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Structural and morphological transformations of mesostructured titanium phosphate through hydrothermal treatment
Lianzhou Wang1, Zhimin Yan, Shizhang Qiao
1ARC Centre of Excellence for Functional Nanomaterials, University of Queensland, St Lucia, Brisbane, QLD 4072, Australia.
Journal of Colloid and Interface Science
|September 25, 2007
Summary
Hydrothermal treatment transforms mesostructured titanium phosphate (TiPO) from hexagonal to lamellar structures, altering particle morphology. This structural change, influenced by temperature and time, affects UV-vis spectra and involves new POH groups.
Area of Science:
- Materials Science
- Nanotechnology
- Solid-State Chemistry
Background:
- Mesoporous materials offer high surface area and tunable properties for various applications.
- Titanium phosphate (TiPO) is a versatile material with potential in catalysis and energy storage.
- Controlling the structure and morphology of TiPO is crucial for optimizing its performance.
Purpose of the Study:
- To investigate the phase transformation of mesostructured titanium phosphate (TiPO) under hydrothermal conditions.
- To elucidate the relationship between synthesis parameters, resulting mesostructure, and material properties.
- To understand the morphological evolution and spectral characteristics of TiPO during phase transformation.
Main Methods:
- Hydrothermal treatment at varying temperatures and durations.
- X-ray Diffraction (XRD) for phase and structural analysis.
- Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) for morphology.
- UV-vis spectroscopy and Fourier-Transform Infrared (FT-IR) spectroscopy for optical and chemical properties.
- Solid-state 31P Magic Angle Spinning Nuclear Magnetic Resonance ((31)P MAS NMR) for detailed structural insights.
Main Results:
- A phase transformation from hexagonal to lamellar mesostructured TiPO was achieved via simple hydrothermal treatment.
- XRD patterns confirmed distinct mesostructures formed by varying temperature or treatment time.
- SEM and TEM revealed a morphological shift from individual particles to interconnected nanoplatelets.
- Lamellar mesostructured TiPO exhibited a significant blue shift in UV-vis spectra, attributed to altered Ti-sites.
- FT-IR and (31)P MAS NMR indicated the presence of additional POH groups in the lamellar structure.
Conclusions:
- Hydrothermal treatment is an effective method for inducing phase transformation and morphological changes in mesostructured TiPO.
- Synthesis parameters like temperature and duration critically influence the resulting TiPO mesostructure and morphology.
- The observed spectral changes, particularly the UV-vis blue shift, are linked to structural modifications and the presence of POH groups in the lamellar phase.
- These findings provide insights into the controlled synthesis of tailored titanium phosphate materials.
