Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.
Molecules. 2023 Jan 23;28(3):1140. doi: 10.3390/molecules28031140.
The monoclinic nanocrystalline NiMnWO heterostructure has been successfully synthesized by the hydrothermal technique for achieving better sensitive and photocatalytic performances. Different characterization techniques such as X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible (UV-Vis), and photoluminescence (PL) spectroscopy have been employed to investigate their structural, microstructural, and optical properties. Mn-ion incorporation in the NiWO lattice reduces the particle size of the sample compared with the pure undoped NiWO sample, which has been confirmed from the transmission electron microscope image. The Tauc plot of the NiMnWO sample exhibits a significant decrease in bandgap energy compared with the pure undoped NiWO sample due to the quantum confinement effect. Finally, the material was explored as a photocatalyst for the degradation of methyl orange (MO) dye from wastewater under visible light irradiation. Various reaction parameters such as pH, catalyst dose, reaction time, and kinetics of the photodegradation were studied using the batch method. The results showed that the NiMnWO is highly efficient (94.51%) compared with undoped NiWO (65.45%). The rate of photodegradation by NiMnWO (0.067) was found to be 1.06 times higher than the undoped NiWO (0.062).
通过水热技术成功合成了具有单斜晶结构的纳米晶 NiMnWO 异质结构，以实现更好的敏感和光催化性能。采用 X 射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、紫外-可见（UV-Vis）和光致发光（PL）光谱等不同的表征技术来研究其结构、微观结构和光学性质。Mn 离子掺入 NiWO 晶格中，与纯未掺杂的 NiWO 样品相比，样品的粒径减小，这从透射电子显微镜图像中得到了证实。由于量子限制效应，NiMnWO 样品的 Tauc 图显示带隙能显著降低，与纯未掺杂的 NiWO 样品相比。最后，该材料被探索为可见光照射下从废水中降解甲基橙（MO）染料的光催化剂。使用批量法研究了各种反应参数，如 pH 值、催化剂剂量、反应时间和光降解动力学。结果表明，NiMnWO 比未掺杂的 NiWO（65.45%）效率更高（94.51%）。NiMnWO 的光降解速率（0.067）比未掺杂的 NiWO（0.062）高 1.06 倍。
