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Tunable chitosan hydrogels for adsorption: Property control by biobased modifiers
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0002-5850-8873
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Polymer Technology.ORCID iD: 0000-0002-7790-8987
2018 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 196, p. 135-145Article in journal (Refereed) Published
Abstract [en]

A sustainable strategy to fabricate chitosan-based composite hydrogels with tunable properties and controllable adsorption capacity of trace pharmaceuticals was demonstrated. Two biobased modifiers were utilized to tune the properties, nano-graphene oxide (nGO) derived from chitosan via microwave-assisted carbonization and oxidation, and genipin as the crosslinking agent. An increase in genipin content facilitated an increase in the degree of crosslinking as shown by improved storage modulus and decreased swelling ratio. Increasing nGO content changed the surface microtopography of the hydrogel which correlated with the surface wettability. nGO also catalyzed the genipin-crosslinking reaction. The hydrogel was further shown to be an effective adsorbent for a common anti-inflammatory drug, diclofenac sodium (DCF), with the removal efficiency ranging from 91 to 100% after 48 h. DCF adsorption efficiency could be tuned through simple alteration of nGO and genipin concentration, which provides promising potential for this environmental-friendly adsorbent in removal of DCF from pharmaceutical waste water.

Place, publisher, year, edition, pages
Elsevier Ltd , 2018. Vol. 196, p. 135-145
Keywords [en]
Adsorbent, Biobased, Chitosan, Graphene oxide, Hydrogel, Pharmaceutical
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-228696DOI: 10.1016/j.carbpol.2018.05.029ISI: 000436571600016Scopus ID: 2-s2.0-85047074150OAI: oai:DiVA.org:kth-228696DiVA, id: diva2:1210998
Note

QC 20180530

Available from: 2018-05-30 Created: 2018-05-30 Last updated: 2019-04-10Bibliographically approved
In thesis
1. From Polysaccharides to Functional Materials for Trace Pharmaceutical Adsorption
Open this publication in new window or tab >>From Polysaccharides to Functional Materials for Trace Pharmaceutical Adsorption
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The transition to bioeconomy will reduce our dependency on fossil fuels as well as contribute to a more sustainable society. Within this framework, exploitation and development of renewable substitutes to petroleum-based products provides feasible roadmap for the material design. Here a perspective is provided to how the natural polysaccharides chitosan (CS) and/or cellulose (CL) could be elaborated and transformed to high-performance materials with the explicit aim of removing trace pharmaceutical contaminants from the wastewater, thus facilitating the sustainable development. In the first part of the thesis, chitosan and cellulose were converted to the carbon spheres (C-sphere) through a microwave-assisted hydrothermal carbonization process, and C-sphere was further broken down to the nanographene oxide (nGO) via a simple oxidation route. On this foundation, a green pathway was developed for fabrication of biobased materials for wastewater purification. First, macroporous chitosan-based composite hydrogels with controllable properties were developed, where chitosan-derived nGO worked as a functional property enhancer. Second, a further development changing from the bulky hydrogels to microgels consisting of CS composite particles in the microscopic size was achieved by a fast one-pot spraying-drying process. The crosslinking reaction occurred in situ during the spray-drying. Last, the C-sphere by-itself was also believed to be a potential adsorbent for wastewater contaminants. In the next step the prepared systems were evaluated for their capacity to adsorb pharmaceutical contaminants. Diclofenac sodium (DCF) was utilized as the model drug, and the three fabricated bio-adsorbents all demonstrated effective DCF adsorption performance, with the adsorption efficiency varying from 65.6 to 100%. Moreover, the DCF adsorption kinetics, isotherms and thermodynamic study were also investigated to reveal the nature of the adsorption process with the different materials. Finally, chitosan-based microspheres were selected for the reusability study, with the adsorption efficiency above 70% retained after six adsorption-desorption cycles, thus further endowing the promising potential of the fabricated bio-adsorbents for commercial applications.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2019. p. 48
Series
TRITA-CBH-FOU ; 2019:21
Keywords
Chitosan, cellulose, nanographene oxide, carbon spheres, hydrogel, microsphere, adsorbent, pharmaceutical, microwave, spray-drying
National Category
Environmental Engineering Nano Technology Textile, Rubber and Polymeric Materials Physical Chemistry Polymer Chemistry
Research subject
Fibre and Polymer Science
Identifiers
urn:nbn:se:kth:diva-248454 (URN)978-91-7873-167-1 (ISBN)
Public defence
2019-05-23, F3, Lindstedtsvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20190411

Available from: 2019-04-11 Created: 2019-04-09 Last updated: 2019-05-27Bibliographically approved

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Feng, ZhaoxuanOdelius, KarinHakkarainen, Minna

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