Binding of ions to chitosan—selectivity studies

Vold, Inger Mari Nygård; Vårum, Kjell M.; Guibal, Eric; Smidsrød, Olav

doi:10.1016/j.carbpol.2003.07.001

Cited by 192 publications

(103 citation statements)

References 30 publications

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“…Kim (2004) reported a similar order of metal affinity sequences for chitosan: Cu(II) > Fe(II) > Zn(II) > Cd(II). Vold et al (2003) used the selectivity coefficient, k …”

Section: Properties Of Chitosanmentioning

confidence: 99%

“…Chitosan (Vold et al 2003). Initially, it was proposed that the interaction between metal ions and chitosan was due to ion exchange, sorption and chelation (Muzzarelli et al 1986).…”

Section: Properties Of Chitosanmentioning

confidence: 99%

“…Initially, it was proposed that the interaction between metal ions and chitosan was due to ion exchange, sorption and chelation (Muzzarelli et al 1986). However, Vold et al (2003) suggested that the metal sorption selectivity of chitosan did not depend upon the ionic strength and pH of the solution. Sorption of uranyl ions by chitosan is independent of pH (Piron and Domard 1998), which indicates that the sorption mechanism of metal ions with chitosan is inclined to complexation, rather than electrostatic attraction.…”

Section: Properties Of Chitosanmentioning

confidence: 99%

See 2 more Smart Citations

Environmental Applications of Chitosan and Its Derivatives

Yong

Shrivastava

Srivastava

et al. 2014

Reviews of Environmental Contamination and Toxicology Volume 233

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Chitosan originates from the seafood processing industry and is one of the most abundant of bio-waste materials. Chitosan is a by-product of the alkaline deacetylation process of chitin. Chemically, chitosan is a polysaccharide that is soluble in acidic solution and precipitates at higher pHs. It has great potential for certain environmental applications, such as remediation of organic and inorganic contaminants, including toxic metals and dyes in soil, sediment and water, and development of contaminant sensors. Traditionally, seafood waste has been the primary source of chitin. More recently, alternative sources have emerged such as fungal mycelium, mushroom and krill wastes, and these new sources of chitin and chitosan may overcome seasonal supply limitations that have existed. The production of chitosan from the above-mentioned waste streams not only reduces waste volume, but alleviates pressure on landfills to which the waste would otherwise go. Chitosan production involves four major steps, viz., deproteination, demineralization, bleaching and deacetylation. These four processes require excessive usage of strong alkali at different stages, and drives chitosan's production cost up, potentially making the application of high-grade chitosan for commercial remediation untenable. Alternate chitosan processing techniques, such as microbial or enzymatic processes, may become more cost-effective due to lower energy consumption and waste generation. Chitosan has proved to be versatile for so many environmental applications, because it possesses certain key functional groups, including - OH and -NH2 . However, the efficacy of chitosan is diminished at low pH because of its increased solubility and instability. These deficiencies can be overcome by modifying chitosan's structure via crosslinking. Such modification not only enhances the structural stability of chitosan under low pH conditions, but also improves its physicochemical characteristics, such as porosity, hydraulic conductivity, permeability, surface area and sorption capacity. Crosslinked chitosan is an excellent sorbent for trace metals especially because of the high flexibility of its structural stability. Sorption of trace metals by chitosan is selective and independent of the size and hardness of metal ions, or the physical form of chitosan (e.g., film, powder and solution). Both -OH and -NH2 groups in chitosan provide vital binding sites for complexing metal cations. At low pH, -NH3 + groups attract and coagulate negatively charged contaminants such as metal oxyanions, humic acids and dye molecules. Grafting certain functional molecules into the chitin structure improves sorption capacity and selectivity for remediating specific metal ions. For example, introducing sulfur and nitrogen donor ligands to chitosan alters the sorption preference for metals. Low molecular weight chitosan derivatives have been used to remediate metal contaminated soil and sediments. They have also been applied in permeable reactive barriers to remediate metals in soil and groun...

