Ahmad Daud, N. A. ., M. R. Shamsuddin, S. Ayu Pradanawati, and N. E. Rabat. “Preparation, characterization and performance evaluation of fly ash-based composite geopolymer membranes for methylene blue dye removal”. Science, Engineering and Health Studies, vol. 15, Dec. 2021, p. 21020011, doi:10.14456/sehs.2021.38.