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  • How the Anatase-to-Rutile Ratio Influences the ...

    Effect of the TiO2 Anatase/Rutile Ratio and Interface for the Oxidative Activation of n-Octane. ACS Catalysis 2020, 10 (3) , 2211-2220. DOI: 10.1021/acscatal.9b04004. Xiandi Zhang, Wei Hao, Chui-Shan Tsang, Mengjie Liu, Gyeong S. Hwang, Lawrence Yoon Suk Lee.

  • Cited by: 220
  • How to calculate the anatase / rutile molar ratio using ...

    Using XRD analysis, the Anatase/Rutile ratio can be found using: 1- The relative intensity method as mentioned by Giunchi. 2- Rietveld refinements method. Cite. 1 Recommendation.

  • Effect of the TiO2 Anatase/Rutile Ratio and Interface for ...

    TiO2 catalysts with a varied composition of anatase and rutile were prepared and tested for the oxidative activation of n-octane. The rutile phase of TiO2 was found to be inactive due to its relatively low reducibility and surface area. The anatase phase, however, was active. Also, a mixture of anatase and rutile, with an excess of rutile, favored the formation of octene isomers during the ...

  • Cited by: 1
  • Mixed Phase Anatase/rutile Titanium Dioxide Nanotubes for ...

    ambient and low temperature. As a result, the anatase/rutile phase composition of the TNTs can be tailored to the needs of later applications. Nanotubes with anatase/rutile mixed phase ratio of 4:1 have been produced in this report and further examined for their

  • Cited by: 54
  • Quantitative Analysis of Anatase-Rutile Mixtures with an X ...

    largely anatase), the weight of R (98.7% Ti02, largely rutile), and the ratio of the intensity of the strongest anatase reflection to that of the strongest rutile reflection for the various sample mix- tures. The last two columns give the weight fraction of anatase and a func- tion of the intensity ratio

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  • Acidic Peptizing Agent Effect on Anatase-Rutile Ratio and ...

    Feb 09, 2018  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.

  • Cited by: 8
  • How the Anatase-to-Rutile Ratio Influences the ...

    In 1991, Bickley et al. proposed a synergetic effect between anatase and rutile in Degussa P25. Since then, there has been an intensive debate about the correctness of this proposal, the origin of the synergism, and the right polymorph composition. However, a comparison of pure titanium dioxide samples with various anatase-to-rutile ratios, but otherwise identical properties, is missing.

  • Cited by: 220
  • Rutile - an overview ScienceDirect Topics

    The various ratios of rutile:anatase in titania support were obtained by calcination of pure anatase titania (obtained from Ishihara Sangyo, Japan) in air at temperatures between 800-1000°C for 4 h. The high space velocity of air flow (16,000 h −1 ) insured the gradual phase transformation to

  • Carbon quantum dots modified anatase/rutile TiO2 ...

    Based on the above discussion, a novel CQDs/A/R-TiO 2 photoanode was designed by growth of anatase TiO 2 nanothorns on rutile TiO 2 nanorods (A/R-TiO 2) and further surface modification of CQDs ().Compared with the pristine TiO 2 at 0.6 V vs. RHE, the photocurrent is increased by 11.72 times and the onset potential is negatively shifted by 240 mV for CQDs/A/R-TiO 2.

  • Anatase - Wikipedia

    Anatase is a metastable mineral form of titanium dioxide (TiO 2).The mineral in natural forms is mostly encountered as a black solid, although the pure material is colorless or white. Two other naturally occurring mineral forms of TiO 2 are known, brookite and rutile.. Anatase is always found as small, isolated and sharply developed crystals, and like the thermodynamically stable rutile (the ...

  • Effect of the TiO2 Anatase/Rutile Ratio and Interface for ...

    TiO2 catalysts with a varied composition of anatase and rutile were prepared and tested for the oxidative activation of n-octane. The rutile phase of TiO2 was found to be inactive due to its relatively low reducibility and surface area. The anatase phase, however, was active. Also, a mixture of anatase and rutile, with an excess of rutile, favored the formation of octene isomers during the ...

  • How the Anatase-to-Rutile Ratio Influences the ...

    Despite a small synergetic ratio regime of anatase to rutile [32], which is also still controversially debated in the literature [29], rutile is known to reduce the photocatalytic efficiency ...

  • Anatase - Wikipedia

    Anatase is a metastable mineral form of titanium dioxide (TiO 2).The mineral in natural forms is mostly encountered as a black solid, although the pure material is colorless or white. Two other naturally occurring mineral forms of TiO 2 are known, brookite and rutile.. Anatase is always found as small, isolated and sharply developed crystals, and like the thermodynamically stable rutile (the ...

