State Key Laboratory of Urban Water Resources and Environment, Department of Environmental Science and Engineering Harbin Institute of Technology, Huanghe Road 73, Nangang District, Harbin 150090, China.
J Hazard Mater. 2011 Sep 15;192(3):1812-8. doi: 10.1016/j.jhazmat.2011.07.005. Epub 2011 Jul 12.
Wormhole-shaped TiO(2)/Ti (WT) and nanotube-shaped TiO(2)/Ti (TNT) photoelectrodes were prepared by anodic oxidation method. The morphology and structure were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). It was found that both crystal types of WT and TNT photoelectrodes were composed of anatase and rutile TiO(2) phases; however TNT photoelectrodes had highly ordered nanostructure. The photoelectrochemical (PECH) and photoelectrocatalytic (PEC) properties of WT and TNT photoelectrodes were investigated by photocurrent transient, open-circuit potential and degradation rate of alachlor under the artificial solar light illumination. All results showed that TNT photoelectrodes prepared in NaF-Na(2)SO(4) solution have more excellent photoelectron properties than WT photoelectrodes prepared in H(2)SO(4) solution. The photocatalytic (PC) and PEC experiments of alachlor showed that PC and PEC activities of TNT photoelectrodes were superior to WT photoelectrodes. At applied bias potentials the degradation rate of alachlor at TNT photoelectrodes increased significantly to 94.5%. The higher PC and PEC performance of TNT photoelectrodes were ascribed to the long-range ordered structure and short-orientation diffusion distance of photogenerated carries.
采用阳极氧化法制备了具有虫孔状 TiO(2)/Ti(WT)和纳米管状 TiO(2)/Ti(TNT)的光电极。采用扫描电子显微镜(SEM)、X 射线衍射(XRD)和 X 射线光电子能谱(XPS)对其形貌和结构进行了表征。结果表明，WT 和 TNT 光电极的晶型均由锐钛矿和金红石 TiO(2)相组成;然而，TNT 光电极具有高度有序的纳米结构。通过光电流瞬态、开路电位和人工太阳光照射下莠去津的降解率研究了 WT 和 TNT 光电极的光电化学(PECH)和光电催化(PEC)性能。所有结果表明，在 NaF-Na(2)SO(4)溶液中制备的 TNT 光电极比在 H(2)SO(4)溶液中制备的 WT 光电极具有更优异的光电性能。莠去津的 PC 和 PEC 实验表明，TNT 光电极的 PC 和 PEC 活性均优于 WT 光电极。在施加偏置电位时，TNT 光电极上莠去津的降解率显著提高到 94.5%。TNT 光电极具有较高的 PC 和 PEC 性能，归因于光生载流子的长程有序结构和短取向扩散距离。
