Surface-Modified Chitosan: An Adsorption Study of a “Tweezer-Like” Biopolymer with Fluorescein
| dc.contributor.author | Vafakish, Bahareh | |
| dc.contributor.author | Wilson, Lee | |
| dc.date.accessioned | 2024-10-29T20:32:57Z | |
| dc.date.available | 2024-10-29T20:32:57Z | |
| dc.date.issued | 2019-08-18 | |
| dc.description | The version of record of this article, first published in MDPI, is available online at Publisher’s website: https://doi.org/10.3390/surfaces2030035 | |
| dc.description.abstract | Tweezer-like adsorbents with enhanced surface area were synthesized by grafting aniline onto the amine sites of a chitosan biopolymer scaffold. The chemical structure and textural properties of the adsorbents were characterized by thermogravimetric analysis (TGA) and spectral methods, including Fourier transform infrared (FT-IR), nuclear magnetic resonance (1H- and, 13C-NMR) and scanning electron microscopy (SEM). Equilibrium solvent swelling results for the adsorbent materials provided evidence of a more apolar biopolymer surface upon grafting. Equilibrium uptake studies with fluorescein at ambient pH in aqueous media reveal a high monolayer adsorption capacity (Qm) of 61.8 mg·g−1, according to the Langmuir isotherm model. The kinetic adsorption profiles are described by the pseudo-first order kinetic model. 1D NMR and 2D-NOESY NMR spectra were used to confirm the role of π-π interactions between the adsorbent and adsorbate. Surface modification of the adsorbent using monomeric and dimeric cationic surfactants with long hydrocarbon chains altered the hydrophile-lipophile balance (HLB) of the adsorbent surface, which resulted in attenuated uptake of fluorescein by the chitosan molecular tweezers. This research contributes to a first example of the uptake properties for a tweezer-like chitosan adsorbent and the key role of weak cooperative interactions in controlled adsorption of a model anionic dye. | |
| dc.description.sponsorship | Natural Sciences and Engineering Research Council (NSERC), Discovery Grant Number: RGPIN 2016-06197 | |
| dc.description.version | Peer Reviewed | |
| dc.identifier.doi | 10.3390/surfaces2030035 | |
| dc.identifier.uri | https://hdl.handle.net/10388/16222 | |
| dc.language.iso | en | |
| dc.publisher | MDPI | |
| dc.rights | Attribution 2.5 Canada | en |
| dc.rights.uri | http://creativecommons.org/licenses/by/2.5/ca/ | |
| dc.subject | molecular tweezers | |
| dc.subject | surface modification | |
| dc.subject | adsorption | |
| dc.subject | chitosan | |
| dc.subject | grafting | |
| dc.subject | fluorescein | |
| dc.title | Surface-Modified Chitosan: An Adsorption Study of a “Tweezer-Like” Biopolymer with Fluorescein | |
| dc.type | Article |