Journal
ULTRASONICS SONOCHEMISTRY
Volume 22, Issue -, Pages 198-204Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultsonch.2014.07.014
Keywords
Hydroxyl radical ((OH)-O-center dot); Multiple-field ultrasound; Catalytic ozonation; Nitrobenzene; Degradation
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Funding
- National Natural Science Foundation of China [51108119]
- Fundamental Research Funds for the Central Universities [HIT. NSRIF, 2010012]
- Specialized Research Fund for the Doctoral Program of Higher Education [20112302120066]
- Program for New Century Excellent Talents in University, Ministry of Education of China [NCET-13-0180]
- State Key Laboratory of Pollution Control and Resource Reuse Foundation [PCRRF13003]
- Postdoctoral Science-Research Developmental Foundation of Heilongjiang Province [LBH-Q12107]
- State Scholarship Foundation of the China Scholarship Council [201306125022]
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The synergetic effect between ozone and ultrasound can enhance the degradation of nitrobenzene and removal efficiency of TOC in aqueous solution, and the degradation of nitrobenzene follows the mechanism of hydroxyl radical ((OH)-O-center dot) oxidation. Under the same total ultrasonic power input condition, the degradation rate of nitrobenzene (k(NB)), the volumetric mass transfer coefficient of ozone (k(L)a), and the initiation rate of (OH)-O-center dot (k center dot OH) increases with introduction of additional ultrasonic field (1-4) in the process of ozone/ultrasound. The increasing amount of ultrasonic fields accelerates the decomposition of ozone, leading to the rapid appearance of the maximum equilibrium value and the decrease in the accumulation concentration of ozone in aqueous solution with the increasing reaction time. The increase in mass transfer of gaseous ozone dissolved into aqueous solution and the acceleration in the decomposition of ozone in aqueous solution synchronously contribute to the increase of k(L)a. The investigation of mechanism confirms that the increasing amount of ultrasonic fields yields the increase in cavitation activity that improves the mass transfer and decomposition of ozone, resulting in acceleration of (OH)-O-center dot initiation, which determines the degradation of nitrobenzene in aqueous solution. (C) 2014 Elsevier B.V. All rights reserved.
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