Nano-Titania Decorated Fly Ash as Self-Cleaning Antibacterial Cool Pigment
2015
Fly ash (FA) is an industrial waste produced in large quantities whereas nano-TiO₂ is a widely studied material for multifarious applications. Synergy of the two materials is created to produce a multifunctional composite material for low cost NIR reflective coating applications. Effective formation of a TiO₂ shell on the FA core was achieved by use of an anionic surfactant (SDS). Studies on thermal annealing of specimen of different TiO₂ loadings showed changes in morphology of TiO₂ and effects on porosity, particle size, and phase of TiO₂. NIR reflectivity increased with increase in annealing temperatures as result of fusion of nanoparticles and formation of rutile phase. Change in porosity increased adsorption and decomposition of dye. The amorphous nature and higher surface area of nano-TiO₂ annealed at lower temperature showed better performance in zone-inhibition test to establish antimicrobial activity against Escherichia coli and Staphylococcus aureus indicating its self-cleaning nature. The present study discusses development of favorable conditions for incorporation of TiO₂ on FA while establishing the concept of making a sustainable material for energy conservation.
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