indahsari, Kharisma (2025) Sintesa Pupuk Cair Amonium Silikat Dari Sekam Padi Dengan Metode Ekstraksi. Undergraduate thesis, UPN Veteran Jawa Timur.
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Abstract
Silica-containing solid waste, such as rice husk ash, is a resource with high potential for use as a raw material in the synthesis of liquid ammonium silicate fertilizer. The high silicate content in rice husk ash is known to provide agronomic benefits, particularly in increasing plant resistance to abiotic stresses such as drought and pathogen attack. In this study, liquid ammonium silicate was synthesized through the dissolution of silica from rice husk ash using ammonium hydroxide (NH₄OH) solutions at varying concentrations (1, 1.25, 1.5, 1.75, and 2) M. The dissolution process took place at 90°C for (60, 75, 90, 105, and 120) minutes to produce a sodium silicate solution. The ratio of rice husk ash to NH₄OH solution used in the synthesis process was 1:12.5, which was chosen to ensure optimal silica solubility and high reaction efficiency. The resulting liquid ammonium silicate fertilizer was then tested for nitrogen and silicate content, and characterized to determine the functional groups present in the solution. The best results were obtained at a NH₄OH concentration of 2 M, with a reaction time of 75 minutes, and a silica content of 0.24%. Furthermore, the best nitrogen content was achieved at a NH₄OH concentration of 2 M, with a reaction time of 60 minutes, and a nitrogen content of 4.57%. These results indicate that liquid ammonium silicate fertilizer from rice husk ash can be synthesized and has the potential to be used as a source of silicon nutrients for plants. Additional characterization was performed using an FTIR spectrophotometer to identify functional groups. The results showed a peak wavelength at 1039.63 cm⁻¹, representing the Si–O–Si group, indicating the presence of silica in the liquid fertilizer, and a peak at 3446.79 cm⁻¹, representing the –NH group, indicating the presence of ammonium ions in the liquid fertilizer structure. Keywords: ammonium silicate; liquid fertilizer; silica; rice husk waste
| Item Type: | Thesis (Undergraduate) | ||||||||
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| Subjects: | T Technology > TP Chemical technology > TP155 Chemical engineering | ||||||||
| Divisions: | Faculty of Engineering > Departement of Chemical Engineering | ||||||||
| Depositing User: | Kharisma Indahsari | ||||||||
| Date Deposited: | 29 May 2026 08:01 | ||||||||
| Last Modified: | 29 May 2026 08:02 | ||||||||
| URI: | https://repository.upnjatim.ac.id/id/eprint/53041 |
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