Using Nano- and Micro-Titanium Dioxide (TiO2) in Concrete to Reduce Air Pollution

Elia, Hala

doi:10.4172/2157-7439.1000505

Cited by 33 publications

(9 citation statements)

References 7 publications

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“…TiO 2 nanoparticles have, in particular, received great interest for the development of various photovoltaic devices, from the dye-sensitized to the perovskite solar cells . They have been widely employed as outstanding photocatalyst systems, − given their high efficiency, low cost, stability, and reusability, finding applications exploiting their antipollution and antibacterial properties. − Also, 1D TiO 2 nanomaterials have stimulated research interest in the energy and environmental fields, given their ability to produce confinement in the radial direction and the tunability of their bandgap via doping with rare-earth metals . However, the employment of bare TiO 2 nanomaterials in photocatalysis is disadvantageous because of their ecotoxicity and the low absorption of visible light, which brings about low efficiency. , For instance, the preparation of composites containing TiO 2 nanoparticles within a polymeric material under selected conditions represents a potential solution to tackle this problem …”

Section: Introductionmentioning

confidence: 99%

Improved Photocatalytic Activity of Polysiloxane TiO₂ Composites by Thermally Induced Nanoparticle Bulk Clustering and Dye Adsorption

et al. 2021

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Fine control of nanoparticle clustering within polymeric matrices can be tuned to enhance the physicochemical properties of the resulting composites, which are governed by the interplay of nanoparticle surface segregation and bulk clustering. To this aim, out-of-equilibrium strategies can be leveraged to program the multiscale organization of such systems. Here, we present experimental results indicating that bulk assembly of highly photoactive clusters of titanium dioxide nanoparticles within an in situ synthesized polysiloxane matrix can be thermally tuned. Remarkably, the controlled nanoparticle clustering results in improved degradation photocatalytic performances of the material under 1 sun toward methylene blue. The resulting coatings, in particular the 35 wt % TiO2-loaded composites, show a photocatalytic degradation of about 80%, which was comparable to the equivalent amount of bare TiO2 and two-fold higher with respect to the corresponding composites not subjected to thermal treatment. These findings highlight the role of thermally induced bulk clustering in enhancing photoactive nanoparticle/polymer composite properties.

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Section: Introductionmentioning

confidence: 99%

Improved Photocatalytic Activity of Polysiloxane TiO₂ Composites by Thermally Induced Nanoparticle Bulk Clustering and Dye Adsorption

et al. 2021

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“…Current proprietary mixes, commercially available in the US and EU markets, have a high content of SCMs. In addition to their strength and durability advantages, SCMs partially reduce the cement consumption and hence reduce the carbon footprint [15][16][17]. Mix design and SCM content in major proprietary mixes are shown in Table 4.…”

Section: Scms In Uhpc Concretementioning

confidence: 99%

Application of Supplementary Cementitious Materials in Precast Concrete Industry

Akhnoukh¹

2022

Sustainability of Concrete With Synthetic and Recycled Aggregates

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Supplementary cementitious materials (SCMs) are increasingly incorporated into the concrete mix design. Silica fume, fly ash, and multi-wall carbon nanotubes are used to improve concrete mix properties. The objective of this chapter is to decipher the impact of different SCMs on the fresh and hardened concrete properties, including concrete flowing ability, initial strength, final strength, modulus of elasticity, and modulus of rupture. In addition, the impact of SCMs on mitigating the alkali-silica reactivity of concrete and increasing the hardened concrete long-term performance is investigated. Developed concrete mixes, incorporating SCMs, are used in fabricating different precast/prestressed bridge girders. The impact of improved concrete properties on precast girder performance in increased flexure, shear, and span-to-depth ratio significantly improves project sustainability and reduces the overall project life cycle cost.

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“…The resulting concrete samples were subjected to sunlight for 24, 48, 72, and 96 hrs. The nano TiO 2 extinguish the organic molecules, by reducing the surface permeability and, as a result, resists certain kinds of air pollution (Elia et al, 2018). The compositions of nano coatings are nano powders dissolved in a fluid to reach an excessive surface area to volume ratio (Birgisson et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Surface Treatment of Cement based Composites: Nano Coating Technique

Ali¹,

Hussain²,

Naje³

2021

JST

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Geometry, size, and shape of the surface pores, as well as, capillarity, and exposure environment are directly influence strength and durability of cementitious composites. The current research aimed to improve the resistance to abrasion and decrease the surface porosity of cement-based composites by nano surface coating technique. All samples were coated with a mixture of methanol alcohol, ordinary Portland cement and nano powder of (TiO2, MgO, ZnO and ZrO2) separately in percentages of (1, 1.5, and 2 %) by weight of cement. The hardness, abrasion, water absorption, density, porosity, and microstructural analysis: Scanning Electron Microscopy and X-Ray Diffraction (SEM & XRD) were studied for all coated and control specimens. Results showed an improvement in mechanical properties for all coated specimens as compared to control. The highest Vickers micro hardness value had reached 29%, while the largest value of abrasion resistance had increased by 39% for coated samples with 2% ZrO2. Also, the results showed a reduction in the porosity and water absorption of all coated samples, having highest scores obtained from the coated samples with 2% MgO. While the total water absorption rate decreased by 45% and the density had increased by 1% and the porosity had decreased by 46%. Additionally, the results of microstructural tests revealed pattern and images for each of SEM and XRD. Also, results indicated that the nano coating leads to significant consumption of Portlandite (CH) associated with production of a stable structure of CSH and reduction of voids, and this is evident from the enhancement in the physical properties.

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Using Nano- and Micro-Titanium Dioxide (TiO2) in Concrete to Reduce Air Pollution

Abstract: Nanomedicine & Nanotechnology J o ur nal of N a n o m ed icine & N a n o te chnolo g y

Cited by 33 publications

References 7 publications

Improved Photocatalytic Activity of Polysiloxane TiO₂ Composites by Thermally Induced Nanoparticle Bulk Clustering and Dye Adsorption

Improved Photocatalytic Activity of Polysiloxane TiO₂ Composites by Thermally Induced Nanoparticle Bulk Clustering and Dye Adsorption

Application of Supplementary Cementitious Materials in Precast Concrete Industry

Surface Treatment of Cement based Composites: Nano Coating Technique

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Using Nano- and Micro-Titanium Dioxide (TiO2) in Concrete to Reduce Air Pollution

Abstract: Nanomedicine & Nanotechnology J o ur nal of N a n o m ed icine & N a n o te chnolo g y

Cited by 33 publications

References 7 publications

Improved Photocatalytic Activity of Polysiloxane TiO2 Composites by Thermally Induced Nanoparticle Bulk Clustering and Dye Adsorption

Improved Photocatalytic Activity of Polysiloxane TiO2 Composites by Thermally Induced Nanoparticle Bulk Clustering and Dye Adsorption

Application of Supplementary Cementitious Materials in Precast Concrete Industry

Surface Treatment of Cement based Composites: Nano Coating Technique

Contact Info

Product

Resources

About

Improved Photocatalytic Activity of Polysiloxane TiO₂ Composites by Thermally Induced Nanoparticle Bulk Clustering and Dye Adsorption

Improved Photocatalytic Activity of Polysiloxane TiO₂ Composites by Thermally Induced Nanoparticle Bulk Clustering and Dye Adsorption