Morpho ierarhic TiO2 with plasmonic gold decoration for highly active photocatalysis properties

Ștefănescu, Mihai; Cursaru, Diana; Ghita, Danuta; Dinescu, Adrian

doi:10.1016/j.matlet.2015.10.012

Cited by 9 publications

(4 citation statements)

References 23 publications

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“…The decrease of the bandgap in Au/TiO 2 was related to the shift absorption to longer wavelengths. Similar results have been reported in the literature [49,50].…”

Section: Nanocomposite Characterizationsupporting

confidence: 93%

Enhanced Photocatalytic Activity of Au/TiO2 Nanoparticles against Ciprofloxacin

Martins

Kappert

et al. 2020

Catalysts

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In the last decades, photocatalysis has arisen as a solution to degrade emerging pollutants such as antibiotics. However, the reduced photoactivation of TiO2 under visible radiation constitutes a major drawback because 95% of sunlight radiation is not being used in this process. Thus, it is critical to modify TiO2 nanoparticles to improve the ability to absorb visible radiation from sunlight. This work reports on the synthesis of TiO2 nanoparticles decorated with gold (Au) nanoparticles by deposition-precipitation method for enhanced photocatalytic activity. The produced nanocomposites absorb 40% to 55% more radiation in the visible range than pristine TiO2, the best results being obtained for the synthesis performed at 25 °C and with Au loading of 0.05 to 0.1 wt. %. Experimental tests yielded a higher photocatalytic degradation of 91% and 49% of ciprofloxacin (5 mg/L) under UV and visible radiation, correspondingly. Computational modeling supports the experimental results, showing the ability of Au to bind TiO2 anatase surfaces, the relevant role of Au transferring electrons, and the high affinity of ciprofloxacin to both Au and TiO2 surfaces. Hence, the present work represents a reliable approach to produce efficient photocatalytic materials and an overall contribution in the development of high-performance Au/TiO2 photocatalytic nanostructures through the optimization of the synthesis parameters, photocatalytic conditions, and computational modeling.

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“…The decrease of the bandgap in Au/TiO 2 was related to the shift absorption to longer wavelengths. Similar results have been reported in the literature [49,50].…”

Section: Nanocomposite Characterizationsupporting

confidence: 93%

Enhanced Photocatalytic Activity of Au/TiO2 Nanoparticles against Ciprofloxacin

Martins

Kappert

et al. 2020

Catalysts

View full text Add to dashboard Cite

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“…ZnO is one of the semiconductors which can be grown by atomic layer deposition (ALD) conformally on the scale-covered butterfly wings in such a way that the nanoscale features are preserved and can be used for photocatalysis [19,20]. Similar results can be achieved by depositing TiO 2 coating onto butterfly wings, however, due to its large band gap, it has to be doped with metallic or non-metallic elements to expand its absorption spectrum from the UV to the visible [21][22][23]. The oblique-angle deposition technique, which is based on traditional vapour-deposition processes, is also a versatile tool that allows the growth of thin films comprising one-, two-or three-dimensional biological nanoarchitectures [24,25].…”

Section: Introductionmentioning

confidence: 99%

Spectral tuning of biotemplated ZnO photonic nanoarchitectures for photocatalytic applications

et al. 2022

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The photocatalytic activity of a flat surface can be increased by micro- and nanostructuring the interface to increase the area of the contact surface between the photocatalyst and the solute, and moreover, to optimize charge carrier transfer. Further enhancement can be achieved by using photonic nanostructures, which exhibit photonic band gap (PBG). Structurally coloured butterfly wings offer a rich ‘library’ of PBGs in the visible spectral range which can be used as naturally tuned sample sets for biotemplating. We used conformal atomic layer deposition of ZnO on the wings of various butterfly species ( Arhopala asopia , Hypochrysops polycletus , Morpho sulkowskyi , Polyommatus icarus ) possessing structural colour extending from the near UV to the blue wavelength range, to test the effects arising from the nanostructured surfaces and from the presence of different types of PBGs. Aqueous solutions of rhodamine B were used to test the enhancement of photocatalytic activity that was found for all ZnO-coated butterfly wings. The best reaction rate of decomposing rhodamine B when illuminated with visible light was found in 15 nm ZnO coated M. sulkowskyi wing, the reflectance of which had the highest overlap with the absorption band of the dye and had the highest reflectance intensity.

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“…However, the hypothesized mechanisms in some cases are questionable. 6,7 Most of the authors agree that the plasmonic properties depend on the nanostructures' size, composition and environment. 8,9 For instance, the sizes for which they observe hot electron injection are different in various cases, although the substrate is the same.…”

Section: Introductionmentioning

confidence: 99%