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Processing fly ash stabilized hydrogen titanate nano-sheets for industrial dye-removal application
P Hareesh1, K B Babitha, S Shukla
1Materials Science and Technology Division (MSTD), National Institute for Interdisciplinary Science and Technology (NIIST), Council of Scientific and Industrial Research (CSIR), Industrial Estate P.O., Pappanamcode, Thiruvananthapuram 695019, Kerala, India.
Journal of Hazardous Materials
|June 22, 2012
Summary
Researchers developed fly ash (FA) stabilized hydrogen titanate nano-sheets for dye removal. This novel method uses modified FA and hydrothermal treatment, yielding materials with high surface area for efficient adsorption.
Area of Science:
- Materials Science
- Environmental Chemistry
- Nanotechnology
Background:
- Fly ash (FA) is an industrial byproduct often containing silica.
- Hydrogen titanate materials are known for adsorption properties but can form nanotubes.
- Surface modification and controlled processing are key to tailoring material morphology and function.
Purpose of the Study:
- To develop a novel method for processing fly ash (FA) stabilized hydrogen titanate nano-sheets.
- To investigate the structural transformation of FA-coated titania under hydrothermal conditions.
- To evaluate the application of the synthesized nano-sheets for organic synthetic dye removal from aqueous solutions.
Main Methods:
- Surface modification of industrial silica-based FA with anatase-titania (TiO(2)) via sol-gel.
- Hydrothermal treatment of TiO(2)-coated FA in a highly alkaline solution under elevated temperature and pressure.
- Characterization of the resulting material morphology and surface area.
- Adsorption experiments for synthetic dye removal from water.
Main Results:
- Hydrothermal conditions dissolved silica from FA, enabling the adsorption of FA constituents onto hydrogen titanate.
- This adsorption stabilized hydrogen titanate in a nano-sheet morphology, differing from typical nanotubes.
- The FA-stabilized hydrogen titanate nano-sheets exhibited a higher specific surface area compared to hydrogen titanate nanotubes.
- The nano-sheets were effective in removing an organic synthetic dye from aqueous solution through electrostatic attraction and ion-exchange mechanisms.
Conclusions:
- A new method successfully produced fly ash-stabilized hydrogen titanate nano-sheets.
- The nano-sheet morphology, stabilized by FA constituents, offers enhanced surface area.
- These materials show promise for efficient removal of organic synthetic dyes from wastewater via adsorption.
