Electrochemical degradation of the herbicide 4-chloro-2-methylphenoxyacetic acid in aqueous medium by peroxi-coagulation and photoperoxi-coagulation

Boye, Birame; Brillas, Enric; Dieng, Momar Morième

doi:10.1016/s0022-0728(02)01271-8

Cited by 55 publications

(46 citation statements)

References 39 publications

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“…The peroxi-coagulation method has been used for electrochemical degradation of 4-chlorophenol [27], aniline [28], chlorophenoxy and chlorobenzoic herbicides [23], 4-chlorophenoxyacetic acid [29], 2,4,5-trichlorophenoxyacetic acid [30], 4-chloro-2-methylphenoxyacetic acid [31], vegetal tannins [32] and gallic acid [33].…”

Section: Introductionmentioning

confidence: 99%

Peroxi-coagulation degradation of C.I. Basic Yellow 2 based on carbon-PTFE and carbon nanotube-PTFE electrodes as cathode

Zarei

Salari

Niaei

et al. 2009

Electrochimica Acta

162

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Section: Introductionmentioning

confidence: 99%

Peroxi-coagulation degradation of C.I. Basic Yellow 2 based on carbon-PTFE and carbon nanotube-PTFE electrodes as cathode

Zarei

Salari

Niaei

et al. 2009

Electrochimica Acta

162

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“…Oxalic acid is in fact a substrate generally detected during the degradation of organic substrates via the electro-Fenton process [26][27][28].…”

Section: Real Wastewatermentioning

confidence: 99%

“…The red precipitate obtained after electrocoagulation with the iron anode (80 g l )1 of wastewater) contained about 50% of Fe and only 0.65% of organic carbon, and was composed of Fe(III) oxides, mainly in their goethite form and, in some instances, of ferro-oxalate complexes [26][27][28]. This means that the organic part of the Fe-tannin precipitates obtained in the first steps of the electrolyses is oxidised via the Fenton process.…”

Section: Real Wastewatermentioning

confidence: 99%

“…Independently of this non-insurmountable barrier, works have been reported concerning removals of up to 99% COD by short-time electrolysis [21][22][23][24][25]. Peroxicoagulation using iron as sacrificial anode coupled with an O 2 -diffusion cathode has shown good efficiency in removing herbicides from aqueous solutions [26][27][28]. The same iron used as cathode allows the total elimination of ammonia, with appreciable COD reduction [25].…”

Section: Introductionmentioning

confidence: 99%

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Removal of vegetal tannins from wastewater by electroprecipitation combinedwith electrogenerated Fenton oxidation

et al. 2005

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Synthetic solutions containing up to 2000 ppm of gallotannic acid and real wastewater from vegetal tanning processes with values of chemical oxygen demand (COD) exceeding 100 000 ppm were decontaminated by electrolysis using a sacrificial iron anode coupled to either a titanium-platinised or an O 2 -diffusion cathode. Experiments were performed in the presence of oxidants and oxidation promoters such as air, oxygen and hydrogen peroxide, the latter being directly added to the solution or electrogenerated by the O 2 -diffusion cathode. COD and UV-visible absorbance evolution showed that tannins are removed from electrolysed solutions down to relatively low values, permitting more than 94% elimination. Partial oxidation of the mother compound generates short-chain by-products (mostly carboxylic acids) responsible for the remaining low COD values. Contaminants (tannins and non-tannins) contained in industrial wastewater were removed by combining electroprecipitation with a Fentonassisted process; a final oxidation step, carried out on a boron-doped diamond electrode, was performed in order to decrease the COD to very low final values.

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“…However, their major inconvenient consists in the fact that the pollutants are slowly transformed into hardly degradable carboxylic compounds that remain in the treated solutions for many time. Recent techniques on carbon-based materials [10][11][12][13] have given high-performances electrodes that permit to eliminate contaminants from aqueous solutions even at trace concentrations. In the ultimate times, the use of boron-doped thin-film layer diamond, which is characterized by extreme stability and mechanical resistance, is largely related as anode in the field of water treatment.…”

Section: Introductionmentioning

confidence: 99%

<b>Electrochemical decontamination of waters by advanced oxidation processes (aops): case of the mineralization of 2,4,5-t on bdd electrode</b>

Boye

Brillas

Marselli

et al. 2004

Bull. Chem. Soc. Eth.

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ABSTRACT. In the present work, herbicide 2,4,5-trichlorophenoxyacetic acid, more commonly known as 2,4,5-T herbicide, has been completely mineralized (i.e. transformed into CO 2 and H 2 O) in saturated aqueous solutions using a semi-industrial electrochemical cell that contains a boron doped diamond anode and a zirconium cathode. We have performed cyclic voltammetry, chronoamperometry and bulk electrolysis to give the optimization characteristics of the degradation of such a compound and its by-products. Bulk electrolysis in the potential region of electrolyte decomposition leads to the complete destruction of 2,4,5-T and its degradation intermediates by means of the electrogeneration of the highly reactive hydroxyl radicals. The evolution of the chemical oxygen demand (COD) and the instant current efficiency (ICE) during the degradation process is perfectly predicted by a theoretical mathematical model. HPLC and GC-MS have also been performed to highlight the evolution of the mother product and its degradation intermediates. Kinetic analysis of the obtained results has shown a fast destruction of the mother herbicide asserting a diffusion-controlled process. 2,4,5-trichlorophenol and quinonebased organic compounds have been depicted as aromatic intermediates, all of them transformed into short chains carboxylic acids before complete mineralization happens.

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Electrochemical degradation of the herbicide 4-chloro-2-methylphenoxyacetic acid in aqueous medium by peroxi-coagulation and photoperoxi-coagulation

Cited by 55 publications

References 39 publications

Peroxi-coagulation degradation of C.I. Basic Yellow 2 based on carbon-PTFE and carbon nanotube-PTFE electrodes as cathode

Peroxi-coagulation degradation of C.I. Basic Yellow 2 based on carbon-PTFE and carbon nanotube-PTFE electrodes as cathode

Removal of vegetal tannins from wastewater by electroprecipitation combinedwith electrogenerated Fenton oxidation

<b>Electrochemical decontamination of waters by advanced oxidation processes (aops): case of the mineralization of 2,4,5-t on bdd electrode</b>

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