TiO_2光催化降解4氯苯酚过程中的电分析监测  

On-Line Monitoring in Photocatalytic Degradation of 4Chlorophenol by Using Cyclic Voltammetry and UV Vis Spectrometry

作　　者：贺飞[1] 沈伟韧[1] 赵文宽[1] 方程[1] 方佑龄[1] 

机构地区：[1]武汉大学化学系,武汉430072

出　　处：《催化学报》2001年第2期168-170,共3页

基　　金：国家自然科学基金!资助项目 ( 2 0 0 73 0 3 0 )

摘　　要：采用循环伏安法和紫外光谱法对有机物的光催化降解进行机理研究和在线监测 .以标准光催化剂DegussaP2 5在紫外光照射下催化降解 4 氯苯酚 ,发现在降解过程中至少有两对氧化还原中间产物 :对苯二酚 苯醌和羟基氢醌 羟基苯醌 .由 4 氯苯酚及中间产物的电极响应 ,可以观测到它们在光催化降解过程中的含量变化 ,从而对整个过程实现在线监测 ,并由此全面了解光催化反应机理 .从不同反应时间后测得的紫外光谱可以看到 ,苯环特征峰逐渐消失 .这表明 4 氯苯酚的苯环逐渐被打开 。On-line monitoring in photocatalytic degradation process of organic compound 4-chlorophenol (4-CP) was carried out by using cyclic voltammetry and UV-Vis spectrometry. The result showed that the degradation process undertook at least a two-route mechanism to the complete mineralization: through redox pairs of benzoquinone(BQ) and hydrobenzoquinone(HQ) and of hydroxybenzoquinone(HBQ) and hydroxyhydrobenzoquinone(HHQ). UV-Vis spectra taken at different time showed the breakage of benzene ring and the complete mineralization. The electroanalysis was proved to be a proper technique for on-line monitoring as it could detect simultaneously both initial reactants and intermediates, and thus it is suitable for on-line monitoring and complementary for mechanism study.

关 键 词：二氧化钛 循环伏安法 紫外-可见光谱 在线监测 反应机理 4-氯苯酚 有机污染物 

分 类 号：O643[理学—物理化学] O657.1[理学—化学]