SINTESIS SILIKA AEROGEL DENGAN BAHAN DASAR ABU BAGASSE
| Main Authors: | Nazriati, Nazriati, Setyawan, Heru, Winardi, Sugeng, Arizanova, Reza, Eka V, Enggar |
|---|---|
| Format: | Article info application/pdf eJournal |
| Bahasa: | eng |
| Terbitan: |
Dept. of Chemical Engineering, Diponegoro University
, 2011
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| Subjects: | |
| Online Access: |
http://ejournal.undip.ac.id/index.php/reaktor/article/view/3586 http://ejournal.undip.ac.id/index.php/reaktor/article/view/3586/3223 |
Daftar Isi:
- SYNTHESIS OF SILICA AEROGEL FROM BAGASSE ASH. Synthesis of silica aerogel from bagasse ash was done by alkaline extraction followed by sol-gel. Bagasse ash was extracted with NaOH at its boiling temperature for one hour with continue stirring, to produce sodium silicate. Subsequently, sodium silicate was pass through ionic exchanger resin, to produces silicic acid (SA). Silicic acid solution was then added with TMCS and HMDS as surface modifier agent. In order to form gel pH must be adjusted to final pH of 8-9 by addition of NH4OH solution. The resulting gel then was aged and dried at ambient pressure and at a certain time and temperature. Characterization of products was done by measuring its pore volume, surface area, and hydrophobisity (contact angle). TMCS serves as water expeller from the pores and subsequently surface was modified by HMDS and TMCS. HMDS content will linearly increase surface area, pore volume, and the contact angle of the resulting silica aerogel. Characteristics of silica aerogel was generated by varying the composition of the SA:TMCS:HMDS resulting has a surface area of 50-488 m2/g, pore volume from 0.2 to 0.9 m3 /g, the contact angle of 48-119 and pore diameter ranging from 5.7-22.56 nm. Based on the resulting pore diameter, the synthesized of silica aerogel categorized as mesoporous. Abstrak Sintesis silika aerogel dari bahan dasar abu bagasse dilakukan dengan ekstraksi basa dan diikuti dengan sol-gel. Abu bagasse diekstrak dengan NaOH pada suhu didihnya sambil diaduk selama satu jam, menghasilkan sodium silikat. Selanjutnya, sodium silikat dilewatkan resin penukar ion, menghasilkan asam silicic (SA). Larutan asam silicic kemudian ditambahkan trimethylchlorosilane (TMCS) dan hexamethyldisilazane (HMDS) sebagai agen pemodifikasi permukaan. Untuk terjadinya gel pH diatur hingga mencapai 8-9 dengan penambahan larutan NH4OH. Gel yang dihasilkan kemudian di-aging dan dikeringkan pada tekanan ambien pada suhu dan waktu tertentu. Karakterisasi produk dilakukan dengan pengukuran volume pori, surface area, dan hidrofobisitasnya (sudut kontak). TMCS berfungsi untuk mengusir air dari pori dan selanjutnya permukaan silika dimodifikasi oleh HMDS dan juga oleh TMCS. Semakin besar kandungan HMDS semakin besar luas permukaan, volume pori, dan sudut kontak silika aerogel yang dihasilkan. Karakteristik silika aerogel yang dihasilkan dengan memvariasikan komposisi SA:TMCS:HMDS memiliki luas permukaan antara 50-488 m2/g, volume pori 0,2-0,9 m3/g, sudut kontak 48-119 dan diameter pori berkisar antara 5,7-22,56 nm. Berdasarkan diameter pori yang dihasilkan, silika aerogel hasil sintesis termasuk mesopori.