Kinetics and reactional pathway of Imazapyr photocatalytic degradation Influence of pH and metallic ions

Carrier, Marion; Perol, N.; Herrmann, Jean-Marie; Bordes, Claire; Horikoshi, Satoshi; Paisse, Jean Olivier; Baudot, Robert; Guillard, C.

doi:10.1016/j.apcatb.2005.11.014

Cited by 61 publications

(66 citation statements)

References 37 publications

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“…ions (100-500 mg L -1 ) show that a complex is formed between the two species as would be expected because of the known interaction between copper and carboxylate groups [19,20]. It has also been confirmed that the degradation of 2,4,5-T in the presence of Fe(II) ions produced Fe(III)-oxalato complex [3] and the complex formation of this type must alter the susceptibility of the organic molecule to photolytic degradation.…”

Section: Effect Of Cu(ii) Ionsmentioning

confidence: 70%

“…It has been reported [8,9,19] This decrease in the percentage degradation of 2,4,5-T is probably due to a complex 11 formation between Cu(II) ions and the organic species or some of the intermediate products.…”

Section: Effect Of Cu(ii) Ionsmentioning

confidence: 99%

“…2b). It has been reported [19] that the recombination of electron/hole pairs, in the presence TiO 2 suspension, is an interfering reaction which, in the absence of appropriate electron acceptor or donor, is very efficient and will ultimately reduce the degradation of organic contaminant. To overcome the recombination of the electron/hole (e -/h + ) pairs, the effect of H 2 O 2 as an electron acceptor, in addition to air, in the presence of TiO 2 suspension was investigated.…”

Section: Effect Of Cu(ii) Ionsmentioning

confidence: 99%

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Simultaneous recovery of metals and degradation of organic species: Copper and 2,4,5-trichlorophenoxyacetic acid (2,4,5-T)

Chaudhary

Hassan

Grimes

2009

Journal of Hazardous Materials

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In mixed wastewater streams, the presence of metal ions can retard the destruction of organic contaminants and the efficiency of recovery of the metal is reduced by the presence of organic species. The reduction in the efficiency of these methods is due to the formation of complexes between the organic species and the metal ions in solution. Results are presented for copper -2,4,5-T system in which both effects occur. A photolytic cell alone can achieve the complete degradation of 2,4,5-T, in the presence of TiO 2 or H 2 O 2 , at pH 3.5. The addition of Cu(II) ions, however, retard the degradation of 2,4,5-T and complete mineralization of 2,4,5-T was not achieved and the system also leaves Cu(II) ions in solution. An electrolytic cell alone can be used to recover copper in pH range 1.5 -4.5 but is not capable of achieving complete disappearance of 2,4,5-T by anodic oxidation. A combined photolytic -electrolytic system is capable of achieving simultaneous destruction of 2,4,5-T and recovery of copper from mixed wastewater streams at pH 3.5. The percentage destruction of 2,4,5-T and the recovery of copper can be increased further by using a combined photolytic and an activated carbon concentrator cell system. This system can achieve the simultaneous recovery of copper and the degradation of 2,4,5-T without the use of an additional oxidants or catalysts.

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Section: Effect Of Cu(ii) Ionsmentioning

confidence: 70%

Section: Effect Of Cu(ii) Ionsmentioning

confidence: 99%

Section: Effect Of Cu(ii) Ionsmentioning

confidence: 99%

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Simultaneous recovery of metals and degradation of organic species: Copper and 2,4,5-trichlorophenoxyacetic acid (2,4,5-T)

Chaudhary

Hassan

Grimes

2009

Journal of Hazardous Materials

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“…L'absorption de cette lumière par ces substances induit une grande variété de processus photochimiques (Khan et al, 1980;François et al, 2004;Feigenbrugel et al, 2006;Le Person et al, 2007). Plusieurs espèces ont été suggérées dans la littérature dont les radicaux hydroxyles, les états excités triplet et les oxygènes singulet (Cooper et al, 1989;Aguer et al, 2005;Whelan et al, 2004 ;VanLoon et al, 2005;Carrier et al, 2006;Fleming et al, 2006).…”

