为探索TiO2光电催化氧化体系中·OH的产生规律并加速该技术的实用化,根据光激发TiO2体系的特点,借助阴离子交换膜,建立了采用邻二氮菲-Fe(Ⅱ)分光光度法测定TiO2/Ti光电催化体系中羟自由基累积浓度的方法,研究了体系pH值,外加偏压等对产生羟自由基累积浓度的影响.结果表明:pH值和外加偏压对TiO2/Ti光电催化体系中·OH的生成率具有重要影响,当溶液的初始pH值在TiO2等电点(pH为6.3)附近,外加偏压为O.6 V时,光激发TiO2所产生·OH的累积浓度达到最大;光激发后体系的pH值朝着靠近等电点的方向变化.
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