NDLI: Biofilm-enhanced continuous synthesis and stabilization of palladium nanoparticles (PdNPs)

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Back cover

Environmental Science: Nano Vol - 3 Issue - 5

Environmental Science: Nano Vol - 3 Issue - 4

Environmental Science: Nano Vol - 3 Issue - 3

Environmental Science: Nano Vol - 3 Issue - 2

Environmental Science: Nano Vol - 3 Issue - 1

Environmental Science: Nano Vol -2

Environmental Science: Nano Vol -1

Biofilm-enhanced continuous synthesis and stabilization of palladium nanoparticles (PdNPs)

Content Provider	Royal Society of Chemistry (RSC)
Author	Rittmann, Bruce E. Zhou, Chen Wang, Zhaocheng Marcus, Andrew K.
Copyright Year	2016
Abstract	Biosynthesis of palladium nanoparticles (PdNPs) is considered an efficient and green method for catalytic applications. Reported short-term batch studies have demonstrated PdNP synthesis using suspended biomass, but the PdNPs tended to agglomerate to large sizes and be washed out along with the biomass under continuous operation. Biofilm is a promising alternative for continuous PdNP synthesis, as it contains significant extracellular polymeric substances (EPS) with functional groups able to adsorb/stabilize PdNPs, and the biofilm and its PdNPs are naturally retained. We tested continuous Pd nanoparticle (PdNP) synthesis using a denitrifying biofilm that promoted enzymatic and autocatalytic reduction of PdII to Pd0 on the surface of non-porous hollow-fiber membranes that delivered hydrogen gas (H2) as the electron donor. The biofilm retained >99% of PdNPs. Approximately one-half were bound as 20 to 100 nm grains on the cell surfaces, while the other half were dispersed as 3 to 4 nm Pd0 crystallites within the extracellular polymeric substance (EPS) matrix. When no biofilm was present, PdII was reduced autocatalytically to Pd0, which self-assembled to form larger aggregates in a continuous, yet fragile film on the membrane. As a result, the stabilized PdNP-biofilm catalyzed further the PdII reduction faster than the agglomerated Pd-film. These results document the beneficial roles of biofilm in enhancing PdNP production, and provide a baseline for practical long-term sustainable Pd recovery from waste streams using biofilm systems.
Starting Page	1396
Ending Page	1404
Page Count	9
File Format	HTM / HTML PDF
ISSN	20518153
Volume Number	3
Issue Number	6
Journal	Environmental Science: Nano
DOI	10.1039/c6en00308g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Biomass Flocculation Biofilm Extracellular polymeric substance Nanoparticle Autocatalysis Hydrogen Redox Extracellular matrix Catalysis
Content Type	Text
Resource Type	Article
Subject	Environmental Science Materials Science

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