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Recent modifications of chitosan for adsorption applications: a critical and systematic review.

Kyzas GZ, Bikiaris DN - Mar Drugs (2015)

Bottom Line: These functional groups can help in establishing positions for modification.Based on the learning from previously published works in literature, researchers have achieved a modification of chitosan with a number of different functional groups.This work summarizes the published works of the last three years (2012-2014) regarding the modification reactions of chitosans (grafting, cross-linking, etc.) and their application to adsorption of different environmental pollutants (in liquid-phase).

View Article: PubMed Central - PubMed

Affiliation: Laboratory of Polymer Chemistry and Technology, Division of Chemical Technology, Department of Chemistry, Aristotle University of Thessaloniki, GR-541 24 Thessaloniki, Greece. drkyzas@chem.auth.gr.

ABSTRACT
Chitosan is considered to be one of the most promising and applicable materials in adsorption applications. The existence of amino and hydroxyl groups in its molecules contributes to many possible adsorption interactions between chitosan and pollutants (dyes, metals, ions, phenols, pharmaceuticals/drugs, pesticides, herbicides, etc.). These functional groups can help in establishing positions for modification. Based on the learning from previously published works in literature, researchers have achieved a modification of chitosan with a number of different functional groups. This work summarizes the published works of the last three years (2012-2014) regarding the modification reactions of chitosans (grafting, cross-linking, etc.) and their application to adsorption of different environmental pollutants (in liquid-phase).

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Interactions between pramipexole and CsSLF. Reprinted with permission from [84], Copyright © 2013 Elsevier.
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marinedrugs-13-00312-f009: Interactions between pramipexole and CsSLF. Reprinted with permission from [84], Copyright © 2013 Elsevier.

Mentions: In our previous study, we synthesized two chitosan modified derivatives which were cross-linked with glutaraldehyde and grafted with sulfonate groups (CsSLF) or N-(2-carboxybenzyl) groups (CsNCB) [84]. A pharmaceutical compound (pramipexole) was tested for adsorption experiments. After running pH-effect experiments, the optimum pH value was 10. After fitting to the Langmuir-Freundlich equation, the Qm values were calculated as 337 and 307 mg/g at 25 °C for CsSLF and CsNCB, respectively. In this work, the most interesting aspect is the adsorption mechanism suggested for both materials. For example, in the case of CsSLF, the proposed mechanism is presented below (Figure 9).


Recent modifications of chitosan for adsorption applications: a critical and systematic review.

Kyzas GZ, Bikiaris DN - Mar Drugs (2015)

Interactions between pramipexole and CsSLF. Reprinted with permission from [84], Copyright © 2013 Elsevier.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4306939&req=5

marinedrugs-13-00312-f009: Interactions between pramipexole and CsSLF. Reprinted with permission from [84], Copyright © 2013 Elsevier.
Mentions: In our previous study, we synthesized two chitosan modified derivatives which were cross-linked with glutaraldehyde and grafted with sulfonate groups (CsSLF) or N-(2-carboxybenzyl) groups (CsNCB) [84]. A pharmaceutical compound (pramipexole) was tested for adsorption experiments. After running pH-effect experiments, the optimum pH value was 10. After fitting to the Langmuir-Freundlich equation, the Qm values were calculated as 337 and 307 mg/g at 25 °C for CsSLF and CsNCB, respectively. In this work, the most interesting aspect is the adsorption mechanism suggested for both materials. For example, in the case of CsSLF, the proposed mechanism is presented below (Figure 9).

Bottom Line: These functional groups can help in establishing positions for modification.Based on the learning from previously published works in literature, researchers have achieved a modification of chitosan with a number of different functional groups.This work summarizes the published works of the last three years (2012-2014) regarding the modification reactions of chitosans (grafting, cross-linking, etc.) and their application to adsorption of different environmental pollutants (in liquid-phase).

View Article: PubMed Central - PubMed

Affiliation: Laboratory of Polymer Chemistry and Technology, Division of Chemical Technology, Department of Chemistry, Aristotle University of Thessaloniki, GR-541 24 Thessaloniki, Greece. drkyzas@chem.auth.gr.

ABSTRACT
Chitosan is considered to be one of the most promising and applicable materials in adsorption applications. The existence of amino and hydroxyl groups in its molecules contributes to many possible adsorption interactions between chitosan and pollutants (dyes, metals, ions, phenols, pharmaceuticals/drugs, pesticides, herbicides, etc.). These functional groups can help in establishing positions for modification. Based on the learning from previously published works in literature, researchers have achieved a modification of chitosan with a number of different functional groups. This work summarizes the published works of the last three years (2012-2014) regarding the modification reactions of chitosans (grafting, cross-linking, etc.) and their application to adsorption of different environmental pollutants (in liquid-phase).

Show MeSH