TY - JOUR
T1 - A kinetic study of 3-chlorophenol enhanced hydroxyl radical generation during ozonation
AU - Utsumi, Hideo
AU - Han, Youn Hee
AU - Ichikawa, Kazuhiro
N1 - Funding Information:
This work is supported in part by Grants-in-Aid of Scientific Research, for Research in Priority Areas, for Cooperative Research, for General Science Research, and for Developmental Scientific Research from the Ministry of Education, Science, Sports and Culture, Fundamental Research Fund for the Environmental Future from Environmental Agency, Government of Japan, and by grant from the Takeda Science Foundation.
PY - 2003/12
Y1 - 2003/12
N2 - Hydroxyl (OH) radical is proposed as an important factor in the ozonation of water. In the present study, the enhancing effect of 3-chlorophenol on OH radical generation was mathematically evaluated using electron spin resonance (ESR)/spin-trapping technique. OH radical was trapped with a 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) as a stable adduct, DMPO-OH. The initial velocity of DMPO-OH generation in ozonated water containing 3-chlorophenol was quantitatively measured using a combined system of ESR spectroscopy with stopped-flow apparatus which was controlled by home-made software. The initial velocity of DMPO-OH generation increased as a function of the concentration of ozone and the more effectively of 3-chlorophenol concentration. The relation among ozone concentration, amount of 3-chlorophenol and the initial velocity (ν0) of DMPO-OH generation was mathematically analyzed and the following equation was obtained, ν 0 (10-6M/s)={9.7×[3-chlorophenol (10 -9M)]+0.0005}exp(57×[ozone (10-9M)]). The equation fitted very well with the experimental results, and the correlation coefficient was larger than 0.99. The equation for the enhancing effect by 3-chlorophenol should provide useful information to optimize the condition in ozone treatment process of water containing phenolic pollutants.
AB - Hydroxyl (OH) radical is proposed as an important factor in the ozonation of water. In the present study, the enhancing effect of 3-chlorophenol on OH radical generation was mathematically evaluated using electron spin resonance (ESR)/spin-trapping technique. OH radical was trapped with a 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) as a stable adduct, DMPO-OH. The initial velocity of DMPO-OH generation in ozonated water containing 3-chlorophenol was quantitatively measured using a combined system of ESR spectroscopy with stopped-flow apparatus which was controlled by home-made software. The initial velocity of DMPO-OH generation increased as a function of the concentration of ozone and the more effectively of 3-chlorophenol concentration. The relation among ozone concentration, amount of 3-chlorophenol and the initial velocity (ν0) of DMPO-OH generation was mathematically analyzed and the following equation was obtained, ν 0 (10-6M/s)={9.7×[3-chlorophenol (10 -9M)]+0.0005}exp(57×[ozone (10-9M)]). The equation fitted very well with the experimental results, and the correlation coefficient was larger than 0.99. The equation for the enhancing effect by 3-chlorophenol should provide useful information to optimize the condition in ozone treatment process of water containing phenolic pollutants.
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U2 - 10.1016/j.watres.2003.07.006
DO - 10.1016/j.watres.2003.07.006
M3 - Article
C2 - 14604638
AN - SCOPUS:0242266493
SN - 0043-1354
VL - 37
SP - 4924
EP - 4928
JO - Water Research
JF - Water Research
IS - 20
ER -