Dataset associated with the paper "A three-stage chemical cleaning of ion-exchange membranes used in the treatment by electrodialysis of wastewaters generated in brass electroplating industries"

This dataset contains the experimental results obtained in the study of the effects of chemical cleaning on the electrochemical and structural properties of ion-exchange membranes used in long-term electrodialysis processes. The membranes (anion-exchange and cation-exchange) were previously employed in the electrodialytic treatment of a synthetic effluent from cyanide-free brass electrodeposition. After operation, the membranes were subjected to a three-stage chemical cleaning procedure using NaOH solutions at concentrations of 0.1, 0.5 and 1.0 mol·L−1. The dataset includes electrochemical data collected before cleaning, after electrodialysis, and after each cleaning step, in addition to IR spectra. Chronopotentiometry measurements were performed to evaluate changes in electrochemical behavior, including limiting current density, ohmic resistance, and overlimiting resistance.  This dataset can be reused for comparative studies on membrane cleaning strategies, fouling and degradation mechanisms in electrodialysis, and the evaluation of electrochemical diagnostics applied to ion-exchange membranes.

The data used to generate the figures are provided in the corresponding Excel worksheets. Each dataset is specified below.

Figure 3a: Current-voltage curves of the AEMs: the virgin ones, after electrodialysis, and after the 1st, 2nd and 3rd cleaning steps.

Figure 3b: Current-voltage curves of the CEMs: the virgin ones, after electrodialysis, and after the 1st, 2nd and 3rd cleaning steps.

Figure 4: Chronopotentiograms for the anion-exchange membrane after each cleaning step (1st, 2nd, 3rd).

Figure 5: Speciation diagram constructed with the composition of the working solution.

Figure 6: Chronopotentiograms for the cation-exchange membrane after each cleaning step (1st, 2nd, 3rd). 

Figure 7: IR spectra of the virgin anion-exchange membrane and after 344 h of electrodialysis + three cleaning steps.

Figure 8: IR spectra of the virgin cation-exchange membrane and after 344 h of electrodialysis + three cleaning steps.