Abstract Morphological transformations of the MoO2 sample sintered at 550°C, 650°C, 750°C and 850°C in the open air are revealed by the respective FESEM images. Microstructure characterization of these sintered samples has been accomplished by analyzing the XRD patterns employing Rietveld refinement technique, TEM images and FTIR spectra. Formation of a single orthorhombic α-MoO3 phase with layered microbar morphology has been revealed after sintering at 650°C and with increasing sintering temperature existence of another isostructural MoO2.5(OH)0.5 phase is noticed with a significant increase in the length of these microbars. Optical bandgaps of the sintered semiconducting samples have been determined using respective UV–vis absorption spectra. The degradation of the model organic pollutant RhB under visible light in aqueous solution has been investigated by the sample sintered at different temperatures and compared with the unsintered sample. Significantly degradation of RhB (∼91 %) under visible light with the sample sintered at 650°C for 2h.

中文翻译：

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烧结氧化钼的优化增强光降解活性：废水处理中的形态层次

摘要 分别在 FESEM 图像中显示了在露天 550°C、650°C、750°C 和 850°C 下烧结的 MoO2 样品的形态转变。这些烧结样品的微观结构表征是通过使用 Rietveld 精修技术、TEM 图像和 FTIR 光谱分析 XRD 图案来完成的。在 650°C 下烧结后，发现形成了具有层状微棒形态的单个正交 α-MoO3 相，并且随着烧结温度的升高，注意到另一种同构 MoO2.5(OH)0.5 相的存在，这些相的长度显着增加微吧。已使用各自的紫外-可见吸收光谱确定了烧结半导体样品的光学带隙。通过在不同温度下烧结的样品并与未烧结的样品进行比较，研究了模型有机污染物 RhB 在水溶液中在可见光下的降解。样品在 650°C 下烧结 2 小时，在可见光下显着降解 RhB（~91%）。