Electrochemical oxidation of reactive brilliant orange X-GN dye on boron-doped diamond anode

硼掺杂金刚石阳极电化学氧化活性橙X-GN偶氮染料废水（英文）

In this study,the electrochemical oxidation of reactive brilliant orange X-GN dye with a boron-doped diamond(BDD)anode was investigated.The BDD electrodes were deposited on the niobium(Nb)substrates by the hot filament chemical vapor deposition method.The effects of processing parameters,such as film thickness,current density,supporting electrolyte concentration,initial solution pH,solution temperature,and initial dye concentration,were evaluated following the variation in the degradation efficiency.The microstructure and the electrochemical property of BDD were characterized by scanning electron microscopy,Raman spectroscopy,and electrochemical workstation;and the degradation of X-GN was estimated using UV-Vis spectrophotometry.Further,the results indicated that the film thickness of BDD had a significant impact on the electrolysis of X-GN.After 3 h of treatment,100%color and 63.2%total organic carbon removal was achieved under optimized experimental conditions:current density of 100 mA/cm2,supporting electrolyte concentration of 0.05 mol/L,initial solution pH 3.08,and solution temperature of 60°C.

本文研究了硼掺杂金刚石阳极(BDD)对活性艳橙X-GN染料的电化学氧化的影响。BDD电极是采用采用热丝化学气相沉积法(HFCVD)在铌(Nb)衬底表面制备的。研究了工艺参数(如膜的厚度、电流密度、电解液浓度、溶液pH值、溶液温度、染料初始浓度)对降解效率的影响。采用扫描电镜(SEM)、拉曼光谱和电化学工作站表征了BDD的微观结构和电化学性能,采用紫外–可见分光光度计测量了X-GN降解性能。结果表明,BDD薄膜厚度对电化学降解X-GN有显著影响。在优化的实验条件下(电流密度为100 mA/cm^2、电解质浓度为0.05 mol/L、溶液初始pH值为3.08和溶液温度为60℃)处理废水3 h后可得到100%的色度移除率和63.2%的总有机碳量(TOC)去除率。