A kind of water droplet triboelectric coupling PMS promotes the synchronous filtration catalytic device of conductive limited membrane catalysis

Abstract

This invention belongs to the field of catalytic membrane technology for water treatment, and relates to a simultaneous filtration catalytic device that uses triboelectric coupling (PMS) to promote conductive confined membrane catalysis. The conductive confined membrane is subjected to cross-flow filtration via a cross-flow filtration pump and is fixed within the membrane filtration device. A filtered water collection device is located below the membrane filtration device. A droplet controller is located at the bottom of the filtered water collection device. A triboelectric power generation plate is placed inside a dust cover below the droplet controller. The triboelectric power generation plate uses various materials suitable for triboelectric nano-power generation and becomes charged through friction with water droplets falling from the droplet controller. The triboelectric power generation plate includes a triboelectric PVDF plate, with an upper conductive copper sheet on the upper surface and a lower conductive copper tape on the lower surface. The upper conductive copper sheet is connected to the conductive confined membrane via a wire. This invention achieves the collection and efficient utilization of micro-energy within a limited reaction device, significantly improving membrane treatment efficiency and antifouling ability, and realizing green and efficient water treatment.

Description

Technical Field

[0001] This invention belongs to the field of catalytic membrane technology for water treatment, and specifically relates to a simultaneous filtration catalytic device that promotes conductive confined membrane catalysis by water droplet triboelectric coupling PMS. Background Technology

[0002] Water treatment technology is crucial for ensuring ecological security and human health. Current water treatment technologies primarily rely on gravitational potential energy or pumps for energy, inevitably resulting in energy loss. Collecting these underutilized micro-energy sources and applying them to membrane treatment processes would significantly promote the low-carbon and high-efficiency aspects of water treatment technology.

[0003] In recent years, triboelectric nanogenerators (TENGs) have attracted attention for their ability to harvest micro-energy from the environment through contact charging and electrostatic induction. In electrocatalytic reactions, the high-voltage characteristics of TENGs, often overlooked, can significantly influence mass transport and molecular transfer at two-phase interfaces. Particularly in confined spaces, high voltage can polarize matter around the interface, significantly altering the adhesion of matter to the surface and internal mass transfer under the combined effects of electrophoresis and electric fields. In this context, utilizing high-voltage pulsed electricity captured from the environment at the microscopic molecular scale can optimize molecular arrangement within the nanoscale confinement domain to achieve selective mass transfer and promote catalytic reactions in membranes. Simultaneously, the presence of the pulsed voltage also inhibits the adsorption of pollutants on the membrane surface and within the membrane pores, thereby improving the membrane's antifouling performance.

[0004] Therefore, by utilizing the pulsed electrical signals generated by the friction between the droplets collected during the permeation process and the triboelectric plate 7, and then transmitting these signals through wires to the interior of the conductive confinement membrane 1, it is possible to simultaneously control pollutants of different sizes and types on the membrane surface and within the membrane pores, and to promote the generation of active substances during membrane filtration. Compared to traditional electrochemical reactions, the nanoconfinement effect amplifies the interfacial molecular motion induced by transient pulse electricity, thereby effectively degrading pollutants without requiring high current densities. Summary of the Invention

[0005] To alleviate fouling issues in membrane filtration and improve the removal efficiency of catalytic filtration, this invention provides a green triboelectric pulse cleaning strategy based on droplet energy. The clean energy generated by the contact separation between droplets and the triboelectric power generation plate 7 enhances the ability of PMS to degrade pollutants during conductive catalytic membrane filtration and improves the membrane's antifouling performance.

[0006] The technical solution adopted in this invention is:

[0007] A simultaneous filtration catalytic device for promoting conductive confined membrane catalysis by water droplet triboelectric coupling PMS includes a filtered water collection device, a droplet controller, a triboelectric generator plate, and a conductive confined membrane.

[0008] The conductive confinement membrane is subjected to cross-flow filtration via a cross-flow filtration pump.

[0009] The conductive confinement membrane is fixed in the membrane filtration device.

[0010] The filtered water collection device is located below the membrane filtration device and is used to collect the filtered water after the membrane.

[0011] The bottom of the filtered water collection device is equipped with a droplet controller, which uses a medical syringe to control the stable flow of water sample droplets. Below the droplet controller is a dust cover, inside which is placed a triboelectric power generation plate. The triboelectric power generation plate is located below the filtered water collection device and directly opposite the water outlet of the droplet controller. The triboelectric power generation plate can be made of various materials suitable for triboelectric nano-power generation, and it becomes charged through friction with the water droplets falling from the droplet controller.

