Ion Exchange Properties of Irradiated and Chemically Modified Clinoptilolite Regarding to Cs⁺ and Sr²⁺
The ion exchange sorption of Cs⁺ and Sr²⁺ on clinoptilolite (CL) from deposit of Armenia in initial, modified by e- and g-irradiation, decationated with a hydrochloric acid, and cation-contained forms was studied. On the basis of received data the exchange capacity Е for Sr²⁺ and Cs⁺, distribution f...
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| Cite this: | Ion Exchange Properties of Irradiated and Chemically Modified Clinoptilolite Regarding to Cs⁺ and Sr²⁺ / L. Akhalbedashvili, G. Todradze, N. Kekelidze, Y. Keheyan, G. Yeritsyan, R. Gevorkyan // Хімія, фізика та технологія поверхні. — 2010. — Т. 1, № 3. — С. 281-286. — Бібліогр.: 17 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1859863929929334784 |
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| author | Akhalbedashvili, L. Todradze, G. Kekelidze, N. Keheyan, Y. Yeritsyan, G. Gevorkyan, R. |
| author_facet | Akhalbedashvili, L. Todradze, G. Kekelidze, N. Keheyan, Y. Yeritsyan, G. Gevorkyan, R. |
| citation_txt | Ion Exchange Properties of Irradiated and Chemically Modified Clinoptilolite Regarding to Cs⁺ and Sr²⁺ / L. Akhalbedashvili, G. Todradze, N. Kekelidze, Y. Keheyan, G. Yeritsyan, R. Gevorkyan // Хімія, фізика та технологія поверхні. — 2010. — Т. 1, № 3. — С. 281-286. — Бібліогр.: 17 назв. — англ. |
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| container_title | Хімія, фізика та технологія поверхні |
| description | The ion exchange sorption of Cs⁺ and Sr²⁺ on clinoptilolite (CL) from deposit of Armenia in initial, modified by e- and g-irradiation, decationated with a hydrochloric acid, and cation-contained forms was studied. On the basis of received data the exchange capacity Е for Sr²⁺ and Cs⁺, distribution factor Кd, sorption factor Кs were determined. It was shown that untreated CL(Ar), decationated CL(Ar)H and Cacontaining forms are characterized by a big ion exchange activity on strontium and cesium to compare with irradiated samples and the most perspective ion exchange sorbents for these ions are CL samples modified by a chemical way.
Вивчена іонообмінна сорбція Cs⁺ і Sr²⁺ з їхніх солей на клиноптилоліті з родовищ Вірменії у вихідній, модифікованій е- і g-опроміненням, а також у декатіоновоній і катіонній формах. Встановлено вплив типу хімічної обробки, ступеня зерніння і температури дегідратації зразків природного клиноптилоліту Вірменії, концентрації та об'єму промивних розчинів на поглинання цих іонів. За отриманими даними визначено обмінну ємність Е, коефіцієнти розподілу Кd і сорбції Кs. Показано, що необроблений CL (Ar), декатіонований і Са-вмісний вирізняються більшою іонообмінною ємністю у порівнянні з опроміненими, і найбільш перспективними сорбентами по відношенню до Sr²⁺ та Cs⁺ є хімічно модифіковані зразки.
Изучена ионообменная сорбция Cs⁺ и Sr²⁺ из их солей на клиноптилолите из месторождений Армении в исходной, модифицированной е- и g-облучением, а также в декатионированной и катионных формах. Установлено влияние типа химической обработки, степени зернения и температуры дегидратации образцов природного клиноптилолита Армении, концентрации и объема промывных растворов на поглощение этих ионов. На основании полученных данных определены обменная емкость Е, коэффициенты распределения Кd и сорбции Кs. Показано, что необработанный CL (Ar), декатионированный и Са-содержащий отличаются более высокой ионообменной емкостью по сравнению с облученными, и наиболее перспективными сорбентами по отношению к Sr²⁺ и Cs⁺ являются химически модифицированные образцы.
