Intracrystalline Structure and Physicochemical Properties of Mixed SiO2−TiO2 Sol-Pillared Aluminosilicate
| Autor: | Jae-Hun Yang, Joo Byoung Yoon, Seong Ju Hwang, Joo Hyoung Park, Jin-Ho Choy |
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| Rok vydání: | 2006 |
| Předmět: | |
| Zdroj: | The Journal of Physical Chemistry B. 110:1592-1598 |
| ISSN: | 1520-5207 1520-6106 |
| DOI: | 10.1021/jp055601x |
| Popis: | Highly porous layered inorganic-inorganic nanohybrids were prepared by pillaring SiO2-TiO2 nanosol particles with aluminosilicate layers. According to powder X-ray diffraction analysis, the basal spacing of SiO2-TiO2 pillared aluminosilicate (STPC) calcined at 400 degrees C was determined to be larger than 40 A. N2 adsorption-desorption isotherm measurements showed the STPC to have a large Brunauer-Emmett-Teller surface area of approximately 590 m2/g, of which approximately 70% originates from micropores with a size range of 8-16 A. The sorption behavior of various solvent vapors such as hexane, methanol, and water reveals internal pore surfaces of the STPC to be hydrophobic. A distinct blue shift of absorption edge in UV-vis spectra clearly demonstrates that the nanosized TiO2 particles are formed between silicate layers as a pillar. Fourier transform infrared and extended X-ray absorption fine structure analysis at the Ti K edge reveals that the pillared titania exists in the form of anatase-structured TiO2 nanocrystals, not in the form of covalently bonded mixed particles of TiO2-SiO2. On the basis of the present findings, we are able to conclude that the quantum-sized TiO2 and SiO2 particles are independently intercalated to form a multilayer stacking intracrystalline structure in the gallery space of aluminosilicate clay. |
| Databáze: | OpenAIRE |
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