Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.049
Publication date: 6th July 2018
In this work, we have synthesized and characterized a totally inorganic, lead-free and non-soluble in water perovskite with catalytic properties, demonstrated by the photodegradation of an organic dye as crystal violet used, for example, in textile industries. From characterization, XRD revealed the presence of cubic (Pm-3m) and tetragonal (I4/mcm) CsSnBr3 perovskite. The formation of the perovskite is supported by the Goldschmidt’s tolerance factor and octahedral factor calculations. From XPS, we have observed the presence of Sn2+, Sn4+ and the formation of non-stoichiometric tin oxide on the surface. UV-Vis spectroscopy showed high absorption of light in the visible range of the electromagnetic spectrum, with an optical band gap of 1.74 eV. Adsorption and photocatalysis tests have been performed under photovoltaic standard conditions (1 sun, AM1.5G solar spectrum and 25 ºC). The evolution of the system, followed by UV-Vis spectroscopy, showed a photodegradation of the dye in presence of the perovskite. A maximum of 73.1% of photodegradation of the crystal violet has been reached so the synthesized perovskite is, a priori, a suitable and eco-friendly material for removing dyes and other contaminants from the environment. A possible mechanism for the photocatalytic process has been proposed.
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