Processing fly ash stabilized hydrogen titanate nano-sheets for industrial dye-removal application.
We report a new method for the processing of fly ash (FA) stabilized hydrogen titanate nano-sheets in the form of aggregated microspheres. The industrial silica-based FA has been utilized for this purpose which has been surface-modified by coating with the anatase-titania (TiO(2)) via sol-gel. The anatase-TiO(2) coated FA particles are subjected to the hydrothermal treatment in an autoclave under high temperature and pressure conditions in a highly alkaline solution. The hydrothermal conditions cause dissolution of silica resulting in the disintegration of other constituents of FA which are adsorbed in ionic and/or oxidized form on the surface of intermediate product of the hydrothermal treatment of anatase-TiO(2), specifically the hydrogen titanate. The adsorption of FA constituents has resulted in the stabilization of hydrogen titanate in the nano-sheet morphology instead of nanotubes. The FA stabilized hydrogen titanate nano-sheets exhibit higher specific surface-area than that of the hydrogen titanate nanotubes and have been successfully utilized for the removal of an organic synthetic-dye from an aqueous solution via surface-adsorption, involving the electrostatic-attraction and ion-exchange mechanisms operating, in the dark-condition.
Materials 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.
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P
Hareesh
K B
KB
Babitha
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S
Shukla
D000327:Adsorption; D060729:Coal Ash / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D004785:Environmental Pollutants / Q000737:chemistry*; D007220:Industrial Waste; D049329:Nanostructures / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
D060729:Coal Ash; D004396:Coloring Agents; D004785:Environmental Pollutants; D007220:Industrial Waste; D014025:Titanium