Título:	Synthesis and Characterization of CaFe2O4: Catalytic and Bactericidal Evaluation at High Temperatures.
Autoria:	LOZANO, D. E. B. GUTIÉRREZ, M. A. P. MOREIRA, A. J. FERREIRA, V. M. MALAFATTI, J. O. D. PARIS, E. C. JOYA, M. R.
Afiliação:	UNIVERSIDAD NACIONAL DE COLOMBIA, CARRERA 30 CALLE 45-03; UNIVERSIDAD NACIONAL DE COLOMBIA, CARRERA 30 CALLE; SÃO PAULO STATE UNIVERSITY (UNESP), ARARAQUARA 14800-060, SP, BRAZIL; SÃO PAULO STATE UNIVERSITY (UNESP), ARARAQUARA 14800-060, SP, BRAZIL; ELAINE CRISTINA PARIS, CNPDIA; UNIVERSIDAD NACIONAL DE COLOMBIA, CARRERA 30 CALLE.
Ano de publicação:	2026
Referência:	Materials , v. 19, 1458, 2026.
Páginas:	24 p.
Conteúdo:	CaFe2O4 is a p-type ferrite semiconductor of interest for photo-assisted environmental remediation due to its narrow band gap and high chemical stability. In this work, CaFe2O4 powders were synthesized via the Pechini polymeric precursor method and calcined be tween 550 and 850 ◦C to investigate the influence of calcination temperature on structural order and material properties. X-ray diffraction combined with Rietveld refinement re vealed the progressive stabilization of the orthorhombic Pnma phase, accompanied by relaxation of the FeO6 octahedral framework. Raman and FT-IR spectroscopies confirmed a significant increase in vibrational coherence with increasing calcination temperature, quantified by a nearly three-fold increase in the global Raman order parameter and phonon lifetimes. Nitrogen physisorption showed a modest specific surface area and a pore sys tem dominated by interparticle meso–macroporosity, typical of thermally treated ferrites. Removal tests using ciprofloxacin under UV-A irradiation showed limited photo-assistedac tivity, while agar diffusion assays against Escherichia coli and Staphylococcus aureus revealed no inhibition halos, indicating the absence of detectable antibacterial activity under the experimental conditions employed. Overall, CaFe2O4 combines photo-assisted response with good structural stability, highlighting its potential as a chemically stable ceramic material with no detectable antibacterial activity under the tested conditions.
Palavras-chave:	CaFe2O4 Photo-assisted removal Pechini method Rietveld refinement Ciprofloxacin degradation Antibacterial assessment
Digital Object Identifier:	https://doi.org/10.3390/ma19071458
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CNPDIA)