羅丹明B的性能
(廊坊師范學院 化學與材料科學學院，廊坊 065000)
摘 要: 以恒電流復合電沉積方法制備(Ni-Mo)-TiO2薄膜。采用SEM、XRD和DRS對薄膜的表面形貌、相結(jié)構和光譜特性進行表征，以羅丹明B為模擬污染物對薄膜的光催化活性進行測定，討論羅丹明B溶液的pH值、通入氣體以及不同輻射光波對薄膜光催化性能的影響，并推測光催化機理。結(jié)果表明：(Ni-Mo)-TiO2薄膜是由TiO2納米粒子相和納米晶Ni-Mo固溶體相構成的復合薄膜。薄膜具有較高的光催化活性，在可見光和紫外光照射下，羅丹明B的降解率分別為多孔P25 TiO2粒子薄膜的2.0倍和1.7倍。復合薄膜光催化活性的提高主要源于在薄膜層中能有效形成(Ni-Mo)/TiO2異質(zhì)結(jié)和良好的電子通道，它一方面可以促使光生電荷的分離，另一方面加速了氧氣與激發(fā)電子的還原反應。
關鍵字: (Ni-Mo)-TiO2納米膜；復合電沉積；光催化；羅丹明B
their photocatalytic activity of Rhodamine B
（Faculty of Chemistry and Material Science, Langfang Teachers College, Langfang 065000, China）
Abstract:The (Ni-Mo)-TiO2 thin film was prepared by electrolytic co-deposition of Ni-Mo ally and TiO2 particles from a solution in which TiO2 nano particles (P25) were suspended by stirring. The surface morphology, phase structure and optical characteristics of the thin film were analyzed by scanning electron microscopy (SEM), X-ray diffractometry (XRD) and diffuse reflectance ultraviolet-visible spectroscopy (DRS), respectively. The photocatalytic properties were evaluated with Rhodamine B as a model compound. The effects of pH of the Rhodamine B aqueous solution, gaes bubbling through the solution, UV and visible light irradiation on the photocatalytic activity of (Ni-Mo)-TiO2 thin film were investigated. And the photocatalytic reaction mechanism was presumed. The results show that the (Ni-Mo)-TiO2 thin film consists of TiO2 crystalline particles in the size of 50−100nm and Ni-Mo nano crystalline in solid solution. The (Ni-Mo)-TiO2 film is photocatalytically more active than that of TiO2/ITO. Under visible and UV light irradiation, the photocatalytic degradation rate of (Ni-Mo)-TiO2 film is 2.0 times and 1.7 times as much as that of the TiO2/ITO thin film, respectively. The increasing photocatalytic activity is mainly due to the heterojunction of (Ni-Mo)/TiO2 and good electronic passage-way in the film, both of which can efficiently promote the separation of charges and accelerate the reaction of excited electrons with oxygen relatively to TiO2/ITO film in photocatalytic degradation for Rhodamine B.
Key words: (Ni-Mo)-TiO2 nanofilm; composite electroplating; photocatalysis; Rhodamine B
