Sulfur derivatives of chitosan for palladium sorption

Guibal, Eric; Sweeney, Néill; Vincent, Thierry; Tobin, John M.

doi:10.1016/s1381-5148(01)00110-9

Cited by 165 publications

(91 citation statements)

References 33 publications

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“…To reduce the effect of chloride anions it may be useful to increase the density of sorption sites by grafting new functional groups, for example poly(ethyleneimine), or to graft on the chitosan backbone new functional groups (such as sulfur containing groups) less sensitive to the presence of competitor anions. [39][40][41] Figure 8 shows the influence of pH on platinum sorption capacity using chitosan cross-linked with glutaraldehyde. The optimum pH was found again in the range pH 2-3.…”

Section: Platinum and Palladium Sorption -Influence Of Metal Complexamentioning

confidence: 99%

Recovery of Metal Ions by Chitosan: Sorption Mechanisms and Influence of Metal Speciation

Navarro

Guzmán

Saucedo

et al. 2003

Macromolecular Bioscience

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Chitosan is characterized by a high affinity for metal ions due to its high content of amine groups. The sorption mechanism depends on both the protonation of these amine groups and the speciation of metal ions. Metal cations may be adsorbed at pH close to neutrality by chelation mechanism while metal anions can be adsorbed in acidic solutions through ionic interactions with protonated amine groups. Several examples are considered. The first example focuses on Cd sorption, which proceeds by a chelation mechanism on free non‐protonated amine groups in neutral media. In acidic solutions the protonation of amine groups limits the ability of amine groups to complex Cd. The cross‐linking of chitosan with glutaraldehyde also results in a dramatic decrease of sorption properties due to the decrease in the density of complexation sites available for sorption. The sorption of vanadium(V) and molybdenum(VI) illustrates the high capacity of chitosan for the sorption of oxo‐anions. They are very efficiently sorbed in acidic solutions by ionic interactions. The correlation of sorption capacities with the distribution of metal species shows that the sorbent has a greater affinity for highly charged anionic species. The sorption of complex anionic species such as chloro‐complexes of Pd and Pt; and that of copper complexed with organic ligands have also been studied. The optimum conditions for sorption are obtained when anionic complexes predominate in the solution. The chemical modification of chitosan, obtained by grafting of sulfur compounds, allows modifying the sorption mechanism: the ion‐exchange polymer is transformed to a dual ion‐exchange and chelating polymer.Copper sorption isotherm in presence of sodium citrate (0.004 M) (RNH: fraction of protonated amine groups; ACuC: total fraction of anionic copper complexes; Cu‐FAL: total fraction of copper‐free anionic ligands).magnified imageCopper sorption isotherm in presence of sodium citrate (0.004 M) (RNH: fraction of protonated amine groups; ACuC: total fraction of anionic copper complexes; Cu‐FAL: total fraction of copper‐free anionic ligands).

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Section: Platinum and Palladium Sorption -Influence Of Metal Complexamentioning

confidence: 99%

Recovery of Metal Ions by Chitosan: Sorption Mechanisms and Influence of Metal Speciation

Navarro

Guzmán

Saucedo

et al. 2003

Macromolecular Bioscience

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“…37 The treatment of glutaraldehyde crosslinking induces new linkages between the chitosan chains allowing the polymer to be highly resistant to dissolution even in harsh solutions such as hydrochloric molar solutions. 38 Glutaraldehyde has been used for cadmium recovery on chitosan beads. 39 In this study, chitosan powder was crosslinked with glutaraldehyde and its solubility was measured before and after crosslinking.…”

Section: Introductionmentioning

confidence: 99%

Removal of Hg²⁺ from aqueous solution using alginate gel containing chitosan

Chang¹,

Huang²,

Hsu³

et al. 2007

J of Applied Polymer Sci

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Glutaraldehyde-crosslinked alginate gel containing chitosan (AGCC) used for the removal of Hg 2þ ions from aqueous solutions. Three bead sizes were obtained and performed to study the uptake equilibrium and kinetics of Hg 2þ by AGCC (ca. an hour). The adsorption capacity was found to be independent of adsorbent particle size indicating that sorption occurs in the whole AGCC bead. A high initial rate of Hg 2þ uptake was followed by a slower uptake rate suggesting intraparticle diffusion as the rate-limiting step. The rate of Hg 2þ uptake increases with decreasing AGCC bead size. AGCC also enhanced the rate and the capacity of Hg 2þ adsorption. The maximum Hg 2þ adsorption capacity of AGCC was found 667 mg/g, which is over 20 times higher than that of alginate bead. Our results reveal the well-distributed chitosan powders in the alginate gel bead and Hg 2þ ions can reach inside the chitosan bead. It indicates the feasibility of using AGCC as metal adsorbent at low pH values, and allows the regeneration of adsorbent. Hg 2þ ions adsorbed on AGCC bead were desorbed effectively about 95% by H 2 SO 4 at the third cycle. The use of AGCC for the removal of Hg 2þ ions from the waste streams appears to be promising.

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“…Those methods that used chemically modified electrodes by chitosan are active topics. The amino group on the chitosan is responsible for the chelation of many metal cation Cu [18][19][20] . In resent years, Chitosan has been developed into membrane material of electrode for preparation of chemical sensors and use to the detection of metalions.…”

Section: Determination Of Metal Ionsmentioning

confidence: 99%

Application and Preparation of Chitosan Electrochemical Sensor

Tan¹

2015

Proceedings of the 2015 International Power, Electronics and Materials Engineering Conference

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Abstract. During the last decade, the sensors based on chitosan had been an active research topic due to its great practical value. The sensors had showed excellent superiority, low cost, ease of fabrication, fast response time and nice repeatability. This review discusses the preparation and application of sensors based on in metallic ion detection, non-metallic ions detection, organic detection and biosensors are reviewed, and future applications are prospected.

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Sulfur derivatives of chitosan for palladium sorption

Cited by 165 publications

References 33 publications

Recovery of Metal Ions by Chitosan: Sorption Mechanisms and Influence of Metal Speciation

Recovery of Metal Ions by Chitosan: Sorption Mechanisms and Influence of Metal Speciation

Removal of Hg²⁺ from aqueous solution using alginate gel containing chitosan

Application and Preparation of Chitosan Electrochemical Sensor

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Sulfur derivatives of chitosan for palladium sorption

Cited by 165 publications

References 33 publications

Recovery of Metal Ions by Chitosan: Sorption Mechanisms and Influence of Metal Speciation

Recovery of Metal Ions by Chitosan: Sorption Mechanisms and Influence of Metal Speciation

Removal of Hg2+ from aqueous solution using alginate gel containing chitosan

Application and Preparation of Chitosan Electrochemical Sensor

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Product

Resources

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Removal of Hg²⁺ from aqueous solution using alginate gel containing chitosan