Anatase Rutile Reduction

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(PDF) The Photocatalytic Reduction of Hexavalent Chromium ...

The Photocatalytic Reduction of Hexavalent Chromium by Controllable Mesoporous Anatase TiO2 Nanoparticles ... .–. eV when com pared to the reported value for the bulk anatase and rutile phases ...

Comparison of the reduction of metal oxide surfaces: TiO2 ...

May 20, 2005· Reduction of stoichiometric metal oxide can be reached by two processes: oxygen vacancies or hydrogenation. We present DFT-GGA periodic calculations for the O vacancies in the bulk and selected slabs of TiO 2-rutile, TiO 2-anatase, and SnO 2-rutile as well as their hydrogenation.We focus on the comparison between these structures.

Review of the anatase to rutile phase transformation ...

Dec 08, 2010· Abstract. Titanium dioxide, TiO 2, is an important photocatalytic material that exists as two main polymorphs, anatase and rutile.The presence of either or both of these phases impacts on the photocatalytic performance of the material. The present work reviews the anatase to rutile …

New insights into fluorinated TiO2 (brookite, anatase and ...

Among all the phases, the oxidation activity of fluorinated TiO 2 can be ranked as brookite > anatase > rutile. Strikingly, the photocatalytic reduction activity for these fluorinated TiO 2 followed the same sequence. The variations of photocatalytic redox activity are most likely due to the synergism of phase composition control and surface ...

Photocatalytic CO2 Reduction with H2O on TiO2 Nanocrystals ...

Photocatalytic CO2 Reduction with H2O on TiO2 Nanocrystals: Comparison of Anatase, Rutile, and Brookite Polymorphs and Exploration of Surface Chemistry

Rutile titanium dioxide prepared by hydrogen reduction of ...

An important factor to improve the photocatalytic activity of rutile TiO 2 is H 2 reduction treatment. H 2-reduced rutile TiO 2 outperforms anatase-rich TiO 2 because of the wider absorption range caused by its smaller band gap (3.0 eV for rutile and 3.2 eV for anatase). The apparent quantum efficiency for H 2 evolution of H 2-reduced rutile ...

Phase-Selective Disordered Anatase/Ordered Rutile ...

Visible-light-driven photocatalytic CO2 reduction using TiO2 that can absorb light of all wavelengths has been sought for over half a century. Herein, we report a phase-selective disordered anatase/ordered rutile interface system for visible-light-driven, metal-free CO2 reduction using a narrow band structure, whose conduction band position matches well with the reduction potential of CO2 to ...

Photocatalytic CO 2 reduction with H 2O on TiO 2 ...

The production of CO and CH 4 from CO 2 photoreduction was remarkably enhanced on defective anatase and brookite TiO 2 (up to 10-fold enhancement) as compared to the defect-free surfaces. Defective brookite was photocatalytically more active than anatase and rutile, probably because of a lower formation energy of V O on brookite.

Titanium Dioxide (Anatase and Rutile): Surface Chemistry ...

Sep 25, 2014· Quantum Monte Carlo study of the energetics of the rutile, anatase, brookite, and columbite TiO2 polymorphs. Physical Review B 2017, 95 (12 ... Theoretical analyses of organic acids assisted surface-catalyzed reduction of Cr VI on TiO 2 nanowire arrays. Applied Catalysis B: Environmental 2016, 198, 508-515. DOI: 10.1016/j.apcatb.2016.06.002.

Photocatalytic activities of rutile and anatase ...

Nanoscale particles of rutile- and anatase-type titanium dioxides were selectively grown in acidic solutions of titanyl sulfate. The variation of photocatalytic activity as a function of UV light intensity was investigated using rutile and anatase powders having almost the same size (20-30 nm) and shape for a clear comparison of the performance depending on the crystal structure.

Why is anatase a better photocatalyst than rutile? - Model ...

Feb 10, 2014· The prototypical photocatalyst TiO 2 exists in different polymorphs, the most common forms are the anatase- and rutile-crystal structures. Generally, anatase is more active than rutile, but no consensus exists to explain this difference. Here we demonstrate that it is the bulk transport of excitons to the surface that contributes to the difference.

Bandgap reduction of photocatalytic TiO 2 nanotube by Cu ...

Sep 21, 2018· Bandgap reduction of photocatalytic TiO2 nanotube by Cu doping ... such as anatase, rutile and brookite or high pressure cotunnite and fluorite structures 1,2,3,4, as representative phases.

Phase role of white TiO2 precursor in its reduction to ...

Aug 22, 2019· However, in this work, it was experimentally demonstrated that the phase structure of white TiO 2 precursor plays an important role in its reduction to black TiO 2 by hydrogen treatment, namely, compared with anatase TiO 2, rutile TiO 2 is much easier to be reduced to black TiO 2. This provides a new direction for synthesis approach of black TiO 2.

Anatase, Brookite, and Rutile Nanocrystals via Redox ...

Anatase, rutile, and especially brookite nanocrystals have been selectively synthesized in this work via a redox route under mild hydrothermal conditions (180 °C, 3 h), employing trichloride as the titanium source and ammonium peroxodisulfate (APS), hydrogen peroxide, nitric acid, or perchloric acid as the oxidant.

Preparation of Blue TiO2 for Visible-Light-Driven ...

