Nano-Physics & Nanotechnology Research Lab, Dept. of Physics, Tripura University (A Central University), Suryamaninagar, Agartala, Tripura, India.
Nano-Physics & Nanotechnology Research Lab, Dept. of Physics, Tripura University (A Central University), Suryamaninagar, Agartala, Tripura, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2020 Apr 15;231:118122. doi: 10.1016/j.saa.2020.118122. Epub 2020 Feb 3.
Methyl orange is widely used dye in textile industry and later, it becomes the major component of industrial waste and pollutes different water body. So, its degradation is required especially in the case of drinking water. Here, chemically synthesized ligand free CdS nanocrystals have been utilized as a photocatalyst to degrade this dye in water. The mean size of the CdS nanocrystal has been found to be 7 nm approximately from TEM analysis, and SAED pattern shows that these are crystalline in nature. Further, the XRD patterns confirms the cubic structure of CdS nanoparticles and mean size calculated from XRD analysis matches well with the obtained size from TEM study. NMR study clearly verifies that CdS nanocrystals are ligand free stable nanoparticles. Due to this absence of ligand on the surface of CdS nanocrystals, a much enhanced MO degradation has been observed, as the e-h pair in the CdS and subsequent generation of free radicals such as hydroxyl, can efficiently oxidize the organic material MO and therefore, degrade this pollutant faster under visible light illumination. The degradation efficiency is found to be 95% after 300 min of illumination, which is much better than the other similar reports.
甲基橙是纺织工业中广泛使用的染料，后来成为工业废物的主要成分，污染了不同的水体。因此，特别是在饮用水的情况下，需要对其进行降解。在这里，我们使用化学合成的无配体 CdS 纳米晶体作为光催化剂来降解水中的这种染料。从 TEM 分析中可以发现 CdS 纳米晶体的平均尺寸约为 7nm，SAED 图案表明这些晶体是具有结晶性的。此外，XRD 图谱证实了 CdS 纳米粒子的立方结构，并且从 XRD 分析中计算出的平均尺寸与从 TEM 研究中获得的尺寸非常吻合。NMR 研究清楚地证实了 CdS 纳米晶体是无配体的稳定纳米颗粒。由于 CdS 纳米晶体表面没有配体，因此观察到 MO 的降解得到了很大的增强，因为 CdS 中的 e-h 对以及随后产生的自由基（如羟基）可以有效地氧化有机材料 MO，因此在可见光照射下更快地降解这种污染物。在 300 分钟的光照后，降解效率达到 95%，这比其他类似的报道要好得多。
