Effect of activated carbon addition on H2O2 formation and dye decoloration in a pulsed discharge plasma system

Wang, Huijuan; Guo, He; Wu, Qiangshun; Zhou, Guangshun; Yi, Chengwu

doi:10.1016/j.vacuum.2016.03.015

Cited by 46 publications

(17 citation statements)

References 27 publications

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“…The measured H 2 O 2 concentrations are 37.5 and 8 μmol/L, for an electrode distance of 4.1 and 14.3 mm, respectively. Similar results have been obtained by Wang et al, [28] although, in their case, bubbles are injected in their plasma experiment. In addition, it is observed that the plasma emission is much brighter when the short electrode distance is used.…”

Section: Resultssupporting

confidence: 88%

Chemistry in nanosecond plasmas in water

Chauvet

Nenbangkaeo

Grosse

et al. 2020

Plasma Processes & Polymers

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Discharges in liquids are the basis of a range of applications in electrochemistry, wastewater treatment, or plasma medicine. One advantage of discharges in water is their ability to produce radicals and molecules directly inside liquid with a high conversion efficiency. In this study, H 2 O 2 production in a 10 ns pulsed discharge in water is investigated. The dynamic of these discharges is based on plasma ignition directly inside liquid followed by the formation of a bubble that expands in time before it eventually collapses. This sequence can be well described by cavitation theory. H 2 O 2 is produced using different plasma conditions varying the treatment time, the pulse frequency between 1 and 100 Hz, and the applied voltage in a range from 15-30 kV. The resulting H 2 O 2 concentration is measured using absorption spectroscopy ex situ based on a colorimetry method. The results indicate that the main parameter controlling the H 2 O 2 production constitutes the applied voltage. The measured concentrations are compared with a global chemistry model simulating the chemistry involved during a single pulse using pressures and temperatures from the cavitation model. In addition, a global chemical equilibrium model for H 2 O 2 creation is evaluated as well. The models show a good agreement with the data.The energy efficiency for the production of H 2 O 2 reaches values up to 2 g/kWh. K E Y W O R D S cavitation theory, discharge in water, global chemistry model, H 2 O 2 production, nanosecond pulsed discharge ---

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Section: Resultssupporting

confidence: 88%

Chemistry in nanosecond plasmas in water

Chauvet

Nenbangkaeo

Grosse

et al. 2020

Plasma Processes & Polymers

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“…The enhanced glyphosate removal by increasing the current density could be attributed to the increase in the production of H 2 O 2 (Fig. 4D), subsequently, which resulted in the enhancement of OH generation since the production of OH is proportional to the H 2 O 2 concentration (Qiu et al, 2015;Wang et al, 2016). A notable pH effect on the degradation of glyphosate was observed (Fig.…”

Section: Parameters Affecting the Performance Of The Acf-ef Processmentioning

confidence: 88%

An activated carbon fiber cathode for the degradation of glyphosate in aqueous solutions by the Electro-Fenton mode: Optimal operational conditions and the deposition of iron on cathode on electrode reusability

et al. 2016

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a b s t r a c tAn activated carbon fiber (ACF) cathode was fabricated and used to treat glyphosate containing wastewater by the Electro-Fenton (EF) process. The results showed that glyphosate was rapidly and efficiently degraded and the BOD 5 /COD ratio was increased to >0.3 implying the feasibility of subsequent treatment of the treated wastewater by biological methods. The results of ion chromatography and HPLC measurements indicated that glyphosate was completely decomposed. Effective OH generation and rapid recycling/recovery of the Fe 2þ ions at the cathode were responsible primarily for the high performance of the ACF-EF process. Factors such as inlet oxygen gas flow rate, Fe 2þ dosage, initial glyphosate concentration, applied current intensity, and solution pH that may affect the efficiency of the ACF-EF process were further studied and the optimum operation condition was established. Results of SEM/EDX, BET and XPS analysis showed the deposition of highly dispersed fine Fe 2 O 3 particles on the ACF surface during the EF reaction. The possibility of using the Fe 2 O 3 -ACF as iron source in the EF process was assessed. Results showed that the Fe 2 O 3 -ACF electrode was effective in degrading glyphosate in the EF process. The deposition of Fe 2 O 3 particles on the ACF electrode had no adverse effect on the reusability of the ACF cathode.

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“…Wang et al developed a pulsed discharge plasma system suitable for organic dye decoloration [102]. The developed system is shown in Fig.…”

Section: B Azo Dye Decompositionmentioning

confidence: 99%

A Review of Pulsed Power Systems for Degrading Water Pollutants Ranging From Microorganisms to Organic Compounds

2019

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Water quality improvement and collecting safe water are two of the paramount concerns in today's world. Numerous water treatment and pollutant removal processes are introduced that vary with the type of pollutants. Among the proposed pollutant degradation methods, pulsed power is one of the effective methods that can be applied not only to degrade a wide range of contaminants but also to address the environmental issues associated with water treatment chemicals. The effectiveness of the pulsed power technology in water treatment was studied for a wide range of pollutants including microorganisms, nutrient pollution, emerging pollutants, and organic pollutants. This paper presents a review of pulsed power systems developed for organic and inorganic pollutants degradation in different water treatment applications. Also, it presents the effectiveness of several factors like the electrical characteristics of the pulse voltages and treatment time on degradation rates of different pollutants.

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Effect of activated carbon addition on H2O2 formation and dye decoloration in a pulsed discharge plasma system

Cited by 46 publications

References 27 publications

Chemistry in nanosecond plasmas in water

Chemistry in nanosecond plasmas in water

An activated carbon fiber cathode for the degradation of glyphosate in aqueous solutions by the Electro-Fenton mode: Optimal operational conditions and the deposition of iron on cathode on electrode reusability

A Review of Pulsed Power Systems for Degrading Water Pollutants Ranging From Microorganisms to Organic Compounds

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