anatase rutile ratio

Assessing the amount of the anatase and rutile phases of TiO

The anatase (A) and rutile (R) phases of a series of titanium dioxide (TiO 2) samples were investigated by optical diffuse reflectance spectroscopy.The samples consisted of commercial A and R high-purity TiO 2 powders mixed together according to the R mass /(R mass + A mass) rutile mass ratio.The optical reflectance spectra of the A + …

Phase quantification by X-ray photoemission valence band analysis

A method of quantitative phase analysis using valence band X-ray photoelectron spectra is presented and applied to the analysis of TiO 2 anatase-rutile mixtures. The valence band spectra of pure TiO 2 polymorphs were measured, and these spectral shapes used to fit valence band spectra from mixed phase samples. Given the …

Why is anatase a better photocatalyst than rutile?

The prototypical photocatalyst TiO2 exists in different polymorphs, the most common forms are the anatase- and rutile-crystal structures. Generally, anatase is more active than rutile, but no ...

Acidic Peptizing Agent Effect on Anatase-Rutile Ratio and

The results confirmed that the TiO2 sample peptized using nitric acid (with rutile and anatase phases in 3:1 ratio) offered the highest activity for degradation of organic dyes, although, TiO2 samples peptized using sulfuric acid and acetic acid possessed smaller particle size, higher band gap energy, and high surface area.

Band alignment of rutile and anatase TiO2

To aid this peak fitting, samples were produced with a 2:1, 1:1 and 1:2 ratio of rutile to anatase. Full details of this procedure are given in the Supplementary Information. The anatase valence ...

Applied Sciences | Free Full-Text | Enhancement of Visible …

The formation of TiO2 consisting of different ratios of anatase and rutile phases was controlled by two parameters: the acetylene flow rate (C2H2, 600 sccm and 800 sccm) and the acetylene/oxygen flow ratio (C2H2/O2, 1:3, 1:4, 1:5, and 1:6). The location of the photonic center was identified for visible-light absorption, which is in the anatase ...

Morphology of a TiO2 Photocatalyst (Degussa, P-25) …

The TiO 2 powder (Degussa, P-25), which is a standard material in the field of photocatalytic reactions, contains anatase and rutile phases in a ratio of about 3 : 1. Transmission electron microscopy showed that the anatase and rutile particles separately form their agglomerates. The average sizes of the anatase and rutile elementary …

Synthesis of TiO2 with controllable ratio of anatase to rutile

Dual-phase TiO 2 photocatalysts with controllable ratio of anatase to rutile were synthesized, and evaluated using the degradation of Rhodamine B (RhB) under UV light irradiation. The TiO 2 samples prepared by one-pot redox reactions in the presence of graphene oxide (GO) were characterized by X-ray diffraction, physical …

Controllable One-Step Synthesis of Mixed-Phase TiO2 …

In this study, the novel mixed-phase TiO 2 nanocrystals (s-TiO 2) with nearly equivalent anatase/rutile ratio were fabricated in the reagent of sec-butanol at the relatively low temperature of 80 °C by using a facile one-step condensing reflux method.The photocatalytic water splitting hydrogen production performance of s-TiO 2 nanocrystals is close to that …

Anatase-to-Rutile Phase Transition in TiO

The light-induced phase transition of TiO2 nanoparticles from anatase to rutile structure is reported depending on the surrounding environment, the transition being accomplished under oxygen-poor c...

Crystalline phase regulation of anatase–rutile TiO

The anatase and rutile contents in biphasic TiO 2 were adjusted by controlling different volumes of H 2 O 2. ... By changing the H 2 O 2 volume, the ratio of anatase and rutile in the biphasic TiO 2 was adjusted. The content of anatase TiO 2 and its photocatalytic activity improved with the addition of H 2 O 2.

Anatase and Rutile TiO2 Nanoparticles Lead Effective Bone …

Anatase and rutile TiO 2 NPs are the only commercially available crystal forms, 6 both of which have been approved for use in the food industry. 13 Anatase TiO 2 NPs and rutile TiO 2 NPs have ... (P>0.05). The Ca/P ratio was not statistically significant in the exposure groups (P>0.05, Figure 3C). These results do not suggest that TiO 2 NPs …

Photocatalytic nanocomposite anatase–rutile TiO 2 coating

The nanocomposite TiO 2 coatings composed of 10 nm crystallinities with anatase/rutile ratio varying between 0 and 30 mol% were prepared on glass substrates via the spray-plasma deposition method and controlled via oxygen gas flow in plasma. The coatings formed strong covalent bonds (O)3≡Ti–Si≡ (O)3 and (O)3≡Si–O–Ti≡ (O)3 with …

