Restaji, Malik Fariksit (2027) Sintesis Nanopartikel Bleaching Earth (Bentonit) Dengan Metode Solgel. Undergraduate thesis, UPN Veteran Jawa Timur.
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Abstract
Bleaching earth based on bentonite is an important material in the oil refining process due to its ability to adsorb pigments, free fatty acids, and other impurities. However, the performance of natural bleaching earth is often limited by its large particle size and low surface area. This study aims to synthesize nanoparticle-based bleaching earth (synthetic bentonite) using the sol–gel method with sodium silicate solution, commonly known as waterglass (Na₂SiO₃), and aluminum sulfate (Al₂(SO₄)₃) as precursors. The synthesis process was carried out with variations in aging time (24–120 hours) and calcination temperature (400–800 °C) to determine the influence of these parameters on the chemical composition, morphology, particle size, and specific surface area of the final product. The results show that increasing the calcination temperature decreases moisture content and specific surface area while increasing particle size. Meanwhile, aging time has a complex effect on the levels of Si, Al, and O. The Si and Al contents tend to decrease when the aging time is excessively long at low temperatures due to the re-dissolution of active ions within the sol system. The best results were obtained at 24 hours of aging and a calcination temperature of 400 °C, yielding 31.5% Si, 8.07% Al, a particle size of 1.56 nm, and a specific surface area of 1544.42 m²/g. This composition meets the SNI 136336-2000 standard for bleaching earth. Adsorption tests on bulk cooking oil demonstrated the high effectiveness of the synthesized bleaching earth in decolorizing the oil, indicating its potential as an alternative material for oil purification. Overall, the sol–gel method proved effective in producing nanoscale synthetic bentonite with superior physical and chemical characteristics.
| 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: | Malik Fariksit Restaji | ||||||||
| Date Deposited: | 02 Dec 2025 07:33 | ||||||||
| Last Modified: | 02 Dec 2025 07:33 | ||||||||
| URI: | https://repository.upnjatim.ac.id/id/eprint/47204 |
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