Preparation And Characterization Of Reticular DSA For MFEDI

Membrane-free electrodeionization (MFEDI) is a new process for high purity water production, which needs only electricity to regenerate exhausted resins without chemicals or membranes. In this paper, a type of fine reticular dimensionally stable anode (DSA), Ti/RuO2-IrO2-TiO2, was investigated for MFEDI. The study includs three parts:the optimization of electrodes preparation parameters, the characterization of electrodes performance, and the stability test of electrode application.It was shown that the thermal decomposition could successfully prepared the fine reticular Ti/RuO2-IrO2-TiO2 electrodes. The optimal electrodes preparation parameters were:a substrate of Titanium stretch mesh, etching with oxalic acid, Ru:Ir:Ti (molar ratio) of 30:10:60, a calcination temperature of 450 ℃. The physicochemical and electrochemical tests showed that the reticular Ti/RuO2-IrO2-TiO2 coating prepared with optimal conditions was compact, with few cracks detected, and existed as a solid solution. The accelerated life of the electrodes was about 713h, and it was predicted to work stability for a long time at a low current density.The electrodes were applied to MFEDI automation device. In 20 operational cycles, the equipment performed well, and the electrodes demonstated high stability. The results reveal that the reticular Ti/RuO2-IrO2-TiO2 electrodes prepared in this paper could use successfully for MFEDI, and provides a strong support for its industrial application in the long run.