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Хімія, фізика та технологія поверхні. 2010. Т. 1. № 3. С. 281–286
_____________________________________________________________________________________________
* Corresponding author aklali@yahoo.com
ХФТП 2010. Т. 1. № 3 281
UDC 544.723
ION EXCHANGE PROPERTIES OF IRRADIATED
AND CHEMICALLY MODIFIED
CLINOPTILOLITE REGARDING TO Cs+ AND Sr2+
L.Akhalbedashvili1*, G. Todradze1, N. Kekelidze2, Y.Keheyan3, G.Yeritsyan4,
R. Gevorkyan5
1Tvalchrelidze Caucasian Institute of Mineral Resources, 85 Paliashvili Street, Tbilisi 0162, Georgia
2Iv. Javakhishvili Tbilisi State University, 1 Chavchavdze Ave., Tbilisi 0218, Georgia
3University of Roma "La Sapienza", 5 Aldo Moro P., Roma 00185, Italy
4Yerevan Physics Institute, 2 Alikhanyan Brothers Street, Yerevan 375036, Armenia
5Yerevan State University, 1 Alex Manoogian Street, Yerevan 0025, Armenia
The ion exchange sorption of Cs+ and Sr2+ on clinoptilolite (CL) from deposit of Armenia in initial,
modified by e- and γ-irradiation, decationated with a hydrochloric acid, and cation-contained forms was
studied. On the basis of received data the exchange capacity Е for Sr2+ and Cs+, distribution factor Кd,
sorption factor Кs were determined. It was shown that untreated CL(Ar), decationated CL(Ar)H and Ca-
containing forms are characterized by a big ion exchange activity on strontium and cesium to compare
with irradiated samples and the most perspective ion exchange sorbents for these ions are CL samples
modified by a chemical way.
INTRODUCTION
Zeolite materials (porous hydrated crystalline
alumosilicates) are gaining increasing importance in
ion exchange, molecule sieving and catalysis. Their
ion exchange capacity is one of the main parame-
ters which characterizes sorption and technological
properties of high-silicon natural zeolites. They
have the attraction of low cost in addition to high
thermal and chemical stability, good resistance to α,
β and γ radiation and high capacity and selectivity
for certain monovalent and divalent cations [1].
Zeolite-containing rocks are used in wastewater
purification to remove heavy metals [2, 3], toxic
and radioactive elements [4], especially radionu-
clides of cesium and strontium of nuclear fission
products [5]. Considerable interest in the zeolites
as cation exchange media has been generated in
the atomic energy industry. As far back as 1960
Mercer [6] studied the use of natural zeolite, cli-
noptilolite, for decontamination of condensate
wastes containing trace amounts of cesium and
strontium radioisotopes.
MATERIALS AND METHODS
The aim of the work was to study Armenian
natural zeolite clinoptilolite (ArCL), modified with
irradiation (for the first time), the thermal and
chemical ways, in ion exchange sorption of stron-
tium and cesium stable nuclides. So were studied:
• the ion exchange sorption of Cs+ and Sr2+
from aqueous solutions of their salts on ca-
tion-modified samples;
• the ion exchange sorption of Sr2+and Cs+ on
e- and γ-irradiated zeolite materials;
• the influence of concentration and volumes
of model solutions on cesium and strontium
ion exchange sorption;
• the influence of heat treatment and granula-
tion degree;
• the ion exchange sorption of Cs+ and Sr2+
from mixture of their salts on cation-
modified samples.
The exchange capacity Е for Sr2+ and Cs+, distri-
bution factor Кd, sorption factor Кs were calculated.
The clinoptilolite-type zeolite was collected
from Armenia (Nor Kokhb deposit in Noyembe-
rian region) and enriched with CL (content of CL-
phase increased from 70% up to 80–85%). It has
been characterized as typical heulandite type III
zeolite and contains minor amounts of quartz, pla-
gioclase, montmorillonite, opal-CT, calcite, and
other rock materials. Some zeolite samples were
exposed in air to doses of gamma-ray irradiation,
namely 200, 700 kGy at 293 K using a 60Co γ-shell,
and to different doses of e-irradiation, namely
L.Akhalbedashvili, G. Todradze, N. Kekelidze et al.
_____________________________________________________________________________________________
282 ХФТП 2010. Т. 1. № 3
1012–1015 e/cm2 with a ELU-8 linear electron ac-
celerator at 293 K.
