Developing scenario of titania-based building materials for environmental remediation

Ghosh, Sandipta; Patra, Rishik; Majumdar, D.; Sen, Kamalika

doi:10.1007/s13762-020-02952-1

Cited by 10 publications

(4 citation statements)

References 112 publications

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“…The vapor recovery agent, which is coupled with the vapor-suppressing scheme, can enhance the suppressing performance of VOC-contaminated soil [ 32 ]. As a novel vapor recovery material, nano titanium dioxide(nano-TiO 2 ) possesses the capacity to decompose VOCs because of its photocatalysis performance [ 33 ]. In a bench-scale experiment, a SiO 2 core–TiO 2 shell composite nanoparticle was shown to enhance the photocatalysis of nano-TiO 2 [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

SiO2–TiO2 Nanoparticle Aqueous Foam for Volatile Organic Compounds’ Suppression

Yu,

Xuan

2024

Toxics

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Volatile organic compounds (VOCs) are prevalent soil contaminants. During the ex situ soil remediation process, VOCs may overflow from the soil and cause gas to diffuse into the atmosphere. Moreover, some VOCs, such as trichloromethane, are categorized by the EPA as emerging contaminants, imparting toxicity to organs, and the endocrine and immune systems, and posing a huge threat to human health and the environment. To reduce VOCs’ emissions from contaminated soil, aqueous foam suppression is a prospective method that provides a durable mass transfer barrier for VOCs, and it has been widely used in odor control. Based on an aqueous foam substrate, in order to enhance the foam’s stability and efficiency of suppression, SiO2–TiO2-modified nanoparticles have been used as stabilizing agents to improve the mechanical strength of liquid film. The nanoparticles are endowed with the ability to photocatalyze after the introduction of titanium dioxide. From SEM imaging, IR, and a series of morphological characterization experiments, the dispersibility of the SiO2–TiO2-modified nanoparticles was significantly improved under the polar solvent, which, in turn, increased the foam duration. The foam dynamic analysis experiments showed that the foam liquid half-life was increased by 4.08 h, and the volume half-life was increased by 4.44 h after adding the novel synthesized nanoparticles to the bulk foam substrate. From the foam VOC suppression test, foam with modified nanoparticles was more efficient in terms of VOCs’ suppression, in contrast with its nanoparticle-free counterparts, due to the longer retention time. Moreover, in a bench-scale experiment, the SiO2–TiO2 nanoparticles foam worked against dichloroethane, n–hexane, and toluene for almost 12 h, with a 90% suppression rate, under UV irradiation, which was 2~6 h longer than that of UV-free SiO2–TiO2 nanoparticles, the KH–570-modified nanosilica foam, and the nanoparticle-free bulk foam. XPS and XRD results indicate that in SiO2–TiO2 nanoparticles, the proportion of titanium valence was changed, providing more oxygen vacancies compared to raw titanium dioxides.

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Section: Introductionmentioning

confidence: 99%

SiO2–TiO2 Nanoparticle Aqueous Foam for Volatile Organic Compounds’ Suppression

Yu,

Xuan

2024

Toxics

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“…The general action mechanism of these catalysts involves utilizing light to create radical species that, through chemical oxidation, break down contaminants and eliminate them. The resulting decomposition product is carried away by moisture or rainfall [26]. The photocatalytic properties of TiO 2 in removing dirt are well-known, and its use offers several advantages, such as low toxicity, high compatibility with construction materials, and superior catalytic activity compared with other metal oxides [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

“…The resulting decomposition product is carried away by moisture or rainfall [26]. The photocatalytic properties of TiO 2 in removing dirt are well-known, and its use offers several advantages, such as low toxicity, high compatibility with construction materials, and superior catalytic activity compared with other metal oxides [26][27][28]. However, it faces several challenges, including cost, a limited ability to absorb non-ultraviolet visible sunlight [26,27,29], and its primary use in bulk applications rather than coatings (resulting in the waste of photocatalyst within the internal mass of the construction material or limiting its application to new structures, thereby reducing its potential to transform existing structures into decontaminating areas).…”

Section: Introductionmentioning

confidence: 99%

“…The photocatalytic properties of TiO 2 in removing dirt are well-known, and its use offers several advantages, such as low toxicity, high compatibility with construction materials, and superior catalytic activity compared with other metal oxides [26][27][28]. However, it faces several challenges, including cost, a limited ability to absorb non-ultraviolet visible sunlight [26,27,29], and its primary use in bulk applications rather than coatings (resulting in the waste of photocatalyst within the internal mass of the construction material or limiting its application to new structures, thereby reducing its potential to transform existing structures into decontaminating areas). Given these factors, which significantly reduce its efficiency, two possible solutions arise: (1) modifying the catalyst to enhance its sensitivity towards the visible part of the spectrum [30][31][32][33], and (2) utilizing dispersing agents compatible with the studied material to achieve a proper distribution of the catalyst on the surface [34].…”

Section: Introductionmentioning

confidence: 99%

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Development of Photocatalytic Coatings for Building Materials with Bi2O3-ZnO Nanoparticles

Tena-Santafé,

Fernández,

Fernández-Acevedo

et al. 2023

Catalysts

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The aim of this study was to develop versatile coatings that can protect the stone surfaces of Architectural Heritage. Two different 3D media, namely superhydrophobic (SPHB) and hydro-oleophobic (OHB), were utilized as host matrices for nanostructured photocatalysts (Bi2O3-ZnO 8/92). These photocatalysts were sensitive to visible light to enhance their efficiency when exposed to sunlight. To prevent the nanophotocatalyst from clumping together in the 3D media, non-ionic dispersant additives (Tween20, TritonX-100, and Brij35) were incorporated. The optimized suspensions were then applied to various substrates such as sandstone, limestone, and granite. The effectiveness of the coatings was assessed by evaluating the hydrophobicity, oleophobicity, and photocatalytic activity of the coated substrates. The Bi2O3-ZnO photocatalyst exhibited higher activity in the SPHB medium compared to the OHB medium. To simulate real-life conditions, the coated substrates were subjected to accelerated weathering tests to predict their durability. Despite a significant reduction in their thickness, the coatings demonstrated sustained hydrophobic efficiency and self-cleaning capability after the accelerated ageing tests.

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Green building design application based on convolutional network and VR system

YuZhuo

Yao

2023

Int J Syst Assur Eng Manag

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Developing scenario of titania-based building materials for environmental remediation

Cited by 10 publications

References 112 publications

SiO2–TiO2 Nanoparticle Aqueous Foam for Volatile Organic Compounds’ Suppression

SiO2–TiO2 Nanoparticle Aqueous Foam for Volatile Organic Compounds’ Suppression

Development of Photocatalytic Coatings for Building Materials with Bi2O3-ZnO Nanoparticles

Green building design application based on convolutional network and VR system

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