Search results for: Cezary A. Kozlowski

Items from 1 to 15 out of 15 results

article

Sorption and transport of Cs-137, Sr-90 and Co-60 radionuclides by polymer inclusion membranes

Cezary A. Kozlowski, Wladysław Walkowiak, Witalis Pellowski

Desalination > 2009 > 242 > 1-3 > 29-37

Plasticized cellulose triacetate membranes with dinonylnaphthalenesulfonic acid (DNNS) as the ion carrier containing 2-nitrophenyl pentyl ether as the plasticizer were synthesized for competitive transport and sorption of Cs-137, Sr-90, and Co-60 radioisotopes from aqueous solutions of sodium nitrate at concentration of 1.0×10 ⁻⁷ mole/dm3 each. The selectivity order of metal cations transported...

article

Macrocycle carriers for separation of metal ions in liquid membrane processes—a review

Wladyslaw Walkowiak, Cezary A. Kozlowski

Desalination > 2009 > 240 > 1-3 > 186-197

A review with more than 60 references covering macrocycle and macromolecular compounds, i.e. crown ethers, ionizable lariat ethers, calixarenes, calix crowns, as well as macrocycle polymers (for example, cyclodextrins), and macromolecular compounds, i.e. acyclic polyethers used as ion carriers in transport across liquid membranes for metal ions selective removal will be presented. The recent literature...

article

PNP-16-crown-6 derivatives as ion carriers for Zn(II), Cd(II) and Pb(II) transport across polymer inclusion membranes

Cezary A. Kozlowski, Jolanta Kozlowska

Journal of Membrane Science > 2009 > 326 > 1 > 215-221

Transport rate of metal cations can be explained by the size of substituents, namely larger substituents such as 7 and 8 prefer Pb(II) cations. The bis-PNP-lariat ethers remove Zn(II), Cd(II) and Pb(II) more efficiently than simple PNP-lariat ethers. The increase of linker length in the bis-PNP-lariat ether molecules lowers the metal cations’ transport rate. In addition, the synergetic effect for...

article

The use of membranes with cyclodextrin units in separation processes: Recent advances

Cezary A. Kozlowski, Wanda Sliwa

Carbohydrate Polymers > 2008 > 74 > 1 > 1-9

In the review, selected membranes containing cyclodextrin (CD) units are described. The paper is divided into two parts, the first one is dealing with liquid membranes, and in the second part polymer membranes are presented.

article

Modified cyclodextrin polymers as selective ion carriers for Pb(II) separation across plasticized membranes

Cezary A. Kozlowski, Wladysław Walkowiak, Tomasz Girek

Journal of Membrane Science > 2008 > 310 > 1-2 > 312-320

In the present work the hydrophobic β-cyclodextrin (β-CD) polymers have been used as macrocyclic ion carriers for separation of Pb(II), Zn(II), and Cu(II) ions from dilute aqueous solutions by transport across polymer inclusion membranes. The β-CD polymers were prepared by cross-linking of β-CD with 2-(1-docosenyl)-succinic anhydride derivatives in anhydrous N,N-dimethylformamide in the presence of...

article

Transport of Zn(II), Cd(II), and Pb(II) across CTA plasticized membranes containing organophosphorous acids as an ion carriers

Jolanta Kozlowska, Cezary A. Kozłowski, Jacek J. Koziol

Separation and Purification Technology > 2007 > 57 > 3 > 430-434

In this work a competitive transport of an equimolar mixtures of Zn(II), Cd(II), and Pb(II) across polymer inclusion membranes (PIMs) is presented. In PIMs di-2-ethylhexylphosphoric acid (D2EHPA) as well as commercial extractants, i.e. Cyanex ^® 272, 301, and 302 were used as ion carriers. The influence of nature extractants on cation transport selectivity and efficiency has been explored....

article

Kinetics of Chromium(VI) Transport from Mineral Acids across Cellulose Triacetate (CTA) Plasticized Membranes Immobilized by Tri- n -octylamine

Cezary A. Kozłowski

Industrial & Engineering Chemistry Research > 2007 > 46 > 16 > 5420 - 5428

article

Competetive transport of cobalt-60, strontium-90, and cesium-137 radioisotopes across polymer inclusion membranes with DNNS

Cezary A. Kozlowski, Wladyslaw Walkowiak

Journal of Membrane Science > 2007 > 297 > 1-2 > 181-189

Plasticized cellulose triacetate membranes with 3,7-dinonyl-naphtalene-1-sulfonic acid (DNNS) containing o-nitrophenyl pentyl ether (ONPPE) as the plasticizer were prepared for competitive transport of Cs-137, Sr-90, and Co-60 isotopes from aqueous solutions at concentration of 1.0×10 ⁻⁷ M each and containing 0.10M sodium nitrate. The receiving phase was 1.0M HCl aqueous solution. The selectivity...

