Degradation of Phenol by Simultaneous Use of Gas-Phase Corona Discharge and Catalyst-Supported Mesoporous Carbon Gels

Sano, Noriaki; Yamamoto, Takuji; Takemori, Isamu; Kim, Seong-Ick; Eiad-Ua, Apiluck; Yamamoto, and Daisuke; Nakaiwa, Masaru

doi:10.1021/ie050406q

Cited by 14 publications

(9 citation statements)

References 14 publications

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“…Several methods for PFOA decomposition have been reported, including ultraviolet-induced photochemical reactions [4], ultrasonic cavitation [5], 185 nm vacuum ultraviolet light [6], and sulfate radicals [7]. There are many methods for water treatment using plasmas [8][9][10][11][12][13][14][15][16][17]. We recently found that plasma generated at the gas-liquid interface can easily decompose PFOA [18,19].…”

Section: Introductionmentioning

confidence: 99%

Relationship Between Reaction Rate of Perfluorocarboxylic Acid Decomposition at a Plasma–Liquid Interface and Adsorbed Amount

Matsuya

Takeuchi

Yasuda

2014

Electrical Engineering Japan

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SUMMARY Perfluorooctanoic acid (PFOA: C7F15COOH) in water is effectively decomposed by plasma generated at a gas–liquid interface. During the decomposition of PFOA, perfluorocarboxylic acids (PFCAs: normalCnnormalF2n+1 COOH ) with shorter carbon chains (n = 1–6) are generated as by‐products. Since these PFCAs are surfactants, they are adsorb onto the gas–liquid interface and show high surface concentrations. This study investigated the relationship between the adsorbed amount of PFCA and the rate of decomposition by a direct current plasma. The adsorbed amount of PFCA at the gas–liquid interface increased as the length of the carbon chain increased, resulting in a higher rate of decomposition. However, the reaction rate reached saturation at a certain adsorption amount, depending on the discharge current.

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Section: Introductionmentioning

confidence: 99%

Relationship Between Reaction Rate of Perfluorocarboxylic Acid Decomposition at a Plasma–Liquid Interface and Adsorbed Amount

Matsuya

Takeuchi

Yasuda

2014

Electrical Engineering Japan

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“…Several efforts to degrade phenol have been undertaken using various techniques but some important methods involve the application of electromagnetic [47,48], laser [49,50] photocatalytic [51][52][53][54], mechanochemical [55], electro-catalytic [56][57][58][59], photo-electrocatalytic [60], biodegradation [61][62][63][64][65][66][67][68][69][70][71], advanced oxidation process [72] and glow discharge plasma [73][74][75] processes. However, in the following section, various sonochemical methods, used for the degradation of phenol in aqueous solutions, would be discussed.…”

Section: Remediation Methods Of Phenolmentioning

confidence: 99%

Sonochemical Degradation of Phenol in the Presence of Inorganic Catalytic Materials

Pankaj

Verma²

2010

Theoretical and Experimental Sonochemistry Involving Inorganic Systems

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Degradation of phenol in its aqueous solutions, using various techniques, including ultrasound, have been examined and discussed to better understand the mechanisms involved therein and the advantages as well as the disadvantages associated with the use of inorganic catalytic materials. IntroductionSonochemical degradation of organic molecules [1], employing cavitational effect is not new. Many simple [2] and complex molecules [3] from modest to very high toxicity levels, polluting the aquatic life and the environment have been successfully reduced to relatively non-toxic or lesser harmful species, if not degraded completely by the ultrasound. Although the degree of degradation and the duration of sonication varied considerably, depending upon the nature of moieties, but the sonochemical degradation undergoes either without the addition of extra chemicals or involves the minimum amounts of non-toxic chemicals such as photocatalyst TiO 2 , Fenton's reagent etc., hence can be termed as a green technology. The purpose of this article is to review the sonochemical degradation of phenol, under different experimental conditions and in the presence of several other active chemicals to understand better the mechanisms involved in all such processes.Phenol is an important chemical, from the point of its industrial and commercial applications, but is of great environmental apprehension due to its toxicity. Its chemical name is hydroxybenzene which is more acidic compared to aliphatic alcohols hence is also known as carbolic acid [4]. At ambient temperature and pressure it is a hygroscopic crystalline solid, which is colourless when pure [5] but

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“…26,30À32 According to our previous observations of a small corona-discharge reactor using a mesoporous carbon disk as an anode, the use of a carbon anode having a high surface area can significantly improve the purification performance in phenol degradation. 32 Another previous study revealed that using a cylindrical anode can significantly increase the energy efficiency of a corona-discharge reactor. 30 From these results, we expect that using a cylindrical anode made of carbon having a high surface area may further improve the performance of a coronadischarge reactor.…”

Section: Introductionmentioning

confidence: 99%

“…We have been making efforts to develop a water purification reactor based on corona discharge because of its high reactivity and simplicity. ,− According to our previous observations of a small corona-discharge reactor using a mesoporous carbon disk as an anode, the use of a carbon anode having a high surface area can significantly improve the purification performance in phenol degradation . Another previous study revealed that using a cylindrical anode can significantly increase the energy efficiency of a corona-discharge reactor .…”

Section: Introductionmentioning

confidence: 99%

Application of Multiwalled Carbon Nanotubes in a Wetted-Wall Corona-Discharge Reactor To Enhance Phenol Decomposition in Water

Sano

Yamane

Hori

et al. 2011

Ind. Eng. Chem. Res.

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A wetted-wall corona-discharge reactor can be used to decompose toxic organic compounds in water using reactive radicals and ozone. In this study, multiwalled carbon nanotubes (MWCNTs) were synthesized directly on the surface of a cylindrical stainless steel anode in this type of reactor to improve its decomposition performance. The surface area of the anode including the synthesized MWCNTs became approximately 332 times larger than that of the bare stainless steel anode. This increase in surface area enhanced the rate at which the phenol concentration decreased, although the degradation rate of total organic carbon (TOC) did not increase. When cobalt nanoparticles were loaded onto these MWCNTs, the TOC degradation rate improved significantly. The synthesis of MWCNTs on the anode surface was necessary to realize this enhancement. This study discusses the mechanisms of these enhancement effects.

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Degradation of Phenol by Simultaneous Use of Gas-Phase Corona Discharge and Catalyst-Supported Mesoporous Carbon Gels

Cited by 14 publications

References 14 publications

Relationship Between Reaction Rate of Perfluorocarboxylic Acid Decomposition at a Plasma–Liquid Interface and Adsorbed Amount

Relationship Between Reaction Rate of Perfluorocarboxylic Acid Decomposition at a Plasma–Liquid Interface and Adsorbed Amount

Sonochemical Degradation of Phenol in the Presence of Inorganic Catalytic Materials

Application of Multiwalled Carbon Nanotubes in a Wetted-Wall Corona-Discharge Reactor To Enhance Phenol Decomposition in Water

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