液相脉冲高压放电催化降解二甲基亚砜的研究  

Catalytic Degradation of Dimethyl Sulfoxide in Aqueous Solutions by Liquid-Phase Pulsed High Voltage Discharge

作　　者：陆彬[1] 季民[1] 卢逸人[1] 

机构地区：[1]天津大学环境科学与工程学院,天津300072

出　　处：《环境科学》2010年第2期373-378,共6页Environmental Science

基　　金：国家"985"工程天津大学引进杰出人才基金项目(W20401)

摘　　要：研究了液相脉冲高压放电Fenton催化对二甲基亚砜（dimethyl sulfoxide，DMSO）的降解．自制了脉冲上升前沿400ns、放电重复率96．2Hz、峰值电压20kV的脉冲高压系统，它驱动液相高压放电发生．对脉冲高压电极侧壁做了绝缘以考察新型电极对单脉冲功率的影响．溶液电导率对液相高压放电H2O2产率和DMSO降解的影响及Fe（Ⅱ）和O2流量对液相高压放电DMSO降解的影响进行了考察，对液相高压放电Fenton催化降解DMSO的产物浓度、产物选择性随高压放电时间的变化也进行了研究．结果表明，新型电极的单脉冲功率随电导率增加有一极限值；溶液电导率和O2流量对DMSO降解起阻碍作用；Fe（Ⅱ）对DMSO降解起Fenton催化作用；液相高压放电Fenton催化降解DMSO的降解率在高压放电45min时为80％，可生化性至少提高32％～48％，最大能量效率按G37＊计为0．0087mol／（kW·h）．并对DMSO降解机制做了探讨．本研究显示了液相等离子体联用催化剂处理有机污染物的良好效果．Fenton catalytic degradation of dimethyl sulfoxide （DMSO） by using liquid-phase pulsed high voltage discharge was carried out. The discharge was driven by a self-made pulsed power supply providing a pulse rising time of 400 ns, discharge repetition rate of 96.2 Hz, peak voltage of 20 kV. The side surface of discharge electrode was insulated in order to limit the discharge current, followed by estimating its effect on single pulse power. The effects of aqueous conductivity, Fe（ Ⅱ ） , and O2 flow rate on liquid-phase discharge induced DMSO degradation and aqueous conductivity on corresponding H2O2 yield were investigated. The concentrations and selectivities of intermediates of DMSO degradation, were also studied. The results indicated that when using the insulated electrode, single pulse power had a limiting value with increasing the aqueous conductivity; DMSO degradation rate was reduced with increasing the aqueous conductivity and O2 flow rate,whereas Fe（ Ⅱ ） showed a Fenton catalytic oxidation of DMSO;80% of DMSO degradation rate was achieved at the pulsed high vohage discharge time of 45 min and the resultant biodegradability was enhanced by at least 32%- 48% ;the maximum energy efficiency in G37＊ was 0. 008 7 mol/（ kW · h）. The study suggested that the liquid-phase plasma combined catalyst promised the potential of organic compound degradation.

关 键 词：液相脉冲高压放电 FENTON 二甲基亚砜 DMSO 催化 

分 类 号：X703.1[环境科学与工程—环境工程]