BUI THUONG, Huyen et al. Removal of methylene blue from aqueous solution by biochar derived from rice husk. <b>Vietnam Journal of Earth Sciences</b>, <i>[S. l.]</i>, v. 44, n. 2, p. 273–285, 2022. DOI: 10.15625/2615-9783/16998. Disponível em: http://vjes.vast.vn/jse/article/view/16998. Acesso em: 8 nov. 2025.