Surface Properties and Photocatalytic Activity of KTaO3, CdS, MoS2 Semiconductors and Their Binary and Ternary Semiconductor Composites

Abstract

Single semiconductors such as KTaO3, CdS MoS2 or their precursor solutions were combined to form novel binary and ternary semiconductor nanocomposites by the calcination or by the hydro/solvothermal mixed solutions methods, respectively. The aim of this work was to study the influence of preparation method as well as type and amount of the composite components on the surface properties and photocatalytic activity of the new semiconducting photoactive materials. We presented different binary and ternary combinations of the above semiconductors for phenol and toluene photocatalytic degradation and characterized by X-ray powder diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) specific surface area and porosity. The results showed that loading MoS2 onto CdS as well as loading CdS onto KTaO3 significantly enhanced absorption properties as compared with single semiconductors. The highest photocatalytic activity in phenol degradation reaction under both UV-Vis and visible light irradiation and very good stability in toluene removal was observed for ternary hybrid obtained by calcination of KTaO3, CdS, MoS2 powders at the 10:5:1 molar ratio. Enhanced photoactivity could be

A hydrothermally synthesized MoS2(1−x)Se2x alloy with deep-shallow level conversion for enhanced performance of photodetectors

“…From the absorption spectrum comparison of the three samples, it can be known that the absorption capacity of the spectrum absorption intensity in the range of 400 nm to 800 nm is MoSe 2 > MoSSe > MoS 2 , which is consistent with the literature. [25][26][27] The UV-vis spectra show that the absorption edges of MoSSe, MoS 2 and MoSe 2 are about 826 nm, 760 nm, 864 nm, respectively. According to the formula: 28 E ðeVÞ ¼ hc l , where E, h, l and c are the band gap energy of the semiconductor material, Planck constant, wavelength of light and speed of light, respectively.…”

KTaO3-based nanocomposites for air treatment

“…Nanocomposites were obtained by one-pot synthesis (named 1-step hydrothermal mixing solutions) and by 2-step hydrothermal synthesis as was recently reported by us for KTaO 3 -CdS-MoS 2 nanocomposites [19]. In one-pot synthesis rout, all reagents in specified molar ratio of products were mixed, transferred into autoclave and thermally treated under the selected conditions.…”

Tantalate-based Perovskite for Solar Energy Applications

“…Zaleska et al prepared a series of novel binary and ternary composite photocatalysts based on the combination of KTaO 3 , CdS and MoS 2 semiconductors via hydro/solvothermal precursor route. They found that the highest photocatalytic activity toward phenol degradation under both UV-Vis and visible light irradiation and superior stability in toluene removal was observed for ternary hybrid obtained by calcination of KTaO 3 , CdS and MoS 2 powders at the 10: 5: 1 molar ratio [43].…”