Discoloration of Congo Red by Rod-Plate Dielectric Barrier Discharge Processes at Atmospheric Pressure

WU Haixia (武海霞); FANG Zhi (方志); ZHOU Tong (周侗); LU Chen (陆晨); XU Yanhua (徐炎华)

doi:10.1088/1009-0630/18/5/10

Plasma Science and Technology > 2016 > 18(5): 500-505. > DOI: 10.1088/1009-0630/18/5/10

WU Haixia (武海霞), FANG Zhi (方志), ZHOU Tong (周侗), LU Chen (陆晨), XU Yanhua (徐炎华). Discoloration of Congo Red by Rod-Plate Dielectric Barrier Discharge Processes at Atmospheric Pressure[J]. Plasma Science and Technology, 2016, 18(5): 500-505. DOI: 10.1088/1009-0630/18/5/10

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Discoloration of Congo Red by Rod-Plate Dielectric Barrier Discharge Processes at Atmospheric Pressure

1 College of Urban Construction, Nanjing Tech University, Nanjing 210009, China 2 School of Automation and Electrical Engineering, Nanjing Tech University, Nanjing 210009, China 3 Jiangsu Provincial Academy of Environmental Science, Nanjing 210009, China 4 College of Environment, Nanjing Tech University, Nanjing 210009, China

Funds: supported by National Natural Science Foundation of China (No. 51377075), the Natural Science Foundation of Jiangsu Province of China (Nos. BK20131412, BK20150951)

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Received Date: September 08, 2015

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Abstract

Abstract

A dielectric barrier discharge (DBD) reactor with a rod-plate electrode configuration was used for the oxidative decomposition of Congo red dye in an aqueous solution. Plasma was generated in the gas space above the water interface under atmospheric pressure. Discharge characteristics were analyzed by voltage-current waveforms. Effects of applied voltage, initial conductivity, and initial concentration were also analyzed. Congo red discoloration increased with increased applied voltage and decreased conductivity. The initial conductivity significantly influenced the Congo red discoloration. Under the same conditions, the highest discoloration rate was obtained at 25 mg/L. The presence of ferrous ions in the solutions had a substantial positive effect on Fenton dye degradation and flocculation. At an applied voltage of 20 kV, about 100% of dye was degraded after 4 min of Fe²⁺ /DBD treatment. Results showed that adding a certain dosage of hydrogen peroxide to the wastewater could enhance the discoloration rate. Possible pathways of Congo red discoloration by DBD plasma were proposed based on GC/MS, FTIR, and UV-vis spectroscopy analyses.
- dielectric barrier discharge (DBD),
- Congo red (CR),
- discoloration,
- wastewater treatment

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References

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