Bio-based activated carbon from coffee husk for efficient removal of Fe³⁺ and Cu²⁺ ions from water. Vietnam Journal of Catalysis and Adsorption, [S. l.], v. 15, n. 1, p. 23–28, 2026. DOI: 10.62239/jca.2026.003. Disponível em: https://jca.edu.vn/index.php/jca/article/view/2026.003.. Acesso em: 3 apr. 2026.