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Influence of the Silica-to-Surfactant Ratio and the pH of Synthesis on the Characteristics of Mesoporous SBA-15

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Author(s): Ahmad Zuhairi Abdullah | Noraini Razali | Keat Teong Lee

Journal: Journal of Physical Science
ISSN 1675-3402

Volume: 21;
Issue: 2;
Start page: 13;
Date: 2010;
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Keywords: mesoporous | SBA-15 | TEOS/TCP ratio | pH | characteristics

ABSTRACT
Mesoporous silica SBA-15 was synthesised with two different sets of synthesis conditions and was characterised using nitrogen adsorption, X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The effects of the ratio of tetraethylorthosilicate/triblockcopolymer (TEOS/TCP) (1.52–3.38) and pH (1.3–3.0) were particularly studied. Well-ordered hexagonal mesoporous silicas were formed at a TEOS/TCP ratio of 2.25 and a pH above 2. The highest surface area and an intense XRD pattern were shown by those synthesised at a ratio of 1.52 (669 m2/g and 0.5 cc/g). A high TEOS amount disturbed the condensation of the silica network, causing failure in the formation of the Si-O-Si network.
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