Additions and Corrections - Kinetics of Hydroxyl Radical Spin Trapping in Photoactivated Homogenous (H2O2) and Heterogeneous (TiO2, O2) Aqueous Systems

1995 ◽  
Vol 99 (3) ◽  
pp. 1064-1064
Author(s):  
V. Brezova ◽  
A. Stalko ◽  
S. Biskupic ◽  
A. Blazkova ◽  
B. Havlinova
Keyword(s):  
Hydroxyl Radical ◽  
Spin Trapping ◽  
Aqueous Systems ◽  
Kinetics Of

Kinetics of Hydroxyl Radical Spin Trapping in Photoactivated Homogeneous (H2O2) and Heterogeneous (TiO2, O2) Aqueous Systems

1994 ◽  
Vol 98 (36) ◽  
pp. 8977-8984 ◽  
Author(s):  
V. Brezova ◽  
A. Stasko ◽  
S. Biskupic ◽  
A. Blazkova ◽  
B. Havlinova
Keyword(s):  
Hydroxyl Radical ◽  
Spin Trapping ◽  
Aqueous Systems ◽  
Kinetics Of

Enhancement of hydroxyl radical generation by phenols and their reaction intermediates during ozonation

1998 ◽  
Vol 38 (6) ◽  
pp. 147-154 ◽  
Author(s):  
Hideo Utsumi ◽  
Sang-Kuk Han ◽  
Kazuhiro Ichikawa
Keyword(s):  
Hydroxyl Radical ◽  
Hydroxyl Radicals ◽  
Spin Trapping ◽  
Active Species ◽  
Generation Rate ◽  
Peak Height Ratio ◽  
Dependent Manner ◽  
Concentration Dependent Manner ◽  
Phenol Derivatives ◽  
Semiquinone Radicals

Generation of hydroxyl radicals, one of the major active species in ozonation of water was directly observed with a spin-trapping/electron spin resonance (ESR) technique using 5,5-dimethyl-1-pyrrolineN-oxide (DMPO) as a spin-trapping reagent. Hydroxyl radical were trapped with DMPO as a stable radical, DMPO-OH. Eighty μM of ozone produced 1.08 X 10-6M of DMPO-OH, indicating that 1.4% of •OH is trapped with DMPO. Generation rate of DMPO-OH was determined by ESR/stopped-flow measurement. Phenol derivatives increased the amount and generation rate of DMPO-OH, indicating that phenol derivatives enhance •OH generation during ozonation of water. Ozonation of 2,3-, 2,5-, 2,6-dichlorophenol gave an ESR spectra of triplet lines whose peak height ratio were 1:2:1. ESR parameters of the triplet lines agreed with those of the corresponding dichloro-psemiquinone radical. Ozonation of 2,4,5- and 2,4,6-trichlorophenol gave the same spectra as those of 2,5- and 2,6-dichlorophenol, respectively, indicating that a chlorine group in p-position is substituted with a hydroxy group during ozonation. Amounts of the radical increased in an ozone-concentration dependent manner and were inhibited by addition of hydroxyl radical scavengers. These results suggest that p-semiquinone radicals are generated from the chlorophenols by hydroxyl radicals during ozonation. The p-semiquinone radicals were at least partly responsible for enhancements of DMPO-OH generation.

Kinetics of reactions in microheterogeneous aqueous systems

1984 ◽  
Vol 80 (3) ◽  
pp. 739 ◽  
Author(s):  
Michael J. Blandamer ◽  
John Burgess ◽  
Barbara Clark ◽  
Philip P. Duce ◽  
John M. W. Scott
Keyword(s):  
Aqueous Systems ◽  
Kinetics Of

Soil-pH and cement influence the weathering kinetics of chrysotile asbestos in soils and its hydroxyl radical yield

2021 ◽  
pp. 128068
Author(s):  
Martin Walter ◽  
Gerald Geroldinger ◽  
Lars Gille ◽  
Stephan M. Kraemer ◽  
Walter D.C. Schenkeveld
Keyword(s):  
Hydroxyl Radical ◽  
Soil Ph ◽  
Chrysotile Asbestos ◽  
Kinetics Of ◽  
Radical Yield

Chlorination and bromination kinetics of emerging contaminants in aqueous systems

2013 ◽  
Vol 219 ◽  
pp. 43-50 ◽  
Author(s):  
Juan L. Acero ◽  
F. Javier Benitez ◽  
Francisco J. Real ◽  
Gloria Roldan ◽  
Elena Rodriguez
Keyword(s):  
Emerging Contaminants ◽  
Aqueous Systems ◽  
Kinetics Of
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