Radiative stability and sorption ability of clinoptilolite nanoparticles
The ion exchange of clinoptilolite nanoparticles by means of a radioactive isotope ¹³²Cs was studied. The caesium capacity for clinoptilolite nanoparticles at size 90 nanometers at reaching of an equilibrium was 55 mg/g. Приведено результати по сорбції цезію наночастинками клиноптилоліту. Вивчено іо...
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| Опубліковано в: : | Вопросы атомной науки и техники |
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| Дата: | 2015 |
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2015
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| Цитувати: | Radiative stability and sorption ability of clinoptilolite nanoparticles / N. P. Dikiy, A. N. Dovbnya, Yu. V. Lyashko, D. V.Medvedev, E. P.Medvedeva, I. D. Fedorets // Вопросы атомной науки и техники. — 2015. — № 3. — С. 76-78. — Бібліогр.: 12 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1860218973414490112 |
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| author | Dikiy, N.P. Dovbnya, A.N. Lyashko, Yu.V. Medvedev, D.V. Medvedeva, E.P. Fedorets, I.D. |
| author_facet | Dikiy, N.P. Dovbnya, A.N. Lyashko, Yu.V. Medvedev, D.V. Medvedeva, E.P. Fedorets, I.D. |
| citation_txt | Radiative stability and sorption ability of clinoptilolite nanoparticles / N. P. Dikiy, A. N. Dovbnya, Yu. V. Lyashko, D. V.Medvedev, E. P.Medvedeva, I. D. Fedorets // Вопросы атомной науки и техники. — 2015. — № 3. — С. 76-78. — Бібліогр.: 12 назв. — англ. |
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| container_title | Вопросы атомной науки и техники |
| description | The ion exchange of clinoptilolite nanoparticles by means of a radioactive isotope ¹³²Cs was studied. The caesium capacity for clinoptilolite nanoparticles at size 90 nanometers at reaching of an equilibrium was 55 mg/g.
Приведено результати по сорбції цезію наночастинками клиноптилоліту. Вивчено іонний обмін у наноклиноптилоліті за допомогою радіоактивного ізотопу ¹³²Cs. Ємність по цезію для наночастинок клиноптилоліту розміром близько 90 нм при досягненні рівноваги склала 55 мг/г.
Приведены результаты по сорбции цезия наночастицами клиноптилолита. Изучен ионный обмен в наноклиноптилолите при помощи радиоактивного изотопа ¹³²Cs. Емкость по цезию для наночастиц клиноптилолита размером около 90 нм при достижении равновесия составила 55 мг/г.
|
| first_indexed | 2025-12-07T18:17:42Z |
| format | Article |
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RADIATIVE STABILITY AND SORPTION ABILITY OF
CLINOPTILOLITE NANOPARTICLES
N.P.Dikiy1∗, A.N.Dovbnya1, Yu.V.Lyashko1, D.V.Medvedev1,
E.P.Medvedeva1, I.D.Fedorets2
1National Science Center ”Kharkov Institute of Physics and Technology”, 61108, Kharkov, Ukraine;
2V.N. Karazin Kharkov National University, 61077, Kharkov, Ukraine
(Received March 25, 2015)
The ion exchange of clinoptilolite nanoparticles by means of a radioactive isotope 132Cs was studied. The caesium
capacity for clinoptilolite nanoparticles at size 90 nanometers at reaching of an equilibrium was 55 mg/g.
PACS: 66.30.-h; 81.05.Rm
1. INTRODUCTION
The problem of practical use of natural minerals
as the selective sorbents of various radioisotopes is
explored throughout many years. Various objects of
environment (bedrock, water, vegetative objects etc.)
intensively absorb radioisotopes. It is known [1] that
natural getter materials on the basis of zeolites pos-
sess high selectivity to some radioisotopes. The ze-
olites belong to high-silicon aluminosilicate and pos-
sess by high thermo- and chemical stability.
