Macrosurfactant-mediated, aminopolycarboxy-acid-decorated open-cellular adsorbent for removing metal micropollutants from water

Weng, Shiqi; Jin, Ming; Wan, Decheng

doi:10.1039/c9qm00736a

Cited by 4 publications

(11 citation statements)

References 48 publications

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“…After dictation on the polyHIPE surface, the active amino groups of PEI macrosurfactants represent a useful engineering platform. Weng et al [57] very recently developed a physically aided and one-pot HIPE process for APA-dictated polyHIPE (Figure 7). The self-assembly of PEI macrosurfactant stabilized the HIPE and rendered the active amino groups arrayed along the oil/water interface, thereby leading to their transformation into APAs.…”

Section: Pei Macrosurfactant-aided Aminopolycarboxylicacid-dictated Pmentioning

confidence: 99%

Dendritic Macrosurfactant Assembly for Physical Functionalization of HIPE-Templated Polymers

Weng

Jin

et al. 2020

Polymers

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High-internal-phase emulsion-templated macroporous polymers (polyHIPEs) have attracted much interest, but their surface functionalization remains a primary concern. Thus, competitive surface functionalization via physical self-assembly of macrosurfactants was reviewed. Dendritic and diblock-copolymer macrosurfactants were tested, and the former appeared to be more topologically competitive in terms of solubility, viscosity, and versatility. In particular, hyperbranched polyethyleneimine (PEI) was transformed into dendritic PEI macrosurfactants through click-like N-alkylation with epoxy compounds. Free-standing PEI macrosurfactants were used as molecular nanocapsules for charge-selective guest encapsulation and robustly dictated the surface of a macroporous polymer through the HIPE technique, in which the macroporous polymer could act as a well-recoverable adsorbent. Metal nanoparticle-loaded PEI macrosurfactants could similarly lead to polyHIPE, whose surface was dictated by its catalytic component. Unlike conventional Pickering stabilizer, PEI macrosurfactant-based metal nanocomposite resulted in open-cellular polyHIPE, rendering the catalytic sites well accessible. The active amino groups on the polyHIPE could also be transformed into functional groups of aminopolycarboxylic acids, which could efficiently eliminate trace and heavy metal species in water.

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Section: Pei Macrosurfactant-aided Aminopolycarboxylicacid-dictated Pmentioning

confidence: 99%

Dendritic Macrosurfactant Assembly for Physical Functionalization of HIPE-Templated Polymers

Weng

Jin

et al. 2020

Polymers

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“…CM-PEI incorporated into mesoporous carbon successfully immobilized Eu 3+ ions, a commonly used surrogate for radioactive Am 3+ ions . Weng et al synthesized a polymerized PEI macrosurfactant-based cellular material they functionalized with chloroacetic acid, yielding a solid foamlike CM-PEI derivative with a large surface area and high affinity toward heavy metals …”

Section: Introductionmentioning

confidence: 99%

“…22 Weng et al synthesized a polymerized PEI macrosurfactantbased cellular material they functionalized with chloroacetic acid, yielding a solid foamlike CM-PEI derivative with a large surface area and high affinity toward heavy metals. 23 In the field of analytical chemistry, Macka et al found that CM-PEI can be used as a new isoelectric buffer for capillary electrophoresis. 24 These authors tried to use both acid−base and conductometric titration to determine the isoelectric point of their CM-PEI sample but got only "diffuse" titration curves and finally resorted to estimate the isoelectric point from the pH of their dialyzed CM-PEI solution, which was around 6.8.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The reaction mixture was thermostated to 25 °C and followed for at least 20 h at λ = 265 nm, corresponding to the local absorption maximum of ascorbic acid. 32,33 Sodium Binding 23 Na NMR TQF Experiment. Solutions containing 40 mg/mL CM-PEI_4 and 50 mM NaOH were prepared and adjusted to pH values of 11.67, 10.65, 9.63, and 8.61, respectively, with concentrated HCl.…”

Section: ■ Introductionmentioning

confidence: 99%

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Synthesis and Characterization of Carboxymethylated Polyethylenimines

Novák,

Miklósi,

Nyul

et al. 2023

ACS Appl. Polym. Mater.

