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


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Keskin N. O. S. , Celebioglu A., Sarioglu O. F. , UYAR T., Tekinay T.

COLLOIDS AND SURFACES B-BIOINTERFACES, vol.161, pp.169-176, 2018 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 161
  • Publication Date: 2018
  • Doi Number: 10.1016/j.colsurfb.2017.10.047
  • Journal Name: COLLOIDS AND SURFACES B-BIOINTERFACES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.169-176
  • Keywords: Electrospinning, Cyclodextrin, Nanofibers, Bacteria, Encapsulation, Heavy metals, Reactive dye, INCLUSION COMPLEX, POLYMERIC NANOFIBERS, MICROPARTICLES, SPECTROSCOPY, FABRICATION, REMOVAL, RELEASE, BETA
  • Gazi University Affiliated: Yes

Abstract

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.