@inproceedings{720e3378145c4f34a5eed79146b83890,
title = "Cd2+ and cr3+ cation immobilization by using geopolymer based on PT. IPMOMI fly ash",
abstract = "This study investigates the immobilization of Cd2+ and Cr3+ by using geopolymer based on PT. IPMOMI fly ash. The best composition of geopolymer paste was determined based on the highest magnitude of its 7 days compressive strength. Geopolymer paste were prepared by varying SiO2/Al2O3 and Na2O/SiO2 molar ratio of the starting materials. X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM) were employed to examined these compositions. The molar ratio of SiO2/Al2O3 was found to 6.46 produce the highest compressive strength of the resulting geopolymer namely 25 MPa and increased to 33.17 MPa by adjusting the ratio of Na2O/SiO2 to 0.65. Cd2+ and Cr3+ cations were added into geopolymer paste resin at the level of 1000 – 16000 ppm (mg/kg fly ash) and it was found to improve their compressive strength. The addition of 4000 ppm of Cd2+ increased the compressive strength to 38.6 MPa while the inclusion of 6800 ppm of Cr3+ reached 47.83 MPa. Further addition of cations reduced these values and the lowest compressive strength was observed on the addition of 16000 ppm of Cd2+ and Cr3+ namely 8.65 MPa and 4.39 MPa, respectively. Leaching test was conducted by using Inductively Coupled Plasma-Optical Emission Spectroscopy (ICP-OES) and the distribution of heavy metal cations were examined by using SEM-EDX. The results showed that geopolymer paste were able to immobilize Cr3+ at the studied level as there was no trace of Cr3+ detected after 6.5 hours of leaching. Geopolymer was also found to completely immobilize Cd2+ at the level of 1000 ppm albeit the addition of 16000 ppm results in 6.26% leached out of this cation.",
keywords = "Compressive strength, Fly ash, Geopolymer, Heavy metal, Immobilization, SEM-EDX, XRD",
author = "Hamzah Fansuri and Anisatun, {I{\textquoteright}Is M.} and Anif Fatmawati and Utomo, {Wahyu Prasetyo} and Warih Supriadi and Ridho Bayuaji and Subaer",
note = "Publisher Copyright: {\textcopyright} 2016 Trans Tech Publications, Switzerland.; 2nd Malaysia-Indonesia Geopolymer Symposium, 2015 ; Conference date: 25-10-2015 Through 27-10-2015",
year = "2016",
doi = "10.4028/www.scientific.net/MSF.841.186",
language = "English",
isbn = "9783038355441",
series = "Materials Science Forum",
publisher = "Trans Tech Publications Ltd",
pages = "186--192",
editor = "Ekaputri, {Januarti Jaya} and Ekaputri, {Januarti Jaya} and Antoni Antoni",
booktitle = "Properties and Application of Geopolymers",
}