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ITS » Master Theses » Teknologi Proses - S2
Posted by dunia_zone@ymail.com at 29/06/2010 13:09:18  •  2177 Views


SINTESA PARTIKEL SILIKA BERPORI DARI WATER GLASS DENGAN METODE DUAL TEMPLATING SYSTEM

SYNTHESIS OF POROUS SILICA FROM WATERGLASS BY DUAL TEMPLATING SYSTEM

Author :
BALGIS, RATNA  ( 2307201011 )




ABSTRAK

Penelitian ini mengusulkan metode sintesa partikel silica dengan pori berukuran meso dari water glass dengan metode dual templating sistem. Gelatin dipakai untuk mengontrol pori -pori silica sedangkan polyethylene glycol untuk mengontrol morfologi partikel. Precursor silica dibuat dengan melarutkan water glass SiO 2Na2O 3.3 konsentrasi 26.84 wt. dengan rasio 110. Larutan water glass kemudian dilewatkan melalui resin ion exchanger H sehingga diperoleh asam silicic pH 2. Gelatin dan PEG dengan konsentrasi bervariasi antara 0.005 -0.02 gcm3 dilarutkan ke dalam laruan asam formiat 3 dan air secara berturut -turut. Kemudian larutan template ini ditambahkan ke dalam asam silicic yang sudah dipersiapkan sebelumnya. Campuran precursor ini kemudian ditambahkan ke dalam NH4OH agar terbentuk gel 1 dan diperam pada suhu ruang sel ama 18 jam. Kemudian dikeringkan dalam oven 80 C. Sample yang sudah kering diekstraksi dalam soxhlet menggunakan larutan asam formiat 5 dan larutan DMSO 5. Proses ini berlangsung selama 48 jam hingga warna kekuningan pada larutan dalam soxhlet hilang. Beberapa silica yang telah diekstraksi dikeringkan dalam oven pada suhu 100 C selama 12 jam dan sisanya dikalsinasi pada suhu 550 C selama 4 jam. Volume pori silica meningkat seiring dengan peningkatan konsentrasi template. PEG dapat dihilangkan dengan e kstraksi solvothermal menggunakan DMSO. Ini dapat dilihat dari IR-spectrumnya dimana menyerupai IR-spectrum silica tanpa template. Disisi lain gelatin tidak dapat diekstrak dengan baik dengan menggunakan metode yang sama hal ini dikarenakan pemecahan ik atan silikagelatin hybrid lebih sulit. Hal ini ditunjukkan dengan IR -spectrum dimana terjadi kombinasi antara peak gelatin dan silika. Oleh karena itu kalsinasi dipakai untuk mengatasi ini. Metode kombinasi untuk menghilangkan template kombinasi solvothermal extraction dan kalsinasi dapat menyebabkan karbonisasi gelatindan memecah silika-gelatin hybrid. Ini dapat dilihat dari IR-spectrumnya dimana tidak ada hybrid yang terdeteksi. Dalam penelitian ini ditemukan bahwa sample yang terkarbonisasi memiliki surface area yang lebih besar jika dibandingkan dengan sample tanpa karbonisasi. Misalnya sample dengan template gelatin 0.005 gcm3 dan PEG 0.015 gcm3 menghasilkan surface area sekitar 160.69 m2g ketika terjadi karbonisasi surface area meningkat hingg a 281.44 m2g.


ABSTRACT

In this work a method to synthesize mesoporous silica from water glass using dual templating system is proposed. Gelatin is used to control the silica porosity whereas polyethylene glycol is to control the particle morphology. The silica precursor was prepared by diluting water glass SiO 2Na2O 3.3 concentration 26.84 wt. with the rati o 110. The diluted water glass was then passed through ion exchange resin H to produce silicic acid pH 2. Gelatin and PEG with various concentrations from 0.005 -0.02 gcm3 was diluted ninto 3 aqueous formic acid and water respectively. Then it was a dded into the previously prepared silicic acid. This solution was mixed with NH 4OH to form gel and aged for about 18 hours. Then it was dried in the oven at a temperature of 80 C. The dried sample was then extracted in a Soxhlet using 5 aqueous formic and 5 aqueous DMSO. This process was done for about 48 hours until the yellow color of liquid in the Soxhlet disappeared. Some of the silica was dried in the oven at a temperature of 100 C for 12 hours and the other was calcined at a temperature of 550 C for about 4 hours. The pore volume of porous silica increases with the increase of template concentration. PEG can be removed from porous silica using Solvothermal extraction using DMSO. It can be seen from the IR -spectrum which is similar to IR-spectrum of silica without template. On the other hand gelatin can not be removed well using the same method because it is more difficult to crack silica - gelatin hybrid. It is confirmed by IR-spectrum which has combination peak between silica peak and gelatin. Therefore calcination was used to overcome this lack. Combination template removal combine solvothermal extraction with calcination can carbonize the gelatin and crack silica -gelatin hybrid. It can be seen from the IR spectrum that there are no hybrid detected. It is found that carbonized sample has higher surface area than original sample. For example sample prepared using 0.005 gcm3 gelatin template and 0.015 gcm3 PEG template obtain surface area about 160.69 m 2g when carbonization was occurred surface area increase to 281.44 m 2g. Keywords porous silica dual templating system



Keywordssilica berpori; dual templating system; gelatin; PEG
 
Subject:  Silica silikon berpori
Contributor
  1. Dr. Ir. Heru Setyawan, M. Eng.
Date Create: 29/06/2010
Type: Text
Format: pdf.
Language: Indonesian
Identifier: ITS-Master-3100010037440
Collection ID: 3100010037440
Call Number: RTK 661.068 3 Bal s


Source
Master Theses, Chimecal Engineering, RTK 661.068 3 Bal s, 2010

Rights
Copyright @2010 by ITS Library. This publication is protected by copyright and permission should be obtained from the ITS Library prior to any prohibited reproduction, storage in a retrievel system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to ITS Library




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  1.  ITS-Master-11818-2307201011-Abstract_En.pdf - 5 KB
  2.  ITS-Master-11818-2307201011-Conclusion.pdf - 5 KB




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