Interface matters: Design of an efficient CaCu3Ti4O12-rGO photocatalyst

• Autor(a) principal: Praxedes, F. M. [UNESP]
• Data de Publicação: 2022
• Outros Autores: Moreno, H. [UNESP], Simões, A. Z. [UNESP], Teixeira, V. C., Nunes, R. S. [UNESP], Amoresi, R. A.C. [UNESP], Ramirez, M. A. [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• DOI: 10.1016/j.powtec.2022.117478
• Texto Completo: http://dx.doi.org/10.1016/j.powtec.2022.117478; http://hdl.handle.net/11449/241842
• topic: CaCu3Ti4O12; Photocatalysis; Photoluminescence; rGO

Different strategies have been investigated to enhance optical properties of semiconductor oxides such as CaCu3Ti4O12, e.g., reduced graphene oxide. This research focuses on photoluminescent and photocatalytic properties of CaCu3Ti4O12-rGO composites. Micrometric CCTO and rGO particles were mixed to obtain composites. (Micro)structure, photoluminescence, and photocatalytic properties were evaluated. CCTO-rGO composites displayed broad PL emission over the visible spectrum, useful for triggering photocatalytic applications (≈ 380–750 nm). A shift in PL towards the violet region compared to pure CCTO along with an associated orange emission decrease may be ascribed to rGO activity as an electron donor/acceptor. Photocatalytic tests under UV light (325 nm) showed that 20%rGO (≈ 25.88%) significantly improved rhodamine B removal/adsorption compared to pure CCTO (≈ 9.64%). Results from this study show that CCTO-rGO composites may be a promising choice for future UV–visible light-driven photocatalytic devices with high adsorption/lower response time promoting sustainability in water purification methods and associated applications.