Title of article :
A novel liquid plasma AOP device integrating microwaves and ultrasounds and its evaluation in defluorinating perfluorooctanoic acid in aqueous media
Author/Authors :
Horikoshi، نويسنده , , Satoshi and Sato، نويسنده , , Susumu and Abe، نويسنده , , Masahiko and Serpone، نويسنده , , Nick، نويسنده ,
Issue Information :
فصلنامه با شماره پیاپی سال 2011
Pages :
5
From page :
938
To page :
942
Abstract :
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.
Keywords :
Ultrasonic Cavitation , Microwave discharged liquid plasma , Perfluorinated acid , Wastewater treatment , Microwaves
Journal title :
Ultrasonics Sonochemistry
Serial Year :
2011
Journal title :
Ultrasonics Sonochemistry
Record number :
2189997
Link To Document :
بازگشت