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Synthesis of Polymer Inclusion Membranes based on Cellulose Triacetate for Recovery of Lanthanum(III) from Aqueous Solutions

Makowka Adam, Pospiech Beata

Autex Research Journal

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2019

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Vol. 19, no. 3

288--292

EN

Polymer inclusion membrane (PIM) containing cellulose triacetate (CTA) as a polymer matrix and 2-nitrophenyl octyl ether (NPOE) as a plasticizer was developed. This membrane also contained di(2-ethylhexyl)phosphoric acid (D2EHPA) and tributyl phosphate (TBP) as the carriers of metal ions. The facilitated transport of lanthanum(III) from aqueous nitrate(V) solutions across PIM was studied. It was observed that metal ions were transported from the source phase into 2M H2SO4 as the receiving phase. The transport through PIM with D2EHPA as the ion carrier was found as the more effective method of lanthanum(III) removal from the aqueous solution than transport through PIM with TBP as the ion carrier.

2

Synergistic solvent extraction of Co(II) and Li(I) from aqueous chloride solutions with mixture of Cyanex 272 and TBP

Pospiech B.

Physicochemical Problems of Mineral Processing

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2016

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Vol. 52, iss. 1

353--364

EN

In this work, separation of cobalt(II) over lithium(I) ions from aqueous chloride solutions by synergistic solvent extraction (SX) has been studied. A synergistic mixture of commercial extractants such as bis(2,4,4-trimethylpentyl)phosphinic acid (Cyanex 272) and tributyl phosphate (TBP) in kerosene was used as a selective extractant. The investigations were first performed to select optimal conditions for the effective separation including pH of the aqueous phase as well as concentration of synergistic mixture. High selective solvent extraction of cobalt(II) over lithium(I) from chloride solution has been achieved by the mixture of 0.1 M Cyanex 272 and 0.05 M TBP in kerosene while efficient Co(II) stripping has been performed by 0.5 M sulphuric acid.

3

Synergistic extraction of Cr(VI) from Ni(II) and Co(II) by flat sheet supported liquid membranes using TIOA and TBP as carriers

Eyupoglu V., Surucu A., Kunduracioglu A.

Polish Journal of Chemical Technology

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2015

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Vol. 17, nr 2

34--42

EN

In present study, the synergistic separation of Cr(VI) has been investigated from synthetic acidic solution containing Cr(VI), Co(II) and Ni(II) by fl at sheet supported liquid membrane (FSSLM) technique using triisooctylamine (TIOA) and tri-n-butyl phosphate (TBP) as carriers. The main goal of the study was based in the exploring of the synergistic effect of TBP on selective extraction of Cr(VI) in presence of Co(II) and Ni(II) ions. The various parameters related with membrane and aqueous solution properties were studied to identify the optimum extraction and stripping conditions of the Cr(VI) through FSSLM. In the optimum conditions, initial mass flux (J0) and separation factors (βCr/Co and βCr/Ni) were obtained as 1.49 x 10-05 (kg/m2.s), 382.2 and 725.3 respectively from aqueous H2SO4 media through Celgard 2500 (Celgard Inc., USA) polymer support. As a result, the considerable synergistic infl uence on selective transport of Cr(VI) through FSSLM using TIOA and TBP as carriers has been identified.

4

Development of the Chalmers Grouped Actinide Extraction Process

Halleröd J., Ekberg C., Löfström-Engdahl E., Aneheim E.

Nukleonika

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2015

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Vol. 60, No. 4, part 2

829--835

EN

Several solvents for Grouped ActiNide EXtraction (GANEX) processes have been investigated at Chalmers University of Technology in recent years. Four different GANEX solvents; cyclo-GANEX (CyMe4- -BTBP, 30 vol.% tri-butyl phosphate (TBP) and cyclohexanone), DEHBA-GANEX (CyMe4-BTBP, 20 vol.% N,N-di-2(ethylhexyl) butyramide (DEHBA) and cyclohexanone), hexanol-GANEX (CyMe4-BTBP, 30 vol.% TBP and hexanol) and FS-13-GANEX (CyMe4-BTBP, 30 vol.% TBP and phenyl trifl uoromethyl sulfone (FS-13)) have been studied and the results are discussed and compared in this work. The cyclohexanone based solvents show fast and high extraction of the actinides but a somewhat poor diluent stability in contact with the acidic aqueous phase. FS-13-GANEX display high separation factors between the actinides and lanthanides and a good radiolytic and hydrolytic stability. However, the distribution ratios of the actinides are lower, compared to the cyclohexanone based solvents. The hexanol-GANEX is a cheap solvent system using a rather stable diluent but the actinide extraction is, however, comparatively low.

