Remarkable improvement of visible light photocatalytic activity of TiO 2  nanotubes doped sequentially with noble metals for removing of organic and microbial pollutants

Afsari, Mohsen; Youzbashi, A. A.; Nuranian, Hossein; Zahraee, Seyed Mohammad

doi:10.1016/j.materresbull.2017.05.026

Cited by 23 publications

(6 citation statements)

References 38 publications

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“…Such behavior is due to the fact that the incipient wet impregnation method, by occurring at a high rate of contact between the support and the dopant, prevents the dopant penetration by solution diffusion into the bulk of TiO 2 and, thus, creates double phase regions on the outer surface, in which the electron-hole pair recombination rate is decreased by the refuge of the electron from the conduction band of one phase on the conduction phase of the other phase. This phenomenon is widely documented in the literature [5,7,43] and occurs on the portion of the surface accessible for the irradiation and adsorption, where the adsorbed pollutant easily interacts with the active oxidizer radicals issued from the interaction between the water molecules and promoted electrons, thus enhancing the photocatalytic performance of the doped catalyst. Indeed, Zhou et al (2020) [50] reported that the redox reactions occurring on the catalyst surface complete the charge carrier recombination, maintaining the photocatalytic activity.…”

Section: Effect Of the Methods Used For Catalyst Synthesis On Its Photmentioning

confidence: 96%

TiO2 Doped with Noble Metals as an Efficient Solution for the Photodegradation of Hazardous Organic Water Pollutants at Ambient Conditions

Sescu

Favier

Lutic

et al. 2020

Water

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This work highlights new insights into the performance of TiO2 doped with noble metal catalysts for the photocatalytic degradation of organic water pollutants. Different samples of titanium dioxide doped with noble metals (Au and Pd) were successfully synthesized via incipient wet impregnation (IWI) and ultrasound-assisted impregnation (US) methods. X-ray diffraction, scanning electron microscopy and UV-Vis reflectance spectroscopy were used for the characterization of the obtained materials. Their photocatalytic efficiency was investigated in aqueous suspension thorough a series of laboratory tests performed under ultraviolet (UV-A) irradiation conditions using 2,4 dinitrophenol (2,4 DNP) as a target molecule. The results clearly show that the method used for the catalyst synthesis affects its photocatalytic activity. It was found that the samples prepared by the IWI method exhibited high photocatalytic activity, and the removal rate obtained with TiO2-Pd/IWI was higher than that found for TiO2-Au/IWI. Furthermore, for the best catalyst, some extra photocatalytic experiments were conducted with rhodamine 6G (R6G), a highly stable molecule with a very different chemical structure to 2,4 DNP, in order to check the reactivity of this material. Moreover, the recycling experiments carried out with TiO2-Pd/IWI clearly demonstrated the high photocatalytic stability of this material for the degradation of 2,4 DNP. All of the collected data confirmed the interesting photocatalytic potential of the selected catalyst in the elimination of organic pollutants with no obvious change in its reactivity after four reaction cycles, which is very promising for promoting future applications in water depollution.

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Section: Effect Of the Methods Used For Catalyst Synthesis On Its Photmentioning

confidence: 96%

TiO2 Doped with Noble Metals as an Efficient Solution for the Photodegradation of Hazardous Organic Water Pollutants at Ambient Conditions

Sescu

Favier

Lutic

et al. 2020

Water

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“…The substrate materials modified in the 27 articles mainly included metals, polymers, and bioactive materials (Figure 2). There were ten articles on the surface modification of pure titanium (Ti), including eight studies on titania nanotube (TNT) modification [30][31][32][33][34][35][36] and two studies on titanium surface modification [37,38]. Two studies [51,52] presented AuNPs that were used to improve the antibacterial effects of magnesium (Mg) alloys and nickel titanium.…”