The analysis of alkali and alkali-earth cations
and impurity transition metals were carried out by
atomic adsorption spectrophotometric method with
a "Perkin-Elmer" AAnalyst 800 apparatus and
capillary electrophoresis method with a CIA sys-
tem (Milford, MA, USA). The mineralogical
transformations of the acid and thermally treated
materials were monitored by X-ray diffraction
(XRD) using a DRON-2 operating with a graphite
monochromator, using CuKα-radiation.
The materials were dried at 393 K, ground in
ball mill and subsequently with pestle and mortar
so as to pass from 0.25 mm sieves and stored at
room temperature. The zeolites were subsequently
treated with 0.25% KOH or 0.5% NH4OH solu-
tions at 323 K for 90 minutes using a 1:10 solid to
liquid ratio. The suspensions were filtered and the
solids were washed until pH 7. Acid treatment was
carried out with 1N HCl at ≈368 K using the same
1:10 solid to liquid ratio. The samples were treated
twice for 40 min. After second treatment the zeo-
lites were filtered under vacuum, washed until
pH 7, dried at 333 K and ground gently with pestle
and mortar so as to pass through a 0.25 mm sieves.
Ca- and Na-forms were prepared from decation-
ated CL(Ar)H by treating with corresponding
salts. Finally thermal treatment involved heating
of the treated zeolites at 773 K for 8 hours. Chem-
ical composition of modified zeolite samples is
presented in Table 1.
Table 1. Chemical composition (mass %) of initial and
chemically treated CL
1 2 3 4 5 6
Sample
C
L
(A
r)
C
L
(A
r)
H
C
L
(A
r)
C
a
Н
C
L
(A
r)
N
a
H
C
L
(A
r)
K
C
L
(A
r)
N
H
4
SiO2 68.16 78.88 78.3 76.4 69.50 78.00
Al2O3 12.29 8.88 8.86 9.45 11.89 8.40
Fe2O3 1.48 0.12 0.10 0.27 1.90 2.40
TiO2 0.43 0.21 – – – –
SO3 0.12 0.04 – – – –
MgO 0.30 0.22 0.24 0.18 0.28 0.36
CaO 6.33 2.38 12.04 1.87 5.60 3.69
K2O 3.46 2.36 1.00 1.21 9.04 0.64
Na2O 0.76 0.06 0.30 8.16 0.72 1.09
H2O 1.14 7.11 – 3.44 – 5.23
MnO 0.23 – – – – –
Ion exchange sorption was carrying out in
flowing (in glass column) and static regimes.
RESULTS AND DISCUSSION
Policationity of CL, the presence of iron ox-
ides (1.5–4%) in their structure reduce exchange
properties with respect to cations Cs+ and Sr2+, and
so the preliminary chemical modifying is neces-
sary for extension of ion exchange ability. The
analysis on ways of modifying of zeolites with the
purpose to remove iron ions and partially to enrich
them at the expense of removal of some accompa-
nying minerals shows that optimum is the acid
treatment of zeolites with the subsequent exchange
of hydrogen on cations of alkaline and alkali-earth
metals [7, 8].
Study of ion exchange sorption of strontium
and cesium on CL(Ar) modified samples. The
research of exchange sorption of strontium and
cesium ions in static conditions was carried out on
initial CL, modified with HCl, KOH and NH4OH
solutions, calcium and sodium chlorides and for
the first time on e- and γ-irradiated samples of
Cl(Ar) (Table 2).
