Abstract
In the recent years, the development of new and efficient materials for photocatalytic processes has been of growing interest for applications in wastewater treatment. In this sense, TiCl4 stabilized with H2SO4 was precipitated with ammonium hydroxide in the presence of sodium dodecyl sulfate and calcined to obtain thermally stable TiO2 nanoparticles, which were subsequently coated with semiconducting polypyrrole (PPy) by chemical oxidation resulting in a composite of TiO2@PPy. TiO2 and TiO2@PPy composite were characterized by SEM, Raman, XRD, UV/Vis–NIR, FTIR and TGA. It was observed that TiO2 consisted of spherical nanoparticles with number-average particle diameter of 19.2 nm and polydispersity index in sizes of 1.2, whereas TiO2@PPy composite consisted of agglomerated spherical PPy nanoparticles of number-average diameter of 182.4 nm coating TiO2 nanoparticles. The calculated optical bandgap of TiO2 was 3.07 eV, and it was demonstrated by the Rietveld refinement method of the XRD spectrum and from the Raman analysis that synthesized TiO2 corresponds to highly pure rhombic anatase crystal structure. TiO2@PPy composite was tested in the photodegradation of the reactive red 120 azo dye in aqueous solutions under visible light irradiation. It was observed that photodegradation rate increased with decreasing the initial dye concentration and increasing the composite load. Almost 100% of dye removal was achieved after 45 min of reaction for 20 mg L−1 of initial dye concentration and 1.0 g L−1 of composite load.
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Acknowledgements
V.M. Ovando-Medina acknowledges to CONACYT-México (INFR-2017-01-280299; PDCPN 2015–384). Author E. G. Villabona-Leal acknowledges to Dr. A. Marquez-Herrera for the hospitality during the post-doctoral fellowship in the Universidad de Guanajuato (PRODEP-SEP #511-6/2019.-13033/México) and to Coordinación de Ingeniería Química of COARA-UASLP by the access to Laboratory of Unit Operations to perform the experiments.
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Villabona-Leal, E.G., Escobar-Villanueva, A.G., Ovando-Medina, V.M. et al. Semiconducting polypyrrole@TiO2 pure anatase nanoparticles for photodegradation of reactive red 120 azo dye. J Mater Sci: Mater Electron 31, 12178–12190 (2020). https://doi.org/10.1007/s10854-020-03764-2
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DOI: https://doi.org/10.1007/s10854-020-03764-2