Stimuli sensitive super-macroporous cryogels based on photo-crosslinked 2-hydroxyethylcellulose and chitosan

Stoyneva, Veselina; Momekova, Denitsa; Kostova, Bistra; Petrov, Petar

doi:10.1016/j.carbpol.2013.08.095

Cited by 51 publications

(34 citation statements)

References 17 publications

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“…However, chitosan can be solubilized in diluted aqueous solutions. Cellulose derivatives like 2-hydroxyethylcellulose (HEC) are widely used in environmental studies due to its solubility in water [15, 16]. …”

Section: Introductionmentioning

confidence: 99%

Simple and green technique for sequestration and concentration of silver nanoparticles by polysaccharides immobilized on glass beads in aqueous media

Kibeche

Dionne

Brion-Roby

et al. 2015

Chemistry Central Journal

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BackgroundEngineered nanoparticles have unique properties compared to bulk materials and their commercial uses growing rapidly. They represent a potential risk for environment and health and could be eventually released in water. Silver nanoparticles (Ag NP) are applied in various products and are well-known for their antibacterial properties. Nowadays, pre-concentration and separation methods for Ag NP possess some limitations. Here, we present a simple, green method to sequestrate and concentrate Ag NP from different aqueous media.ResultsSupported polysaccharides on glass beads synthesized in water by a single step reaction show high sequestration capacity of citrate-coated Ag NP in aqueous media. Supported polysaccharides were characterized by infrared spectroscopy, scanning electron microscopy (SEM) and elemental analysis. Sequestration of 83.0 % of Ag NP was attained from a 20 μg.L−1 aqueous solution with supported chitosan in water whereas supported 2-hydroxyethylcellulose (HEC) reached 64.0 % in synthetic seawater in 2 h. The influence of polymer/glass beads ratio and molecular weight of polysaccharides was also studied. The effect of the salinity and humic acids on sequestration of Ag NP was investigated. Supported polymers have shown high performance for sequestration of ionic silver. Sequestration of 82.5 % and 80.8 % were obtained from a 60 μg.L−1 silver ion (as nitrate salt) with supported HEC and chitosan, respectively. Sequestrated Ag NP was characterized with transmission electron microscopy (TEM) where images showed Ag NP with unchanged size and shape.ConclusionsThis sequestration method, involving green synthesis, allows efficient concentration and characterization of Ag NP from different aqueous media. This simple and fast method is a potential sustainable technique for elimination of Ag NP and ionic silver from waste waters and waters at different salinities.

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Section: Introductionmentioning

confidence: 99%

Simple and green technique for sequestration and concentration of silver nanoparticles by polysaccharides immobilized on glass beads in aqueous media

Kibeche

Dionne

Brion-Roby

et al. 2015

Chemistry Central Journal

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“…The superabsorbent hydrogels of this process is so-called "cryogels", which formed by the association of drug delivery, such as metronidazole [31]. From this research, we convince that the cellulose-based superabsorbent hydrogels will be a kind of promising drug delivery system in a near future Electron beam irradiation technique was also applied to synthesis the cellulose-based superabsorbent hydrogels [32].…”

Section: Physical Synthesis Methodsmentioning

confidence: 95%

Advances in cellulose-based superabsorbent hydrogels

Bao

2015

RSC Adv.

152

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This contribution provides a brief overview of recent progress in cellulose-based superabsorbent hydrogels fabrication approaches, materials and promising applications. At first, different synthesis methods were introduced, including physical crosslink as well as chemical crosslink ways. Second, some of the cellulose series original materials were introduced in this work. In addition, some applications and future research in cellulose-based superabsorbent hydrogels were also discussed in this review.

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“…Cryogels were prepared at initial polymer concentration 1 mass%, polymer molar mass 1,300,000 g/mol, 2 mass% BBTMAC, irradiation time 2 min. Reprinted from [12] with permission from Elsevier pH-responsive properties [18]. The increase in chitosan content in the polymer co-network increases the mechanical strength of cryogels (Fig.…”

Section: Cryogels From Water-soluble High Molar Mass Polymersmentioning

confidence: 97%

“…Cryogels were prepared at a freezing temperature of -20 C, 5 mass% H 2 O 2 , 30 mass% BisAAm, initial polymer concentration 1.5 mass%, irradiation time 2 min. Reprinted from [18] with permission from Elsevier (copolymer molar mass 1,250,000 g/mol; molar degree of modification 32, 37, and 40 %), the maximum value of the GF yield was achieved at an initial copolymer concentration of 2 mass%, irradiation time 4 min (irradiation dose 22.8 J/cm 2 ), and 5 mass% BBTMAC.…”

Section: Cryogels From Water-soluble High Molar Mass Polymersmentioning

confidence: 99%