Capacitive Deionization Process Via Nano-Titanium Carburizing Electrode

Capacitive deionization (CDI) technology is an economical and effective electrosorption desalination method. In Capacitive deionization process, the feed solution flows through high adsorption capacity electrodes in which the anions and cations from the salty water are adsorbed on the charged electrodes. Two methods of chemical deposition and high vacuum magnetron sputtering are used for the preparation of nano-titanium carburizing electrode (named C1-TiO₂and C2-TiO₂). This paper apply the prepared nano-titanium carburizing electrode to the construction of a CDI desalination reactor. This paper focuses the desalination of capacitive deionization (CDI), investigates the influence of electrode material on adsorption capacity. By comparing the adsorption capacity of different kinds of electrode material, combined with physical and chemical characteristic and electrochemical analysis, the paper choose the optimal electrode material for capacitive deionization. The results show that under the same conditions, the adsorption capacity of nano-titanium carburizing electrode named C2-TiO₂ up to 9.61mg/g.

In the capacitive deionization process by the selected nano-titanium carburizing electrode, the most optimal processing parameters of CDI in the research are operating voltage of 1.4 V, flow rate of 10 mL/min and plante spaceing of 4 mm. The kinetics analysis demonstrated that the electrosorption of NaCl on electrodes during dealing different concentration of NaCl solutions and different operating voltages followed pseudo-first-order model. The ion electrosorption on the electrodes can be represented by the Langmuir equation. This phenomenon indicating that the monolayer adsorption was primary during the electrosorption process. The experiment of adsorption-desorption in desalination process presented a better reversibility of nano-titanium carburizing.