A microchannel-spun MXene / BC nanofilm, its preparation method and application

Abstract

This invention belongs to the field of permeation energy conversion technology, and discloses an MXene / BC nanomembrane based on microchannel spinning, its preparation method, and its application. The preparation method includes the following steps: using microchannel spinning, an MXene / BC mixture and a glutaraldehyde solution flow in separately and then flow out together, followed by solidification to obtain an MXene / BC nanomembrane; the aspect ratio of the channel opening in the microchannel spinning membrane is 4–8 mm: 1–2 mm. This invention utilizes microchannel spinning technology, combining the advantages of effectively controlling the microstructure and the macroscopic structure of nanomembranes similar to vacuum filtration. It offers advantages such as convenient use, high production efficiency, more uniform and compact structure, high process controllability, stable product performance, and good environmental friendliness. Under a 50-fold NaCl concentration difference, the MXene / BC nanomembrane achieves an optimal output power density of 23.8 W / m³. 2 .

Description

Technical Field

[0001] This invention relates to the field of permeation energy conversion technology, and in particular to an MXene / BC nanomembrane based on microchannel spinning, its preparation method and application. Background Technology

[0002] With global population growth and economic development, energy demand is constantly increasing. Traditional energy sources such as fossil fuels like coal, oil, and natural gas can no longer meet global energy needs, thus necessitating the search for renewable and environmentally friendly energy sources. The ocean, the largest body of water on Earth, possesses abundant resources, including seawater, ocean energy, and seabed minerals. Utilizing the concentration difference between seawater and river water for infiltration energy generation can fully leverage ocean resources and provide humanity with a sustainable energy source.

[0003] Reverse electrodialysis using highly ion-selective membranes can convert osmotic energy into electrical energy for utilization. Osmotic energy, as a novel green and renewable energy source, has attracted considerable attention in recent years. The bottleneck in osmotic energy power generation lies in combining high ion selectivity with high ion flux while ensuring long-term durability in seawater. Currently, various materials are commonly used in industrial production and experimental research, such as charged graphene, MXene, molybdenum disulfide, and biomass two-dimensional materials.

[0004] As a popular two-dimensional inorganic compound in recent years, MXene is an accordion-shaped multilayer material composed of transition metal nitrides and carbides with a thickness of approximately 1 nm. Due to the large number of hydroxyl groups or terminal oxygen atoms on the surface of its nanosheets, MXene is widely used in supercapacitors, batteries, and electromagnetic shielding. MXene possesses abundant surface charge, thus materials prepared using MXene exhibit high ion selectivity. Adjusting the interlayer spacing between MXene sheets can effectively control ion flux, achieving a combination of high ion flux and high ion selectivity. Cellulose contains a large number of hydroxyl groups; TEMPO oxidation can oxidize the hydroxyl group at position 6 of cellulose to a carboxyl group, significantly increasing the charge of cellulose. Bacterial cellulose (BC) has a more complex spatial network structure than ordinary cellulose; oxidized BC exhibits a spatial network morphology with a large number of negative charges, resulting in good ion selectivity. Inserting BC between MXene layers can effectively adjust the interlayer spacing of MXene, greatly improving ion flux while maintaining ion selectivity.

[0005] Common methods for preparing MXene / BC composite membranes include vacuum filtration, calendering, and cryogenic casting. However, neither vacuum filtration nor cryogenic casting can simultaneously guarantee high flux and high selectivity of the membrane, and structural uniformity is also difficult to ensure. This results in the output power being difficult to exceed the commercial standard (5W / m³) under the concentration difference between river water and seawater. 2Therefore, developing a method for preparing structurally regular, highly oriented MXene / BC composite films is currently a major research direction. Summary of the Invention

[0006] The purpose of this invention is to provide an MXene / BC nanomembrane based on microchannel spinning, its preparation method and application, to solve the problems of non-uniform structure, poor orientation and low membrane flux of existing MXene / BC composite membranes, resulting in low output power.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0008] This invention provides a method for preparing MXene / BC nanofilms based on microchannel spinning, comprising the following steps:

[0009] (1) Prepare MXene solution;

[0010] Bacterial cellulose, TEMPO, NaBr, sodium hypochlorite and water were mixed, the pH was adjusted and an oxidation reaction was carried out, and then homogenized to obtain BC suspension.

