The structure of colloidal polyethylenimine–silica nanocomposite microparticles

Semenova, Alexandra; Giles, Luke W.; Vidallon, Mark Louis P.; Follink, Bart; Brown, Paul L.; Tabor, Rico F.

doi:10.1016/j.partic.2022.07.015

Cited by 4 publications

(23 citation statements)

References 46 publications

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“…As discussed above, intermolecular electrostatic interactions in PEI are abundant and can prevent not only protonation of some amino groups, but can also block potential binding sites from interaction with copper. Silica nanoparticles, penetrating evenly throughout the PEI network 52 seem to screen neighboring PEI branches from each other, thus releasing more binding sites available for copper chelation. Results for equilibrium copper binding at various initial pH values allow a comprehensive comparison of the performance of the PEI microgel and PEI−silica composites with other materials designed for copper uptake.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…All chosen data of the maximal copper binding/adsorption capacity are presented in units of mg of retained copper per g of adsorbing material, and therefore, the corresponding values obtained in the present study (Table 1) were recalculated using the ratios of their PEI content known from earlier work. 52 The information presented in Table 2 indicates that materials based on PEI or chitosan have the highest binding capacities toward copper. However, chitosan-based materials are not stable under acidic conditions and decompose at pH < 4, 61 which restricts their applicability to mainly nonacidic wastewater treatment.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The silica-saturated composite was nearly half the rate, with the fast phase duration of around 20−30 min, which can be correlated with the highest silica content (around 45% by dry weight). 52 It is highly probable that the pores inside the silica-saturated composite are tightly packed with silica nanoparticles, which impedes the diffusion of copper to the complexation sites, increasing the effective time of copper binding. Also, the steady and slow increase of copper adsorption capacity after the second fast phase of the process can be explained by intraparticle diffusion.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The obtained silica "skeletons" were found to be free from organic polymer remnants, while keeping the structure of the original silica network in the standard composite particles. 52 The etched particles obtained were tested for their copper binding abilities in parallel with the PEI microgel and the original standard composite. Both kinetic and equilibrium experiments were carried out in 0.1 M KNO 3 and at pH 5 for easy comparison with the results previously obtained, but the binding capacity was calculated as mg/g of the tested material because the "skeleton" particles contain no PEI.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…It was determined that the PEI microgel and PEI−silica composites are stable during long-term storage in various aqueous solutions, without any depletion of copper-binding abilities after 120 days of storage. 52 Based on these findings, these materials are expected to perform through multiple copper extraction cycles with minimal loss of copper-binding capacity in a smartly designed and engineered process to ensure minimal loss of particulate matter during washing procedures.…”

Section: Xps Study Of Copper Binding Mechanismmentioning

confidence: 99%

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Copper-Binding Properties of Polyethylenimine–Silica Nanocomposite Particles

et al. 2022

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Increasing demand for copper resources, accompanied by increasing pollution, has resulted in an urgent need for effective materials for copper binding and extraction. Polyethylenimine (PEI) is one of the strongest copper-chelating agents but is not suitable directly (as is) for most applications due to its high solubility in water. PEI-based composite materials show potential as efficient and practical alternatives. In the present work, the interaction of copper ions with PEI−silica nanocomposite particles and precursor PEI microgels (as a reference) is investigated. It is hypothesized that the main driving force of the reaction is chelation of copper ions by amino groups in the PEI network. The presence of silica in the PEI−silica composites was shown to increase the copperbinding capacity in comparison with the parent microgel. The copper-binding behavior of etched (PEI-free "ghost") composite particles in comparison with the original composites and microgel particles shows that silica nanoparticles in the composite structure increase the number of copper-binding sites in the PEI network rather than adsorbing copper themselves. PEI−silica composites can be easily recycled after copper adsorption by simply washing in 1 M nitric acid, which results in complete copper extraction. Employing this recovery method, PEI−silica composite particles can be used for multiple, efficient cycles of copper removal and extraction.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Xps Study Of Copper Binding Mechanismmentioning

confidence: 99%

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Copper-Binding Properties of Polyethylenimine–Silica Nanocomposite Particles

et al. 2022

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Radially aligned hierarchical N-doped porous carbon beads derived from oil-sand asphaltene for long-life water filtration and wastewater treatment

Nasri‐Nasrabadi

Czech

Yadav

et al. 2023

Science of The Total Environment

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Polyethylenimine–Silica–Magnetic Nanoparticle Composites for Efficient Extraction of Dissolved Copper from Aqueous Solutions and Multiphase Mixtures

Semenova

Vidallon

Suzuki

et al. 2023

ACS Appl. Nano Mater.

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Design of micro/nanoadsorbents developed for effective copper extraction should consider methods of their retrieval from relevant copper-rich environments, which are commonly complex multiphase mixtures, such as slurries of polluted soils and sediments, copper minerals including lowgrade ores, and industrial and mining wastes. This work reports integration of copper-chelating polyethylenimine (PEI) with a robust silica network and highly magnetic magnetite nanoparticles, resulting in magnetic PEI−silica nanocomposite microparticles that enable efficient binding of copper ions in both aqueous solutions and complex, multiphase mixtures with subsequent retrieval using magnetic force. Produced via simple emulsion templating, these nanocomposite particles can withstand highly acidic conditions and multiple copper extraction cycles, without loss of efficiency after five consecutive cycles of copper extraction. PEI−silica−magnetic nanoparticles composites effectively bind all copper ions leached into an aqueous phase and allow their rapid magnetically induced separation from aqueous solutions and mixtures of both coarse and fine solid particles, demonstrating promising results for progress toward more sustainable copper extraction techniques.

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The structure of colloidal polyethylenimine–silica nanocomposite microparticles

Cited by 4 publications

References 46 publications

Copper-Binding Properties of Polyethylenimine–Silica Nanocomposite Particles

Copper-Binding Properties of Polyethylenimine–Silica Nanocomposite Particles

Radially aligned hierarchical N-doped porous carbon beads derived from oil-sand asphaltene for long-life water filtration and wastewater treatment

Polyethylenimine–Silica–Magnetic Nanoparticle Composites for Efficient Extraction of Dissolved Copper from Aqueous Solutions and Multiphase Mixtures

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