Anatase Rutile Reduction

UV and visible light photocatalytic activity of Au/TiO2 ...

Jan 24, 2017· To magnify anatase/rutile phase junction effects through appropriate Au decorations, a facile solution-based approach was developed to synthesize Au/TiO2 nanoforests with controlled Au …

Isolation of anatase crystallites from anatase-rutile ...

The composition anatase/rutile/amorphous could be determined by analysis of P25 mixed with an internal standard, nickel(II) oxide. ... (via dioxygen reduction) and adsorbed on the anatase surface ...

Differential adhesion of Streptococcus gordonii to anatase ...

Exposure to 100 mg x L(-1) chlorhexidine for 60 s resulted in a fivefold reduction in S. gordonii coverage on anatase and a twofold reduction on rutile. This may be related to a preferential adsorption of chlorhexidine to anatase compared with rutile. The reduction in bacterial coverage was not due to desorption of chlorhexidine into solution.

In‐situ Self‐transformation Synthesis of N‐doped Carbon ...

Mar 18, 2020· Photocatalytic CO 2 reduction can reduce greenhouse gas emissions and convert CO 2 into value-added chemical feedstocks and fuels. P25 is one of the most popular photocatalyst, but its high photoinduced charge recombination rate and low CO 2 adsorption ability hinder its application in photocatalytic CO 2 reduction due to the limited anatase/rutile interface and small specific surface …

Carbothermic reduction of anatase and rutile - ScienceDirect

Mar 22, 2005· The reduction of rutile started at ∼830 °C whilst anatase underwent reduction at 870 °C. The initial identified products were Ti 5 O 9 and Ti 4 O 7 with the latter being the last apparently stable phase prior to TiC formation.

Review of the anatase to rutile phase transformation

the anatase to rutile transformation, and the principles of controlling phase composition through the inhibition or promotion of the transformation of anatase to rutile. Titania polymorphs Titanium dioxide, the only naturally occurring oxide of titanium at atmospheric pressure, exhibits three poly-morphs: rutile, anatase, and brookite [1–7].

Hydrogen Reduced Rutile Titanium Dioxide Photocatalyst ...

Nov 23, 2016· Highly efficient rutile photocatalyst is easily fabricated from P25 by H 2 reduction treatment at 700°C for 2 h [ 18 ]. The H 2 -reduced rutile TiO 2 outperforms anatase-rich TiO 2 because of the wider absorption range caused by its bandgap of rutile (3.0 eV) smaller than that of …

Carbothermic Reduction of Anatase and Rutile. | Request PDF

The reduction of rutile started at ∼830°C whilst anatase underwent reduction at 870°C. The initial identified products were Ti5O9 and Ti4O7 with the latter being the last apparently stable ...

Carbothermic Reduction of Anatase and Rutile., ChemInform ...

Jan 31, 2005· The reduction of rutile starts at about 830 °C, whereas reduction of anatase begins at 875 °C. The initial products are Ti 5 O 9 and Ti 4 O 7 with the latter being the last apparently stable phase prior to TiC formation. The TiC formed from anatase is stoichiometric whilst that from rutile is sub‐stoichiometric.

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 ...

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 July 2012 ACS Catalysis 2(8):1817–1828

Understanding the surface reduction of nano rutile and ...

Though black titania has been widely investigated, the influence of crystal phase during the reduction process remains unknown. In the present study, we found that the rutile phase is preferentially reduced over anatase from detailed experimental investigations and a comprehensive understanding of selective breaking of Ti-O bonds in surfaced TiO 6 octahedral motifs.

Differences in Selective Reduction Mechanism of 4 ...

Whereas Au/anatase shows a higher UV-light activity for the reduction of nitrobenzene than Au/rutile, the replacement of anatase by rutile greatly increases the visible-light activity of Au/TiO2 ...

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 ...

Materials | Free Full-Text | The Influence of Annealing on ...

