Pengaruh Variasi Berat Cethyltrimethylammonium Bromide (CTAB) Terhadap Sintesis silika Mesopori Dari Ekstrak Pasir Bangka

Gusedy, Mira Shelvia Putri (2025) Pengaruh Variasi Berat Cethyltrimethylammonium Bromide (CTAB) Terhadap Sintesis silika Mesopori Dari Ekstrak Pasir Bangka. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Material mesopori telah menjadi fokus penelitian dalam beberapa dekade terakhir karena luas permukaannya yang tinggi, ukuran pori yang dapat dikontrol, dan struktur yang sangat teratur. Namun, pada penelitian ini ditemukan bahwa luas permukaan spesifik yang dihasilkan justru relatif rendah dibandingkan ekspektasi umum terhadap material mesopori. Ekstraksi dilakukan melalui proses pencucian asam dan pelarutan basa, kemudian dilanjutkan dengan sintesis surfaktan CTAB sebesar 3 gram, 4,5 gram, dan 6 gram. Surfaktan CTAB digunakan sebagai agen pembentuk pori melalui pendekatan soft-templating. Karakterisasi dilakukan menggunakan XRD, DTA-TGA, BET dan FE-SEM. Pola XRD menunjukkan fasa silika amorf ditandai adanya punuk di rentang 2θ 21–25° dengan struktur yang lebih teratur setelah kalsinasi. Namun, puncaknya tertutupi oleh fasa kristalin NaCl yang terbentuk pada proses titrasi filtrat selama sintesis. Analisis DTA-TGA menunjukkan dekomposisi CTAB selesai sebelum 550 °C. Analisis BET menunjukkan perbedaan karakteristik pori, ketiga variasi menunjukkan isotherm tipe IV. Variasi 3 gram memiliki luas permukaan tertinggi sebesar 8.967 m²/g, volume pori 0,043 cm³/g, dan diameter pori 3.39 nm dengan histeresis H1. Variasi 4,5 gram menghasilkan volume pori terbesar sebesar 0,060 cm³/g dan diameter pori 31.37 nm, namun luas permukaan menurun menjadi 7.471 m²/g, histeresis tetap H1. Pada variasi 6 gram, luas permukaan dan volume pori terendah yaitu 6.033 m²/g dan 0,011 cm³/g, diameter pori 3,04 nm, serta histeresis berubah menjadi H2. Citra FE-SEM menunjukkan struktur berpori cukup seragam untuk variasi CTAB 3 gram, sedangkan variasi CTAB 6 gram kurang seragam.
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Mesoporous materials have been the focus of research in recent decades due to their high surface area, controllable pore size, and highly ordered structure. However, this study found that the specific surface area produced was relatively low compared to general expectations for mesoporous materials. Extraction was carried out through acid washing and base dissolution processes, followed by the synthesis of CTAB surfactant of 3 grams, 4.5 grams, and 6 grams. CTAB surfactant was used as a pore-forming agent through a soft-templating approach. Characterization was carried out using XRD, DTA-TGA, BET and FE-SEM. The XRD pattern indicates the presence of amorphous silica, as evidenced by a broad hump in the 2θ range of 21–25°, with a more ordered structure observed after calcination. However, the peak is obscured by the crystalline NaCl phase formed during the filtrate titration step of the synthesis process. DTA-TGA analysis showed that CTAB decomposition was complete before 550 °C. BET analysis showed differences in pore characteristics, all three variations exhibited type IV isotherms. The 3 gram variation has the highest surface area of 8.967 m²/g, pore volume of 0.043 cm³/g, and pore diameter of 3.39 nm with hysteresis H1. The 4.5 gram variation produces the largest pore volume of 0.060 cm³/g and pore diameter of 31.37 nm, but the surface area decreases to 7.471 m²/g, the hysteresis remains H1. In the 6 gram variation, the lowest surface area and pore volume are 6.033 m²/g and 0.011 cm³/g, the pore diameter is 3.04 nm, and the hysteresis changes to H2. The FE-SEM image shows a less uniform porous structure.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Cetyltrimethylammonia Bromide (CTAB), Mesoporous Sillica, Synthesis SiO2, Cetyltrimethylammonia Bromide (CTAB), Silika Mesoporous, Sintesis SiO2.
Subjects:	Q Science > QC Physics > QC585.75.S55 Silica Q Science > QD Chemistry > QD117 Absorption
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45201-(S1) Undergraduate Thesis
Depositing User:	Mira Shelvia Putri Gusedy
Date Deposited:	31 Jul 2025 08:40
Last Modified:	31 Jul 2025 08:40
URI:	http://repository.its.ac.id/id/eprint/124222

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