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

被引：38

作者：

Horikoshi, Satoshi ^{[1
,2
]}

Sato, Susumu ^{[3
]}

Abe, Masahiko ^{[2
,4
]}

Serpone, Nick ^{[5
]}

机构：

[1] Sophia Univ, Dept Mat & Life Sci, Fac Sci & Technol, Chiyoda Ku, Tokyo 1028554, Japan

[2] Tokyo Univ Sci, Res Inst Sci & Technol, Chiba 2788510, Japan

[3] Toyo Univ, Sensor Photon Res Ctr, Kawagoe, Saitama 3508585, Japan

[4] Tokyo Univ Sci, Dept Pure & Appl Chem, Fac Sci & Technol, Chiba 2788510, Japan

[5] Univ Pavia, Dipartimento Chim, Grp Fotochim, I-27100 Pavia, Italy

来源：

ULTRASONICS SONOCHEMISTRY | 2011年 / 18卷 / 05期

基金：

日本学术振兴会;

关键词：

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

D O I：

10.1016/j.ultsonch.2011.01.003

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

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.

引用

页码：938 / 942

页数：5

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