Abdullah, Affan (2025) The Effect of Cetyltrimethylammonium Bromide (CTAB) Surfactant Moles and Hydrochloric Acid (HCl) Concentration on the Synthesis of Al-MCM-41. Undergraduate thesis, UPN "VETERAN" JAWA TIMUR.
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Abstract
This research was conducted to synthesize Al-MCM-41 material, a mesoporous silica modified with aluminum, using kaolin from Bangka Belitung as the main source of silica and alumina. Kaolin was chosen because it contains approximately 61% SiO₂ and 31% Al₂O₃, allowing the production of Al-MCM-41 without the need for additional silica compounds or synthetic alumina. The main objective of this study is to evaluate the effect of varying moles of the surfactant Cetyl Trimethyl Ammonium Bromide (CTAB) and hydrochloric acid (HCl) concentration on pore structure, surface area, and the SiO₂/Al₂O₃ ratio of the resulting product. The synthesis method was carried out in two main stages: the sol-gel process and hydrothermal treatment. First, kaolin was calcined into metakaolin at 750°C for 1 hour, followed by a dealumination process using HCl solution with concentrations ranging from 2M to 6M. The dealuminated metakaolin was then mixed with CTAB in various molar amounts (0.005 to 0.025 mol) and NaOH solution, then heated in an autoclave at 100°C for 24 hours to form a mesoporous structure. The final steps involved drying and calcining at 550°C to remove the surfactant and maintain the pore structure in the material. The research results showed that an HCl concentration of 6M produced a SiO₂/Al₂O₃ molar ratio of 25.359, which approaches the ratio found in commercial Al-MCM-41 products. Meanwhile, the use of 0.025 mol CTAB gave the best results with a surface area of 601.775 m²/g, a pore volume of 0.541 cc/g, and a pore diameter of 3.59 nm. Characterization using XRD, XRF, SEM, and BET demonstrated that the combination of 6M HCl and 0.025 mol CTAB produced Al-MCM-41 with a good mesoporous structure and characteristics close to the standard product. Thus, this study proves that local kaolin from Bangka Belitung with high silica and alumina content can be used as a raw material for the synthesis of catalytic and adsorbent materials such as Al-MCM-41.
| Item Type: | Thesis (Undergraduate) | ||||||||||||
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| Subjects: | T Technology > TP Chemical technology > TP155 Chemical engineering | ||||||||||||
| Depositing User: | Affan Zein Abdullah | ||||||||||||
| Date Deposited: | 28 Jul 2025 07:44 | ||||||||||||
| Last Modified: | 28 Jul 2025 07:44 | ||||||||||||
| URI: | https://repository.upnjatim.ac.id/id/eprint/41286 |
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