A comparative study of dielectric barrier discharge plasma device and plasma jet to generate plasma activated water and post-discharge trapping of reactive species

Abstract

This work shows a comparative study of a change in properties of plasma-activated water (PAW) when prepared by using two different dielectric barrier discharge (DBD) configurations named a pencil plasma jet (PPJ) and a plasma device (PD). The air plasma produced from the DBD-PPJ and DBD-PD is characterized by voltage-current characteristics, and plasma species/radicals are identified using optical emission spectroscopy. Moreover, the present work emphasizes the trapping of reactive species (O3, NOx, etc.) carried by post-discharge residual gases during PAW production. The trapping of these gases' reactive species is carried out in water, which provides a useful by-product named plasma processed water (PPW). The results revealed a higher concentration of reactive oxygen species (dissolved O3 and H2O2) and a lower concentration of reactive nitrogen species (NO3− and NO2− ions) in PAW prepared by the DBD-PPJ configuration compared to the DBD-PD configuration. The trapping of reactive species (O3 and NOx) present in post-discharge residual gases is confirmed by determining the change in physicochemical properties and reactive oxygen–nitrogen species (RONS) concentration in virgin water used as a trapping medium. The high concentration of RONS in PPW showed a high concentration of reactive species in post-discharge residual gases and vice versa. Therefore, the reduction in reactive species downstream of post-discharge residual gases is shown by a substantial decrease in the concentration of RONS and physicochemical properties of PPW. Thus, PAW and PPW (by-product) prepared in this work could be used for multiple applications such as microbial inactivation, food preservation, and agriculture.

Methotrexate degradation in artificial wastewater using non-thermal pencil plasma jet

“…These interact with the solution, changing its chemical properties. The formation of various species and radicals in the solution due to plasma-water interaction has been shown in previous studies (41,43,44,48). The presence of these species is significant in the degradation of pollutants present in wastewater.…”

“…These species collectively have the potential to degrade the complex structure of these chemotherapy drugs. As the plasma-liquid interaction time increases, more and more reactive species are generated, as shown in supplementary material Table S2 (41)(42)(43)(44)48).…”

“…The air plasma optical emission spectra is shown in Figure 1 (see supplementary Figure S3 for details of emission lines) (44,(47)(48)(49)(50). These generated species/radicals are the major contributors that change the physicochemical properties of the solution as well as responsible for degradation of organic impurities present in wastewater.…”

“…The change in the physicochemical properties of methotrexate solution with increasing plasma treatment time is shown in Figure 2. These changes occur due to the dissolution of various short-lived and long-lived species in the methotrexate solution (41,43,44,48). As the plasma treatment time with methotrexate solution increases, a continuous decrease in pH and an increase in ORP, TDS, and EC are observed.…”

Penicillin Antibiotic (Ampicillin and Cloxacillin) Degradation Using Non-Thermal Pencil Plasma Jet

“…The various reactive species such as hydroxyl radical (HO•), dissolved ozone (O 3 ), peroxynitrite (ONOO‾), nitric oxide (NO), etc. are responsible for degraded antibiotics present in wastewater (13)(14)(15)(16)(17)(18)(19)(20)(21). Rong et al (13) reported the role of HO• in degradation of sulfadiazine antibiotics in aqueous solution.…”