超声辅助电催化氧化降解苯酚的研究  

Study on ultrasound-assisted electro-catalytic oxidation of phenol in water

作　　者：马前[1] 梅滨[2] 庄琳懿[1] 倪亚明[1] 

机构地区：[1]同济大学生命科学与技术学院污染控制与资源化研究国家重点实验室,上海200092 [2]上海理工大学理学院,上海200093

出　　处：《环境污染治理技术与设备》2006年第10期51-54,共4页Techniques and Equipment for Environmental Pollution Control

基　　金：高等学校博士学科点专项科研基金(20010247004)

摘　　要：对电催化氧化和超声辅助电催化氧化降解苯酚过程中的UV扫描吸收光谱研究表明:在苯酚的氧化降解反应过程中,都有对紫外光有吸收的中间体生成;对吸光度峰值随降解反应时间的变化关系进行非线性最小二乘法拟合(NLSF),发现溶液的相对吸光度峰值的衰减均符合表观零级反应动力学规律,其相应的表观反应速率常数(k0)分别为(0.0051±0.0005)m in-1和(0.0052±0.0003)m in-1;但超声波对电催化降解苯酚的速度和效果并无显著影响。同时GC-MS也检测到苯酚超声辅助电催化氧化降解60 m in后,发现除苯酚仍然存在外,还有中间产物苯酚乙酸酯、甲酸、乙酸,从而证实苯酚在羟基自由基作用下,开环氧化降解生成乙酸和甲酸等小分子有机物,最后降解为二氧化碳和水。This paper discussed the electro-catalytic oxidation and ultrasound-assisted electro-catalytic oxidation which were used respectively to the degradation of phenol. Through the UV scanning spectra it can be proved some intermediates that can absorb the UV light were produced in the degradation reaction. The absorbance peak varied with reaction time and the relationship was processed by NLSF. The results showed that the reductions of relative absorbance peak of the solutions treated by the two ways were both the apparent zero-order reaction, and the apparent reaction constants （ k0 ） were （0.0051±0. 0005 ） min^-1 and （0. 0052 ±. 0003 ） min^-1, respectively. Besides phenol, the intermediate formic acid, acetic acid and phenolic acetate were detected by GC-MS in the reaction system after 60min of the degradation of phenol. It showed that the phenyl group of phenol was cleaved by action of HO2 , and degraded into formic acid, acetic acid and other small molecular weight organics, finally degraded into CO2 and H2O.

关 键 词：电催化氧化 超声 苯酚 中间体 机理 

分 类 号：X703.1[环境科学与工程—环境工程]