The system design of UV-assisted catalytic oxidation process––degradation of 2,4-D

Chu, Wei; Chan, K. H.; Kwan, C. Y.; Lee, C. K. M.

doi:10.1016/j.chemosphere.2004.06.008

Cited by 12 publications

(6 citation statements)

References 24 publications

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“…In the process of catalytic decomposition of H2O2 by Fe (III) ions, Fe 2+ is produced by the catalytic decomposition of H2O2 by Fe 3+ , and then the organic molecules are oxidized by the•OH from the reaction of Fe 2+ and H2O2 [14]. Barb et al (1951) and Walling and Weil (1974) [15], produced early reports of the catalytic mechanism of reaction. Subsequently, the degradation of organic matter by Fe (III)/H2O2 has been of great interest [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

The Application of Fluorescence Spectroscopy for the Investigation of Dye Degradation by Chemical Oxidation

et al. 2020

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Chemical oxidation is a key technique used in dye wastewater treatment via the formation of hydroxyl radicals.To obtain optimal treatment effects, it is critical to understand the interaction of the molecular structure of the dye with the hydroxyl radical. We evaluated fluorescence excitation-emission matrix spectroscopy to study the decay of an azo-dye (Procion Red MX-5B) by a hydroxyl radical generated from catalytic Fe (III) on H2O2. Results showed that fluorescence signal reliably indicated the variations of the chemical groups and components during degradation, and the degradation could be divided into three stages: initial degradation (decolorisation), rapid intermediate degradation, and final degradation. Under control of uncorrected matrix correlation, the fluorescence fractions could be fitted successfully by parallel factor model (PARAFAC) model: two fluorescence components in initial degradation including mono substituted benzene and mono substituted naphthalene, three components as multi substituted benzene in rapid degradation, and no components could be resolved in the final degradation. The results from the study demonstrate the utility fluorescence characterization of dye degradation mechanisms and enhance the understanding of the degradation mechanisms.

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Section: Introductionmentioning

confidence: 99%

The Application of Fluorescence Spectroscopy for the Investigation of Dye Degradation by Chemical Oxidation

et al. 2020

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“…Yet its microbiological decomposition in fresh water can be lower than 1 mg/L [1] . In order to remove 2, 4-D, the oxidation of ozone, the photo-Fenton process and the various photochemical oxidation technology like O 3 /UV, H 2 O 2 /UV, O 3 /H 2 O 2 /UV,TiO 2 /UV,TiO 2 /UV/O 3 , Fe(Ⅱ)/UV/O 3 were all investigated [2][3][4][5][6][7][8][9] . Applications of gamma radiation had emerged in the removal of 2, 4-D [10] .…”

Section: Introductionmentioning

confidence: 99%

Degradation of 2, 4-D acid using Mn2+ as catalyst under UV irradiation

Liu

Fang

Wang

et al. 2009

Wuhan Univ. J. Nat. Sci.

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In this paper, the oxidative degradation of 2, 4-dichlorophenoxyacetic acid (2, 4-D) using Mn 2+ /H 2 O 2 reagent under UV irradiation was studied. The results show that 2, 4-D was degraded more completely in Mn 2+ /H 2 O 2 solution than traditional Fenton solutions. The effects of the concentration of Mn 2+ , H 2 O 2 and pH were also investigated. And under the optimal condition of 2 Mn c + 1.48×10 −4 mol/L, 2 2 H O c 8.99×10 −5 mol/L and pH 3.38, the formation of • OH was the most, both the decomposition rate of H 2 O 2 and the degradation rate of 2, 4-D were the fastest. In addition, the photoreaction process was monitored using spin-trapping electron paramagnetic resonance (EPR), and the results indicated that the oxidative process was predominated mainly by the hydroxyl radical (• OH) gennerated in the system.

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“…Since lower ratios of Fenton reagents (iron ion/hydrogen peroxide) have been reported to be important for degradation, 26,27) concentration ratios of 1/1-1/3 for Fe 3+ (4-16 mM)/H 2 O 2 (1-12%) were examined. However, the results did not reveal a clear relationship of the Fenton ratio, but rather indicated the reagent concentration dependence.…”

Section: Degradation Of Pcbs By the Fe 3+ -H 2 O 2 Systemmentioning

confidence: 99%

Chemical Degradation of Polychlorinated Biphenyls by the UV-Fe2+/Fe3+-H2O2 System and its Application for Polychlorinated Biphenyl-polluted Electric Insulating Oil

Azuma

Mino

2011

JOURNAL OF HEALTH SCIENCE

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The system design of UV-assisted catalytic oxidation process––degradation of 2,4-D

Cited by 12 publications

References 24 publications

The Application of Fluorescence Spectroscopy for the Investigation of Dye Degradation by Chemical Oxidation

The Application of Fluorescence Spectroscopy for the Investigation of Dye Degradation by Chemical Oxidation

Degradation of 2, 4-D acid using Mn2+ as catalyst under UV irradiation

Chemical Degradation of Polychlorinated Biphenyls by the UV-Fe2+/Fe3+-H2O2 System and its Application for Polychlorinated Biphenyl-polluted Electric Insulating Oil

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