Facile Synthesis of Uniform CdS Hollow Spheres in an Ethanol System and Their Enhanced Photocatalytic Activity

Abstract

The monodisperse, flowerlike CdS hollow spheres have been successfully synthesized by employing sulfur as the sulfate sources from a solution of H4SiW12O40 (SiW12) in ethanol through UV irradiation. The SiW12 that serves as photocatalyst plays a very important role on the synthesis of CdS crystals. The morphologies of the synthesized CdS crystals could be controlled by adjusting experimental parameters, such as initial precursor ratios, reaction time, and concentration of reagents. The possible mechanism of formation for the CdS nanostructures is proposed based on the experimental results. The Brunauer–Emmett–Teller (BET) surface area of the CdS hollow spheres calculated from the N2 adsorption isotherm is 175.8 m2 g−1, which is much larger than the value reported in previous reports. The optical properties of CdS hollow structures have also been studied. Importantly, the CdS hollow nanostructures have extraordinary photocatalytic activity for the photodegradation of rhodamine B (RhB) under irradiation with visible light.

Efficient Fluoride Removal Using Nano MgO: Synthesis, Mechanisms, and Performance Evaluation

“…These two absorption peaks at 1430.45 cm − 1 and 1033.38 cm − 1 further con rm the presence of H − ions on the surface of the nano powder [52]. From Fig.…”

Synthesis of hollow and spherical cadmium sulphide nanoparticles by an unconventional design of bioelectrochemical system

“…The hollow sphere of CdS has been reported to be an extraordinary photocatalytic activity 34 and electro-generated chemiluminescence H 2 O 2 sensor 32 ; therefore, we investigated the UV-Vis absorption spectrum of the CdS nanoparticles. The absorption spectrum of CdS-NPs shows a shoulder peak at ∼ 460 nm, equivalent to the band gap energy of 2.69 eV based on the energy equation of quantum mechanics (Figure 4).…”

“…The authors also proposed a precipitation model for the formation of hollow sphere structure of CdS as the following: (i) CdS molecules are homogeneously precipitated, (ii) the nuclei then grow to single-phase (hexagonal or cubic) crystallites, and finally (iii) the crystallites are aggregated or cemented by continuing crystal growth or recrystallization into polycrystalline (mostly mixed-phase particles). 33 The hollow sphere of CdS has been reported to be an extraordinary photocatalytic activity 34 and electro-generated chemiluminescence H 2 O 2 sensor 32 ; therefore, we investigated the UV-Vis absorption spectrum of the CdS nanoparticles. The absorption spectrum of CdS-NPs shows a shoulder peak at ∼ 460 nm, equivalent to the band gap energy of 2.69 eV based on the energy equation of quantum mechanics (Figure 4).…”

Hollow Structured Metal Sulfides for Photocatalytic Hydrogen Generation

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