“Investigation of the Ni(II) Adsorption Isotherm onto Biochar Derived from Cassava Stem”. Vietnam Journal of Catalysis and Adsorption 14, no. 4 (December 30, 2025): 31–36. Accessed July 27, 2026. https://jca.edu.vn/index.php/jca/article/view/2025.059.