A deionization and ion-concentrating apparatus without membrane is connected to a power supply and includes a microfluidic channel, two current collectors and an electroactive material. The microfluidic channel is disposed between the two current collectors. The power supply applies voltage to the two current collectors. The electroactive material is coated and connected to at least one of the two current collectors, and the electroactive material shows reversible redox ability. Therefore, with the special structural configuration of the microfluidic channel and the characteristic of the electroactive material, the overall processing efficiency of the deionization and ion-concentrating apparatus can be improved, and a non-membrane structure can be achieved. Thus, the problems of fouling, aging, high maintenance costs and complex operation of the membrane-based device and module can be solved. |