Preparation of biodiesel from used frying oil using strontium oxide catalyst loaded with 15% nanoactivated carbon. Samarra Journal of Pure and Applied Science, [S. l.], v. 6, n. 2, p. 62–77, 2024. DOI: 10.54153/sjpas.2024.v6i2.612. Disponível em: https://sjpas.com/index.php/sjpas/article/view/612. Acesso em: 19 apr. 2026.