Reaction of dichloromethane under non-oxidative conditions in a dielectric barrier discharge reactor and characterisation of the resultant polymer

Gaikwad, Vaibhav; Kennedy, Eric M.; Mackie, John C.; Holdsworth, Clovia I.; Molloy, Scott; Kundu, Sazal; Stockenhuber, Michael; Dlugogorski, Bogdan Z.

doi:10.1016/j.cej.2015.12.105

Cited by 4 publications

(3 citation statements)

References 22 publications

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“…The Cl-H bonding energy of CH 2 Cl 2 is 4.28 eV and is lower than the energy of metastable Ar (11.55 eV) produced by electron impact, as shown in reaction ( 9) [99]. Therefore, CH 2 Cl 2 is also possibly decomposed by Penning ionization by the energy transfer collision of metastable Ar (Ar*) as shown in the following reactions: [99,100].…”

Section: Decomposition Of Persistent Organic Pollutantsmentioning

confidence: 99%

A Novel Wastewater Treatment Method Using Electrical Pulsed Discharge Plasma over a Water Surface

Takahashi¹,

Takaki²,

Satta³

2022

Sewage - Recent Advances, New Perspectives and Applications

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Electrical pulsed discharge plasma produces various powerful oxidizing agents, such as hydroxyl radicals and ozone, which have high oxidation potential. These species play an important role in the decomposition of persistent organic compounds in wastewater. Because highly concentrated oxidants are directly produced inside the plasma, plasma realizes high-speed wastewater treatment without pretreatment of samples, such as pH adjustment. The pulsed discharge plasma generated over the water surface and inside bubbles is highlighted as a highly efficient method for plasma generation and radical supply into wastewater. In this paper, the physical and chemical properties of the discharge plasma generated over a water surface are described. The decomposition of persistent organic compounds dissolved in wastewater, such as 1,4-dioxane, formic acid, and dichloromethane, by plasma discharge is demonstrated, and their mechanisms are discussed. These persistent compounds, which have strong toxicity and stability, can be efficiently decomposed and removed quickly from solutions by plasma treatment. Furthermore, the treatment of nutrient solutions used in hydroponic systems for plant cultivation is also introduced as a novel application of plasma, and the effects of bacterial inactivation, decomposition of allelochemicals, and improvement in plant growth by plasma are demonstrated.

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Section: Decomposition Of Persistent Organic Pollutantsmentioning

confidence: 99%

A Novel Wastewater Treatment Method Using Electrical Pulsed Discharge Plasma over a Water Surface

Takahashi¹,

Takaki²,

Satta³

2022

Sewage - Recent Advances, New Perspectives and Applications

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“…It has been reported that 99.9% of HFC-134a and CF 4 can be decomposed by the use of plasma technology [12]. Moreover, undesirable byproducts, such as COF 2 have been reported to be controlled, and it is considered to be proficient in treating HFC-134a over a wide range of initial concentrations [13][14][15][16]. However, the high initial operating costs coupled with low energy efficiency restrain the dominance of this technology.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Catalyst Calcination Temperature on Catalytic Decomposition of HFC-134a over γ-Al2O3

Sheraz

Anus

et al. 2021

Catalysts

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This paper explores the thermal and catalytic pyrolysis of HFC-134a over γ-Al2O3 calcined at temperatures of 550 °C (A550), 650 °C (A650), 750 °C (A750), and 850 °C (A850). The physicochemical properties of catalysts were studied through thermogravimetric analysis (TGA), Brunauer–Emmett–Teller equation for nitrogen physisorption analysis (BET), X-ray diffraction (XRD), and temperature-programmed desorption of ammonia (NH3-TPD). The non-catalytic pyrolysis of HFC-134a showed less than 15% decomposition of HFC-134a. Catalysts increased the decomposition as A650 revealed the highest decomposition efficiency by decomposing more than 95% HFC-134a for 8 h followed by A750, A850, and A550. The larger surface area and pore volume paired with a low amount of strong acidic sites were considered as the main contributors to the comparatively longer catalytic activity of A650.

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“…The bonding energy of Cl-H of CH 2 Cl 2 is 4.28 eV, and is lower than the energy of Ar metastable (11.54 eV) 28). Therefore, CH 2 Cl 2 is also possibly decomposed by the Penning ionization by the energy transfer collision of Ar metastable (Ar*) as shown in following reactions;28,29) …”

mentioning

confidence: 99%

Decomposition process of volatile organic compounds dissolved into water by pulsed discharge inside bubble

Takahashi

Takayama

Yagi³

et al. 2020

Jpn. J. Appl. Phys.

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Decomposition process of volatile organic compound dissolved into water by discharge plasma inside bubble is investigated. The experiment is conducted on decomposition of dichloromethane (DCM). Argon or oxygen gas is injected into the water through a vertically positioned glass tube, in which high-voltage wire electrode is placed to generate plasmas at low applied voltage. The nanosecond pulsed high voltage generated by an inductive energy storage system pulsed power generator is applied to the tungsten wire to generate streamer discharge. Total organic carbon decreases and chloride ion concentration increases by the discharge treatment. To clarify the decomposition process, DCM and indigo carmine (IC) mixed solution is employed as specimen. The amount of IC decomposition decreases with increasing the DCM concentration. On the other hands, the amount of DCM decomposition is almost independent of IC concentration. These results show that DCM is quickly volatilized into the bubble, which is decomposed by hydroxyl radical produced by the discharge in gas phase inside bubble.

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Reaction of dichloromethane under non-oxidative conditions in a dielectric barrier discharge reactor and characterisation of the resultant polymer

Cited by 4 publications

References 22 publications

A Novel Wastewater Treatment Method Using Electrical Pulsed Discharge Plasma over a Water Surface

A Novel Wastewater Treatment Method Using Electrical Pulsed Discharge Plasma over a Water Surface

The Effect of Catalyst Calcination Temperature on Catalytic Decomposition of HFC-134a over γ-Al2O3

Decomposition process of volatile organic compounds dissolved into water by pulsed discharge inside bubble

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