Getter properties of zeolites are being character-
ized by high cation-exchange capacity, an advanced
surface, selectivity in relation to ions of strontium,
caesium and radon [2]. The porous structure of zeo-
lites allows to carry out a directional modification of
water-cationic complexes, owing to their weak cou-
pling with a crystalline skeleton. For example, alu-
minosilicate with bidimensional structure is less selec-
tive to radionuclide’s of caesium and strontium. The
caesium distribution coefficient change in the range
from 103-104 ml/g, strontium - from 340 to 500 ml/g
depending on concentration of background.
It is necessary to notice that in many cases
(atomic engineering, ecology, etc.) politest (clinop-
tilolite) is suitable for application only in fine-
dispersed a state with the dimensions of particles
from several unities to tens and hundred nanome-
ters. For example, [3] in a new sorption-membranous
technology the process of neutralisation of a liquid
radioactive waste is possible only at use nano powder
of clinoptilolite.
Variety of practical application of nanoclinoptilo-
lite are caused by its structural singularities. One
of the most remarkable of these singularities is crys-
talline skeleton with hollows and channels. In natural
clinoptilolite they are filled up by crystalline hydrated
water. The three-dimensional crystal of nanoclinop-
tilolite has a substratified constitution and bidimen-
sional system of channels. The ions of Al3+ and Si4+
in elemental cell [(Si,Al)O4] are in tetrahedral coordi-
nations relatively of oxygen and isomorphically sub-
stitutes Si4+. The perceptible hydration of clinop-
tilolite leads to weakening of electrostatic interaction
of cations with a skeleton and, accordingly, to drop-
ping of barriers of their migration [4]. The correct
select of preliminary handling of a mineral is major
factor of rising of cation activation [5,6]. For exam-
ple, rise of temperature leads to development of diffu-
sion mobility of molecules of water and cations. The
barrier of diffusion of molecules of water in clinop-
tilolite is equal to 30∓2 and 25∓1 a kj/Mol, and is
being characterized by great values of preexponential
factors -(4∓2)·1011. Apparently the process of molec-
ular diffusion and of cation diffusion is caused ther-
moactivation ones of same equilibrium defects. The
defect formation is connected with H-bond reorgani-
sation at temperature growth. The crystal-hydrated
water is being released easily at slow warming. De-
hydration process is accompanied by destruction of
aquacomplex which freely move in skeleton vacuities.
The liberated cations migrate to various crystallo-
graphic places of a lattice and connect with oxygen
atoms of aluminosilicate tetrahedrons. The location
of atoms near to planes of a crystalline lattice vary
according to new locating of cations and formation of
new connections with skeleton oxygen.
The cations of Na+, K+, Ca2+, etc., are be-
ing substituted by cations of other metals (Cs+ and
Sr2+). Sorption of Cs+ and Sr2+ is caused by correla-
tion between the dimension of vacuities and the ionic
radii of Cs+ - 0.69, and of Sr2+ - 0.13 nanometers.
The large ionic radius of Cs+ cation is more preferable
for structure of clinoptilolite As a result selectivity of
clinoptilolite to Cs+ is more than to strontium.
∗Corresponding author E-mail address: ndikiy@kipt.kharkov.ua
76 ISSN 1562-6016. PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY, 2015, N3(97).
Series: Nuclear Physics Investigations (64), p.76-78.
The mutual relation between cations of clinop-
tilolite take place on a surface and on interphasic
boundaries and appreciably depends on the dimen-
sion of particles of the mineral, properties of sur-
face and interphasic boundaries [7]. The functional
bond between structure and properties is specific for
nanostructure systems. For the most part it con-
cerns properties of exterior and interior diffusion pro-
cesses. The diffusion coefficient for exterior pro-
cesses is 10−5 cm2/s, and for interior processes –
10−11 cm2/s. According to this data the rate of ion
exchange and the adsorption capacity of nanostruc-
ture clinoptilolite can be increased by means of aug-
mentation of their specific surface area. The surface
of nanoparticles have high density that gives the pos-
sibility to raise considerably capacity of volume unit
[8,9].
In spite of the fact that the problem of getter abil-
ity of nanoparticles is widely researched, representa-
tions about influence on activity of cations of their
dimension, densities, radioimmunity and quantity of
an absorbed dose of ionising radiation from the ra-
dionuclide disposed in them till now remain obscure.
