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]. 30º de abril de 2021 [citado 30º de abril de 2026];3(1):1-5. Disponível em: https://revistas.apps-teste.ufvjm.edu.br/ijget/article/view/427