  • An Important Factor Affecting the Supercapacitive ...

    Employing a suitable crystal structure can significantly modify the electrochemical performances of materials. Herein, hydrogenated TiO2 nanotube arrays with <001> orientation and different rutile/anatase ratio were fabricated via anodisation, high-temperature annealing and electrochemical hydrogenation. The crystal structure was determined by TEM and X-ray diffraction pattern refinement

  • Influence of the anatase/rutile ratio on the charge ...

    The modification of photo-generated charge transport properties in aligned titanium dioxide nanotubes (TiO 2-NTs) regarding the anatase/rutile ratio was studied by photo-electrochemical methods.TiO 2-NTs obtained by anodization were thermally treated under air flux at different temperatures to significantly modify the proportion of TiO 2 anatase and rutile phases in the tubular structure.

  • Anatase and rutile in evonik aeroxide P25 ...

    The columns in the bottom depict the standard peak position of anatase (red), rutile (black), and α-Li 2 TiO 3 (blue); (b) The variations of weight fraction of anatase and anatase in P25, the formed α-Li 2 TiO 3, the ratio of anatase to rutile (A/R) as a function of hydrothermal reaction time. (For interpretation of the references to colour ...

  • Heating rate dependence of anatase to rutile transformation

    The powder is a mixture of anatase and rutile in the ratio about 3:1, and rutile is present as separate phase and does not exist on the surface of the individual par-ticles of anatase [27]. The existence of two different phases, their unknown precise amount, and the nano-

  • 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.

  • The effect of crystalline phase (anatase, brookite and ...

    The effect of thermal treatment on the morphology (crystalline phase and size) and photocatalytic activity of freshly prepared TiO 2 nano-powder is examined.. Up to 772 K a mixture of brookite and anatase phases was observed, while a mixture of all three phases, i.e. anatase, brookite and rutile, was observed at 872 K, with a rutile only phase at 1097 K and above.

  • Review of the anatase to rutile phase transformation ...

    Such analyses often are done using the method of Spurr and Myers , which utilises the ratio of the rutile (110) peak at 27.355° 2θ to the anatase (101) peak at 25.176° 2θ. The ratio of the intensities of these peaks, I R /I A , is used in the empirically determined formula in Eq.

  • 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].

  • Phase-Pure TiO2 Nanoparticles: Anatase, Brookite and Rutile

    At higher Ti:Cl ratio, pure rutile. ... (anatase/rutile) TiO2 thin film was produced at a substrate temperature of 400 °C when samples are fabricated with anatase and rutile target materials. The ...

  • Graphene Acting as Surface Phase Junction in Anatase ...

    Sep 16, 2014  In this study, an effective anatase–graphene–rutile heterojunction structure was designed and fabricated by using graphene as the surface phase junction between anatase and rutile particles. Results show that both the anatase/rutile ratio (A/R ratio) and graphene amount represent important influence on H 2 production activities of anatase ...

  • Annealing Control on the Anatase/Rutile Ratio of ...

    It was possible to control the anatase/rutile ratio on the nanostructured TiO2 powders from 100% of anatase until a complete transformation to rutile through the variation of the annealing time. The band gap calculated using the Tauc’s model was found in the range of 2.56 to 2.93 eV.

  • An Important Factor Affecting the Supercapacitive ...

    Employing a suitable crystal structure can significantly modify the electrochemical performances of materials. Herein, hydrogenated TiO2 nanotube arrays with <001> orientation and different rutile/anatase ratio were fabricated via anodisation, high-temperature annealing and electrochemical hydrogenation. The crystal structure was determined by TEM and X-ray diffraction pattern refinement

  • Annealing Control on the Anatase/Rutile Ratio of ...

    It was possible to control the anatase/rutile ratio on the nanostructured TiO2 powders from 100% of anatase until a complete transformation to rutile through the variation of the annealing time. The band gap calculated using the Tauc’s model was found in the range of 2.56 to 2.93 eV.

  • Review of the anatase to rutile phase transformation ...

    Such analyses often are done using the method of Spurr and Myers , which utilises the ratio of the rutile (110) peak at 27.355° 2θ to the anatase (101) peak at 25.176° 2θ. The ratio of the intensities of these peaks, I R /I A , is used in the empirically determined formula in Eq.

  • Influence of the anatase/rutile ratio on the charge ...

    The modification of photo-generated charge transport properties in aligned titanium dioxide nanotubes (TiO 2-NTs) regarding the anatase/rutile ratio was studied by photo-electrochemical methods.TiO 2-NTs obtained by anodization were thermally treated under air flux at different temperatures to significantly modify the proportion of TiO 2 anatase and rutile phases in the tubular structure.