[0011] (2) Mix the MXene solution with the BC suspension to obtain an MXene / BC mixture;

[0012] (3) Using microchannel spinning, MXene / BC mixture and glutaraldehyde solution flowed in separately and flowed out together, and solidified to obtain MXene / BC nanofilm;

[0013] The aspect ratio of the channel opening of the microchannel spun membrane is 4-8 mm: 1-2 mm.

[0014] Preferably, in the method for preparing MXene / BC nanofilm based on microchannel spinning, the method for preparing MXene solution in step (1) includes the following steps: mixing lithium fluoride, hydrochloric acid and Ti3AlC2, reacting, centrifuging and washing to obtain MXene solution.

[0015] Preferably, in the method for preparing MXene / BC nanofilm based on microchannel spinning, the oxidation reaction time in step (1) is 3 to 12 hours, and the oxidation reaction temperature in step (1) is 15 to 25°C.

[0016] Preferably, in the method for preparing MXene / BC nanofilm based on microchannel spinning, the concentration of the MXene solution in step (1) is 0.5-2 wt%; and the concentration of the BC suspension in step (1) is 0.1-0.6 wt%.

[0017] Preferably, in the method for preparing MXene / BC nanofilm based on microchannel spinning, the homogenization pressure in step (1) is 6000-10000 Bar, and the homogenization time in step (1) is 5-10 min.

[0018] Preferably, in the method for preparing an MXene / BC nanofilm based on microchannel spinning, the volume ratio of the MXene solution to the BC suspension in step (2) is 1-10:1-20.

[0019] Preferably, in the method for preparing MXene / BC nanofilm based on microchannel spinning, the flow rate of the MXene / BC mixture in step (3) is 400-800 μL / min, and the flow rate of the glutaraldehyde solution in step (3) is 200-700 μL / min.

[0020] The present invention also provides a method for preparing MXene / BC nanofilms based on microchannel spinning.

[0021] This invention also provides an application of MXene / BC nanofilms in permeation power generation, wherein the output power density of the MXene / BC nanofilm is 4–24 W / m³. 2 .

[0022] As can be seen from the above technical solution, compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) Microchannel spinning is an extension of wet spinning. It adds microfluidic technology to the traditional wet spinning rapid prototyping process. By designing different microchannels, fibers of different sizes and morphologies can be customized. Unlike membrane materials that can be used immediately after preparation, fibers are limited in application scenarios in many fields such as permeation energy conversion due to their small cross-sectional area. They still need to undergo spinning and other operations before they can be put into practical use. However, the membrane materials prepared by microchannel spinning can take into account the advantages of regular microstructure and convenient macroscopic application. Therefore, microchannel spinning also has the advantages of wet spinning. Compared with traditional vacuum filtration membrane formation, the microchannel spinning method of this invention has the advantages of high production efficiency, continuous production, more uniform and compact structure, high process controllability, stable product performance, good environmental protection, and reusable coagulation bath. It has good application prospects in the field of permeation energy power generation.

[0024] (2) Scanning electron microscopy clearly shows that the MXene / BC nanofilm prepared by microchannel spinning in this invention has a distinct layered structure, uniform thickness, and regular structure, which is consistent with theoretical expectations.

