Poly-cyclodextrin cryogels with aligned porous structure for removal of polycyclic aromatic hydrocarbons (PAHs) from water
Author
Topuz, F.
Uyar, Tamer
Date
2017-08Source Title
Journal of Hazardous Materials
Print ISSN
0304-3894
Publisher
Elsevier
Volume
335
Pages
108 - 116
Language
English
Type
ArticleItem Usage Stats
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Abstract
Cyclodextrins (CDs) are sugar-based cyclic oligosaccharides, which form inclusion complexes with small guest molecules through their hydrophobic cavity. Here we successfully synthesized highly porous poly-cyclodextrin (poly-CD) cryogels, which were produced under cryogenic conditions by the cross-linking of amine-functional CDs with PEG-based diepoxide cross-linker. The poly-CD cryogels showed aligned porous network structures owing to the directional freezing of the matrix, of which the pore size and architecture exposed variations depending on the composition of the reactants. The cryogels were employed for the removal of genotoxic polycyclic aromatic hydrocarbons (PAHs) from aqueous solutions. They reached PAH sorption capacities as high as 1.25 mg PAH per gram cryogel. This high sorption performance is due to interactions between PAHs and the complete swollen network, and thus, is not restricted by interfacial adsorption. Given that the hydrophilic nature of the components, the sorption performance could only be attributed to the inclusion complex formation of CDs with PAH molecules. The poly-CD cryogels could be recycled with an exposure to ethanol and reused without any significant loss in the sorption capacity of PAHs.
Keywords
CryogelCyclodextrin
PAH
Poly-cyclodextrin
Water remediation
Adsorption
Aromatic compounds
Aromatic hydrocarbons
Complex networks
Cyclodextrins
Hydrocarbons
Hydrophobicity
Molecules
Pore size
Solutions
Sorption
Aligned porous structures
Cryogels
Cyclic oligosaccharides
Directional freezing
Interfacial adsorption
Polycyclic aromatic hydrocarbons (PAHS)
Porous network structures
Water remediation
Polycyclic aromatic hydrocarbons
Anthracene
Cyclodextrin
Fluoranthene
Fluorene
Phenanthrene
Polycyclic aromatic hydrocarbon
Pyrene
Adsorption
Chemical compound
Gel
Hydrophobicity
PAH
Pollutant removal
Polysaccharide
Porous medium
Toxic substance
Water treatment
Adsorption
Aqueous solution
Article
Complex formation
Conjugation
Cross linking
Cryogel
Hydrophilicity
Molecular weight
Porosity
Reduction (chemistry)
Solubility
Structure analysis
Synthesis
Water content
Water treatment
Permalink
http://hdl.handle.net/11693/37365Published Version (Please cite this version)
https://doi.org/10.1016/j.jhazmat.2017.04.022Collections
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