Biosynthesis of CdSe nanoparticles by anaerobic granular sludge
作者： Joyabrata Mal Joyabrata Mal , YV Nancharaiah , Santanu Bera Santanu Bera , Neeraj Maheshwari Neeraj Maheshwari , ED van Hullebusch
DOI: 10.1039/C6EN00623J
关键词:
摘要: This study investigated the feasibility of combining bioremediation selenium (Se) containing wastewater and biorecovery Se as cadmium selenide nanoparticles (CdSe NPs). A microbial community anaerobic granular sludge was enriched for 300 days in presence Cd(II) selenite (Se(IV)). Complete Se(IV) (79 mg L−1) reduction Cd (30 observed after 16th transfer (8 months) with formation both elemental (Se(0)) dissolved (Se(−II)). either associated Se(0) or remained aqueous phase free ions and/or CdSe. The absorption fluorescence spectra showed CdSe NPs. UV-vis X-ray photoelectron spectroscopy (XPS) confirmed that NPs were capped by extracellular polymeric substances (EPS) originating from sludge. Raman XPS analysis further phase, while present pellet centrifugation mainly precipitated a Se(0)–Cd complex. CdSe/CdS core/shell structure found sludge, suggesting on surface core interact sulfhydryl (–SH) groups EPS UASB granules.
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