  • How can I measure the percentage of Anatase and Rutile ...

    Secondly Rutile and Anatase phases can be differentiated by their XRD profiles. in case if you dont know what is Rietveld refinement and all you can follow relative intensity ratio (RIR) method.

  • Enhanced photocatalytic performance of TiO2 particles via ...

    The ratio of anatase to rutile at 900 C is 92:6,which is comparable to the commercial anatase. The percentage ofcrystalline transformation from anatase to rutile is approximately50% at 950 C and almost complete (100%) at 1000 C. It isclearly indicated that the phase transformation is a linear functionof annealing temperature.

  • Acidic Peptizing Agent Effect on Anatase-Rutile Ratio and ...

    Acidic Peptizing Agent Effect on Anatase-Rutile Ratio and Photocatalytic Performance of TiO2 Nanoparticles Hatem A. Mahmoud1,2*, Katabathini Narasimharao3*, Tarek T. Ali1,3 and Kamal M. S. Khalil1 Abstract TiO 2 nanoparticles were synthesized from titanium isopropoxide by a simple peptization method using sulfuric, nitric, and acetic acids.

  • Graphene Acting as Surface Phase Junction in Anatase ...

    Sep 16, 2014  In this study, an effective anatase–graphene–rutile heterojunction structure was designed and fabricated by using graphene as the surface phase junction between anatase and rutile particles. Results show that both the anatase/rutile ratio (A/R ratio) and graphene amount represent important influence on H 2 production activities of anatase ...

  • Photocatalyst ...

    the presence of anatase or a favorable anatase/rutile ratio. The superior photocatalytic activity of anatase TiO 2 is well established. [16] According to literature reports, anatase exhibits an indirect bandgap in addition to its direct bandgap, which enhances charge carrier lifetime. [17] Anatase TiO 2

  • 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].

  • Synthesis of rutile titania powders: Agglomeration ...

    A[H+]/[Ti] ratio of 10 was found to synthesize titania with a very large rutile to anatase ratio. Lower ratios (0.1, 1) increased the anatase content, while much higher [H+]/[Ti] ratios (40 to 160) did not allow precipitation of titania. With a [H+]/[Ti] ratio of 10 and R 250, it was found that the reaggregation temperature had a significant in-

  • Self-induced synthesis of phase-junction TiO2 with a ...

    The rutile content reduces with the decreasing Ti precusor concentration, while the hydrothermal time and temperature have no distinct effect on the rutile to anatase ratio. The photocatalytic activity of the TiO 2 nanocomposites is significantly affected by the rutile to anatase ratio. A synergy between the two phases within a certain ratio ...

  • Synthesis of TiO2 with controllable ratio of anatase to ...

    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 adsorption–desorption of nitrogen, and scanning/transmission electron ...

  • 1D TiO2 Nanostructures Prepared from Seeds Presenting ...

    TiO 2 nanotubes were synthesized by alkaline hydrothermal treatment of TiO 2 nanoparticles with a controlled proportion of anatase and rutile. Tailoring of TiO 2 phases was achieved by adjusting the pH and type of acid used in the hydrolysis of titanium isopropoxide (first step in the sol-gel synthesis). The anatase proportion in the precursor nanoparticles was in the 3#x2013;100#x0025; range.

  • Annealing Control on the Anatase/Rutile Ratio of ...

    It was possible to control the anatase/rutile ratio on the nanostructured TiO2 powders from 100% of anatase until a complete transformation to rutile through the variation of the annealing time. The band gap calculated using the Tauc’s model was found in the range of 2.56 to 2.93 eV.

  • Acidic Peptizing Agent Effect on Anatase-Rutile Ratio and ...

    Acidic Peptizing Agent Effect on Anatase-Rutile Ratio and Photocatalytic Performance of TiO2 Nanoparticles Hatem A. Mahmoud1,2*, Katabathini Narasimharao3*, Tarek T. Ali1,3 and Kamal M. S. Khalil1 Abstract TiO 2 nanoparticles were synthesized from titanium isopropoxide by a simple peptization method using sulfuric, nitric, and acetic acids.

  • Synthesis of TiO2 with controllable ratio of anatase to ...

    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 adsorption–desorption of nitrogen, and scanning/transmission electron ...

  • Self-induced synthesis of phase-junction TiO2 with a ...

    The rutile content reduces with the decreasing Ti precusor concentration, while the hydrothermal time and temperature have no distinct effect on the rutile to anatase ratio. The photocatalytic activity of the TiO 2 nanocomposites is significantly affected by the rutile to anatase ratio. A synergy between the two phases within a certain ratio ...

