Fabrication of CdMoO₄@CdS core–shell hollow superstructures as high performance visible-light driven photocatalysts

Abstract

CdMoO4@CdS core-shell hollow microspheres with the diameter of 2-3 μm were synthesized through a simple ion exchange hydrothermal method by using CdMoO4 solid microspheres as the sacrificial template in the presence of thioacetamide (TAA). Based on the detailed investigation it was found that the concentration of TAA in the starting solution affects the size of the CdS nanosheets and the hollowing process. At the TAA concentration of 0.1 M, CdMoO4@CdS core-shell hollow spheres with a CdS nanosheet thickness of 50-100 nm were obtained. The formed CdS nanosheets have a hexagonal wurtzite structure and exhibit good size uniformity and regularity. Furthermore, the photocatalytic activity of the as-prepared samples was evaluated towards degradation of Rhodomine B (RhB) aqueous dye solution under visible-light. Compared to CdMoO4 microspheres, CdMoO4@CdS core-shell hollow microspheres show enhanced photocatalytic activity. The observed photocatalytic performance was attributed to the synergetic effects of composite morphology, pore structure, and exposed two-dimensional (2D) CdS nanosheets with dominant 001 facets in CdMoO4@CdS core-shell hollow microspheres. Furthermore, the growth mechanism of CdMoO4@CdS hollow microspheres was discussed in detail.

Preparation of Salen–Metal Complexes (Metal = Co or Ni) Intercalated ZnCr-LDHs and Their Photocatalytic Degradation of Rhodamine B

“…After 7 h photodegradation reaction, the degradation rates of ZnCoCr-LDHs and ZnNiCr-LDHs to RhB were only 42.10% and 45.74%. Meanwhile, in similar experimental conditions, ZnCr-0.75SalenCo-LDHs and ZnCr-0.75SalenNi-LDHs also exhibited better photocatalytic activities of RhB degradation than some other types of photocatalytic materials such as TiO2-diatomite composite [43], CdMoO4@CdS [44], and BiVO4/TiO2 [45]. The kinetic parameters of RhB photocatalytic degradation by ZnCr-0.75SBCo-LDHs, ZnCr-0.75SBNi-LDHs, and traditional LDHs were investigated based on the Langmuir-Hinshelwood model [46,47].…”

A novel synthetic route towards monodisperse LaOF:Ln3+ (Ln = Eu, Tb) hollow spheres with multicolor luminescence properties

“…In the initial stage, the monodisperse La(OH)CO 3 spheres employed as the sacrificial template were synthesized via urea-based homogeneous precipitation. In the following process, La(OH)CO 3 is hydrolyzed to the La 3+ , OH − , and CO 3 2− ions meanwhile BF 4 − is slowly hydrolyzed to F − and H + ions, which promote the dissolution of La(OH)CO 3 . Then, the La 3+ ions react with F − and CO 3 2− in the solution to generate LaCO 3 F nanoparticles, which form a layer of LaCO 3 F shell located at the surface of La(OH)CO 3 spheres.…”

“…[1][2][3][4][5] And a variety of strategies have been adopted for the design and synthesis of hollow spheres. Template process is the most efficient and common method for such materials.…”

Break the Interacting Bridge between Eu3+ Ions in the 3D Network Structure of CdMoO4: Eu3+ Bright Red Emission Phosphor

“…Cadmium molybdate CdMoO 4 with scheelite-type structure have attracted considerable interest due to its potential applications in phosphors, scintillators, magnets and catalysts 13,14 . Eu 3+ -doped metal molybdates is a kind of potential red emitting phosphor due to their predominant 5 D 0  →  7 F 2 transition emission, whereas the other emissions are very weak 15 .…”