Pore structure of gel chitosan membranes. III. Pressuredriven mass transport measurements

Krajewska, Barbara

doi:10.1016/0966-7822(95)00017-8

Cited by 9 publications

(5 citation statements)

References 16 publications

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“…Krajewska prepared chitosan gel membranes and extensively characterized their diffusion properties [233][234][235]. The permeability of metal ions through these membranes was measured and the permeability scale was as follows: Cu < Ni < Zn < Mn < Pb < Co < Cd < Ag [236].…”

Section: Membranesmentioning

confidence: 99%

Interactions of metal ions with chitosan-based sorbents: a review

Guibal

2004

Separation and Purification Technology

1,640

572

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Metal cations can be adsorbed by chelation on amine groups of chitosan in near neutral solutions. In the case of metal anions, the sorption proceeds by electrostatic attraction on protonated amine groups in acidic solutions. However, the presence of ligands and the pH strongly control sorption performance (sorption isotherm) and the uptake mechanism (changing the speciation of the metal may result in turning the chelation mechanism into the electrostatic attraction mechanism). Several examples are discussed with precious metals (Pd, Pt), oxo-anions (Mo, V) and heavy metals (Cu, Ag). Sorption performance (equilibrium uptake but also kinetics) is also strictly controlled by other structural parameters of the polymer (degree of deacetylation, crystallinity for example) that control swelling and diffusion properties of chitosan. The identification of the limiting steps of the sorption process helps in designing new derivatives of chitosan. Diffusion properties may be improved by physical modification of chitosan (manufacturing gel beads, decreasing crystallinity). Selectivity can be enhanced by chemical modification (grafting, for example, sulfur compounds). Several examples are discussed to demonstrate the versatility of the material. This versatility allows the polymer to be used under different forms (from water soluble form, to solid form, gels, fibers, hollow fibers ...) for polymer-enhanced ultrafiltration and sorption processes. These interactions of metal ions with chitosan can be used for the decontamination of effluents, for the recovery of valuable metals but also for the development of new materials or new processes involving metal-loaded chitosan. Several examples are cited in the design of new sorbing materials, the development of chitosan-supported catalysts, the manufacturing of new materials for opto-electronic applications or agriculture (plant disease treatment ...).

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Section: Membranesmentioning

confidence: 99%

Interactions of metal ions with chitosan-based sorbents: a review

Guibal

2004

Separation and Purification Technology

1,640

572

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“…Membranes offer several advantages over other separation techniques because of their low energy consumption, bulk production at continuous operation, and production of bio-products that are not thermally denatured. Industrial applications of membrane separation are wide-ranging and include fruit-juice condensation [ 17 ], artificial dialysis [ 18 ], desalination of seawater [ 19 ], and wastewater treatment [ 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Dependence of Water-Permeable Chitosan Membranes on Chitosan Molecular Weight and Alkali Treatment

et al. 2020

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Chitosan membranes were prepared by the casting method combined with alkali treatment. The molecular weight of chitosan and the alkali treatment influenced the water content and water permeability of the chitosan membranes. The water content increased as the NaOH concentration was increased from 1 to 5 mol/L. The water permeation flux of chitosan membranes with three different molecular weights increased linearly with the operating pressure and was highest for the membrane formed from chitosan with the lowest molecular weight. Membranes with a lower water content had a higher water flux. The membranes blocked 100% of compounds with molecular weights above methyl orange (MW = 327 Da). At 60 ≤ MW ≤ 600, the blocking rate strongly depended on the substance. The results confirmed that the membranes are suitable for compound separation, such as in purification and wastewater treatment.

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“…( 10) can also be written in linear form as shown in Eq. (11), which can be used together with experimental data to determine c m and k.…”

Section: Concentration Polarisationmentioning

confidence: 99%

Transport properties of chitosan membranes for zinc (II) removal from aqueous systems

Osifo

Neomagus

Merwe

et al. 2017

Separation and Purification Technology

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Pore structure of gel chitosan membranes. III. Pressuredriven mass transport measurements

Cited by 9 publications

References 16 publications

Interactions of metal ions with chitosan-based sorbents: a review

Interactions of metal ions with chitosan-based sorbents: a review

Dependence of Water-Permeable Chitosan Membranes on Chitosan Molecular Weight and Alkali Treatment

Transport properties of chitosan membranes for zinc (II) removal from aqueous systems

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