脉冲放电等离子体协同二氧化钛降解偶氮类染料废水  

Degradation of Azo Dye Wastewater Using Pulsed Discharge Plasma with TiO_2

作　　者：孙明[1] 金宏力 杨颜颜 代存峰 郝夏桐[1] 鲁晓辉[1] 

机构地区：[1]上海海事大学静电研究所,上海200135

出　　处：《高电压技术》2015年第9期2862-2867,共6页High Voltage Engineering

基　　金：国家自然科学基金(51207089)~~

摘　　要：高压脉冲放电产生的等离子体可以有效降解废水中的有机物。以酸性橙Ⅱ为目标降解物,通过气液固三相脉冲放电来获取放电等离子体并与二氧化钛(Ti O2)光催化相结合,采用单喷嘴-筒式放电极结构,研究了不同脉冲峰值电压、脉冲重复频率、鼓气体积流量、Ti O2镀膜长度、放电处理时间等因素对酸性橙Ⅱ降解效果的影响。向反应器中加入介质玻璃球,在通入空气的情况下实现气液固三相脉冲放电,二氧化钛与放电产生的紫外光相结合有助于生成更多的活性物质羟基自由基(·OH)。研究结果表明:当脉冲峰值电压为-38 k V、脉冲重复频率为50Hz、鼓气体积流量为60 m L/min、Ti O2镀膜长度为1.0 cm、放电处理时间为120 min时酸性橙Ⅱ的降解率最高,达到43.09%;酸性橙Ⅱ的降解率随着脉冲峰值电压、鼓气体积流量的升高而先增大后减小;随着脉冲重复频率、放电处理时间的增加而升高;随着Ti O2镀膜长度的增加而先增加后基本不变。The organic compounds in the waste water could be degraded effectively by plasma produced by high-voltage pulsed discharge. We obtained plasma through three-phase （gaseous-liquid-solid） discharges with a nozzle-cylinder elec- trode, and used them and photo-catalysis TiO2 to conduct degradation experiments with acid orange 7 as the target. Effects of the peak voltage and repetition frequency of pulses, the ventilation gas volume flow rate, the length of the TiO2 film, and the discharge duration on the degradation were investigated. The three-phase discharge was realized by pumping air into waste water and insulation glass balls that were all filled in a reactor, to generate reactive species, mainly hydroxyl radical （.OH）, and this production was prompted with the assistance of TiO2 activated by ultraviolet light from the dis- charge. The results showed that the degradation rate of acid orange 7 reached a peak of 43.09% when the parameters were set to be pulse peak voltage of-38 kV, pulse repetition frequency of 50 Hz, ventilation gas flow rate of 60 mL/min, length of TiO2 of 1.0 cm and discharge duration of 120 min. With increasing peak voltage and gas flow rate, the degradation rate increased at first and then reduced, but it increased solely with increasing repetition frequency and discharge duration; meanwhile it could keep unchanged after increasing with increasing length of the TiO2 film.

关 键 词：放电等离子体 酸性橙Ⅱ 鼓气体积流量 脉冲放电 降解率 二氧化钛 

分 类 号：X791[环境科学与工程—环境工程]