反应温度对水热法合成V2O5粒径的影响及其光催化降解染料的性能
Impact of reaction temperatures on the particle size of V2O5 synthesized by facile hydrothermal technique and their auspicious photocatalytic performance in dye degradation
摘要：
在本研究中，采用绿色温和水热法，在100 °C ~ 200 °C的六个不同温度下，以20 °C为步长，全面研究了水热反应温度对V2 O 5合成及物性的影响。. XRD图谱证实了在所有反应温度下合成的样品具有稳定的正交晶体结构。SEM和TEM图像显示了颗粒状形貌，这些表征证实了颗粒尺寸随着反应温度的升高而变大。采用FTIR分析了产物的官能团，所得结果与XRD分析结果一致。已经使用UV-vis漫反射光谱（UV-DRS）在各种反应温度下估计了带隙，并且发现带隙在2.09 eV至2.15 eV之间变化，这是吸收显著量的可见光的合适范围。以亚甲蓝（MB）为目标染料，研究了合成样品的光催化降解性能.在较低的反应温度（100 °C）下合成的纯V2 O 5具有较低的带隙，因此具有较高的光催化效率。
英文摘要：
In this study, a complete study of the effect of hydrothermal reaction temperatures on the synthesis and physical properties of V2O5 using the green facile mild hydrothermal method has been performed with six different temperatures 100 °C to 200 °C, in the step of 20 °C. . The XRD pattern confirm the stable orthorhombic crystal structure of the synthesized samples at all reaction temperatures. The SEM and TEM images demonstrate the particle-like morphology, and these characterizations affirmed that the particles size became larger with the increase of reaction temperatures. The FTIR analysis is employed to study the functional groups, and the obtained results are consistent with the XRD analysis. The bandgap has been estimated at various reaction temperatures using UV-vis diffuse reflectance spectra (UV-DRS) and was found to be varied 2.09 eV to 2.15 eV that are suitable range to absorb a significant amount of visible light. The photocatalysis of methylene blue (MB) with synthesized samples has been accomplished to investigate photocatalytic efficiency. The pure V2O5 synthesized at lower reaction temperature (100 °C) possess a lower bandgap and, accordingly, higher photocatalytic efficiency.
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