[0025] (3) This invention obtained MXene / BC nanofilms with different properties by changing the oxidation time of BC by TEMPO; the tested MXene / BC nanofilms achieved an optimal output power density of 23.8 W / m³ under a 50-fold NaCl concentration difference (simulating the concentration difference between river water and seawater). 2 . Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0027] Figure 1 Here is a SEM image of the MXene / BC nanofilm from Example 1;

[0028] Figure 2 The current / output power density test results are for the MXene / BC nanofilm in Example 1;

[0029] Figure 3 This is a SEM image of the MXene / BC nanofilm from Example 2;

[0030] Figure 4 The current / output power density test results are for the MXene / BC nanofilm in Example 2;

[0031] Figure 5 Here is a SEM image of the MXene / BC nanofilm from Example 3;

[0032] Figure 6 The current / output power density test results are for the MXene / BC nanofilm in Example 3;

[0033] Figure 7 Here is a SEM image of the MXene / BC nanofilm from Example 4;

[0034] Figure 8 The current / output power density test results are for the MXene / BC nanofilm in Example 4;

[0035] Figure 9 The image shows a SEM image of the MXene / BC nanofilm in Comparative Example 1.

[0036] Figure 10 The current / output power density test results are for the MXene / BC nanofilm in Comparative Example 1. Detailed Implementation

[0037] This invention provides a method for preparing MXene / BC nanofilms based on microchannel spinning, comprising the following steps:

[0038] (1) Prepare MXene solution;

[0039] Bacterial cellulose, TEMPO, NaBr, sodium hypochlorite and water were mixed, the pH was adjusted and an oxidation reaction was carried out, and then homogenized to obtain BC suspension.

[0040] (2) Mix the MXene solution with the BC suspension to obtain an MXene / BC mixture;

[0041] (3) Using microchannel spinning, MXene / BC mixture and glutaraldehyde solution flowed in separately and flowed out together, and solidified to obtain MXene / BC nanofilm;

[0042] The aspect ratio of the channel opening of the microchannel spun membrane is 4-8 mm: 1-2 mm.

[0043] In this invention, the method for preparing the MXene solution in step (1) preferably includes the following steps: mixing lithium fluoride, hydrochloric acid and Ti3AlC2, reacting, centrifuging and washing to obtain the MXene solution.

[0044] In this invention, the preferred method for the reaction of lithium fluoride, hydrochloric acid and Ti3AlC2 is as follows: lithium fluoride and hydrochloric acid are mixed and stirred, and then Ti3AlC2 is added and stirred to react.

[0045] The present invention does not limit the conditions for preparing the MXene solution; any method known to those skilled in the art can be used.

[0046] In this invention, the concentration of the MXene solution in step (1) is preferably 0.5 to 2 wt%, more preferably 1 to 2 wt%, and even more preferably 2 wt%.

[0047] In this invention, the preferred method for mixing bacterial cellulose, TEMPO, NaBr, sodium hypochlorite and water in step (1) is to mix bacterial cellulose with water, and then add TEMPO, NaBr and sodium hypochlorite in sequence.

[0048] In this invention, the bacterial cellulose in step (1) is sourced from Hainan Yeguo Food Co., Ltd.

[0049] In this invention, the mass ratio of bacterial cellulose, TEMPO and NaBr in step (1) is preferably 1:0.01-0.02:0.1-0.3, more preferably 1:0.015-0.02:0.1-0.2, and even more preferably 1:0.016:0.1.

[0050] In this invention, the preferred ratio of bacterial cellulose, sodium hypochlorite and water in step (1) is 1g:1-10mmol:100-200mL, more preferably 1g:5-10mmol:100-150mL, and even more preferably 1g:5mmol:100mL.

[0051] The present invention does not limit the auxiliary agent used for adjusting pH in step (1), and any alkaline auxiliary agent well known to those skilled in the art can be used. Specifically, in the embodiments of the present invention, the auxiliary agent used for adjusting pH in step (1) is preferably NaOH.

[0052] In this invention, the endpoint of pH adjustment in step (1) is preferably 9 to 11, more preferably 10 to 11, and even more preferably 10.

