Glutaraldehyde and Glyoxal Crosslinked Polyethylenimine for Copper Ion Adsorption from Water

Swamy, Azekah Yashna; Prasad, Shelvin; Pan, Xun; Andersson, Mats R.; Gedefaw, Desta Antenehe

doi:10.1002/slct.202104318

Cited by 3 publications

(1 citation statement)

References 32 publications

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“…Cu(II) is non-degradable and bio-accumulative. The health risks of Cu(II) pollution include damage to organs such as the kidneys, liver, brain, and digestive system as well as neurological dysfunction [5][6][7]. As a result, various approaches have been taken to alleviate Cu(II) pollution.…”

Section: Introductionmentioning

confidence: 99%

Removal of Cu(II) from aqueous solutions by zinc oxide‐montmorillonite composite

Wang

Peng

et al. 2023

J Chinese Chemical Soc

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BackgroundCu(II) is considered to be a heavy metal ion that is quite hazardous to water.AimsZinc oxide‐montmorillonite composite (ZnO‐Mt) for the removal of Cu(II) from aqueous solutions.Materials & MethodsZnO‐Mt was prepared through ion exchange followed by heat treatment to form a highly effective adsorbent.ResultsThe structure and morphology of the composite were investigated by X‐ray diffraction, scanning electron microscope, and fourier transform infrared spectroscopy and it was found that Zinc oxide was successfully coated on montmorillonite. The composite has a superior removal effect on Cu(II) in an aqueous solution with an adsorption capacity of 192.89 mg·g−1. The adsorption kinetic model and the adsorption isotherm model are described by the pseudo‐second‐order kinetic equation and the Langmuir equation, respectively. The activation energy (Ea) was 84.18 kJ·mol−1, indicating that the adsorption was dominated by chemisorption. In addition, ZnO‐Mt can be applied in a wide pH range (3 ~ 8) and exhibits satisfactory selectivity for the adsorption of Cu(II) in the presence of coexisting cations. The removal efficiency of ZnO‐Mt for Cu(II) remains at 72% of the fresh adsorbent after five cycles.DiscussionA combination of experiment, characterization, and density functional theory analysis showed that the mechanism of Cu(II) removal was mainly surface complexation, ion exchange, and electrostatic attraction.ConclusionTherefore, the ZnO‐Mt composite is a promising and efficient adsorbent for the removal of Cu(II) from aqueous solutions.

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Section: Introductionmentioning

confidence: 99%

Removal of Cu(II) from aqueous solutions by zinc oxide‐montmorillonite composite

Wang

Peng

et al. 2023

J Chinese Chemical Soc

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Identifying Performance Conditions for a Radical Scavenging Active Packaging Material

Kay,

Goddard

2024

Packag Technol Sci

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Global food waste remains a significant economic and environmental burden throughout the food supply chain. Oxidative degradation and microbial growth are two of the most prominent causes of post‐manufacturing food spoilage and are thus often targets of active packaging technologies that seek to maintain or improve shelf life by adding preservative functionality to the packaging material. In non‐migratory active packaging, the active agent is bound to the polymer backbone preventing its migration to the foodstuff in support of consumer demands for cleaner labels. Critical to commercial translation of such non‐migratory active packaging technologies is identifying circumstances conducive to their optimal performance as well as those for which performance falls short of predicted behaviour. Here, we present an applications study to identify conditions of optimal performance of a non‐migratory radical scavenging active packaging material, polypropylene‐graft‐polyethyleneimine (PP‐g‐PEI5), synthesized by reactive extrusion of polyethylenimine with maleic anhydride functionalized polypropylene. Polyethylenimine was selected as an active agent for its reported radical scavenging and antimicrobial behaviour. Despite introduction of a hygroscopic and relatively low molecular weight active ligand, PP‐g‐PEI5 retained desirable low water vapour transmission rates (value) and excellent mechanical properties, supporting its covalent bonding to the base polymer. Interfacial pKa was determined via a pH‐dependent characterization of surface primary amine to be 10.07 (9.66–11.42, 95% CI), explaining its antioxidant mechanism at food and beverage relevant pH values (under 7) due to radical scavenging and not transition metal sequestering behaviour. Antimicrobial efficacy was demonstrated against gram‐positive Listeria monocytogenes. Finally, a viscosity‐dependent radical scavenging assay demonstrated the efficacy of PP‐g‐PEI5 as an antioxidant active packaging material in food products up to 812.9 cPs (2.98 nmol/cm2 Troloxeq). These results suggest that these active packaging materials would be most effective in inhibiting radical induced oxidative degradation in foods and beverages of acidic to neutral pH values and viscosities from liquid to loose gel, for example, preventing lipid oxidation in salad dressings or enhancing stability of natural colours in juices or smoothies. The reported active packaging material offers industry and consumers another tool for extending the shelf life of foods while addressing clean label market demands, which may help to decrease food waste by reducing losses post‐retail due to oxidative degradation and microbial growth.

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Synthesis and characterization of non-porous amorphous polymers for enhanced iodine adsorption

Wang,

Tang,

Long

et al. 2024

Aust. J. Chem.

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With the increasing demand for sustainable energy sources, the management of radioactive iodine, a byproduct of nuclear energy, has become critical for environmental safety and human health. This study presents the design and synthesis of non-porous amorphous polymers, specifically PEI-PD, derived from polyethylenimine (PEI) and pyromellitic dianhydride (PD), for the adsorption of iodine from aqueous and gaseous environments. The adsorbent exhibits high efficiency in capturing iodine, with a remarkable adsorption capacity of 4.43 g g–1 for volatile iodine and 1.43 g g–1 for liquid iodine. The adsorption process is governed by a pseudo-second-order kinetic model and follows the Langmuir isotherm, indicating a chemisorption mechanism driven by electrostatic attraction. The mechanism of iodine adsorption by the adsorbent was investigated using infrared spectroscopy and independent gradient modeling (IGMH), which helped to clarify types of weak interaction between the adsorbent and iodine and the adsorption sites. The study highlights the potential of PEI-PD as an effective material for the removal of radioactive iodine, contributing to the safe and sustainable management of nuclear waste.

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Glutaraldehyde and Glyoxal Crosslinked Polyethylenimine for Copper Ion Adsorption from Water

Cited by 3 publications

References 32 publications

Removal of Cu(II) from aqueous solutions by zinc oxide‐montmorillonite composite

Removal of Cu(II) from aqueous solutions by zinc oxide‐montmorillonite composite

Identifying Performance Conditions for a Radical Scavenging Active Packaging Material

Synthesis and characterization of non-porous amorphous polymers for enhanced iodine adsorption

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