Remediation of p-nitrophenol and pentachlorophenol mixtures contaminated soil using pulsed corona discharge plasma

Wang, Tie Cheng; Qu, Guangzhou; Li, Jie; Liang, Dong

doi:10.1016/j.seppur.2013.10.043

Cited by 16 publications

(4 citation statements)

References 23 publications

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“…Corona discharge plasma technology, as one of the advanced oxidation processes, has been widely applied to treat polluted water . It has attracted the attention of many researchers for decades and is considered a promising technology for degrading refractory organic pollutants . In the discharge process, electrical energy is converted into forms of energetic electrons, intense electric fields, optical radiation, etc.…”

Section: Introductionmentioning

confidence: 99%

Decomposition of tetracycline in aqueous solution by corona discharge plasma combined with a Bi₂MoO₆nanocatalyst

Sun

et al. 2014

J. Chem. Technol. Biotechnol.

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BACKGROUND A new method of tetracycline (TC) degradation by corona discharge plasma with a suspended Bi2MoO6 catalyst was investigated. The flake‐like structure particles were successfully synthesized by a solvent‐thermal method and analyzed by XRD, SEM, TEM, BET and XRF. The catalytic activity, the reaction mechanisms, the intermediates of TC degradation and the proposed pathway were also evaluated for the reaction process. RESULT The removal rate of 250 mL TC with 50 mg L−1 was enhanced from 62% to 96% in 24 min with the addition of Bi2MoO6 in the range 0–1.5 g L−1, under a discharge input power of 36.0 W. The corresponding removal rate of TOC increased from 25% to 61%, and 95% of the catalyst (1.0 g L−1) was settled in 60 min. CONCLUTIONS It was shown that a synergistic effect existed between corona discharge plasma and Bi2MoO6 in the process of TC degradation. The intermediates and a possible degradation pathway of TC were determined based on LC‐MS analysis. The study proposes an efficient technology and degradation mechanism for TC wastewater treatment. © 2014 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 99%

Decomposition of tetracycline in aqueous solution by corona discharge plasma combined with a Bi₂MoO₆nanocatalyst

Sun

et al. 2014

J. Chem. Technol. Biotechnol.

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“…After the study, the authors carried out further investigations in order to understand the influence of gaseous ozone transport (Wang et al, 2014b) and soil depth (Wang et al, 2014c) on PCP degradation. Wang et al (2014a) found that the use of corona pulsed discharge plasma removed 86 and 94.1% of p-nitrophenol (PNP) and pentachlorophenol (PCP), respectively, from contaminated soils. The mixture of contaminants was treated under the conditions of discharge voltage of 18 kV, pulse frequency of 50 Hz, capacitance of 200 pF, and energy input per pulse of 0.018 J, with an initial concentration of pollutants of 600 mg kg -1 (50% of each pesticide).…”

Section: Plasma Oxidation and Ozonationmentioning

confidence: 99%

“…However, treatment efficiency decreases at higher concentrations, requiring more energy. By assessing the efficiency in the same treatment, but with different initial concentrations, the authors concluded that treatment efficiency decreases at higher concentrations, requiring more energy (Wang et al, 2014a).…”

Section: Plasma Oxidation and Ozonationmentioning

confidence: 99%

Remediation of Soils Contaminated by Pesticides Using Physicochemical Processes: a Brief Review

et al. 2019

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After years of pesticide application, often indiscriminately, damage has been caused to the environment, as well as to agronomic crops grown in contaminated areas. In water treatment, techniques based on physical and/or physicochemical processes are used, being formed secondary oxidizing agents responsible for the mineralization of contaminants present in the herbicides, thus causing the degradation process. However, few studies have demonstrated the effectiveness of these techniques in soils. The aim of this study was to review the existing studies, presenting the main techniques used for remediation of soils contaminated with pesticides. Emphasis was placed on electrokinetics, advanced oxidative processes, soil washing, chemical or solvent extraction, and combinations of these methods. According to the results of several studies, the combination of techniques, such as electrokinetics and soil washing processes, allows achieving a high efficiency when it is applied for the degradation of agricultural contaminants. The combination of electrolysis with other methods, such as the Fenton’s reagent, ultrasound irradiation, and UV light, also present satisfactory results in removing pesticides in soil treatment. However, Fenton technology used alone is the most promising of the assessed techniques since it can be used for the remediation of several contaminants, especially pesticides, not harming the environment and allowing soil recovery.

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“…However, current research on soil remediation mainly focuses on decomposing mechanism of specific pollutants and the treatment effect on pollutants, including pollutant removal efficiency [19], chemical reaction pathway [20,21] and the effect of external factors such as humidity, temperature, electrical polarity and soil characteristics [22][23][24]. The study on the physical and chemical mechanism of discharge in soil itself is still scarce.…”

Section: Introductionmentioning

confidence: 99%

Discharge characteristics in soil under positive pulse voltage superimposed DC component

Yang¹,

Pi²,

Li³

et al. 2022

J. Phys. D: Appl. Phys.

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Considerable research efforts have been devoted to the study of the application of atmospheric discharge in soil remediation. Most of them focused on how to improve the degradation efficiency of specific pollutants. In contrast, the generation and development of discharge in soil is less studied, which restricts the widespread application of soil remediation. Pulse voltage is widely used to trigger discharge in soil, but the requirement for the power supply is relatively high. The current paper proposes a new form of discharge voltage, with positive pulse voltage superimposed on DC bias. The results show that the existence of DC component can effectively lower the required pulse voltage and enlarge the active corona volume, in which area most ionization and excitation happens. The characteristics of corona discharge in soil under DC voltage only, pulse voltage only and superimposed voltage with various voltage components are discussed in detail, according to the volt-ampere characteristics and discharge images from a series of experiments. The mechanism behind the experimental phenomenon are also discussed.

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Remediation of p-nitrophenol and pentachlorophenol mixtures contaminated soil using pulsed corona discharge plasma

Cited by 16 publications

References 23 publications

Decomposition of tetracycline in aqueous solution by corona discharge plasma combined with a Bi₂MoO₆nanocatalyst

Decomposition of tetracycline in aqueous solution by corona discharge plasma combined with a Bi₂MoO₆nanocatalyst

Remediation of Soils Contaminated by Pesticides Using Physicochemical Processes: a Brief Review

Discharge characteristics in soil under positive pulse voltage superimposed DC component

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Remediation of p-nitrophenol and pentachlorophenol mixtures contaminated soil using pulsed corona discharge plasma

Cited by 16 publications

References 23 publications

Decomposition of tetracycline in aqueous solution by corona discharge plasma combined with a Bi2MoO6nanocatalyst

Decomposition of tetracycline in aqueous solution by corona discharge plasma combined with a Bi2MoO6nanocatalyst

Remediation of Soils Contaminated by Pesticides Using Physicochemical Processes: a Brief Review

Discharge characteristics in soil under positive pulse voltage superimposed DC component

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Product

Resources

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Decomposition of tetracycline in aqueous solution by corona discharge plasma combined with a Bi₂MoO₆nanocatalyst

Decomposition of tetracycline in aqueous solution by corona discharge plasma combined with a Bi₂MoO₆nanocatalyst