[0053] In this invention, the oxidation reaction time in step (1) is preferably 3 to 12 hours, more preferably 6 to 12 hours, and even more preferably 12 hours; the oxidation reaction temperature in step (1) is preferably 15 to 25°C, more preferably 20 to 25°C, and even more preferably 25°C.

[0054] In this invention, the oxidation reaction in step (1) preferably further includes centrifugal washing until neutral. This invention does not limit the parameters for the centrifugal washing; any method well-known to those skilled in the art can be used.

[0055] In this invention, the instrument used for homogenization in step (1) is preferably a high-pressure homogenizer.

[0056] In this invention, the homogenization pressure in step (1) is preferably 6000-10000 Bar, more preferably 6000-8000 Bar, and even more preferably 6000 Bar; the homogenization time in step (1) is preferably 5-10 min, more preferably 8-10 min, and even more preferably 10 min.

[0057] In this invention, the concentration of the BC suspension in step (1) is preferably 0.1 to 0.6 wt%, more preferably 0.3 to 0.6 wt%, and even more preferably 0.5 wt%.

[0058] In this invention, the volume ratio of the MXene solution to the BC suspension in step (2) is preferably 1-10:1-20, more preferably 1-5:1-10, and even more preferably 1:1.

[0059] In this invention, the preferred method of microchannel membrane spinning includes: using a cross-shaped channel for microchannel membrane spinning, with the MXene / BC mixture flowing in from one end of the vertical channel, and the glutaraldehyde solution flowing in from both ends of the horizontal channel, and the MXene / BC mixture and the glutaraldehyde solution flowing out from the other end of the vertical channel together; the vertical channel and the horizontal channel are connected.

[0060] In this invention, the aspect ratio of the channel opening of the microchannel spun membrane is preferably 4-8 mm: 1-2 mm, more preferably 5-6 mm: 1-1.5 mm, and even more preferably 5 mm: 1 mm.

[0061] In this invention, the flow rate of the MXene / BC mixture in step (3) is preferably 400-800 μL / min, more preferably 500-600 μL / min, and even more preferably 500 μL / min.

[0062] In this invention, the flow rate of the glutaraldehyde solution in step (3) is preferably 200-700 μL / min, more preferably 300-500 μL / min, and even more preferably 300 μL / min.

[0063] In this invention, the mass concentration of the glutaraldehyde solution in step (3) is preferably 20-50%, more preferably 25-35%, and even more preferably 25%.

[0064] In this invention, the coagulation bath used in step (3) is preferably 99 wt% acetic acid.

[0065] In this invention, the solidified membrane material in step (3) is preferably collected by a roller. This invention does not limit the rotational speed of the roller; any method well-known to those skilled in the art can be used.

[0066] The present invention also provides a method for preparing MXene / BC nanofilms based on microchannel spinning.

[0067] This invention also provides an application of MXene / BC nanofilms in permeation power generation. The method for this application is not limited to any particular method; any solution well-known to those skilled in the art can be used.

[0068] In this invention, the output power density of the MXene / BC nanofilm is preferably 4–24 W / m². 2 Further preferred values ​​are 6–23.8 W / m 2 More preferably 23.8W / m 2 .

[0069] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0070] Example 1

[0071] This embodiment provides a method for preparing MXene / BC nanofilms based on microchannel spinning, including the following steps:

[0072] (1) Measure 1.6g of lithium fluoride and add it to 15mL of 9mol / L HCl solution and stir for 5min; then add 1g of Ti3AlC2 and stir at 500rpm for 36h at 35℃; transfer the reaction solution to a centrifuge bottle, centrifuge at 3500r / min for 10min, wash until neutral, and obtain a 2wt% MXene solution;

[0073] 1g of BC (manufactured by Hainan Yeguo Food Co., Ltd.) was dispersed in 100mL of deionized water, and then 0.016g of TEMPO, 0.1g of NaBr and 5mmol of sodium hypochlorite were added sequentially to obtain a mixed system. NaOH solution was added to maintain the pH of the mixed system at 10, and the mixture was stirred continuously at 25℃ for 3h. Subsequently, the reacted BC was washed with deionized water by centrifugation until neutral, and then added to a high-pressure homogenizer and homogenized at 6000Bar for 10min to obtain a BC suspension with a concentration of 0.5wt%.

