Enhanced photocatalytic properties of lanthanide-TiO2 nanotubes: An experimental and theoretical study

Mazierski, Paweł; Lisowski, Wojciech; Grzyb, Tomasz; Winiarski, Michał J.; Klimczuk, Tomasz; Mikołajczyk, Alicja; Flisikowski, Jakub; Hirsch, A.; Kołakowska, Agnieszka; Puzyn, Tomasz; Zaleska-Medynska, Adriana; Nadolna, Joanna

doi:10.1016/j.apcatb.2016.12.044

Cited by 94 publications

(50 citation statements)

References 52 publications

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“…The green emission at 546 nm is the dominant one. The findings are in good agreement with the literature [29,60,64,69].…”

Section: Terbiumsupporting

confidence: 92%

“…In the means of energy, doping can alter absorption threshold to lower energies. Incorporation of RE ions into the TiO 2 host modifies the band gap of TiO 2 with sub-band-gap energy levels of RE ions, as illustrated in Figure 7(b) [64,77]. These energy levels offer electronic transition from the TiO 2 valence band to the empty RE ion sub-band-gap energy levels.…”

Section: Tio 2 Nanoparticlesmentioning

confidence: 99%

“…On the other hand, it promotes crystallization of several crystalline phases of TiO 2 , and with small amount of RE dopants mixtures of anatase and rutile are formed, while at higher temperatures dititanate structures were also formed[62].Electrochemical synthesis is a significant method in the preparation of TiO 2 nanotubes at substrates, providing the precise control of nanotube morphology, length and pore size, and the formation of thick walls at substrates. Electrolytes used in this procedure are fluorides, where the concentration strongly effects on the dimensions and pH on the thickness of TiO 2 nanotubes[63,64]. With anodic potential from 10 to 30 V, nanotubes with diameters between 15 and 200 nm are formed, and by cathodic electrochemical process RE ions are incorporated into the nanotubes.…”

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confidence: 99%

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Rare Earth‐Doped Anatase TiO2 Nanoparticles

Đorđević¹,

Milićević²,

Dramićanin³

2017

Titanium Dioxide

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Titanium dioxide is a wide band-gap semiconductor of high chemical stability, nontoxicity and large refractive index. Because of the high photocatalytic activity, anatase is a preferred TiO 2 form in many applications such as for air and water splitting and purification. Doping of TiO 2 with various ions can increase the photocatalytic activity by enhancing light absorption in visible region and can alter structure, surface area and morphology. Also, by doping TiO 2 with optically active ions, visible light via up-or downconversion luminescence can be produced. It is a challenge to optimize the synthesis procedure to incorporate rare earth RE 3+ ions into the TiO 2 structure due to large mismatch in ionic radii between the Ti 4+ and RE 3+ and because of the charge imbalance. Visible (VIS) and ultraviolet (UV) luminescence of several RE 3+ ions can be obtained when incorporated into anatase TiO 2 , also affecting microstructural characteristics of TiO 2. It is of great importance to summarize publications on rare earth-doped anatase TiO 2 nanoparticles to find correct TiO 2-RE combination to sensitize trivalent rare earths luminescence, as well as to predict or tune structural and morphological properties. A better understanding on these topics may progress the desired design of this kind of material towards specific applications.

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“…The green emission at 546 nm is the dominant one. The findings are in good agreement with the literature [29,60,64,69].…”

Section: Terbiumsupporting

confidence: 92%

Section: Tio 2 Nanoparticlesmentioning

confidence: 99%

mentioning

confidence: 99%

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Rare Earth‐Doped Anatase TiO2 Nanoparticles

Đorđević¹,

Milićević²,

Dramićanin³

2017

Titanium Dioxide

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“…These methods vary depending on the final structure that is desired, for example, to obtain thin films or coatings, the following methods are more used: Micro-arc oxidation [34], magnetron sputtering [35], spin coating [36] and dip coating [37]. To prepare powders with defined nanostructures are electrospinning (nanofibers) [38], anodization (nanotubes) [39], microemulsion (spheres) [40], hydrothermal (nanowires) [41], state solid reaction (amorphous) [42], impregnation (amorphous) [43], and sol-gel (different structures) [44]. All of them can be modified, combined with each other or coupled to different energy sources, such as microwaves [45] and ultrasounds [46], to create doped materials with unique photocatalytic properties.…”

Section: Methods Of Synthesis Of Tio 2 -Rementioning

confidence: 99%

Photocatalytic Treatment of Pesticides Using TiO₂ Doped with Rare Earth

Pérez¹,

Torres²,

Romero³

et al. 2019

Water and Wastewater Treatment

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Rare earth doping ions can improve the spectral response of this semiconductor to the visible region. This work evaluated the dopant effect of rare earth ions such as La, Ce, Nd, Pr, Sm, Eu, and Gd in titania for the solar photodegradation of Diuron and methyl parathion. The increase in the content up to 0.5% of dopants decreases photoactivity due to the formation of photo-generated electron-hole pair recombination centers. The catalysts calcined at 500°C presented only the anatase crystalline phase and the samples doped with La and Ce at 0.1 and 0.3% were the most active in diuron solar degradation; however, when the temperature of the thermal treatment increased to 800°C, mixtures of crystalline phases were presented. The catalyst with the highest anatase content showed the best performance. The materials calcined at 500°C with better performance in diuron solar degradation were selected to to treat methyl parathion using solar light. Finally, under these conditions, an affinity was found for the dopant ions in titania and in the functional groups of the contaminating molecules (phenylurea and thiophosphate). Solar photodegradation of diuron was more effective with La and Ce, while for methyl parathion, it was Eu at 0.3%.