Table 2. The irradiated, thermal and chemical treated
samples, prepared in TSU (1–6), Y-PhyI
(7–10), RSU (11–14)
No Sample type Treatment
1 CL(Ar) initial, thermal treated at 773K
2 CL(Ar)H acid treated, thermal treated at 773K
3 CL(Ar)CaH
acid, CaCl2 treated, thermal
treated at 773K
4 CL(Ar)K
KOH treated, thermal treated
at 773K
5 CL(Ar)NH4
NH4OH treated, thermal treated
at 773K
6 CL(Ar)NaH
acid, NaCl treated, thermal treated
at 773K
7 CL(Ar) Ir12 e-irradiated with dose 1012 e/cm2
8 CL(Ar) Ir13 e-irradiated with dose 1013 e/cm2
9 CL(Ar) Ir14 e-irradiated with dose 1014 e/cm2
10 CL(Ar) Ir15 e-irradiated with dose 1015 e/cm2
11 CL(Ar)H* acid treated, γ-irradiated
with dose 200 kGy
12 CL(Ar)Ca*
acid and CaCl2 treated, γ-irradiated
with dose 200 kGy
13 CL(Ar)H* acid treated, γ-irradiated
with dose 700 kGy
14 CL(Ar)Ca*
acid and CaCl2 treated, γ-irradiated
with dose 700 kGy
Ion Exchange Properties of Irradiated and Chemically Modified
_____________________________________________________________________________________________
ХФТП 2010. Т. 1. № 3 283
The obtained values of strontium exchange
sorption for various samples, which are schemati-
cally represented in a Fig. 1, show that calcium-
containing CL differs with greatest ion exchange
activity in relation with strontium whose Е (Sr2+)
is equal 1.66 meq/g that more than twice exceeds
the found value for initial zeolite (0.618 meq/g)
and Кs is equal to 98%. The sample calcium ions
were completely exchanged with passed strontium.
The decationated form CL(Ar)H was also charac-
terized with rather large ion exchange activity
Е (Sr2 +) = 0.916 meq/g and Кs = 96%.
Samples
Fig. 1. The sorption activity of samples regarding Sr2+
A few other results are received for ion ex-
change capacity on cesium: neither e-irradiation nor
chemical modifying does not influence on ion ex-
change sorption of cesium (Fig. 2). A possible ex-
planation – the large size of ions (ionic radius of Cs+
is equal to 0.169 nm) allows them to penetrate only
into the large channels of CL. As the radius of the
dehydrated Cs+ ion is similar to that of the ditrigonal
siloxane cavity of layer silicates, adsorption of Cs to
negatively charged siloxane sites can result in inner-
sphere complexation [9]. The reactivity of the inner-
sphere complexation sites may differ widely. How-
ever, other relatively strong complexes may be
formed at other surface sites at higher concentrations.
Fig. 2.The sorption activity of samples regarding Сs+
The samples modified by a chemical way –
decationated and calcium-containing CL are most
perspective ion exchange sorbents for strontium.
The complete sorption on CL(Ar)CaH sample con-
firms the existing data [10] that strontium enters in
sorbent mainly on a place of calcium and magne-
sium (about 84% of sorbed strontium), less (15%)
on a place of sodium and almost does not replace
potassium. The sorption process for this sample is
differed by equivalence as against initial and deca-
tionated. Кs for initial sample is equal to 49% but
only 26% of the sum of calcium, magnesium, so-
dium and potassium cations are replaced by stron-
tium, rest – either simply physical adsorption or
replacement of Н+ that is less probable.
The ion exchange sorption of Sr2+and Cs+
from their solutions on e- and γγγγ-irradiated sam-
ples. Exchange capacity of strontium on the
e-irradiated samples with doses from 1012 up to
1014 е/сm2 decreases in comparison with no irradia-
ted and for a sample with a dose of an irradiation
1015 е/сm2 grows a little (Fig. 3).
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0 12 13 14 15
E
, m
eq
/g
e/sm2
Sr
Cs
10151012 1013 10140
Fig. 3.The dependence of E (Sr2+) and E (Сs+) on the
dose of e-irradiation at C0=0.1N, size of granul-
es is 0.20–0.25 mm
The exchange capacity Е (Сs+) practically
does not depend on the dose of an irradiation with
electrons and is within 0.23–0.30 meq/g. These
values are 25% lower as compared with the mag-
nitude of adsorption E (Cs+) for the raw zeolite but
confirm our assumption that the determining factor
is the size of the cation.
So, the e-irradiation reduces the sorption char-
acteristics of samples but at the same time the
weak dependence on the dose is observed. It is
possible to state that e-irradiation excites alumo-
silicon-oxygen skeleton increasing the electron
density on it and promoting the formation of per-
oxide ion O2
-. As a result of originated metastabili-
ty of equilibrium, the regrouping of cations in zeo-
lite takes place that, probably, is the reason of dif-
ficulty of access for strontium ions.
The values of E (Sr2+) and E (Сs+) for
γ-irradiated sample are also less then 0.348 and
0.158 meq/g, accordingly, than for parent sample
(0.618 and 0.38 meq/g). So, gamma rays (200 and
700 kGy) reduce the ion exchange capacity of zeo-
lite more.
