硼掺杂金刚石薄膜电极降解青霉素G钠废水机制  

Degradation mechanism of penicillin G sodium wastewater at boron-doped diamond electrodes

作　　者：曲有鹏[1,2] 吕江维[3] 冯玉杰[1] 张杰[1] QU Youpeng;LU Jiangwei;FENG Yujie;ZHANG Jie(State Key Laboratory of Urban Water Resource and Environment(Harbin Institute of Technology),Harbin 150090,China;School of Life Science and Technology,Harbin Institute of Technology,Harbin 150080,China;School of Pharmacy,Harbin University of Commerce,Harbin 150076,China)

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

出　　处：《哈尔滨工业大学学报》2020年第6期119-125,共7页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金(51308171);中国博士后科学基金(2016M591534);黑龙江省政府博士后资助项目(LBH-Z16088)。

摘　　要：针对抗生素废水中青霉素类物质难于生化降解的问题,采用直流等离子体化学气相沉积方法制备硼掺杂金刚石(boron-doped diamond, BDD)薄膜电极,以典型的青霉素G钠为目标污染物,对BDD电极降解青霉素的规律及降解历程进行研究.结果表明,不同质量浓度的青霉素G钠在电极上均能够被完全降解,发生电化学燃烧.青霉素G钠和化学需氧量(chemical oxygen demand, COD)的降解符合一级反应动力学,电流密度从10 mA/cm^2提高到20 mA/cm^2时,青霉素G钠和COD的反应速率常数分别增加了51.3%和29.1%.BDD电极上青霉素G钠的降解主要受液相传质过程控制,电流效率(current efficiency,EC)与青霉素G钠的质量浓度和电流密度有关.得到了青霉素G钠在BDD电极上的降解历程,主要的中间产物有青霉酸、异构青霉酸、青霉烯酸和青霉噻唑酸.To deal with the bio-refractory substances of penicillin in antibiotic wastewater, boron-doped diamond(BDD) electrodes prepared by direct current plasma chemical vapor deposition system were used to investigate the degradation rule and pathway of penicillin wastewater with penicillin G sodium as target pollutant. Results show that penicillin G sodium with different concentrations could be completely degraded at BDD electrodes by electrochemical combustion reaction. The degradation of penicillin G sodium and chemical oxygen demand(COD) accorded with the pseudo-first-order rate kinetics. When the current density was increased from 10 mA/cm^2 to 20 mA/cm^2, the apparent reaction rate constant of penicillin G sodium and COD increased by 51.3% and 29.1%, respectively. The degradation of penicillin G sodium at BDD electrodes was controlled by mass transfer in liquid phase. The concentration of penicillin G sodium and current density greatly influenced the current efficient(EC). Major intermediate products of the degradation pathway of penicillin G sodium at BDD electrodes were penillic acid, isopenillic acid, penicillenic acid, and penicilloic acid.

关 键 词：硼掺杂金刚石 电催化电极 电化学降解 抗生素废水 青霉素 

分 类 号：X703.1[环境科学与工程—环境工程]