Chitosan-thioglycolic acid composite cross-linked with glutaraldehyde for selective recovery of Au(III) ions from e-waste leachate via reduction-coupled adsorption and incineration

James, Greeshma; Tran, Duy Tho; Chaudhuri, Haribandhu; Song, Myung-Hee; Yun, Yeoung-Sang

doi:10.1016/j.chemosphere.2024.143282

Chemosphere

2024

DOI: 10.1016/j.chemosphere.2024.143282

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Chitosan-thioglycolic acid composite cross-linked with glutaraldehyde for selective recovery of Au(III) ions from e-waste leachate via reduction-coupled adsorption and incineration

Greeshma James,

Duy Tho Tran,

Haribandhu Chaudhuri

et al.

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2024

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Hybrid Chitosan Biosorbents: Tunable Adsorption at Surface and Micropore Domains

Udoetok,

Mohamed,

Wilson

2024

Biomimetics

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Herein, we report a study that provides new insight on the knowledge gaps that relate to the role of biopolymer structure and adsorption properties for chitosan adsorbents that are cross-linked with glutaraldehyde. The systematic modification of chitosan cross-linked with glutaraldehyde (CG) and its quaternized forms (QCG) was studied in relation to the reaction conditions: mole ratios of reactants and pH conditions. Complementary adsorbent characterization employed 13C NMR/FTIR spectroscopy, TGA and DSC, point-zero-charge (PZC), solvent swelling, and sorption studies using selected dye probes. The spectral and thermal techniques provide complementary evidence that affirm the key role of cross-linker content and quaternization on variation of the physicochemical properties of chitosan. The PZC results reveal a neutral surface charge for the modified materials between pH 6.0 to 6.3 ± 0.3, as compared with pH 8.7 ± 0.4 for pristine chitosan. Solvent swelling in water decreased with greater cross-linking, while the QCG materials had greater swelling over CG materials due to enhanced hydration. The adsorption results reveal variable dye uptake properties according to the cross-linker content. Similarly, surface versus micropore adsorption was demonstrated, according to the nature and ionization state of the dye for the modified adsorbents, where the CG and QCG materials had tunable sorption properties that exceeded that of unmodified chitosan. A key step in tuning the structure and surface chemical properties of cross-linked chitosan involves pH control during synthesis. The facile tunability of the physicochemical properties of the modified biopolymers reported herein means that they possess features of biomimetics that are relevant to advanced drug delivery, antimicrobial materials for wound healing, biosensors, and biosorbents for biomedical applications.

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Hybrid Chitosan Biosorbents: Tunable Adsorption at Surface and Micropore Domains

Udoetok,

Mohamed,

Wilson

2024

Biomimetics

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Chitosan-thioglycolic acid composite cross-linked with glutaraldehyde for selective recovery of Au(III) ions from e-waste leachate via reduction-coupled adsorption and incineration

Cited by 1 publication

References 61 publications

Hybrid Chitosan Biosorbents: Tunable Adsorption at Surface and Micropore Domains

Hybrid Chitosan Biosorbents: Tunable Adsorption at Surface and Micropore Domains

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