Journal
PHOTONICS AND NANOSTRUCTURES-FUNDAMENTALS AND APPLICATIONS
Volume 36, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.photonics.2019.100721
Keywords
Antimicrobial activity; Bacillus subtilis; Photocatalysis; Quantum dot; SILAR; TiO2
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Quantum dot (QD)-sensitized P25-TiO2 based nanocomposites were developed using the pseudo-successive ionic layer adsorption and reaction (p-SILAR) technique and then applied in the photocatalytic degradation of an azo-type dye under visible and ultraviolet (UV) irradiation. The presence of PbS and CdS QDs on the P25-TiO2 nanoparticles facilitated visible light absorbance by P25-TiO2 and increased the photocatalytic activity under visible irradiation, whereas the efficacy of P25-TiO2 as a photocatalyst was reduced under UV light. We confirmed the successful deposition of PbS and CdS QDs on TiO2 under analogous QD sensitization conditions with p-SILAR, and showed that the PbS QD-sensitized TiO2 nanocomposite (TPbS) harvested more visible light than the CdS QD-sensitized TiO2 nanocomposite (TCdS), thereby resulting in greater dye degradation under visible light. In particular, TPbS degraded (similar to)57% of the dye acid orange-56 and TCdS degraded 16%. The nanocomposites exhibited antimicrobial activity against Bacillus subtilis (B. subtilis) where the most effective antimicrobial agent with the highest activity was TCdS.
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