2.2. Preparation of amine-functionalized SBA-15
The amino-containing SBA-15 mesoporous substrates were synthesized
using as source of amino groups, 3-aminopropyl-triethoxysilane
(APTES: NH2(CH2)3Si(OEt)3; 99%; Aldrich) in ethanol
(absolute, Sigma–Aldrich) [39]. Each organic–inorganic hybrid
material was prepared in unequal concentration solutions of APTES
to obtain samples with the following TEOS:APTES molar compositions:
1:0.2, 1:0.3, and 1:0.4. The NH2-containing samples are
coded hereafter as SBA15–0.2NH2, SBA15–0.3NH2 and SBA15–
0.4NH2. The concentration of APTES corresponded to the theoretically
necessary concentration of APTES already mentioned. One
gram of SBA-15 was dispersed into APTES-ethanol solution at room
temperature in an inert atmosphere for 30 min. Then, deionized
water was slowly added and the liquid suspension was stirred
for 30 min. Water was incorporated in order to perform hydrolysis
of the alkoxide groups of APTES. The amount of water added was
twice the amount required to completely hydrolyze the APTES
loading. Finally, the solids were dried at room temperature and
then at 383 K for 24 h.
2.2. Preparation of amine-functionalized SBA-15The amino-containing SBA-15 mesoporous substrates were synthesizedusing as source of amino groups, 3-aminopropyl-triethoxysilane(APTES: NH2(CH2)3Si(OEt)3; 99%; Aldrich) in ethanol(absolute, Sigma–Aldrich) [39]. Each organic–inorganic hybridmaterial was prepared in unequal concentration solutions of APTESto obtain samples with the following TEOS:APTES molar compositions:1:0.2, 1:0.3, and 1:0.4. The NH2-containing samples arecoded hereafter as SBA15–0.2NH2, SBA15–0.3NH2 and SBA15–0.4NH2. The concentration of APTES corresponded to the theoreticallynecessary concentration of APTES already mentioned. Onegram of SBA-15 was dispersed into APTES-ethanol solution at roomtemperature in an inert atmosphere for 30 min. Then, deionizedwater was slowly added and the liquid suspension was stirredfor 30 min. Water was incorporated in order to perform hydrolysisof the alkoxide groups of APTES. The amount of water added wastwice the amount required to completely hydrolyze the APTESloading. Finally, the solids were dried at room temperature andthen at 383 K for 24 h.
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