Cavitation-induced pyrolysis of toxic chlorophenol by high-frequency ultrasonic irradiation.
p-Chlorophenol (4-CP) is a recalcitrant organic pollutant that is biologically toxic in industrial wastewater. A high-frequency ultrasonic device operated at 1.7 MHz was designed and used successfully to degrade 4-CP. Iodine liberation in the KI aqueous solution confirmed that effective cavitation occurred under the high-frequency ultrasonic irradiation. No products or intermediate products were detected following the sonochemical degradation by 1H-nuclear magnetic resonance spectrum and mass spectrum after ultrasonic irradiation. It was concluded that the dominant degradation mechanism was high-temperature pyrolysis to inorganic products in ultrasonic cavities rather than free-radical oxidation.
Hao
Hongwei
H
Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, People's Republic of China. hhw99@mails.tsinghua.edu.cn
Wu
Minsheng
M
Chen
Yifang
Y
Yin
Yingwu
Y
Lü
Zhaolin
Z
D002733:Chlorophenols / Q000737:chemistry*; D007220:Industrial Waste; D007455:Iodine / Q000032:analysis; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D014465:Ultrasonics; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*
D002733:Chlorophenols; D007220:Industrial Waste; C029107:4-chlorophenol; D007455:Iodine