Ultrasonic enhanced flow electrode capacitive deionization device

Abstract

The application discloses an ultrasonic reinforced flow electrode capacitive deionization device, which is characterized in that an ultrasonic transducer is coupled to the side of the current collector of the flow electrode capacitive deionization device, and an ultrasonic generator is used to control the ultrasonic transducer to generate ultrasonic waves, which are applied to the flow electrode inside the flow electrode capacitive deionization device to strengthen the mass transfer and mixing of the flow electrode.Compared with the prior art, the application has the following advantages: 1. The ultrasonic waves are applied to the flow electrode to strengthen the mass transfer and mixing of the flow electrode, thereby improving the electronic charge seepage effect of the flow electrode and further enhancing the transfer and transmission efficiency of the electric charges; 2. The ultrasonic waves effectively prevent and dredge the flow electrode from being blocked in the flow channel, thereby further improving the mass concentration of the electrode material in the flow electrode; and 3. The ultrasonic waves greatly improve the ion adsorption performance of the flow electrode capacitive deionization technology, and the ion adsorption performance is improved by more than 65%.

Description

TECHNICAL FIELD

[0001] The application relates to an ultrasonic reinforced flow electrode capacitive deionization device and belongs to a novel seawater desalination device. BACKGROUND

[0002] The flow electrode capacitive deionization technology is a capacitive deionization technology coupling a positive electrode and a negative electrode flow electrode with anion and cation exchange membranes. The flow electrode in the flow electrode capacitive deionization technology is mainly composed of active electrode material and electrolyte solution and is a carrier for electron transmission and ion adsorption. However, the electron charge seepage effect of the flow electrode is poor, and thus the electron charge transfer and transportation efficiency is poor. At present, in order to improve the charge transfer efficiency of the flow electrode in the flow electrode capacitive deionization device, the following methods are usually used: one is to improve the charge transfer efficiency of the flow electrode by optimizing the electrochemical performance of the electrode material, but the electrode material with excellent electrochemical performance is difficult to be applied to industrial mass production; the other is to improve the charge transfer efficiency by increasing the mass concentration of the electrode material in the flow electrode; however, when the mass concentration of the electrode material reaches a certain degree, the flow channel will be blocked, and thus the ion adsorption performance of the flow electrode capacitive deionization device is reduced. Therefore, a new method needs to be found to further improve the electron charge seepage effect and the mass load of the flow electrode, so as to improve the charge transfer and transportation efficiency of the flow electrode and further improve the ion adsorption performance of the flow electrode capacitive deionization device. SUMMARY

[0003] In view of the problems in the prior art, the application provides an ultrasonic reinforced flow electrode capacitive deionization device, which can improve the charge transfer efficiency and mass load of the flow electrode and greatly improve the ion adsorption performance of the flow electrode capacitive deionization device.

[0004] To achieve the above object, the technical scheme adopted by the application is as follows: an ultrasonic reinforced flow electrode capacitive deionization device, comprising an ultrasonic transducer, an ultrasonic generator and a flow electrode capacitive deionization device.

[0005] The ultrasonic reinforced flow electrode capacitive deionization device is characterized in that the ultrasonic transducer is directly adhered to the current collector in the flow electrode capacitive deionization device, so that the ultrasonic wave directly acts on the flow electrode in the current collector, further accelerates the mass transfer and mixing of the flow electrode, simultaneously utilizes the effect of preventing and dredging blockage of the ultrasonic wave to further increase the mass concentration of the electrode material in the flow electrode, promotes the formation of the charge transfer grid and accelerates the transfer and transportation of the charge, so as to improve the ion adsorption performance.

[0006] The specific working steps of the ultrasonic flow electrode capacitive deionization device are as follows:

[0007] Step one, after the flow electrode capacitive deionization device is built, the ultrasonic transducer is directly bonded on the graphite current collector, then the ultrasonic transducer is connected with the ultrasonic generator, so that the ultrasonic generator controls the start and stop of the ultrasonic wave;

[0008] Step two, when the flow electrode capacitive deionization device starts to run, the ultrasonic generator is started, the ultrasonic wave is transmitted to the flow channel of the current collector, the mass transfer and mixing of the flow electrode are strengthened, so that the electronic charge seepage effect of the flow electrode is improved, the charge transfer and transmission efficiency are further enhanced, and the ion adsorption performance of the ultrasonic enhanced flow electrode capacitive deionization device is improved.

