Department of Chemistry, Bacha Khan University Chrasadda, Khyber-Pakhtunkhwa 24420, Pakistan E-mail:
Department of Chemistry, Qauid-i-Azam University Islamabad, Islamabad 45320, Pakistan.
Water Sci Technol. 2022 Feb;85(4):1040-1052. doi: 10.2166/wst.2021.637.
Cadmium sulphide (CdS) nanoparticles (NPs) were synthesized through hydrothermal route and characterized by UV-Vis spectroscopy, X-ray diffraction (XRD), Energy dispersive X-ray analysis, Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy and Thermo gravimetric analysis (TGA).The band gap of CdS nanoparticles was found to be 2.38 eV. CdS NPs are crystalline aggregates with hexagonal structure as shown by SEM and XRD analysis. TGA study revealed that the synthesized nanomaterials were very stable to temperature and only 6.54% total loss occurred during heating range (25 °C-600 °C).The CdS NPs were used for the first time against the degradation of Eosin B (EB) and Methyl green (MG) dyes in aqueous solution.The degradation of EB and MG over CdS nanocatalysts followed second order kinetics. The predicted activation energies for both the dyes' reactions were 61.1 kJ/mol and 32.11 kJ/mol, respectively. About 95% and 90% dye degradation was observed at the time interval of 160 minutes for EB and MG, respectively. High percent degradation of EB was observed at high pH (pH 0) while at low pH (pH 4) high percent degradation was found for MG dye. Maximum dye degradation was found at the optimal dose (0.03 g/L) of the catalyst and at low dye concentration. The rate of EB and MG dye degradation was found to increase with increase in temperature up to 45 °C. The recyclability study showed that CdS nanoparticles could be reused for the degradation of the given dyes. Good antibacterial activity against Staphylococcus aureus was shown by CdS NPs. From the biocompatibility it was confirmed that CdS NPS are bioincompatible compatible.
硫化镉 (CdS) 纳米粒子 (NPs) 采用水热法合成，并通过紫外-可见分光光度法、X 射线衍射 (XRD)、能谱分析、扫描电子显微镜 (SEM)、傅里叶变换红外光谱和热重分析 (TGA) 进行了表征。CdS 纳米粒子的带隙为 2.38 eV。SEM 和 XRD 分析表明，CdS NPs 是具有六方结构的结晶聚集体。TGA 研究表明，合成的纳米材料对温度非常稳定，在加热范围内（25°C-600°C）仅发生 6.54%的总损失。CdS NPs 首次用于水溶液中对曙红 B (EB) 和甲基绿 (MG) 染料的降解。EB 和 MG 在 CdS 纳米催化剂上的降解遵循二级动力学。两种染料反应的预测活化能分别为 61.1 kJ/mol 和 32.11 kJ/mol。在 160 分钟的时间间隔内，观察到 EB 和 MG 的染料降解率分别达到 95%和 90%。在高 pH（pH 0）时观察到 EB 的高降解百分比，而在低 pH（pH 4）时，MG 染料的降解百分比较高。在催化剂的最佳剂量（0.03 g/L）和低染料浓度下，最大的染料降解率。随着温度升高至 45°C，EB 和 MG 染料的降解速率增加。循环使用研究表明，CdS 纳米粒子可重复用于降解给定的染料。CdS NPs 对金黄色葡萄球菌表现出良好的抗菌活性。从生物相容性方面证实了 CdS NPS 是生物不相容的。