The information about radiation effects in zeo-
lites, especially in natural ones, are very poor al-
though radiation modifications of these materials can
play a significant role in changing of the sorption and
other physical-chemical properties [4, 11–13]. It was
E
, m
eq
/g
L.Akhalbedashvili, G. Todradze, N. Kekelidze et al.
_____________________________________________________________________________________________
284 ХФТП 2010. Т. 1. № 3
reported that the irradiation of US-HY zeolite by
ionizing γ-rays induces contrasting effects [14,
15]. At small doses (5.50 kGy) an ordering of
structure takes place whereas at higher doses the
disordering of the crystal lattice. S.A. Dikanov et
al. supposed that this is due to the variation of the
charge states of zeolite atoms with e-irradiation
but not due to structural changes.
The influence of thermal treatment, concen-
tration, size of granules and volumes of model
solutions at ion exchange sorption of Cs+ and
Sr2+ on CL(Ar). The values of exchange capacity
and factor of sorption for Sr2+ appreciably have
been diminished with increase of treatment tem-
perature and size of granules (from 0.20 to
0.50 mm) of initial zeolite. The optimal size of
granules 0.2÷0.25 mm excluded the outer-
diffusion process. The thermal treatment above
673 K worsens its ion exchange sorption proper-
ties and than the higher is temperature of treatment
this process makes more deep is (Table 3). It is
obvious that thermal dehydration of zeolite with
loss of zeolite’s water initiates the migration of
some alkaline and alkaline-earth cations in inac-
cessible position of B and C channels of CL and
their strong fastening on the walls of channels.
These positions become inaccessible for large,
surrounded by hydrated sheath strontium ions
therefore the degree of ion exchange sorption is
lowered. The increase of initial concentration on
the order raises the value of exchange capacity at
strontium in flowing regime and does not affect
the cesium sorption. Especially it is necessary to
note that the constant interfusion of zeolite-
solution mixes has allowed obtaining the highest
values of exchange capacity, sorption and distribu-
tion factors in respect of strontium but for cesium
these parameters have remained constant.
Table 3.The influence of treatment temperature on ion ex-
change sorption of Sr2+ on CL(Ar)
T,K E, meq/g Ks, % C/C0, %
293
473
673
873
0.32625
0.2700
0.2442
0.2218
89.6
88.5
80.2
69.7
17.5
20.2
22.4
32.28
Ion exchange sorption of Sr2+ and Cs+ from
mixture of their salts. At the last stage of this
work we had prepared and examined the samples,
which showed the highest ion exchange activity:
CL(Ar)H, CL(Ar)HNa, and CL(Ar)HCa, to study
the mutual influence of Cs+ and Sr2+ ions from
their mixture of solutions on joint ion exchange
sorption. It was determined the dependence of ex-
change capacity E, factors of sorption Ks and dis-
tribution Kd on conditions of sorption.
Table 4. The dependence of E, Кs and Kd from volume of
Sr2+- and Cs+-containing solutions at C0 = 0.1 N
Exchange
ion Vsol, ml E, meq/g Ks, % Kd, ml/g
Sr2+ 50 0.733 97.50 402.5
Sr2+ 100 1.660 95.06 386.0
Sr2+ 150 1.501 93.20 417.0
Cs+ 30 0.363 76.66 162.8
Cs+ 50 0.419 88.57 385.0
Cs+ 100 0.630 66.98 208.8
At a ratio zeolite: solution equal 1:10 the value
of exchange capacity E for all samples practically
was the same with sorption coefficient of 98–100%.
