Biocatalytic dechlorination of lindane by nano-scale particles of Pd(0) deposited on Shewanella oneidensis

A new approach for the removal of the pesticide lindane (γ-hexachlorocyclohexane or γ-HCH) makes use of catalytic reduction of HCH to benzene over a metal catalyst, namely Pd(0). Since specific surface area plays an important role in reactivity of catalysts, this study investigated the use of bioPd(...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2007, Vol.66 (1), p.99-105
Main Authors: Mertens, Birgit, Blothe, Christian, Windey, Kim, De Windt, Wim, Verstraete, Willy
Format: Article
Language:English
Subjects:
Applied sciences
Biocatalysis
biocatalysts
Biodegradation, Environmental
Biological and physicochemical phenomena
Biomass
BioPd
Bioreactors - microbiology
biotransformation
Catalysis
catalysts
Chlorine - chemistry
Chlorine - metabolism
dechlorination
Exact sciences and technology
insecticide residues
lindane
Lindane - chemistry
Lindane - metabolism
Membrane reactor
Molecular Structure
Nanostructures - chemistry
Natural water pollution
Palladium
Palladium - chemistry
Palladium - metabolism
Pollution
Reductive dechlorination
Shewanella - growth & development
Shewanella - metabolism
Shewanella oneidensis
wastewater treatment
Water treatment and pollution
γ-hexachlorocyclohexane
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Summary:A new approach for the removal of the pesticide lindane (γ-hexachlorocyclohexane or γ-HCH) makes use of catalytic reduction of HCH to benzene over a metal catalyst, namely Pd(0). Since specific surface area plays an important role in reactivity of catalysts, this study investigated the use of bioPd(0), i.e. nano-scale Pd(0) particles precipitated on the biomass of Shewanella oneidensis, for the removal of lindane. It was demonstrated that bioPd(0) has catalytic activity towards dechlorination of γ-HCH, with the addition of formate as electron donor, and that dechlorination with bioPd(0) was more efficient than with commercial powdered Pd(0). The biodegradable compound benzene was formed as reaction product and other HCH isomers could also be dechlorinated. Subsequently bioPd(0) was implemented in a membrane reactor technology for the treatment of γ-HCH polluted water. In a fed-batch process configuration with formate as electron donor, a removal percentage of 98% of γ-HCH saturated water (10 mg l −1) was achieved within 24 h. The measured chloride mass balance approached the theoretical value. The results of this work showed that a complete, efficient and fast removal of lindane was achieved by biocatalysis with bioPd(0).
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2006.05.018