Ion-exchange membrane

Kinetics of surface water desalination by neutralization dialysis (ND) was studied in a three-compartment stack with ion-exchange membranes, and the process feasibility was evaluated. The pH and the ionic conductivity of a model saline solution (0.02 M NaCl) were measured during different ND operati

The structural, selective and electrokinetic characteristics and percolation parameters were determined for different ion-exchange polymer membranes from their conductivity data using the two-phase model of membrane conductivity and percolation theory. The two different combinations of micro-phases

Transport of basic amino acids during the electrodialysis is studied and the procedures of their recovery from various mixtures are suggested. Peculiarities of basic amino acids transfer through the ion-exchange membranes are closely connected with their amphoteric nature and high values of isoelect

Poly(1,4-phenylene sulfide) was sulfonated with fuming sulfuric acid to different degrees. The products were ground and sieved (mesh size 50 µm) to obtain small particles. The particles and linear polyethylene were mixed in various ratios and the resulting blends were press-molded at 150EC to obtain

Based on the Nernst–Planck equations of ion flow, a simple model was proposed for the current–voltage characteristics of an ion-exchange membrane under limiting current density. The numerical analysis depicts the influence of parameters such as solution concentration, diffusion boundary layer thickn

As the preparation of interpolyme- type anion-exchange membranes involves several steps and the use of hazardous chemicals such as chloromethyl ether and trimethyl amine, it was envisaged to prepare heterogeneous anion-exchange membranes through a simple technique involving casting of a solution con

The feasibility of the removal of Ag+ ions in a model solution and a sample of rinse water provided from an industrial plating plant was investigated in a batch electrodialysis system. The experiments were carried out using two different types of ion-exchange membranes. The effects of applied potent

The simultaneous recovery of trivalent and tetravalent chromium ions through charged ion-exchange membranes by using three detachable cells was tested at different current densities. The effect of mono- and divalent valence ions corresponding to trivalent and hexavalent chromium ions in the feed pha

Chloride-nitrate equilibrium was studied using the Neosepta ACS anion-exchange membrane. Ion-exchange isotherm and selectivity coefficient were performed on the basis of the Donnan equilibrium and Helfferich’s equilibrium relationship. Fixed ionic group concentration and water activity coefficients

We have used electrodialysis for the separation of amino acids, mineral ions and sugars. It is an important problem at the last stages of biotechnological production of amino acids. We consider two effects that allow one to solve the problem of separations. The “barrier” effect makes it possible to