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AZ0RBAYCAN KiMYA JURNALI № 4 2015
91
UDC543. 42. 062: 546. 77
TRANSPORTATION OF NICKEL(II) IONS WITH THE USE OF MULTICOMPONENT LIQUID MEMBRANES
E.A.Abdullaeva
Baku State University [email protected] Received 28.10.2015
The results of studies of studies on transportation of ion of nickel(II) trough multicomponent liquid membranes as a kind of tetrarodanide anion complex NH4[Ni(SCN)4] are cited. At contact of water solution of this complex with liquid membrane consisting of crown ether - 6-methyl-dibenzo-18-crown-6 (I), of aliphatic oil C33 and C2H4Cl2 is transported in a kind of anion complex (LNH4)2[Ni(SCN)4]. The influence of concentration of crown ether on kinetics of transport of ion of nickel(II) via multicompo-nent liquid membranes.
Keywords: multicomponent liquid membrane, 6-methyl-dibenzo-18-crown-6 (cw), nickel.
Introduction
The preparation of stable membranes depends upon a delicate balance between the rheo-logical properties of the oil and the stabilizing surfactant selected for formulation [1-4] suitable oil phases, which may dissolve adequate concentration. It has been prepared multicomponent liquid membrane on the base of 6-methyl-
dibenzo-18-crown-6 (cw) for transportation of
+
nickel(II) presence of SCN- ion and NH4, K+ cations.
Liquid membrane experiments were performed with systematically varied liquid membrane compositions including 6-methyl-dibenzo-l8-crown-6 ether (I) as carrier and various ratios of ethylene chloride and a C33 carbon aliphatic oil. The partitioning of macrocyclic ether samples toward fee membrane phase increased markedly with ethylene chloride addition to the aliphatic oil.
These experimental dates focus attention upon the important practical problems of noninfinite partitioning of carrier between the membrane phase and the continuous aqueous phase.
It has been developed multicomponent liquid membrane on the base of crown ether (cw) for transportation of nickel(II) in the presence of SCN- ion of macroheterocycle, may undergo excessive partitioning of the carrier and carrier complexes toward the aqueous
phase thereby markedly reducing the residual concentration of carrier in the relatively low volume "membrane" phase:
CH3
jtV i
?__?
[L]
It is better to transfer heavy metal to anion complex form II and transport it using mac-rocyclic compound I:
Ni2+ + 4SCN- ^ [Ni(SCN)4]2-.
II
It has been shown that in the presence
+
of NH4 or K+ cations crown ether is forming carrier complexes III with [Ni(SCN)4] ion which is transported across multicomponent
liquid membranes:
+
2NH4 +2L+[Ni(SCN)4]2-^(LNH4)2[Ni(SCN)4].
III
The results reported here are confined to liquid membrane experiments which define the effects of several compositional variables on the detailed properties characterizing the transport of anion complex of nickel(II) across multi-component liquid membranes.
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TRANSPORTATION NICKEL(II) ION ACROSS MULTICOMPONENT LIQUID
Experimental methods
Reagent grade NH4SCN, ethylene chloride were used as received. Other chemicals were obtained from the Merk Company. 6-methyl-dibenzo-18-crown-6 ether (cw) was obtained from laboratory "Chemical Reagents and sensors" of State Oil Academy (Baku, Azerbaijan).
Deionized water was obtained by passing tap water through water Purifier.
A 0.02 M Stock solution of NH4[Ni(SCN)4] was prepared by mixing equimolar quantities of NH4SCN and NiCl2 in aqueous solutions.
The solvent oil was kindly provided by the research institute of additives (National Academy of Sciences, Baku, Azerbaijan). The oil is specially tailored for preparation of stable liquid membrane separation systems. It is characterized as a 33 carbon atom aliphatic oil containing approximately 9% by weight aromatics. The density at 200C is 0.8705.
Nickel concentration was determined by atomies absorption spectroscopy with a Perkin Elmer 603 spectrophotometer.
[Ni(SCN)4]2- was determined by ultraviolet spectroscopy. The extinction coefficient determined by direct calibration in water containing [Ni(SCN)4]2- solutions was l.82xl04 at ^=352 nm.
In ethylene chloride was determined to be l.79xl04 by determining the absorbance at ^=366 nm of macroheterocycle-containing ethylene chloride extracts from aqueous [Ni(SCN)4] - solutions. The concentration in ethylene chloride phase was determined by difference between the initial and final aqueous phase concentrations attending the extraction.
Results and discussion
The transport of [NiSCN]2- ion from NH4[Ni(SCN)4] solutions across 6-methyl-dibenzo-18-crown-6 containing liquid membranes was studied as function of ethylene chloride and 6-methyldibenzo-18-crown-6 concentrations in the oil. The [Ni(SCN)4]2- countering was selected since it has been reported that the transport of the [Ni(SCN)4]2- containing complex was very high [1].
