TiO2修饰BDD复合电极材料的制备及性能

Preparation and Properties of TiO2 Modified BDD Composite Electrode

采用水热法在掺硼金刚石（Boron-doped diamond,BDD）薄膜衬底上修饰纳米棒状TiO2,制备出具有p–n异质结结构的复合层状薄膜材料,通过环氧树脂封装制备成电极。利用扫描电子显微镜、X射线衍射分别对其形貌和物相进行表征,并在不同条件下对活性艳红X-3B模拟染料废水进行了降解。结果表明：TiO2纳米棒团聚而成的纳米束排列均匀、致密,与BDD薄膜结合紧密,TiO2为金红石相。由于二者光电协同效应,与TiO2单独光催化、BDD电极单独电化学氧化比较,采用该复合电极对活性艳红X-3B模拟染料废水的降解效率得到进一步提升。

Boron-doped diamond （BDD） film substrate was modifed with TiO2 nanorod by a hydrothermal method. TiO2/BDD composite was further encapsulated in epoxy resin to prepare the electrode. The morphology and phase of TiO2/BDD composite materials were characterized by scanning electron microscopy and X-ray diffraction. A reactive brilliant red X-3B dye wastewater was degraded by TiO2/BDD composite electrode under different conditions. The results show that the morphology of TiO2 is nanobeam due to the aggregation of nanorods. The nanorods of TiO2 are uniform and dense in rutile phase, which are closed to the BDD film. Compared to the photo-catalysis of TiO2 and electrochemical oxidation of BDD electrode, the photoelectric catalysis of the composite electrode can further enhance the degradation rate of reactive brilliant red X-3B.