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“…Kim (2004) reported a similar order of metal affinity sequences for chitosan: Cu(II) > Fe(II) > Zn(II) > Cd(II). Vold et al (2003) used the selectivity coefficient, k …”

Section: Properties Of Chitosanmentioning

confidence: 99%

“…Chitosan (Vold et al 2003). Initially, it was proposed that the interaction between metal ions and chitosan was due to ion exchange, sorption and chelation (Muzzarelli et al 1986).…”

Section: Properties Of Chitosanmentioning

confidence: 99%

Section: Properties Of Chitosanmentioning

confidence: 99%

See 1 more Smart Citation

Environmental Applications of Chitosan and Its Derivatives

Yong

Shrivastava

Srivastava

et al. 2014

Reviews of Environmental Contamination and Toxicology Volume 233

View full text Add to dashboard Cite

show abstract

“…It is also an abundant, natural, nontoxic, biodegradable and biocompatible polymer. It is well known to be a good natural adsorbent for metal ions due to important properties including a large number of hydroxyl groups which confers, a large number of primary amino groups used as adsorption sites, and a flexible polymer chain which provides suitable configuration for complexation of metal ions [8,9]. Macromolecular superstructures of chitosan with different forms such as gels and hydrogels networks, polymeric resins, beads, membranes, fibers or composite materials can be prepared by physical and chemical modifications as mentioned by Crini [8].…”

Section: Introductionmentioning

confidence: 99%

Optimization of nickel ions removal from aqueous solutions by chitosan-polyethylene oxide electrospun nanofibers

Lakhdhar¹,

Mangin²,

Chabot³

2015

WIT Transactions on Ecology and the Environment

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Chitosan-polyethylene oxide (Cs/PEO) electrospun nanofibers were prepared by electrospinning process in order to remove nickel ions from aqueous solutions by a chelation mechanism. Response surface methodology (RSM) was used to optimize adsorption efficiency of nickel ions on Cs/PEO nanofibers. The combined effects of adsorption operating parameters, namely, the adsorbent dose, initial nickel ions concentration, temperature, and NaCl concentration, on adsorption efficiency were investigated using a central composite face-centered (CCF) design. Results showed that an optimal adsorption capacity of 64.4% was obtained under the following conditions: 75 mg of adsorbent dose, initial nickel concentration of 100 ppm, a temperature of 75°C, and a 1M NaCl concentration.

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“…The type of interaction depends on the metal ion, its chemistry, and the pH of the solution. [8] Physical and chemical modifications of chitosan have been made to improve the selectivities and the capacities for metals ions. In addition, many studies concerning the uptake of copper and nickel by chitosan and its derivatives have indicated pH influence on the adsorption efficiency.…”

Section: Introductionmentioning

confidence: 99%

Selective Removal of Copper(II) and Nickel(II) from Aqueous Solution Using the Chemically Treated Chitosan: Factorial Design Evaluation

Sepehran

Nasernejad

Edrissi

2008

Metall Mater Trans B

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In the present work, the adsorption of Cu(II) and Ni(II) ions from their mixture solution by raw and chemically modified chitosan has been studied. The full factorial design methodology was employed to reduce the total number of experiments. Analysis of variance and student's t-test have been performed for Ni(II) and Cu(II) removal efficiency and for the ratio of their removal. The two main factors considered were pH of solution (at two levels 2.8 and 4.8) and contact time (at two levels: 20 minutes and 18 hours). The third factor was a qualitative factor at two levels (raw chitosan and chemically modified chitosan). Among the factors studied, chemical modification of chitosan was the most effective factor for the ratio of nickel and copper removal efficiency. It was found that pH has no significant effect on Ni(II) uptake. The result from this study indicates that the adsorption selectivity of chitosan can be enhanced by chemical treatment and regulating pH and contact time.

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Binding of ions to chitosan—selectivity studies

Cited by 192 publications

References 30 publications

Environmental Applications of Chitosan and Its Derivatives

Environmental Applications of Chitosan and Its Derivatives

Optimization of nickel ions removal from aqueous solutions by chitosan-polyethylene oxide electrospun nanofibers

Selective Removal of Copper(II) and Nickel(II) from Aqueous Solution Using the Chemically Treated Chitosan: Factorial Design Evaluation

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