研制出一种新型的悬浮态光电催化反应器,并以甲酸为研究对象,对该光电反应器进行了光电流增强和COD脱除的表征. 研究了光催化、电催化氧化及光电协同催化体系降解甲酸的电压-电流曲线. 数据表明,在相同的电压下,光电协同催化体系的电流远高于电化学氧化体系的电流与光催化体系中光电流之和. 同时,还研究了一系列物理化学因素如外加电压、光催化剂浓度和空气流量等对光电催化反应的影响. 实验结果表明,自行研制的新型悬浮态光电催化反应器具有良好的协同效应, 且所需光催化剂的最佳浓度远低于其他同类光电催化反应器的最佳浓度. 在该光电催化反应器中, 压缩空气可有效地增强传质效应和悬浮态中光激发的TiO2颗粒在电极表面的碰撞几率,从而使得外电场可有效地捕获光生电子.
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