Defect-engineered TiO2 Hollow Spiny Nanocubes for Phenol Degradation under Visible Light Irradiation

Kang, Xiaolan; Song, Xue‐Zhi; Han, Ying; Cao, Jun; Tan, Zhenquan

doi:10.1038/s41598-018-24353-8

Cited by 28 publications

(20 citation statements)

References 42 publications

(48 reference statements)

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“…Thus, non-metal ion doping (i.e., F and N ions) was also achieved simultaneously, further improving the transport and separation of photogenerated charge carriers. The as-prepared NF-TiO2−x exhibited excellent photocatalytic degradation and photoelectrochemical efficiency under visible light irradiation compared to pristine TiO2 [72,73]. To date, numerous strategies, either common or uncommon, have been developed to introduce various kinds of dopants or defects into the TiO 2 matrix.…”

Section: Intrinsic Defect Formationmentioning

confidence: 99%

“…An intriguing work carried out by Kang et al to establish hierarchical anatase TiO 2 nanocubes with hollow structures has been reported recently. Instead of seeking complicated templates or surfactants, they directly converted NH 4 TiOF 3 mesocrystals to hollow spiny TiO 2 with a high specific area and photodegradation activity [73].…”

Section: Tio2 Mesocrystalsmentioning

confidence: 99%

“…Zeng et al reported a H 2 reduction strategy to produce H-TiO 2 materials (with enhanced oxygen vacancy concentrations and distributions) that can promote formaldehyde decomposition in the dark [128]. Research of TiO 2 -based photocatalysts has also been conducted to facilitate removal of tetrachloroethylene [129], acetone [130], benzene [131], phenol [73], etc. from the atmosphere.…”

Section: Degradation Of Air Pollutantsmentioning

confidence: 99%

mentioning

confidence: 99%

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Titanium Dioxide: From Engineering to Applications

et al. 2019

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Titanium dioxide (TiO2) nanomaterials have garnered extensive scientific interest since 1972 and have been widely used in many areas, such as sustainable energy generation and the removal of environmental pollutants. Although TiO2 possesses the desired performance in utilizing ultraviolet light, its overall solar activity is still very limited because of a wide bandgap (3.0–3.2 eV) that cannot make use of visible light or light of longer wavelength. This phenomenon is a deficiency for TiO2 with respect to its potential application in visible light photocatalysis and photoelectrochemical devices, as well as photovoltaics and sensors. The high overpotential, sluggish migration, and rapid recombination of photogenerated electron/hole pairs are crucial factors that restrict further application of TiO2. Recently, a broad range of research efforts has been devoted to enhancing the optical and electrical properties of TiO2, resulting in improved photocatalytic activity. This review mainly outlines state-of-the-art modification strategies in optimizing the photocatalytic performance of TiO2, including the introduction of intrinsic defects and foreign species into the TiO2 lattice, morphology and crystal facet control, and the development of unique mesocrystal structures. The band structures, electronic properties, and chemical features of the modified TiO2 nanomaterials are clarified in detail along with details regarding their photocatalytic performance and various applications.

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Section: Intrinsic Defect Formationmentioning

confidence: 99%

Section: Tio2 Mesocrystalsmentioning

confidence: 99%

Section: Degradation Of Air Pollutantsmentioning

confidence: 99%

mentioning

confidence: 99%

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Titanium Dioxide: From Engineering to Applications

et al. 2019

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“…In another study, the synthesis of TiO 2 solid and hollow nanocubes have been demonstrated, as shown in Figure 2, and applied for the photocatalytic-mediated synthesis of benzimidazole under UV and visible conditions [46]. Similarly, TiO 2 with different morphologies such as nanospheres, nanocubes, nanotubes, nanorods, nanoflowers, nanosheets, and nanofibers have been synthesized and studied for their photocatalytic applications [47][48][49][50][51][52][53]. The size and morphology control over TiO 2 photocatalyst exhibit significant influences over their (i) optical properties such as tunable band-gap energy, repositioning of band edge positions, visible light absorption, etc., (ii) electronic properties such as increased carrier lifetime, enhanced photocurrent conduction, reduced recombination, and (iii) surface properties such as enhanced surface energy, porous structures, enhanced surface adsorption, etc.…”

Section: Morphology-dependent Photocatalytic Properties Of Tiomentioning

confidence: 99%

Insights into the TiO2-Based Photocatalytic Systems and Their Mechanisms

Sakar

Prakash

2019

Catalysts

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Photocatalysis is a multifunctional phenomenon that can be employed for energy applications such as H2 production, CO2 reduction into fuels, and environmental applications such as pollutant degradations, antibacterial disinfection, etc. In this direction, it is not an exaggerated fact that TiO2 is blooming in the field of photocatalysis, which is largely explored for various photocatalytic applications. The deeper understanding of TiO2 photocatalysis has led to the design of new photocatalytic materials with multiple functionalities. Accordingly, this paper exclusively reviews the recent developments in the modification of TiO2 photocatalyst towards the understanding of its photocatalytic mechanisms. These modifications generally involve the physical and chemical changes in TiO2 such as anisotropic structuring and integration with other metal oxides, plasmonic materials, carbon-based materials, etc. Such modifications essentially lead to the changes in the energy structure of TiO2 that largely boosts up the photocatalytic process via enhancing the band structure alignments, visible light absorption, carrier separation, and transportation in the system. For instance, the ability to align the band structure in TiO2 makes it suitable for multiple photocatalytic processes such as degradation of various pollutants, H2 production, CO2 conversion, etc. For these reasons, TiO2 can be realized as a prototypical photocatalyst, which paves ways to develop new photocatalytic materials in the field. In this context, this review paper sheds light into the emerging trends in TiO2 in terms of its modifications towards multifunctional photocatalytic applications.

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Semiempirical computational study of oxygen vacancies in a decahedral anatase nanoparticle

Vorontsov

Smirniotis

2018

Int J of Quantum Chemistry

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Formation of oxygen vacancies (VO) is an important step of many catalytic reactions following the Mars van Krevelen mechanism. High rate of oxidation is associated with low energy of VO formation while high selectivity requires an optimal energy of VO formation. In the present computational study, enthalpy of VO formation (ΔHOVF) is studied in a decahedral anatase nanoparticle (TiO2)121(H2O)6 using PM6 method. ΔHOVF shows large variations for oxygen atoms in different locations on facets, edges and vertices. VO are much more stable in the (101) facet compared to the (001) facet, while internal VO are more stable for (101) but equally stable for (001) facet compared to surface vacancies on average. Comparison with literature DFT methods results reveals good consistency and high computational efficiency of the PM6 method for vacancies formation energy. Pm6 also correctly predicts admixture states of the Ti3+ within the band gap, but absolute values of electronic band gap and position of admixture states is overestimated and needs scaling factors.

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Defect-engineered TiO2 Hollow Spiny Nanocubes for Phenol Degradation under Visible Light Irradiation

Cited by 28 publications

References 42 publications

Titanium Dioxide: From Engineering to Applications

Titanium Dioxide: From Engineering to Applications

Insights into the TiO2-Based Photocatalytic Systems and Their Mechanisms

Semiempirical computational study of oxygen vacancies in a decahedral anatase nanoparticle

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