The
Malaysian Journal of Analytical Sciences Vol 16 No 3 (2012): 247 – 255
RAPID SYNTHESIS AND CHARACTERIZATION OF NANOSODALITE
SYNTHESIZED USING RICE HUSK ASH
(Sintesis Cepat
dan Pencirian Nanosodalit yang Disintesis Menggunakan Abu Sekam Padi)
Siti Haslina Ahmad Rusmili¹, Leny Yuliati² and
Zainab Ramli1*
¹Department of
Chemistry, Faculty of Science,
²Ibnu Sina Institute for Fundamental
Science Studies,
Universiti Teknologi Malaysia,81310
Johor Bahru, Johor, Malaysia
*Corresponding author: zainab@kimia.fs.utm.my
Abstract
Rice
husk ash (RHA) which contains more than 90 percent silica is proven to be an
active silica source in zeolite synthesis. In this study, nanosodalite has been
successfully synthesized hydrothermally at 60⁰C using RHA as
silica source in alkaline medium at various crystallization times. Commercial
fumed silica was used as comparison for the silica source. Analysis by XRD has
shown that pure nanosodalite was formed in 3 hours and stable up to more than
24 hours when using RHA as silica source. On the other hand, fumed silica
produced pure nanosodalite only at 4 hours while a mixture of zeolites was
observed outside this time range. FESEM shows a worm-like morphology of
nanosodalite in the size range of 50-100 nm while FTIR shows the formation of
aluminosilicates bonds. Analysis on the dissolved silica in the gel reaction
mixture demonstrates the decreasing mass of silica after prolong time of
crystallization which indicates the consumption of the dissolved silica in
crystal growth of nanosodalite. This study shows that RHA is a better silica
source in stabilizing the nanosodalite phase in oxide gel reaction mixture as
compared to fumed silica.
Keywords: Rice husk ash , Commercial fumed silica,
Zeolite, Nanosodalite
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