Abstract
Silica containing protonated 3-aminopropyl groups has been synthesized by a template method using Pluronic 123 as a surfactant in an acidic medium at a hydrochloric acid concentration of 1.72 M. The X-ray diffraction data have indicated that the obtained sample has a highly ordered hexagonal structure, which agrees with the large specific surface area and sorption pore volume (S sp = 880 m2/g, V s = 1.28 cm3/g) typical of SBA-15 materials. However, transmission electron microscopy data show that this material contains two phases, with one of them being similar to SBA-15 mesoporous silica and the other belonging to socalled “honeycomb foams.” An ion-exchange reaction has been employed to immobilize phosphomolybdic acid H3[P(Mo3O10)4] on the pore surface, and the fact of immobilization has been confirmed by IR and TGA data. This functionalization significantly reduces the S sp and V s values of the sample but has no effect on isotherm pattern, thereby attesting to retaining the silica structure after the modification.
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Original Russian Text © V.V. Sliesarenko, O.A. Dudarko, A.K. Matkovskii, G.R. Yurchenko, Yu.L. Zub, 2014, published in Kolloidnyi Zhurnal, 2014, Vol. 76, No. 3, pp. 397–402.
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Sliesarenko, V.V., Dudarko, O.A., Matkovskii, A.K. et al. Immobilization of phosphomolybdic acid on the surface of mesoporous silica functionalized with alkylammonium groups. Colloid J 76, 366–371 (2014). https://doi.org/10.1134/S1061933X14020124
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DOI: https://doi.org/10.1134/S1061933X14020124