[0074] (2) Take 5 mL of MXene solution and 5 mL of BC suspension, stir well to obtain MXene / BC mixture;

[0075] (3) Microchannel spinning was used, with a cross-shaped channel. The channel opening was 5 mm long and 1 mm wide. The MXene / BC mixture was injected from one end of the vertical channel at a speed of 500 μL / min, and the 25% glutaraldehyde solution was injected from both ends of the horizontal channel at a speed of 300 μL / min. The two solutions then flowed out from the other end of the vertical channel into a coagulation bath of 99 wt% acetic acid. The solidified membrane was collected by a roller at a speed of 20 rpm. The membrane was removed from the coagulation bath and dried at room temperature to obtain the MXene / BC nanomembrane.

[0076] The MXene / BC nanofilm from Example 1 was observed using SEM, and the results are as follows: Figure 1 As shown. By Figure 1It can be seen that the composite nanofilm of BC and MXene oxidized by TEMPO for 3 hours exhibits a distinct layered structure with clear boundaries between layers. BC acts as an intercalating agent, inserting between the MXene layers and bonding through hydrogen bonds to form… Figure 1 The layered MXene / BC nanofilm shown.

[0077] The current / output power density of the MXene / BC nanofilm in Example 1 was tested under different resistances, and the results are as follows: Figure 2 As shown. By Figure 2 It can be seen that due to the short TEMPO oxidation time, the surface charge content of the nanofilm is relatively low, resulting in a small improvement in ion flux, but an increase in output power density, with a maximum output power density of 4.17 W / m. 2 However, it has not yet reached the level of industrialization.

[0078] Example 2

[0079] This embodiment provides a method for preparing MXene / BC nanofilms based on microchannel spinning, including the following steps:

[0080] (1) The preparation method of MXene solution is the same as in Example 1;

[0081] The preparation method of BC suspension differs from that of Example 1 in that the continuous stirring time is replaced with 6 hours, while other conditions are the same as in Example 1.

[0082] (2) Take 5 mL of MXene solution and 5 mL of BC suspension, stir well to obtain MXene / BC mixture;

[0083] (3) Microchannel spinning was used, with a cross-shaped channel. The channel opening was 5 mm long and 1 mm wide. The MXene / BC mixture was injected from one end of the vertical channel at a speed of 500 μL / min, and the 25% glutaraldehyde solution was injected from both ends of the horizontal channel at a speed of 300 μL / min. The two solutions then flowed out from the other end of the vertical channel into a coagulation bath of 99 wt% acetic acid. The solidified membrane was collected by a roller at a speed of 20 rpm. The membrane was removed from the coagulation bath and dried at room temperature to obtain the MXene / BC nanomembrane.

[0084] The MXene / BC nanofilm from Example 2 was observed using SEM, and the results are as follows: Figure 3 As shown. By Figure 3 It can be seen that the cross-section of the composite nanofilm of BC and MXene oxidized by TEMPO for 6 hours exhibits a distinct layered structure, and the morphology is not significantly different from that of the nanofilm in Example 1.

[0085] The current / output power density of the MXene / BC nanofilm in Example 2 was tested under different resistances, and the results are as follows: Figure 4 As shown. By Figure 4 It can be seen that due to the increased TEMPO oxidation time, the surface charge content of the nanofilm increases, resulting in a significant increase in output power density, with a maximum output power density of 8 W / m². 2 It far exceeds the level of industrial production.

[0086] Example 3

[0087] This embodiment provides a method for preparing MXene / BC nanofilms based on microchannel spinning, including the following steps:

[0088] (1) The preparation method of MXene solution is the same as in Example 1;

[0089] The preparation method of BC suspension differs from that of Example 1 in that the continuous stirring time is replaced with 12 hours, while other conditions are the same as in Example 1.