23 · The films produced at room temperature are amorphous but after annealing consist of anatase crystallites. The layers fabricated at 227 °C contain both anatase and rutile phases. In this case the anatase crystallites are accumulated near the substrate interface whilst the rutile crystallites were formed closer to the surface of the TiO2 film.

Reduced extrinsic recombination process in anatase and ...

Mar 24, 2021· Using anatase Nb-doped TiO 2 epitaxial thin films and rutile Nb-doped TiO 2 epitaxial thin films, both with a 1 J cm −2 laser fluence, as a bottom electrode on the LaAlO 3 and γ-sapphire ...

The structure and catalytic activity of anatase and rutile ...

The structure and catalytic properties of anatase and rutile supported manganese oxide catalysts prepared by impregnation method have been studied by using X-ray diffraction (XRD), laser Raman spectroscopy (LRS), X-ray photoelectron spectroscopy (XPS), H 2 temperature-programmed reduction (H 2-TPR) and BET surface area measurements combined with activity testing of selective catalytic ...

Effect of consecutive and alternative oxidation and ...

Titania (anatase and rutile)-supported copper systems have been prepared by a conventional impregnation technique (2.5% Cu Ti atomic ratio). The effect of consecutive oxidation/reduction/ oxidation and reduction/oxidation treatments at 770 K on the final materials has been studied by X-ray diffraction, transmission electron microscopy, temperature-programmed reduction, and visible …

Mutual influence of cupric cations and several anions in ...

Anatase TiO 2 (AT) was purchased from Sigma-Aldrich, and a mixture of anatase and rutile (P25) from Degussa. Other chemicals in the analytic grade were obtained from Sinop-harm, including Cu(ClO 4) 2, NaClO 4, NaF, NaCl, NaNO 3, and Na 2 SO 4. Rutile TiO 2 (RT) was prepared from the hydrol-ysis of TiCl 4 in an iced HCl solution, followed by ...

(PDF) On Oxygen Activation at Rutile- and Anatase-TiO2

Anatase is the most active photocatalytic phase, a fact typically attributed to larger concentrations of surface hydroxyl and hence to an improved (compared to rutile) generation of HO • and H 2 ...

Activation of water on MnOx-modified rutile (110) and ...

x-modified anatase can show an off-stoichiometric ground state, through oxygen vacancy formation and cation reduction spontaneously, and both modified rutile and anatase are highly reducible with moderate energy costs. Manganese ions are therefore present in a …

Difference in TiO2 photocatalytic mechanism between rutile ...

Jun 15, 2015· Since the Ti–Ti distance on a rutile surface is smaller than that for anatase, rutile is capable of forming a surface structure such as Ti–OO–Ti, leading to readily form O 2. The mechanism of fast coupling of two photoinduced conduction band holes to form Ti–OO–Ti was proposed, which is accountable for the lower reactivity of rutile.

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

Feb 10, 2014· The prototypical photocatalyst TiO2 exists in different polymorphs, the most common forms are the anatase- and rutile-crystal structures. Generally, anatase …

Crystalline phase regulation of anatase–rutile TiO2 for ...

anatase and rutile crystalline phases. The content of rutile phase was calculated by eqn (3): WR ¼ IR 0:886IA þIR (3) where W R is the mass fraction of rutile crystalline phase, I A and I R are the diffraction peak intensity of anatase phase 2q ¼ 25.2 and rutile phase 2q ¼ 27.4 .26 Fig. 2 depicts the in uence of H 2O 2 volume on the contents

Review of the anatase to rutile phase transformation ...

Dec 08, 2010· Titanium dioxide, TiO2, 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 …

Regulation of the rutile/anatase TiO2 heterophase ...

Anatase/rutile TiO2 heterophase junction composites have been documented to have much higher photocatalytic activity than single phase TiO2 (nude anatase or nude rutile) for various chemical reactions, including hydrogen production from methanol–water solution and pollution degradation. Further improving the photocatalytic performance of heterophase junction photocatalysts is a subject worth ...

(PDF) Structural and Optical Properties of TiO2 Thin Films ...

