4.7 Article

Encapsulation of living bacteria in electrospun cyclodextrin ultrathin fibers for bioremediation of heavy metals and reactive dye from wastewater

Journal

COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 161, Issue -, Pages 169-176

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfb.2017.10.047

Keywords

Electrospinning; Cyclodextrin; Nanofibers; Bacteria; Encapsulation; Heavy metals; Reactive dye

Funding

  1. Scientific and Technological Research Council of Turkey (TUBITAK) [114Y264]
  2. Turkish Academy of Sciences - Outstanding Young Scientists Award Program (TUBA-GEBIP)
  3. TUBITAK project [113Y348]
  4. TUBITAK BIDEB [2211-C]

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Cyclodextrins (CD) are cyclic oligosaccharides produced from the enzymatic degradation of starch as a white powder form; on the other hand, they can be transformed into ultrathin electrospun fiber form by electrospinning technique. The electrospun cyclodextrin fibers (CD-F) can be quite attractive materials to encapsulate bacteria for bioremediation purposes. For instance, CD-F not only serve as a carrier matrix but also it serves as a feeding source for the encapsulated bacteria. In the present study, we demonstrate a facile approach by encapsulation of bacteria into CD-F matrix for wastewater treatment application. The natural and non-toxic properties of CD-F render a better bacterial viability for fibrous biocomposite. The encapsulated bacteria in CD-F exhibit cell viability for more than 7 days at 4 degrees C storage condition. Furthermore, we have tested the bioremediation capability of bacteria/CD-F biocomposite for the treatment of heavy metals (Nickel(II) and Chromium(VI)) and textile dye (Reactive Black 5, RB5). The bacteria/CD-F biocomposite has shown removal efficiency of Ni(II), Cr(VI) and RB5 as 70 +/- 0.2%, 58 +/- 1.4% and 82 +/- 0.8, respectively. As anticipated, the pollutants removal capabilities of the bacteria/CD-F was higher compare to free bacteria since bacteria can use CD as an extra carbon source which promotes their growth rate. This study demonstrates that CD-F are suitable platforms for the encapsulation of bacterial cells to develop novel biocomposites that have bioremediation capabilities for wastewater treatment. (C) 2017 Elsevier B.V. All rights reserved.

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