NGUYEN, Lan Huong et al. Removal of chromium from wastewater using paper waste sludge-derived hyrdrochar modified by naoh. <b>Vietnam Journal of Earth Sciences</b>, <i>[S. l.]</i>, v. 43, n. 1, p. 71–80, 2020. DOI: 10.15625/0866-7187/15704. Disponível em: http://vjes.vast.vn/jse/article/view/15704. Acesso em: 9 nov. 2025.