The similar results were obtained and in the experi-
ences which had been carried out in dynamic condi-
tions – value E for all samples both in static and in
dynamic conditions changed in limits ~0.07 meq/g
regard to Cs+ and ~0.11–0.12 meq/g on Sr2+. The
dispersion of values of exchange capacity E rises
and grows with increase of ratio. It is possible to
conclude that at a ratio 1:10 all ions of cesium and
strontium were exchanged on cations of zeolite but
the equilibrium saturation was not reached else. The
decationated and Ca-forms of CL have shown the
least value of E concerning both ions but untreated
natural CL has appeared most active at a ratio 1:50
and 1:100 on Cs+ and in the attitude of strontium –
Ca-contained CL. I.e., the ion exchange sorption of
each of ions decreases at their simultaneous pres-
ence in a solution. The sorption of cesium reaches
an equilibrium for modified samples at a ratio 1:50,
for parent CL this level has not been reached at ra-
tio 1:100. But the sorption value for strontium
grows constantly with increase of a ratio zeolite:
solution. We compared the obtained experimental
results and those of ion exchange sorption from
individual solutions of Cs and Sr whence follows
that the values of E for sorption from these solu-
tions are much higher (Fig. 4 and 5) than those for
sorption from an intermixture of solutions of ce-
sium and strontium for all investigated samples of
CL. So, the Cs+ and Sr2+ ions influence against each
other, competing and interfering to each other in
exchange sorption. Probably, cesium ion, close by
the nature and size to potassium ion, interferes to
ion exchange sorption of strontium. The diminution
of values of exchange capacity for strontium is less
than for cesium, i.e., strontium to a lesser degree
interferes to adsorption of cesium and vice versa.
Ion Exchange Properties of Irradiated and Chemically Modified
_____________________________________________________________________________________________
ХФТП 2010. Т. 1. № 3 285
The total exchange capacity E(Sr2++Cs+) for all sam-
ples, except Ca-containing is equal to E(Sr2+) for ion
exchange sorption out of individual solution (devia-
tion 10–20%) and twice exceed E(Cs+) out of CsNO3.
0
0,2
0,4
0,6
0,8
1
1,2
1,4
1,6
1,8
CL(A
r)
CL(A
r)H
CL(A
r)H
Na
CL(A
r)H
Ca
E
, m
eq
/g
a
b
Fig. 4. The diagram of comparative values of ex-
change capacity E(Sr2+) for ion exchange sorp-
tion out of: a – individual solution of Sr(NO3)2
and b – mixture of Sr(NO3)2 and CsNO3
Fig. 5. The diagram of comparative values of ex-
change capacity E(Cs+) for ion exchange sorp-
tion out of: a – individual solution of CsNO3
and b – mixture of Sr(NO3)2 and CsNO3
CONCLUSION
The influence of temperature of preliminary
treatment of zeolites, concentration and volume of
model solutions, and degree of granulation on the
strontium exchange were investigated; it was cal-
culated the sorption capacity, sorption and distri-
bution factors. It was established that the e-irradia-
tion decreases the ion exchange capacity not only
of initial untreated CL but cation-modified too.
The same decrease of ion exchange capacity was
observed for γ-irradiated CL.
It is shown that hydrogen-, sodium- and cal-
cium-containing samples of CL(Ar) are appeared
the best in ion exchange sorption of cesium and
strontium. So, sodium-containing CL(Ar) may be
recommended for sorption of cesium nuclides
from its solution and calcium-containing CL(Ar) –
for sorption of strontium nuclide from its salts.
The ion exchange sorption of Cs+ and Sr2+
from an intermixture of solutions of their salts is
accompanied by competitive and mutually inter-
ference sorption that depresses exchange sorption
in comparison with sorption from individual solu-
tions. This distinction is especially shown for Sr2+.
Tenfold and more excess of the solution over
zeolite is insufficient for saturation and complete
replacement of cations of zeolite with Cs+ ions and
in a greater degree with Sr2+. The size of an ion
plays a determining role in ion exchange sorption.
The untreated natural CL(Ar) is more active in
the sorption from an intermixture of these metals’
salts solutions. So, parent CL from deposit of Ar-
menia may be recommended to purify nuclear
waste water from cesium and strontium nuclides.
