Comparative Study of Visible Light Induced MWCNTs Dispersed CdS and ZnS based Photocatalyst

In this study, MWCNTs/CdS and MWCNTs/ZnS composites were synthesized by an environmentally friendly chemical method. The multiwalled carbon nanotubes (MWCNTs) dispersed sulfide composites are used in the treatment of organic pollutants methylene blue (MB) from wastewater with low production cost under visible light. The bandgap study reported that increasing the doping percentage of MWCNTs in sulfides decreases bandgap energy for shift absorbance in the visible region. The visible light activated composite photocatalyst based photocatalytic activity was examined by the removal rate of methylene blue. Methylene blue has degraded in the presence of CdS and ZnS was about 140 minutes, whereas MWCNTs/CdS and MWCNTs/ZnS composites was observed only after about 100 minutes under visible light. It is found that from the study, the order of higher degradation percentage of methylene blue is MWCNTs/CdS > MWCNTs/ZnS > CdS> ZnS. The structure and morphology of the composite material were characterized XRD and SEM, respectively. The photocatalytic properties of composite material were studied by the UV-visible spectroscopy.