5

A study of cerium extraction by TBP and TODGA using a rotating diffusion cell

Bromley M. A., Boxall C.

Nukleonika

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2015

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Vol. 60, No. 4, part 2

859--864

EN

For the study of the coupled interfacial-mass transfer kinetics of, inter alia, TBP, TODGA, CyMe4-BTBP and CyMe4-BTPhen based solvent extraction processes, a new rotating diffusion cell (RDC) apparatus has been established at Lancaster University. RDC studies of Ce(IV)/TBP and Ce(III)/TODGA extraction systems have been undertaken in order to improve the understanding of the chemical and kinetic processes involved. In each case, an interesting dependency on local hydrodynamics at the solution phase boundary with results suggesting that the organic extractant molecules migrate into the aqueous phase in order to capture Ce.

6

New approach for third phase investigation in solvent extraction system

Borkowski M.

Ars Separatoria Acta

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2008

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No. 6

31-40

EN

The phenomenon of third phase formation in different liquid extraction systems is well known for more than 50 years but until now a good mathematical model that could predict the third phase formation has not been developed. The third phase is unwanted in extraction systems because, for example, in nuclear fuel reprocessing it can cause criticality problems. However, the third phase may be a useful tool in other technologies. In this paper a new approach to third phase investigation is proposed. This new approach eliminates the aqueous phase, simplifies the system and gives new insight in the nature the third phase. It is a step forward in understanding of the mechanism governing the formation of third phase. This new approach could quickly provide sufficient data to develop a comprehensive model.

7

Application of TBP in selective removal of iron(III) in solvent extraction and transport through polymer inclusion membranes processes

Pośpiech B., Walkowiak W., Woźniak M. J.

Physicochemical Problems of Mineral Processing

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2005

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Vol. 39

89-98

EN

The separation of iron(IIl) from chloride aqueous solutions containing Mn(II), Ni(II), Co(II) and Cu(ll) by solvent extraction and transport through polymer inclusion membranes (PIMs) processes was studied. Tributyl phosphate (TBP) was used as the extractant/ion carrier. Extraction of Fe(lII) increased with increasing of extractant concentration in the organic phase. The selective transport of Fe(lll) from aqueous chloride source phase through PIM containing cellulose triacatate (CTA) as the support, ο-nitrophenyl octyl ether (ONPOE) as the plasticizer and TBP as the ion carrier has been studied. The influence of the ion carrier and plasticizer concentration on the transport metal ions was investigated. The results show that Fe(III) can be separated very effectively from others metal ions. The atomic force microscopy (AFM) was used to obtain images of the pores in cellulose triacetate membranes containing a plasticizer.

PL

W pracy przedstawiono wyniki badań selektywnego wydzielania Jonów Fe(III) z wodnego roztworu chlorkowego zawierającego jony Mn(II), Ni(II), Cu(II) i Co(II) w procesie ekstrakcji cieczowej i transportu przez polimerowe membrany inkluzyjne. W roli ekstrahenta/przenośnika jonów użyto fosforanu tributylu (TBP). Zbadano zależność wydajności ekstrakcji od stężenia ekstrahenta. Wydajność ekstrakcji żelaza(III) wzrastała ze wzrostem stężenia TBP w nafcie. Najwyższy procent ekstrakcji jonów Fe(III) uzyskano przy 2,0 i 3,6 M TBP i wynosił on odpowiednio 99,5 i 99,8 %. Określono także wpływ zawartości plastyfikatora oraz przenośnika jonów w membranie na transport jonów żelaza(III) z kwaśnego roztworu chlorków Mn(II), Ni(II), Cu(II) i Co(II). W tych warunkach procesu transportu nie stwierdzono obecności jonów tych metali w fazie odbierającej. Ze wzrostem zawartości ONPOE od 0,6 do 2.0 cm3/g CTA wartość strumieni początkowych wzrastała. Przy stężeniu plastyfikatora wynoszącym 2,0 cm3/g CTA strumień początkowy wynosił 32,90 μmol/n2s. Z kolei wzrost stężenia przenośnika w membranie w zakresie od 0,5 do 1,5 M TBP (w przeliczeniu na objętość plastyfikatora) powodował wzrost wartości współczynnika przepuszczalności. Dalsze zwiększanie zawartości TBP nie wpływało na szybkość procesu. Wykorzystując mikroskopię sił atomowych (AFM) wykonano także analizę struktury powierzchni membrany zawierającej TBP, ONPOE i CTA oraz membrany z samego CTA.