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site for the Removal of Heavy Metals from
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Received 07.06.2010, accepted 17.08.2010
Іонообмінні властивості опроміненого та хімічно модифікованого клиноптилоліту
по відношенню до Cs+ і Sr2+
Л. Ахалбедашвілі, Г. Тодрадзе, Н. Кекелідзе, Е. Кехеян, Г. Єритцян, Р. Геворкян
Кавказький Інститут мінеральної сировини ім. А. Твалчрелідзе, вул. Паліашвілі 85, Тбілісі 0162, Грузія
Тбіліський державний університет ім. І. Джавахішвілі, вул. Чавчавадзе 1, Тбілісі 380028, Грузія
Римський університет "La Sapienza", пл. Альдо Моро 5, Рим 00185, Італія
Єреванський інститут фізики, вул. Братів Аліхонян 2, Єреван 0036, Вірменія
Єреванський державний університет, вул. Алека Манукяна 1, Єреван 0025 Вірменія
Вивчена іонообмінна сорбція Cs+ і Sr2+ з їхніх солей на клиноптилоліті з родовищ Вірменії у вихідній, мо-
дифікованій е- і γ-опроміненням, а також у декатіоновоній і катіонній формах. Встановлено вплив типу
хімічної обробки, ступеня зерніння і температури дегідратації зразків природного клиноптилоліту Вірменії,
концентрації та об'єму промивних розчинів на поглинання цих іонів. За отриманими даними визначено об-
мінну ємність Е, коефіцієнти розподілу Кd і сорбції Кs. Показано, що необроблений CL (Ar), декатіонований і
Са-вмісний вирізняються більшою іонообмінною ємністю у порівнянні з опроміненими, і найбільш перспек-
тивними сорбентами по відношенню до Sr2+ та Cs+ є хімічно модифіковані зразки.
Ионообменные свойства облученного и химически модифицированного клиноптилолита
по отношениюпо отношениюпо отношениюпо отношению к к к к Cs+ и Sr2+
Л. Ахалбедашвили, Г.Тодрадзе, Н.Кекелидзе, Е.Кехеян, Г.Еритцян, Р.Геворкян
Кавказский Институт минерального сырья им. А. Твалчрелидзе, ул. Палиашвили 85, Тбилиси 0162, Грузия
Тбилисский государственный университет им. И. Джавахишвили, ул. Чавчавадзе 1, Тбилиси 380028, Грузия
Римский университет"La Sapienza", пл. Альдо Моро 5, Рим 00185, Италия
Ереванский институт физики, ул. Братьев Алихонян 2, Ереван 0036, Армения
Ереванский государственный университет, ул. Алека Манукяна 1, Ереван 0025 Армения
Изучена ионообменная сорбция Cs+ и Sr2+ из их солей на клиноптилолите из месторождений Армении в
исходной, модифицированной е- и γ-облучением, а также в декатионированной и катионных формах. Уста-
новлено влияние типа химической обработки, степени зернения и температуры дегидратации образцов
природного клиноптилолита Армении, концентрации и объема промывных растворов на поглощение этих
ионов. На основании полученных данных определены обменная емкость Е, коэффициенты распределения Кd
и сорбции Кs. Показано, что необработанный CL (Ar), декатионированный и Са-содержащий отличаются
более высокой ионообменной емкостью по сравнению с облученными, и наиболее перспективными сорбен-
тами по отношению к Sr2+ и Cs+ являются химически модифицированные образцы.
|
| id | nasplib_isofts_kiev_ua-123456789-28993 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 2079-1704 |
| language | English |
| last_indexed | 2025-12-07T15:47:21Z |
| publishDate | 2010 |
| publisher | Інститут хімії поверхні ім. О.О. Чуйка НАН України |
| record_format | dspace |
| spelling | Akhalbedashvili, L. Todradze, G. Kekelidze, N. Keheyan, Y. Yeritsyan, G. Gevorkyan, R. 2011-11-27T17:01:16Z 2011-11-27T17:01:16Z 2010 Ion Exchange Properties of Irradiated and Chemically Modified Clinoptilolite Regarding to Cs⁺ and Sr²⁺ / L. Akhalbedashvili, G. Todradze, N. Kekelidze, Y. Keheyan, G. Yeritsyan, R. Gevorkyan // Хімія, фізика та технологія поверхні. — 2010. — Т. 1, № 3. — С. 281-286. — Бібліогр.: 17 назв. — англ. 2079-1704 https://nasplib.isofts.kiev.ua/handle/123456789/28993 544.723 The ion exchange sorption of Cs⁺ and Sr²⁺ on clinoptilolite (CL) from deposit of Armenia in initial, modified by e- and g-irradiation, decationated with a hydrochloric acid, and cation-contained