【摘要】 以Bi（NO₃）₃、Na₃VO₄、Na₂WO₄为原料,以SDS为结构导向剂,采用水热法制备了W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:W掺杂单斜相BiVO₄具有由纳米片组装而成的多层级花状结构,这种结构具有较大的比表面积,可增加样品对光的吸收。SDS在BiVO₄（100）晶面的选择性吸附是花状结构形成的关键原因。W掺杂能有效提高BiVO₄的光催化活性,当W掺杂浓度为2.5%时,样品对MB的光催化活性最高。这是因为当适量的W离子进入BiVO₄晶格并实现V位替代后,导致BiVO₄发生晶格畸变,增大了BiVO₄内电势,并在BiVO₄的禁带内引入了施主能级,促进了BiVO₄光生电子与空穴的分离,提高了BiVO₄的量子效率。更多还原

【Abstract】 In the present study,W doped BiVO₄ with hierarchical flower-like shape was synthesized via a SDS assisted hydrothermal approach with Bi（NO₃）₃,Na₃VO₄,and Na₂WO₄ as starting materials.XRD,SEM,TEM,HRTEM,XPS and UV-vis were apllied for characterization of the as prepared samples.The results showed that the hierarchical flowerlike structures of W doped BiVO₄ were actually formed by the oriented assembly of nanosheets.The selective adsorption of SDS on the（100）facet of BiVO₄ played a key role in the formation and oriented assembly of nansheets.W doping effectively improved the photocatalytic efficiency of BiVO₄ for degradation of MB under visible light irradiation.The substitution of V by W in BiVO₄ resulted in the crystal distortion and introduced the donor level into the band gap of BiVO₄,improving the quantum yield of BiVO₄.更多还原