Due to high-temperature processing, a phase-selective reduction between the anatase and rutile TiO 2 phases is almost impossible. For the first time, phase-selective "disorder engineered" Degussa P 25 TiO 2 nanoparticles using simple room temperature solution processing was demonstrated as a very effective method to prepare modulatory TiO 2 .

AEROXIDE®, AERODISP® and AEROPERL® Titanium Dioxide …

rutile, anatase, and brookite. Rutile and anatase are produced industrially, either by the sulfate or chloride process, in large quantities and are used as pigments and catalysts, and in the production of ceramic materials. Titanium dioxide is of outstanding importance as a white pigment because of its scattering properties, its chemical

Carbothermic Reduction of Anatase and Rutile. | Request PDF

The carbothermic reduction of anatase and rutile to TiC was investigated using a combination of thermogravimetric analysis and X-ray diffraction.

Anatase - Wikipedia

Anatase is metastable at all temperatures and pressures, with rutile being the equilibrium polymorph. Nevertheless, anatase is often the first titanium dioxide phase to form in many processes, due to its lower surface energy, with a transformation to rutile taking place at elevated temperatures . Although the degree of symmetry is the same for ...

Difference Between Rutile and Anatase Titanium Dioxide ...

May 17, 2018· The key difference between rutile and anatase titanium dioxide is that rutile titanium dioxide has a deep red color appearance whereas the appearance of anatase titanium dioxide is colorless or white.. Titanium dioxide or TiO 2 is a very important mineral that has many favorable properties such as the production of titanium metal, to obtain TiO2 nanoparticles, etc.

Advances in Materials Science and Engineering - Hindawi

Advances in Materials Science and Engineering is a peer-reviewed, Open Access journal that publishes original research articles as well as review articles in all areas of materials science and engineering.

Carbothermic reduction of anatase and rutile - ScienceDirect

Mar 22, 2005· The carbothermic reduction of anatase and rutile to TiC was investigated using a combination of thermogravimetric analysis and X-ray diffraction. Samples premilled for 50 h prior to heat treatment showed a much greater extent of reduction compared with the unmilled powders.

Review of the anatase to rutile phase transformation

anatase and rutile. The presence of either or both of these phases impacts on the photocatalytic performance of the material. The present work reviews the anatase to rutile phase transformation. The synthesis and properties of anatase and rutile are examined, followed by a discussion of the thermodynamics of the phase transformation and the

(PDF) Photocatalytic Reduction of Uranyl Ions over Anatase ...

Li et al. [55] compared the photocatalytic activity for the reduction of U(VI) over rutile and anatase, and found that rutile showed higher reactivity than anatase.

Effect of elemental iron on the carbothermic reduction of ...

May 31, 2005· Effect of iron on the carbothermic reduction of anatase and rutile forms of titanium dioxide was studied. Differential thermogravimetric analysis indicated a significantly different reduction route in the presence of iron with a number of clear minima in the rate of mass loss observed.

Difference in TiO 2 photocatalytic mechanism between ...

Difference in TiO 2 photocatalytic mechanism between rutile and anatase studied by the detection of active oxygen and surface species in water

catalysts and rutile) nanoparticles as efficient ...

anatase and rutile TiO2 phase (PDF no. 21-1272 and PDF no. 21-1276), respectively, indicating that pure anatase and rutile were also successfully prepared, and after being calcinated, the phase structures were maintained. Table S1 The calculated lattice parameters, unit cell volume, crystalline size and specific surface area

Understanding the anatase–rutile phase junction in charge ...

Understanding the anatase–rutile phase junction in charge separation and transfer in a TiO2 electrode for photoelectrochemical water splitting† Ailong Li,ab Zhiliang Wang,ab Heng Yin,ab Shengyang Wang,ab Pengli Yan,ab Baokun Huang,a Xiuli Wang,a Rengui Li,a Xu Zong,a Hongxian Han*ac and Can Li*ac New insight into junction-based designs for efficient charge separation is vitally important ...

Excess electrons in reduced rutile and anatase TiO2 ...

Similar to rutile, anatase TiO 2 also has a tetragonal unit cell but the space group is I 41 / amd and the lattice parameters are a = b = 3.782 Å and c = 9.502 Å . In both phases, Ti atoms are at the center of distorted TiO 6 octahedra, while O atoms are three-fold coordinated. The distortion of the octahedral field of rutile is quite small.

Hydrogen Reduced Rutile Titanium Dioxide Photocatalyst ...

Despite the reputed lower activity of rutile TiO 2 than anatase, it is important to determine the physical properties affecting the photocatalytic efficiency of rutile TiO 2.This chapter explains the donor doping effect on rutile TiO 2 photocatalysts and the effect of H 2 reduction treatment on the photocatalytic activity of rutile TiO 2.The properties of the H 2-reduced rutile TiO 2 were ...

Photocatalytic CO2 Reduction with H2O on TiO2 Nanocrystals ...

CO2 photoreduction with water vapor has been studied on three TiO2 nanocrystal polymorphs (anatase, rutile, and brookite) that were engineered with defect-free and oxygen-deficient surfaces, respectively. It was demonstrated that helium pretreatment of the as-prepared TiO2 at a moderate temperature resulted in the creation of surface oxygen vacancies (VO) and Ti3+ sites on anatase and brookite ...