Anatase/rutile TiO2 composites: Influence of the …

Introduction. The present study is aimed to investigate the influence of the anatase/rutile ratio in TiO 2 powders, prepared from KRONOS brands, on the …

Band alignment of rutile and anatase TiO2 | Nature …

To aid this peak fitting, samples were produced with a 2:1, 1:1 and 1:2 ratio of rutile to anatase. Full details of this procedure are given …

Influence of N sources on the photocatalytic activity of N-doped …

It is also claimed that the anatase–rutile ratio can be tuned to some extent by adjusting the factors such as synthetic method, precursor material, ... Other than the presence of nitrogen, a large surface area, smaller size and a critical rutile-anatase couple helps in enhancing visible light photocatalytic activity of N-TiO 2. The present ...

X-ray diffraction pattern of titanium dioxide phases: (a) anatase…

The anatase/rutile ratios for Ti30 and Ti100 particles were found to be 91:9 and 81:19, respectively. ... Effect of real food matrix on the behavior and toxicity of TiO2 nanoparticles.

Anatase-to-Rutile Phase Transition in TiO

Assessing the amount of the anatase and rutile …

The optical bandgaps of the A + R TiO 2 mixtures were also determined and correlated with the rutile mass ratio. In its current form, this work shows the potential of …

Visible Light-Responsive N-Doped TiO2 Photocatalysis: …

The yield of KA oil (cyclohexanol and cyclohexanone) reached 112.44 µmol after 5-h illumination of the photocatalyst with the optimal N-doped anatase/rutile ratio, which was 5.66 and 39.87 times that of N-doped anatase TiO 2 and N-doped P25, respectively. In the meantime, the selectivity toward cyclohexanone could reach .

Crystalline Mixed Phase (Anatase/Rutile) Mesoporous

It has a mixed phase of anatase and rutile with a ratio of 80% and 20%, respectively [195]. At semiconductor heterojunctions, energy bands of two different materials come together, leading to an ...

Influence of Anatase-Rutile Ratio on Band Edge Position …

(a) Band edge shift due to electric fields of dipoles, (b) Schematic band alignment between anatase and rutile TiO 2 with different phase ratio, (c) Relative band position and charge transfer in TiO 2 mixed phase catalyst during photocatalysis, (d) Change in defect staet (D s) at 1.9 eV with annealing temperature.

Review of the Anatase to Rutile Phase Transformation

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 ...

Titanium(IV) oxide

The remaining was assumed as an NC phase, and the anatase-rutile-NC ratio was determined to be 78:14:8, but this result requires the following caution. It can be clearly seen that there is an appreciable fluctuation in the compositions even if the P25 powder was collected from the same package. In particular, the fluctuation in the NC ...

Tuning anatase and rutile phase ratios and nanoscale …

R.S. Williamson., I.P. Blakely., L.M. Didier. Add to Mendeley. https://doi/10.1016/j.msec.2015.08.028 Get rights and content. •. Anodization process …

Impact of rutile fraction on TiO2 visible-light absorption …

rutile−anatase mixture would improve visible-light absorption. In this research paper we thoroughly ... To get different anatase-to-rutile-to-amorphous ratios, dried gels were thermally treated at different temperatures, with different dwell times, always under a static air flow, and using an electric muffle furnace. In detail: samples were ...

Self-induced synthesis of phase-junction TiO2 with a tailored rutile …

Figure 8 shows that the H 2 evolution rate changed with the rutile to anatase ratio and the H 2 evolution rate of the phase-junction TiO 2 was greater than those of the anatase (W5) and rutile (W6 ...

Comparative study of the effects of anatase and rutile …

The anatase and rutile titanium dioxide (TiO 2) were prepared and characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscope and UV–vis spectrophotometer.Then they were introduced into waterborne polyurethane (WPU) to prepare hybrid films. The effects of anatase and rutile TiO 2 on …

How the hydroxylation state of the (110)-rutile TiO

1 Introduction Since the discovery by Fujishima and Honda 1 of the photocatalytic ability of titanium dioxide, TiO 2, this system has been extensively studied for hydrogen fuel production through water splitting. 2 Although the anatase TiO 2 was found to be the polymorph with the most photocatalytic efficiency, the (110)-rutile surface has become …

Self-induced synthesis of phase-junction TiO2 with a …

The results suggest that an appropriate ratio of anatase to rutile in the TiO 2 nanocomposite can create more efficient solid-solid interfaces upon calcination, thereby …