Coupled redox transformations of catechol and cerium at the surface of a cerium(III) phosphate mineral

Cervini-Silva, Javiera; Gilbert, Benjamin; Fakra, Sirine C.; Friedlich, Stephan; Banfield, Jillian F.

doi:10.1016/j.gca.2008.02.017

Cited by 10 publications

(8 citation statements)

References 60 publications

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“…36 The combined surface adsorption/oxidation process involves formation of Ce 3+ complexes as intermediates, which are characterized by a lower redox potential than Ce 3+ / Ce 4+ . 33,37 Both ascorbate and catechol can easily participate in oxidation processes with cerium ions with formation of radical intermediates. 33,38 When NPs are present, the intermediates (ascorbyl or semiquinone) can transfer the charge to an electron acceptor present onto the particle surface, either an oxygen vacancy in the lattice or the Ce 3+ , and form Ce 3+ complexes via charge transfer reactions.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Functional Paper-Based Platform for Rapid Capture and Detection of CeO₂ Nanoparticles

Othman

Andreescu

Karunaratne

et al. 2017

ACS Appl. Mater. Interfaces

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Development of systems for capture, sequestration, and tracking of nanoparticles (NPs) is becoming a significant focus in many aspects of nanotechnology and environmental research. These systems enable a broad range of applications for evaluating concentration, distribution, and effects of NPs for environmental, clinical, epidemiological, and occupational exposure studies. Herein, we describe the first example of a ligand-graft multifunctional platform for capture and detection of cerium oxide (CeO or ceria) NPs. The approach involves the use of redox-active ligands containing o-dihydroxy functionality, enabling multivalent binding, surface retention, and formation of charge transfer complexes between the grafted ligand and the NPs. Using this strategy, paper-based and microarray-printed platforms with NP-capture ability involving either catechol or ascorbic acid as ligands were successfully fabricated. Surface modification was determined by infrared spectroscopy, electron microscopy, X-ray spectroscopy, and thermogravimetric analysis. Functionality was demonstrated for the rapid assessment of NPs in chemical mechanical planarization (CMP) slurries and CMP wastewaters. This novel approach can enable further development of devices and separation technologies including platforms for retention and separation of NPs and measurement tools for detection of NPs in various environments.

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Section: ■ Materials and Methodsmentioning

confidence: 99%

Functional Paper-Based Platform for Rapid Capture and Detection of CeO₂ Nanoparticles

Othman

Andreescu

Karunaratne

et al. 2017

ACS Appl. Mater. Interfaces

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“…33 So far, STXM has been widely used to study polymers and chemical interactions between bacteria, extracellular organic molecules and nanoscale minerals in heterogeneous environmental systems. 34, 35 …”

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confidence: 99%

The Fate of ZnO Nanoparticles Administered to Human Bronchial Epithelial Cells

Fakra²,

et al. 2012

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A particular challenge for nanotoxicology is the evaluation of the biological fate and toxicity of nanomaterials that dissolve in aqueous fluids. Zinc oxide nanomaterials are of particular concern because dissolution leads to release of the toxic divalent zinc ion. Although dissolved zinc ions have been implicated in ZnO cytotoxicity, direct identification of the chemical form of zinc taken up by cells exposed to ZnO nanoparticles, and its intracellular fate, has not yet been achieved. We combined high resolution X-ray spectromicroscopy and high elemental sensitivity X-ray microprobe analyses to determine the fate of ZnO and less soluble iron-doped ZnO nanoparticles following exposure to cultures of human bronchial epithelial cells, BEAS-2B. We complemented two-dimensional X-ray imaging methods with atomic force microscopy of cell surfaces to distinguish between nanoparticles that were transported inside the cells from those that adhered to the cell exterior. The data suggest cellular uptake of ZnO nanoparticles is a mechanism of zinc accumulation in cells. Following uptake, ZnO nanoparticles dissolved completely generating intracellular Zn2+ complexed by molecular ligands. These results corroborate a model for ZnO nanoparticle toxicity that is based on nanoparticle uptake followed by intracellular dissolution.

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“…Sparta saprolite sequences are presently covered with an organic-rich soil horizon that could supply organic acids resulting from the oxidation of organic matter . Organic acids have been shown to increase the solubility and aqueous stability of REEs. ,,,,,, The existence of an upper organic-rich horizon would have provided an abundance of organic acids that could leach into the underlying saprolite, facilitating the dissolution of phosphate minerals and LREEs from the upper section of the saprolite.…”

Section: Discussionmentioning

confidence: 99%

“…39 Organic acids have been shown to increase the solubility and aqueous stability of REEs. 3,7,9,22,23,40,41 The existence of an upper organic-rich horizon would have provided an abundance of organic acids that could leach into the underlying saprolite, facilitating the dissolution of phosphate minerals and LREEs from the upper section of the saprolite. Sedimentary Kaolin REE Characteristics: Primary or Secondary Signature?…”

Section: ■ Analytical Methodsmentioning

confidence: 99%

Geochemical Evidence for Rare-Earth Element Mobilization during Kaolin Diagenesis

Cheshire

Bish

Cahill

et al. 2018

ACS Earth Space Chem.

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This study investigates how saprolization influences inherent rare-earth element (REE) source rock signatures and how depositional environment(s) and diagenetic reactions ultimately impact the REE signature within sedimentary kaolin bodies. Rare-earth element geochemistry signatures are particularly useful for tracking element sources and mobility and are, therefore, powerful tools in the investigation of clay mineral formation and diagenesis. Rareearth element and bulk chemical compositions were determined using discrete chemical analyses and chemical imaging. Saprolitic materials show an enrichment in the light and heavy REEs, compared with the parent material, with enhanced Ce/Eu anomalies. Light REEs within sedimentary kaolins are associated with phosphate mineralogy and have experienced variable degrees of diagenetic fractionation and mobilization. Cretaceous kaolins display more light REE mobility compared with Tertiary kaolins, which show very little REE fractionation. Degrees of REE fractionation are driven primarily by differences in sedimentary kaolin physical properties and the presence of organic acids in groundwater. Unfortunately, the provenance of the Georgia kaolins could not be determined based solely on the trace-element and REE compositions because fractionations during saprolization and diagenesis mask much of the inherent provenance signatures. Finally, implications for the REEs as an economic deposit and their beneficiation are discussed.

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Coupled redox transformations of catechol and cerium at the surface of a cerium(III) phosphate mineral

Cited by 10 publications

References 60 publications

Functional Paper-Based Platform for Rapid Capture and Detection of CeO₂ Nanoparticles

Functional Paper-Based Platform for Rapid Capture and Detection of CeO₂ Nanoparticles

The Fate of ZnO Nanoparticles Administered to Human Bronchial Epithelial Cells

Geochemical Evidence for Rare-Earth Element Mobilization during Kaolin Diagenesis

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Coupled redox transformations of catechol and cerium at the surface of a cerium(III) phosphate mineral

Cited by 10 publications

References 60 publications

Functional Paper-Based Platform for Rapid Capture and Detection of CeO2 Nanoparticles

Functional Paper-Based Platform for Rapid Capture and Detection of CeO2 Nanoparticles

The Fate of ZnO Nanoparticles Administered to Human Bronchial Epithelial Cells

Geochemical Evidence for Rare-Earth Element Mobilization during Kaolin Diagenesis

Contact Info

Product

Resources

About

Functional Paper-Based Platform for Rapid Capture and Detection of CeO₂ Nanoparticles

Functional Paper-Based Platform for Rapid Capture and Detection of CeO₂ Nanoparticles