We read with great interest the paper by Xie et al. (2024) that describes the methodology for recycling and reusing microplastics, MPs, by utilizing it into the geopolymer, GP, matrix made from fly ash, FA, and ground granulated blast furnace slag, GGBFS. The GP was created by activating the FA and GGBFS (7:3 ratio) using 16 M NaOH. Herein the MPs of various sizes (viz. 50, 150, and 500 µm) and varying percentages (viz. 2.5, 5, 7.5, and 10) were encapsulated in the GP matrix and further, they were cured at 40 and 80