Microstructural and photocatalytic characterization of cement-paste sol-gel synthesized titanium dioxide

Cerro‐Prada, Elena; Manso, M.; Torres, Vicente; Soriano, Jesús

doi:10.1007/s11709-015-0326-6

Cited by 29 publications

(18 citation statements)

References 19 publications

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“…The authors have already reported photocatalytic studies on nano-TiO 2 -cementitious materials, specifically cement paste with addition of nano sol-gel TiO 2 [16]. In such study, the same sol-gel procedure was used to synthesizing the titania nanoparticles, although the photocatalytic sols had none or poor crystallinity because controlled annealing was then not performed, as that is now the aim of this work.…”

Section: Resultsmentioning

confidence: 99%

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Controlled Synthesis and Microstructural Properties of Sol-Gel TiO2 Nanoparticles for Photocatalytic Cement Composites

et al. 2018

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Titania nanoparticles are intensely studied for photodegradation applications. Control of nanoscale morphology and microstructural properties of these materials is critical for photocatalytic performance. Uniform anatase-type TiO2 nanoparticles were prepared by the sol-gel process using titanium isopropoxide as precursor. Controlled annealing up to 400 °C established crystallization and particle size ranging between 20 and 30 nm. Detailed thermal examination reveals that anatase phase transformation into rutile is affected by the annealing temperature and by the initial particle size. The anatase to rutile phase transformation occurs in the nanoparticles at 550 °C. The Total Reflection X-ray Fluorescence (TXRF) study of the anatase nanoparticles shows a shift towards higher energy in the Ka Ti line of 10 eV, related to structural defects. These features were discussed in the photocatalytic behavior of several cement-based materials modified with the so-prepared anatase nanoparticles. The photocatalytic activity of the anatase-type TiO2/cement mortar system is evaluated from the degradation of Methylene Blue (MB) under UV irradiation, monitored through the absorbance at 665 nm. The results show that the photocatalytic composites exhibit up to 76.6% degradation efficiency. Mechanical testing of the nano-TiO2 modified cementitious composites evinces a moderate reinforcement of the strength properties at long ages.

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Section: Resultsmentioning

confidence: 99%

“…Additionally, titania nanoparticles have unique physical properties that can add smart functionality to cementitious materials beyond the photocatalytic properties. Hence, there is a synergistic effect between nano-TiO 2 and cement that suggests an emergent self-assembly route for functionalized cement engineering [16].…”

Section: Introductionmentioning

confidence: 99%

Controlled Synthesis and Microstructural Properties of Sol-Gel TiO2 Nanoparticles for Photocatalytic Cement Composites

et al. 2018

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“…In this sense, Jayapalan et al [8] reported an increasing effect in the rate of early age hydration proportional to the dosage of TiO 2 , as well as found that smaller particles seem to accelerate the reaction more than larger particles. While in this and other reported studies TiO 2 particles were added as TiO 2 nanopowder and mixed with water prior to the addition of cement, researchers have recently being investigating the effects on the microstructure and photocatalytic activity of cement pastes doped with nanosized TiO 2 prepared by other techniques; as, for example, sol-gel method [9].…”

Section: Influence Of Nanosized Tio 2 On Cement Hydrationmentioning

confidence: 99%

Cement Microstructure: Fostering Photocatalysis

Cerro‐Prada¹

2018

Cement Based Materials

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The singularities and the qualities of the hydrated cement microstructure have been identified by researchers as enhancers to promote photocatalytic processes, mediated by titanium dioxide, to create environment-friendly cement. In this chapter, we intend to expose the microstructural characteristics of cement and those aspects that make it possible for the promotion of photocatalytic activity. Within the inherent complexity of the cement microstructure, we describe a framework of two key elements in the microstructure of this material that affects the promotion of TiO 2 photocatalysis, to offer a more comprehensive view of the physical-chemical processes involved. These elements are: the porosity and the nanostructure of the C-S-H. This framework is also a starting point for future studies that seek to improve the photocatalytic response of titanium dioxide inserted in the cement matrix, as well as to provide implications for the application of photocatalytic cement technology in the construction materials industry.

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“…The removal of NO x caused by the photocatalytic reaction is illustrated in Figure 3 . Some of the most recent tests on this topic include those carried out by Cerro-Prada et al [ 95 ] and Ganji et al [ 96 ]. Cerro-Prada used Methylene Blue as the organic dye, while Ganji used malachite green—which is severely toxic and difficult to remove from aqueous solutions.…”

Section: Nanoinclusionsmentioning

confidence: 99%

Nano-Inclusions Applied in Cement-Matrix Composites: A Review

et al. 2016

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Research on cement-based materials is trying to exploit the synergies that nanomaterials can provide. This paper describes the findings reported in the last decade on the improvement of these materials regarding, on the one hand, their mechanical performance and, on the other hand, the new properties they provide. These features are mainly based on the electrical and chemical characteristics of nanomaterials, thus allowing cement-based elements to acquire “smart” functions. In this paper, we provide a quantitative approach to the reinforcements achieved to date. The fundamental concepts of nanoscience are introduced and the need of both sophisticated devices to identify nanostructures and techniques to disperse nanomaterials in the cement paste are also highlighted. Promising results have been obtained, but, in order to turn these advances into commercial products, technical, social and standardisation barriers should be overcome. From the results collected, it can be deduced that nanomaterials are able to reduce the consumption of cement because of their reinforcing effect, as well as to convert cement-based products into electric/thermal sensors or crack repairing materials. The main obstacle to foster the implementation of such applications worldwide is the high cost of their synthesis and dispersion techniques, especially for carbon nanotubes and graphene oxide.

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Microstructural and photocatalytic characterization of cement-paste sol-gel synthesized titanium dioxide

Cited by 29 publications

References 19 publications

Controlled Synthesis and Microstructural Properties of Sol-Gel TiO2 Nanoparticles for Photocatalytic Cement Composites

Controlled Synthesis and Microstructural Properties of Sol-Gel TiO2 Nanoparticles for Photocatalytic Cement Composites

Cement Microstructure: Fostering Photocatalysis

Nano-Inclusions Applied in Cement-Matrix Composites: A Review

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