forms was studied. On the basis of received data the exchange capacity Е for Sr²⁺ and Cs⁺, distribution factor Кd, sorption factor Кs were determined. It was shown that untreated CL(Ar), decationated CL(Ar)H and Cacontaining forms are characterized by a big ion exchange activity on strontium and cesium to compare with irradiated samples and the most perspective ion exchange sorbents for these ions are CL samples modified by a chemical way. Вивчена іонообмінна сорбція Cs⁺ і Sr²⁺ з їхніх солей на клиноптилоліті з родовищ Вірменії у вихідній, модифікованій е- і g-опроміненням, а також у декатіоновоній і катіонній формах. Встановлено вплив типу хімічної обробки, ступеня зерніння і температури дегідратації зразків природного клиноптилоліту Вірменії, концентрації та об'єму промивних розчинів на поглинання цих іонів. За отриманими даними визначено обмінну ємність Е, коефіцієнти розподілу Кd і сорбції Кs. Показано, що необроблений CL (Ar), декатіонований і Са-вмісний вирізняються більшою іонообмінною ємністю у порівнянні з опроміненими, і найбільш перспективними сорбентами по відношенню до Sr²⁺ та Cs⁺ є хімічно модифіковані зразки. Изучена ионообменная сорбция Cs⁺ и Sr²⁺ из их солей на клиноптилолите из месторождений Армении в исходной, модифицированной е- и g-облучением, а также в декатионированной и катионных формах. Установлено влияние типа химической обработки, степени зернения и температуры дегидратации образцов природного клиноптилолита Армении, концентрации и объема промывных растворов на поглощение этих ионов. На основании полученных данных определены обменная емкость Е, коэффициенты распределения Кd и сорбции Кs. Показано, что необработанный CL (Ar), декатионированный и Са-содержащий отличаются более высокой ионообменной емкостью по сравнению с облученными, и наиболее перспективными сорбентами по отношению к Sr²⁺ и Cs⁺ являются химически модифицированные образцы. en Інститут хімії поверхні ім. О.О. Чуйка НАН України Хімія, фізика та технологія поверхні Функціоналізовані матеріали, одержані золь-гель і темплатним методами Ion Exchange Properties of Irradiated and Chemically Modified Clinoptilolite Regarding to Cs⁺ and Sr²⁺ Іонообмінні властивості опроміненого та хімічно модифікованого клиноптилоліту по відношенню до Cs⁺ і Sr²⁺ Ионообменные свойства облученного и химически модифицированного клиноптилолита по отношению к Cs⁺ и Sr²⁺ Article published earlier |
| spellingShingle | Ion Exchange Properties of Irradiated and Chemically Modified Clinoptilolite Regarding to Cs⁺ and Sr²⁺ Akhalbedashvili, L. Todradze, G. Kekelidze, N. Keheyan, Y. Yeritsyan, G. Gevorkyan, R. Функціоналізовані матеріали, одержані золь-гель і темплатним методами |
| title | Ion Exchange Properties of Irradiated and Chemically Modified Clinoptilolite Regarding to Cs⁺ and Sr²⁺ |
| title_alt | Іонообмінні властивості опроміненого та хімічно модифікованого клиноптилоліту по відношенню до Cs⁺ і Sr²⁺ Ионообменные свойства облученного и химически модифицированного клиноптилолита по отношению к Cs⁺ и Sr²⁺ |
| title_full | Ion Exchange Properties of Irradiated and Chemically Modified Clinoptilolite Regarding to Cs⁺ and Sr²⁺ |
| title_fullStr | Ion Exchange Properties of Irradiated and Chemically Modified Clinoptilolite Regarding to Cs⁺ and Sr²⁺ |
| title_full_unstemmed | Ion Exchange Properties of Irradiated and Chemically Modified Clinoptilolite Regarding to Cs⁺ and Sr²⁺ |
| title_short | Ion Exchange Properties of Irradiated and Chemically Modified Clinoptilolite Regarding to Cs⁺ and Sr²⁺ |
| title_sort | ion exchange properties of irradiated and chemically modified clinoptilolite regarding to cs⁺ and sr²⁺ |
| topic | Функціоналізовані матеріали, одержані золь-гель і темплатним методами |
| topic_facet | Функціоналізовані матеріали, одержані золь-гель і темплатним методами |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/28993 |
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