Isomer distribution ratios of phenols in aromatic hydroxylation with the hydroxyl radical generated from .alpha.-azohydroperoxide in anhydrous organic media. Comparison with Fenton's reagent

1981 ◽  
Vol 103 (11) ◽  
pp. 3045-3049 ◽  
Author(s):  
Takahiro Tezuka ◽  
Nozomu Narita ◽  
Wataru Ando ◽  
Shigeru Oae
Keyword(s):  
Hydroxyl Radical ◽  
Organic Media ◽  
Fenton’S Reagent ◽  
Fenton's Reagent ◽  
Isomer Distribution ◽  
Aromatic Hydroxylation ◽  
Media Comparison

Studies of oxidations by fenton's reagent using redox titration. V. Effect of complex formation on reaction mechanism

1973 ◽  
Vol 26 (5) ◽  
pp. 1021 ◽  
Author(s):  
DL Ingles
Keyword(s):  
Reaction Mechanism ◽  
Complex Formation ◽  
Hydroxyl Radical ◽  
Butyl Alcohol ◽  
Fenton’S Reagent ◽  
Redox Titration ◽  
Fenton's Reagent ◽  
Free Hydroxyl ◽  
Electron Transfers ◽  
H2o2 System

The effect of complex formation on the oxidation of substrate in the Fe2+-H2O2 system has been studied. t-Butyl alcohol which is normally oxidized to the dimer, 2,5-dimethylhexane-2,5-diol, by Fenton's reagent has been used as a probe for the presence of free hydroxyl radical. ��� It is shown that when suitable complexes are formed substrates are not oxidized by free hydroxyl radical. Instead, new mechanisms involving one- and two-electron transfers within a substrate-ferrous ion-peroxide complex are proposed.

Reactions of Hydroxyl Radicals with Chlorobenzenes: Comparison of TiO2 Photocatalyst Reactions to Fenton’s Reagent

1989 ◽  
Vol 24 (4) ◽  
pp. 537-552 ◽  
Author(s):  
G. Lepore ◽  
C.H. Langford
Keyword(s):  
Hydroxyl Radical ◽  
Hydroxyl Radicals ◽  
Aqueous Media ◽  
Surface Generation ◽  
Fenton’S Reagent ◽  
Adsorbed State ◽  
Fenton's Reagent ◽  
Photo Catalysis ◽  
Solution Generation ◽  
The Individual

Abstract A comparative study on reactions of solution and surface generated hydroxyl radicals with chlorobenzenes has been carried out, to determine the reaction path of reactive intermediates in photo-catalysis. Two separate approaches for generating hydroxyl radical oxidants in aqueous media were employed. Fenton’s reagent (solution generation) and TiO2 irradiation (surface generation) were exploited in the decomposition of dichlorobenzenes, 1,2,4-trichlorobenzene and a mixture (o-DCB, m-DCB, 1,2,4-TCB). Photocatalysis displayed a distinctive order for the individual chlorobenzenes with increasing ease of disappearance: p-DCB < 1,2,4-TCB < o-DCB < m-DCB. Reduced selectivity was observed for a mixture. Use of Fenton’s reagent resulted in the following pattern for both individual and the mixture of chlorobenzenes: 1,2,4-TCB < o-DCB ≈ p-DCB ≈ m-DCB. Added acetone, suppressed the disappearance of the parent chlorinated aromatics in both systems. However, in the reaction with Fenton’s reagent 1,2,4-TCB displayed considerable sensitivity in comparison to the DCB isomers. In contrast, the photocatalysis of three individual substrates evaluated in a mixture (1,2,4-TCB, m-DCB, o-DCB) did not manifest significant differences. Results indicate that reactions observed on the photocatalyst must occur in the adsorbed state, where the oxidant is an adsorbed hydroxyl radical or the surface trapped hole itself.

scholarly journals Treatment of Water Contaminated with DI-N-Butyl Phthalate by Foto-Fenton Process

2013 ◽  
Vol 5 (1) ◽  
pp. 23-28
Keyword(s):  
Hydrogen Peroxide ◽  
Hydroxyl Radical ◽  
Uv Irradiation ◽  
Fenton’S Reagent ◽  
H2o2 Concentration ◽  
Fenton Process ◽  
Ferrous Ions ◽  
Fenton's Reagent ◽  
Dominant Mechanism ◽  
Butyl Phthalate

This study was conducted to assess the removal efficiency of Di-n-butyl phthalate (DnBP) from aqueous medium using the photo-Fenton process. The Fenton's reagent that consists of a mixture of hydrogen peroxide (H2O) and ferrous ions (Fe2+) was used to generate the hydroxyl radical (OH0) that attacks the target contaminant and degrade it. An ultraviolet (UV) source was used to provide the radiation needed in the photo-Fenton method (i.e. UV/H2O2/Fe2+). The results demonstrated that photo-Fenton process was more effective and faster than Fenton's reagent in removing DnBP and that photolysis by UV irradiation was the dominant mechanism in degrading the compound. The results also showed that enhancing the removal via UV irradiation was achieved by increasing either the temperature or the H2O2 concentration.

Use of Fenton's Reagent for the Degradation of TCE in Aqueous Systems and Soil Slurries

2000 ◽  
Vol 9 (4) ◽  
pp. 331-345 ◽  
Author(s):  
Katherine R. Weeks ◽  
Clifford J. Bruell ◽  
Nihar R. Mohanty
Keyword(s):  
Fenton’S Reagent ◽  
Aqueous Systems ◽  
Fenton's Reagent

The action of fenton's reagent on carbohydrates

Tetrahedron ◽  
1963 ◽  
Vol 19 (11) ◽  
pp. 1705-1710 ◽  
Author(s):  
G.J. Moody
Keyword(s):  
Fenton’S Reagent ◽  
Fenton's Reagent

Additions and Corrections - Oxidation of Mandelic Acid by Fenton's Reagent

1982 ◽  
Vol 104 (13) ◽  
pp. 3783-3783
Author(s):  
Cheves Walling ◽  
Kalyani Amarnath ◽  
Curt Campbell
Keyword(s):  
Mandelic Acid ◽  
Fenton’S Reagent ◽  
Fenton's Reagent
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