Effect of electrode materials on degradation of methylene blue wastewater by DBD plasma under parallel magnetic field
JIN Dong-han1,2, LU Hong-wei1,2
1. College of Science, Donghua University, Shanghai 201620, China;
2. Key Laboratory of Advanced Plasma Technology and Application in Textile, Donghua University, Shanghai 201620, China
The methylene blue aqueous solution has been treated by dielectric barrier discharge plasma technique as simulated wastewater. Nickel, iron, molybdenum and stainless steel were used as electrodes. The effects of different electrode materials on the degradation rate and energy efficiency were investigated under parallel magnetic field. It has been found that the difference in electrode materials could affect the degradation of methylene blue. For the nickel electrode, the degradation rate of methylene blue could reach 99% after 8min treatment, which could induce the best effect of degradation. The electrode material could also affect the promotion of parallel magnetic field on the degradation of methylene blue. The energy efficiency of iron and nickel electrodes could increase 20% compared to no magnetic field, while molybdenum and stainless steel only 5%~10%. By applying the mechanism of the dielectric barrier discharge (DBD) plasma and the secondary electron emission theories, it has been found that these differences were caused by the differences in secondary emission coefficient and magnetic permeability of the electrode material. The secondary emission coefficient of nickel is the largest among the four materials, so it has the best degradation effect. Iron and nickel had larger magnetic permeability, and the magnetic induction intensity in the discharge space was higher, which induced the more definite improvement of the parallel magnetic field on the degradation rate and energy efficiency of methylene blue.
金东翰, 卢洪伟. 平行磁场下电极材料对DBD降解亚甲基蓝的影响[J]. 中国环境科学, 2020, 40(4): 1570-1576.
JIN Dong-han, LU Hong-wei. Effect of electrode materials on degradation of methylene blue wastewater by DBD plasma under parallel magnetic field. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(4): 1570-1576.
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