[0012] The triboelectric power generation plate includes a triboelectric PVDF plate, with an upper conductive copper sheet on the upper surface and a lower conductive copper tape on the lower surface. The upper conductive copper sheet is connected to a conductive confinement film via a wire.

[0013] The triboelectric plate is fixed on the base, and the vertical distance between the water droplets and the triboelectric plate is adjusted by adjusting the height of the droplet controller.

[0014] The conductive confinement film comprises conductive nanosheets and catalytic nanosheets; the conductive confinement film is formed by stacking conductive nanosheets and catalytic nanosheets. The conductive confinement film is prepared by vacuum self-assembly of conductive nanosheets and catalytic nanosheets.

[0015] The method for preparing the conductive nanosheets is as follows: Lithium fluoride is dissolved in hydrochloric acid by stirring, then stirred on a constant-temperature magnetic stirrer. MAX material is added, and Al atoms are selectively etched away. After centrifugation and washing, multilayer MXene is obtained. Then, the multilayer MXene is placed in a centrifuge tube, filled with nitrogen to remove oxygen, sonicated, centrifuged, and the supernatant is collected and dried to prepare a single-layer MXene material.

[0016] The method for preparing the catalytic nanosheets 11 involves adding 27 mg of Co(NO3)2, 44 mg of Fe(NO3)2, and 330 mg of (NH4)2MoO4 to 100 mL of ultrapure water. After adjusting the pH to 9.6, a flocculent precipitate is formed. The reaction mixture is then placed in a hydrothermal reactor at 80 °C and reacted for 24 hours. The resulting precipitate is then rinsed three times with deionized water and dried overnight in a vacuum oven.

[0017] Compared with existing technologies, the present invention has the following advantages:

[0018] 1. The present invention provides a simultaneous filtration catalytic device for promoting conductive confined membrane catalysis by water droplet triboelectric coupling PMS. When used for membrane treatment, it not only has catalytic and separation capabilities, but can also further enhance the efficient degradation of pollutants by using pulsed electrical energy.

[0019] 2. The simultaneous filtration catalytic device of the present invention, which promotes conductive confined membrane catalysis by water droplet triboelectric coupling PMS, uses the gravitational potential energy of the water droplets themselves as the source of electrical energy when used in membrane treatment, without the introduction of external energy, thereby improving efficiency without adding excessive costs.

[0020] 3. The simultaneous filtration catalytic device of the present invention, which promotes conductive confined membrane catalysis by water droplet triboelectric coupling PMS, has significant membrane antifouling ability and a certain self-cleaning ability when used in membrane treatment, which can reduce the replacement of membrane modules and reduce energy consumption and cost. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure provided by the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the conductive confinement film provided by the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the water droplet friction power generation plate provided by the present invention;

[0025] Figure 4 This is a data diagram of antifouling properties of the water droplet triboelectric assisted membrane filtration provided by the present invention;

[0026] Figure 5 This is a data diagram of catalytic filtration using a water droplet triboelectric radiation membrane provided by the present invention;

[0027] Figure 6 This is a physical diagram of the water droplet triboelectric device provided by the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0029] like Figure 1 , Figure 2 and Figure 3 As shown in the embodiment of the present invention, a simultaneous filtration catalytic device for promoting conductive confined membrane catalysis by water droplet triboelectric coupling PMS includes a conductive confined membrane 1, a membrane filtration device 2, a filtered water collection device 3, a droplet controller 4, a water droplet 5, a dust cover 6, a triboelectric generator 7, a wire 8, and a cross-flow filtration pump 9.

[0030] The conductive confinement membrane 1 is subjected to cross-flow filtration by the cross-flow filtration pump 9.

[0031] The conductive confinement membrane 1 is fixed in the membrane filtration device 2.

[0032] The filtered water collection device 3 is located below the membrane filtration device 2 and is used to collect the filtered water after the membrane.

[0033] The bottom of the filtered water collection device 3 is equipped with a droplet controller 4, which uses a medical syringe to control the stable flow of water sample droplets 5. Below the droplet controller 4 is a dust cover 6, inside which is placed a triboelectric power generation plate 7. The triboelectric power generation plate 7 is located below the filtered water collection device 3 and directly opposite the water outlet of the droplet controller 4. The triboelectric power generation plate 7 can be made of various materials suitable for triboelectric nano-power generation, and it becomes charged through friction with the water droplets 5 falling from the droplet controller 4.

