The Effect of Pb Immobilization on Fly Ash Geopolymer Microstructure and Compressive Strength
Ufafa Anggarini* and Victor Purnomo
Department of Chemical Engineering, Universitas Internasional Semen Indonesia, Jln. Veteran Kompleks PT Semen Indonesia,
Gresik-East Java, INDONESIA
Fly-ash based geopolymer was synthesized with the influence of immobilized Pb as a heavy metal on its polymer chain formation. In this research, lead immobilization was successfully applied to geopolymer specimens at various ratios of Pb weight against fly ash weight between 0 - 0.5 %wt. This was proven by using XRD analysis whose diffractogram shows hump peak around 28-30º. FTIR analysis results show that Al-OSi bending vibration and Si-O-T asymmetric stretching mode are detected in geopolymers.
The highest compressive strength of lead-impregnated geopolymer was 69 MPa after 0.5%wt Pb immobilization in geopolymer. Pb was equally distributed to geopolymer surface after immobilization. Pb immobilization in geopolymer is recommended since the amount of Pb released to leachate after leaching was quite low.
Keywords: Geopolymer, immobilization, Pb ion, compressive strength, Pb distribution, leaching
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