水降膜DBD等离子体去除水中磺胺甲恶唑的效能及机理  

Removal Efficiency and Mechanism of Sulfamethoxazole by Water Falling Film DBD Plasma

作　　者：商克峰[1] 王永鑫 鲁娜[1] 姜楠[1] 李杰[1] 吴彦[1] SHANG Kefeng;WANG Yongxin;LU Na;JIANG Nan;LI Jie;WU Yan(School of Electrical Engineering,Dalian University of Technology,Dalian 116024,China;School of Environment,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学电气工程学院,大连116024 [2]大连理工大学环境学院,大连116024

出　　处：《高电压技术》2023年第11期4859-4867,共9页High Voltage Engineering

基　　金：国家自然科学基金(21977024,21577011)。

摘　　要：水降膜介质阻挡放电装置可以在气相高效生成反应活性物质,且大的气–液反应界面有利于反应活性物质的气–液传质,高效降解液相污染物。为此研究了单极性和双极性脉冲电源供电时水降膜装置的放电特性及磺胺甲恶唑(sulfamethoxazole,SMX)的降解效率,研究发现双极性脉冲供电时,水降膜装置放电强度及SMX降解率更高。同时,本文探究了双极性脉冲电压和频率、SMX初始质量浓度、pH值、液体流速和电导率对SMX降解的影响,分析了SMX的降解机理。结果表明:放电功率随放电电压和脉冲频率升高而增大,SMX降解率随之升高,当放电电压较低(24 kV)时,电压升高能提高SMX降解的能量效率,但提升放电频率会导致SMX降解能量效率的下降;液体循环流量和电导率对SMX的降解影响不大;放电功率为5 W,放电处理质量浓度为20 mg/L的200 mL溶液30 min,SMX降解率达到了80.2%,能量效率达到1.28 g/(kW·h);由于过臭氧化和SMX分子的质子化效应,碱性条件下SMX的降解率远高于酸性条件下的降解率。The water falling film dielectric barrier discharge(DBD)reactor can efficiently generate gaseous reactive species,and its large gas-liquid reaction interface is conducive to the mass transfer of gaseous reactive species into solution for an efficient degradation of aqueous pollutants.We studied the effect of pulse polarity on the discharge characteristics and the degradation of sulfamethoxazole(SMX)in a water falling film pulsed DBD reactor.It is found that the electric discharge was stronger and the SMX degradation efficiency was higher when water falling film reactor was powered by a bipolar pulse power supply,compared to unipolar pulse generators.Moreover,the effects of bipolar pulse voltage and frequency,initial concentration of SMX and pH value on the degradation of SMX were investigated,and the degradation mechanism of SMX was also analyzed.The results show that the discharge power and the degradation efficiency of SMX will increase with the discharge voltage and pulse frequency.When the discharge voltage is low,an increase in applied voltage will result in higher SMX degradation efficiency and energy efficiency,but an elevating pulse frequency usually decreases the energy efficiency.Solution recycling flow rate and conductivity have a negligible effect on the degradation of SMX.At a discharge power of 5 W,the degradation efficiency of SMX reaches 80.2%after 200 mL 20 mg/L SMX solution is treated for 30 minutes,at this time the energy efficiency is 1.28 g/(kW·h).Due to the ozonation and protonation of SMX molecules,the degradation efficiency of SMX at alkaline pH values is much higher compared to acidic conditions.

关 键 词：双极性脉冲放电 DBD等离子体 磺胺甲恶唑 活性氧物质 降解率 

分 类 号：X703[环境科学与工程—环境工程]