|
|
|
| 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 |
|
|
|
|
Abstract 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.
|
|
Received: 17 September 2019
|
|
|
|
|
|
| [1] |
陈明功,齐永涛,张鑫敏,等.低温等离子体与絮凝剂处理印染废水的协同效应[J]. 中国环境科学, 2010,30(9):1207-1212. Chen M G, Qi Y T, Zhang X M, et al. Cooperation effect between non-thermal plasma and flocculants for treatment dyeing wastewater[J]. China Environmental Science, 2010,30(9):1207-1212.
|
| [2] |
曹宝,罗宏,王秀波.中国水污染物排放特征及其环境经济分析[J]. 中国人口·资源与环境, 2010,20(3):261-264. Cao B, Luo H, Wang X B. Water pollutant discharge characteristics and environmental economic analysis in China[J]. China Population, Resources and Environment, 2010,20(3):261-264.
|
| [3] |
Li D, Haneda H, Hishita S, et al. Visible-light-driven N-F-codoped TiO2 photocatalysts. 2. Optical characterization, photocatalysis, and potential application to air purification[J]. Chemistry of Materials, 2005,17(10):2596-2602.
|
| [4] |
A11. D V C, Finazzi E, Pacchioni G, et al. Density functional theory and electron paramagnetic resonance study on the effect of N-F codoping of TiO2[J]. Chemistry of Materials, 2008,20(11):3706.
|
| [5] |
Asahi R, Morikawa T, Ohwaki T. Visible-light photocatalysis in Nitrogen-Doped Titanium Oxides[J]. Science, 2001,293(5528):269-271.
|
| [6] |
Mwabora J M. Photoelectrochemical and optical properties of nitrogen doped titanium dioxide prepared by reactive D.C. magnetron sputtering[J]. J.phys.chem.b, 2007,107(24):5709-5716.
|
| [7] |
Yamaki T, Umebayashi T, Sumita T, et al. Fluorine-doping in titanium dioxide by ion implantation technique[J]. Nuclear Instruments & Methods in Physics Research. B, Beam Interactions with Materials and Atoms, 2003,206(3):254-258.
|
| [8] |
李胜利,李劲,王泽文,等.用高压脉冲放电等离子体处理印染废水的研究[J]. 中国环境科学, 1996,16(1):73-76. Li S L, Li J, Wang Z W, et al. Study on treatment of dyeing wastewater by high voltage pulse discharge plasma[J]. China Environmental Science, 1996,16(1):74-76.
|
| [9] |
Nickelsen M G, Cooper W J, Kurucz C N, et al. Removal of benzene and selected alkyl-substituted benzenes from aqueous solution utilizing continuous high-energy electron irradiation[J]. Environmental Science & Technology, 1992,26(1):144-152.
|
| [10] |
Kim Y K, Kim S A, Lee S B, et al. Decomposition of ethylenediaminetetraacetic acid using He-Ar-O2 dielectric barrier discharge[J]. Plasma Processes & Polymers, 2005,2(3):252-255.
|
| [11] |
Jing X, Chen L I, Wang H. Degradation mechanism of Alizarin Red in hybrid gas-liquid phase dielectric barrier discharge plasmas:Experimental and theoretical examination[J]. Chemical Engineering Journal, 2008,138(1):120-127.
|
| [12] |
Feng Z, Saeki N, Kuroki T, et al. Magnetic-field-assisted gliding arc discharge plasma for surface modification[J]. IEEE Transactions on Plasma Science, 2011,39(11):2846-2847.
|
| [13] |
Gangoli S P, Gutsol A F, Fridman A A.A non-equilibrium plasma source:magnetically stabilized gliding arc discharge:I. Design and diagnostics[J]. Plasma Sources Science & Technology, 2010,19(6):065003.
|
| [14] |
Jiang W, Jie T, Wang Y, et al. A low-power magnetic-field-assisted plasma jet generated by dielectric-barrier discharge enhanced direct-current glow discharge at atmospheric pressure[J]. Applied Physics Letters, 2014,104(013505):1-4.
|
| [15] |
Wang C, Zhang G, Wang X, et al. Surface modification of poly(ethylene terephthalate) (PET) by magnet enhanced dielectric barrier discharge air plasma[J]. Surface & Coatings Technology, 2011, 205(21):4993-4999.
|
| [16] |
Qiao Y, Li B, Ouyang J. On the mechanism of pattern formation in glow dielectric barrier discharge[J]. Physics of Plasmas, 2016,23(1):33-51.
|
| [17] |
Mizuno A, Clements J S, Davis R H. A method for the removal of sulfur dioxide from exhaust gas utilizing pulsed streamer corona for electron energization[J]. IEEE Transactions on Industry Applications, 2008,22(3):516-522.
|
| [18] |
蔡忆昔,王军,刘志楠,等.介质阻挡放电等离子体发生器的负载特性[J]. 高电压技术, 2006,32(10):62-64. Cai Y X, Wang J, Liu Z N, et al. Load characteristics of a dielectric barrier discharge plasma generator[J]. High Voltage Technology, 2006,32(10):62-64.
|
| [19] |
Radu I, Bartnikas R, Wertheimer M R. Diagnostics and modelling of noble gas atmospheric pressure dielectric barrier discharges in homogeneous or diverging electric fields[J]. Journal of Physics D Applied Physics, 2005,38(4):539-546.
|
| [20] |
Massines F, Rabehi A, Decomps P, et al. Experimental and theoretical study of a glow discharge at atmospheric pressure controlled by dielectric barrier[J]. Journal of Applied Physics, 1998,83(6):2950-2975.
|
| [21] |
金心宇,张昱,姜玄珍,等.电极材料对脉冲等离子体降解有机废气的影响分析[J]. 中国环境科学, 1998,18(3):213-217. Jin X Y, Zhang Y, Jiang X Z, et al. Analysis of electrode material effect on organic exhaust gas decomposition by pulsed plasma[J]. China Environmental Science, 1998,18(3):213-217.
|
|
|
|
