Visible-light-active silver- , vanadium-codoped TiO2 with improved photocatalytic activity

Khan, Matiullah; Zeng, Yi; Gul, Sahar Ramin; Wang, Yongzhe; Fawad, U.

doi:10.1007/s10853-017-0798-y

Cited by 14 publications

(7 citation statements)

References 35 publications

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“…The absorption spectrum of the TiO 2 has a relationship with the optical band gap. Therefore, the spectrum of the TiO 2 can be tuned by doping various elements, which create states in band gap or mix with valence or conduction band [ 5 , 32 , 33 ]. The calculated band gap of pure TiO 2 (2.13 eV) is underestimated relative to the 3.20 eV.…”

Section: Resultsmentioning

confidence: 99%

Analysis of Indium Oxidation State on the Electronic Structure and Optical Properties of TiO2

Khan

Lan²,

Zeng

2018

Materials

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Due to the high formation energy of Indium interstitial defect in the TiO2 lattice, the most probable location for Indium dopant is substitutional sites. Replacing Ti by In atom in the anatase TiO2 shifted the absorption edge of TiO2 towards visible regime. Indium doping tuned the band structure of TiO2 via creating In 5p states. The In 5p states are successfully coupled with the O 2p states reducing the band gap. Increasing In doping level in TiO2 improved the visible light absorption. Compensating the charge imbalance by oxygen vacancy provided compensated Indium doped TiO2 model. The creation of oxygen vacancy widened the band gap, blue shifted the absorption edge of TiO2 and declined the UV light absorption. The 2.08% In in TiO2 is the optimal Indium doping concentration, providing suitable band structure for the photoelectrochemical applications and stable geometrical configuration among the simulated models. Our results provide a reasonable explanation for the improved photoactivity of Indium doped TiO2.

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Section: Resultsmentioning

confidence: 99%

Analysis of Indium Oxidation State on the Electronic Structure and Optical Properties of TiO2

Khan

Lan²,

Zeng

2018

Materials

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“…3.0-3.2 eV (depending on the polymorphic form) is well known from high photocatalytic activity under UV, but also inactivity under visible light (vis). Accordingly, many studies have been performed to modify the structure of titania (and other wide-bandgap semiconductors) via doping, surface modification and coupling with other materials (Khalil et al, 1998;Wu et al, 1998;Zang et al, 2000;Asahi et al, 2001;Ohno et al, 2003;Mitoraj et al, 2007;Zaleska, 2008;Dai et al, 2009;Etacheri et al, 2015;Janczarek et al, 2015;Wang et al, 2016;Babu et al, 2017;Khan et al, 2017;Salehi-Abar and Kazempour, 2017;Sun et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Property-governed performance of platinum-modified titania photocatalysts

Wang

Kowalska

2022

Front. Chem.

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Titania is probably the most widely investigated semiconductor photocatalyst because of various advantages, such as high activity, thermal and chemical stability, low price, abundance, and negligible toxicity. However, pristine titania is also characterized by charge carriers’ recombination, and thus lower quantum yields of photocatalytic reactions than theoretical 100%. Moreover, its wide bandgap, despite being recommended for excellent redox properties, means also inactivity under visible part of solar radiation. Accordingly, titania has been surface modified, doped and coupled with various elements/compounds. For example, platinum deposited on the surface of titania has shown to improve both UV activity and the performance under vis. Although the studies on titania modification with platinum started almost half a century ago, and huge number of papers have been published up to now, it is unclear which properties are the most crucial and recommended to obtain highly efficient photocatalyst. In the literature, the opposite findings could be found on the property-governed activities that could result from huge differences in the reaction systems, and also examined photocatalysts. Considering the platinum properties, its content, the size of nanoparticles and the oxidation state, must be examined. Obviously, the characteristics of titania also influence the resultant properties of deposited platinum, and thus the overall photocatalytic performance. Although so many reports on Pt/TiO2 have been published, it is hardly possible to give indispensable advice on the recommended properties. However, it might be concluded that usually fine platinum NPs uniformly deposited on the titania surface result in high photocatalytic activity, and thus in the low optimal content of necessary platinum. Moreover, the aggregation of titania particles might also help in the lowering the necessary platinum amount (even to 0.2 wt%) due to the interparticle electron transfer mechanism between titania particles in one aggregate. In respect of platinum state, it is thought that it is highly substrate-specific case, and thus either positively charged or zero valent platinum is the most recommended. It might be concluded that despite huge number of papers published on platinum-modified titania, there is still a lack of comprehensive study showing the direct correlation between only one property and the resultant photocatalytic activity.

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“…Khan [ 160 ] et al. synthesized silver‐and/or vanadium‐doped TiO 2 nanoparticles by a one‐step hydrothermal method.…”

Section: Different Types Of Nanoscale Spherical Tio2 Modificationmentioning

confidence: 99%

Progress on the nanoscale spherical TiO₂ photocatalysts: Mechanisms, synthesis and degradation applications

et al. 2020

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Titanium dioxide (TiO2) has the advantages of strong photocatalytic activity, non‐toxicity, and low cost, and so on. It has always occupied a dominant position in many photocatalytic materials, especially nanoscale spherical TiO2 has the characteristics of high specific surface area and pore‐volume, and so on. Therefore, Degussa P25, as a typical representative of the nanoscale spherical structure, is currently the only material produced on a large scale. According to the structure, nanoscale spherical TiO2 can be divided into three types: solid, core‐shell, and hollow spheres. However, there is still a lack of the latest review on the synthetic doping and application of nanoscale spherical TiO2. Therefore, we first describe the degradation mechanism of nanoscale spherical TiO2 and summarize the latest progress of its synthesis strategy in this review, including doping and other modification techniques, and finally introduce the application of nanoscale spherical TiO2 photocatalytic degradation of volatile organic compounds, dye wastewater, antibiotics, pesticides, and oily wastewater. Through this review, it is helpful for researchers to further understand the synthesis and application of nanoscale spherical TiO2, hoping to continuously improve the disadvantages and photocatalytic activity of nanoscale spherical TiO2, and promote the widespread application of nanoscale spherical TiO2 on an industrial scale.

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Visible-light-active silver- , vanadium-codoped TiO2 with improved photocatalytic activity

Cited by 14 publications

References 35 publications

Analysis of Indium Oxidation State on the Electronic Structure and Optical Properties of TiO2

Analysis of Indium Oxidation State on the Electronic Structure and Optical Properties of TiO2

Property-governed performance of platinum-modified titania photocatalysts

Progress on the nanoscale spherical TiO₂ photocatalysts: Mechanisms, synthesis and degradation applications

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Visible-light-active silver- , vanadium-codoped TiO2 with improved photocatalytic activity

Cited by 14 publications

References 35 publications

Analysis of Indium Oxidation State on the Electronic Structure and Optical Properties of TiO2

Analysis of Indium Oxidation State on the Electronic Structure and Optical Properties of TiO2

Property-governed performance of platinum-modified titania photocatalysts

Progress on the nanoscale spherical TiO2 photocatalysts: Mechanisms, synthesis and degradation applications

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Product

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Progress on the nanoscale spherical TiO₂ photocatalysts: Mechanisms, synthesis and degradation applications