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@ARTICLE{Arcon:275821,
author = {Arcon, Iztok and Paganelli, Stefano and Piccolo, Oreste and
Gallo, Michele and Vogel-Mikuš, Katarina and Baldi, Franco},
title = {{XAS} analysis of iron and palladium bonded to a
polysaccharide produced anaerobically by a strain of
{K}lebsiella oxytoca},
journal = {Journal of synchrotron radiation},
volume = {22},
number = {5},
issn = {1600-5775},
address = {Chester},
publisher = {IUCr},
reportid = {PUBDB-2015-04252},
pages = {1215 - 1226},
year = {2015},
abstract = {Klebsiella oxytoca BAS-10 ferments citrate to acetic acid
and CO2, and secretesa specific exopolysaccharide (EPS),
which is able to bind different metallicspecies. These
biomaterials may be used for different biotechnological
purposes,including applications as innovative green
biogenerated catalysts. In productionof biogenerated Pd
species, the Fe(III) as ferric citrate is added to
anaerobicculture of K. oxytoca BAS-10, in the presence of
palladium species, to increasethe EPS secretion and improve
Pd-EPS yield. In this process, bi-metallic (FePd-EPS)
biomaterials were produced for the first time. The
morphology of bimetallicEPS, and the chemical state of the
two metals in the FePd-EPS, areinvestigated by transmission
electron microscopy, Fourier transform
infra-redspectroscopy, micro-X-ray fluorescence, and X-ray
absorption spectroscopymethods (XANES and EXAFS), and
compared with mono-metallic Pd-EPS andFe-EPS complexes. Iron
in FePd-EPS is in the mineralized form of iron
oxides/hydroxides, predominantly in the form of Fe3+, with a
small amount of Fe2+ inthe structure, most probably a
mixture of different nano-crystalline iron oxidesand
hydroxides, as in mono-metallic Fe-EPS. Palladium is found
as Pd(0) in theform of metallic nanoparticles with
face-centred cubic structure in both bimetallic(FePd-EPS)
and mono-metallic (Pd-EPS) species. In bi-metallic
species,Pd and Fe nanoparticles agglomerate in larger
clusters, but they remain spatiallyseparated. The catalytic
ability of bi-metallic species (FePd-EPS) in a
hydrodechlorinationreaction is improved in comparison with
mono-metallic Pd-EPS.},
cin = {DOOR},
ddc = {540},
cid = {I:(DE-H253)HAS-User-20120731},
pnm = {899 - ohne Topic (POF3-899) / FS-Proposal: I-20110511 EC
(I-20110511-EC) / CALIPSO - Coordinated Access to
Lightsources to Promote Standards and Optimization (312284)},
pid = {G:(DE-HGF)POF3-899 / G:(DE-H253)I-20110511-EC /
G:(EU-Grant)312284},
experiment = {EXP:(DE-H253)D-C-20150101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000360142400011},
pubmed = {pmid:26289273},
doi = {10.1107/S1600577515010371},
url = {https://bib-pubdb1.desy.de/record/275821},
}