One-step preparation of CdS nanocrystals supported on thiolated silica-gel matrix and evaluation of photocatalytic performance.
Here we report the use of a thiol-functionalized silica-gel to prepare supported CdS nanocrystals by a facile one-step procedure. Upon changing the relative proportion of the matrix we obtained nanocrystals with different average sizes and size distributions, as evidenced by spectroscopic measurements as well as TEM images. Photoluminescence spectra also indicated that the main effect of the matrix is related to the size control since the spectral profiles were found to be strongly dependent on the excitation wavelength. The performance of the material in the photocatalytic degradation of two commercial dyes (methylene blue and rhodamine 6G) has been tested under sunlight radiation, showing promising results. Almost complete decolorization has been observed after 80 min of exposure, with no adsorption on the silica surface.
Programa da Pós-graduação em Ciência e Engenharia de Materiais, Universidade Federal de Sergipe, Av. Marechal Rondon s/n, Cidade Universitária Prof. José Aloísio de Campos, CEP 491000-000, São Cristóvão, SE, Brazil.
George R S
GR
Andrade
Cristiane C
CC
Nascimento
Erick C
EC
Neves
Cintya D'Angeles Espirito Santo
CD
Barbosa
Luiz P
LP
Costa
Ledjane S
LS
Barreto
Iara F
IF
Gimenez
D019187:Cadmium Compounds / Q000737:chemistry*; D002384:Catalysis; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles; D010777:Photochemistry; D033362:Powder Diffraction; D058428:Silica Gel / Q000737:chemistry*; D013438:Sulfhydryl Compounds / Q000737:chemistry*; D013440:Sulfides / Q000737:chemistry*
D019187:Cadmium Compounds; D013438:Sulfhydryl Compounds; D013440:Sulfides; C034939:cadmium sulfide; D058428:Silica Gel