[0009] Compared with the prior art, the present application has the following beneficial effects:

[0010] 1. The ultrasonic wave is used for the flow electrode, the mass transfer and mixing of the flow electrode are strengthened, so that the electronic charge seepage effect of the flow electrode is improved, and the charge transfer and transmission efficiency are further enhanced;

[0011] 2. The ultrasonic wave can effectively prevent and dredge the effect of blockage, further improve the mass concentration of the electrode material in the flow electrode, and make the mass concentration of the flow electrode reach more than 30%wt without blocking the flow channel;

[0012] 3. The ultrasonic enhanced flow electrode capacitive deionization greatly improves the ion adsorption performance of the flow electrode capacitive deionization technology, and the ion adsorption performance is improved by more than 65%. BRIEF DESCRIPTION OF DRAWINGS

[0013] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, made with reference to the accompanying drawings:

[0014] Figure 1 is the overall structure schematic diagram of the device of the present application;

[0015] Figure 2 is the coupling mode diagram of the ultrasonic transducer and the current collector of the device of the present application;

[0016] Figure 3 is the average desalination rate and ion removal rate of the device and the flow electrode capacitive deionization device of the present application;

[0017] Figure 4 is the standardized desalination energy consumption and charge efficiency of the device and the flow electrode capacitive deionization device of the present application;

[0018] Figure 5 is the derived flow channel structure diagram of the device of the present application;

[0019] In the figure: 1-flowing electrode capacitive deionization device, 2-current collector, 3-ultrasonic transducer, 4-ultrasonic generator. DETAILED DESCRIPTION

[0020] The application will be described in detail below with specific examples. The following examples will help those skilled in the art to further understand the application, but do not limit the application in any form. It should be noted that for those skilled in the art, without departing from the concept of the application, a number of modifications and improvements can be made. These are within the scope of the present application.

[0021] Example 1

[0022] The present embodiment provides an ultrasonic enhanced flowing electrode capacitive deionization device and its use method, which specifically comprises the following steps:

[0023] Step one: 2.64 g of activated carbon is dispersed into a 50 mL volume of 1.0 g·L -1 NaCl solution, which is mixed uniformly by a magnetic stirrer to form an activated carbon electrode slurry with a mass fraction of 5%, and a 1.0 g·L -1 NaCl aqueous solution is subjected to desalination treatment by short-circuit closed loop mode at a voltage of 1.2 V. The salt water flow rate is 10.4 mL·min -1 , and the anode and cathode liquid flow rate is 20.8 mL·min -1 .

[0024] Step two: as shown in Figure 1 , the flowing electrode capacitive deionization device is built, in which the ultrasonic transducer is adhered to the current collector, and the adhesion method is as shown in Figure 2 . While the flowing electrode capacitive deionization device is running, the ultrasonic generator is started synchronously, so that the ultrasonic wave acts on the flowing electrode in the current collector, accelerates the mass transfer and mixing of the electrode material particles in the flowing electrode, thereby improving the efficiency of electron transfer and transportation, and preventing the flowing electrode from being blocked in the flow channel of the current collector.

[0025] Step three: during the operation of the device, the ion concentration of the NaCl solution is detected in real time using a Leici conductivity meter, and the current flowing through the inside of the device is monitored in real time using a digital multimeter, and then the final data is processed.

[0026] As shown in Figure 3 and Figure 4 , the ultrasonic enhanced flowing electrode capacitive deionization device used in the present embodiment improves the ion adsorption performance of the flowing electrode capacitive deionization device by 63.5%, and the adsorption performance is greatly improved.

[0027] Example 2

[0028] The other experimental parameters of this embodiment are the same as those of Embodiment 1, and the only difference is that the flow channel structure engraved on the current collector is different. This embodiment adopts a sharp tip structure added on the side wall of the flow channel, as shown in Figure 5 Compared with the ion adsorption performance of the flow electrode capacitive deionization device, the ion adsorption performance is improved by 65.5%, and the adsorption performance is greatly improved.

[0029] The specific embodiments of the present application are described above. It should be understood that the present application is not limited to the specific embodiments described above, and various modifications or changes can be made by those skilled in the art within the scope of the claims, which does not affect the essential content of the present application.

Claims

1. An ultrasonically enhanced flow electrode capacitive deionization device, characterized in that, It includes ultrasonic transducer, ultrasonic generator and flow electrode capacitive deionization device; the frequency of the ultrasonic transducer is 28-40 kHz, and the power is 20 W-100 W; the ultrasonic transducer is directly coupled with the current collector in the flow electrode capacitive deionization device, so that the ultrasonic wave directly acts on the flow electrode in the current collector, prevents the blockage of the flow channel of the current collector, further accelerates the mass transfer and mixing of the activated carbon electrode liquid, promotes the formation of the charge transfer grid, and accelerates the transfer and transportation of the electric charge; the mass concentration of the flow electrode can reach more than 25%-35% without blocking the flow channel, and the effect is improved by more than 65% compared with the flow electrode capacitive deionization; the ultrasonic coupling structure is arranged in the flow channel, so that the ultrasonic wave generates a sharp end effect at the coupling structure in the flow channel, further strengthens the effect of ultrasonic mass transfer and mixing, and thus improves the charge transfer efficiency.

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