以泡沫镍为基材,采用溶胶-凝胶法制备了TiO2纳米膜光催化剂.在自制外加电场光催化反应装置中,对催化剂施加一定的偏电压,研究了甲基橙溶液的光电催化降解反应,考察了偏压极性、阳极偏压和甲基橙初始溶液浓度等对降解效率的影响,并比较了光电催化与光催化、光解对甲基橙溶液降解的差异.结果表明,外加阳极偏压形成的电场可以较大幅度提高甲基橙溶液的降解效率.从半导体和量子力学理论出发探讨了电场促进光催化反应的作用机理.
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