脉冲放电等离子体-流光光催化协同作用的动力学分析  

Kinetic Analysis of the Synergistic Effect in the Pulsed Discharge Plasma System Coupled with Photocatalysis

作　　者：王慧娟[1] 李杰[2] 储金宇[1] 肖思思[1] 

机构地区：[1]江苏大学环境学院,镇江212013 [2]大连理工大学静电与特种电源研究所,大连116024

出　　处：《高电压技术》2010年第7期1792-1796,共5页High Voltage Engineering

基　　金：国家自然科学基金(20377006);江苏大学高级专业人才科研启动基金(08JDG041)~~

摘　　要：高级氧化技术的联用可以提高水体中有机物的矿化效率,为此,基于脉冲放电过程中产生的紫外光效应,研究将玻璃珠负载的TiO2膜催化剂放置于一多针-板电极形式的脉冲放电等离子体体系中,建立脉冲放电等离子体-流光光催化协同体系,分析其协同作用机理。研究考察了不同载气、溶液初始pH值和添加不同浓度自由基捕收剂(碳酸钠)等实验条件下,单独脉冲放电等离子体体系和脉冲放电等离子体-流光光催化协同体系中苯酚氧化的准一级动力学常数。结果表明,在各实验条件下,脉冲放电流光均能诱导TiO2的光催化活性;氧气(O2)作为载气和酸性溶液条件有利于提高协同体系中苯酚的降解速率;在单独脉冲放电体系和脉冲放电等离子体-流光光催化协同体系中,对有机物降解起主要作用的是羟基自由基(.OH)。Mineralization efficiency of organic compounds in water can be enhanced by combining different advanced oxidation processes （AOPs）. As ultraviolet light can be produced during a pulsed discharge process,a synergistic system of pulsed discharge plasma-streamer photocatalysis （a multi-needle-plate electrode pulsed discharge system coupled with supported TiO2 film photocatalyst on glasses beads） was set up. The mechanism of synergistic effect was reviewed by recording a pseudo-first-order kinetic constant of phenol oxidation under the conditions of different gas bubbling varieties,initial solution pH values and hydroxyl radical scavengers addition （Na2CO3） with different concentration. The obtained results show that the steamer produced during the pulsed discharge process could induce the photocatalytic activity of the supported TiO2 photocatalyst under different experimental conditions. O2 and acidic liquid condition are conducive to phenol oxidation. Hydroxyl radical （·OH） is the pivotal species for phenol degradation in the plasma alone system as well as the pulsed discharge plasma-streamer photocatalysis.

关 键 词：脉冲放电 等离子体 流光 TIO2光催化 协同作用 动力学分析 

分 类 号：X703.1[环境科学与工程—环境工程]