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Wen, Yuezhong; Jiang, Xinpeng

doi:10.1023/a:1007092211228

Cited by 14 publications

(5 citation statements)

References 7 publications

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“…As stated before, in a previous work, (3) results of degradation of acetophenone have shown that on the addition of gases, there are obvious increases in conversion of acetophenone. Therefore, the effects of gas flow rate need to be investigated.…”

Section: Effect Of Gas Flow Ratesupporting

confidence: 53%

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Degradation of Organic Contaminants in Water by Pulsed Corona Discharge

Wen

Liu

et al. 2005

Plasma Chem Plasma Process

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Degradation of organic contaminants in water by high-voltage pulse discharges was investigated. The effects of gas flow rate and liquid conductivity on the degradation of 4-chlorophenol were studied. With the increase of time, the liquid conductivity increases, which have an important effect on discharge. Meanwhile, with the increase of time, the concentration of H 2 O 2 increases. Addition of 200 mg/L H 2 O 2 , the conversion of 4-chlorophenol was greatly enhanced. This may be due to the synergistic effect of high-voltage pulsed discharge and H 2 O 2 . Also, it was found that the influence of quantity of TiO 2 or CuO on degradation of acetophenone is not apparent, maybe the presence of metal oxides hinders the formation of plasma channel due to increase of collusions between metal oxides and oxygen.

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Section: Effect Of Gas Flow Ratesupporting

confidence: 53%

“…(1,2,3) The pulsed corona discharge makes it possible to produce a plasma, which generates various active species ( • OH, • O, • H, • HO 2 , O − 2 etc.). The pulsed discharge used in the liquid is usually either an arc discharge or a spark discharge when gas is not introduced.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Organic Contaminants in Water by Pulsed Corona Discharge

Wen

Liu

et al. 2005

Plasma Chem Plasma Process

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“…The chemically active species, in turn, rapidly degrade the organic pollutants dissolved in an aqueous solution. Previous studies have demonstrated that various compounds, such as phenol, acetophenone, and organic dyes, etc., could be satisfactorily removed in PCD ( 5 − 7 , − . However, the PCD process seems to perform best in water with lower conductivity ( , ), which is not suitable for real wastewater that contains salts.…”

Section: Introductionmentioning

confidence: 99%

Phenol Degradation by a Nonpulsed Diaphragm Glow Discharge in an Aqueous Solution

Liu

Jiang

2005

Environ. Sci. Technol.

101

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In the present study, a nonpulsed direct current diaphragm glow discharge process was developed for the first time for phenol degradation in an aqueous solution. The discharge was generated in a small hole in a dielectric diaphragm interposed between two submersed graphite electrodes. The experimental results revealed that supplied voltage, initial pH, iron salts, and radical scavengers impact the phenol degradation significantly. Enhancing the applied voltage, lowering the solution pH, and adding appropriate amounts of Fe2+ or Fe3+ to the solution were found to be favorable for phenol degradation. Carbonate ions or n-butanol in the solution can decelerate the phenol removal. When the treatment time is increased, the pH value of the solution decreased, leading to an increase in the phenol decomposition. It was revealed by high performance liquid chromatography and ionic chromatography that the main intermediates of phenol decomposition are hydroquinone, pyrocatechol, p-benzoquinone and organic acids. In comparison with the high-voltage corona discharge plasma in distilled water, this process offers simple technology, higher energy efficiency, easier scaleup, and easier applicability to salt-containing wastewater with no electrode erosion and electromagnetic radiation.

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“…One of the most promising research themes concerns the interaction between a gaseous plasma and liquid-phase. Actually, a great deal of attention has been devoted to an organic S. Tomizawa Á M. Tezuka (&) Department of Applied Chemistry, Saitama Institute of Technology, 1690 Fusaiji, Fukaya, Saitama 369-0293, Japan e-mail: tezuka@sit.ac.jp or inorganic transformation in a solution caused by gaseous plasmas from diversified viewpoints such as chemical evolution [1][2][3][4], oil refining [5,6], water purification [7][8][9][10] and so on. The authors have attempted to exploit the effective methods for the removal of hazardous chemicals by means of gaseous plasma sustained in contact with the solution.…”

Section: Introductionmentioning

confidence: 99%

Kinetics and Mechanism of the Organic Degradation in Aqueous Solution Irradiated with Gaseous Plasma

Tomizawa

Tezuka

2007

Plasma Chem Plasma Process

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The degradation of organic compounds in an aqueous solution induced by a gaseous plasma, which was sustained locally on the surface of solution by means of contact glow discharge electrolysis, was mechanistically studied. The oxidation of phenol was extensively examined and it was revealed that the rate of disappearance followed the firstorder rate law when the initial concentration of phenol was lower than 100 mM. As the initial concentration increased, the rate equation gradually deviated from the first-order and eventually shifted to zero-order above 250 mM. Such a kinetical behavior could be rationalized by assuming the reaction scheme where hydroxyl radical would act as the most responsible key-species for the organic degradation in competition with the coupling to hydrogen peroxide. In addition, the catalytic effects of Fe ions in the solution on the rate of organic degradation were closely investigated and could be consistently explained on the above concept.

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Untitled

Cited by 14 publications

References 7 publications

Degradation of Organic Contaminants in Water by Pulsed Corona Discharge

Degradation of Organic Contaminants in Water by Pulsed Corona Discharge

Phenol Degradation by a Nonpulsed Diaphragm Glow Discharge in an Aqueous Solution

Kinetics and Mechanism of the Organic Degradation in Aqueous Solution Irradiated with Gaseous Plasma

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