Pyrolysis method of gel SiO2/chitosan for the preparation amorphous silica nanoparticles from waste rice husk ash . Vietnam Journal of Catalysis and Adsorption, [S. l.], v. 10, n. 1S, p. 87–91, 2022. DOI: 10.51316/jca.2021.097. Disponível em: https://jca.edu.vn/index.php/jca/article/view/2021.097.. Acesso em: 31 jul. 2025.