Photocatalytic oxidation of the herbicide (4-chloro-2-methylphenoxy)acetic acid (MCPA) over TiO2

Topalov, A.S.; Abramović, Biljana F.; Molnár-Gábor, Dóra; Csanádi, János; Arcson, Otto N.

doi:10.1016/s1010-6030(01)00415-4

Cited by 82 publications

(31 citation statements)

References 13 publications

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“…Nevertheless, the chemical shifts characteristic of MCPA molecule obtained in CD 3 OD are quite similar to that found in literature using D 2 O. [17] …”

Section: Nuclear Magnetic Resonance Studiessupporting

confidence: 88%

Host-guest complexes of phenoxy alkyl acid herbicides and cyclodextrins. MCPA and β-cyclodextrin

Garrido

Santos

Silva³

et al. 2012

Journal of Environmental Science and Health, Part B

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The chlorophenoxy herbicide MCPA (4-chloro-2-methylphenoxyacetic acid), widely used for the control of broad-leaf weeds primarily in cereal and grass seed crops, still remains one of the most often used herbicides in Portugal. As the formation of inclusion complexes with cyclodextrins can improve its solubility properties, the interaction between the herbicide MCPA and β-cyclodextrin was investigated. The stability constants describing the extent of formation of the complexes have been determined by phase-solubility studies. Different analytical techniques [ultraviolet-visible spectroscopy (UV-Vis), differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance spectroscopy ( 1 H NMR)] were employed for a thorough investigation of the structural characteristics of the obtained complexes, which exhibited distinct features and properties from both "guest" and "host" molecules. FTIR and 1 H NMR data obtained for the MCPA/β-CD complexes gave information about the interaction between MCPA and the nonpolar cyclodextrin cavity. The dramatic change observed in band frequency and proton displacements of OCH 2 group and H6 aromatic proton confirmed the inclusion of MCPA in β-CD.The formation of an inclusion complex between MCPA and β-CD increased the aqueous solubility of this herbicide which could be a particularly advantageous property for some specific applications, namely to improve commercial formulation and for environmental protection.

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“…Nevertheless, the chemical shifts characteristic of MCPA molecule obtained in CD 3 OD are quite similar to that found in literature using D 2 O. [17] …”

Section: Nuclear Magnetic Resonance Studiessupporting

confidence: 88%

Host-guest complexes of phenoxy alkyl acid herbicides and cyclodextrins. MCPA and β-cyclodextrin

Garrido

Santos

Silva³

et al. 2012

Journal of Environmental Science and Health, Part B

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“…7, curve #6). It could be due to the release of chloride (as H + Cl − ) being faster than that of ammonium, the latter consuming H + [31] (compare curves #2 -chloride-and #3 -ammonium-in Fig. 7).…”

Section: Evaluation Of the Degree Of Mineralizationmentioning

confidence: 99%

A comparative study of the activity of TiO2 Wackherr and Degussa P25 in the photocatalytic degradation of picloram

Abramović

Šojić

Despotović

et al. 2011

Applied Catalysis B: Environmental

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“…Co-immobilization of m-peroxo-bis[N,N9-15 h of irradiation the mineralization was complete. As in ethylene-bis(salicylideneiminato)dimethylformamide cobalt the case of mecoprop, the proposed pathway of MCPA (III)] and of a mixture of tri-(t-butyl)-and tri-(i-prophotodegradation in the presence of TiO also involves the 2 pyl)vanadate (V) led to rate enhancements of, respectively, formation of radicals [230].…”

Section: Factors Tion Of Methyl Parathion Hoo-dimethyl O-4-nitrophenylmentioning

confidence: 99%

Reaction pathways and mechanisms of photodegradation of pesticides

Burrows

Santaballa

Steenken

2002

Journal of Photochemistry and Photobiology B: Biology

563

286

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The photodegradation of pesticides is reviewed, with particular reference to the studies that describe the mechanisms of the processes involved, the nature of reactive intermediates and final products. Potential use of photochemical processes in advanced oxidation methods for water treatment is also discussed. Processes considered include direct photolysis leading to homolysis or heterolysis of the pesticide, photosensitized photodegradation by singlet oxygen and a variety of metal complexes, photolysis in heterogeneous media and degradation by reaction with intermediates generated by photolytic or radiolytic means.

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Photocatalytic oxidation of the herbicide (4-chloro-2-methylphenoxy)acetic acid (MCPA) over TiO2

Cited by 82 publications

References 13 publications

Host-guest complexes of phenoxy alkyl acid herbicides and cyclodextrins. MCPA and β-cyclodextrin

Host-guest complexes of phenoxy alkyl acid herbicides and cyclodextrins. MCPA and β-cyclodextrin

A comparative study of the activity of TiO2 Wackherr and Degussa P25 in the photocatalytic degradation of picloram

Reaction pathways and mechanisms of photodegradation of pesticides

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