Longo Giulia, Fresno Fernando, Gross Silvia, Štangar Urška Lavrenčič
Laboratory for Environmental Research, University of Nova Gorica, Vipavska 13, 5000, Nova Gorica, Slovenia.
Environ Sci Pollut Res Int. 2014 Oct;21(19):11189-97. doi: 10.1007/s11356-014-2624-2. Epub 2014 Feb 19.
BiVO4/TiO2 composites with different weight ratios have been prepared by coprecipitation-based reactions followed by either thermal or hydrothermal treatment with the aim of evaluating the TiO2 photosensitization by BiVO4. The obtained materials present in all cases the desired monoclinic phase of BiVO4 and anatase phase of TiO2. Visible light absorption increased with increasing amount of bismuth vanadate. XPS results reveal the surface enrichment of Ti with respect to the bulk composition in samples characterised by a higher content of BiVO4. The photocatalytic activity of the prepared materials was tested for the degradation of isopropanol in the gas phase under indoor illumination conditions. Although none of the composites was able to improve the activity of TiO2, the low BiVO4 containing samples appear as more suitable for further synthesis tuning.
通过基于共沉淀的反应，随后进行热处理或水热处理，制备了不同重量比的BiVO4/TiO2复合材料，目的是评估BiVO4对TiO2的光敏化作用。在所有情况下，所获得的材料均呈现出所需的BiVO4单斜相和TiO2锐钛矿相。可见光吸收随着钒酸铋含量的增加而增加。XPS结果表明，在以较高BiVO4含量为特征的样品中，Ti相对于整体组成在表面富集。在室内光照条件下，测试了所制备材料对气相异丙醇降解的光催化活性。尽管没有一种复合材料能够提高TiO2的活性，但低BiVO4含量的样品似乎更适合进一步的合成调整。
