Abstract
Metal doped CdS nanoparticles were synthesized by a simple chemical precipitation route with different metals. The obtained nanoparticles were characterized by XRD and UV-vis reflectance spectroscopy. The results indicated that metal-doped CdS catalysts were successfully obtained with cubic structure and 4.0 - 4.5 nm crystallite size. The band gap energies of metal-doped CdS catalysts were estimated using UV-visible reflectance spectra to be about the range of 2.25 - 2.55 eV. Methylene blue was degraded by using metal doped CdS nanoparticles under a 400 W medium-pressure mercury lamp of visible light irradiation (λ > 420 nm). Higher degradation efficiency was achieved by adding metals to the photocatalyst compared with the single CdS catalyst. In this case, the degradation efficiency of Co-CdS catalyst after 4h irradiation time was about 87%.
Highlights
Environmental problems associated with organic pollutants provide the impetus for sustained fundamental and applied research in the area of environmental remediation
The results indicated that metal-doped Cadmium sulfide (CdS) catalysts were successfully obtained with cubic structure and 4.0 - 4.5 nm crystallite size
It means that wavelength which corresponds with band gap is decreased
Summary
Environmental problems associated with organic pollutants provide the impetus for sustained fundamental and applied research in the area of environmental remediation. Noble metal co-catalysts such as Pt, Pd, and Rh on CdS, can trap light-induced electrons and act as the active sites for H2 production and degradation of dyes from water. Investigation of CdS nanostructure has received considerable attention due to its size dependent properties and quantized charging effects on metal nanoparticles and provides the basis for developing new and effective systems. These nanostructures provide innovative strategies for designing generation energy conversion devices. We investigate optical properties of metal-doped (Ni, Co, Ce, Sb) CdS nanoparticles prepared by chemical co-precipitation method. Photocatalytic degradation of methylene blue was performed by using metal doped CdS nanoparticles under a 400 W medium-pressure mercury lamp of visible light irradiation (λ > 420 nm)
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