Section: Implant Materials For Medical Applications Studied In Select...mentioning

confidence: 99%

Antibacterial Properties of Gold Nanoparticles in the Modification of Medical Implants: A Systematic Review

et al. 2022

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The widespread occurrence of bacterial infections and their increased resistance to antibiotics has led to the development of antimicrobial coatings for multiple medical implants. Owing to their desirable properties, gold nanoparticles (AuNPs) have been developed as antibacterial agents. This systematic investigation sought to analyze the antibacterial effects of implant material surfaces modified with AuNPs. The data from 27 relevant studies were summed up. The included articles were collected from September 2011 to September 2021. According to the retrieved literature, we found that medical implants modified by AuNPs have good antibacterial effects against gram-positive and gram-negative bacteria, and the antibacterial effects would be improved by near-infrared (NIR) radiation.

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“…The recognized mechanism corresponding to SPR and associated photoreactivity is not strictly The superior photocatalytic activity would benefit from the suitable ratio of Au and Ag, which could help to reduce the photogenerated electron-hole recombination via modifying the bandgap and trapping the charge carrier [45]. Similarly, Mohsen et al synthesized the Ag-Au-modified TiO 2 nanotube and investigated the photocatalytic degradation performance toward the MB under visible light, the results reveal that Au-Ag/TiO 2 nanotubes show remarkable enhancement of photocatalytic activity because of more visible light absorption [46]. Jaspal explored the photocatalytic performance of Ag-doped TiO 2 nanoparticle fabricated by the CTAB-assisted facile wet chemical method and concluded that 100 mL 8 µM aqueous solution of MB can be fully degraded under artificial sunlight within 60 min by using 5 mg Ag-TiO 2 nanoparticles, while 40% degradation was achieved by using the same amount of pure TiO 2 nanoparticles [47].…”

Section: Photocatalytic Assessmentmentioning

confidence: 99%

The Use of Tunable Optical Absorption Plasmonic Au and Ag Decorated TiO2 Structures as Efficient Visible Light Photocatalysts

et al. 2020

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Exploring solar-excited heterogeneous photocatalysts by taking advantage of surface plasmon resonance (SPR) has drawn growing research attention. As it could help to pave the way for global sustainable development. The decoration of TiO2 particles with noble metals possessing SPR effects is regarded as one of the most effective solutions. The perfect match of the SPR absorption band with the spectrum of incident light is an essential factor for plasmonic enhancement. However, modifying with sole noble metal is often limited as it tunes wavelength of only several nanometers. To overcome this drawback, an alternative approach can be offered by decoration with more than one noble metal. For instance, Au-Ag co-decoration displays greatly adjustable, composition-dependent SPR agent over a broad range of the visible light spectrum (ca. from 415 to 525 nm). Hence Au-Ag complex is a remarkable candidate for tuning the photo adsorption of TiO2 from UV to visible light. This study presents a novel and tailored method for the fabrication of Au-Ag co-modified TiO2 particles, and how Au-Ag dependent SPR was applied as the visible light-responsive TiO2 based photocatalysts in a simple but reliable way. The fabricated Au-Ag co-decorated TiO2 (AuxAg(1−x)/TiO2) was characterized and proved to own excellent stability and large specific surface area. The optimization of these particles against the wavelength of maximal solar light intensity was confirmed by photo degradation of methylene blue under visible light radiation. This work may provide further insight into the design of TiO2-based composites with improved photocatalytic properties for environmental remediation and renewable energy utilization.

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Remarkable improvement of visible light photocatalytic activity of TiO 2 nanotubes doped sequentially with noble metals for removing of organic and microbial pollutants

Cited by 23 publications

References 38 publications

TiO2 Doped with Noble Metals as an Efficient Solution for the Photodegradation of Hazardous Organic Water Pollutants at Ambient Conditions

TiO2 Doped with Noble Metals as an Efficient Solution for the Photodegradation of Hazardous Organic Water Pollutants at Ambient Conditions

Antibacterial Properties of Gold Nanoparticles in the Modification of Medical Implants: A Systematic Review

The Use of Tunable Optical Absorption Plasmonic Au and Ag Decorated TiO2 Structures as Efficient Visible Light Photocatalysts

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