Rendy Muhamad Iqbal, Warih Supriadi, R.Y. Perry Burhan, Silvana Dwi Nurherdiana, Ririn Eva Hidayati, Subaer, Ridho Bayuaji, Hamzah Fansuri
In this study, the geopolymer from fly ash as based-raw material has been examined on the ability of immobilization of several heavy metal ions. The fly ash analyzed for its physical and chemical properties. Fly ash and heavy metals were then mixed with an activator base until being homogeneous prior to be cast into a cylindrical mold following ASTM C 39-86 and left for 7 days. Subsequently, the geopolymer was characterized by SEM, FTIR, XRD, compressive strength test and toxicity characteristic leaching procedure (TCLP). The diffractogram of fly ash exhibited the existence of mullite, alumina and iron oxide phase, which were suitable with XRF result. From FTIR spectra, the vibration on finger print area appeared indicating the vibration of T-O-T from geopolymer network. The observation revealed that the addition of Pb2+ cations caused microcracking from SEM image and affected the compressive strength of the geopolymer. Sr2+ was an ion that was very easily leached compared to other three ions, and it caused a weak interaction between Sr2+ and geopolymer network. The higher amount of metal ions into the geopolymer network reduced the compressive strength of geopolymer. Sr2+-geopolymer had a lower compressive strength compared to Pb2+, Cd2+, and Co2+ © 2022 KIPMI.
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Palangka Raya, Palangkaraya, 73111, Indonesia; Division of Natural and Applied Science, Center for Development of Science, Technology, and Peat Innovation, Universitas Palangka Raya, Palangkaraya, 73111, Indonesia; Department of Chemistry, Faculty of Science and Data Analytics, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia; Politeknik Energi dan Mineral Akamigas, Blora, 58315, Indonesia; Department of Chemical Engineering, Faculty of Engineering, Universitas Pembangunan Nasional Veteran East Java, Surabaya, 60294, Indonesia; Department of Physics, Faculty of Mathematics and Natural Science, Universitas Negeri Makassar, Makassar, 90000, Indonesia; Department of Civil Infrastructure Engineering, Faculty of Vocation, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia
