Abstract
Geopolymer has been synthesized from fly ash to be applicated as water absorbent material. This research conducted to determine the ability of geopolymer to abrsop water by variation of solid – liquid ratio at optimum molarity of NaOH; 3 M. In this research, the synthesis of geopolymer was conducted at the variation of solid-liquid ratio; 60:40, 65:35, 70:30, and 75:25. Result of the treatment were characterized by XRD and SEM to compare the geopolymer structure. Water absorption capacity was measured by immersing the geopolymer specimens in water for 24 hours. Based on the result, solid – liquid ratio with maximum water absorbed was 70:30 with 13,04 wt%.
Highlights
Urban farming is an activity utilizing the open space that is not productive into an open space that is productive in quality and quantity
Porous ceramics prepared from clay minerals indicate the adsorption capacity of the high water, high adsorption rate and slow water release rate associated with their unique microporous structure in the material [2, 3]
The synthesis of geopolymer was conducted at the variation of solid-liquid ratio; 60:40, 65:35, 70:30, and 75:25 at optimum molarity of NaOH; 3 M .Fly ash, as the starting material, was mixed with alkali solution, KCl salt was added into geopolymer paste
Summary
Urban farming is an activity utilizing the open space that is not productive (vacant land and green land) into an open space that is productive in quality and quantity. Planting medium is essential if urban farming is done in a narrow open space, with the right media plants can grow well. Ceramic based porous material is one type of material that has the potential to be used as water absorbent. Water-absorbing material is especially useful as a planting medium in the narrow land or areas with limited land. Porous ceramics prepared from clay minerals indicate the adsorption capacity of the high water, high adsorption rate and slow water release rate associated with their unique microporous structure in the material [2, 3]
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