Margareta, Winny and Tedjorahardjo, Vincent Winata (2017) Sintesis Aerogel Silika Dengan Metode Freeze Drying. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Penelitian ini bertujuan untuk mempelajari pembuatan silika aerogel berbahan dasar water glass dengan metode freeze drying, serta mengetahui pengaruh pH, konsentrasi, serta jenis katalis organik terhadap karakteristik silika aerogel yang dihasilkan. Metode yang digunakan pada sintesa ini adalah metode fisika-kimia dengan pemanasan, pendinginan dan penambahan bahan kimia yaitu asam organik atau basa organik.
Pada penelitian terhadap pengaruh pH dan jenis katalis, Water glass komersial diencerkan kedalam aquades dengan perbandingan 1:10. Larutan sodium silikat dititrasi menggunakan katalis asam organik (Asam Sitrat, Asam Oksalat) dengan range pH 7-9, serta katalis basa organik (Resin Kationik + Ammonium Hidroksida) dengan range pH 4-5. Larutan kemudian di aging selama 18 jam sehingga terbentuk hydrogel silika. Sampel hydrogel dikeringkan dengan metode freeze drying hingga didapatkan aerogel silika. Sampel aerogel yang dihasilkan dicuci dengan aquades lalu dikeringkan untuk mendapatkan aerogel silika yang lebih murni.
Pada penelitian terhadap pengaruh konsentrasi water glass, Water glass komersial diencerkan kedalam aquades dengan variabel perbandingan 1:5, 1:7.5, dan 1:10. Larutan sodium silikat dititrasi menggunakan katalis basa organik (Resin Kationik + Ammonium Hidroksida) dengan range pH 4. Larutan kemudian di aging selama 18 jam sehingga terbentuk hydrogel silika. Sampel hydrogel dikeringkan dengan metode freeze drying hingga didapatkan aerogel silika. Sampel aerogel yang dihasilkan dicuci dengan aquades lalu dikeringkan untuk mendapatkan aerogel silika yang lebih murni.
Sampel aerogel yang dihasilkan dikarakterisasi menggunakan alat BET (Brunauer- Emmet-Teller), dan SEM (Scanning Electron Microscope).
Dari hasil penelitian pengaruh karakteristik aerogel silika terhadap pengaruh pH dan jenis katalis, maka didapatkan bahwa range luas permukaan yang didapatkan berkisar pada 79~539 m2/g, dengan range volume pori sebesar 0,01~0,33 cm3/g, dan diameter pori sebesar 3,4~10,4 nm.
Dari hasil penelitian pengaruh karakteristik aerogel silika terhadap pengaruh konsentrasi water glass, maka didapatkan bahwa range luas permukaan yang didapatkan berkisar pada 294~539 m2/g, dengan range volume pori sebesar 0,15~0,25 cm3/g. dan diameter pori sebesar 3,4~4,3 nm.
Dari penelitian ini, dapat disimpulkan bahwa karakteristik silika aerogel terbaik didapatkan pada katalis Basa Organik (Resin Kationik + Amonium Hidroksida) pada pH 4 dengan luas permukaan 539 m2/g, volume pori 0,25 cm3/g, dan diameter pori 3,4 nm (mesopori).
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This research aims to study
the synthesis of water glass
-
based aerogel silica using freeze drying method, and to know the
effect of pH, concentration, and type of organic catalyst on the
resulting silica aerogel characteristics. The method used in this
synthesis is a physico
-
chemical
method with heating, cooling and
addition of chemicals, namely organic acids or organic bases.
The research of the effect of pH and catalyst type,
commercial water glass was diluted into aquadest at a ratio of 1:10.
The sodium silicate solution was titrat
ed using an organic acid
catalyst (Citric Acid, Oxalic Acid) with a pH range of 7
-
9, as well
as an organic base catalyst (Cationic Resin + Ammonium
Hydroxide) with a pH range of 4
-
5. The solution was then aged for
18 hours to form silica hydrogel. Hydrogel
samples were dried by
freeze drying method until silica aerogel was obtained. The
resulting aerogel sample was washed with aquadest then dried to
obtain more pure silica aerogel.
The research of the effect of water glass concentration,
commercial water gl
ass was diluted into aquadest with variables of
1: 5, 1: 7.5, and 1:10. The sodium silicate solution was titrated
using an organic base catalyst (Cationic Resin + Ammonium
Hydroxide) with a pH range of 4. The solution was then aged for
18 hours to form sil
ica hydrogel. Hydrogel samples were dried by iv
freeze drying method until silica aerogel was obtained. The
resulting aerogel sample was washed with aquadest then dried to
obtain more pure silica aerogel.
The resulting aerogel samples were characterized using
a
BET (Brunauer
-
Emmet
-
Teller) tool, and SEM (Scanning Electron
Microscope).
From the result of the research, the effect of silica aerogel
characteristic to the effect of pH and catalyst type, it was found that
the surface area obtained ranged from 79 ~ 53
9 m2 / g, with pore
volume ranged from 0.01 ~ 0.33 cm3 / g, and pore diameter of 3.4
~ 10.4 nm.
From the result of the research, the effect of silica aerogel
characteristic to the influence of water glass concentration, it is
found that the surface area ob
tained ranged from 294 ~ 539 m2 / g,
with pore volume range 0,15 ~ 0,25 cm3 / g, and pore diameter of
3.4 ~ 4.3 nm.
From this research, it can be concluded that the best
aerogel silica characteristics are obtained from organic base
catalyst (Resin Cationic
+ Ammonium Hydroxide) at pH 4 with
surface area 539 m2 / g, pore volume 0.25 cm3 / g, and pore
diameter of 3.4 nm (mesopore).
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | Water glass, Aerogel Silika, Freeze Drying |
| Subjects: | T Technology > TP Chemical technology > TP248 Nanogels. Nanoparticles. |
| Divisions: | Faculty of Industrial Technology > Chemical Engineering > 24201-(S1) Undergraduate Thesis |
| Depositing User: | Winny Margareta . |
| Date Deposited: | 28 Sep 2017 07:45 |
| Last Modified: | 06 Mar 2019 03:49 |
| URI: | http://repository.its.ac.id/id/eprint/44285 |
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