SYNTHESISOF MESOPOROUSTITANIA BY POTATOSTARCH TEMPLATED SOL-GEL REACTIONSAND ITS CHARACTERIZATION
ABSTRACT Mesoporous titania powders with high-order crystalline building blocks had been synthesized through the solgel process using potato starch gel template. Internal' spongelike pore structure of starch gel template was generated by heating the starch granules at 95°C in water solution and...
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| Format: | Article NonPeerReviewed |
| Published: |
[Yogyakarta] : Universitas Gadjah Mada
2009
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| Online Access: | https://repository.ugm.ac.id/28051/ http://i-lib.ugm.ac.id/jurnal/download.php?dataId=11114 |
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| Institution: | Universitas Gadjah Mada |
| Summary: | ABSTRACT
Mesoporous titania powders with high-order crystalline building blocks had been synthesized through the solgel
process using potato starch gel template. Internal' spongelike pore structure of starch gel template was
generated by heating the starch granules at 95°C in water solution and freezing the starch gel at -15°C. The
synthesis routes were performed by immersing the starch gel template for 4 days into the white colloidal solution of Ti02 nanoparticles, which were prepared by hydrolyzing titanium (IV) tetraisopropoxide (TTIP) in ethanol at pH 1. Mesoporous Ti02 powders were obtained by two different ways of template removal, performed by calcination of the TiOrstarch composites at 600°C for 4 h or combination of extraction with ethanol-HCI (2:1) at 80°C and calcination at 500°C for 4 h. Fourier Transform Infra Red (FT-IR) spectra shows both of template removal methods result in
decreasing of characteristic vibrational band of the starch hydrocarbon on the resulted Ti02 powders. The X-Ray Diffraction (XRD) pattern imply that the concentrations of starch gel template influence the anatase crystallite peaks intensity of the synthesized Ti02 powders. Ti02 templated by 20% of starch sponges gel has highest intensity of anatase crystallite. Scherrer calculation inidicated that anatase particle size has nanoscale dimmension up to 12.96 nm. The nano-architecturefeature of mesoporous Ti02 scaffolds was also evaluated by the Scanning Electron
Microscope (SEM). It is shown that mesoporous Ti02 framework consist of nanocrystalline Ti02 particles as buiding blocks. The N2adsorption-desorption isotherm curves assign that Ti02 powder resulted from extraction-calcination route has higher mesoporosity than that of only calcinated. The srnthesized mesoporous Ti02 powder exhibits high Brunauer-Emmet-Teller (BET) specific surface area up to 65.65m /g.
Keywords: mesoporous Ti02, potato starch, template |
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