Filter function of graphene oxide: Trapping perfluorinated molecules

Barker, David; Fors, Angelica; Lindgren, Emelie; Olesund, Axel; Schröder, Elsebeth

doi:10.1063/1.5132751

Cited by 14 publications

(13 citation statements)

References 51 publications

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“…Barker et al reported binding energies between GO flakes and perfluorinated molecules calculated using density functional theory (DFT) and suggested Van der Waals interactions dominate adsorption. 41 Li et al used first-principles computations of iron on GO flakes to calculate binding strengths as well. 42 Surface complexation modelling has shown some metals adsorb by interacting with carboxyl groups located on the GO flakes.…”

Section: Introductionmentioning

confidence: 99%

Effects of Ion Adsorption on Graphene Oxide Films and Interfacial Water Structure: A Molecular-Scale Description

Carr

Kumal

et al. 2022

Preprint

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Graphene oxide is a promising, emerging separation material, as it is durable, dispersible in water, and has naturally forming functional groups. Bulk studies using graphene oxide flakes have demonstrated impressive metal adsorption. However, little interfacial information about water and metal organization near graphene oxide is available. A mechanistic understanding of water and ions interactions with graphene oxide films is critical toward advanced separations, including improved sorption efficiency and membrane regeneration. We study metal ion and local water organization near graphene oxide thin films formed at the air/water interface. These films are not typical membranes and allow us to determine nanoscale information about the graphene oxide-water interface. We accomplish this with x-ray reflectivity (XR), x-ray fluorescence near total reflection (XFNTR), and vibrational sum frequency generation spectroscopy (SFG). These interface-specific techniques provide the electron density profile normal to the interface, number of adsorbed ions, and information about the orientational ordering and hydrogen-bonding network of interfacial water, respectively. Via XFNTR and SFG, we find that trivalent yttrium ions preferentially adsorb to graphene oxide and affect its structure, compared to divalent strontium and monovalent cesium ions. Two different interfacial water populations can be described, based on their hydrogen bonding strength, and the adsorbed ions affect these populations differently. These results provide fundamental information about ion and water organization at the interface and help address the large computational-experimental agreement gap for graphene oxide systems. Additionally, they are relevant for improved soft-scaffold graphene oxide membranes and downstream applications.

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Section: Introductionmentioning

confidence: 99%

Effects of Ion Adsorption on Graphene Oxide Films and Interfacial Water Structure: A Molecular-Scale Description

Carr

Kumal

et al. 2022

Preprint

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“…[38][39] Bulk techniques, namely FTIR, Raman, UV-vis, and xray photoelectron spectroscopy (XPS), have identified varied adsorbed metal-GO binding, ranging from likely electrostatics 23,25 to specific binding with sulfur-and oxygen-based groups, 25,32,40 although the exact binding mechanisms remain unknown. Computational efforts have supported these findings, [41][42] mainly with surface complexation models. 29,[31][32] However, a large gap between computational and experimental agreement still exists.…”

Section: Introductionmentioning

confidence: 92%

Effects of Ion Adsorption on Graphene Oxide Films and Interfacial Water Structure: A Molecular-Scale Description

Carr

Kumal

et al. 2022

Preprint

View full text Add to dashboard Cite

Graphene oxide is a promising, emerging separation material, as it is durable, dispensable in water, and has naturally forming functional groups. Bulk studies using graphene oxide flakes have demonstrated impressive metal adsorption. However, little interfacial information about metal adsorption on graphene oxide is available and inferring interfacial structure from bulk experiments is usually not possible. A mechanistic understanding of ion adsorption on graphene oxide films is critical toward advanced separations, including improved sorption efficiency and membrane regeneration. In this paper, we study metal ion adsorption onto graphene oxide films formed at the air/water interface using x-ray reflectivity (XR), x-ray fluorescence near total reflection (XFNTR), and vibrational sum frequency generation spectroscopy (SFG). These interface-specific techniques provide the electron density profile normal to the interface, number of adsorbed ions, and information about the orientational ordering and hydrogen-bonding network of interfacial water, respectively. Via XFNTR and SFG, we find that trivalent yttrium ions preferentially adsorb to graphene oxide compared to divalent strontium and monovalent cesium ions. These trivalent ions affect the graphene oxide film structure significantly. The SFG data show that at least two different interfacial water populations can be described, based on their hydrogen bonding strength, and the adsorbed ions affect these populations differently. We demonstrate that ion adsorption onto graphene oxide is more complex than simple electrostatics and requires thorough interfacial investigation. These results pave the way toward improved soft-scaffold graphene oxide membranes and applications and provide fundamental information about the ion adsorption mechanism at the interface.

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“…The wavevector arguments reflect a Fourier transform in (r − r ) of, for example, r|χ λ (ω)|r . The Hubbard approximation for the HEG response, equations (51) and (52), makes it possible to provide an analytical evaluation of the coupling-constant integral. The result is a formal, Hubbard-based specification of the HEG XC energy [25]:…”

Section: Response In the Electron Gasmentioning

confidence: 99%

“…The vdW-DF versions and variants can, for example, be subjected to a formal couplingconstant analysis [14,15,[48][49][50][51] to isolate kinetic-energy, kinetic-correlation-energy, and electron-electron interaction binding contributions. This analysis provides a refined mapping [14,52] of where, for example, the vdW interactions between molecules and at surfaces originate in space [10,[53][54][55][56][57][58][59]. The coupling-constant scaling analysis can also be used to discuss the choice of Fock-exchange mixing in vdW-DF-based hybrids [13,15].…”

Section: Introductionmentioning

confidence: 99%

Friends or strangers? Attempts at reactivating buyer–supplier relationships

Poblete

Bengtson

2020

JBIM

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Purpose The purpose of this paper is to explore an important management aspect of business relationship dynamics, namely, the reactivation process of previously ended buyer–supplier relationships. Design/methodology/approach A processual case study approach focusing on a single in-depth case has been used. The case is based on longitudinal data from a number of sources concerning one reactivation failure. Findings Grounded in previous research and based on this study’s case findings, the authors have designed a model of analysis for relationship reactivation processes. Using the model on this study’s particular case, the authors show how the structural properties of network embeddedness and resource ties worked in favor of the process, whereas the social bonds and the lack of them led to mistrust that disturbed the negotiation and, hence, worked against the reactivation process. Originality/value This study makes a contribution to the field of relationship dynamics by exploring relationship reactivation processes. The designed model shows how reactivation can be understood as an interplay between structural properties and (re)building activities and contributes new knowledge on factors that affect this process.

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Filter function of graphene oxide: Trapping perfluorinated molecules

Cited by 14 publications

References 51 publications

Effects of Ion Adsorption on Graphene Oxide Films and Interfacial Water Structure: A Molecular-Scale Description

Effects of Ion Adsorption on Graphene Oxide Films and Interfacial Water Structure: A Molecular-Scale Description

Effects of Ion Adsorption on Graphene Oxide Films and Interfacial Water Structure: A Molecular-Scale Description

Friends or strangers? Attempts at reactivating buyer–supplier relationships

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