Estimation of ⋅OH radical reaction rate constants for phenol and chlorinated phenols using UV/H2O2 photo-oxidation

De, Arijit; Chaudhuri, Basab; Bhattacharjee, Sekhar; Dutta, Binay K.

doi:10.1016/s0304-3894(98)00225-8

Cited by 102 publications

(44 citation statements)

References 22 publications

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“…However, the time required for degradation in both the cases is still long (300 min). This is in agreement with the observations of De et al (1999), that the presence of chlorine atoms creates an electron rich atmosphere in the aromatic ring, making it more resistant to hydroxyl radical attack. In Fenton process, the same amount of 2,4,6 T is degraded with in 180 min.…”

Section: Mineralisation Of 246 Tsupporting

confidence: 93%

Degradative Oxidation of 2,4,6 Trichlorophenol Using Advanced Oxidation Processes – A Comparative Study

Saritha

Raj

Aparna

et al. 2008

Water Air Soil Pollut

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In the present study, a comparative assessment of 2,4,6-T (2,4,6-Trichlorophenol) degradation by different AOPs (Advanced Oxidation Processes -UV, UV/ H 2 O 2 , Fenton, UV/Fenton and UV/TiO 2 ) in the laboratory scale is performed. The effects of different reactant concentrations and pH are assessed. 2,4,6-T removal, Total Organic Carbon mineralization (TOC) and dechlorination are monitored. Of all the AOPs, UV/Fenton process is more effective in degrading 2,4,6-T. The optimum conditions obtained for the best degradation with UV/Fenton are: pH=3, Fe +2 concentration of about 5 ppm, and peroxide concentration of 100 ppm for an initial 100 ppm of 2,4,6 T concentration at room temperature. In these conditions, a pseudo first-order rate constant is evaluated. The degradation rate of 2,4,6 T followed the order:UV=Feton > UV=TiO 2 > UV=H 2 O 2 > Feton > UV

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Section: Mineralisation Of 246 Tsupporting

confidence: 93%

Degradative Oxidation of 2,4,6 Trichlorophenol Using Advanced Oxidation Processes – A Comparative Study

Saritha

Raj

Aparna

et al. 2008

Water Air Soil Pollut

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“…In the presence of an excess mole ratio of H 2 O 2 to phenol, the following additional reactions are likely to occur [33,34]: …”

Section: Kinetic Analysismentioning

confidence: 99%

“…Applying the steady-state approximation [5,8,33,34,39,40] to the transitory reactive intermediates, we can write the following:…”

Section: Kinetic Analysismentioning

confidence: 99%

Kinetics of microwave-enhanced oxidation of phenol by hydrogen peroxide

Zhao

Cheng

Hoffmann

2010

Front. Environ. Sci. Eng. China

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Aqueous solutions of phenol were oxidized by hydrogen peroxide assisted by microwave (MW) irradiation. A simple kinetic model for the overall degradation of phenol in the presence of excess H 2 O 2 is proposed in which the degradation rate of phenol is expressed as a linear function of the concentrations of phenol and H 2 O 2 . A detailed parametric study showed that the degradation rate of phenol increased with increasing [H 2 O 2 ] until saturation was observed. Phenol degradation followed apparent zero-order kinetics under MW radiation or H 2 O 2 oxidation. However, after 90 min of irradiation, the observed kinetics shifted to pseudo first order. The overall reaction rates were significantly enhanced in the combined MW/H 2 O 2 system, mainly because microwave could accelerate H 2 O 2 to generate hydroxyl radical ( $ OH) and other reactive oxygen intermediates. The observed synergetic effects of the MW/H 2 O 2 process resulted in an increased in the net reaction rate by a factor of 5.75. When hydrogen peroxide is present in a large stoichiometric excess, the time required to achieve complete mineralization is reduced significantly.

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“…Degradation of phenol by different AOPs, including UVbased processes, has been reported in the literature [8][9][10][11][12][13][14]. It is well known that phenol oxidation treatments lead to the generation of highly toxic intermediate products [1], and there is scarcity of toxicity and environmental impact studies.…”

Section: Introductionmentioning

confidence: 99%

Mathematical modelling of phenol photooxidation: Kinetics of the process toxicity

Primo

Rivero

Ortiz

et al. 2007

Chemical Engineering Journal

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Estimation of ⋅OH radical reaction rate constants for phenol and chlorinated phenols using UV/H2O2 photo-oxidation

Cited by 102 publications

References 22 publications

Degradative Oxidation of 2,4,6 Trichlorophenol Using Advanced Oxidation Processes – A Comparative Study

Degradative Oxidation of 2,4,6 Trichlorophenol Using Advanced Oxidation Processes – A Comparative Study

Kinetics of microwave-enhanced oxidation of phenol by hydrogen peroxide

Mathematical modelling of phenol photooxidation: Kinetics of the process toxicity

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