摘要
以Ti为阳极研究了微弧放电对污水的处理效果，发现放电条件下对甲基橙的脱色效果显著．在H3PO4电解液（0．3mol／L）中，峰值电压为550V、脉冲频率为300Hz、占空比为1／180、阳极电极面积为25mm×50mm条件下，60min内甲基橙溶液（600ml，20mg／L）的脱色率可达94％．XRD结果显示，放电中Ti阳极上形成的陶瓷层为锐钛矿型TiO2．光谱结果表明，电极表面微弧的波长为300～350nm．这说明该放电体系中存在光催化、电催化和类似超声的冲击波催化的反应条件．以Ti阳极陶瓷层为催化剂进行的对照实验表明，单独进行光催化、电催化和声催化反应对甲基橙溶液的脱色效果不明显．通过机理分析认为，Ti阳极上的微弧放电是以等离子体催化为主要作用方式，并在放电环境中形成多能场的协同作用，实现对有机物降解．
The effect of micro-arc discharge of the Ti anode on the decolorization of methyl orange was studied. It was found that the decolorization of methyl orange was prominent. Under the conditions of peak-value voltage 550 V, pulse frequency 300 Hz, duty circle of positive pulse 1/180, anode area 25 mm - 50 mm, and reaction time 60 min in H3PO4 electrolyte （0.3 mol/L）, the decolorization of methyl orange （600 ml, 20mg/L） was 94 %. During the discharge, the ceramic layer formed on the Ti anode was anatase and the wavelength of micro- arc was between 300 and 350 nm, which were proved by XRD and spectrum analysis. It was hinted that there might be photocatalysis, electrocatalysis, wave-like sono-catalysis during micro-arc discharge. The contrastable experiments showed that the individual effect of such catalysis was inapparent. The reaction mechanism was thought that the dominating process was plasma catalysis with the harmonious effects of multiple energy fields on the Ti anode during micro-arc discharge in the degradation of organic compounds.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2007年第1期45-50,共6页
基金
辽宁省自然科学(博士启动)基金(20031057)
关键词
微弧放电
二氧化钛
等离子体催化
多能场
协同催化
甲基橙
脱色
micro-arc discharge
titania
plasma catalysis
multiple energy field
harmonious catalysis
methyl orange
decolorization
