Immobilization of photocatalytically active TiO 2  nanopowder by high shear granulation

Goedecke, Caroline; Sojref, Regine; Nguyen, Thi Yen; Piechotta, Christian

doi:10.1016/j.powtec.2017.06.025

Cited by 5 publications

(3 citation statements)

References 14 publications

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“…The uneven structure of the TiO 2 layer in the smaller fraction granules explained these results. The photocatalytic of TiO 2 -coated granules remained nearly the same after recycling by washing with ultrapure water and drying [ 75 ].…”

Section: Tio 2 Microscale Structuresmentioning

confidence: 99%

Titanium Dioxide Microscale and Macroscale Structures: A Mini-Review

et al. 2020

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Titanium dioxide nanoparticles (TiO2 NPs) have some limitations, such as their low surface area, high bandgap energy, and low recycling ability. To overcome these limitations, TiO2 can be prepared in microscale/macroscale structures. TiO2 microscale structures, in comparison with TiO2 nanopowder, have higher surface areas, more tunable pore structures, and better top photocatalytic activity. In contrast, for TiO2 macroscale structures, although the surface area is lower than TiO2 nanopowder in many cases, they still achieve similar or better photocatalytic performance due to their unique properties. Moreover, both TiO2 microscale and macroscale structures can be easily recovered from reaction media. The difference between these two types of TiO2 structures is a function not only of size but also of the preparation process. Every type of TiO2 structure has its own advantages and disadvantages, as will be discussed further in the following pages. Future perspectives on this research field also will be discussed.

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Section: Tio 2 Microscale Structuresmentioning

confidence: 99%

Titanium Dioxide Microscale and Macroscale Structures: A Mini-Review

et al. 2020

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“…Normally, these charge carrier pairs recombine very quickly; however, due to the band bending in the area of the surface, charge carriers can be separated. These generally react with adsorbed oxygen and water to form hydroxyl and peroxy radicals to degrade or damage polymer-based materials and their additives [24].…”

Section: Uv Radiation In Terms Of Photocatalysis or Photocatalytic Efmentioning

confidence: 99%

Using Environmental Simulations to Test the Release of Hazardous Substances from Polymer-Based Products: Are Realism and Pragmatism Mutually Exclusive Objectives?

et al. 2020

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The potential release of hazardous substances from polymer-based products is currently in the focus of environmental policy. Environmental simulations are applied to expose such products to selected aging conditions and to investigate release processes. Commonly applied aging exposure types such as solar and UV radiation in combination with water contact, corrosive gases, and soil contact as well as expected general effects on polymers and additional ingredients of polymer-based products are described. The release of substances is based on mass-transfer processes to the material surfaces. Experimental approaches to investigate transport processes that are caused by water contact are presented. For tailoring the tests, relevant aging exposure types and release quantification methods must be combined appropriately. Several studies on the release of hazardous substances such as metals, polyaromatic hydrocarbons, flame retardants, antioxidants, and carbon nanotubes from polymers are summarized exemplarily. Differences between natural and artificial exposure tests are discussed and demonstrated for the release of flame retardants from several polymers and for biocides from paints. Requirements and limitations to apply results from short-term artificial environmental exposure tests to predict long-term environmental behavior of polymers are presented.

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“…Goedecke and collaborators concluded in their research that the particle size of TiO2 directly influences the efficiency of the photocatalytic process. It was observed that there was a complete discoloration of a methylene blue solution applying particles in a range of 20 nm ≤ dp ≤ 50 nm, compared to only 60% of dye removal (approximately) when use the bigger ones (200 nm ≤ dp ≤ 400 nm) [7]. In the grinding process, for example, products can be influenced by several factors that imply grain size and formation of new compounds, such as the type of mill, the composition of the bowl and the grinding balls, the rotation speed, the grinding time, the mass ratio between grinding balls and processed sample, the grinding atmosphere, process controlling agents , the filled volume of the grinding vessel and the temperature of the grinding medium.…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical Synthesis of Anatase-Rutile Phases at Ball Milling in Different Conditions and Its Cause and Effect on a Photo-Oxidation Process / Síntese Mecano-Química De Fases Anatômicas Na Moagem De Bolas Em Diferentes Condições E Sua Causa E Efeito Em Um Processo De Foto-Oxidação

Vicentini

Subtil

Oliveira

et al. 2021

BJD

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This study aims to evaluate the effect of the grinding parameters applied to TiO2 comminution, which forms a heterojunction of anatase-rutile phases and reduces markedly the size particle. This material is a well-knowm photocatalyst in environmental issues such as degradation of synthetic dyes, mainly due to the large surface area and oxidative radicals generations ability. The influence of time, rotational speed and the solvent was investigated in the grinding process. Catalysts were prepared by a deposition method and were characterized by XRD, textural analysis (BET area), potential electrophoretic, photoacoustic and Mössbauer spectroscopy. The comminution procedure reduced the size of TiO2 crystallites from 87 nm to 22 nm as well as the surface area and pore diameter. The best photocatalytic activity was for TiO2 comminuted for 10 min and 300 rpm in a dry medium supported on ZSM-5. It was registered that the photoactivity of TiO2 decreased with the transition of anatase to rutile phase and also by the iron oxides insertion during the comminution process. This study has a great technologic contribution because it elucidates primary issues on the particle sizes reduction in the catalysts production, whose function is to have a better metal distribution on the support's surface.

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Immobilization of photocatalytically active TiO 2 nanopowder by high shear granulation

Cited by 5 publications

References 14 publications

Titanium Dioxide Microscale and Macroscale Structures: A Mini-Review

Titanium Dioxide Microscale and Macroscale Structures: A Mini-Review

Using Environmental Simulations to Test the Release of Hazardous Substances from Polymer-Based Products: Are Realism and Pragmatism Mutually Exclusive Objectives?

Mechanochemical Synthesis of Anatase-Rutile Phases at Ball Milling in Different Conditions and Its Cause and Effect on a Photo-Oxidation Process / Síntese Mecano-Química De Fases Anatômicas Na Moagem De Bolas Em Diferentes Condições E Sua Causa E Efeito Em Um Processo De Foto-Oxidação

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