Microwave Hydrothermal Synthesis and Photocatalytic Performance of ZnO and M:ZnO Nanostructures (M = V, Fe, Co)
Nenhuma Miniatura disponível
Data
2012-01-01
Autores
Milao, Thais M.
de Mendonca, Vagner R.
Araujo, Vinicius D.
Avansi, Waldir [UNESP]
Ribeiro, Caue
Longo, Elson [UNESP]
Bernardi, Maria I.
Título da Revista
ISSN da Revista
Título de Volume
Editor
Amer Scientific Publishers
Resumo
ZnO and doped M:ZnO (M = V, Fe and Co) nanostructures were synthesized by microwave hydrothermal synthesis using a low temperature route without addition of any surfactant. The transition metal ions were successfully doped in small amount (3% mol) into ZnO structure. Analysis by X-ray diffraction reveals the formation of ZnO with the hexagonal (wurtzite-type) crystal structure for all the samples. The as-obtained samples showed a similar flower-like morphology except for Fe:ZnO samples, which presented a plate-like morphology. The photocatalytic performance for Rhodamine B (RhB) degradation confirmed that the photoactivity of M:ZnO nanostructures decreased for all dopants in structure, according to their eletronegativity. Photoluminescence spectroscopy was employed to correlate M:ZnO structure with its photocatalytical properties. It was suggested that transition metal ions in ZnO lattice introduce defects that act as trapping or recombination centers for photogenerated electrons and holes, making it impossible for them reach the surface and promote the photocatalytical process.
Descrição
Palavras-chave
Zinc Oxide, Microwave Hydrothermal, Doping, Photocatalysis
Como citar
Science of Advanced Materials. Valencia: Amer Scientific Publishers, v. 4, n. 1, p. 54-60, 2012.