Bleaching, demethylation and degradation of methylene blue by CoS/nanoAlMCM41 under ambient condition and visible light

The photocatalytic degradation of methylene blue is investigated in aqueous solution containing CoS/nanoAlMCM-41 photocatalyst under visible light. The catalyst is characterized by X-ray diffraction (XRD), UVVis diffused reflectance spectra (UV-Vis DRS) and scanning electron microscopy (SEM) techniques. The effect of CoS, nanoAlMCM-41 support and different wt% of CoS over the support on the photocatalytic degradation and influence of parameters such as CoS loading, catalyst a mount, pH and initial concentration of methylene blue on degradation are evaluated. The bleaching of methylene blue MB, by sulfide ion, in an aqueous solution is studied in the presence nanoAlMCM-41 catalyst. In the presence of sulfide ions, MB is bleached to its colorless leuco (LMB) and MBH2 + forms.

Keywords:

Bleaching , Degradation , NanoAlMCM-41 , Scanning electron microscopy , photocatalyst