Structural Refinement, Morphological Features, Optical Properties, and Adsorption Capacity of alpha-Ag2WO4 Nanocrystals/SBA-15 Mesoporous on Rhodamine B Dye
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Data
2020-05-02
Autores
Silva, F. C. M.
Silva, L. K. R.
Santos, A. G. D.
Caldeira, V. P. S.
Cruz-Filho, J. F.
Cavalcante, L. S.
Longo, E. [UNESP]
Luz Jr., G. E.
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Editor
Springer
Resumo
alpha-Ag2WO4 nanocrystals, mesoporous silica (SBA-15), and alpha-Ag2WO4/SBA-15 as a nanocomposite were prepared by sonochemical, hydrothermal, and in situ sonochemical methods respectively. Samples were characterized by X-ray diffraction (XRD), Rietveld refinement, micro-Raman, Fourier-transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), N-2 adsorption/desorption, ultraviolet-visible (UV-Vis) diffuse reflectance spectroscopy, and Zeta potential. XRD patterns, Rietveld refinement, and XPS spectra confirmed the formation of alpha-Ag2WO4, SBA-15, and alpha-Ag2WO4/SBA-15. XPS spectra evidenced the formation of metallic silver during analysis. FE-SEM images illustrated the deposition of alpha-Ag2WO4 nanocrystals mainly on the external surface of SBA-15. N-2 adsorption data showed that the textural properties of alpha-Ag2WO4/SBA-15 were similar to pure SBA-15. Zeta potential data demonstrated that all samples synthetized have negatively charged surface. The materials were tested as adsorbents for the dye cationic rhodamine B. The adsorption behavior of rhodamine B onto alpha-Ag2WO4, SBA-15, and alpha-Ag2WO4/SBA-15 correspond to Langmuir adsorption isotherm and pseudo-second-order kinetics. The maximum adsorption capacity of alpha-Ag2WO4/SBA-15 was up to 150 mg g(-1) and 99% removal efficiency for RhB 20 mg L-1 in 15 min. Furthermore, 80% of RhB could be recuperated from adsorbents at pH 7. Graphic
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alpha-Ag2WO4 nanocrystals, Sonochemical, SBA-15, Adsorption, Rhodamine
Como citar
Journal Of Inorganic And Organometallic Polymers And Materials. Dordrecht: Springer, v. 30, n. 9, p. 3626-3645, 2020.