Abstract
Mesoporous silica SBA-15 materials of high specific surface area (~700 m2 g?1) were synthesized by using block copolymer Pluronic P123 as template and tetraethoxysilane as silica source. The obtained materials were characterized by XRD, nitrogen adsorption - desorption measurements, SEM, EDS and AFM analysis. It was found that small modifications of synthesis conditions influenced the morphological features of the synthesized SBA-15 samples. The SEM analysis had shown that the SBA-15 synthesized at lower temperature and longer time of reaction (80?C, 48 h) provided elongated rod-shaped grains about 1?m long. The other sample synthesized at higher temperature and shorter time of reaction (100 ?C, 24 h) had rounded grains and grains of regular spherical shape with diameters ranging from 0.5 to 2 ?m. The EDS analysis confirmed that the particles of both synthesized samples were of the SiO2 content. In addition, the AFM analysis had shown different surface morphologies of the materials synthesized under various conditions.
Highlights
Since the mesoporous siliceous materials were synthesized [1,2,3,4,5], there has been an increasing interest in tailoring of these materials for potential applications in separation and adsorption processes, catalysis, etc
X-ray diffraction (XRD) pattern of the SBA-15/100 sample exhibits a very broad peak which is stronger in comparison to the sample SBA-15/80
According to the IUPAC classification [31], the isotherms for both synthesized materials are of type-IV and with a hysteresis loop associated with mesoporous materials
Summary
Since the mesoporous siliceous materials were synthesized [1,2,3,4,5], there has been an increasing interest in tailoring of these materials for potential applications in separation and adsorption processes, catalysis, etc. The SBA-15 can be synthesized in acidic environment from tetraethyl orthosilicate in the presence of amphiphilic poly (alkylene oxide)-type triblock copolymer, trade name Pluronic P123 [6, 7]. This amorphous material has large BET surface area with large pore diameter and thick pore walls [4]. Kokunešoski et al /Science of Sintering, 50 (2018) 111-121
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