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      Poly-cyclodextrin cryogels with aligned porous structure for removal of polycyclic aromatic hydrocarbons (PAHs) from water

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      Embargo Lift Date: 2019-08-05
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      Author
      Topuz, F.
      Uyar, Tamer
      Date
      2017-08
      Source Title
      Journal of Hazardous Materials
      Print ISSN
      0304-3894
      Publisher
      Elsevier
      Volume
      335
      Pages
      108 - 116
      Language
      English
      Type
      Article
      Item 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
      Cryogel
      Cyclodextrin
      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/11693/37365
      Published Version (Please cite this version)
      https://doi.org/10.1016/j.jhazmat.2017.04.022
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