Photocatalytic activity to remove the effect of methylene blue dye by using CdS nanocrystalline under visible light

Document Type : Research Paper


1 Department of Material Science, Polymer Research Centre, University of Basrah, Iraq.

2 Chemical Engineering Department, College of Engineering, University of Basrah, Iraq.

3 Department of Material Science, Polymer Research Centre, University of Basrah, Iraq

4 School of Electrical Engineering, Faculty of Engineering, University of Technology Malaysia (UTM).

5 3Department of Chemistry, Science College, University of Basrah, Basrah, Iraq.

6 Department of Physics, Faculty of Science, University of Kufa, Iraq


Porous CdS nanocrystalline thin film was synthesized via chemical bath deposition. The XRD (X-ray diffraction) pattern of the porous shows the cubic structure. FESEM (Field emission scanning electron microscopy) analysis shows that the surface of Cadmium sulfide (CdS) is a porous shape. The EDX (energy dispersive X-ray spectroscopy) Technique assures the presence of Cd and S elements in the sample. To determine the band gap energy of porous CdS, UV-visible absorption spectra were analyzed, revealing an estimated value of approximately 2.39 eV. Subsequently, the photocatalytic degradation of methylene blue was using porous CdS as the catalyst. This degradation process took place under visible light irradiation from a 200-W xenon lamp. The utilization of porous CdS in this photocatalytic reaction demonstrates its potential as an effective catalyst for the degradation of methylene blue, a commonly used dye in various industries. To our knowledge, there is no previous study about porous CdS acting as catalysis to remove methylene blue dye. In seven hours, porous CdS removed 72% of methylene blue.