期刊
SOLID STATE SCIENCES
卷 96, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.solidstatesciences.2019.105951
关键词
Nanocomposites; Photocatalysts; Cerium dioxide; Cadmium sulfide; Methylene blue
资金
- National Research Council of Thailand [R2562B060]
To modify the photocatalytic activity of CeO2, CdS nanoparticles was composited with CeO2 through a homogeneous precipitation method. The crystal structure, composition, morphology, and optical properties of CdS/CeO2 composite were analyzed in detail. The results found that CdS/CeO2 composite consisted of the cubic fluorite structure of CeO2 and wurtzite hexagonal structure of CdS. Meanwhile, TEM magnification of CdS/CeO2 composite exhibited clear lattice fringe corresponding to [hkl] plane of CeO2 and CdS. UV-visible absorption spectra showed that CdS extended the adsorption edge of the CdS/CeO2 composite to longer visible region, which related to the decrease of band gap. The coexistence of staggered type II band alignment in the CdS/CeO2 composite facilitated the charge separation of visible-excited electrons and holes, thereby decreasing the recombination and improving the efficient photocatalytic activity for methylene blue dye degradation, with the apparent rate constant (0.0102 min(-1)) which is about 7 times higher than that of pure CeO2 (k=0.0014 min(-1)).
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