The phase transformation from anatase to rutile takes place at temperature between 650 and 8008C, when annealed at temperature higher than 8008C a complete rutile phase forms which is lower than that of pure TiO2 thin ®lms. Above results indicate that upon addition of ZnFe2O4 nanoparticle, the crystallization of TiO2 thin ®lms shifts to Fig. 1.

Production of Titanium Nitride by Carbothermic Reduction ...

Reduction was completed in rutile sample before 1180°C whilst in anatase completed at 1230°C. TiN was the final product in both systems after heating to 1400°C. These results are discussed in light of recent work demonstrating the different reductions paths of rutile and anatase.

Structural Aspects of Anatase to Rutile Phase Transition ...

Nov 17, 2016· It was noticed that the crystallite size stays in low values until the beginning of anatase‐to‐rutile phase formation and the peak narrowing is originated from the reduction of the lattice microstrain practically (Figure 4(a)). Thus, the crystallite coalescence occurs as a consequence of the destroying-rebuilt oxygen-metallic cation bonds ...

Role of point defects on the reactivity of reconstructed ...

Jul 30, 2013· It should be mentioned that Ar + sputtering and annealing are commonly used for the reduction of rutile TiO 2 (ref. 1). We believe that a similar treatment is …

The Photocatalytic Reduction of Hexavalent Chromium by ...

The optical bandgap of synthesized titania exhibits a blue shift by 0.3–0.6 eV when compared to the reported value for the bulk anatase and rutile phases. The photocatalytic activity of porous titania is determined with its reduction efficiency of hexavalent chromium (Cr 6+). The reduction efficiency is optimized under ultraviolet ...

Band alignment of rutile and anatase TiO2 | Nature Materials

Jul 07, 2013· A general consensus places the bandgaps of rutile and anatase TiO 2 at 3.03 and 3.20 eV, respectively. In 1996, electrochemical impedance analysis established that the flatband potential of ...

Rutile Titanium Dioxide Prepared by Hydrogen Reduction of ...

The rutile particles were prepared by successive calcination at 900 degrees C and H-2 reduction treatment at 700 degrees C of commercial anatase-rich TiO2 …

Enhanced Photoelectrochemical Performance from …

FTO/rutile/anatase photoanode showed significant perform-ance reduction, and the efficiency loss enlarged with the increase of anatase film thickness. These results can be a valuable guide for designing efficient phase heterojunctions for

Selective Catalytic Reduction of NO Using Phase-Pure ...

We demonstrate a facile selective synthesis of phase-pure anatase, rutile, and brookite nanocrystal polymorphs of titania (TiO2) using a benign hydrothermal treatment of an industrial grade TiOSO4 precursor. Acetic acid (CH3COOH) is used for the synthesis of anatase, glycolic acid (HOCH2COOH) is used for rutile, and both glycolic acid and ammonium hydroxide (NH4OH) are used for obtaining …

Understanding the surface reduction of nano rutile and ...

Jan 01, 2020· TiO 2 nanoparticles underwent Mg reduction process at 450 °C in order to avoid the anatase-to-rutile phase transition. The reduced titania samples were labeled A/R- x corresponding to the initial TiO 2 material of different phases, where A represents anatase, R represents rutile, and x denotes the molar ratio of Mg/TiO 2 .

Heat-stimulated crystallization and phase transformation ...

Oct 02, 2021· The anatase-to-rutile phase transition occurs when the average crystallite size of the anatase reaches the value of 35-45 nm. An explanation for a drastic change of the average crystallite size during the anatase-to-rutile transition repeatedly found in researches is in the difference in shapes of curves of crystallite size distribution.

Rutile and Anatase TiO2 Nanoparticles and Applications ...

Jul 05, 2019· Rutile titanium dioxide is optically positive, whereas Anatase titanium dioxide is optically negative. 4.Occurrences of Anatase and Rutile TiO2 Nanoparticles. Rutile is a type of titanium dioxide that is found naturally in huge quantity as compared to anatase titanium dioxide. 5.UV absorptions of Anatase and Rutile Titanium Oxide Nanoparticles.

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