Renewable Starch Carriers with Switchable Adsorption Properties

Karoyo, Abdalla H.; Dehabadi, Leila; Wilson, Lee D.

doi:10.1021/acssuschemeng.7b03345

Cited by 21 publications

(36 citation statements)

References 75 publications

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“…Scheme 2). A similar effect was reported by Karoyo et al [76] upon doping of starch biopolymers with cationic surfactants, where HLB character and adsorption properties of the biopolymer were dramatically altered for the resulting starch-surfactant complex. An apparent decrease of the HLB of the adsorbent surface had an adverse effect on the adsorption of FL that was more evident in the case of DDAB [77].…”

Section: Equilibrium Adsorption Of Fl Using Surfactant Modified Cs-ac-ansupporting

confidence: 80%

Surface-Modified Chitosan: An Adsorption Study of a “Tweezer-Like” Biopolymer with Fluorescein

Vafakish

Wilson

2019

Surfaces

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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.

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Section: Equilibrium Adsorption Of Fl Using Surfactant Modified Cs-ac-ansupporting

confidence: 80%

Surface-Modified Chitosan: An Adsorption Study of a “Tweezer-Like” Biopolymer with Fluorescein

Vafakish

Wilson

2019

Surfaces

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“…At pH = 7.5, the maximum Methylene Blue dye biosorption capacity of the aerogel was 785 mg/g, obtained by fitting the equilibrium data to the Langmuir isotherm, yielding the highest biosorption capacity for any reported reusable biosorbents prepared from biopolymers. The performance was also comparable to commercial activated carbon (980.3 mg/g) and an asreceived starch microparticle (716.3 mg/g), reported by Karoyo et al (2018). The maximum biosorption is about 86% of the amount calculated from charge stoichiometry, i.e., in reference to the chitosan carboxylated materials.…”

Section: A Recent Review Of the Literature On Dye Removal By Chitosansupporting

confidence: 73%

Dye removal by biosorption using cross-linked chitosan-based hydrogels

et al. 2019

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Synthetic dyes are an important class of recalcitrant organic compounds that are often found in the environment as a result of their wide industrial use. There are estimated to be more than 100,000 commercially available dyes. These substances are common contaminants, and many of them are known to be toxic or carcinogenic. Colored effluents from the industry is perceived by the public as an indication of the presence of a dangerous pollution. Even at very low concentrations, dyes are highly visible-an esthetic pollution-and modify the aquatic life and food chain, as a chemical contamination. Dye contamination of water is a major problem worldwide, and the treatment of wastewaters before their discharge into the environment has become a priority. Dyes are difficult to treat due to their complex aromatic structure and synthetic origin. In general, a combination of different physical, chemical and biological processes is often used to obtain the targeted water quality. Nonetheless, there is a need to develop new removal strategies and decolorization methods that are more effective, acceptable for industrial use and ecofriendly. Currently, there is increasing interest in the application of biological materials as effective adsorbents for dye removal. Among all the materials proposed, cross-linked chitosan-based hydrogels are the most popular biosorbents. These polymeric matrices are the object of numerous fundamental studies. In this review, after a brief description of the use of chitosan in wastewater treatment and the basic principles of chitosan-based hydrogels and biosorption, we focus on some of the work published over the past 5 years. Overall, these polymeric materials have demonstrated outstanding removal capabilities for some dyes. They might be promising biosorbents for environmental purposes.

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“…At pH ¼ 7.5, the maximum Methylene Blue dye biosorption capacity of the aerogel was 785 mg/g, obtained by fitting the equilibrium data to the Langmuir isotherm, yielding the highest biosorption capacity for any reported reusable biosorbents prepared from biopolymers. The performance was also comparable to commercial activated carbon (980.3 mg/g) and an as-received starch microparticle (716.3 mg/g), reported by Karoyo et al (2018). The maximum biosorption is about of 86% of the amount calculated from charge stoichiometry, i.e.…”

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confidence: 74%

Cross-Linked Chitosan-Based Hydrogels for Dye Removal

Crini

Torri

Lichtfouse

et al. 2019

Sustainable Agriculture Reviews 36

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Synthetic dyes are a major class of recalcitrant organic compounds, often occurring in the environment as a result of their wide industrial use. More than 100,000 dyes are commercially available. Synthetic dyes are common contaminants, many of them being toxic or carcinogenic. Colored effluents from industrial plant are also perceived by the public as an indication of the presence of a dangerous pollution. Even at very low concentrations, dyes are both highly visible, inducing an esthetic pollution, and impacting the aquatic life and food chain, as a chemical pollution. Dye contamination of water is a major problem worldwide and the treatment of wastewaters before their discharge into the environment is a priority. Dyes are difficult to treat due to their complex aromatic structure and synthetic origin. In general, a combination of different physical, chemical and biological processes is often used to obtain the desired water quality. However, there is a need to develop new removal strategies and decolorization methods that are more effective, acceptable in industrial use, and ecofriendly. Currently, there is an increasing interest

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Renewable Starch Carriers with Switchable Adsorption Properties

Cited by 21 publications

References 75 publications

Surface-Modified Chitosan: An Adsorption Study of a “Tweezer-Like” Biopolymer with Fluorescein

Surface-Modified Chitosan: An Adsorption Study of a “Tweezer-Like” Biopolymer with Fluorescein

Dye removal by biosorption using cross-linked chitosan-based hydrogels

Cross-Linked Chitosan-Based Hydrogels for Dye Removal

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