Uptake of Methylene Blue from Aqueous Solution by Pectin–Chitosan Binary Composites
To address the need to develop improved hybrid biopolymer composites, we report on the preparation of composites that contain chitosan and pectin biopolymers with tunable adsorption properties. Binary biopolymer composites were prepared at variable pectin–chitosan composition in a solvent directed s...
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| Format: | Article |
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MDPI AG
2020-07-01
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| Series: | Journal of Composites Science |
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| Online Access: | https://www.mdpi.com/2504-477X/4/3/95 |
| _version_ | 1797562133271019520 |
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| author | Dexu Kong Lee D. Wilson |
| author_facet | Dexu Kong Lee D. Wilson |
| author_sort | Dexu Kong |
| collection | DOAJ |
| description | To address the need to develop improved hybrid biopolymer composites, we report on the preparation of composites that contain chitosan and pectin biopolymers with tunable adsorption properties. Binary biopolymer composites were prepared at variable pectin–chitosan composition in a solvent directed synthesis, dimethyl sulfoxide (DMSO) versus water. The materials were characterized using complementary methods (infrared spectroscopy, thermal gravimetric analysis, pH at the point-of-zero charge, and dye-based adsorption isotherms). Pectin and chitosan composites prepared in DMSO yielded a covalent biopolymer framework (CBF), whereas a polyelectrolyte complex (PEC) was formed in water. The materials characterization provided support that cross-linking occurs between amine groups of chitosan and the –COOH groups of pectin. CBF-based composites had a greater uptake of methylene blue (MB) dye over the PEC-based composites. Composites prepared in DMSO were inferred to have secondary adsorption sites for enhanced MB uptake, as evidenced by a monolayer uptake capacity that exceeded the pectin–chitosan PECs by 1.5-fold. This work provides insight on the role of solvent-dependent cross-linking of pectin and chitosan biopolymers. Sonication-assisted reactions in DMSO favor CBFs, while cross-linking in water yields PECs. Herein, composites with tunable structures and variable physicochemical properties are demonstrated by their unique dye adsorption properties in aqueous media. |
| first_indexed | 2024-03-10T18:24:10Z |
| format | Article |
| id | doaj.art-e41bb6bacbf142969495ea43bed47f40 |
| institution | Directory Open Access Journal |
| issn | 2504-477X |
| language | English |
| last_indexed | 2024-03-10T18:24:10Z |
| publishDate | 2020-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Composites Science |
| spelling | doaj.art-e41bb6bacbf142969495ea43bed47f402023-11-20T07:10:55ZengMDPI AGJournal of Composites Science2504-477X2020-07-01439510.3390/jcs4030095Uptake of Methylene Blue from Aqueous Solution by Pectin–Chitosan Binary CompositesDexu Kong0Lee D. Wilson1Saskatchewan Research Council, 125-15 Innovation Boulevard, Saskatoon, SK S7N 2X8, CanadaDepartment of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, SK S7N 5C9, CanadaTo address the need to develop improved hybrid biopolymer composites, we report on the preparation of composites that contain chitosan and pectin biopolymers with tunable adsorption properties. Binary biopolymer composites were prepared at variable pectin–chitosan composition in a solvent directed synthesis, dimethyl sulfoxide (DMSO) versus water. The materials were characterized using complementary methods (infrared spectroscopy, thermal gravimetric analysis, pH at the point-of-zero charge, and dye-based adsorption isotherms). Pectin and chitosan composites prepared in DMSO yielded a covalent biopolymer framework (CBF), whereas a polyelectrolyte complex (PEC) was formed in water. The materials characterization provided support that cross-linking occurs between amine groups of chitosan and the –COOH groups of pectin. CBF-based composites had a greater uptake of methylene blue (MB) dye over the PEC-based composites. Composites prepared in DMSO were inferred to have secondary adsorption sites for enhanced MB uptake, as evidenced by a monolayer uptake capacity that exceeded the pectin–chitosan PECs by 1.5-fold. This work provides insight on the role of solvent-dependent cross-linking of pectin and chitosan biopolymers. Sonication-assisted reactions in DMSO favor CBFs, while cross-linking in water yields PECs. Herein, composites with tunable structures and variable physicochemical properties are demonstrated by their unique dye adsorption properties in aqueous media.https://www.mdpi.com/2504-477X/4/3/95compositeschitosan–pectinadsorptionpolyelectrolyte complexcovalent biopolymer framework |
| spellingShingle | Dexu Kong Lee D. Wilson Uptake of Methylene Blue from Aqueous Solution by Pectin–Chitosan Binary Composites Journal of Composites Science composites chitosan–pectin adsorption polyelectrolyte complex covalent biopolymer framework |
| title | Uptake of Methylene Blue from Aqueous Solution by Pectin–Chitosan Binary Composites |
| title_full | Uptake of Methylene Blue from Aqueous Solution by Pectin–Chitosan Binary Composites |
| title_fullStr | Uptake of Methylene Blue from Aqueous Solution by Pectin–Chitosan Binary Composites |
| title_full_unstemmed | Uptake of Methylene Blue from Aqueous Solution by Pectin–Chitosan Binary Composites |
| title_short | Uptake of Methylene Blue from Aqueous Solution by Pectin–Chitosan Binary Composites |
| title_sort | uptake of methylene blue from aqueous solution by pectin chitosan binary composites |
| topic | composites chitosan–pectin adsorption polyelectrolyte complex covalent biopolymer framework |
| url | https://www.mdpi.com/2504-477X/4/3/95 |
| work_keys_str_mv | AT dexukong uptakeofmethylenebluefromaqueoussolutionbypectinchitosanbinarycomposites AT leedwilson uptakeofmethylenebluefromaqueoussolutionbypectinchitosanbinarycomposites |