Vacuum-treated titanium dioxide nanocrystals: Optical properties, surface disorder, oxygen vacancy, and photocatalytic activities

Xia, Ting; Zhang, Yuliang; Murowchick, James B.; Chen, Xiaobo

doi:10.1016/j.cattod.2013.08.026

Cited by 169 publications

(96 citation statements)

References 56 publications

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“…Generally, all four types of polymorphs mentioned above comprise of TiO 6 octahedra, but differ in the distortion of the octahedron units and share edges and corners in different manners ( Figure 1) [25]. The differences in TiO 6 octahedra arrangement result in different physicochemical properties and thus 2.1.…”

Section: Basic Properties Of Black Tio 2 Versusmentioning

confidence: 99%

“…Over the past decades, nanotechnology has greatly contributed to the development of TiO 2 materials in photocatalysis across the globe [2][3][4][5][6][7]. However, the large bandgaps (3.0-3.2 eV over different phases) of TiO 2 nanomaterials limit their optical absorption to ultraviolet (UV) light, along with the rapid recombination of photo-excited electrons and holes, resulting in low photocatalytic efficiency [1][2][3][4][5][6][7][8][9][10][11]. Extending the utilization of solar energy to visible region has thus been the urgent need for practical applications of TiO 2 nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

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Black Titanium Dioxide Nanomaterials in Photocatalysis

Yan

Xia

2017

International Journal of Photoenergy

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Titanium dioxide (TiO 2 ) nanomaterials are widely considered to be state-of-the-art photocatalysts for environmental protection and energy conversion. However, the low photocatalytic efficiency caused by large bandgap and rapid recombination of photoexcited electrons and holes is a challenging issue that needs to be settled for their practical applications. Structure engineering has been demonstrated to be a highly promising approach to engineer the optical and electronic properties of the existing materials or even endow them with unexpected properties. Surface structure engineering has witnessed the breakthrough in increasing the photocatalytic efficiency of TiO 2 nanomaterials by creating a defect-rich or amorphous surface layer with black color and extension of optical absorption to the whole visible spectrum, along with markedly enhanced photocatalytic activities. In this review, the recent progress in the development of black TiO 2 nanomaterials is reviewed to gain a better understanding of the structure-property relationship with the consideration of preparation methods and to project new insights into the future development of black TiO 2 nanomaterials in photocatalytic applications.

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Section: Basic Properties Of Black Tio 2 Versusmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Black Titanium Dioxide Nanomaterials in Photocatalysis

Yan

Xia

2017

International Journal of Photoenergy

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“…As reported, oxygen deficiencies in TiO2 are reflected in a pronounced color change from transparent to light, and dark blue, which introduce changes in electronic structure (in particular a bandgap feature at ∼0.8 eV below EFermi) [10]. However, upon exposure to molecular oxygen gas even at room temperature, the oxygen defect stated disappears [11,12] due to dissociation of the gaseous oxygen and filling of the oxygen vacancies [6]. In the case of modified TiO2 via Al treatment, oxygen deficiencies was appeared after the process with the color change from white to grayish; and then after a week placed in the open air, the oxygen gas from its surrounding started to enter the oxygen vacancies (color changes were observed).…”

Section: Structure Features and Physical Propertiesmentioning

confidence: 79%

“…Photocatalytic activity of TiO2 nanomaterial is related to their optical absorption properties, crystallinity, defect structure and surface area [6]. In terms of the optical absorption properties, larger optical absorption can increase the amount of light absorbed, and generate more electrons and holes [7].…”

Section: Introductionmentioning

confidence: 99%

Visible Light Photocatalytic Properties of Modified Titanium Dioxide Nanoparticles via Aluminium Treatment

Ariyanti

Dong

et al. 2016

Bull. Chem. React. Eng. Catal.

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Titanium dioxide (TiO2) has gained much attentions for the last few decades due to its remarkable performance in photocatalysis and some other related properties. However, its wide bandgap (~3.2 eV) can only absorb UV energy which is only ~5% of solar light spectrum. The objective of this research was to improve the photocatalytic activity of TiO2 by improving the optical absorption to the visible light range. Here, colored TiO2 nanoparticles range from light to dark grey were prepared via aluminium treatment at the temperatures ranging from 400 to 600 o C. The modified TiO2 is able to absorb up to 50% of visible light (400-700 nm) and shows a relatively good photocatalytic activity in organic dye (Rhodamine B) degradation under visible light irradiation compared with the commercial TiO2. Copyright

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“…As a member of nanomaterials, nanostructured titanium dioxide (Tio 2 ) which has large surface area with a wide band gap, offers tunable crystal structure (rutile, anatase, brookite) [3][4]. Besides, as a carrier in drug delivery system, nano TiO 2 has attracted particular interest due to its nontoxic, chemically and biologically inert, readily available and excellent bio-compatibility [5]. In fact, nano structured TiO 2 is widely accepted as an efficient photo catalyst because of its merits of high chemical stability and photo catalytic activity, however, the wide band gap of three Tio 2 phases are 3.0, 3.2, and 3.25 ev, respectively, and it only responds to UV light which accounts for less than 5% of total solar radiation [6].…”

Section: Introductionmentioning

confidence: 99%

The Preparation and the Release Properties of Nanometer Titanium Dioxide

Bi¹,

Liu²,

Wen³

et al. 2017

JRST

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Nano titanium dioxide (TiO 2 ) was synthesized by using butyl titanium as raw material with sol-gel method and assisted with ultrasound. The products were characterized by X-Ray diffraction (XRD), Fourier transform infrared spectrophotometry (FTIR). The effects of hydrothermal temperature, ultrasonic time, ultrasonic power and acetic acid dosage were all investigated, and the optimal conditions for the crystal of nano TiO 2 were acid dosage 8 mL, temperature at 40°C, extration time 50 min and the ultrasonic power 240 W. A series of drug release experiments were employed in vitro, we found that the maximum drug loading rate reached 67.30%. The results reveal that nano TiO 2 is a promising biomedical nanomaterial in the application of drug loading system.

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Vacuum-treated titanium dioxide nanocrystals: Optical properties, surface disorder, oxygen vacancy, and photocatalytic activities

Cited by 169 publications

References 56 publications

Black Titanium Dioxide Nanomaterials in Photocatalysis

Black Titanium Dioxide Nanomaterials in Photocatalysis

Visible Light Photocatalytic Properties of Modified Titanium Dioxide Nanoparticles via Aluminium Treatment

The Preparation and the Release Properties of Nanometer Titanium Dioxide

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