Mechanism and kinetics of 2-chlorophenol decomposition using coupled ultrasound and electrocatalysis

作者：Wang JiaDe; Zhu RunYe; Chen Xia; Chen JianMeng^*

来源：Science in China Series B-Chemistry, 2008, 51(6): 577-585.

DOI：10.1007/s11426-007-0137-2

• ultrasound
• electrocatalysis synergetic oxidation
• mechanism
• kinetics
• 2-chlorophenol

A coupled ultrasound/electrocatalysis (US/EC) process was used to enhance the decomposition efficiency of organics. The synergetic kinetics and the mechanism of 2-chlorophenol (2-CP) decomposition with coupled US/EC were studied. It was found that in a US/EC process 2-CP is attacked by active radicals (such as hydroxyl radicals) to form 2-chloro-p-benzoquinone, and the latter is oxidized to simple organic acids when the ring is opened. The enhancement factor expressed by the apparent rate constant of 2-CP decomposition with coupled US/EC is 1.324 at a current density of 20 mA center dot cm(-2), an ultrasonic frequency of 20 kHz, an ultrasonic intensity of 0.27 W center dot cm(-2), and a 2-CP initial concentration of 200 mg . L(-1), which means that a synergetic effect exists. A model derived from Langmuir adsorption theory of solid surface and reaction kinetics equations can describe exactly the decomposition of 2-CP with coupled US/EC. The numerical values are in good agreement with the experimental data. The model parameters are associated with reaction conditions.

• 出版日期2008-6
• 单位浙江工业大学