Nguyen, K., My, Q. N. V., Kim, A. P. T., Tran, P. T., Huynh, D., & Le, O. (2022). Coal fly ash-slag and slag-based geopolymer as an absorbent for the removal of methylene blue in wastewater. Science and Technology Development Journal, 25(1), 2215-2223. https://doi.org/https://doi.org/10.32508/stdj.v25i1.3421