Microbial Synthesis of Chalcogenide Nanoparticles: Combining Bioremediation and Biorecovery of Chalcogen in the Form of Chalcogenide Nanoparticles

Joyabrata Mal

May 15, 2018 by CRC Press
Reference - 222 Pages
ISBN 9781138600423 - CAT# K387881
Series: IHE Delft PhD Thesis Series

was $89.95

USD$71.96

SAVE ~$17.99

Add to Wish List
FREE Standard Shipping!

Features

  • Provides a valuable insight into the current state of the microbial synthesis of chalcogenide nanoparticles, indicating the current challenges and future perspectives of these technologies
  • Particular focus on combining bioremediation and biorecovery of chalcogen from chalcogen-containing wastewater in the form chalcogenide nanoparticles
  • Improves fundamental understanding of metal-chalcogen and metal/chalcogen-EPS interactions for developing advanced microbial synthesis of chalcogenide nanoparticles.

Summary

Recent years have seen a growing interest in the application of chalcogenide nanoparticles (NPs), e.g. Se, Te, CdSe and CdTe NPs, in various industrial sectors including energy, petroleum refining and in the field of biology and medicine. Moreover, due to the high toxicity of chalcogen oxyanions, their release into the environment is of great concern. Thus, emphasis was given in this study on the development of a novel microbial synthesis process of chalcogenide NPs by combining biological treatment of Se/Te containing wastewaters with biorecovery in the form of Se NPs, Te NPs and CdSe NPs. Enrichment of Se-oxyanion reducing microorganisms was carried out to simultaneously remove selenite (Se(IV)) and cadmium (Cd(II)) from wastewaters by combining bioremediation of toxic Se-rich wastewater with the biorecovery of Se as CdSe NPs. The results showed compositional changes in the extracellular polymeric substances (EPS) matrix of the anaerobic granular sludge upon exposure to Cd(II) and Se(IV) and identified the roles of EPS fractions in the biogenesis of CdSe NPs. Besides, it was found that the EPS on the surface of the biogenic Se NPs play a major role in lowering the bioavailability and toxicity of biogenic Se(0) compared to chemogenic Se(0) NPs. An upflow anaerobic sludge blanket (UASB) reactor was used for the first time to continuously remove tellurite from wastewater and recover biogenic Te(0).