According to literature, Aluminum(Al) electrodes followed charge neutralization mechanism in removal of anionic dyes due to its positively charged surfaces. If number of sulfonate and hydroxyl substitutions increases the dye removal efficiency increases.
Can anyone explain why Al electrodes preferred charge neutralization than sweep coagulation mechanism?
Dear Sakthi
As I know this behaviour of aluminium electrode is due to the high affinity of aluminium species to adsorb cationic particles (pollutants), which results, at the end, in charge neutralization.
We can say that when the DC current is applied, the charges on the surface of the targeted pollutants will neutralised upon contact with the oppositely charged deposition electrode.
However, I think we will not reach this point easily as the anode produces more of fresh coagulants as long as the DC current is applied.
The following book could be a useful reference
Ceramics and Composites Processing Methods, 2012, by Bansal and Boccaccini
Regards
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