article

Separation of cobalt-60, strontium-90, and cesium-137 radioisotopes by competitive transport across polymer inclusion membranes with organophosphorous acids

Cezary A. Kozlowski, Jolanta Kozlowska, Witalis Pellowski, Władysław Walkowiak

Desalination > 2006 > 198 > 1-3 > 141-148

The removal and separation of Co-60, Sr-90, and Cs-137 radioisotopes from nitrate aqueous solutions were studied by competitive transport across cellulose triacetate plasticized membranes using organophosphorous acids compounds (D2EHPA, Cyanex 272, Cyanex 301 and Cyanex 302). Competitive transport of trace radionuclides ions from 0.10 M NaNO ₃ aqueous solutions across polymer inclusion membranes...

article

Facilitated transport of metal ions through composite and polymer inclusion membranes

Cezary A. Kozlowski

Desalination > 2006 > 198 > 1-3 > 132-140

The application of activated composite membranes (ACMs) and polymer inclusion membranes (PIMs) for the transport of Pb(II), Cd(II), and Zn(II) in a continuous extraction–reextraction system using organophosphorous acids as carriers was examined. The ion carriers, DEHPA, Cyanex 301, and Cyanex 302, were incorporated into PIMs composed of cellulose triacetate as a support and o-nitrophenyl pentyl ether...

article

The effect of β-CD polymers structure on the efficiency of copper(II) ion flotation

Cezary A. Kozlowski, Tomasz Girek, WladysŁaw Walkowiak, Jolanta Kozlowska

Journal of Inclusion Phenomena and Macrocyclic Chemistry > 2006 > 55 > 1-2 > 71-77

β-Cyclodextrin (β-CD) polymers were prepared by cross-linking of β-CD with phtalic and 3-nitrophtalic anhydride in anhydrous N,N-dimethylformamide (DMF) in the presence of NaH. The weight-average molecular weight (M _W) and the chemical structure of the polymers were determined using high performance size exclusion chromatography (HPSEC) with refractive index (RI) detector, and ¹H NMR spectroscopy...

article

Applicability of liquid membranes in chromium(VI) transport with amines as ion carriers

Cezary A. Kozlowski, Wladyslaw Walkowiak

Journal of Membrane Science > 2005 > 266 > 1-2 > 143-150

Chromium(VI) transport across supported liquid membranes (SLMs) and polymer inclusion membranes (PIMs) with tertiary amines and quaternary ammonium salt (Aliquat 336) from chloride acidic aqueous solution to 0.1M NaOH has been studied. The initial flux of Cr(VI) decreases linearly with logarithm of n-octanol/water partition coefficient increase for R ₃ N amines (R=n-C ₆ H ₁₃ ...

article

Application of hydrophobic β-cyclodextrin polymer in separation of metal ions by plasticized membranes

Cezary A. Kozlowski, Tomasz Girek, Wladyslaw Walkowiak, Jacek J. Koziol

Separation and Purification Technology > 2005 > 46 > 3 > 136-144

In the present work the hydrophobic β-cyclodextrin (β-CD) polymers have been used as macrocyclic ion carriers for separation of metal ions from dilute aqueous solutions by transport across polymer inclusion membranes. The β-CD polymers, serving as ion carriers, were prepared by cross-linking β-CD with alkenyl (nonenyl and dodecenyl) succinic anhydride derivatives in anhydrous N,N-dimethylformamide...

article

Polymerisation of β-cyclodextrin with succinic anhydride. Synthesis, characterisation, and ion flotation of transition metals

Tomasz Girek, Cezary A. Kozlowski, Jacek J. Koziol, Wladysław Walkowiak, more

Carbohydrate Polymers > 2005 > 59 > 2 > 211-215

β-Cyclodextrin (β-CD) polymers were prepared by cross-linking β-CD with succinic anhydride (SA) in anhydrous N,N-dimethylformamide (DMF) in the presence of NaH. The weight-average molecular weight (M _w ) and the chemical structure of the polymers were determined using high performance size exclusion chromatography (HPSEC) with refractive index (RI) detector, and ¹ H NMR spectroscopy...

article

Removal of chromium(VI) from aqueous solutions by polymer inclusion membranes

Cezary A. Kozlowski, Wladyslaw Walkowiak

Water Research > 2002 > 36 > 19 > 4870-4876

The transport through polymer inclusion membranes (PIMs) was found as the effective and selective method of chromium(VI) anions removal from chloride acidic aqueous solutions. The optimal PIMs content was as follows: 41wt% of cellulose triacetate as the support, 23wt% of tri-n-octylamine as the ionic carrier, and 36wt% of o-nitrophenyl pentyl ether as the plasticizer. The results obtained show a linear...

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