Treatment of methyl orange by nitrogen non-thermal plasma in a corona reactor: The role of reactive nitrogen species

Self Cite

A reactor with two interchangeable plasma sources was developed and tested in water decontamination experiments using phenol as model organic pollutant. The two configurations were characterized and compared by determining the reactive species produced in the aqueous phase (concentration of ozone and of hydrogen peroxide as a function of input energy and rate of OH radical production) and the efficiency in phenol degradation. The streamer discharge performed significantly better than the dielectric barrier discharge: the rate of OH radicals production was ten times faster and the efficiency of phenol degradation, as measured by the G50 parameter, was more than twice as large. Moreover, the streamer discharge induced process was kinetically faster and achieved better mineralization yields in shorter times.

Section: Resultsmentioning

confidence: 99%

Characterization and comparative evaluation of two atmospheric plasma sources for water treatment

Bosi

Tampieri

Marotta

et al. 2017

Self Cite

“…Since the dc‐APGD is fully operated in the open‐to‐air atmosphere, the reactive nitrogen species (RNS), for example, peroxynitrite, NO x are concurrently produced in the examined plasma‐reaction system. These species may also play an important role in the decomposition of organic dyes . Moreover, relative strong UV radiation, emanating from the dc‐APGD, may also participate in decomposition of the studied organic dyes in the same way as the reactive species …”

Section: Resultsmentioning

confidence: 97%

“…According to the literature, CAPs generated in or in contact with liquids were found to be useful in decomposing different toxic organic components in wastewaters, including removal of dyes . Mohammadi and Ashkarran applied a corona discharge to decolorization of eight standard organic dyes, that is, phenol red, methyl orange, diamine green, pyrogallol red, bromocresol green, bromochlorophenol blue, naphtol green B, and crystal violet, in water solutions.…”

Section: Introductionmentioning

confidence: 99%

Decolorization of organic dyes solution by atmospheric pressure glow discharge system working in a liquid flow‐through mode

Jamróz

Dzimitrowicz

2017

A new atmospheric pressure glow discharge (APGD) plasma-reaction system generated between a flowing liquid electrode and an Ar microjet nozzle is applied to decompose various organic dyes. The APGD system is working in a flow-through mode in an open to air atmosphere. Degradation of the organic dyes and formation of reactive oxide and nitrogen species in the liquid and plasma-liquid interface zone are studied. Effectiveness of this system in decomposition of the organic dyes is also compared with that achieved for the classical advances oxidation processes (AOPs)

“…As the absorbance intensity of the MO solution at 465 nm is used to represent the MO concentration, the slope can represents the MO decomposition rate. It has been shown that the MO degradation caused by the plasma‐induced reactants starts at the linking bonds around the π‐rings, and then at the –N=N– bonds, which will cause two speeds of the MO decomposition during the plasma treatment. As shown in Figure , the first two slopes correspond to the decomposition rates of the linking bonds around the π‐rings and the –N=N– bond of MO molecule, respectively.…”

Section: Resultsmentioning

confidence: 99%

Influence of the pH value on the degradation of an azo dye of methyl orange by air discharge plasma

Chen

et al. 2019

Treatment of methyl orange (MO) synthetic wastewater by air discharge plasma was investigated, and the solution's pH value was found to be a key parameter of influencing the treatment efficiency. The results indicate that lower pH value can induce production of high reactive species, NO+ and peroxynitrous acid, which can contribute to the MO decomposition. When the appropriate amount of Fe2+ ions is present in the MO solution, the MO decomposition can be promoted by Fenton's reaction (Fe2+ reacts with H2O2 produced from the plasma–liquid interaction). Furthermore, the lower pH value is also beneficial for the Fenton's reaction by avoiding an appearance of Fe(OH)3 precipitate that can reduce the treatment efficiency.