[0034] The triboelectric power generation plate 7 includes a triboelectric PVDF plate 12, with an upper conductive copper sheet 13 on the upper surface and a lower conductive copper tape 14 on the lower surface. The upper conductive copper sheet 13 is connected to the conductive confinement film 1 via a wire 8.

[0035] The conductive confinement film 1 includes conductive nanosheets 10 and catalytic nanosheets 11; the conductive confinement film 1 is formed by stacking conductive nanosheets 10 and catalytic nanosheets 11.

[0036] Water droplets 5 generate triboelectricity by sliding on the PVDF plate 12, and then transfer charge through contact with the upper conductive copper sheet 13. The charge is transferred to the conductive confinement film 1 via wires 8, thereby achieving the repulsion of pollutants and the activation of the catalyst.

[0037] like Figure 4As shown, in order to improve the antifouling ability of the membrane, the pulse charge generated by the triboelectric plate 7 is continuously or intermittently supplied to the conductive confinement membrane 1, and the antifouling of the membrane is achieved by the electric field and electrophoretic force generated by the pulse charge.

[0038] like Figure 5 As shown, the pulsed charges generated by the triboelectric plate 7 are transferred to the conductive confinement film 1 via the wire 8. This generates a pulsed micro-electric field between the conductive nanosheets 10, causing pollutants and PMS to periodically move towards the catalytic nanosheets 11, thereby improving the pollutant removal efficiency. The physical device of water droplet triboelectricity is shown in the figure. Figure 6 As shown.

Claims

1. A simultaneous filtration catalytic device for promoting conductive confined membrane catalysis via water droplet triboelectric coupling PMS, characterized in that, It includes a filtered water collection device (3), a droplet controller (4), and a triboelectric plate (7); The conductive confinement membrane (1) is subjected to cross-flow filtration by a cross-flow filtration pump (9); The conductive confinement membrane (1) is fixed in the membrane filtration device (2); The filtered water collection device (3) is located below the membrane filtration device (2) and is used to collect the filtered water after the membrane. The bottom of the filtered water collection device (3) is provided with a droplet controller (4), which is used to control the stable outflow of water droplets (5); The triboelectric plate (7) is placed inside the dust cover (6). The triboelectric plate (7) is located below the water collection device (3) and directly opposite the water outlet of the droplet controller (4). The triboelectric plate (7) is made of triboelectric nano-power generation material and becomes charged by friction with the water droplets (5) falling in the droplet controller (4). The triboelectric power generation plate (7) includes a triboelectric PVDF plate (12), with an upper conductive copper sheet (13) on the upper surface of the triboelectric PVDF plate (12), which is connected to the conductive confinement film (1) through a wire (8); and a lower conductive copper tape (14) on the lower surface for induction charging.

2. The simultaneous filtration catalytic device for promoting conductive confined membrane catalysis by water droplet triboelectric coupling PMS according to claim 1, characterized in that, The conductive confinement film (1) is formed by stacking conductive nanosheets (10) and catalytic nanosheets (11).

3. The simultaneous filtration catalytic device for promoting conductive confined membrane catalysis by water droplet triboelectric coupling PMS according to claim 1, characterized in that: The method for preparing the conductive nanosheets (10) is as follows: (1) Lithium fluoride was dissolved in hydrochloric acid and stirred on a constant temperature magnetic stirrer. MAX material was added to selectively etch away Al atoms. After centrifugation and washing, the mixture was filtered through a filter membrane to obtain multilayer MXene. (2) The precipitate on the filter membrane was put back into the centrifuge tube, filled with nitrogen to remove oxygen, and after sonication and centrifugation, the supernatant was taken, dried, and prepared into a single-layer MXene material as a conductive nanosheet (10).

4. The simultaneous filtration catalytic device for promoting conductive confined membrane catalysis by water droplet triboelectric coupling PMS according to claim 1, characterized in that: The preparation method of the catalytic nanosheets (11): (1) 27 mg of Co(NO3)2, 44 mg of Fe(NO3)2, and 330 mg of (NH4)2MoO4 were added to 100 mL of ultrapure water, respectively. After adjusting the pH to 9.6, flocculent precipitates formed in the solution. (2) The reaction mixture was then placed in a hydrothermal reactor at 80°C and reacted for 24 hours. The resulting precipitate was rinsed three times with deionized water and dried overnight in a vacuum oven. The resulting material was used as catalytic nanosheets (11).

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