Preparation Of CdS/C Nanocomposites By Laser Liquid Phase Ablation And Its Photocatalytic Activity

Cadmium sulfide?CdS?is widely used in photoelectric conversion,photocatalysis and biosensing due to its excellent photoelectric properties,but the defects of CdS which are easily corroded by light and the toxicity of Cd²⁺itself hinder its application in industry.CdS/C nanocomposites can effectively improve the defects of CdS,so it has broad application prospects in the field of photocatalysis and optoelectronics.In this study,CdS/C nanocomposites were prepared by laser liquid phase ablation in isopropanol and water,respectively.Transmission electron microscopy?TEM?images showed the preparation of amorphous carbon-coated CdS@C core-shell nanomaterials in an isopropanol environment;in the water,CdS nanocomposites attached to flake graphene were prepared.Compared with the long reaction time of the traditional hydrothermal preparation method,the liquid phase laser ablation method can rapidly generate CdS/C nanocomposites at room temperature and normal pressure within a few minutes,and has higher purity than chemical methods.According to the electron microscope image,the diameter of the prepared CdS nanoparticles is mostly 10-20 nm,and the thickness of the carbon layer in the obtained core-shell structure is about 2-8nm.As the spot size becomes smaller,the product structure is from a mononuclear thin layer structure.Change to a multi-core thick layer structure.The catalytic activity of the CdS/C nanocomposites prepared by this method was confirmed in the experiment:within 40 min,the degradation rate of 20 mL 10 mg/L methyl orange?MO?dye reached99%,after 6 cycles of experiments.The degradation rate drops to 90%.The material prepared by this method has better catalytic performance than the CdS/C nanomaterial prepared by the conventional method.The method can rapidly prepare a CdS/C nanocomposite with high degradation rate.