Chitosan-glutaraldehyde copolymers and their sorption properties

Poon, Louis; Wilson, Lee D.; Headley, John V.

doi:10.1016/j.carbpol.2014.02.086

Cited by 150 publications

(73 citation statements)

References 34 publications

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“…This can be attributed to the decrease of cooperative H-bonding along the chitosan backbone as a result of the PVCL grafting onto the glucosamine moieties of the chitosan. Hence, the thermal stability of the copolymer is strongly influenced by the degree of grafting (Poon, Wilson, & Headley, 2014). The last thermal degradation of the copolymer is in the range 370-470 • C, with a maximum degradation rate at 410 • C and corresponds to the pyrolysis of the grafted PVCL chains.…”

Section: Physical-chemical Characterizationmentioning

confidence: 99%

Effect of the molecular architecture on the thermosensitive properties of chitosan-g-poly(N-vinylcaprolactam)

Fernández‐Quiroz¹,

González-Gómez

Lizardi‐Mendoza

et al. 2015

Carbohydrate Polymers

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Section: Physical-chemical Characterizationmentioning

confidence: 99%

Effect of the molecular architecture on the thermosensitive properties of chitosan-g-poly(N-vinylcaprolactam)

Fernández‐Quiroz¹,

González-Gómez

Lizardi‐Mendoza

et al. 2015

Carbohydrate Polymers

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“…Previous work [12] [13] on chitosan copolymers revealed that the thermal stability of copolymers differed relative to pure chitosan. A chitosan film which had been neutralized in aqueous NaOH was compared with a film of similar composition which was washed repeatedly with distilled water.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

Investigation of Chitosan-PVA Composite Films and Their Adsorption Properties

Saskatoon¹,

Saskatchewan.²,

Canada³

2015

GEP

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Viscous aqueous solutions of chitosan and polyvinyl alcohol (PVA) were blended to enhance miscibility and avoid polymer phase separation. The mixtures were drop-casted and air dried to yield composite film materials that were characterized by equilibrium water uptake, physical stability in aqueous solution, and thermal stability. Chitosan/PVA blends have greater thermal stability, unique morphology, and reduced solubility in acidic solution, thus extending the useful pH range for chitosan as a sorbent material. The uptake properties of the films was investigated using methylene blue (MB) and a p-nitrophenol (PNP) dyes, where it was found that each single component polymer has greater uptake toward MB than PNP. A direct relationship between film composition (chitosan:PVA) with solution pH and the uptake of MB was observed. The results are in agreement with electrostatic interactions and contributions due to the hydrophobic effect for such composite materials.

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“…The synthesis of the chitosan cross-linked materials was adapted from another study (Poon et al 2014) with slight modification. In brief, CG1 was prepared as follows; 3 g of medium molecular weight chitosan was stirred in 600 mL of glacial acetic acid (5 % v/v) in a 1 L beaker until complete dissolution was achieved.…”

Section: Polymer Synthesismentioning

confidence: 99%

“…Chitosan is a versatile polysaccharide due to its amenability to synthetic modification such as grafting or cross-linking to produce materials with tunable physicochemical properties. Although there are reports (Kyzas et al 2008(Kyzas et al , 2014(Kyzas et al , 2013Poon et al 2014;Zhang et al 2014;Zhou et al 2014b) describing the sorption of chitosan-based materials with dyes and other organic species, there is only one study which reports the sorption of chlorophenols with chitosan copolymers that contain b-cyclodextrin (Zhou et al 2014b). Cross-linked polymers containing chitosan and glutaraldehyde have been reported with and without b-cyclodextrin.…”

Section: Introductionmentioning

confidence: 95%

“…In this study, we report the preparation and characterization of chitosan-glutaraldehyde (CG) (Poon et al 2014;Wilson and Xue 2013) polymers for the sequestration of several model agrochemicals with variable lipophilicity: pentachlorophenol (PCP), 2,4-dichlorophenol (2,4-DCP), 2,4-dichlorophenoxy acetic acid (2,4-D), dicamba and carbofuran (cf. Scheme 1) (Aly and Faust 1965;Crosby 1981;Faust and Aly 1963;Gold and Groffman 1993;Gupta 1994).…”

Section: Introductionmentioning

confidence: 99%

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Sequestration of agrochemicals from aqueous media using cross-linked chitosan-based sorbents

Mohamed

Wilson

2016

Adsorption

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The sorption properties are reported for chitosan and its cross-linked forms (chitosan-glutaraldehyde; CG) with some model agrochemical sorbates [pentachlorophenol (PCP), 2,4-dichlorophenol (2,4-DCP) and 2,4-dichlorophenoxy acetic acid (2,4-D), dicamba and carbofuran]. The CG cross-linked materials were prepared at variable C:G monomer mole ratios: 1:0.5 (CG1), 1:1 (CG2), (CG3). The sorbents were characterized using diffuse reflectance infrared Fourier transform spectroscopy, thermogravimetric analysis and a dye sorption method using phenolphthalein. The sorption studies were carried out in aqueous solution at pH 9 except for dicamba and carbofuran (pH 7). The isotherm results were evaluated by the Sips, Freundlich, and Langmuir models. The Sips model provided the ''best-fit'' results where the sorption capacity increased as the cross-linker content of the CG materials increased. The relative uptake for chitosan and its cross-linked forms adopted the following order: PCP [ 2,4-DCP [ 2,4-D. In the case of dicamba and carbofuran, the former had a higher sorptive uptake. The variable uptake of the sorbates were attributed to their relative lipophilicity where the main driving force of these solid-solution systems relates to hydrophobic effects, in accordance with the tunable physicochemical properties of the chitosan sorbent materials.

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Chitosan-glutaraldehyde copolymers and their sorption properties

Cited by 150 publications

References 34 publications

Effect of the molecular architecture on the thermosensitive properties of chitosan-g-poly(N-vinylcaprolactam)

Effect of the molecular architecture on the thermosensitive properties of chitosan-g-poly(N-vinylcaprolactam)

Investigation of Chitosan-PVA Composite Films and Their Adsorption Properties

Sequestration of agrochemicals from aqueous media using cross-linked chitosan-based sorbents

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