FLY ASH, KITOSAN, AND FOAMING AGENT BASED GEOPOLYMERS FOR IMMOBILIZATION OF CR6+ IONS WHICH CATEGORIZED AS TOXIC WASTE

• Main Author: Anugrah Pradana, M
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/39498
• Institution: Institut Teknologi Bandung

Indonesia has 21% of the water availability in the Asia Pacific region, but the availability of clean water is actually decreasing due to industrial wastes classified as Toxic and Hazardous Materials (B3), and one example is waste containing Cr6+ ions. A fly ash based geopolymers was developed with other mixture to reduce the ion content contained in B3 waste. Mixtures that are chosen are foaming agents, and kitosan. The experiment was run by casting fly ash based geopolymers and its mixture while making an artificial solution containing Cr6+ ions. The immersion testing of geopolymer samples in artificial solutions was done with variation of immersion time; 6, 12, and 18 hours. Several characterization methods such as FTIR, AAS, SEM, EDS-Mapping were used to see the morphology, composition, and concentration of the test results. By the characterization, geopolymer manufacturing process was successfully carried out. By the immersion test, it can be concluded that the immersion of the geopolymer sample makes the color of the solution change from orange to bright yellow in each variation of mixture and time. Then, AAS data showed that there was a reduction in Cr concentration in artificial solutions before and after immersion. It was found that FC samples (mixture of fly ash, foaming agent, and kitosan) which were immersed for 6 hours showed the highest Cr absorption of 13.95%.