2. MATERIALS AND METHODS
The high-silicon natural zeolite (clinoptilolite) out
of the Sokirnitsky deposit with high content of SiO2
(<70%) and Si/Al≥5 and by cationic capacity up
to 2 mgeq./g was researched. This mineral is hy-
drated aluminosilicate with open wireframe struc-
ture (NaK)4CaAl6Si30O72·24H2O). The dimension
of original fine-grained powder of clinoptilolite was
∼3 mm. Procedure of deriving clinoptilolite in nano-
size state was the following: the grinding of clinop-
tilolite in agate mortar for a long time, the precipi-
tation of powder in the distilled water with the sub-
sequent centrifugation. The velocity of subsidence of
clinoptilolite particles was being determined out of
equation:
V =
2g(ρ− ρo)r
2
9η
, (1)
where ρ, ρo - density of clinoptilolite particles and
water, accordingly, g - acceleration of free falling, r -
particle radius, η - dynamic viscosity of water. Af-
ter 6 days of precipitation the solution was decanted
and centrifuged. Velocity of turnovers of centrifuge
was 12 thousands/s. In this case the sedimentation
at a centrifugation was accomplished for diameter of
clinoptilolite particles from 70 to 110 nanometers.
The spectrum of natural clinoptilolite (195 g)
is shown on Fig.1. The gamma lines above than
background and lines corresponding 40K and families
of 238U, 235U, 232Th observed on Fig.1. The con-
tent of the following elements with using of intensity
gamma spectrum were determined: U – 2.75·10−6,
Th – 1.06·10−5 and K – 2.49·10−2 g/g. These data
are similar to the initial data of clinoptilolite sam-
ple from Sokirnitsky deposit: Th - 12 µg/g and
K2O – 2.96%, ie 1.2·10−5 and 2.45·10−2 g/g, respec-
tively. These results indicate that the content of U
and Th approximately coincide with the prevalence
of these elements in the Earth’s crust (Th 1.0·10−5
and U 3.6·10−6 g/g) and their ratio in the speci-
men (3.87) is slightly higher than the average in the
Earth’s crust (2.78).
400 800 1200 1600
101
102
103
214Bi 1120 keV
214Pb 352 keV
co
un
ts
energy, keV
40K 1461 keV
511 keV
214Bi
1764 keV228Ac 911,969 keV
208Tl 583 keV
214Bi 609 keV
212Pb 238 keV
Fig.1. The gamma spectrum on natural
clinoptilolite
The age of the mineral is more 700·103 years (for
T1/2=75.4·103 years for 230Th) in case to take into
consideration equilibrium isotope activity of a family
of 238U. Content of K in the sample coincides with
its index in passport.
3. RESULTS AND DISCUSSION
CsNO3 sample (30mg) was irradiated by
bremsstrahlung with Emax=23 MeV, I=700µA.
The nuclear reaction for activating cesium was
133Cs(γ,n)132Cs. The active sample of CsNO3 was
dissolved in 250 ml of distilled water.
The sample of nanoclinoptilolite (3.7mg) was
placed in a solution of 132CsNO3. The time of
sorption was 24 hours. The caesium content in
nanoclinoptilolite after 24 hours of a sorption was
55 mg/g (Fig.2). In our case according to [10] the
time of stabilisation of equilibrium at level 0.95 for
nanoparticles of clinoptilolite (100 nm)was 8 hours.
400 800 1200
101
102
103
132Cs 630 keV
40K 1461 keV
132Cs 464 keV
co
un
ts
energy, keV
132Cs
nanoclinoptilolite
132Cs 668 keV
Fig.2. The gamma spectrum of nanoclinoptilolite
sample after sorption from solution of CsNO3
77
It is known that the lattice parameter of nanopar-
ticles depends on their size [10]. The critical size of
nanoparticles can be calculated in the following way:
Lo =
√
1.5
km
h(θD)−1/2 = 230(θD)−1/2, (2)
where – an Avogadro number, a Dirac constant, elec-
tron mass, accordingly. In the most cases the De-
bye temperature of nanoparticles is less, than for the
same massive materials.