Within a very comprehensive set of data describing the effect of anion type on the trans-
port of various nickel complexes across crown ether containing liquid membranes an eighth order of magnitude variation in transport rate has been reported by Lamb et al. [2] for the carrier-facilitated transport of metal ion through bulk liquid membranes containing dibenzo-18-crown-6 ether.
The transport kinetics of [Ni(SCN)4]2-anion are presented in the plots of figure, which describe the effect of crown ether addition to the oil phase of liquid membrane containing 12% percent (weight) ethylene chloride in the 33 carbon atom aliphatic oil.
Time, hours
The effect of 6-methyl-dibenzo-18-crown-6 concentrations in the liquid membrane on the kinetics describing the membrane transport of NH4[Ni(SCN)4]; [C2H4Cl2]=12 wt %; ▲ [cw]=10 wt %; ■ [cw]=2 wt %.
In the absence of crown compound, virtually no [Ni(SCN)4] ion is transported. Be-
+
sides, in absence of NH4 and K+ ions also no [Ni(SCN)4] ion is transported. These results
clearly demonstrate and explain the role of a
+
carrier (crown ether I) and NH4 and K+ ions in facilitating the transfer of anion complex of nickel(II) across oil membranes. The other plots which describe the effect of crown ether addition to the oil phase reveal that although a maximum of 5% of the ammonia initially present upstream has been transported across the membrane, the ion transport is clearly unstable state, characterized by a continuously decreasing rate of transport even though the concentration transport should only drop by a maximum presence of 10 percent crown ether I should be linear
A3EPEAH#^AHCKHH XHMHHECKHH ^YPHAH № 4 2015
E.A.ABDULLAYEVA
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with a slope 5 times larger than the slope of the corresponding plot characterizing transport in the presence of 2 weight percent crown ether I. This expectation is based upon the assumption that crown ether species between the oil and aqueous phase is essentially instantaneous and invariant with time or crown concentration.
It is further implicitly assumed that partitioning of the crown ether species between the oil and aqueous phase is essentially instantaneous and invariant with time or crown concentration.
References
1. Гаджиева С.Р., Кулиева Е.Г., Абдуллаева Э.А.
Влияние природы макроциклических колец на
скорость транспорта пикрата щелочных металлов через жидкие мембраны // Akademik Hasan Oliyevin 100 illik yubileyina hasr olunmu§ "Eko-logiya: Tabiat va camiyyat problemlari" Beynalxalq elmi konfransi. Baki. 2007. P. 505-506.
2. Гаджиева С.Р., Кулиева Е.Г., Абдуллаева Э.А. Ион-транспортный способ очистки нефтей от тяжелых металлов // Kimya problemlari. 2007. № 2. P. 288-291.
3. George R. Painter and Berton C.Pressman. Dynamic aspects of ionosphere mediated membrane transport. Host Guest complex chemistry II //Academie. Verlag. Berlin. 1982. P. 83-108.
4. Morf W.E. Cation selectivity of neutral macrocy-clic and nonmacrocyclic complexing agents in membrane in Progr. Macrocyclic chem. V. 1. John Wiley and sons. New-York. 1979. P. 1.
COXKOMPONENTLÍ MAYE MEMBRANLARDAN ÍSTÍFADO ETMOKLO NÍKEL(II) ÍONLARININ
ÍONNOQLÍ ÜSULU ÍLO AYRILMASI
E.A.Abdullayeva
Qoxkomponentli maye membranlardan istifada etmakla nikel(II) ionunu tetrarodanid anion kompleksi (NH4)2[Ni(SCN)4] §aklinda naqlina aid tadqiqatlarin naticasi verilmi§dir. Bu kompleksin sulu mahlulunun 6-metildibenzo-18-kraun-6 (I) kraun efiri, C33 alifatik yag va C2H4Cl2-dan ibarat maye membranla tamasi naticasinda nikel ionu (LNH4)2[Ni(SCN)4] anion kompleksi halinda naql olunur. Kraun efirin qatiliginin nikel(II) ionlarinin goxkomponentli maye membranlarla naqli kinetikasina tasiri 6yranilmi§dir.
Agar sozlar: goxkomponentli maye membran, 6-metildibenzo-18-kraun-6, nikel.
ТРАНСПОРТ ИОНОВ НИКЕЛЯ(II) C ИСПОЛЬЗОВАНИЕМ МНОГОКОМПОНЕНТНЫХ
ЖИД КИХ МЕМБРАН
Э.А.Абдуллаева
Приведены результаты исследований по транспорту иона никеля(11) через многокомпонентные жидкие мембраны в виде тетрародинидного анионного комплекса NH4[Ni(SCN)4]. При контакте водного раствора этого комплекса с жидкой мембраной, состоящей из краун-эфира 6-метилдибензо-18-краун-6 (I), алифатического масла С33 и C2H4Cl2, ион никеля транспортируется в виде анионного комплекса (LNH4)2[Ni(SCN)4]. Изучено влияние концентрации краун-эфира на кинетику транспорта иона никеля(П) через многокомпонентные жидкие мембраны.
Ключевые слова: многокомпонентная жидкая мембрана, 6-метилдибензо-18-краун-6, никель.
