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Apart from their stability in various operating conditions, the two main properties of ion-exchange membranes (IEMs) are the conductivity and selectivity, but both are difficult to obtain simultaneously at high values. This presentation deals with different ways of measurements, including specifi ...
Desalination 147 (2002)

... of bulky substituted groups and arylene ether groups into the polymer backbone. Membranes with oxygen permeability of 3.8 barrers and O2/N2 selectivity of 4.6 were obtained by using the polyamide with 2,5 di-tert-butylbenzene group in the polymer backbone. It was also found that the relationshi ...
Desalination 144 (2002)

... idea: the difference of the counterions mobilities in their respective membranes explains the pH changes. Keywords: Electrodialysis; pH changes; Selectivity; CF and 504: comparison; Mobilities; Non-electroneutrality 1. Introduction T he electrodialysis is applied to recover n ickel salts from rinsin ...
Desalination 132 (2000)

... to guide the users to find a suitable membrane. Keywords: Nanofiltration; Low pressure reverse osmosis; Characterizations; SKK mass transfer; Selectivity; Brackish water; Drinking water defluorination *Corresponding author. Presented at the conference on Desalination and the Environment. Sponsore ...
Desalination 221 (2008)

In this study, experiments were carried out to estimate sorptivity of chitosan beads and their selectivity towards Cu2+ (copper sulfate), Zn2+ (zinc sulfate) and Cr6+ (potassium dichromate) ions. Studies were performed in the concentration range fro ...
Desalination 218 (2008)

... properties of ion exchangers containing Cu(II) ions were studied. The most conductive exchangers were chosen. The adsorption data showed a high selectivity of the zirconium phosphate towards copper ions in a concentration range from 0 to 0.5 mmol. Both exchangers were tested in ion-exchange-assiste ...
Desalination 162 (2004)

... are known for their uniform pore size and are therefore suitable as membrane materials for the separation of different kind of molecules. The selectivity of these zeolite membranes is determined by the size of these molecules and by the diffusion and adsorption processes. These processes ar ...
Desalination 224 (2008)

The diffusion of the corresponding complexes with Fe(III) in supported liquid membrane (SLM) system has been evaluated. It was found that the selectivity improves as the 4-acyl groups become bulkier. This improvement could be attributed to the narrowed distance between the two donating oxygens ( ...
Desalination 148 (2002)

... data allowed to validate the quality of the model structures. A significant improvement to former results could be assessed for the predicted selectivity values. Desalination 144 (2002) 67–72 Molecular modelling of polyimide membranes for gas separation Matthias Heuchel*a, Dieter Hofmannb a GKSS
Desalination 144 (2002)

... % SO2. In addition, the selectivities of CO2 and the SO2 mixture have been obtained. Keywords: Supported ionic liquid membranes; Permeability; Selectivity; Sulfur dioxide and carbon dioxide recovery. 1. Introduction Sulfur dioxide (SO2) and carbon dioxide (CO2) emissions have to be controlled an ...
Desalination 246 (2009)

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