4.7 Article

A novel liquid plasma AOP device integrating microwaves and ultrasounds and its evaluation in defluorinating perfluorooctanoic acid in aqueous media

期刊

ULTRASONICS SONOCHEMISTRY
卷 18, 期 5, 页码 938-942

出版社

ELSEVIER
DOI: 10.1016/j.ultsonch.2011.01.003

关键词

Microwaves; Ultrasonic cavitation; Microwave discharged liquid plasma; Wastewater treatment; Perfluorinated acid

资金

  1. Japan Society for the Promotion of Science (JSPS) [B-21750210]
  2. Ministry of Education, Culture, Sports, Science and Technology, Japan [18070006]
  3. Grants-in-Aid for Scientific Research [23750247, 18070006] Funding Source: KAKEN

向作者/读者索取更多资源

A simplified and energy-saving integrated device consisting of a microwave applicator and an ultrasonic homogenizer has been fabricated to generate liquid plasma in a medium possessing high dielectric factors, for example water. The microwave waveguide and the ultrasonic transducer were interconnected through a tungsten/titanium alloy stick acting both as the microwave antenna and as the horn of the ultrasonic homogenizer. Both microwaves and ultrasonic waves are simultaneously transmitted to the aqueous media through the tungsten tip of the antenna. The microwave discharge liquid plasma was easily generated in solution during ultrasonic cavitation. The simple device was evaluated by carrying out the degradation of the perfluorooctanoic acid (PFOA), a system highly recalcitrant to degradation by conventional advanced oxidation processes (AOPs). PFOA is 59% degraded in an aqueous medium after only 90 s of irradiation by the plasma. Intermediates were identified by electrospray mass spectral techniques in the negative ion mode. (C) 2011 Elsevier B.V. All rights reserved.

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