Abstract
Geopolymer as a water absorbent material has been synthesized from fly ash. This research aims to determine the ability of geopolymer to save water content with variations of NaOH molar ratio. In this research, the synthesis of geopolymer was conducted by setting NaOH molar ratio at 3, 4, 5, 6 and 7 M. The resulting material characterization was done by using XRD, FTIR and SEM in order to characterize the geopolymer structures. Water absorption capacity was measured by immersing the geopolymer specimens in water for 24 hours. The results show that the optimum molar ratio of NaOH was 3 M, which water absorption capacity was 11.10%wt.
Highlights
Porous material of ceramic is a potential material to be used as an absorbent[1]
The product was characterized by X-Ray Diffraction (XRD), Fourier Transform Infrared (FTIR) and Scanning Electron Microscopy (SEM)
As the starting material, was mixed with alkali solution, KCl salt was added into geopolymer paste
Summary
Porous material of ceramic is a potential material to be used as an absorbent (water absorber)[1]. Porous ceramics prepared from clay minerals show high water adsorption capacity, high adsorption rate and slow water release rate due to their unique microporous structure [2]. Another new advantage of using porous ceramics is that such material is produced environmentally friendly without the need for combustion processes at high temperatures. Synthesis of geopolymer is generally carried out by reacting an alkali silicate solution with a solid aluminosilicate such as metakaolin, fly ash and so forth under alkaline conditions. Geopolymer was synthesized by using fly ash as a base material and alkaline solution and sodium silicate as additional materials. The measurement of maximum water absorption capacity was conducted by immersing the samples of geopolymer in distilled water for 24 hours
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