Fixed-site carriers membranes facilitated transport

Barboiu, M., Luca, C., Popescu, G., Cot, L., Guizard, C., Hovnanian, N. and Barboiu, C. (1996) Facilitated transport of L-amino-adds II. Transport of L-phenylalanine by macrocydic fixed-site carrier membranes. Preliminary report. Roumaine Biotechnology Letters, 1 (2), 87-97. 

Barboiu M, Luca C, Popescu G, Cot L, Guizard C, Hovnanian N, Barboiu C. Facilitated transport of L-amino-acids II. Transport of L-Phenylalanine by macrocyclic fixed-site carrier membranes. Preliminary report. Roum. Biotech. Lett. 1996 1 87-97. 

Noble R. Analysis of facilitated transport with fixed site carrier membranes. J. Membr. Sci. 1990 50 207-214. 

Noble RD. Facilitated transport mechanism in fixed site carrier membranes. J Membr Sci 1991 60 297-306. 

Lacan, R, Guizard, C., Legall, R, Wettling, D., and Cot, L. 1995. Facilitated transport of ions through fixed-site carrier membranes derived from hybrid organic-inorganic materials. Journal of Membrane Science 100 99—109. 

Kusakabe K., Shibao F., Zhao G., Sotowa K.-L, Watanabe K., Saito T. Surface modification of silica membranes in a tubular type module. J. Membr. Sci. 2003 215 321-326 Lacan P., Guizard C., Le Gall P., Wettling D., Cot L. Facilitated transport of ions through fixed-site carrier membranes derived from hybrid organic-inorganic materials. J. Membr. Sci. 1995 100 99-109... 

Membranes with carrier-facilitated transport for specific gas components have also been in focus for some years, but some of these membranes studied seem to be dead-end developments. Of special interest are however those reported for CO2 capture, either as liquid membranes or as fixed-site carriers (FSC) in polymers [14,15]. 

Scheme 6 Separation mechanisms for MIP membranes, with MIP sites for a substance A (a) transport of A is facilitated via binding/desorption to MIP sites ( fixed carrier membrane) (b) transport of A is retarded either by binding or binding/desorption to MIP sites on the surface of trans-membrane pores (membrane adsorber).

Hong, J., Kang, Y. S., Jang, J., and Kim, U. Y. (1996). Analysis of facilitated transport in polymeric membrane with fixed site carrier 2. Series RC circuit model. J. Membr. Sci. 109, 159. 

We also prepared a new membrane with an amine moiety by plasma-grafting DAMA onto a microporous polyethylene substrate. The membrane obtained is suggested to act as a fixed carrier membrane for CO2 facilitated transport in dry conditions and as a fixed reaction site membrane in wet conditions. 

Kozlowski et al. [18] obtained the p CD polymers, which were prepared by crosslinking of 3-CD with 2-(l-docosenyl)-succinic anhydride derivatives in anhydrous N,N-dimethylformamide in the presence of NaH. It was established that the elongation of the hydrocarbon chain in the obtained 3-CD polymer in the reaction with 2-(l-docosenyl)-succinic anhydride results in the selectivity for Pb(ll) ions in the ion transport with the use of this ion carrier. At room temperature the dimmer was obtained, while at 100°C the polymers of 34kD and 13.5 kD fractions were received. The transport kinetics investigation on dependence of the carrier and Pb(II) concentrations have shown that the transport by the dimmer proceeded by the facilitated mechanism, typical for liquid membranes. The polymer however, has shown a linear increase of the transport flux in dependence on metal concentration in the source phase, this fact indicating that the polymer form of 3-CD prefers probably the fixed site mechanism of transport. PIMs containing dimmer and polymer of CD, in the transport of Zn(II), Cu(II) and Pb(Il) showed selectivity orders Pb(Il) Cu(II), Zn([]), and Pb(II) Cu(II) > Zn(II), respectively. The high selectivity factor for Pb(II)/Cu(II) equal to 163 for the dimmer was achieved (Table 1). 

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