摘要
以石墨棒为阳极,采用电化学氧化法降解水溶液中甲基橙。通过紫外可见光谱和HPLC分析初步鉴定了甲基橙降解过程中的部分中间产物;通过硝酸银滴定法证明了使用的支持电解质氯化钠能参与并促进氮氮双键和苯环的破坏;通过紫外可见光谱、COD的变化考察了电解质的种类及浓度、电极种类、修饰及形状、槽电压和酸碱度等参数对石墨棒阳极降解甲基橙能力的影响。实验结果表明,以石墨棒为阳极、以石墨棒或者铜环为阴极组成的二维电极体系,和以石墨棒为阳极、以铜环为阴极并填充活性炭组成的三维电极体系,在氯化钠水溶液中均能有效降解甲基橙,20 min后脱色率超过95%,3 h后COD去除率超过90%。
With graphite rod as anode,the electrochemical oxidation was used to degrade methyl orange(MO) in aqueous solution. Some degraded intermediate products were preliminarily identified through UV-Vis spectra and HPLC chromatograms. The supporting electrolyte sodium chloride was proved to participate in and promote the destruction of N = N double bond and benzene ring by silver nitrate titration analysis. By the changes of UV-Vis spectra and COD of the degraded solution,the effects of electrolyte kind,electrolyte concentration,electrode kind,electrode modification,electrode shape,cell voltage and p H value on MO degradation by the graphite rod anode were investigated. The experimental result showed that the two-dimensional electrode system composed of the graphite rod as anode and the graphite rod or the copper ring as cathode,and the three-dimensional electrode system composed of the graphite rod as anode,the copper ring as cathode and the activated carbon as padding,could degrade MO in aqueous solution containing sodium chloride,the decoloring rates were more than 95% after 20 min degradation and the COD removal rates were more than 90% after 3 h degradation.
出处
《环境工程学报》
CAS
CSCD
北大核心
2015年第5期2324-2330,共7页
Chinese Journal of Environmental Engineering
关键词
石墨棒电极
甲基橙
电化学氧化
降解
graphite rod
methyl orange
electrochemical oxidation
degradation
