Nitric-acid-activated biochars from agricultural wastes for methylene blue removal: characterization and pseudo-second-order adsorption kinetics. Vietnam Journal of Catalysis and Adsorption, [S. l.], v. 15, n. 3, p. 29–35, 2026. DOI: 10.62239/jca.2026.042. Disponível em: https://jca.edu.vn/index.php/jca/article/view/2026.042.. Acesso em: 14 oct. 2026.