Electronic and optical competence of TiO2/BiVO4 nanocomposites in the photocatalytic processes
Electronic and optical competence of TiO2/BiVO4 nanocomposites in the photocatalytic processes
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DOI：
10.1038/s41598-020-69032-9
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发表时间：
2020-08-11
影响因子：
4.6
通讯作者：
Castaneda, H.
中科院分区：
文献类型：
--
作者：
Drisya, K. T.;Solis-Lopez, M.;Castaneda, H.
具有不同比例的二氧化钛和钒酸铋[TiO 2]/[BiVO 4]的纳米复合材料在其界面处产生相容的电子能带结构排列，以确保在可见光下增强的光活化电荷转移。采用溶胶-凝胶法和适当的合成后热处理方法合成了不同的复合材料，其中稳定的TiO 2和单斜白钨矿多晶型BiVO 4。结构，电子和光学特性进行了分析，结果作为一个功能的化学计量，其中两个晶体结构显示出明确的结形成其特征堆叠平面。在可见光照射下，研究了复合材料的光催化和（光）电化学响应，并测试了复合材料对偶氮染料（酸性蓝-113，AB-113）的降解率（接近99%）。结果表明，质量比为1：10的纳米复合材料的光催化效率最高。HRTEM图像显示了标记区域，其中两种晶体结构形成清晰的结和它们的特征平面。然而，网络中BiVO 4含量的增加克服了光催化活性，由于光生电子的还原电位降低，具有高复合率。
Nanocomposites with different ratios of titanium dioxide and bismuth vanadate [TiO2]/[BiVO4] give rise to compatible electronic band structure alignment at their interfaces to ensure enhanced photoactivated charge transfer under visible light. The sol-gel method and suitable post-synthesis thermal treatments were used to synthesize different compositions with stabilized anatase phase of TiO2 and monoclinic scheelite polymorph BiVO4. Structural, electronic and optical characterizations were performed and the results were analysed as a function of the stoichiometry, in which both crystalline structures show a clear junction formation among their characteristic stacking planes. Photocatalytic and (photo) electrochemical responses of the nanocomposites were investigated and tested for the degradation of azo dyes (Acid Blue-113, AB-113) (similar to 99%) under visible light radiation. The nanocomposite with a mass ratio of (1:10) shows the highest photocatalytic efficiency compared to the other compositions. HRTEM images showed marked regions in which both crystalline structures form a clear junction and their characteristic planes. However, the increase of BiVO4 content in the network overcomes the photocatalytic activity due to the decrease in the reduction potential of the photo-generated electrons with high recombination rates.