BDD电极对苯酚降解氧化的试验研究

Experimental study on degradation and oxidation of phenol by BDD electrode

基于掺硼金刚石(BDD)电极的电化学高级氧化技术是解决难降解有机污染物的有效方法之一。通过热丝化学气相沉积法(Hot Filament CVD,HFCVD)结合动态掺硼工艺,在WC-Co衬底上成功合成了BDD薄膜。在此基础上,利用已制备的WC-Co/BDD电极,以苯酚为目标污染物,探究了不同电流密度、电解质浓度、pH值、苯酚初始浓度对其降解效率的影响。试验结果显示,在电流密度为0.03 A/cm^(2),电解质为1.5 g/L Na_(2)SO_(4)的条件下,无论是在酸性还是碱性环境中,对于质量浓度为1000 mg/L的苯酚溶液,3 h内COD的去除率均达到95%;对于质量浓度低于500 mg/L的苯酚溶液,其COD去除率在相同时间内均接近100%。基于WC-Co/BDD电极的电化学高级氧化技术对苯酚的矿化效果极为显著。

Advanced electrochemical oxidation technology based on boron-doped diamond(BDD)electrode is an effective method to solve the problem of difficult degradation of organic pollutants.BDD films are successfully synthesized by hot filament COD(HFCVD)combined with dynamic boron doped process on WC-Co substrate.On this basis,using the prepared WC-Wo/BDD electrode,and taking phenol as the target pollutant,the effects of current density,electrolyte concentration,pH value and initial concentration of phenol on degradation efficiency were investigated.The experimental results showed that,under the condition that the current density was 0.03 A/cm^(2),1.5 g/L Na_(2)SO_(4)was used as electrolyte,the treatment of 1000 mg/L phenol solution could achieve a COD removal rate of nearly 95%within 3 hours whether in acidic or alkaline environment.For phenol solution with concentration less than 500 mg/L,the COD removal rate can be close to 100%in the same time.The electrochemical advanced oxidation technology based on WC-Co/BDD electrode has a remarkable effect on mineralization of phenol.