Visible-light response Cr-doped TiO2−XNX photocatalysts

Pan, Chien-Cheng; Wu, Jeffrey C.S.

doi:10.1016/j.matchemphys.2005.12.013

Cited by 97 publications

(35 citation statements)

References 20 publications

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“…No characteristic peak of chromium oxide has been found, which hints either doped Cr was incorporated in the crystalline structure of the TiO2, or the chromium oxide was highly dispersed and its size was too small to be detected. The same results have been reported by many references [19][20][21]. The relatively higher diffraction peaks of anatase are detected from the M10-xCr-973 K/3 h, and the peaks of rutile become to be higher, with increasing the oxidation temperature to 1073 K or extending the oxidation time to 10 h. The effect on the phase transformation by adding Cr is relatively slight, along the red lines in Figure 2.…”

Section: Appearance and Phase Evolution Of Photocatalyst Composite Cosupporting

confidence: 88%

Fabrication of Photocatalyst Composite Coatings of Cr-TiO2 by Mechanical Coating Technique and Oxidation Process

Guan

Líu

et al. 2015

Coatings

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Abstract:The photocatalyst composite coatings on alumina (Al2O3) balls had been prepared by mechanical coating technique (MCT) with titanium (Ti) powder, adding a certain content of chromium (Cr) powder and a subsequent oxidation process. The effect of oxidation conditions and adding Cr on the composite coatings of chromium-titanium dioxide (Cr-TiO2) was investigated. The results show Cr-TiO2 coatings are with mixed-phase of anatase and rutile under different oxidation conditions, and the mass fraction of the rutile phase (XR) has been obviously increased when under 973 K. The SEM images indicate that adding Cr could significantly accelerate the growth of surface structures, especially at 1073 K. The photocatalytic activity of Cr-TiO2 coatings firstly increases, then decreases, with the addition of Cr. Compared with that of two other oxidation conditions, the enhancement on photocatalytic activity by adding Cr under visible light is relatively higher, especially at 973 K for 10 h.

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Section: Appearance and Phase Evolution Of Photocatalyst Composite Cosupporting

confidence: 88%

Fabrication of Photocatalyst Composite Coatings of Cr-TiO2 by Mechanical Coating Technique and Oxidation Process

Guan

Líu

et al. 2015

Coatings

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“…Moreover, doping could enhance its photoactivity by reducing the recombination of e -and h + pair and enhancing the interfacial [6], [7]. So far, various transition metal ions [8], [9], noble metal [10], and non-metals [11]- [13] [16]. Such wide variations in reported literatures should be mainly due to different preparation methods and doping elements which resulted in different physical properties of TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Morphological, Structural and Optical Properties Study of Transition Metal Ions Doped TiO2 Nanotubes Prepared by Hydrothermal Method

Razali¹,

Ahmad-Fauzi²,

Mohamed³

et al. 2013

IJMMM

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Abstract-Undoped TiO 2 nanotubes and doped titanium dioxide nanotubes with various transition metal ions (Co 2+ , Ni 2+ , Cu 2+ ) were prepared by hydrothermal method. The samples were characterized using X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), nitrogen gas adsorption and UV-Vis diffuse reflectance spectroscopy. The structural and morphological studies showed that the transition metal ion dopant was incorporated into interstitial positions of the TiO 2 lattice to form a new phase of TiO 2 (hexagonal) instead of anatase TiO 2 (tetragonal) for undoped TiO 2 nanotubes. It could be expected that doped TiO 2 nanotubes active under visible light due to their small band gap.Index Terms-Doped, photocatalyst, TiO 2 nanotubes, transition metal ion.

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“…Figure 49 shows the XRD patterns of the samples. It can be seen that only the diffraction peaks of Ti are detected from the M10-Ti, and mixed-phase with anatase and rutile from the M10-xCr-873 K. No characteristic peak of chromium oxide was found, which hints either doped Cr was incorporated in the crystalline of TiO2, or the chromium oxide was highly dispersed and its size was too small to be detected [55][56][57]. While at the temperature of 973 K, the phase obviously changes from anatase to rutile when adding Cr, which suggests that Cr could accelerate the phase transformation from anatase to rutile [58].…”

Section: Influence On Photocatalyst Coatings Of Tio2 By Adding Crmentioning

confidence: 96%

Review on the Photocatalyst Coatings of TiO2: Fabrication by Mechanical Coating Technique and Its Application

Guan

Líu

et al. 2015

Coatings

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This review presents the latest results of studies directed at photocatalyst coatings of titanium dioxide (TiO2) prepared by mechanical coating technique (MCT) and its application. Compared with traditional coating techniques, MCT is a simple, low cost and useful coating formation process, which is proposed and developed based on mechanical frictional wear and impacts between substrate materials and metal powder particles in the bowl of planetary ball mill. The formation process of the metal coatings in MCT includes four stages: The nucleation by adhesion, the formation and coalescence of discrete islands, formation and thickening of continuous coatings, exfoliation of continuous coatings. Further, two-step MCT was developed based on the MCT concept for preparing composite coatings on alumina (Al2O3) balls. This review also discusses the influence on the fabrication of photocatalyst coatings after MCT and improvement of its photocatalytic activity: oxidation conditions, coating materials, melt salt treatment. In this review, the oxidation conditions had been studied on the oxidation temperature of 573 K, 673 K, 773 K, 873 K, 973 K, 1173 K and 1273 K, the oxidation time of 0.5 h, 1 h, 3 h, 10 h, 15 h, 20 h, 30 h, 40 h, and 50 h. The photocatalyst coatings showed the highest photocatalytic activity with the oxidation condition of 1073 K for 15 h. The metal powder of Ti, Ni and Cr had been used as the coating materials. The composite metal powder could affect the surface structure and photocatalytic OPEN ACCESSCoatings 2015, 5 426 activity. On the other hand, the melt salt treatment with KNO3 is an effective method to form the nano-size structure and enhance photocatalytic activity, especially under visible light.

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Visible-light response Cr-doped TiO2−XNX photocatalysts

Cited by 97 publications

References 20 publications

Fabrication of Photocatalyst Composite Coatings of Cr-TiO2 by Mechanical Coating Technique and Oxidation Process

Fabrication of Photocatalyst Composite Coatings of Cr-TiO2 by Mechanical Coating Technique and Oxidation Process

Morphological, Structural and Optical Properties Study of Transition Metal Ions Doped TiO2 Nanotubes Prepared by Hydrothermal Method

Review on the Photocatalyst Coatings of TiO2: Fabrication by Mechanical Coating Technique and Its Application

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