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As potential paramagnetic metal ion complexing macromolecular ligands, carboxymethylated polyethylenimines (CM-PEIs) were successfully prepared from polyethylenimine (PEI) with 2-chloroacetic acid (CA) in an alkaline medium. SEC, pH-potentiometry, DLS, and multinuclear and multidimensional NMR techniques were used to determine the degree of functionalization, size, and possible structure of the modified polymers. By varying the amount of CA, functionalization degrees of 7–67% relative to the theoretical maximum were achieved. Diffusometry shows that the PEI and CM-PEIs are highly hydrated. The CM-PEIs are larger molecules than the parent PEI, although their hydrodynamic size decreases with higher degrees of functionalization. CM-PEIs are isostable except for the most highly substituted derivative. CM-PEIs form complexes with Cu(II) and efficiently decrease the rate of the copper-mediated oxidation of ascorbic acid. The good affinity toward cations of CM-PEI functionalized at 67% is further demonstrated by its capacity to bind even sodium ions. These properties show that CM-PEIs are promising metal-chelating polymers for diagnostic or theranostic purposes.

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“…The interest in macroporous emulsion‐templated polymer systems for a variety of adsorption applications has increased significantly in recent years. These applications, inspired by the versatility that emulsion templating has to offer, both in the nature of the polymer walls and in the functionality of the polymer surface, include systems for the adsorption of cationic organics, 34,48–55 herbicides, 56 viruses, 57 metal ions, 58–66 phenolics, 67 and proteins 68 …”

Section: Introductionmentioning

confidence: 99%

β‐Cyclodextrin‐based macroporous monoliths: One‐pot oil‐in‐oil emulsion templating and adsorption

Berezovska

Sanguramath

Silverstein

2021

Journal of Polymer Science

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The ability of β‐cyclodextrin (β‐CD) to form a host–guest complex with relatively hydrophobic molecules such as bisphenol A (BPA), a common wastewater contaminant, has inspired the development of β‐CD‐containing polymers for adsorption applications. For the most part, these polymers are powders, which can limit their applicability. Here, low‐density (~0.1 g cm−3), macroporous monoliths based on unmodified β‐CD were synthesized using emulsion templating. The relatively simple, one‐pot, polyurethane synthesis took place within the external phase of oil‐in‐oil (o/o) high internal phase emulsions (HIPEs) that contained β‐CD and a diisocyanate. The combination of o/o emulsions and a polyurethane reaction enabled the incorporation of relatively high β‐CD contents (up to 63 wt%) and limited the occurrence of the water–isocyanate urea reaction. The resulting open‐cell porous structures varied from an average pore size of 5.0 μm (lower surfactant content) to the typical structure associated with polyHIPEs (higher surfactant content), voids of ~50 μm and interconnecting holes ranging from submicrometer to ~2 μm. The compressive mechanical behaviors of the easily handled monoliths were similar to those of flexible foams, reaching strains of 70% without failure. The BPA adsorption capacities, up to 117.7 mg g−1, may make these monoliths advantageous for adsorption applications.

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Macrosurfactant-mediated, aminopolycarboxy-acid-decorated open-cellular adsorbent for removing metal micropollutants from water

Abstract: An open-cellular macroporous monolith with its pore surfaces decorated with aminopolycarboxy acids can be prepared in one pot and used to eliminate trace heavy metal ions in water.

Cited by 4 publications

References 48 publications

Dendritic Macrosurfactant Assembly for Physical Functionalization of HIPE-Templated Polymers

Dendritic Macrosurfactant Assembly for Physical Functionalization of HIPE-Templated Polymers

Synthesis and Characterization of Carboxymethylated Polyethylenimines

β‐Cyclodextrin‐based macroporous monoliths: One‐pot oil‐in‐oil emulsion templating and adsorption

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