Section: Introductionunclassified

Etude des capacités photodégradantes des substances humiques naturelles extraites de deux sols cultivables du Togo

Koriko¹,

Zonvide²,

Tchangbédji³

et al. 2011

International Journal of Biological and Chemical Sciences

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RESUMESous l'effet de la lumière, les substances humiques peuvent avoir des aptitudes à dégrader les polluants organiques. Il peut se former ainsi des états excités, des oxygènes singulet ( 1 O 2 ), des radicaux peroxyde (RO 2 . ), (HO 2 . /O 2 .-) et hydroxyle (OH . ) ou encore des électrons solvatés (e -aq ) intervenant dans la dégradation des polluants organiques. Ces réactions interviennent dans l'environnement aquatique et à la surface des sols. Au cours de cette étude, nous nous sommes intéressés aux propriétés photodégradantes des acides humiques extraits de deux sols cultivables du Togo. A cet effet, nous avons utilisé les solutions aqueuses d'un tampon phosphate à pH = 6,5. L'objectif de ce travail a été donc, d'évaluer et de comprendre les propriétés photosensibilisatrices des acides humiques et notamment les rôles de quelques espèces réactives. La première étape de cette étude fut la réactivité photochimique des acides humiques avec une molécule modèle (2,6-diméthylphénol). La deuxième étape a consisté à utiliser le 2,4,6-triméthylphénol pour caractériser des états excités à caractère triplet ; l'acide téréphtalique pour la mise en évidence des radicaux hydroxyles et l'alcool furfurylique pour caractériser les oxygènes singulet. Le 2,6-diméthylphénol utilisé comme molécule modèle nous a prouvé les capacités photodégradantes de ces substances humiques. L'utilisation des molécules sondes a montré la formation des espèces réactives comme les oxygènes singulet, les états excités à caractère triplet et les radicaux hydroxyles. D'autres espèces pourraient être présentes.

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“…10,11 In both mechanisms, redox reactions occur as well as adsorption processes with metal ions in the soil. 3,4 Most studies on the degradation of pesticides are based on photochemical 12 and microbial 11 processes, although some authors have presented electrochemical degradation methods ͑via oxidation, in most cases͒ in an extensive range of organic molecules 13 including several pesticides. 14 Although the reduction of the CvN double bond has been extensively studied, 15,16 the information that was published on the electrochemical behavior of this group in imidazolinone compounds is very limited.…”

mentioning

confidence: 99%

Stereoselective Electrochemical Reduction of Imazapyr in Aqueous Media Without Chiral Auxiliaries

Mozo

López‐López

Olloqui‐Sariego

et al. 2010

J. Electrochem. Soc.

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The electrochemical reduction of imazapyr at the static mercury drop electrode was studied by cyclic voltammetry as a function of pH in aqueous buffered media. The process leads to the 2,3-CvN double bond reduction in the imidazoline moiety in all media. The products have been isolated by controlled-potential electrolyses and identified by high performance liquid chromatography-tandem mass spectrometry measurements and 1 H-NMR, 13C-NMR, and IR spectra. Although no chiral auxiliary was used, a moderate diasteroisomeric excess was observed. The diasteromeric ratio depends on pH of the electrolyses.

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Kinetics and reactional pathway of Imazapyr photocatalytic degradation Influence of pH and metallic ions

Cited by 61 publications

References 37 publications

Simultaneous recovery of metals and degradation of organic species: Copper and 2,4,5-trichlorophenoxyacetic acid (2,4,5-T)

Simultaneous recovery of metals and degradation of organic species: Copper and 2,4,5-trichlorophenoxyacetic acid (2,4,5-T)

Etude des capacités photodégradantes des substances humiques naturelles extraites de deux sols cultivables du Togo

Stereoselective Electrochemical Reduction of Imazapyr in Aqueous Media Without Chiral Auxiliaries

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