Hamid, Syarwan, et al. “Activated Carbon from Sawdust Biomass Via ZnCl₂ and NaOH Activation for Water Biofiltration Applications”. Journal of Green Chemical and Environmental Engineering, vol. 1, no. 4, Dec. 2025, pp. 221-33, https://doi.org/10.63288/jgcee.v1i4.18.