微波液相放电等离子体发射光谱研究

发布时间：2018-02-11 09:27

本文关键词： 微波液相等离子体发射光谱 OH自由基　出处：《光谱学与光谱分析》2017年12期 　论文类型：期刊论文

【摘要】：液相放电能够产生各种活性物质,其中羟基自由基(OH),氢自由基(H)被认为是引发液相化学反应的主要活性物种,但由于其活性强寿命短的特点,测量比较困难,由于缺少标准样品,定量测量更为困难。用光学方法测量自由基是一种直接测量方法,其特点是瞬时在线测量,能立即获得数据,进行时间和空间分布测量。为了研究微波水中放电产生的自由基特性,利用发射光谱诊断技术对微波水中放电产生的活性物质进行了在线检测,考察了微波功率、反应器内部压强对OH自由基相对光谱强度的影响,并观测了等离子体中OH自由基强度的空间分布;同时,估算了微波液相等离子体中的电子激发温度。实验结果表明,微波水中放电可以产生大量的OH,H,O自由基,其中OH自由基的相对光谱强度最强,并随微波功率的增加呈现明显上升的趋势,随反应器内部压强的增大而迅速减弱;以OH为主的自由基主要产生于电极尖端附近。微波液相等离子体的电子激发温度约为0.33×10~4 K。
[Abstract]:Liquid discharge can produce all kinds of active substances, among which hydroxyl radical (OH), hydrogen radical (H) is considered as the main active species that initiate liquid phase chemical reaction, but it is difficult to measure because of its short active life. Because of the lack of standard samples, quantitative measurement is more difficult. Measuring free radicals by optical method is a direct measurement method, which is characterized by instantaneous on-line measurement, which can obtain data immediately. In order to study the characteristics of free radicals produced by microwave water discharge, the active substances produced by microwave water discharge were on-line detected by emission spectrum diagnostic technique, and the microwave power was investigated. The influence of pressure inside the reactor on the relative spectral intensity of OH radical was studied, and the spatial distribution of OH radical intensity in plasma was observed, and the electron excitation temperature in microwave liquid plasma was estimated. The microwave water discharge can produce a large amount of OHH O free radical, among which the relative spectral intensity of OH radical is the strongest, and it increases obviously with the increase of microwave power, and weakens rapidly with the increase of the pressure inside the reactor. The hydroxyl radical is mainly produced near the tip of the electrode, and the electron excitation temperature of the microwave liquid plasma is about 0.33 脳 10 ~ (4) K.
【作者单位】：大连海事大学环境科学与工程学院;
【基金】：国家自然科学基金项目(11675031) 中央高校基本科研业务费专项资金项目(3132016327)资助
【分类号】：O657.3

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