Porous silicon layer decorated with PbS nanoparticles by SILAR method for enhanced photocatalytic degradation of amido black dye
摘要
The effect of lead sulfide (PbS) decoration on the photocatalytic properties of porous silicon (PS) was investigated. The PbS nanoparticles (PbS-NPs) are prepared by the successive ionic layer adsorption and reaction method (SILAR). The microstructure, surface morphology, phase composition, and optical properties of the prepared structure were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM and high-resolution mode HRTEM), and UV–Vis spectroscopy respectively. The PbS nanoparticle properties were altered by changing the SILAR cycles number (10 to 60 cycles) permitting a well-control of PbS-NP size and density. The synthesized nanohybrid system photocatalytic activity was investigated via the degradation of amido black dye (AB) as a pollutant model. The tested structures showed that the best enhancement of the photocatalytic removal of AB was reached with PbS-NPs deposited during 60 SILAR cycles with a reaction rate of 0.01096 min−1, exceeding that of pure PS layer.