Synthesis and Characterization of Metal-Doped (Ni, Co, Ce, Sb) CdS Catalysts and Their Use in Methylene Blue Degradation under Visible Light Irradiation

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%.

Cost-effective equipment for surface pre-treatment for cleaning and excitation of substrates in semiconductor technology

“…2a. The spectral line distribution is similar to that of a mercury vapour lamp (compare to [52]). In particular, the peak at 253.7 nm was important for the possibility of removing biogradable contamination on the surfaces and was detected with the spectrometer.…”

Chemical Precipitation Method for the Synthesis of Nb₂O₅ Modified Bulk Nickel Catalysts with High Specific Surface Area

“…According to the related mechanistic study in the chemical precipitation methods of nanoparticles, the amount of the Brønsted sites are highly dependent on the amount of remaining water on the catalysis. 24 Thus, controlling the drying periods and the calcination temperature of catalysts are also critical steps in the protocol in order to optimize the catalytic properties of the catalysts.…”

Adsorption and visible-light photodegradation of organic dyes with TiO2/conjugated microporous polymer composites

“…11 and 12) and other metal oxides and sulphides. [13][14][15][16] However, these inorganic semiconductors oen suffer from limited surface area and wide band gap (only UV responsive), severely restricting their practical applications. [17][18][19] Hence, it is highly desirable to develop material systems which can simultaneously adsorb organic dyes in aqueous solutions and photodegrade them under visible light.…”