Fe<sub>3</sub>O<sub>4</sub>nanoparticles coated with a guanidinium-functionalized polyelectrolyte extend the pH range for phosphate binding

Paltrinieri, Laura; Wang, Min; Sachdeva, Sumit; Besseling, N.A.M.; Sudhölter, Ernst J. R.; Smet, Louis C. P. M. de

doi:10.1039/c7ta04054g

Cited by 43 publications

(33 citation statements)

References 67 publications

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“…The amounts of found carbon at the membrane surface are comparable for both membranes; the small difference can be associated with some hydrocarbon contamination. 27,48…”

Section: Resultsmentioning

confidence: 99%

Functionalized Anion-Exchange Membranes Facilitate Electrodialysis of Citrate and Phosphate from Model Dairy Wastewater

Paltrinieri

Huerta

Puts

et al. 2018

Environ. Sci. Technol.

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In this study, the preparation of a new, functional anion-exchange membrane (AEM), containing guanidinium groups as the anion-exchanging sites (Gu-100), is described as well as the membrane characterization by XPS, water uptake, permselectivities, and electrical resistances. The functional membrane was also employed in pH-dependent electrodialysis experiments using model dairy wastewater streams. The properties of the new membrane are compared to those of a commercially available anion-exchange membrane bearing conventional quaternary ammonium groups (Gu-0). Guanidinium was chosen for its specific binding properties toward oxyanions: e.g., phosphate. This functional moiety was covalently coupled to an acrylate monomer via a facile two-step synthesis to yield bulk-modified membranes upon polymerization. Significant differences were observed in the electrodialysis experiments for Gu-0 and Gu-100 at pH 7, showing an enhanced phosphate and citrate transport for Gu-100 in comparison to Gu-0. At pH 10 the difference is much more pronounced: for Gu-0 membranes almost no phosphate and citrate transport could be detected, while the Gu-100 membranes transported both ions significantly. We conclude that having guanidinium groups as anion-exchange sites improves the selectivity of AEMs. As the presented monomer synthesis strategy is modular, we consider the implementation of functional groups into a polymer-based membrane via the synthesis of tailor-made monomers as an important step toward selective ion transport, which is relevant for various fields, including water treatment processes and fuel cells.

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“…The amounts of found carbon at the membrane surface are comparable for both membranes; the small difference can be associated with some hydrocarbon contamination. 27,48…”

Section: Resultsmentioning

confidence: 99%

Functionalized Anion-Exchange Membranes Facilitate Electrodialysis of Citrate and Phosphate from Model Dairy Wastewater

Paltrinieri

Huerta

Puts

et al. 2018

Environ. Sci. Technol.

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“…Polyelectrolytes are the basis for a broad class of functional systems including self-assembled copolymer membranes, polymer-coated nanoparticles, polyelectrolyte microgels, and hydrogel networks [1,2,3,4,5,6,7,8,9,10,11]. Though regarded as innately charged, polyelectrolytes frequently contain weakly acidic or basic moieties distributed along the polymer backbone.…”

Section: Introductionmentioning

confidence: 99%

Explicit Ion Effects on the Charge and Conformation of Weak Polyelectrolytes

et al. 2019

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The titration behavior of weak polyelectrolytes is of high importance, due to their uses in new technologies including nanofiltration and drug delivery applications. A comprehensive picture of polyelectrolyte titration under relevant conditions is currently lacking, due to the complexity of systems involved in the process. One must contend with the inherent structural and solvation properties of the polymer, the presence of counterions, and local chemical equilibria enforced by background salt concentration and solution acidity. Moreover, for these cases, the systems of interest have locally high concentrations of monomers, induced by polymer connectivity or confinement, and thus deviate from ideal titration behavior. This work furthers knowledge in this limit utilizing hybrid Monte Carlo–Molecular Dynamics simulations to investigate the influence of salt concentration, pK a , pH, and counterion valence in determining the coil-to-globule transition of poorly solvated weak polyelectrolytes. We characterize this transition at a range of experimentally relevant salt concentrations and explicitly examine the role multivalent salts play in determining polyelectrolyte ionization behavior and conformations. These simulations serve as an essential starting point in understanding the complexation between weak polyelectrolytes and ion rejection of self-assembled copolymer membranes.

