Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.302
Publication date: 18th December 2023
Metal halide perovskites are arising a great interest of the scientific community because of their opto-electronic properties, as the high extinction coefficient, the low exciton binding energy, the excellent charge transport properties and optimal band gap in the visible range that make them good candidates for photocatalytic applications. Among the different perovskite materials, Cs3Bi2Br9 (CBB) is a particularly interesting lead-free halide perovskite that shows excellent stability and has already been used as a visible light-driven photocatalyst in dye degradation experiments. However, the understanding of the interaction between dyes and the CBB and the mechanism underlying the behavior of the CBB in the photocatalytic system still needs to be fully elucidated [1]. Here, the chemical co-precipitation method was successfully applied to synthesize CBB powder that was then used as photocatalyst for the dye degradation. XRD investigation showed that the prepared Cs3Bi2Br9 powder materials undergoes to structural evolution when exposed to different environment (water, isopropanol, air). Namely, we detected a systematic structural evolution of Cs3Bi2Br9 to the kinetically stable non-perovskite BiOBr phase. In addition, such a transformation was found faster in water, where the conversion in BiOBr was already complete within 24 hours, than in isopropanol and in ambient air [2]. On the basis of the proved CBB higher stability in isopropanol, such a solvent has been selected as reaction medium for the heterogenous photocatalytic experiments carried out monitoring the decoloration of structurally different azodyes, cationic Methylene Blue (MB) and anionic Methyl Orange (MO), at different concentration. Preliminarily, the adsorption of each dye on the CBB under dark condition has been spectroscopically monitored to clarify the interaction between dyes and CBB powder samples. Finally, the photocatalytic experiments have been performed monitoring the dyes decoloration as a function of the catalyst conversion of the Cs3Bi2Br9 in BiOBr, finally proving the beneficial effect of BiOBr in the degradation of both types of cationic MB and anionic MO dyes [3].
we acknowledge support from the Ministero Istruzione dell’Università e della Ricerca (MIUR) and the Università degli Studi di Bari Aldo Moro, Bari, Italy through the project "prin miur 2022 REVOLUTION cup:80002170720"
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