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      Selective and efficient removal of volatile organic compounds by channel-type gamma-cyclodextrin assembly through inclusion complexation

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      Author
      Celebioglu A.
      Ipek, S.
      Durgun, Engin
      Uyar, Tamer
      Date
      2017
      Source Title
      Industrial and Engineering Chemistry Research
      Print ISSN
      0888-5885
      Publisher
      American Chemical Society
      Volume
      56
      Issue
      25
      Pages
      7345 - 7354
      Language
      English
      Type
      Article
      Item Usage Stats
      137
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      139
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      Abstract
      Cyclodextrins (CD), produced from enzymatic degradation of starch, are a form of biorenewable cyclic oligosaccharide which has an outstanding capability to form inclusion complexes with a variety of molecules including pollutants due to their toroid-shaped molecular structure. In this study, by a simple reprecipitation method, we obtained "channel-type" packing from γ-CD where CD molecules are stacked on top of each other to form long cylindrical channels. The γ-CD "channel-type" crystals have shown very effective removal of organic volatile compounds (VOCs; aniline and toluene) from the surroundings, whereas cage-type γ-CD could not entrap VOCs from the same environment. Encapsulation capability of channel-type γ-CD is at a ∼2:1 and ∼1:1 molar ratio for aniline/CD and toluene/CD, respectively. Thus, channel-type γ-CD crystals have shown higher removal efficiency for aniline compared to toluene. Channel-type γ-CD is also able to remove aniline selectively from surroundings. Additionally, computational modeling studies suggested that single γ-CD cavity can host two molecules of aniline or toluene for the complexation, yet, aniline is more insistent to make a complex with the γ-CD cavity when compared to toluene. We show that channel-type γ-CD can remove VOCs molecules (aniline and toluene) as efficiently as activated carbon. Hence, being a starch-based biorenewable cyclic oligosaccharide in the form of white powder, the use of "channel-type" γ-CD crystals could be a competitive alternative to activated carbon as an adsorbent for the VOC removal/filtering.
      Keywords
      Activated carbon
      Cyclodextrins
      Molecules
      Oligosaccharides
      Starch
      Toluene
      Volatile organic compounds
      Computational model
      Cyclic oligosaccharides
      Cylindrical channel
      Effective removals
      Enzymatic Degradation
      Inclusion complexation
      Removal efficiencies
      Reprecipitation methods
      Aniline
      Permalink
      http://hdl.handle.net/11693/37303
      Published Version (Please cite this version)
      https://doi.org/10.1021/acs.iecr.7b01084
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