Microbial Synthesis of Chalcogenide Nanoparticles : Combining Bioremediation and Biorecovery of Chalcogen in the Form of Chalcogenide Nanoparticles (Ihe Delft Phd Thesis Series)

Mal, Joyabrata

CRC Press（2018/05発売）

• 製本 Paperback:紙装版/ペーパーバック版／ページ数 242 p.
• 言語 ENG
• 商品コード 9781138600423
• DDC分類 628.52

Full Description

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).

Contents

1 General introduction
2 Literature review
3 Biological removal of selenate and ammonium by activated sludge in a sequencing batch reactor
4 Effect of heavy metal co-contaminants on selenite bioreduction by anaerobic granular sludge
5 Biosynthesis of CdSe nanoparticles by anaerobic granular sludge
6 Modification of extracellular polymeric substances (EPS) induced by cadmium and selenium enrichment of an anaerobic granular sludge used for synthesis of cadmium selenide nanoparticles
7 Continuous removal and recovery of tellurium in an upflow anaerobic granular sludge bed (UASB) reactor
8 A comparison of fate and toxicity of selenite, biogenically and chemically synthesized selenium nanoparticles to the Zebrafish (Danio rerio) embryogenesis
9 Discussion, conclusions and perspectives