Kinetics of the sulfate radical-mediated photo-oxidation of humic substances

2007 ◽  
Vol 40 (1) ◽  
pp. 19-24 ◽  
Author(s):  
Pedro M. David Gara ◽  
Gabriela N. Bosio ◽  
Mónica C. Gonzalez ◽  
Daniel O. Mártire
Keyword(s):  
Humic Substances ◽  
Sulfate Radical ◽  
Photo Oxidation ◽  
Kinetics Of

Kinetics of photo-oxidation of polydienes

1978 ◽  
Vol 20 (2) ◽  
pp. 526-532 ◽  
Author(s):  
V.B. Ivanov ◽  
M.N. Kuznetsova ◽  
L.G. Angert ◽  
V.Ya. Shlyapintokh
Keyword(s):  
Photo Oxidation ◽  
Kinetics Of

scholarly journals Characteristics and Kinetics of Rosin Pentaerythritol Ester via Oxidation Process under Ultraviolet Irradiation

Molecules ◽  
2018 ◽  
Vol 23 (11) ◽  
pp. 2816 ◽  
Author(s):  
Yuanlin Li ◽  
Xiongmin Liu ◽  
Qiang Zhang ◽  
Bo Wang ◽  
Chang Yu ◽  
...  
Keyword(s):  
Light Intensity ◽  
Oxidation Kinetics ◽  
Pseudo First Order Reaction ◽  
Initial Oxidation ◽  
Photo Oxidation ◽  
Average Value ◽  
Pentaerythritol Ester ◽  
Fundamental Information ◽  
The Stability ◽  
Kinetics Of

A self-designed reaction device was used as a promising equipment to investigate the oxidation characteristics and kinetics of rosin pentaerythritol ester (RPE) under UV irradiation. Photo-oxidation kinetics and the initial quantum yield (Φ) of RPE were calculated. The initial oxidation product of the photo-oxidation reaction—peroxide was analyzed by iodimetry. The peroxide concentration is related to the light intensity (I) and the temperature (T), and the increasing T and I would destabilize the RPE by accelerating peroxide forming. Photo-oxidation of RPE follows the pseudo first-order reaction kinetics. The relationship between activation energy and logarithm of light intensity (ln I) is linear, and it is expressed as Ea = −4.937ln I + 45.565. Φ was calculated by the photo-oxidation kinetics, and the average value of Φ was 7.19% in the light intensity range of 200–800 μW cm−2. This research can provide fundamental information for application of RPE, and help obtain a better understanding of the stability of rosin esters.

Enhancement of carboxylic acid degradation with sulfate radical generated by persulfate activation

2010 ◽  
Vol 61 (5) ◽  
pp. 1221-1226 ◽  
Author(s):  
J. Criquet ◽  
P. Nebout ◽  
N. Karpel Vel Leitner
Keyword(s):  
Aqueous Solution ◽  
Citric Acid ◽  
Carboxylic Acids ◽  
Sulfate Radical ◽  
Acid Degradation ◽  
Competitive Reactions ◽  
Radical Production ◽  
Persulfate Activation ◽  
Kinetics Of

The aim of this work was to investigate the generation of sulfate radical for the removal of two carboxylic acids in aqueous solution: acetic and citric acids. From photochemical and radiolytic processes, kinetics of the degradation of these two carboxylic acids was studied as a function of the pH of the solution. It was shown that the maximum of acetic acid degradation occurred at pH 5. Above this pH, competitive reactions with the carbon mineralized inhibit the reaction of with the solute. In the case of citric acid, pH has only a little effect on the kinetic of citric acid degradation. The determination of mineralization yields shows several differences depending on carboxylic acids and pH. The degradation of both carboxylic acids was also studied in the radiolysis process whether with or without persulfate addition. A comparison of the processes of sulfate radical production is presented.

Kinetics of 25-hydroperoxycholesterol formation during photo-oxidation of crystalline cholesterol

2013 ◽  
Vol 94 (8) ◽  
pp. 1543-1551 ◽  
Author(s):  
Ilce Gabriela Medina-Meza ◽  
Maria Teresa Rodriguez-Estrada ◽  
Giovanni Lercker ◽  
Carlo Barnaba ◽  
Hugo Sergio García
Keyword(s):  
Photo Oxidation ◽  
Kinetics Of

Kinetic investigations of Cl atom initiated photo-oxidation reactions of cyclic unsaturated hydrocarbons in the gas phase: an experimental and theoretical study

2017 ◽  
Vol 41 (15) ◽  
pp. 7491-7505 ◽  
Author(s):  
S. Vijayakumar ◽  
C. B. Ramya ◽  
Avinash Kumar ◽  
B. Rajakumar
Keyword(s):  
Gas Phase ◽  
Oxidation Kinetics ◽  
Theoretical Study ◽  
Oxidation Reactions ◽  
Unsaturated Hydrocarbons ◽  
Photo Oxidation ◽  
Kinetic Investigations ◽  
Kinetics Of ◽  
Cl Atom

Cl atom initiated photo oxidation kinetics of cyclohexene and cycloheptene.

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