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“…The stretching vibration of the hydroxyl (OH) groups appears at 3434 cm −1 . In the FT‐IR spectrum of Fe 3 O 4 @silica‐MCM‐41 (Figure c), reduction of peaks at 457 and 1084 cm −1 corresponding to Si‐O and Si‐O‐Si, associated with covalent bonds, was observed for Fe‐O‐Si as a result of OH condensation and the absorption peak at 571 cm −1 is owing to stretching vibrations of Fe‐O . For Fe 3 O 4 @MCM‐41@DABCO (Figure d), two typical peaks appear in the spectrum.…”

Section: Resultsmentioning

confidence: 98%

Fe₃O₄@silica‐MCM‐41@DABCO: A novel magnetically reusable nanostructured catalyst for clean in situ synthesis of substituted 2‐aminodihydropyrano[3,2‐b]pyran‐3‐cyano

Aghbash

Pesyan

Batmani

2019

Applied Organom Chemis

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DABCO (1,4-diazabicyclo[2.2.2]octane)-modified magnetite with silica-MCM-41 shell (Fe 3 O 4 @silica-MCM-41@DABCO) as an effective, magnetic and novel heterogeneous reusable nanocatalyst was synthesized and analysed using various techniques. Evaluation of the catalytic activity of this nanocatalyst was performed in the clean synthesis of substituted 2-aminodihydropyrano[3,2-b] pyran-3-cyano in high yields via in situ reaction of azido kojic acid, malononitrile and various aldehydes.KEYWORDS 2-amino-4,8-dihydropyrano[3,2-b]pyran-3-carbonitrile, azido kojic acid, Fe 3 O 4 @MCM-41@DABCO, Michael addition, nanocatalyst

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Fe₃O₄nanoparticles coated with a guanidinium-functionalized polyelectrolyte extend the pH range for phosphate binding

Abstract: This work shows the enhanced effect of functional coatings on phosphate adsorption at alkaline conditions using Fe3O4NPs.

Cited by 43 publications

References 67 publications

Functionalized Anion-Exchange Membranes Facilitate Electrodialysis of Citrate and Phosphate from Model Dairy Wastewater

Functionalized Anion-Exchange Membranes Facilitate Electrodialysis of Citrate and Phosphate from Model Dairy Wastewater

Explicit Ion Effects on the Charge and Conformation of Weak Polyelectrolytes

Fe₃O₄@silica‐MCM‐41@DABCO: A novel magnetically reusable nanostructured catalyst for clean in situ synthesis of substituted 2‐aminodihydropyrano[3,2‐b]pyran‐3‐cyano

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Fe3O4nanoparticles coated with a guanidinium-functionalized polyelectrolyte extend the pH range for phosphate binding

Abstract: This work shows the enhanced effect of functional coatings on phosphate adsorption at alkaline conditions using Fe3O4NPs.

Cited by 43 publications

References 67 publications

Functionalized Anion-Exchange Membranes Facilitate Electrodialysis of Citrate and Phosphate from Model Dairy Wastewater

Functionalized Anion-Exchange Membranes Facilitate Electrodialysis of Citrate and Phosphate from Model Dairy Wastewater

Explicit Ion Effects on the Charge and Conformation of Weak Polyelectrolytes

Fe3O4@silica‐MCM‐41@DABCO: A novel magnetically reusable nanostructured catalyst for clean in situ synthesis of substituted 2‐aminodihydropyrano[3,2‐b]pyran‐3‐cyano

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Fe₃O₄nanoparticles coated with a guanidinium-functionalized polyelectrolyte extend the pH range for phosphate binding

Fe₃O₄@silica‐MCM‐41@DABCO: A novel magnetically reusable nanostructured catalyst for clean in situ synthesis of substituted 2‐aminodihydropyrano[3,2‐b]pyran‐3‐cyano