Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
J Colloid Interface Sci. 2012 Oct 1;383(1):13-8. doi: 10.1016/j.jcis.2012.05.051. Epub 2012 Jun 17.
With the aim of improving the effective utilization of visible light, the LaVO(4)/TiO(2) heterojunction nanotubes were fabricated by sol-gel coupled with hydrothermal method. The photocatalytic ability was demonstrated through catalytic removal of gaseous toluene species. The nanotube samples were characterized by scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), surface photovoltage (SPV), Raman spectra and N(2) adsorption-desorption measurements. The characterization results showed that the samples with high specific surface areas were of typical nanotubular morphology, which would lead to the high separation and transfer efficiency of photo induced electron-hole pairs. The as-prepared nanotubes exhibited high photocatalytic activity in decomposing toluene species under visible light irradiation with fine photochemical stability. The enhanced photocatalytic performance of LaVO(4)/TiO(2) nanotubes might be attributed to the matching band potentials, the interconnected heterojunction of LaVO(4) versus TiO(2), and the large specific surface areas of nanotubes.
为了提高可见光的有效利用，采用溶胶-凝胶结合水热法制备了 LaVO(4)/TiO(2) 异质结纳米管。通过催化去除气态甲苯物种来证明光催化能力。通过扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)、X 射线衍射 (XRD)、表面光电压 (SPV)、拉曼光谱和 N(2) 吸附-脱附测量对纳米管样品进行了表征。表征结果表明，具有高比表面积的样品具有典型的纳米管状形态，这将导致光致电子-空穴对的高分离和转移效率。在可见光照射下，所制备的纳米管在分解甲苯物种方面表现出高的光催化活性，具有良好的光化学稳定性。LaVO(4)/TiO(2) 纳米管增强的光催化性能可能归因于匹配的能带势、LaVO(4)与 TiO(2) 的互连异质结以及纳米管的大比表面积。
