Effect of surface, structural and textural properties of graphenic materials over cooperative and synergetic adsorptions of two chloroaromatic compounds from aqueous solution

Esteban-Arranz, Adrián; Compte-Tordesillas, D.; Muñoz-Andrés, V.; Pérez‐Cadenas, María; Guerrero-Ruı́z, A.

doi:10.1016/j.cattod.2017.03.048

“…Although similar lateral dimensions between mlGO and lGO are found, the lowest TSI value is acquired with this mlGO material, suggesting that the thickness of the 2D graphene oxide is a more crucial physical parameter than its lateral dimension for colloidal stability applications in aqueous solution. to π->π* transitions of aromatic C=C bonds, and a shoulder at GrO (298.9 nm), lGO (296.6 nm), sGO (294.2 nm) to mlGO (295.7 nm), which can be attributed to n-> π* transitions of C=O bonds, similar to that reported by Paredes et al [28].…”

Section: Surface Propertiessupporting

confidence: 89%

Thickness of graphene oxide-based materials as a control parameter

Esteban-Arranz

¹

,

Arranz

²

,

Morales

³

et al. 2021

Preprint

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Graphene oxide-based materials have been widely used for different applications, such as: biotechnology, electronics, and adsorption or separation technologies amongst other uses. In this study, graphite oxide (GrO), large graphene oxide (lGO) and small graphene oxide (sGO) were synthesized. Monolayer large graphene oxide (mlGO) was detected and isolated in this synthesis prior to lGO separation from GrO. A battery of techniques was applied to elucidate their physicochemical properties. Morphological results acquired by high resolution scanning electron microscopy, transmission electron microscopy and scanning transmission electron microscopy demonstrated the flat and planar structures of these materials. Similar lateral dimensions were found for lGO and mlGO unlike sGO. However, based on atomic force microscopy studies, it was able to demonstrate that lGO presented thicker laminar structures than mlGO. Their crystallography evaluated by x-ray diffraction corroborated the results obtained by the atomic force microscopy studies, since mlGO displayed a diffractogram characteristic of highly exfoliated material. Additionally, Turbiscan experiments revealed a more significant impact from the thickness of these materials in contrast to their lateral dimensions in their colloidal stability properties in aqueous solution. Characterization results were correlated with the optical band gap obtained from the Tauc method of their UV-vis absorption spectra, which could be implemented to characterize in-line the production of these carbon materials to optoelectronic devices.

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“…This latter band can also be linked with the aromaticity, which is mainly connected to the existence of vicinal hydroxyl groups in acidic surfaces. Similar results were obtained elsewhere [28]. However, even though all materials present the same oxygenated functionalities, some differences have been found.…”

Section: Surface Propertiessupporting

confidence: 88%

Thickness of graphene oxide-based materials as a control parameter

Esteban-Arranz

¹

,

Arranz

²

,

Morales

³

et al. 2021

Preprint

View full text Add to dashboard Cite

Graphene oxide-based materials have been widely used for different applications, such as: biotechnology, electronics, and adsorption or separation technologies amongst other uses. In this study, graphite oxide (GrO), large graphene oxide (lGO) and small graphene oxide (sGO) were synthesized. Monolayer large graphene oxide (mlGO) was detected and isolated in this synthesis prior to lGO separation from GrO. A battery of techniques was applied to elucidate their physicochemical properties. Morphological results acquired by high resolution scanning electron microscopy, transmission electron microscopy and scanning transmission electron microscopy demonstrated the flat and planar structures of these materials. Similar lateral dimensions were found for lGO and mlGO unlike sGO. However, based on atomic force microscopy studies, it was able to demonstrate that lGO presented thicker laminar structures than mlGO. Their crystallography evaluated by x-ray diffraction corroborated the results obtained by the atomic force microscopy studies, since mlGO displayed a diffractogram characteristic of highly exfoliated material. Additionally, Turbiscan experiments revealed a more significant impact from the thickness of these materials in contrast to their lateral dimensions in their colloidal stability properties in aqueous solution. Characterization results were correlated with the optical band gap obtained from the Tauc method of their UV-vis absorption spectra, which could be implemented to characterize in-line the production of these carbon materials to optoelectronic devices.

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“…Their spectra are shown in Figure S3 . AC showed less prominent vibration modes in comparison to the other nanoparticles due to its black appearance [ 32 ]. In the case of the SMNC spectrum, the bands near 2963, 2922 and 2854 cm −1 were assigned to the stretching vibration of aliphatic groups (C-H) in organic matter [ 33 ].…”

Section: Resultsmentioning

confidence: 99%

“…Their spectra are shown in Figure S3. AC showed less prominent vibration modes in comparison to the other nanoparticles due to its black appearance [32]. In the case of the SMNC…”

Section: Characterization Of Commercial Nanoparticlesmentioning

confidence: 92%

Long-Term Performance of Nanomodified Coated Concrete Structures under Hostile Marine Climate Conditions

Esteban-Arranz

¹

,

Osa

²

,

García-Lorefice

³

et al. 2021

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Epoxy resin coatings are commonly used to protect concrete structures due to their excellent chemical corrosion resistance and strong adhesion capacity. However, these coatings are susceptible to damage by surface abrasion and long-term contact with marine climate conditions, deteriorating their appearance and performance. This study aims to optimize the performance of cement-based epoxy resin coatings, bisphenol-A and polyol, in aggressive environments by functionalizing the selected systems with different nanoparticles such as activated carbon, surface modified nanoclay, silica and zinc oxide. Nanomodified coatings were applied to concrete specimens and subjected to three weeks in a spray salt chamber and three weeks in a QUV chamber. They were found to present improved thermal resistance and curing degree after the weathering test. Their water permeability, adhesion, and abrasion resistance properties were evaluated before and after this test. The results showed that the nature of the nanocomposites determined their water permeability; the bare resin presented the worst result. Additionally, nanomodified composites with activated carbon and silica showed the best adherence and abrasion resistance properties, due to the effect of this aging test on their thermal stability and curing degree.

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Effect of surface, structural and textural properties of graphenic materials over cooperative and synergetic adsorptions of two chloroaromatic compounds from aqueous solution

Cited by 24 publications

References 43 publications

Thickness of graphene oxide-based materials as a control parameter

Thickness of graphene oxide-based materials as a control parameter

Thickness of graphene oxide-based materials as a control parameter

Long-Term Performance of Nanomodified Coated Concrete Structures under Hostile Marine Climate Conditions

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