【摘要】 为了得到光电化学性能稳定、光催化活性好、制备方法简便的TiO2光电极, 采用涂覆法制备了纳米TiO2薄膜光电极。XRD,SEM 结果表明电极上涂覆的TiO2的晶型为锐钛型,纳米TiO2在电极表面分布均匀,薄膜厚度在10 μm左右,且电极表面有一定的粗糙度。交流阻抗图谱分析显示TiO2 电极在光照下能进行光电化学反应。应用于20 mg/L苯酚溶液的降解中,结果表明,该电极光电催化降解性能优于光催化降解性能,电场在降解过程中发挥了作用;对照态光氧化过程基本无化学反应发生;暗态下电极上也无吸附现象;反应后电极无剥落损伤。更多还原

【Abstract】 In order to obtain a simply prepared titanium dioxide electrode with stable photoelectrochemical properties and good photocatalytic activities, a nano-TiO2 thin film photoelectrode was prepared by coating technique. The XRD and SEM results of this photoelectrode indicated that: the crystalline of TiO2 was anatase; nano-TiO2 was well-distributed on the electrode surface; the thickness of TiO2 thin film was about 10 μm after three time coating; electrode surface was rough. The results of AC impedance spectrogram indicate that TiO2 electrode can be used as photoelectrode in the photoelectrocatalytic reaction system. The activity of this thin film electrode was examined in the degradation of 20 mg/L phenol solution. The photocatalytic removal rate of phenol was enhanced in the presence of added bias and the electrical bias played an important role during the degradation process. 365 nm light can not destroy the phenol molecule. There was no adsorption between electrode and phenol. TiO2 thin film was in good state and did not peel off during and after reaction.更多还原