[Preparation of NiAl-MMO Films Electrode and Its Capacitive Deionization Property]

Hydrotalcites are not only considered as important absorbents in water treatment and but also widely used as super capacitor materials. In this study, NiAl metal oxide (NiAl-MMO) films, which were the calcined products of hydrotalcite-like compounds, were grown on the surface of a foam nickel by an in-situ growth method using a foam nickel substrate as the nickel source. The prepared NiAl-MMO films electrodes materials had stable electrochemical capability, remarkable electrochemical capacitor, and gave a highest specific capacitance of 667 F x g(-1). The desalination performance of material indicated high voltage and weakly alkaline solution were favored for desalination. A highest desalination efficiency was up to 58.17% when the initial concentration of Cl- was 0.003 mol x L(-1), the voltage value was 1.0 V and pH value was 8. The adsorption saturated electrodes could be rapidly regenerated with a desorption rate of 87.96% by electrodes reversion. This study provides a new choice for desalination in wastewater treatment.