Selective and Efficient Removal of Volatile Organic Compounds by Channel-type Gamma-Cyclodextrin. Assembly through Inclusion Complexation

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Celebioglu A., İPEK S., DURGUN E., UYAR T.

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, vol.56, no.25, pp.7345-7354, 2017 (Peer-Reviewed Journal) identifier

  • Publication Type: Article / Article
  • Volume: 56 Issue: 25
  • Publication Date: 2017
  • Doi Number: 10.1021/acs.iecr.7b01084
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.7345-7354


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 gamma-CD where CD molecules are stacked on top of each other to form long cylindrical channels. The gamma-CD "channel-type" crystals have shown very effective removal of organic volatile compounds (VOCs;: aniline and toluene) from the surroundings, whereas cage-type gamma-CD could not entrap VOCs froth the same environment. Encapsulation capability of channel-type gamma-CD is at a,2:1 and molar ratio for aniline/CD and toluene/CD, respectively. Thus, channel-type gamma-CD crystals have shown higher removal efficiency for aniline compared to toluene. Channel-type gamma-CD is also able to remove aniline selectively from surroundings. Additionally, computational modeling studies suggested that single gamma-CD cavity Can hest two, molecules of aniline or toluene for the complexation, yet, aniline is more insistent to make a complex with the gamma-CD cavity when compared to toluene. We show that channekype gamma-CID 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" gamma-CD crystals could be a competitive alternative to activated carbon as an adsorbent for the VOC removal/filtering.