XIV
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International Conference on Molecular Spectroscopy, Białka Tatrzańska 2017
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International Conference on Molecular Spectroscopy, Białka Tatrzańska 2017
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Spectroscopic studies of U(VI) sorption products on inuline
Agnieszka Gładysz-Płaska
1
, Agnieszka Lipke
1
, Dariusz Sternik
1
,
Marek Majdan
1
, and Mariusz Trytek
2
1
Faculty of Chemistry, Maria Curie-Sklodowska University, M. Curie-Sklodowska Sq. 2, 20-031
Lublin, Poland, e-mail: agnieszka.lipke@poczta.umcs.lublin.pl, agnieszka.gladysz.plaska@onet.pl
2
Faculty of Biology and Biotechnology, Maria Curie-Sklodowska University, Akademicka 19, 20-033
Lublin, Poland
Removal of metals and organic compounds occurring in industrial sewages, as well as long-
lived radioisotopes from radioactive solutions, nuclear power plants, or their leaching from the
earth's crust in the mining industry is very important from the point of view of health hazards
and environmental issues. Among all purification processes, adsorption is of the greatest interest
due to its design and operation flexibility as well as high efficiency. Recently the attention has
been paid to adsorption on the natural materials, so-called biosorbents: yeasts, algae, bacteria,
plants of all kinds or vegetable wastes [1].
The aim of the study was to investigate the sorption properties of natural sorbent based on
the inulin. Inulin is a polysaccharide composed of 30–35 molecules of monosaccharides (Fig. 1)
and it is known as a compound having many applications in dietetics, medicine, food
technology. This material has been obtained from the roots of the plant Dahlia which were dried
and ground. Dahlia roots (tubers) were chosen as the source of inulin, since they contain about
45–55% of this polysaccharide. Several spectroscopic methods were used in the studies: SEM,
XPS, FTIR, luminescence and thermal analysis for identification of sorption products and
proposed sorption mechanisms. The sorption capacity of this sorbent was 50 mg/g for the
system containing only uranium and 95 mg/g for the system containing uranium at a
concentration from 0.05 to 1 mmol/dm
3
and phosphate at a concentration of 0.05 mmol/dm
3
simultaneously.
200
400
600
800
1000
1200
0
20000
40000
60000
80000
100000
120000
140000
Binding energy, eV
C
P
S
O
2
s
A
l 2
p
Si
2
p
+
U
5
d
C
1
s
U
4
f
N
1
s
O
1
s
Fig. 1. Structure of inulin. Fig. 2. XPS spectra of U(VI) sorbed on the inuline.
Keywords: uranium; biosorbent; FTIR; XPS
Acknowledgment
The research was carried out with the equipment purchased thanks to the financial support of the European
Regional Development Fund in the framework of the Operational Program Development of Eastern Poland
2007-2013 (Contract No. POPW 01.03.00-06-017/09).
References
[1] Ch. Zhao, X. Li, C. Ding, J. Liao, L. Du, J. Yang, Y. Yang, D. Zhang, J. Tang, N. Liu, Q. Sun, J.
Radioanal. Nucl. Chem. 310 (2016) 165.
XIV
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International Conference on Molecular Spectroscopy, Białka Tatrzańska 2017
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Physical chemistry of sodium silicate interactions during consolidation:
effect of CO
2
on gel structure
Renata Cicha-Szot
1
, Maja Mroczkowska-Szerszeń
2
, and Sławomir Falkowicz
1
1
Department of Petroleum Engineering, Oil and Gas Institute – National Research Institute, Lubicz
25A, Kraków, Poland, e-mail: mroczkowska@inig.pl
2
Department of Geology and Geochemistry, Oil and Gas Institute – National Research Institute,
Lubicz 25A, Kraków, Poland
Protection of ground water resources is a key challenge in 21
st
century. Developing of new
technologies is crucial in order prevent pollution not only close to urban settings with highly
congested infrastructure but also in the case of demanding topographical relief. Trenchless methods
are attractive solutions however for the optimum trenchless technology the combinations of the
variety of factors by the choice of the parameters should be considered [1]. These are: the materials
and the geotechnical aspects.
One of the advantage of the developed trenchless Technology of Forming Horizontal insulating
Barriers (TFHB) in water bearing zones is injection of non-toxic, environmentally friendly water
solution of sodium silicate. As an gelling agent carbon dioxide is applied. The purpose of this work is
better understanding of injection fluid properties by identifying the effect of carbocatalysis (external
catalysis) on consolidation mechanism of sodium silicate solutions during vertical permeability
reduction.
Infrared spectroscopy using Attenuated Total Reflectance (ATR) technique, confirms structural
change of sodium silicate during the contact with CO
2
as well as evaluation of sol-gel transition in the
presence of CO
2
and internal catalytic agent (HCl). The process may be described by changes in
share of different types of bounds present in the solution and gelled samples, like presence of Q
2
, Q
3
and Q
4
type tetrahedra in different proportions, where Q represents fourfold coordinated silicon atom
and its index shows how many other silicon atoms are interconnected by the oxygens. Increasing
amount of species with high coordination index may be an evidence of the structure crosslinking
process [2, 3].
The main indicators of sol-gel transition are spectral changes, like increase in intensity of bands
which should be most probably assigned to Si–O–Si antisymmetric stretching vibrations of Q
3
and Q
4
species corresponding to their higher participation percentage in total share [2], comparing to initial
silicate sol structure where mainly Q
2
species are present in the starting solution. The first stage of the
gelling progress manifests itself also in the shifting of the dominating Si-O bands, towards higher
wavenumbers (ca. 1080 cm
–1
), depending of gelling solution composition. The prosses coincidences
with changing of the positon of the maximum assigned to Q
2
species, towards higher wavenumbers
from 1006 to 1015 cm
–1
, which also may be correlated with the pH decrease [4]. The study was
performed for basic and Al modified silicate solutions. Obtained results show clearly the difference
between chemical structure of internally and externally catalyzed silicate gelling systems.
Keywords: alkaline silicate solution; carbocatalysis; horizontal insulating barriers, gelation
Acknowledgment
This work is the result of research conducted within the research project „Novel environmentally friendly
technique of creating horizontal barriers in water bearing zones” funded by the National Centre for
Research and Development within Smart Growth Operational Programme Priority axis 1: SUPPORT FOR
R&D ACTIVITY OF ENTERPRISES Priority 1.1.1: R&D projects of enterprises, Contract No.:
POIR.01.01.01-00-1038/15-00
References
[1] A. Kuliczkowski, A. Zwierzchowska, Structure and Environment 2(2) (2010) 31.
[2] M. Tognonvi, J. Soro, J-L. Gelet, S. Rossignol, J. Non-Cryst. Solids 358 (2012) 81.
[3] S.A. MacDonald, C.R. Schardt, D.J. Masiello, J.H. Simmons, J. Non-Cryst. Solids 275 (2000) 72.
[4] M. Tognonvi, J. Soro, J-L. Gelet, S. Rossignol, J. Non-Cryst. Solids 358 (2012) 492.
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