ELECTRO-DEIONIZATION OF Cr (VI)-CONTAINING SOLUTION. PART I: CHROMIUM TRANSPORT THROUGH GRANULATED INORGANIC ION-EXCHANGER

San copolymer membranes with ion exchangers for Cu(II) removal from synthetic wastewater by electrodialysis

“…As can be seen from Table 2, rd values for copper ions increase from 64.69% to 70.31% with the values (6 and 8 V) of the current or voltage used in the electrochemical setup (Rodrigues et al, 2008;Caprarescu et al, 2012;Dzyazko, 2006;Spoor et al, 2002;Dzyazko et al, 2008). It was demonstrated that a high copper ion concentration (1 g/L Cu 2 + ) can be removed in 90 min of the electrodialysis operation performed under two constant applied voltages at the room temperature.…”

“…This method has already been applied for the removal of Cu 2+ , Ni 2+ and Cr 6+ ions from the dilute solutions (Dzyazko, 2006;Dzyazko et al, 2008;Spoor et al, 2002;Mahmoud et al, 2007;Feng et al, 2007). But in these cases the process is complicated by the deposition of insoluble compounds on the ion exchange membrane.…”

Heterogeneous Membranes Modified with Nanoparticles of Inorganic Ion-Exchangers for Whey Demineralization

“…Pairs of pristine or composite membranes were used. Geometrical parameters of the cell were similar to those listed in [20]. Whey (1.5 dm 3 ) circulated through the desalination compartment with a flow velocity of 5 cm 3 s -1 (first line).…”

“…The equipment is listed in [20]. The reference electrodes were supplied with Luggin capillaries, which defined a clear sensing point for the reference electrode near the two sides of the membrane.…”

Preparation of Anion-Exchange Cellulose for the Removal of Chromate

“…The World Health Organization has recommended that the maximum allowable concentration of Cr(VI) in drinking water be 0.05mg/L [2,[7][8][9]. In order to reduce the Cr(VI) concentration to permissible level; adsorption, ion exchange, membrane processes, and polymeric sorbents were used [5,[10][11][12][13][14]. It should be noted that such methods can be ineffective or too expensive to treat wastes having metal ions in concentrations of 100 mg/L or below.…”