  • TiO2-Based Nanomaterials for Gas Sensing—Influence of ...

    Background. Anatase and rutile are the most frequently encountered polymorphic forms of titanium dioxide and usually co-exist for samples prepared in typical technologies such as sputtering [1–4], flame spray synthesis [4–7] and sol-gel [].It has been demonstrated that for the purposes of photocatalysis, a certain ratio of anatase to rutile, corresponding to anatase content extending from ...

  • TiO 2 -Based Nanomaterials for Gas Sensing—Influence of ...

    Anatase and rutile are the most frequently encountered polymorphic forms of titanium dioxide and usually co-exist for samples prepared in typical technologies such as sputtering [1–4], flame spray synthesis [4–7] and sol-gel [].It has been demonstrated that for the purposes of photocatalysis, a certain ratio of anatase to rutile, corresponding to anatase content extending from 40 to 80% ...

  • Controlled fabrication of TiO2 rutile nanorod/anatase ...

    2 rutile nanorods/anatase nanoparticles synthesized under hydrothermal conditions, with the ratio of rutile to anatase controlled simply by adjusting the volume of nitric acid. The as-prepared TiO 2 composites exhibited high specific surface area, light-scattering effect, and good crystallinity. The dye-sensitized solar cells (DSCs) using the TiO

  • 1D TiO2 Nanostructures Prepared from Seeds Presenting ...

    TiO 2 nanotubes were synthesized by alkaline hydrothermal treatment of TiO 2 nanoparticles with a controlled proportion of anatase and rutile. Tailoring of TiO 2 phases was achieved by adjusting the pH and type of acid used in the hydrolysis of titanium isopropoxide (first step in the sol-gel synthesis). The anatase proportion in the precursor nanoparticles was in the 3#x2013;100#x0025; range.

  • Facile Formation of Anatase/Rutile TiO2 Nanocomposites ...

    Comparison of the above results shows that although the P25-TiO 2 has a greater anatase/rutile ratio (87%/13% = 6.39/1), the photodegradation efficiency is less than those of the pH0.5-TiO 2 (30%/70% = 0.43/1) and pH1.0-TiO 2 (31%/69% = 0.45/1) samples, indicating that the presence of an optimum anatase to rutile radio in the biphasic system is ...

  • Synthesis of rutile titania powders: Agglomeration ...

    A[H+]/[Ti] ratio of 10 was found to synthesize titania with a very large rutile to anatase ratio. Lower ratios (0.1, 1) increased the anatase content, while much higher [H+]/[Ti] ratios (40 to 160) did not allow precipitation of titania. With a [H+]/[Ti] ratio of 10 and R 250, it was found that the reaggregation temperature had a significant in-

  • A fast-reliable methodology to estimate the concentration ...

    Along the years, X-ray diffraction (XRD) has been the preferred technique to study TiO 2, efficiently exposing the presence of the Rutile, Anatase, and Brookite phases, their crystal orientation, and the Rutile-to-Anatase ratio. 11 11. D. A. H. Hanaor and C. C. Sorrell, J. Mater. Sci. 46, 855– 874 (2011).

  • Synthesizing and Comparing the Photocatalytic Properties ...

    Ren Su, Ralf Bechstein, Lasse Sø, Ronnie T. Vang, Michael Sillassen, Björn Esbjörnsson, Anders Palmqvist, Flemming Besenbacher, How the Anatase-to-Rutile Ratio Influences the Photoreactivity of TiO 2 , The Journal of Physical Chemistry C, 10.1021/jp2086768, 115, 49, (24287-24292), (2011).

  • Effect of Silica Additive on the Anatase‐to‐Rutile Phase ...

    Dec 20, 2004  The effect of SiO 2 addition on the anatase‐to‐rutile phase transition was investigated by DTA, XRD, FTIR, and XPS. TiO 2 xerogels containing SiO 2 up to 20 mol% were prepared by mixing and hydrolyzing titanium tetraisopropoxide (TTIP) and tetraethylorthosilicate (TEOS) with HNO 3 as a catalyst. With increased amounts of SiO 2 in the xerogels, the following results were obtained: (1) the ...

  • Titanium dioxide nanoparticle - Wikipedia

    ISO/TS 11937 is a metrology standard for measuring several characteristics of dry titanium dioxide powder relevant for nanotechnology: crystal structure and anatase–rutile ratio can be measured using X-ray diffraction, average particle and crystallite sizes using X-ray diffraction or transmission electron microscopy, and specific surface area ...