Development of chitosan-poly(ethyleneimine) based double network cryogels and their application as superadsorbents for phosphate

Drăgan, Ecaterina Stela; Humelnicu, Doina; Dinu, Maria Valentina

doi:10.1016/j.carbpol.2019.01.054

Cited by 77 publications

(34 citation statements)

References 40 publications

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“…iron(III) and iron(II) salts) it is possible to easily produce magnetic chitosan micro/nanoparticles that can be further chemically modified by grafting new functional groups. The presence of hydroxyl and amine groups on chitosan backbone opens the way for many different chemical modifications: grafting of amino‐acids, carboxylic acid groups, poly(amines), hydrazinyl, amidoximes, phosphonic and aminophosphonic moieties. Combining the synthesis of magnetic microparticles (with limited impact of resistance to intraparticle diffusion and fast kinetics) and the grafting of functional groups (which improve the reactivity and/or the selectivity of the sorbent) contributes to enhance sorption properties.…”

Section: Introductionmentioning

confidence: 99%

Uranium(VI) and zirconium(IV) sorption on magnetic chitosan derivatives – effect of different functional groups on separation properties

Hamza

Gamal

Hussein

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND The recovery of metal ions from aqueous solutions for environmental preservation or resource saving requires the development of new sorbents with enhanced separation properties. A new process has been designed for the functionalization of magnetic chitosan microparticles with grafting of either amidoxime (AO‐AHC) or hydrazinyl amine (HZ‐AHC). Their sorption properties have been tested for the recovery of uranium(VI) and zirconium(IV) from aqueous solutions. RESULTS A wide range of analytical tools is used for characterizing not only the chemical modifications but also the interaction mode between the sorbent and target metal ions; including elemental analysis and titration, Fourier‐transform infrared (FTIR) spectroscopy and X‐ray photoelectron spectroscopy (XPS) characterizations, transmission electron microscopy (TEM) and scanning electron microscopy (SEM) observations, energy‐dispersive X‐ray spectroscopy (EDX) analysis and textural characterization. The optimum pH values were found in the range 4–5. The maximum sorption capacities depend on the metal and the kind of functionalization: up to 1.38 mmol U g−1 for AO‐AHC and up to 1.96 mmol Zr g−1 for HZ‐AHC. The small size of magnetic particles limits the contribution of diffusion mechanisms in the overall control of uptake kinetics and the equilibrium is reached within 40–60 min. Metal desorption is highly effective (almost quantitative over five successive cycles of sorption and desorption) using 0.3 M hydrochloric acid solutions. CONCLUSION AO‐AHC sorbent is more selective than HZ‐AHC in terms of separation of uranium(VI) from zirconium(IV), especially at pH close to 4. The results obtained in the treatment of acidic ore leachates confirm these trends. © 2019 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 99%

Uranium(VI) and zirconium(IV) sorption on magnetic chitosan derivatives – effect of different functional groups on separation properties

Hamza

Gamal

Hussein

et al. 2019

J of Chemical Tech & Biotech

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“…They are prepared by polymerization or crosslinking or simultaneous polymerization and crosslinking of monomeric or polymeric precursors [ 15 ]. Cryogels harness superior properties, e.g., fast reaction to the change in their environment, higher mechanical strength, and better elasticity due to their interconnected super-macroporous structures in comparison to conventional hydrogels [ 16 , 17 , 18 ]. For example, cryogels’ maximum swelling time is comparably faster than that of a common hydrogel.…”

