Catalytically Active Composite Material Based on TiO2/Cr2O3 Hollow Spherical Particles

Rogacheva, A. O.; Buzaev, A. A.; Brichkov, Anton S.; Khalipova, O. S.; Klestov, S. A.; Paukshtis, E. A.; Козик, В. В.

doi:10.1134/s002315841904013x

Cited by 5 publications

(4 citation statements)

References 19 publications

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“…The preparation of composites based on MoO 3 /TiO 2 -SiO 2 with spherical shape of agglomerates was done according to the procedure, which was proposed in our previous works [5,7]. In the first step, TOKEM-320Y and TOKEM-400 anion-exchange resins preliminarily loaded with Mo 7 O 6− 24 ions were prepared.…”

Section: Preparation Of Compositesmentioning

confidence: 99%

“…Hollow spheres of metal oxides are intensively investigated for applications, such as controlled release capsules for drugs, fillers, filters [1], gas sensitive materials [1,2], absorbents and separation materials, especially for fixed-bed reactors or chromatography columns [3]. In recent years, hollow spheres of metal oxides have also been intensively investigated for applications as catalysts [3][4][5][6][7]. This is because metal oxide with hollow micro and nanospheres only has low density and good porous structure (usually contain both mesopores and macropores [3]), but also provides a high surface area with more active acid-base oxide centers on the pore surface [4].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of nanostructured composite materials of MoO3/TiO2-SiO2 with spherical shape prepared with resins

Кузнецова¹,

Khalipova²,

Lisitsa³

et al. 2021

Nanosystems: Phys. Chem. Math.

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The aim of this work was to synthesize of nanostructured MoO 3 /TiO 2 -SiO 2 composites with hollow spherical shape by thermal decomposition of anion exchangers saturated with Mo 7 O 6− 24 ions and treated with the TBT-TEOS sol. The effect of the kinetics (Kissinger and the Metzger-Horowitz methods) of thermal decomposition of resins of porous and gel structures on the size of MoO 3 nanoparticles and the strength of MoO 3 /TiO 2 -SiO 2 spheres was shown. The formation of dense spherical nanostructured agglomerates of the composite is facilitated by reactions occurring at the interface between the phases of cylindrical and spherical symmetry when using an anion exchange resin with a porous structure. The decomposition reactions of the anion-exchange resin of the gel structure, accompanied by random nucleation, lead to the formation of hollow spherical agglomerates of the composite with cracks on the surface. The materials were characterized by DSC-TGA, XRD and SEM.

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Section: Preparation Of Compositesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of nanostructured composite materials of MoO3/TiO2-SiO2 with spherical shape prepared with resins

Кузнецова¹,

Khalipova²,

Lisitsa³

et al. 2021

Nanosystems: Phys. Chem. Math.

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“…The preparation of MoO 3 /TiO 2 -SiO 2 composites with spherical shape was done according to the procedure, which was proposed in our previous works. 5,20 The scheme of hollow spherical MoO 3 /TiO 2 -SiO 2 composites preparation is shown in the Figure 1.…”

Section: рReparation Of Compositesmentioning

confidence: 99%

Fabrication of MoO₃/TiO₂‐SiO₂ with hollow spherical shape using resin as the template: Effect of decomposition of resins

Кузнецова

Khalipova

Lisitsa

et al. 2021

J of Applied Polymer Sci

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Anion exchange resins are widely used in template synthesis of oxide composites. The present work is aimed to study the thermal destruction of anion exchangers with divinyl-benzene and polyacrylate matrices in order to obtain hollow spherical MoO 3 /TiO 2 -SiO 2 composites from these resins preliminarily saturated with paramolybate ion and coated with tetrabutoxytitanium sol with tetroethoxysilane. It is shown that the processes of resins decomposition affect the strength of spherical composites. Decomposition of the resin with a polyacrylate matrix, accompanied by random nucleation and burnout of the organic matrix at 350 C, leads to the formation of spherical oxide composites with cracks on the surface. The decomposition reactions of the resin with a divinylbenzene matrix occurring at the boundaries of the phases of cylindrical and spherical symmetry, as well as a lower burnout temperature of the organic matrix (290 C), contribute to the formation of dense MoO 3 /TiO 2 -SiO 2 spheres. Hollow spherical composites 0.3-0.5 mm in size are orthorhombic α-MoO 3 coated with a mixture of titanium dioxide with anatase structure and amorphous silicon dioxide.

