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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 ,直至被彻底降解
Cyclic voltammetry and UV spectroscopy were used to study the mechanism of photocatalytic degradation of organic compounds and on-line monitoring.The photocatalytic degradation of 4-chlorophenol with standard photocatalyst DegussaP2 5 under ultraviolet light showed that at least two pairs of redox The intermediate products were hydroquinone benzoquinone and hydroxyhydroquinone hydroxyquinone.The electrode reaction of 4-chlorophenol and intermediate could be used to observe the content change of them in the process of photocatalytic degradation so as to monitor the whole process on-line, And thus fully understand the photocatalytic reaction mechanism.From the UV spectra measured after different reaction time can be seen, the characteristic peaks of the benzene ring gradually disappear.This shows that 4-chlorophenol benzene ring gradually opened until it is completely degraded