Preparation of iron catalysts supported in biomass arising from the coconut green shell for the falling of methylene blue. Int. J. Geosci., Eng. Technol. [Internet]. 30 de abril de 2021 [citado 7 de mayo de 2026];3(1):1-5. Disponible en: https://revistas.ufvjm.edu.br/index.php/ijget/article/view/427