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以Bi(NO_3)_3、Na_3VO_4和Fe(NO_3)_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BiVO_4。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BiVO_4具有由纳米片组装而成的多层级花状结构。SDBS在BiVO_4(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BiVO_4晶格后,导致BiVO_4发生晶格畸变,加大了BiVO_4局域结构的变形,形成了氧空位,并缩小了BiVO_4的带隙,从而促进BiVO_4光生电子和空穴的分离,拓宽BiVO_4的可见光吸收范围,有效提高BiVO_4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。
Bi (NO_3) _3, Na_3VO_4 and Fe (NO_3) _3 were used as raw materials and sodium dodecyl benzene sulfonate was used as the structure-directing agent to prepare iron-doped BiVO_4 by hydrothermal method. The structure, morphology and optical absorption properties of the samples were analyzed by XRD, SEM, TEM, HRTEM and UV-Vis. The results show that the iron doped BiVO 4 has a multilayered flower-like structure assembled by nanosheets. The selective adsorption of SDBS on the BiVO 4 (100) plane is the key reason for the formation of flower-like structures. Appropriate amount of iron ions into the BiVO_4 lattice, resulting in BiVO_4 lattice distortion occurs, increasing the deformation of BiVO_4 local structure, forming oxygen vacancies and reducing the band gap BiVO_4, thereby promoting BiVO_4 photogenerated electron and hole separation, Broaden the visible light absorption range of BiVO_4 and effectively improve the photocatalytic activity of BiVO_4. When the iron doping concentration is 2.5%, the photocatalytic activity of methyl blue is the highest.