Visible-light photocatalytic degradation of methylene blue with Fe doped CdS nanoparticles

► Fe doped CdS nanoparticles were synthesized by a chemical precipitation method. ► With increased the Fe doping concentration, the position of the Raman bands shifted towards higher wavenumbers and their intensities decreased drastically. ► Optical measurements indicated that the absorption edge shifted towards the longer wavelength side in Fe doped CdS nanoparticles. ► Fe doped CdS nanoparticles show excellent Photocatalytic activity under visible light irradiation. ► Optimum concentration of Fe doped CdS was observed to be 3 mol% for photocatalytic applications.