[0090] (2) Take 5 mL of MXene solution and 5 mL of BC suspension, stir well to obtain MXene / BC mixture;

[0091] (3) Microchannel spinning was used, with a cross-shaped channel. The channel opening was 5 mm long and 1 mm wide. The MXene / BC mixture was injected from one end of the vertical channel at a speed of 500 μL / min, and the 25% glutaraldehyde solution was injected from both ends of the horizontal channel at a speed of 300 μL / min. The two solutions then flowed out from the other end of the vertical channel into a coagulation bath of 99 wt% acetic acid. The solidified membrane was collected by a roller at a speed of 20 rpm. The membrane was removed from the coagulation bath and dried at room temperature to obtain the MXene / BC nanomembrane.

[0092] The MXene / BC nanofilm from Example 3 was observed using SEM, and the results are as follows: Figure 5 As shown. By Figure 5 It can be seen that the cross-section of the composite nanofilm of BC and MXene oxidized by TEMPO for 12 hours exhibits a distinct layered structure, and the morphology is not significantly different from that of the nanofilm in Example 1.

[0093] The current / output power density of the MXene / BC nanofilm in Example 3 was tested under different resistances, and the results are as follows: Figure 6 As shown. By Figure 6 As can be seen, due to the significantly increased TEMPO oxidation time, the surface charge content of the nanofilm increases, resulting in a very significant increase in output power density, with the maximum output power density reaching 23.8 W / m². 2 It far exceeds the level of industrial production.

[0094] Example 4

[0095] This embodiment provides a method for preparing MXene / BC nanofilms based on microchannel spinning, including the following steps:

[0096] (1) The preparation method of MXene solution is the same as in Example 1;

[0097] The preparation method of BC suspension differs from that of Example 1 in that the continuous stirring time is replaced with 12 hours, while other conditions are the same as in Example 1.

[0098] (2) Take 5 mL of MXene solution and 10 mL of BC suspension, stir well to obtain MXene / BC mixture;

[0099] (3) Microchannel spinning was used, with a cross-shaped channel. The channel opening was 5 mm long and 1 mm wide. The MXene / BC mixture was injected from one end of the vertical channel at a speed of 500 μL / min, and the 25% glutaraldehyde solution was injected from both ends of the horizontal channel at a speed of 300 μL / min. The two solutions then flowed out from the other end of the vertical channel into a coagulation bath of 99 wt% acetic acid. The solidified membrane was collected by a roller at a speed of 20 rpm. The membrane was removed from the coagulation bath and dried at room temperature to obtain the MXene / BC nanomembrane.

[0100] The MXene / BC nanofilm from Example 4 was observed using SEM, and the results are as follows: Figure 7 As shown. By Figure 7 It can be seen that although the MXene / BC nanofilm formed a relatively obvious layered structure, the increase in BC content destroyed the layered structure of MXene. Compared with the uniform and flat layered structure of the nanofilm with low BC content, the layered structure of the nanofilm obtained in Example 4 is not flat, and many places are bent and folded, and the regularity of the nanofilm is greatly reduced.

[0101] The current / output power density of the MXene / BC nanofilm in Example 4 was tested under different resistances, and the results are as follows: Figure 8 As shown. By Figure 8 It can be seen that due to the increase in BC content, the surface charge content of the nanofilm decreases, and the output power density also decreases accordingly, with the maximum output power density being only 6 W / m. 2 The performance is greatly reduced.

[0102] Comparative Example 1

[0103] This comparative example provides a method for preparing MXene / BC nanofilms based on microchannel spinning, including the following steps:

[0104] (1) The preparation method of MXene solution is the same as in Example 1;

[0105] 1g of BC (manufactured by Hainan Yeguo Food Co., Ltd.) was dispersed in deionized water to prepare a BC suspension with a concentration of 0.5wt%.

