TY - JOUR
T1 - Ozonation characteristics of bisphenol a in water
AU - Lee, J.
AU - Park, H.
AU - Yoon, J.
N1 - Funding Information:
Financial aid from the Brain Korea 21 Program (the Ministry of Education) is gratefully acknowledged. The authors sincerely thank Dr. Lee Dong Soo for his discussion in revising this manuscript.
PY - 2003/2/1
Y1 - 2003/2/1
N2 - Ozonation characteristics of bisphenol A were investigated as a function of gaseous ozone dose, initial concentration of bisphenol A, pH, radical scavenger (tert‐butanol), and radical initiator (hydrogen peroxide). The ozonation led to a complete removal of bisphenol A in water within a certain period of time. The overall rate of the ozonation linearly increased with the ozone dose. The stoichiometry in the ozonation of bisphenol A was found to be 1.5 ‐ 1.8 mole of ozone per mole of bisphenol A. The direct reaction rate constants were 1.3 × 104 M‐1s‐1 for bisphenol A (at pH = 2) and 1.6 × 109M‐1s‐1 for dissociated bisphenol A (at pH = 12). Bisphenol A degraded via the direct reaction with molecular ozone in the pH range from 2 to 12. Degradation by OH radical was minor even at pH = 12. The overall degradation rate in heterogeneous conditions was independent of pH as it was limited by ozone mass transfer rate. Use of hydrogen peroxide did not alter the main degradation route and the molecular ozone remained a principal oxidant as a substantial portion of the OH radical is scavenged by hydrogen peroxide. Effective ozone mass transfer may appear essential to enhance the ozonation kinetics of bisphenol A.
AB - Ozonation characteristics of bisphenol A were investigated as a function of gaseous ozone dose, initial concentration of bisphenol A, pH, radical scavenger (tert‐butanol), and radical initiator (hydrogen peroxide). The ozonation led to a complete removal of bisphenol A in water within a certain period of time. The overall rate of the ozonation linearly increased with the ozone dose. The stoichiometry in the ozonation of bisphenol A was found to be 1.5 ‐ 1.8 mole of ozone per mole of bisphenol A. The direct reaction rate constants were 1.3 × 104 M‐1s‐1 for bisphenol A (at pH = 2) and 1.6 × 109M‐1s‐1 for dissociated bisphenol A (at pH = 12). Bisphenol A degraded via the direct reaction with molecular ozone in the pH range from 2 to 12. Degradation by OH radical was minor even at pH = 12. The overall degradation rate in heterogeneous conditions was independent of pH as it was limited by ozone mass transfer rate. Use of hydrogen peroxide did not alter the main degradation route and the molecular ozone remained a principal oxidant as a substantial portion of the OH radical is scavenged by hydrogen peroxide. Effective ozone mass transfer may appear essential to enhance the ozonation kinetics of bisphenol A.
KW - Bisphenol a
KW - Competitive kinetics
KW - Endocrine disrupting chemicals
KW - Oh radical
KW - Ozone
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U2 - 10.1080/09593330309385555
DO - 10.1080/09593330309385555
M3 - Article
C2 - 12666793
AN - SCOPUS:0037240239
SN - 0959-3330
VL - 24
SP - 241
EP - 248
JO - Environmental Technology (United Kingdom)
JF - Environmental Technology (United Kingdom)
IS - 2
ER -