臭氧作用下酮洛芬的降解行为及机理研究

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Abstract Oxidization of the simulated ketoprofen (KET) wastewater was investigated by ozone (O₃). The effect of the initial solution pH, ozone flow (Q_O₃), temperature (T), and initial KET concentration (C₀) on KET degradation were investigated. To assess the contribution of O₃ and hydroxyl radicals (·OH) to the degradation of KET, experiments have been conducted under the conditions comprising initial KET concentration of 20μmol/L, ozone flow at 0.4L/min, pH at 4, 7, or 10under room temperature. In the competition experiments, ibuprofen and benzoic acid were used as the probe to measure the second-order rate constants of KET degradation with respect to O₃ and ·OH, respectively. Results indicated that KET degradation followed the pseudo first-order kinetics. Increasing pH, Q_O₃ and T accelerated KET degradation, while KET degradation rate decreased with the increase of C₀. The apparent kinetics equation (k=154439exp (-32831/RT)Q_O₃^0.679C₀^-0.2[OH^-]^0.07) was obtained by fitting experimental data. Both O₃ and ·OH are contributed to the degradation of KET. Results also showed that the contribution of O₃ to KET degradation were 18.4%,11.0%, and 6.2%, while to ·OH were 81.6%, 89.0% and 93.8% at pH 4, 7, and 10, respectively. The second-order rate constants of KET were 1.09, and 8.82×10⁹L/(mol·s) with respect to O₃ and ·OH, respectively.

Key words： ozonation ketoprofen apparent kinetics equation hydroxyl radical second-order rate constant

Received: 22 March 2016

PACS:

X131.2

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	Articles by authors
	LIN Xiao-xuan
	LIU Guo-guang
	LI Ruo-bai
	KONG Qing-qing
	CHEN Zhi-ming
	LI Fu-hua
	CHEN Ping
	LU Yi-da

Cite this article:

LIN Xiao-xuan,LIU Guo-guang,LI Ruo-bai等. Study on ketoprofen degradation behavior and mechanism under ozonation[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(2): 598-605.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2017/V37/I2/598

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