinetic Study the Degradation Of Pahsmentioning

confidence: 99%

Oxidation of PAHs in water solution by ozone combined with ultraviolet radiation

Miller¹,

Olejnik²

2001

International Journal of Photoenergy

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Abstract. The oxidation of three polycyclic aromatic hydrocarbons (PAHs): benzo[a]pyrene (BAP), chrysene (CHR) and fluorene (FLU) in aqueous solution using ozone assisted by UV radiation was investigated. The influence of pH of the reaction mixture, ozone concentration and the presence of a radical scavenger on the reaction rate was determined. The highest rate of PAHs disappearance was achieved in acidic solutions. The radical scavenger-tert -butanol, effectively inhibited the rate of BAP and CHR destruction but had a slight influence in the case of FLU. The rate constants of direct reaction of PAHs with ozone were calculated using our earlier investigations and they were equal to 6.8 × 10 4 ; 6.9 × 10 3 and 62 M −1 s −1 for BAP, CHR and FLU, respectively. The contributions of direct ozonolysis, photolysis and radical reaction to PAHs oxidation in O 3 /UV system were evaluated.

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Utilisation du rayonnement ultraviolet dans le traitement des eaux: mesure du flux photonique par actinometrie chimique au peroxyde d'hydrogene

Cited by 258 publications

References 14 publications

Degradation of carbendazim by UV/H 2 O 2 investigated by kinetic modelling

Degradation of carbendazim by UV/H 2 O 2 investigated by kinetic modelling

Reaction and Mass Transfer Kinetics Model of Hydrogen Peroxide Oxidation of Starch under Influence of Ultraviolet Irradiation

Oxidation of PAHs in water solution by ozone combined with ultraviolet radiation

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