Section: Introductionmentioning

confidence: 99%

Chondroitin Sulfate-Based Cryogels for Biomedical Applications

Demirci

Şahiner

Ari

et al. 2021

Gels

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Cryogels attained from natural materials offer exceptional properties in applications such as tissue engineering. Moreover, Halloysite Nanotubes (HNT) at 1:0.5 weight ratio were embedded into CS cryogels to render additional biomedical properties. The hemolysis index of CS cryogel and CS:HNT cryogels was calculated as 0.77 ± 0.41 and 0.81 ± 0.24 and defined as non-hemolytic materials. However, the blood coagulation indices of CS cryogel and CS:HNT cryogels were determined as 76 ± 2% and 68 ± 3%, suggesting a mild blood clotting capability. The maximum% swelling capacity of CS cryogel was measured as 3587 ± 186%, 4014 ± 184%, and 3984 ± 113%, at pH 1.0, pH 7.4 and pH 9.0, respectively, which were reduced to 1961 ± 288%, 2816 ± 192, 2405 ± 73%, respectively, for CS:HNT cryogel. It was found that CS cryogels can hydrolytically be degraded 41 ± 1% (by wt) in 16-day incubation, whereas the CS:HNT cryogels degraded by 30 ± 1 wt %. There is no chelation for HNT and 67.5 ± 1% Cu(II) chelation for linear CS was measured. On the other hand, the CS cryogel and CS:HNT cryogel revealed Cu(II) chelating capabilities of 60.1 ± 12.5%, and 43.2 ± 17.5%, respectively, from 0.1 mg/mL Cu(II) ion stock solution. Additionally, at 0.5 mg/mL CS, CS:HNT, and HNT, the Fe(II) chelation capacity of 99.7 ± 0.6, 86.2 ± 4.7% and only 11.9 ± 4.5% were measured, respectively, while no Fe(II) was chelated by linear CS chelated Fe(II). As the adjustable and controllable swelling properties of cryogels are important parameters in biomedical applications, the swelling properties of CS cryogels, at different solution pHs, e.g., at the solution pHs of 1.0, 7.4 and 9.0, were measured as 3587 ± 186%, 4014 ± 184%, and 3984 ± 113%, respectively, and the maximum selling% values of CS:HNT cryogels were determined as 1961 ± 288%, 2816 ± 192, 2405 ± 73%, respectively, at the same conditions. Alpha glucosidase enzyme interactions were investigated and found that CS-based cryogels can stimulate this enzyme at any CS formulation.

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“…Compared to conventional adsorbents such as activated carbon (AC) or synthetic ion exchangers, biopolymers represent valuable alternatives for sorption of various contaminants [1][2][3]. Consequently, over the years numerous biopolymers have been used as main matrix to develop composite-based sorbents for removal of heavy metal ions (HMIs) [4][5][6], dyes [7,8], or other pollutants [9,10]. One of the most promising biopolymers is chitosan (CS), a low-cost renewable polycation which is obtained from shells of crustaceans (crabs, shrimps, lobsters, etc.)…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Ethylenediaminetetraacetic Acid-Functionalized Chitosan Cryogels as Potential Sorbents of Heavy Metal Ions

Lazăr¹,

Dinu²,

Dinu³

2021

Mater. Plast.

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An original functionalization strategy is proposed here to design chitosan (CS)-based cryogels with ethylenediaminetetraacetic acid (EDTA) moieties. Cryogels with aligned micro-sized tubular structures were further engineered through an unidirectional freezing approach. Attachment of EDTA groups onto CS chains was proved by 1H-RMN and FT-IR spectroscopy. The formation of EDTA-functionalized 3D porous CS-based cryogels was demonstrated by several methods of characterization (FTIR spectroscopy, optical microscopy, SEM, porosity measurements, swelling behavior, copper (II) retention capacity). The sorption tests pointed out the high potential of EDTA-functionalized CS-based cryogels for heavy metal ions retention.

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Development of chitosan-poly(ethyleneimine) based double network cryogels and their application as superadsorbents for phosphate

Cited by 77 publications

References 40 publications

Uranium(VI) and zirconium(IV) sorption on magnetic chitosan derivatives – effect of different functional groups on separation properties

Uranium(VI) and zirconium(IV) sorption on magnetic chitosan derivatives – effect of different functional groups on separation properties

Chondroitin Sulfate-Based Cryogels for Biomedical Applications

Synthesis of Ethylenediaminetetraacetic Acid-Functionalized Chitosan Cryogels as Potential Sorbents of Heavy Metal Ions

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