Characteristics of gas-liquid diaphragm discharge and its application on decolorization of brilliant red B in aqueous solution

Qingsong GAO (高青松); Yongjun LIU (刘永军); Bing SUN (孙冰)

doi:10.1088/2058-6272/aa8593

Plasma Science and Technology > 2017 > 19(11): 115404. > DOI: 10.1088/2058-6272/aa8593

Qingsong GAO (高青松), Yongjun LIU (刘永军), Bing SUN (孙冰). Characteristics of gas-liquid diaphragm discharge and its application on decolorization of brilliant red B in aqueous solution[J]. Plasma Science and Technology, 2017, 19(11): 115404. DOI: 10.1088/2058-6272/aa8593

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Characteristics of gas-liquid diaphragm discharge and its application on decolorization of brilliant red B in aqueous solution

College of Environmental Science & Engineering, Dalian Maritime University, Dalian 116026, People’s Republic of China

Funds: This work was supported by the Fundamental Research Funds for the Central Universities (3132016056), the Natural Science Foundation of Fujian province, China (No. 2015J01651), and National Natural Science Foundation of China (No. 11005014).

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Received Date: May 18, 2017

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Abstract

Abstract

A simple gas-liquid diaphragm discharge reactor was designed and characteristics of the discharge and its application on decolorization of brilliant red B in an aqueous solution were investigated. The results showed that strong oxidizing agents such as •OH and •O radicals were generated. Average electron temperature of the discharge was 0.72 eV, 1.15 eV and 0.83 eV with air, oxygen and argon as the discharge gas, respectively. Solution pH and conductivity changed little when oxygen or argon was used as the discharge gas; however, these two parameters changed significantly when the discharge was performed in air. During the discharge treatment, the characteristic absorption peaks of brilliant red B gradually decreased where the decolorization followed the first-order kinetics. With 10 min of discharge, the decolorization of brilliant red B (30 mg L^-1) can reach 96%, 81% and 62% in the cases of oxygen, argon and air, respectively. The analysis of by-products showed that the brilliant red B molecule can be effectively destroyed in this discharge mode.
- gas-liquid diaphragm discharge,
- brilliant red B,
- decolorization

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References (28)

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