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Scalable economic extracellular synthesis of CdS nanostructured particles by a non-pathogenic thermophile

Scalable economic extracellular synthesis of CdS nanostructured particles by a non-pathogenic... We report microbially facilitated synthesis of cadmium sulfide (CdS) nanostructured particles (NP) using anaerobic, metal-reducing Thermoanaerobacter sp. The extracellular CdS crystallites were <10 nm in size with yields of ~3 g/L of growth medium/month with demonstrated reproducibility and scalability up to 24 L. During synthesis, Thermoanaerobacter cultures reduced thiosulfate and sulfite salts to H2S, which reacted with Cd2+ cations to produce thermodynamically favored NP in a single step at 65 °C with catalytic nucleation on the cell surfaces. Photoluminescence (PL) analysis of dry CdS NP revealed an exciton-dominated PL peak at 440 nm, having a narrow full width at half maximum of 10 nm. A PL spectrum of CdS NP produced by dissimilatory sulfur reducing bacteria was dominated by features associated with radiative exciton relaxation at the surface. High reproducibility of CdS NP PL features important for scale-up conditions was confirmed from test tubes to 24 L batches at a small fraction of the manufacturing cost associated with conventional inorganic NP production processes. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Industrial Microbiology Biotechnology Springer Journals

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References (45)

Publisher
Springer Journals
Copyright
Copyright © 2013 by Society for Industrial Microbiology and Biotechnology (Outside the USA)
Subject
Life Sciences; Microbiology; Biochemistry, general; Inorganic Chemistry; Genetic Engineering; Biotechnology; Bioinformatics
ISSN
1367-5435
eISSN
1476-5535
DOI
10.1007/s10295-013-1321-3
pmid
24005990
Publisher site
See Article on Publisher Site

Abstract

We report microbially facilitated synthesis of cadmium sulfide (CdS) nanostructured particles (NP) using anaerobic, metal-reducing Thermoanaerobacter sp. The extracellular CdS crystallites were <10 nm in size with yields of ~3 g/L of growth medium/month with demonstrated reproducibility and scalability up to 24 L. During synthesis, Thermoanaerobacter cultures reduced thiosulfate and sulfite salts to H2S, which reacted with Cd2+ cations to produce thermodynamically favored NP in a single step at 65 °C with catalytic nucleation on the cell surfaces. Photoluminescence (PL) analysis of dry CdS NP revealed an exciton-dominated PL peak at 440 nm, having a narrow full width at half maximum of 10 nm. A PL spectrum of CdS NP produced by dissimilatory sulfur reducing bacteria was dominated by features associated with radiative exciton relaxation at the surface. High reproducibility of CdS NP PL features important for scale-up conditions was confirmed from test tubes to 24 L batches at a small fraction of the manufacturing cost associated with conventional inorganic NP production processes.

Journal

Journal of Industrial Microbiology BiotechnologySpringer Journals

Published: Sep 5, 2013

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