Abstract
We describe three methods of post-synthesis modification of the SBA-15 mesoporous molecular sieve with titanium: impregnation with Ti(OEt)4 in an ethanolic solution, grafting with titanocene dichloride, and modification with colloidal titania. The products were characterized using X-ray diffraction (XRD) and N2 adsorption as well as Fourier-transform infrared and 29Si NMR spectroscopies. All three methods yield materials containing 1.4--4.7 wt.% titanium and with high surface areas. The absorbance at 960 cm−1 in SBA-15 modified with colloidal titania and SBA-15 grafted with titanocene indicates the formation of Ti–O bonds. All products showed significant activity towards the degradation of p-chlorophenol. UV-vis absorption spectra of SBA-15 samples modified with titanium indicate that the variation in the photocatalytic activity is governed by isolated titanium sites.
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Orlov, A., Zhai, QZ. & Klinowski, J. Photocatalytic properties of the SBA-15 mesoporous silica molecular sieve modified with titanium. J Mater Sci 41, 2187–2193 (2006). https://doi.org/10.1007/s10853-006-7184-5
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DOI: https://doi.org/10.1007/s10853-006-7184-5