硼掺杂金刚石薄膜电极电催化降解双酚A  

Electrochemical degradation of bisphenol A at boron-doped diamond electrodes

作　　者：吕江维[1,2] 冯玉杰[1] 曲有鹏[1,3] 刘峻峰[1] 崔福义[1] 

机构地区：[1]哈尔滨工业大学城市水资源与水环境国家重点实验室,哈尔滨150090 [2]哈尔滨商业大学药学院,哈尔滨150076 [3]哈尔滨工业大学生命科学与技术学院,哈尔滨150080

出　　处：《哈尔滨工业大学学报》2013年第12期32-37,共6页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金资助项目(51308171和51209061);中国博士后科学基金资助项目(2011M500671)

摘　　要：针对水环境中环境激素双酚A(bisphenol A,BPA)的污染,采用直流等离子体化学气相沉积方法制备了硼掺杂金刚石(boron-doped diamond,BDD)薄膜电极,利用高效液相色谱法和液相色谱质谱联用的方法,对BPA在BDD电极上的降解规律及降解历程进行研究.结果表明:不同初始质量浓度的BPA在电极上均能被完全降解,降解规律符合准一级反应动力学,初始质量浓度100和10 mg·L-1时的表观反应速率常数分别为0.494和0.700 h-1;电流密度从10 mA·cm-2提高到40 mA·cm-2时,表观反应速率常数增大50.61%,去除率提高11.26%.BPA的降解过程检测到7种中间产物,降解主要分为两个途径:一是BPA的一侧苯环先开环降解,最后完全矿化;二是BPA的两个苯环同时开环,然后逐级降解直至矿化.To solve the pollution of bisphenol A （BPA） which was considered as an environmental endocrine, boron-doped diamond （BDD） electrodes were prepared by direct current plasma chemical vapor deposition （DC- PCVD） system. Mechanisms and reaction pathways of electrochemical degradation of bisphenol A （BPA） at BDD electrode was investigated by high performance liquid chromatography （HPLC） and liquid chromatography-mass spectrometer （LC-MS）. The results showed that BPA with different initial concentrations were completely mineralized to CO2 at BDD electrode, following the pseudo-first-order rate kinetics. The apparent reaction rate constant for BPA with initial concentrations of 100 and 10 mg · L-1 were 0. 494 and 0. 700 h-1, respectively. When the current density was increased from 10 to 40 mA · cm-2, the apparent reaction rate constant and the removal rate were increased by 50. 61% and 11.26%, respectively. Seven intermediate products were detected in the degradation process, and two different degradation pathways were discovered. One pathway was that BPA was decomposed readily into one-ring aromatic compounds first and eventually mineralized by electrolysis to CO2, another was that both of the aromatic rings in BPA molecular structure underwent ring breakage simultaneously and then continuously oxidized to CO2 till the end of the reaction.

关 键 词：硼掺杂金刚石 电催化 电极 双酚A 电化学降解 

分 类 号：X703.1[环境科学与工程—环境工程]