کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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5367953 | 1388378 | 2011 | 8 صفحه PDF | دانلود رایگان |

A new class of organic-inorganic hybrid mesostructured silica-pillared clay (HSPC) has been prepared through the surfactant directed assembly of organosilica in the galleries of montmorillonite. The surfactant templates were removed from the pores by solvent-extraction. The products were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), nitrogen adsorption-desorption measurements, solid-state 29Si and 13C NMR, and Fourier-transform infrared (FT-IR) spectra. XRD patterns indicated a regular interstratifications of the clay layers for HSPCs. Depending on loading of phenyl groups, HSPCs had BET surface areas of 395-602Â m2Â gâ1, pore volumes of 0.34-0.79Â cm3gâ1, and the framework pore sizes in the supermicropore to small mesopore range (1.3-2.6Â nm). HSPCs were hydrophobic and acidic. The number of silanol groups on the surface of HSPC materials has been titrated by a surface reaction with hexamethyldisilazane, followed by quantification of the liberated NH3. Based on this method extracted HPCHs have high silanol numbers, a very important feature with respect to the amount of catalytic sites that can eventually be grafted onto the surface.
Research highlightsâ¶ Organic-inorganic hybrid mesostructured silica-pillared clay (HSPC) has been prepared. â¶ The templates were removed by solvent extraction. â¶ The extracted materials have a high surface area and ordered gallery pore size. â¶ HSPCs were hydrophobic and acidic. â¶ The physical chemistry properties activate the HSPCs for application in catalysis, adsorption, separation chemistry and biochemistry.
Journal: Applied Surface Science - Volume 257, Issue 10, 1 March 2011, Pages 4655-4662