Firmansyah, Reyhan (2026) LAPORAN HASIL PENELITIAN SINTESIS KOMPOSIT BIOAKTIF CaO-SiO2-K2O-P2O5 MELALUI METODE PRESIPITASI BERBASIS LIMBAH KALSIUM KARBIT DAN SEKAM PADI. Undergraduate thesis, UPN Veteran Jawa Timur.
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Abstract
**Abstract** The utilization of industrial and agricultural waste as value-added raw materials is one of the approaches to support sustainable waste management. This study aimed to synthesize a bioactive CaO–SiO₂–K₂O–P₂O₅ composite from calcium carbide waste and rice husk ash using the precipitation method. Calcium carbide waste was utilized as the calcium source, while rice husk ash served as the silica source. The precipitation process was carried out by varying the pH at 7, 8, 9, 10, and 11, while the calcination temperature was varied at 600, 700, 800, 900, and 1000°C. The synthesized products were characterized using X-ray fluorescence (XRF) to determine their oxide composition, and the product yield was subsequently calculated. The results demonstrated that the CaO–SiO₂–K₂O–P₂O₅ composite was successfully synthesized, and both the precipitation pH and calcination temperature significantly influenced the product composition and yield. Increasing the precipitation pH tended to increase the CaO content, whereas the SiO₂ content decreased under alkaline conditions. The K₂O and P₂O₅ contents exhibited relatively insignificant changes with variations in pH. Meanwhile, increasing the calcination temperature resulted in a tendency for higher SiO₂ content, lower CaO content, and only slight changes in the K₂O and P₂O₅ contents. The product yield was also affected by both process variables, ranging from 142% to 168%. The synthesized composite did not meet the standard composition of 45S5-K bioactive glass for biomedical applications, namely 26.9 mol% CaO, 46.1 mol% SiO₂, 24.4 mol% K₂O, and 2.6 mol% P₂O₅. However, due to the predominance of CaO and P₂O₅ in the synthesized material, it shows potential for application as a fertilizer or soil amendment. This study demonstrates that calcium carbide waste and rice husk ash have promising potential as value-added raw materials for composite production, although further optimization of the synthesis method is required to achieve a composition suitable for biomaterial applications.
| Item Type: | Thesis (Undergraduate) | ||||||||
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| Subjects: | Q Science > QD Chemistry | ||||||||
| Divisions: | Faculty of Engineering > Departement of Chemical Engineering | ||||||||
| Depositing User: | Reyhan Firmansyah | ||||||||
| Date Deposited: | 23 Jul 2026 08:47 | ||||||||
| Last Modified: | 23 Jul 2026 08:47 | ||||||||
| URI: | https://repository.upnjatim.ac.id/id/eprint/57449 |
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