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

2023

Preprint

In the present work an antibiotic drug degradation efficacy of a non-thermal pencil plasma jet in artificial wastewater. Air is used as a plasma-forming gas. The air plasma is produced in a cylindrical co-axial assembly of electrodes powered by a 50 Hz High-voltage power supply. The electrical characterization of plasma is performed and the generated plasma species/radicals are identified using optical emission spectroscopy. The degradation of antibiotics in solution after plasma treatment is analyzed using high performance liquid chromatography with photodiode array detector (HPLC-PDA). In addition, total organic carbon (TOC), and chemical oxygen demand (COD) is also determined. The HPLC-PDA results reveal that plasma degradation of antibiotics solution followed first-order degradation kinetics with a rate constant of 0.158 min-1 (ampicillin) and 0.366 min-1 (Cloxacillin). Furthermore, the reduction in TOC and COD supported the degradation of antibiotics using plasma jet. It has been observed the plasma 9-minute gives 76.10% and 99.99% degradation in ampicillin and cloxacillin solution respectively. The change in physicochemical properties and various reactive species formed due to which degradation of antibiotics solution take place are measured. Finally, the toxicity of plasma degraded antibiotic solutions are studied on freshwater chlorella algae species. The results reveal that plasma degraded antibiotics solutions are non-toxic toward freshwater algae. The non-thermal plasma jet could be a potential eco-friendly alternative for the degradation of various antibiotic drugs present in wastewater.

Section: Determination Of Reactive Species and Physicochemical Proper...supporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

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

2023

Preprint

“…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.…”

Section: Plasma Characterizationmentioning

confidence: 99%

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

2023

Preprint

The rising global cancer rate is driving up the consumption of anticancer drugs. This causing a noticeable increase in the levels of these drugs in wastewater. The drugs are not metabolized effectively by the human body, leading to their presence in human waste, as well as in the effluent from hospitals and drug manufacturing industries. Methotrexate is a commonly used drug for treating various types of cancer. Its complex organic structure makes it difficult to degrade using conventional methods. The present work proposed a non-thermal pencil plasma jet treatment for methotrexate degradation. The air plasma produced in this jet setup is electrical characterized and plasma species/radicals are identified using emission spectroscopy. The degradation of drug is monitored by studying the change in solution physiochemical properties, HPLC-UV analysis, and removal of total organic carbon, etc. Results show that a 9-minute plasma treatment completely degraded the drug solution that followed first order degradation kinetics with rate constant 0.38 min-1 and 84.54% mineralization was observed. Additionally, an increase in electrical conductivity and dissolved solids compared to virgin water-plasma interaction indicated the formation of new, smaller compounds (2,4-Diaminopteridine-6-carboxylic acid, N-(4-Aminobenzoyl)-L-glutamic acid, etc.) after drug degradation. The plasma-treated methotrexate solution also showed lower toxicity towards freshwater chlorella algae compared to the untreated solution. Finally, it can be said that non-thermal plasma jets are economically and environmentally friendly devices that have the potential to be used for the treatment of complex and resistive anticancer drugpolluted wastewaters.

“…To identify the species formed during plasma-dye solution interaction, the air plasma was treated with ultrapure milli-Q water. The change in physicochemical properties (pH, oxidation-reduction potential (ORP), total dissolved solids (TDS), and electrical conductivity (EC)) and formation of reactive species (nitrate ions (NO 3 ˉ), nitrite ions (NO 2 ˉ), hydrogen peroxide (H 2 O 2 ), and dissolved ozone (O 3 )) in water were measured periodically by following the procedure mentioned in our earlier reported work (35,41,42).…”

Section: Zeroth Order Modelmentioning

confidence: 99%

“…The above degradation of dyes solution with plasma solution occurs due to the formation of various reactive species in dye solution (35,41,42,46). These species were responsible for the degradation and mineralization of the above-mentioned dyes.…”

Section: Physicochemical Properties and Reactive Oxygen-nitrogen Spec...mentioning

confidence: 99%

Dyes degradation using atmospheric pressure dielectric barrier discharge pencil plasma jet

Pandey²,

Patel³

et al. 2023

Preprint

The dye degradation efficacy of the cold plasma pencil jet is presented in the present investigation. Air plasma is produced in the cylindrical coaxial dielectric barrier discharge configuration. Electrical characterization of plasma is performed and the plasma species are identified using optical emission spectroscopy. For the dye degradation study using air plasma, six different types of dyes (erythrosine, metanil yellow, sudan I, crystal violet, rhodamine B, and Indigo) are chosen. The degradation of dyes is analyzed using UV visible spectroscopy, total organic carbon, and chemical oxygen demand. The results showed complete degradation of all the dyes in UV visible analysis with minimum time for indigo (3 minutes) and maximum time for erythrosine (45 minutes). Moreover, erythrosine (k = 1.08 mg L-1 min-1) and sudan I (k= 3.46 mg L-1 min-1) follows zero-order degradation kinetic and metanil yellow (k = 0.094 min-1), crystal violet (k = 0.25 min-1), rhodamine B (k = 0.17 min-1), Indigo (k = 0.81 min-1) follows first-order degradation kinetics. Also, substantial enhancement in mineralization and reduction in chemical oxygen demand of all the dyes occurs after plasma treatment. The toxicity of plasma degraded dye solution toward freshwater algae species (Chlorella Sorokiniana and Chlorella Pyrenoidosa) are significantly low compared to virgin dyes solutions. The study reveals that pencil plasma jet substantially degrade dyes as well as converts the dyes solutions non-toxic.