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Structural Refinement, Morphological Features, Optical Properties, and Adsorption Capacity of α-Ag2WO4 Nanocrystals/SBA-15 Mesoporous on Rhodamine B Dye

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Abstract

α-Ag2WO4 nanocrystals, mesoporous silica (SBA-15), and α-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), N2 adsorption/desorption, ultraviolet–visible (UV–Vis) diffuse reflectance spectroscopy, and Zeta potential. XRD patterns, Rietveld refinement, and XPS spectra confirmed the formation of α-Ag2WO4, SBA-15, and α-Ag2WO4/SBA-15. XPS spectra evidenced the formation of metallic silver during analysis. FE-SEM images illustrated the deposition of α-Ag2WO4 nanocrystals mainly on the external surface of SBA-15. N2 adsorption data showed that the textural properties of α-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 α-Ag2WO4, SBA-15, and α-Ag2WO4/SBA-15 correspond to Langmuir adsorption isotherm and pseudo-second-order kinetics. The maximum adsorption capacity of α-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.

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Acknowledgements

This work was funded by the following Grants – CNPq (455864/2014–4, 307559/2016–8, 305757/2018–0). The authors also wish to acknowledge financial support from the CAPES Institution.

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Authors and Affiliations

  1. Department of Chemistry, Federal University of Piaui, Teresina, PI, 64049-550, Brazil

    F. C. M. Silva, L. K. R. Silva & G. E. Luz Jr.

  2. Department of Chemistry, FANAT State University of Rio Grande Do Norte, Mossoró, RN, 59610-210, Brazil

    A. G. D. Santos & V. P. S. Caldeira

  3. GERATEC-CCN-DQ, State University of Piaui, João Cabral S/N, Teresina, PI, 64002-150, Brazil

    J. F. Cruz-Filho, L. S. Cavalcante & G. E. Luz Jr.

  4. CDMF-Universidade Estadual Paulista, P.O. Box 355, Araraquara, SP, 14801-907, Brazil

    E. Longo

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Silva, F.C.M., Silva, L.K.R., Santos, A.G.D. et al. Structural Refinement, Morphological Features, Optical Properties, and Adsorption Capacity of α-Ag2WO4 Nanocrystals/SBA-15 Mesoporous on Rhodamine B Dye. J Inorg Organomet Polym 30, 3626–3645 (2020). https://doi.org/10.1007/s10904-020-01560-3

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