發(fā)布時(shí)間：2018-02-11 09:27

  本文關(guān)鍵詞： 微波液相等離子體 發(fā)射光譜 OH自由基　出處：《光譜學(xué)與光譜分析》2017年12期 　論文類型：期刊論文

【摘要】：液相放電能夠產(chǎn)生各種活性物質(zhì),其中羥基自由基(OH),氫自由基(H)被認(rèn)為是引發(fā)液相化學(xué)反應(yīng)的主要活性物種,但由于其活性強(qiáng)壽命短的特點(diǎn),測(cè)量比較困難,由于缺少標(biāo)準(zhǔn)樣品,定量測(cè)量更為困難。用光學(xué)方法測(cè)量自由基是一種直接測(cè)量方法,其特點(diǎn)是瞬時(shí)在線測(cè)量,能立即獲得數(shù)據(jù),進(jìn)行時(shí)間和空間分布測(cè)量。為了研究微波水中放電產(chǎn)生的自由基特性,利用發(fā)射光譜診斷技術(shù)對(duì)微波水中放電產(chǎn)生的活性物質(zhì)進(jìn)行了在線檢測(cè),考察了微波功率、反應(yīng)器內(nèi)部壓強(qiáng)對(duì)OH自由基相對(duì)光譜強(qiáng)度的影響,并觀測(cè)了等離子體中OH自由基強(qiáng)度的空間分布;同時(shí),估算了微波液相等離子體中的電子激發(fā)溫度。實(shí)驗(yàn)結(jié)果表明,微波水中放電可以產(chǎn)生大量的OH,H,O自由基,其中OH自由基的相對(duì)光譜強(qiáng)度最強(qiáng),并隨微波功率的增加呈現(xiàn)明顯上升的趨勢(shì),隨反應(yīng)器內(nèi)部壓強(qiáng)的增大而迅速減弱;以O(shè)H為主的自由基主要產(chǎn)生于電極尖端附近。微波液相等離子體的電子激發(fā)溫度約為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.
【作者單位】： 大連海事大學(xué)環(huán)境科學(xué)與工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(11675031) 中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金項(xiàng)目(3132016327)資助
【分類號(hào)】：O657.3

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