光电协同催化氧化苯甲酸的试验研究

在自制的光电协同催化氧化反应器中,对苯甲酸溶液进行了光电协同催化氧化处理研究,考察了阳极偏电压、反应氛围和制备光阳极所用基材对苯甲酸降解效率的影响,并比较了光电协同催化氧化与光解、光催化氧化和电解处理对苯甲酸去除率的差异.试验结果表明,经过1h的处理,光电协同催化氧化对苯甲酸的去除率可达85%以上,远远高于光解、光催化氧化和电解处理对苯甲酸的去除率(依次为48%、30%和约0%),具有明显的光电协同作用;工作电极与对电极采用内外同心圆柱形的布置方式;在通入高纯氮的条件下,TiO₂/Ti板光阳极对苯甲酸的去除率在1h时可达98%,优于TiO₂/Al板光阳极在仆时对苯甲酸85%的去除率;在通入纯氧的条件下,TiO₂/Ti板光阳极和TiO₂/Al板光阳极经过1h对苯甲酸的去除率均接近100%.

Study of Photoelectrocatalytic Oxidation of Benzoic Acid

This study reports the photoelectrocatalytic oxidation of benzoic acid in a three-electrode photoelectroreactor. The effects of the anode bias potential, the atmosphere of reaction and the basis material for photocatalyst preparation on the removal efficiency of benzoic acid were researched. The photoelectrocatalysis was compared with photolysis, photocatalysis and electrolysis. The results of the experiments indicated the removal efficiency of benzoic acid after the photoelectrocatalytic oxidation process for 1h could be more than 85%, much higher than the efficiency of photolysis(48%), photocatalysis(30%) and electrolysis(nearly having no effect) . The synergetic effect of the photoelectricity was obvious. The working electrode and the counter electrode were arranged as two concentric columns whose diameters were different. The results showed that this kind of arrangement mode was very effective. In nitrogen atmosphere the removal efficiency of benzoic acid could be 98% when TiO₂/Ti acted as the anode of the photoelectrocatalytic oxidation process for 1h, much better than the TiO₂/Al did(85%). While in oxygen atmosphere the two kinds of electrodes were both effective and the removal efficiency of benzoic acid could approach 100%.