Effect of NaCl concentration on an atmospheric glow discharge activated liquid activation by spectroscopic methods

doi:10.3969/j.issn.1000-1565.2020.04.004

Abstract

Abstract: Atmospheric pressure glow discharge has similar advantages owing to glow discharge obtained at low pressure, high chemical reactivity and being dispensable of expensive vacuum device. In particular, increasing attention is paid to atmospheric pressure glow discharge above liquid surface due to abundance with reactive species, which has extensive application potentials in many fields, including sterilization, plant growth, environmental protection, etc. In this paper, a needle-liquid electrode device with different concentrations of NaCl is used to generate atmospheric pressure glow discharge above solution. Optical emission spectra show that the liquid-electrode discharges with different NaCl concentrations present similar spectral lines, which mainly include the second system of nitrogen molecules(337.1 nm), the first negative system of nitrogen molecular ions(391.4 nm)and O I. However, intensity ratio of spectral lines is different. Furthermore the O I intensity, the intensity ratio(I_391.4/I_337.1)and vibrational temperature of discharge are measured by optical emission- DOI:10.3969/j.issn.1000-1565.2020.04.004光谱法研究盐溶液浓度对辉光放电活化液体的影响许慧敏^1,2,贾培佩¹,陈俊宇³,贾鹏英³,李小妮³(1.河北金融学院基础教学部,河北保定 071051;2.华北电力大学电力工程系,河北保定 071003;3.河北大学物理科学与技术学院,河北保定 071002)摘要:大气压辉光放电具有低气压辉光放电的均匀性和较高的化学活性,且摆脱了真空装置的限制.液面上的大气压辉光放电除了具有以上优点外,还具有活性粒子浓度高等优势,因此在材料改性、生物医疗等领域具有非常广泛的应用前景.本文采用针-液体电极直流放电装置,在液体电极上方产生了大气压辉光放电,并用于活化不同浓度的NaCl溶液.发射光谱表明,不同浓度液体电极放电均包含N₂的第二正带系、N⁺₂的第一负带系、OH自由基和O I.基于发射光谱,测量了液面附近的氧原子谱线强度、谱线强度比I_391.4/I_337.1和振动温度.利用吸收光谱测量了O₃浓度.发现它们均随着放电电流的增大而增大,且在一定电流下,随盐溶液浓度减小而增大.经过相同活化时间,溶液的H₂O₂浓度随着放电电流的增大而增大.在一定放电电流下,H₂O₂浓度随盐溶液浓度增大而减小.关键词:发射光谱;吸收光谱;溶液浓度;大气压辉光放电;振动温度中图分类号:O539 文献标志码:A 文章编号:1000-1565(2020)04-0360-05Effect of NaCl concentration on an atmospheric glow discharge activated liquid activation by spectroscopic methodsXU Huimin^1,2,JIA Peipei¹,CHEN Junyu³,JIA Pengying³,LI Xiaoni³(1. Department of Basic Teaching, Hebei Finance University, Baoding 071051, China;2.Department of Electrical Engineering, North China Electric Power University, Baoding 071003, China;3.College of Physics Science and Technology, Hebei University, Baoding 071002, China)Abstract: Atmospheric pressure glow discharge has similar advantages owing to glow discharge obtained at low pressure, high chemical reactivity and being dispensable of expensive vacuum device. In particular, increasing attention is paid to atmospheric pressure glow discharge above liquid surface due to abundance with reactive species, which has extensive application potentials in many fields, including sterilization, plant growth, environmental protection, etc. In this paper, a needle-liquid electrode device with different concentrations of NaCl is used to generate atmospheric pressure glow discharge above solution. Optical emission spectra show that the liquid-electrode discharges with different NaCl concentrations present similar spectral lines, which mainly include the second system of nitrogen molecules(337.1 nm), the first negative system of nitrogen molecular ions(391.4 nm)and O I. However, intensity ratio of spectral lines is different. Furthermore the O I intensity, the intensity ratio(I_391.4/I_337.1)and vibrational temperature of discharge are measured by optical emission- 收稿日期:2019-10-31 基金项目:国家自然科学基金资助项目(11575050;11875121;51977057);河北省自然科学基金资助项目(A2016201042);河北省研究生创新资助项目(CXZZBS2019023);保定市科技局科技计划项目(1911ZG014);河北金融学院科研项目(JY2016ZB42) 第一作者:许慧敏(1977—),女,河北博野人,河北金融学院讲师,博士,主要从事高电压技术方向研究.E-mail:xuhuimin@126.com第4期许慧敏等:光谱法研究盐溶液浓度对辉光放电活化液体的影响spectroscopy. Results show that the intensity ratio and vibrational temperature increase with increasing discharge current. For a given current, the intensity ratio and the vibrational temperature decrease with increasing NaCl concentration of liquid electrode. In addition, ozone concentration in gas phase is measured by UV absorption method, which increases with increase of discharge current. For a given current, it decreases with increasing NaCl concentration. In addition, H₂O₂concentration in solution increases with increasing discharge current. For a given current, it decreases with increasing NaCl concentration.

Key words: emission spectrum, absorption spectrum, solution concentration, atmospheric pressure glow discharge, vibration temperature

CLC Number:

O539

XU Huimin,JIA Peipei,CHEN Junyu,JIA Pengying,LI Xiaoni. Effect of NaCl concentration on an atmospheric glow discharge activated liquid activation by spectroscopic methods[J]. Journal of Hebei University (Natural Science Edition), 2020, 40(4): 360-364.

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