Characterization of TiO2 nanoparticle suspensions in aqueous solutions and TiO2 nanoparticle retention in water-saturated columns packed with glass beads

Sygouni, Varvara; Chrysikopoulos, Constantinos V.

doi:10.1016/j.cej.2014.10.044

Cited by 45 publications

(21 citation statements)

References 52 publications

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“…Clearly, that the sorbed FA concentration was very similar in all three pH cases (4, 7.5 and 10) considered in this study. A possible explanation for this is that all the pH values used in this study were higher than the isoelectric point pH IEP = 3.5 for the mixture of rutile and anatase [31], which is close to other values reported in the literature [70]. Note that pH IEP values for TiO 2 nanoparticles may vary significantly depending on the manufacturer [71].…”

Section: Resultssupporting

confidence: 84%

“…Nanotechnology research has increased in the recent years and many revolutionary developments have taken place in this field. Nanomaterials have been extensively studied due to their many applications in the fields of energy, electronics, biomedicine and environmental remediation [28][29][30][31][32][33][34]. Titanium dioxide (TiO 2 ) is a nanomaterial, which has been used extensively in various commercial applications and catalytic reactions due to its very good physical, optical, electrical, and stable structural properties [35,36].…”

Section: Introductionmentioning

confidence: 99%

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Interaction of Titanium Dioxide with Formaldehyde in the Presence of Quartz Sand under Static and Dynamic Conditions

Stefanarou

Chrysikopoulos

2021

Water

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Formaldehyde (FA) is an extremely active compound that is widely used in numerous applications. Given that FA is a known carcinogen, it is essential to remove it from the environment. Titanium dioxide (TiO2), due to its special physicochemical properties, is a promising adsorbent for the removal of specific organic compounds from aqueous solutions. In this study, the interaction of TiO2 with FA in the presence and absence of quartz sand, the most common mineral on the Earth’s surface, was investigated under static and dynamic (batch) conditions, at 25 °C. The experimental data suggested that the sorption of FA onto TiO2 can be described adequately by a pseudo-second order kinetic model, indicating that the main sorption mechanism was chemisorption. It was observed that the combination of TiO2 and quartz sand could1 lead up to effective removal of FA from aqueous samples.

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Section: Resultssupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Interaction of Titanium Dioxide with Formaldehyde in the Presence of Quartz Sand under Static and Dynamic Conditions

Stefanarou

Chrysikopoulos

2021

Water

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“…The TiO 2 NPs properties (e.g. high surface area, small size, surface chemistry, electrical properties) may be altered when dispersed in natural environments and their transport in porous media may be affected by environmental conditions (Fang et al, 2009;Chen et al, 2011;Chowdhury et al, 2011;Godinez and Darnault, 2011;Sygouni and Chrysikopoulos, 2015). Moreover, TiO 2 NPs have shown a strong tendency to attach onto biocolloids (e.g.…”

Section: Introductionmentioning

confidence: 98%

Cotransport of human adenoviruses with clay colloids and TiO2 nanoparticles in saturated porous media: Effect of flow velocity

Syngouna

Chrysikopoulos

Kokkinos

et al. 2017

Science of The Total Environment

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“…Therefore, concerns have risen about their probable effects on several useful bacteria (e.g., used in activated sludge) that are part of our eco-system. No wonder, therefore, the many recent studies on the mechanisms controlling the transport of nanoparticles and their fate, Klaine et al 2008, Phenrat et al 2010, Abraham et al 2013, Goldberg et al 2014, Sygouni et al 2014, Sygouni and Chrysikopoulos 2015, and many others.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Numerical investigation of nanoparticles transport in anisotropic porous media

Salama

Negara

El-Amin

et al. 2015

Journal of Contaminant Hydrology

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In this work the problem related to the transport of nanoparticles in anisotropic porous media is investigated numerically using the multipoint flux approximation. Anisotropy of porous media properties are an essential feature that exist almost everywhere in subsurface formations. In anisotropic media, the flux and the pressure gradient vectors are no longer collinear and therefore interesting patterns emerge. The transport of nanoparticles in subsurface formations is affected by several complex processes including surface charges, heterogeneity of nanoparticles and soil grain collectors, interfacial dynamics of double-layer and many others. We use the framework of the theory of filtration in this investigation. Processes like particles deposition, entrapment, as well as detachment are accounted for. From the numerical methods point of view, traditional twopoint flux finite difference approximation cannot handle anisotropy of media properties. Therefore, in this work we use the multipoint flux approximation (MPFA). In this technique, the flux components are affected by more neighboring points as opposed to the mere two points that are usually used in traditional finite volume methods. We also use the experimenting pressure field approach which automatically constructs the global system of equations by solving multitude of local problems. This approach facilitates to a large extent the construction of the global system. A set of numerical examples is considered involving two-dimensional rectangular domain. A source of nanoparticles is inserted in the middle of the anisotropic layer. We investigate the effects of both anisotropy angle and anisotropy ratio on the transport of nanoparticles in saturated porous media. It is found that the concentration plume and porosity contours follow closely the principal direction of anisotropy of permeability of the central domain.

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Characterization of TiO2 nanoparticle suspensions in aqueous solutions and TiO2 nanoparticle retention in water-saturated columns packed with glass beads

Cited by 45 publications

References 52 publications

Interaction of Titanium Dioxide with Formaldehyde in the Presence of Quartz Sand under Static and Dynamic Conditions

Interaction of Titanium Dioxide with Formaldehyde in the Presence of Quartz Sand under Static and Dynamic Conditions

Cotransport of human adenoviruses with clay colloids and TiO2 nanoparticles in saturated porous media: Effect of flow velocity

Numerical investigation of nanoparticles transport in anisotropic porous media

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