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“…N, S, B, F, I), (iii) reduced form of TiO2-x, or (iv) doping with semiconductors, which have lower band gap energy. Recently, researchers provide potentials for TiO2 photocatalysts modified lanthanides, for example holmium atom [1]. The modified titanium dioxide nanomaterial can form the basis for the new generation semiconductor.…”

Section: Extended Abstractmentioning

confidence: 99%

Photocatalytic Activity of Er-TiO2 Nanocomposite

Wyrzykowska¹,

Mikołajczyk²,

Nadolna³

et al. 2017

Proceedings of the 2nd World Congress on Recent Advances in Nanotechnology

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Extended AbstractOne of the directions in the evolution of the environmental friendly technologies is developing efficient methods of contaminant disposal. Particularly, researchers pay attention to the semiconductor-based heterogeneous photocatalysis that plays a crucial role in degradation of impurities in the presence of TiO2 nanomaterials. At present, the methods based on photodegradation are widely used during purifications of water streams and wastewater, as well as to remove volatile substances from the atmosphere. This approach uses commonly available resources of solar radiation and simultaneously does not require additional chemicals during purification, what is a huge advantage over any other conventional methods.The photocatalytic property of TiO2 is closely related with the band gap energy. When the semiconductor (TiO2) is exposure on the solar radiation, the photon hv with the energy equal or greater than the band gap of TiO2 (~3.2 eV) creates electron-hole pair -the valence electron is excited and promoted to conduction band, while the positive hole is formed on the valence band. This metastable state can be recombine and release the energy as a heat or in reaction with surrounding electron donors/acceptors (causing their degradation at the same time) or as a result of interactions with the surrounding double layer of the particle. The minimum energy to performed electron-hole pair (~3.2 eV) corresponds to the photon energy at a wavelength of λ>388 nm, what is 3-5% of solar radiation. The main drawback of application of TiO2 NPs as environmentally benign treatment technology for a variety of pollutants is that it can only be excited by ultraviolet light. Thus, an extension of its absorption wavelength range to the visible region (vis) is desirable to use the main part of solar spectrum. One of the most promising approach for extension of the spectral sensitivity is to influence electronic properties of TiO2 by some structure modifications. In this way, it is possible to get an efficient photocatalyst activated of UV, Vis and NIR radiation. Reactivity of TiO2 in visible light (λ> 400 nm) can be achieved by: (i) transition metal ions doping (e.g. Cr, Mn, Mo, Nb, V, Fe, Ru, Au), (ii) non-metals doping (e.g. N, S, B, F, I), (iii) reduced form of TiO2-x, or (iv) doping with semiconductors, which have lower band gap energy. Recently, researchers provide potentials for TiO2 photocatalysts modified lanthanides, for example holmium atom [1]. The modified titanium dioxide nanomaterial can form the basis for the new generation semiconductor. The aim of the project is to develop the TiO2-based semiconductor having photocatalytic activity under visible (λ>380 nm) and NIR (λ>780 nm) radiation. This study has demonstrated application of the plane-wave-based Vienna ab-initio simulation package (VASP) to obtain predictive knowledge on structural features of RE-TiO2 nanoparticles (RE -rare earth metal) that may govern their photocatalytic activity. The main aim of presented research was to develop molecular models ...

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Enhanced photocatalytic properties of lanthanide-TiO2 nanotubes: An experimental and theoretical study

Cited by 94 publications

References 52 publications

Rare Earth‐Doped Anatase TiO2 Nanoparticles

Rare Earth‐Doped Anatase TiO2 Nanoparticles

Photocatalytic Treatment of Pesticides Using TiO₂ Doped with Rare Earth

Photocatalytic Activity of Er-TiO2 Nanocomposite

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Enhanced photocatalytic properties of lanthanide-TiO2 nanotubes: An experimental and theoretical study

Cited by 94 publications

References 52 publications

Rare Earth‐Doped Anatase TiO2 Nanoparticles

Rare Earth‐Doped Anatase TiO2 Nanoparticles

Photocatalytic Treatment of Pesticides Using TiO2 Doped with Rare Earth

Photocatalytic Activity of Er-TiO2 Nanocomposite

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Product

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Photocatalytic Treatment of Pesticides Using TiO₂ Doped with Rare Earth