[0106] (2) Take 5 mL of MXene solution and 5 mL of BC suspension, stir well to obtain MXene / BC mixture;

[0107] (3) Microchannel spinning was used, with a cross-shaped channel. The channel opening was 5 mm long and 1 mm wide. The MXene / BC mixture was injected from one end of the vertical channel at a speed of 500 μL / min, and the 25% glutaraldehyde solution was injected from both ends of the horizontal channel at a speed of 300 μL / min. The two solutions then flowed out from the other end of the vertical channel into a coagulation bath of 99 wt% acetic acid. The solidified membrane was collected by a roller at a speed of 20 rpm. The membrane was removed from the coagulation bath and dried at room temperature to obtain the MXene / BC nanomembrane.

[0108] The MXene / BC nanofilm of Comparative Example 1 was observed by SEM, and the results are as follows: Figure 9 As shown. By Figure 9 It can be seen that the cross-section of the MXene / BC nanofilm without TEMPO oxidation exhibits a layered structure, but its layered structure is not obvious compared to the nanofilm after TEMPO oxidation.

[0109] The current / output power density of the MXene / BC nanofilm in Comparative Example 1 was tested under different resistances, and the results are as follows: Figure 10 As shown. By Figure 10 It can be seen that the maximum output power density of the nanofilm obtained in Comparative Example 1 is only 3.6 W / m. 2 However, it did not reach the industrial level and was significantly lower than that of Embodiment 1 of the present invention.

[0110] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing MXene / BC nanofilms based on microchannel spinning, characterized in that, Includes the following steps: (1) Prepare MXene solution; Bacterial cellulose, TEMPO, NaBr, sodium hypochlorite and water were mixed, the pH was adjusted and an oxidation reaction was carried out, and then homogenized to obtain BC suspension. (2) Mix the MXene solution with the BC suspension to obtain an MXene / BC mixture; (3) Using microchannel spinning, MXene / BC mixture and glutaraldehyde solution flowed in separately and flowed out together, and solidified to obtain MXene / BC nanofilm; The aspect ratio of the channel opening of the microchannel spun membrane is 4-8 mm: 1-2 mm.

2. The method for preparing MXene / BC nanofilms based on microchannel spinning as described in claim 1, characterized in that, The method for preparing the MXene solution in step (1) includes the following steps: mixing lithium fluoride, hydrochloric acid and Ti3AlC2, reacting, centrifuging and washing to obtain the MXene solution.

3. The method for preparing MXene / BC nanofilms based on microchannel spinning as described in claim 1, characterized in that, The oxidation reaction in step (1) takes 3 to 12 hours and the oxidation reaction in step (1) takes 15 to 25°C.

4. A method for preparing MXene / BC nanofilms based on microchannel spinning as described in any one of claims 1 to 3, characterized in that, The concentration of the MXene solution in step (1) is 0.5–2 wt%; the concentration of the BC suspension in step (1) is 0.1–0.6 wt%.

5. A method for preparing MXene / BC nanofilms based on microchannel spinning as described in claim 1 or 3, characterized in that, The homogenization pressure in step (1) is 6000-10000 Bar, and the homogenization time in step (1) is 5-10 min.

6. The method for preparing MXene / BC nanofilms based on microchannel spinning as described in claim 1, characterized in that, In step (2), the volume ratio of the MXene solution to the BC suspension is 1-10:1-20.

7. A method for preparing MXene / BC nanofilms based on microchannel spinning as described in claim 1 or 6, characterized in that, The flow rate of the MXene / BC mixture in step (3) is 400-800 μL / min, and the flow rate of the glutaraldehyde solution in step (3) is 200-700 μL / min.

8. The MXene / BC nanofilm prepared by the method of microchannel spinning based on any one of claims 1 to 7.

9. The application of the MXene / BC nanofilm according to claim 8 in permeation power generation, characterized in that, The output power density of the MXene / BC nanofilm is 4–24 W / m². 2 .

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