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Wyświetlanie 1-6 z 6
Tytuł:
On the kinetics of Zn(II) and Cd(II) ions flotation with proton ionizable lariat ethers
Autorzy:
Ulewicz, M.
Walkowiak, W.
Powiązania:
https://bibliotekanauki.pl/articles/347072.pdf
Data publikacji:
2004
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Źródło:
Ars Separatoria Acta; 2004, 3; 89-97
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selective removal of Cu(II), Co(II), Zn(II), and Ni(II) with ionizable dibenzo-16-crown-5 and dibenzo-19-crown-6 lariat ethers as ion carriers in polymer inclusion membrane transport
Autorzy:
Kozłowski, C. A.
Walkowiak, W.
Powiązania:
https://bibliotekanauki.pl/articles/346931.pdf
Data publikacji:
2007
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
polymer inclusion membrane
competitive transport
copper(II)
cobalt(II)
zinc(II)
nickel(II)
enthalpy of formation
Derivatives of dibenzo-16-crown-5 and dibenzo-19-crown-6
Opis:
A selective removal of transition metal cations, i.e. Cu(II), Co(II), Zn(II), and Ni(II), with ionizable dibenzo-16-crown-5 and dibenzo-19-crown-6 lariat ethers as ionic carriers in transport across polymer inclusion membrane has been presented. The competitive transport from aqueous nitrate solutions containing metal ions at concentrations of 0.0010 M at pH 4.0 and 7.0 through the cellulose triacetate membrane with 0.5 M lariat ether 1 and 2 (based on a plasticizer) as the ion carrier and o-nitrophenyl pentyl ether (ONPPE) as the plasticizer into 0.5 M hydrochloric solution was performed. For pH = 4.0 and 7.0 of source aqueous phases the selectivity orders were as follows: Cu(II) > Co(II) > Zn(II) > Ni(II), and Cu(II) > Zn(II), Ni(II), Co(II), respectively. The semi-empirical equation was used for calculations of enthalpy formation for complexes of lariat ethers studied with transition metal cations. The two possibilities of metal cation-lariat ether coordination were assumed, i.e. via the crown ether cavity or ionizable carboxylic group. We found that for the both lariat ethers studied at pH 4.0 of source phase the transport rate linearly decreases with the enthalpy of formation increase. This correlation confirms that the observed behavior is connected with the stability of complexes formed by interaction of the lariat ether ring and the transition metal cations studied.
Źródło:
Ars Separatoria Acta; 2007, 5; 19-26
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Principles and applications of solvent sublation - a review
Autorzy:
Sobianowska, K.
Walkowiak, W.
Kozłowski, C.
Powiązania:
https://bibliotekanauki.pl/articles/346991.pdf
Data publikacji:
2010
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
solvent sublation
ion flotation
adsorptive bubble separations
metal ions
organic compounds
Opis:
This article reviews more than 50 references covering the solvent sublation as one of the adsorptive bubble separation methods for organic and inorganic coumpounds removal from aqueous solutions, which were published last 50 years. The solvent sublation is very simple, effective and fast process for removal and separation of chemical compounds from dilute aqueous solutions and can be treated as preconcentration method in their analytical determination. This review concerns the fundamentals of solvent sublation process and desribes the factors determinating the process (temperature, composition of initial aqueous solution, pH, ionic strength, surfactants and ligands presence, organic solvent presence with additives and gas bubble generation). The examples of metal ions selective removal (Table 1) and organic coupounds removal (Table 2) are shown.
Źródło:
Ars Separatoria Acta; 2009-2010, 7; 23-38
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zinc(II) selective removal from other transition metal ions by solvent extraction and transport through polymer inclusion membranes with D2EHPA
Autorzy:
Ulewicz, M.
Walkowiak, W.
Pośpiech, B.
Powiązania:
https://bibliotekanauki.pl/articles/346997.pdf
Data publikacji:
2003
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
polymer inclusion membrane
solvent extraction
zinc(II)
cobalt(II)
nickel(II)
copper(II)
cadmium(II)
Opis:
An experimental investigation concerns zinc(II), cobalt(II), nickel(II), copper(II) and cadmium(II) ions separation from aqueous chloride solutions by solvent extraction and transport through polymer inclusion membrane (PIM) processes. The selective transport of metal ions from the aqueous chloride source phase through PIM containing cellulose triacetate (support), o-nitrophenyl pentyl ether (plasticizer) and di(2-ethylhexyl)phosphoric acid (ion carrier) is shown. Zn(II) can be effectively removed from dilute aqueous chloride solutions by its transport through PIMs with di(2-ethylhexyl)phosphoric acid as the ionic carriers into 1.0 M HCl as the receiving phase. The transport selectivity of Zn(II) over Co(II), Ni(II), Cu(II) and Cd(II) decreases while the pH of the solution increases in the source phase. Also, by solvent extraction, Zn(II) can be selectively removed from dilute aqueous chloride solutions.
Źródło:
Ars Separatoria Acta; 2003, 2; 47-55
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of D2EHPA for manganese(II) and nickel(II) separation by solvent extraction and polymer inclusion membranes
Autorzy:
Pośpiech, B.
Walkowiak, W.
Ulewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/347057.pdf
Data publikacji:
2004
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
manganese(II)
nickel(II)
D2EHPA
solvent extraction
polymer inclusion membrane
Opis:
The separation of manganese(II) and nickel(II) from chloride solution with di-(2-ethylhexyl) phosphoric acid (D2EHPA) was studied. The metal ions were separated using solvent extraction and transport through polymer inclusion membranes (PIMs) with D2EHPA as the extractant/ion carrier. The aqueous solutions consisted of 0.010 M manganese(II) and nickel(II) chlorides. The influence of aqueous phase pH on the separation of Mn(II) and Ni(II) has been investigated. Mn(II) can be selectively removed from chloride solution at equilibrium pH equal to 2.90. From the organic phase, Mn(II) was stripped with 0.1-2.0 M aqueous solutions of HCl, H2SO4 and HNO3. The competitive transport of Mn(II) and Ni(II) through PIMs was studied as a function of the ion carrier and plasticizer concentration in the membrane.
Źródło:
Ars Separatoria Acta; 2004, 3; 72-80
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of macrocycle compounds for metal ions separation and removal - a review
Autorzy:
Walkowiak, W.
Ulewicz, M.
Kozłowski, C. A.
Powiązania:
https://bibliotekanauki.pl/articles/346971.pdf
Data publikacji:
2002
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
macrocycles
crown ethers
lariat ethers
metal ions
separation
Opis:
A review is presented on macrocyclic compounds novel reagents for metal ions separation and removal in solvent extraction, transport through liquid membranes, and flotation processes. As macrocyclic compounds were used such chemicals as non-ionizable crown ethers, ionizable crown ethers (lariat ethers), calixarenes, and acyclic polyethers. Many literature data as well our own recent research data will be reported on metal ions removal and separation.
Źródło:
Ars Separatoria Acta; 2002, 1; 87-98
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

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