Polyelectrolyte CASA hydrogels for uptake of uranyl ions from aqueous solutions

Karadağ, Erdener; Üzüm, Ömer Barış; Kundakcı, Semiha; Saraydın, Dursun

doi:10.1002/app.25397

Cited by 50 publications

(52 citation statements)

References 21 publications

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“…As a result of their swelling ability, these materials have received increased attention because of their potential application in bioengineering, biomedicine, food industries, separation processes, water purification, chromatography and controlled drug delivery systems. [1][2][3][4][5][6][7][8][9][10] The great capacity of water absorption by these materials is particularly important in the biomaterials field, given the relatively high water content of body tissues. Hydrogels can be referred to as physical, when the crosslinks result from electrostatic forces, hydrogen bonds, hydrophobic interactions or chain entanglements, or as chemical, when covalent bonds are responsible for the crosslinking.…”

Section: Introductionmentioning

confidence: 99%

Hydrogels of cellulose acetate crosslinked with pyromellitic dianhydride: part I: synthesis and swelling kinetics

et al. 2013

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Recebido em 3/5/12; aceito em 8/8/12; publicado na web em 7/12/12This work describes the synthesis of hydrogels of cellulose acetate (AC) crosslinked with 1,2,4,5-benzenotetracarboxylic dianhydride (PMDA). The crosslinking reaction was monitored by FTIR. Analysis of aromatic fragments from the alkaline hydrolysis of the gels by UV spectroscopy indicated that an increase in the stoichiometric ratio of dianhydride resulted in higher degrees of crosslinking. The non-porous nature of the gels was confirmed by analysis of nitrogen adsorption. Water absorption isotherms showed that as the temperature and degree of crosslinking increased, the percentage of water absorbed at equilibrium (%S eq ) also increased. The hydrogels presented second order swelling kinetics.

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Section: Introductionmentioning

confidence: 99%

Hydrogels of cellulose acetate crosslinked with pyromellitic dianhydride: part I: synthesis and swelling kinetics

et al. 2013

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“…Due to its swell-ing ability in water, hydrophilicity, biocompatibility, and no toxicity, hydrogels have been utilized in a wide range of biological, medical, pharmaceutical, environmental applications [8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…For this reason, they have been in several studies such as "for water purification [8], for removal of some dyes from aqueous solutions [9,11,[15][16][17][18], for removal of toxic metal ions with magnetic hydrogels [10], for uptake of metal ions from aqueous solutions [10,11,13,18], for uptake of uranyl ions from aqueous solutions [12,18] "as water purification agents.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Swelling/Sorption Characteristics of Highly Swollen AAm/AMPS Hydrogels and Semi IPNs with PEG as Biopotential Sorbent

Karadağ¹,

Kundakcı²,

Üzüm³

2011

JEAS

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The aim of this study was to investigate the equilibrium swelling and sorption properties of chemically crosslinked copolymeric hydrogels as biopotential sorbent consisting of acrylamide (AAm) and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS). Semi-interpenetrating polymer network (semi IPNs) hydrogel, composed of AAm with AMPS as co-monomer, with poly (ethylene glycol) (PEG) and a multifunctional crosslinker such as trimethylolpropane triacrylate (TMPTA) was prepared. AAm/AMPS hydrogels and AAm/AMPS/PEG semi IPNs were synthesized by free radical solution polymerization by using ammonium persulphate (APS)/N,N,N',N'-tetramethylethylenediamine (TEMED) as redox initiating pair. Swelling experiments were performed in water, 0.01 M and 0.03 M aqueous urea solutions at 25˚C, gravimetrically. The hydrogels showed enormous swelling in aqueous urea/water medium and displayed swelling characteristics that were highly depended on the chemical composition of the hydrogels. FTIR spectroscopy was used to identify the presence of different repeating units in the semi IPNs. Some swelling and diffusion characteristics were calculated for different semi IPNs and hydrogels prepared under various formulations. For sorption of cationic dye, Lauths violet into the hydrogels was studied by batch sorption technique at 25˚C. Dye removal capacity, adsorption percentage and partition coefficient of the hydrogels was investigated. Swelling and dye sorption properties of AAm/AMPS hydrogels and AAm/AMPS/PEG semi IPNs were investigated as a function of chemical composition of the hydrogels.

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“…7 (section 3.2.4.1) and curve fitting. In our case, non-Fickian diffusion was observed, because the n value was 0.874 (Karadağ et al, 2002).…”

Section: Swelling Of Thiopasp Hydrogelsmentioning

confidence: 48%

“…45-0.5 corresponds to Fickian diffusion, while a value of 0.5-1 means that the diffusion mode is nonFickian (Karadağ et al, 2002).…”

Section: Swelling Data Analysismentioning

confidence: 99%

Mucoadhesive polymers in ophthalmic therapy

Horvát¹

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Polyelectrolyte CASA hydrogels for uptake of uranyl ions from aqueous solutions

Cited by 50 publications

References 21 publications

Hydrogels of cellulose acetate crosslinked with pyromellitic dianhydride: part I: synthesis and swelling kinetics

Hydrogels of cellulose acetate crosslinked with pyromellitic dianhydride: part I: synthesis and swelling kinetics

Investigation of Swelling/Sorption Characteristics of Highly Swollen AAm/AMPS Hydrogels and Semi IPNs with PEG as Biopotential Sorbent

Mucoadhesive polymers in ophthalmic therapy

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