氮气对电晕放电等离子体降解甲基蓝的影响  

Effects of Nitrogen on the Degradation of Methyl Blue by Corona Discharge Plasma

作　　者：李苗 董发勤[2] 霍婷婷[2,3] 周磊[2,3] 李刚[2,3] 周世平 王彬[2,3] 何平[1] LI Miao;DONG Fa-qin;HUO Ting-ting;ZHOU Lei;LI Gang;ZHOU Shi-ping;WANG Bin;HE Ping(School of Materials Science and Engineer,Southwest University of Science and Technology,Mianyang 621010,China;Key Laboratory of Solid Waste Treatment and Resource Recycle,Ministry of Education,Mianyang 621010,China;School of Environment and Resource,Southwest University of Science and Technology,Mianyang 621010,China;National Engineering Research Center for Municipal Wastewater Treatment and Reuse,Mianyang 621000,China)

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010 [2]固体废物处理与资源化教育部重点实验室,四川绵阳621010 [3]西南科技大学环境与资源学院,四川绵阳621010 [4]国家城市污水处理及资源化工程技术研究中心,四川绵阳621000

出　　处：《光谱学与光谱分析》2018年第11期3354-3361,共8页Spectroscopy and Spectral Analysis

基　　金：国家科技支撑计划项目(2014BAC13B05)资助

摘　　要：电晕放电等离子体技术是近年发展起来的一种新型高级氧化工艺,因其处理效果好、操作简单、占地面积小的特点在印染废水处理领域得到了广泛应用。目前因大部分有机污染物的降解机理不详,该技术尚处于探索阶段。因此,为了尽早将电晕放电等离子体技术应用于工业印染废水的处理,不同污染物降解机理的研究对该技术的工业化和产业化应用具有重要意义。至今,电晕放电等离子体技术对研究较多的染料的降解效果均较好,然而,是否适合所有染料的降解有待进一步研究。采用电晕放电等离子体技术处理三苯甲烷类染料甲基蓝,研究了溶液的初始浓度对甲基蓝紫外-可见光谱中芳香环的降解率、发色基团吸光度变化的影响,测定了溶液的浓度、总有机碳(TOC)、总氮(TN)、pH值等指标随着放电时间的变化,并对其相关性进行了分析。结合紫外-可见光谱(UV-Vis)、三维荧光光谱(3D-fluorescence)和傅里叶变换红外光谱(FTIR)三种光谱学手段分析了电晕放电降解甲基蓝过程溶液的颜色、荧光物质和官能团变化,分析了电晕放电降解甲基蓝30min后生成的中间产物。结果表明:电晕放电等离子体降解甲基蓝过程,溶液的浓度随着放电时间的延长逐渐减小,表明该技术对甲基蓝溶液有一定的降解能力;降解过程高压电极放电击穿含有大量氮气的空气产生N,NO·,N_2^+等含氮高活性粒子,这些粒子通过扩散作用迁移至液相,使得溶液中TN含量在整个降解过程逐渐升高;另有部分含氮高活性粒子与钨钢针电极溶出的C元素键合生成发色的C=N双键,使得溶液中的总有机碳在放电5min时有所升高。延长反应时间产生的高活性粒子与溶液中的有机物(甲基蓝及中间产物)继续作用,部分有机物矿化生成CO_2,引起溶液中TOC含量的下降。电晕放电相同时间内产生的活性粒子数量相当,增大甲基蓝浓度,未�The corona discharge plasma technology is a new type of advanced oxidation processes(AOPs)which has developed in recent years.Corona discharge plasma technology,which has characteristics such as high degradation efficiency,simple operation and less occupied area,has been widely used in the field of printing and dyeing wastewater treatment.At present,little is known about most of the organic pollutants degradation mechanism,hence this technology in the field of printing and dyeing wastewater treatment is still in the exploratory stage.Therefore,in order to apply the corona discharge plasma technology to the treatment of industry printing and dyeing wastewater as soon as possible,the exploration of different pollutants degradation mechanism is of great significance to the industrialization and industrial application of this technology.Up to now,corona discharge plasma technology has good degradation efficiency on the dyes which had been studied.However,the suitability of this technique for the degradation of all dyes remains to be further researched.In this paper,choosing methyl blue which is of triphenylmethane dye as a target contaminant,corona discharge plasma technology was used to degrade it.The impact of the initial concentration of methyl blue solution on the degradation rate of aromatic ring(314 nm)and the change of chromophore group(603 nm)absorbance in the ultraviolet visible spectra(UV-Vis)were investigated.The changes of the solution concentration,total organic carbon(TOC),total nitrogen(TN)and the pH values of the methyl blue solution were measured with the discharge time increased,and the correlation between them were analyzed.In this paper,three kinds of spectroscopy methods,based on ultraviolet visible spectra(UV-Vis),three dimensional fluorescence spectrum(3-D fluorescence)and Fourier transform infrared spectroscopy(FTIR),were used to analyze the changes of color,varieties of fluorescent substance and functional groups of methyl blue solution during the degradation process by corona discharge plasm

关 键 词：电晕放电等离子体 甲基蓝 含氮自由基 红外光谱 红外分峰 三维荧光光谱 

分 类 号：X661.1[环境科学与工程]