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“…The nanoscale TiO 2 hollow sphere [ 82 ] structure can be regarded as a special core‐shell structure, equivalent to air as the core, [ 83 ] according to the number of shells can be divided into single shell layer and multi‐shell layer. [ 84,85 ] Because of its high specific surface area and effective particle density, and the most important thing is that the hollow sphere can improve the utilization of light sources through internal refraction, [ 86 ] so nanoscale TiO 2 hollow sphere has excellent photocatalytic performance.…”

Section: Synthesis Of Nanoscale Spherical Tio2mentioning

confidence: 99%

Progress on the nanoscale spherical TiO₂ photocatalysts: Mechanisms, synthesis and degradation applications

et al. 2020

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Titanium dioxide (TiO2) has the advantages of strong photocatalytic activity, non‐toxicity, and low cost, and so on. It has always occupied a dominant position in many photocatalytic materials, especially nanoscale spherical TiO2 has the characteristics of high specific surface area and pore‐volume, and so on. Therefore, Degussa P25, as a typical representative of the nanoscale spherical structure, is currently the only material produced on a large scale. According to the structure, nanoscale spherical TiO2 can be divided into three types: solid, core‐shell, and hollow spheres. However, there is still a lack of the latest review on the synthetic doping and application of nanoscale spherical TiO2. Therefore, we first describe the degradation mechanism of nanoscale spherical TiO2 and summarize the latest progress of its synthesis strategy in this review, including doping and other modification techniques, and finally introduce the application of nanoscale spherical TiO2 photocatalytic degradation of volatile organic compounds, dye wastewater, antibiotics, pesticides, and oily wastewater. Through this review, it is helpful for researchers to further understand the synthesis and application of nanoscale spherical TiO2, hoping to continuously improve the disadvantages and photocatalytic activity of nanoscale spherical TiO2, and promote the widespread application of nanoscale spherical TiO2 on an industrial scale.

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Catalytically Active Composite Material Based on TiO2/Cr2O3 Hollow Spherical Particles

Cited by 5 publications

References 19 publications

Synthesis of nanostructured composite materials of MoO3/TiO2-SiO2 with spherical shape prepared with resins

Synthesis of nanostructured composite materials of MoO3/TiO2-SiO2 with spherical shape prepared with resins

Fabrication of MoO₃/TiO₂‐SiO₂ with hollow spherical shape using resin as the template: Effect of decomposition of resins

Progress on the nanoscale spherical TiO₂ photocatalysts: Mechanisms, synthesis and degradation applications

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Catalytically Active Composite Material Based on TiO2/Cr2O3 Hollow Spherical Particles

Cited by 5 publications

References 19 publications

Synthesis of nanostructured composite materials of MoO3/TiO2-SiO2 with spherical shape prepared with resins

Synthesis of nanostructured composite materials of MoO3/TiO2-SiO2 with spherical shape prepared with resins

Fabrication of MoO3/TiO2‐SiO2 with hollow spherical shape using resin as the template: Effect of decomposition of resins

Progress on the nanoscale spherical TiO2 photocatalysts: Mechanisms, synthesis and degradation applications

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Fabrication of MoO₃/TiO₂‐SiO₂ with hollow spherical shape using resin as the template: Effect of decomposition of resins

Progress on the nanoscale spherical TiO₂ photocatalysts: Mechanisms, synthesis and degradation applications