摘要
采用热丝化学气相沉积法制备掺硼金刚石薄膜(BDD)电极,以过硫酸盐(PS)作为支撑电解质构建BDD-PS体系,电化学降解蒽醌类活性蓝19(RB-19)模拟染料废水。研究了BDD-PS体系中电流密度、染料初始浓度、pH值、温度等工艺参数对RB-19降解效率的影响。结果表明,BDD-PS体系结合了羟基自由基(·OH)和硫酸根自由基(·SO4^-)氧化有机物,更有利于有机物的降解;电解质浓度0.05 mol/L时,BDD-PS体系降解RB-19的最优参数为:电流密度10 mA/cm^2,染料初始浓度100 mg/L,初始pH值1.5,溶液温度50℃。在此条件下电化学降解120 min后,色度移除率达到100%,能耗为2.2 kWh/m^3,TOC移除率达到64%。表明BDD-PS体系在降解有机污染物方面具有应用潜力。
A boron-doped diamond film(BDD)electrode was prepared by using hot filament chemical vapor deposition.A BDD-PS system with persulfate(PS)as an electrolyte was constructed to electrochemically degrade the simulated dye wastewater of anthraquinone-based Reactive Blue 19(RB-19).The effects of process parameters,such as current density,initial dye concentration,pH value and temperature,on the degradation efficiency of RB-19 in BDD-PS system were studied.The results show that the organic matter is oxidized by BDD-PS system together with hydroxyl radical(·OH)and sulfate radical(·SO4^-),which is more conducive to the degradation of organic matter.With the electrolyte concentration at 0.05 mol/L,the optimal parameters for the degradation of RB-19 by BDD-PS system are determined as follows:current density of 10 mA/cm^2,initial dye concentration of 100 mg/L,initial pH of 1.5,and solution temperature at 50℃.A 120-min electrochemical degradation with the above-mentioned optimal conditions can result in the chroma removal rate up to 100%,with the energy consumption of 2.2 kWh/m^3 and the TOC removal rate reaching 64%.It is shown that BDD-PS system can be potentially applied in the degradation of organic pollutants.
作者
李伟
苗冬田
魏秋平
马莉
周科朝
LI Wei;MIAO Dong-tian;WEI Qiu-ping;MA Li;ZHOU Ke-chao(School of Materials Science and Engineering,Central South University,Changsha 410083,Hunan,China;State Key Laboratory of Powder Metallurgy,Changsha 410083,Hunan,China)
出处
《矿冶工程》
CAS
CSCD
北大核心
2020年第2期119-122,共4页
Mining and Metallurgical Engineering
基金
国家重点研究开发计划(2016YFB0301400)
国家自然科学基金(51601226,51874370)
湖南省自然科学基金(2019JJ40375,2019JJ50796)。
关键词
废水处理
电化学氧化
掺硼金刚石薄膜电极
过硫酸盐
RB-19
有机废水
wastewater treatment
electrochemical oxidation
boron-doped diamond film electrode
persulfate
RB-19
organic wastewater
