Study of photo-catalytic degradation of MB dye a water pollutant from sonochemically synthesized CdSe:Zn nanoparticles

摘要

Cadmium Selenide (CdSe) and Zinc doped Cadmium Selenide nanostructures were synthesized by the reaction of Cadmium acetate [Cd(CH_3COO)_2·2H_2O], Sodium Selenosulphate, hydrazine hydrate (N_2H_4·H_2O) in distilled water and in presence of NaOH by sonochemical method. The crystal structure, surface morphology and optical properties of the pure CdSe and Zn doped CdSe were examined by using X-Ray diffractometer, Scanning Electron Microscopy, Fourier Transform Infrared, UV-Vis Spectrophotometer. According to X-Ray diffraction study showed the hexagonal crystal structure, with decrease in doping concentration in CdSe, the particle size decreases. Scanning Electron Microscopy images were used to examine surface morphology, phase structure. FTIR results show the bonding on the surface of CdSe nanoparticles. UV-Vis spectroscopy result shows the band gap energy was found to vary between 1.81 and 2.25 eV due to the incorporation of Zn. The as-synthesized CdSe composite efficiently catalyzed the photodegradation of methylene blue in aqueous solutions under visible-light irradiation, exhibiting higher photocataytic activity.