This study aimed to synthesize Bi2Fe4O9 and apply it to the degradation of tartrazine yellow dye. Bi2Fe4O9 was synthesized using the solid-state reaction and the Pechini method. The materials obtained were characterized using X-ray diffraction (XRD), visible ultraviolet spectroscopy (UV-Vis) and field emission scanning electron microscopy (FEG). The microscopic images revealed a morphological difference between the two materials in which the material obtained by the Pechini method is the most porous and have the largest surface area. The pellet obtained by the Pechini method was seen to have a lower bandgap value when compared with the sample solid state reaction. In the photocatalysis tests, the best performance was also that of the material obtained by the Pechini method, with 99.34% degradation, while the material obtained by solid state reaction showed 85.86% in 120 minutes. The solution degraded with the material obtained by the Pechini method presented 81.66% of mineralization while the solution with the material obtained by solid state reaction showed 60.97% of mineralization. The results confirmed that the material obtained by both syntheses is able to maintain its effectiveness after 10 repetitions of the photocatalytic process, proving to be promising for waste treatment in the industrial field.

中文翻译：

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颗粒形式的Bi2Fe4O9是废水处理过程中的替代方法。

本研究旨在合成Bi2Fe4O9，并将其应用于酒石黄染料的降解。使用固态反应和Pechini方法合成了Bi2Fe4O9。使用X射线衍射（XRD），可见紫外光谱（UV-Vis）和场发射扫描电子显微镜（FEG）对获得的材料进行表征。显微图像揭示了两种材料之间的形态差异，其中通过Pechini方法获得的材料是最多孔的并且具有最大的表面积。与样品固态反应相比，可以看到通过Pechini方法获得的沉淀物具有较低的带隙值。在光催化测试中，最佳性能也是通过Pechini方法获得的材料，具有99.34％的降解，固相反应得到的材料在120分钟内显示为85.86％。用Pechini方法获得的材料降解的溶液呈现出81.66％的矿化度，而具有固相反应获得的材料的溶液呈现出60.97％的矿化度。结果证实，通过两种合成获得的材料在重复10次光催化过程后能够保持其有效性，被证明对工业领域的废物处理是有希望的。