According to [11] the modification of lattice pa-
rameter of oxides can be observed up to 100 nanome-
ters. The hydrated radius of caesium is less than the
hydrated radii of sodium and potassium. Therefore
exchange of ions of Na and K of Cs in nanoparticles
will be more intense in comparison with exchange in
massive material. Abovementioned the properties of
nanoparticles promote of higher capacity of caesium
in nanoclinoptilolite.
4. CONCLUSIONS
1. Nanoparticles of clinoptilolite are chemically
stable and have selectivity towards isotope of the cae-
sium obtained in reaction 133Cs(γ,n)132Cs.
2. The sorption ability of clinoptilolite nanopar-
ticles towards of radiocaesium was studied. Equilib-
rium was reached after about 2 hours of sorption.
3. The ion exchange capacity of clinop-
tilolite nanoparticles (∼90 nm) towards of
132Cs was 55 mgeq./g after reaching equilibrium.
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78
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| id | nasplib_isofts_kiev_ua-123456789-112105 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 1562-6016 |
| language | English |
| last_indexed | 2025-12-07T18:17:42Z |
| publishDate | 2015 |
| publisher | Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| record_format | dspace |
| spelling | Dikiy, N.P. Dovbnya, A.N. Lyashko, Yu.V. Medvedev, D.V. Medvedeva, E.P. Fedorets, I.D. 2017-01-17T16:15:16Z 2017-01-17T16:15:16Z 2015 Radiative stability and sorption ability of clinoptilolite nanoparticles / N. P. Dikiy, A. N. Dovbnya, Yu. V. Lyashko, D. V.Medvedev, E. P.Medvedeva, I. D. Fedorets // Вопросы атомной науки и техники. — 2015. — № 3. — С. 76-78. — Бібліогр.: 12 назв. — англ. 1562-6016 PACS: 66.30.-h; 81.05.Rm https://nasplib.isofts.kiev.ua/handle/123456789/112105 The ion exchange of clinoptilolite nanoparticles by means of a radioactive isotope ¹³²Cs was studied. The caesium capacity for clinoptilolite nanoparticles at size 90 nanometers at reaching of an equilibrium was 55 mg/g. Приведено результати по сорбції цезію наночастинками клиноптилоліту. Вивчено іонний обмін у наноклиноптилоліті за допомогою радіоактивного ізотопу ¹³²Cs. Ємність по цезію для наночастинок клиноптилоліту розміром близько 90 нм при досягненні рівноваги склала 55 мг/г. Приведены результаты по сорбции цезия наночастицами клиноптилолита. Изучен ионный обмен в наноклиноптилолите при помощи радиоактивного изотопа ¹³²Cs. Емкость по цезию для наночастиц клиноптилолита размером около 90 нм при достижении равновесия составила 55 мг/г. en Національний науковий центр «Харківський фізико-технічний інститут» НАН України Вопросы атомной науки и техники Ядерно-физические методы и обработка данных Radiative stability and sorption ability of clinoptilolite nanoparticles Радiацiйна стiйкiсть i сорбцiйна можливiсть наночастинок клиноптилолiту Радиационная стойкость и сорбционная способность наночастиц клиноптилолита Article published earlier |
| spellingShingle | Radiative stability and sorption ability of clinoptilolite nanoparticles Dikiy, N.P. Dovbnya, A.N. Lyashko, Yu.V. Medvedev, D.V. Medvedeva, E.P. Fedorets, I.D. Ядерно-физические методы и обработка данных |
| title | Radiative stability and sorption ability of clinoptilolite nanoparticles |
| title_alt | Радiацiйна стiйкiсть i сорбцiйна можливiсть наночастинок клиноптилолiту Радиационная стойкость и сорбционная способность наночастиц клиноптилолита |
| title_full | Radiative stability and sorption ability of clinoptilolite nanoparticles |
| title_fullStr | Radiative stability and sorption ability of clinoptilolite nanoparticles |
| title_full_unstemmed | Radiative stability and sorption ability of clinoptilolite nanoparticles |
| title_short | Radiative stability and sorption ability of clinoptilolite nanoparticles |
| title_sort | radiative stability and sorption ability of clinoptilolite nanoparticles |
| topic | Ядерно-физические методы и обработка данных |
| topic_facet | Ядерно-физические методы и обработка данных |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/112105 |
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