本文選題：隔膜氣-液放電　切入點(diǎn)：降解　出處：《大連海事大學(xué)》2017年碩士論文

【摘要】：低溫等離子體水處理技術(shù)是集物理、化學(xué)、光學(xué)等于一體的新型高級氧化水處理技術(shù),可形成紫外光福射、高能電子轟擊、高氧化活性粒子等多因素協(xié)同作用,具有反應(yīng)速率快、氧化能力強(qiáng)、不產(chǎn)生二次污染等優(yōu)點(diǎn)。其中,氣液兩相放電等離子體技術(shù)相比較液相放電更加容易、穩(wěn)定,與純氣相放電相比較其傳質(zhì)速度快更加迅速,在處理水中難降解有機(jī)污染物方面具有明顯的優(yōu)勢。本研究采用自制的隔膜氣-液放電反應(yīng)器,研究其在不同放電載氣的隔膜放電特性,并應(yīng)用該反應(yīng)器在不同實(shí)驗(yàn)條件下以偶氮染料艷紅B和苯酚為研究對象進(jìn)行放電等離子體氧化降解研究,實(shí)驗(yàn)結(jié)論如下:(1)在隔膜氣-液放電過程中可產(chǎn)生.OH和O.強(qiáng)氧化性自由基,并且在氧氣為放電載氣時(shí)其相對光譜強(qiáng)度最強(qiáng);而在以空氣和氬氣為放電載氣時(shí),其發(fā)射峰分別以N_2譜帶和Ar Ⅰ譜帶為主;隨著放電時(shí)間的延長,不同載氣放電下液相中溶解的O_3和H_2O_2濃度都逐漸升高;當(dāng)氧氣為放電載氣時(shí),形成的O_3和H_2O_2濃度最高,在放電10 min后其濃度值分別達(dá)到11.42 mg/L和85.38 mg/L。(2)在輸入能量一定時(shí),艷紅B的降解率隨著隔膜氣-液放電孔數(shù)的增加而升高;在酸性強(qiáng),電導(dǎo)率小的實(shí)驗(yàn)條件下有利于艷紅B和苯酚的降解;在隔膜氣-液放電體系中氧氣為放電載氣時(shí)的去除效果最好,其次為氬氣和空氣;并且當(dāng)氧氣為放電載氣時(shí),去除苯酚的能量效率最高,可達(dá)到2.250 g/kWh。(3)羥基自由基清除劑的添加對艷紅B和苯酚的降解均具有抑制作用,表明·OH是放電反應(yīng)過程中降解有機(jī)污染物的重要活性粒子;Fe~(2+)的添加對艷紅B和苯酚的降解均具有催化作用,在本放電體系中Fe~(2+)的最佳投放濃度為0.4 mmol/L。(4)艷紅 B 的降解產(chǎn)物中有 Cl-、NO_3~-、NO_2~-、SO_4~(2-)、CH_3COOH、HCOOH、HOOCCOOH,表明艷紅B染料的偶氮鍵斷裂以及苯環(huán)和萘環(huán)結(jié)構(gòu)發(fā)生了開環(huán)并斷鏈的一系列氧化過程;苯酚的降解中間產(chǎn)物主要有四種:間苯二酚、對苯二酚、鄰苯二酚和對苯醌,其中間產(chǎn)物的濃度有先升高后降低的一個變化趨勢,并隨著放電時(shí)間的延長逐漸消失,最終的產(chǎn)物為二氧化碳和水。
[Abstract]:The low temperature plasma water treatment technology is a new advanced oxidation water treatment technology which integrates physics, chemistry and optics. It can form the cooperation of ultraviolet radiation, high energy electron bombardment, highly oxidized active particles and so on.It has the advantages of fast reaction rate, strong oxidation ability and no secondary pollution.The gas-liquid two-phase discharge plasma technology is easier and more stable than liquid-phase discharge, and its mass transfer rate is faster and faster than that of pure gas-phase discharge, and it has obvious advantages in the treatment of refractory organic pollutants in water.In this study, a self-made membrane gas-liquid discharge reactor was used to study the characteristics of membrane discharge in different discharge carrier gases.The oxidation degradation of azo dye brilliant red B and phenol by discharge plasma was studied in this reactor under different experimental conditions. The experimental results are as follows: 1) during the membrane gas-liquid discharge, .OH and O can be produced.The relative spectral intensity of strongly oxidized free radicals is the strongest when oxygen is the discharge carrier gas, while the emission peaks are mainly N2 and ar I bands when air and argon are the discharge carrier gas, respectively, with the prolongation of discharge time,The degradation rate of brilliant red B increased with the increase of gas-liquid discharge pore number, and was favorable to the degradation of brilliant red B and phenol under the conditions of strong acidity and low conductivity.In the membrane gas-liquid discharge system, the removal efficiency of phenol is the highest when oxygen is the discharge carrier gas, followed by argon and air, and when oxygen is the discharge carrier gas, the removal efficiency of phenol is the highest.The addition of hydroxyl radical scavenger can inhibit the degradation of red B and phenol.The results showed that the addition of OH, an important active particle for degradation of organic pollutants during discharge reaction, could catalyze the degradation of both brilliant red B and phenol.鍦ㄦ湰鏀劇數(shù)浣撶郴涓璅e~(2 )鐨勬渶浣蟲姇鏀炬祿搴︿負(fù)0.4 mmol/L.(4)鑹崇孩 B 鐨勯檷瑙ｄ駭鐗╀腑鏈，

本文編號：1706697