Influence of electrical parameters on H₂O₂generation in DBD non-thermal reactor with water mist

Abstract

A dielectric barrier discharge (DBD) reactor is introduced to generate H 2 O 2 by non-thermal plasma with a mixture of oxygen and water mist produced by an ultrasonic atomizer. The results of our experiment show that the energy yield and concentration of the generated H 2 O 2 in the pulsed discharge are much higher than that in AC discharge, due to its high energy efficiency and low heating effect. Micron-sized liquid droplets produced by an ultrasonic atomizer in water mist have large specific surface area, which greatly reduces mass transfer resistance between hydroxyl radicals and water liquids, leading to higher energy yield and H 2 O 2 concentration than in our previous research. The influence of applied voltage, discharge frequency, and environmental temperature on the generated H 2 O 2 is discussed in detail from the viewpoint of the DBD mechanism. The H 2 O 2 concentration of 30 mg l −1 , with the energy yield of 2 g kW −1 h −1 is obtained by pulsed discharge in our research.

Control of multidrug-resistant planktonicAcinetobacter baumannii: biocidal efficacy study by atmospheric-pressure air plasma

“…Although cold atmospheric-pressure plasmas have shown an efficient killing effect against bacteria, it seems to induce little or no damage to mammalian cells due to the difference in structure and morphology between prokaryotes and mammalian cells, which means that it is possible to use plasma in various medical applications [17]. In the generated plasmas, reactive charged and neutral active species, ultraviolet light, electrons, and other reactive species (RS) including OH, O, O 3 , nitric oxide, superoxide, hydrogen peroxide, and singlet oxygen are present [18][19][20]. As nonthermal plasmas can generate these active species to sterilize surfaces, the technique offers antimicrobial capability [21].…”

Degradation of phenol using a combination of granular activated carbon adsorption and bipolar pulse dielectric barrier discharge plasma regeneration

“…Non-thermal plasma (NTP), as a new advanced oxidation technology (AOT) has drawn extensive attention. NTP can generate multiple types of active species, including hydrogen peroxide (H 2 O 2 ), hydroxyl radicals (•OH), ozone (O 3 ), and other chemically reactive radicals [11][12][13], which play an important role in the degradation of organics in water, soil, and the atmosphere [14][15][16]. Furthermore, dielectric barrier discharge (DBD) plasma as one of the most applied NTP technologies, can be stably generated by simple electrode configurations [17].…”

“…TOC removal of the phenol under different air flow rates.Due to the short life of •OH radicals (<10 −3 s), it is hard to quantitatively detect the amount of •OH during the discharge process. Nevertheless, •OH is itself a precursor to H 2 O 2 generation, thus the existence of the quantity •OH and its oxidation performance could be reflected indirectly by the amount of H 2 O 2[11,30,31]. The following synthesis reactions led to the production of H 2 O 2 .…”

Strengthening decomposition of oxytetracycline in DBD plasma coupling with Fe-Mn oxide-loaded granular activated carbon

“…These effects can decompose organics rapidly and nonselectively [8,9]. Among the different types of NTPs, dielectric barrier discharge (DBD) plasma has been extensively studied since it can be easily and stably generated with a vast array of active substances [10][11][12]. DBD plasma has been applied to treat environmental contaminants in water, air, and soil [13][14][15].…”