The photo-Fenton reaction — an effective photochemical wastewater treatment process

Ruppert, Gerald; Bauer, R.; Heisler, G.

doi:10.1016/1010-6030(93)80035-8

Cited by 335 publications

(158 citation statements)

References 9 publications

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“…Under light irradiation, the additional generation OH • -radicals improve the kinetics of the Orange II mineralization (20) as reported earlier for Fenton systems [7,26]. A TOC reduction from 34 to 15 mg C/l (Fig.…”

Section: Influence Of the Gas Atmosphere On The Orange II Mineralizatmentioning

confidence: 51%

“…The dissolved oxygen seems to play an active role leading to peroxy-radicals, ROO • (R = H, alkyl, aryl) [24][25][26] and peroxy-radicals serve as chain propagators and oxidize organic materials either by hydrogen abstraction or electron transfer process [28][29][30]. Under light irradiation, the additional generation OH • -radicals improve the kinetics of the Orange II mineralization (20) as reported earlier for Fenton systems [7,26].…”

Section: Influence Of the Gas Atmosphere On The Orange II Mineralizatmentioning

confidence: 76%

“…The oxidation potential 1.82 eV of oxone is slightly higher than the oxidation potential of 1.80 eV of the couple Co 3+ /Co 2+ suggesting that a low overpotential is able to drive the reaction to Co 3+ from the initial Co 2+ -ion upon oxone addition in solution. The oxidation of Co 2+ by oxone to the unstable Co 3+ due to its high reactivity in an aqueous solution has been reported [18,19,25,26]. Solutions of Co 3+ -ions have also been prepared by electrochemical oxidation of Co 2+ [19,20].…”

Section: Introductionmentioning

confidence: 99%

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Bleaching and photobleaching of Orange II within seconds by the oxone/Co2+ reagent in Fenton-like processes

Fernández

Maruthamuthu

Renken

et al. 2004

Applied Catalysis B: Environmental

125

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Accelerated bleaching, photobleaching and mineralization of the non-biodegradable azo-dye, Orange II, was observed with oxone in solutions with Co 2+ -ions. The bleaching rate of Orange II in the dark was found to follow a first-order kinetics with respect to [Co 2+ ] with a rate constant of 20 M −1 s −1 . Fitting of the Orange II photobleaching experimental points in the presence of the Co 2+ /oxone reagent was carried out and followed the trend known for reactions presenting a chain radical branched mechanism. The photobleaching trace could be fitted by a single mathematical expression with an error <5% with respect to the experimental data. The bleaching trace observed for the Orange II solution in the dark followed zero-order decay kinetics. In a typical run, Orange II (0.20 mM or TOC 30 mg C/l) in the presence of oxone and Co 2+ was bleached under visible light within ∼15 s. The Co 2+ -ion concentrations necessary to catalyze the Orange II mineralization by oxone was observed to be ∼100 times lower than the oxone concentration. A 100% TOC decrease, under visible light irradiation, was attained for an Orange II (0.2 mM) solution in the presence of Co 2+ -ions (0.06 mM) and oxone (20 mM) within times ∼70 min for solutions purged with oxygen. Under visible light irradiation, Orange II mineralization in the presence of O 2 involves the photo-dissociation of reaction intermediates leading to organic peroxides in the second step of the mineralization process.

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Section: Influence Of the Gas Atmosphere On The Orange II Mineralizatmentioning

confidence: 51%

Section: Influence Of the Gas Atmosphere On The Orange II Mineralizatmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

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Bleaching and photobleaching of Orange II within seconds by the oxone/Co2+ reagent in Fenton-like processes

Fernández

Maruthamuthu

Renken

et al. 2004

Applied Catalysis B: Environmental

125

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“…OH under photo-Fenton conditions. The degradation rate of organic compounds can be strongly accelerated by irradiation with ultraviolet light (Ruppert and Bauer, 1993;Fukushima et al, 2000). The increased efficiency of the photo-Fenton is attributable to the photo-reduction of the Fe 3+ formed during the Fenton process.…”

Section: Comparison Of the Catalytic Activity Of Four Metal Ions Undementioning

confidence: 99%

Degradation of dyes in aqueous solutions by the Fenton process

Wang

et al. 2004

Chemosphere

167

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“…Most of them are based on the production of hydroxyl radicals that react readily and decompose most organic species. 12 These processes are generally based on oxidative degradation reactions initiated by hydroxyl radicals generated by several methods, like UV photolysis of hydrogen peroxide, TiO 2 photocatalysis, vacuum ultraviolet (VUV) photolysis of water, Fenton and photo-Fenton reactions. 13 One way to generate HO…”

Section: Introductionmentioning

confidence: 99%

Photo-fenton degradation of poly(Ethyleneglycol)

Santos

Cavalheiro

Poli

et al. 2011

J. Braz. Chem. Soc.

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Polietilenoglicol (PEG) foi fotooxidado usando o sistema foto-Fenton e comparando com a reação no escuro. Os produtos foram analisados por GPC e HPLC. As amostras tratadas na ausência de luz necessitaram 490 min para que a -M w decrescesse em 50%, enquanto que sob irradiação UV essa mesma proporção foi obtida em 10 min. O decaimento exponencial de -M w com um concomitante aumento na polidispersividade e o número de quebras de cadeia caracteriza um mecanismo de quebra de cadeia aleatório. Os produtos da degradação de PEG em ambos os casos mostram a presença de produtos de massa molecular menor, incluindo etilenoglicóis menores e o ácido fórmico. O mecanismo da fotodegradação corresponde a processos consecutivos, onde etilenoglicóis de maior massa molar geram outros de menor massa, envolvendo quebras sucessivas das cadeias do polímero. O estudo demonstra que o processo de foto-Fenton com irradiação UV é um bom método para a decomposição de PEG.Polyethyleneglycol (PEG) was photooxidized in a photo-Fenton system and results compared with the dark reaction. The products were analysed using GPC and HPLC. In the absence of light, PEG samples needed 490 min to reduce their -M w by 50%, whereas under UV irradiation, only 10 min were necessary. The exponential decay of -M w with a concomitant increase in polydispersity and number of average chain scission, characterized a random chain scission mechanism. The degradation products of PEG in both systems showed the presence of lower molecular weight products, including smaller ethyleneglycols and formic acid. The mechanism involves consecutive processes, were the larger ethyleneglycols give rise, successively, to smaller ones. This suggests that the mechanism involves successive scissions of the polymer chain. Irradiated samples decomposed faster than those kept in the dark This study proves that the foto-Fenton method associated with UV-light is a good reactant for PEG photodegradation.

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The photo-Fenton reaction — an effective photochemical wastewater treatment process

Cited by 335 publications

References 9 publications

Bleaching and photobleaching of Orange II within seconds by the oxone/Co2+ reagent in Fenton-like processes

Bleaching and photobleaching of Orange II within seconds by the oxone/Co2+ reagent in Fenton-like processes

Degradation of dyes in aqueous solutions by the Fenton process

Photo-fenton degradation of poly(Ethyleneglycol)

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