以Bi(NO3)3、Na3VO4和Fe(NO3)3为原料,以十二烷基苯环酸钠为结构导向剂,采用水热法制备了铁掺杂BiVO4.利用XRD、SEM、TEM、HRTEM以及紫外-可见漫反射光谱(UV-Vis)对样品进行结构、形貌及光吸收性能分析.结果表明:铁掺杂BiVO4具有由纳米片组装而成的多层级花状结构.SDBS在BiVO4(100)晶面的选择性吸附是花状结构形成的关键原因.适量铁离子进入BiVO4晶格后,导致BiVO4发生晶格畸变,加大了BiVO4局域结构的变形,形成了氧空位,并缩小了BiVO4的带隙,从而促进BiVO4光生电子和空穴的分离,拓宽BiVO4的可见光吸收范围,有效提高BiVO4的光催化活性.当铁掺杂浓度为2.5%时,样品对甲基蓝的光催化活性最高.
Fe-doped BiVO4 with hierarchical flower-like structure was prepared via a hydrothermal method using sodium dodecyl benzene sulfonate (SDBS) as structure directing agent. X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), high resolution transmission electron microscope (HRTEM), X-ray photoelectron spectroscopy (XPS) and UV-Vis were applied for characterization of the as-prepared samples. The formation mechanism of flower-like structure was proposed based on the evolution of morphology as a function of hydrothermal time. Fe-doped into substitutional sites of BiVO4 effectively improved the migration and separation of photogenerated carrier and enhanced the utilization of visible light. Flower-like Fe-doped BiVO4 showed much higher visible-light-driven photocatalytic efficiency for degradation of methyl blue compared with the pristine BiVO4. And the sample with a Fe/Bi mole ratio of 2.5% showed the highest photocatalytic efficiency.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%