Ceramic membrane with MoS2 functional layer and preparation method and application thereof

Abstract

The present invention belongs to the technical field of ceramic membranes and their preparation, and specifically relates to a ceramic membrane with a MoS2 functional layer, its preparation method and application. The preparation method of the ceramic membrane with a MoS2 functional layer according to the present invention includes the following steps: ultrasonically cleaning the ceramic membrane in water first, then ultrasonically cleaning it in ethanol, and drying; dispersing a molybdenum source, a sulfurizing agent, and polyvinylpyrrolidone (PVP) in water and mixing them evenly by constant-temperature stirring to form a precursor solution; completely immersing the treated ceramic membrane in the precursor solution, sealing it in a reaction kettle for hydrothermal reaction, taking it out, rinsing, and drying to obtain a ceramic membrane with a MoS2 functional layer. The preparation method of the ceramic membrane with a MoS2 functional layer provided by the present invention has a high catalytic performance and a high filtration accuracy for the prepared ceramic membrane with a MoS2 functional layer. When it is applied to wastewater treatment, it will not cause the problem of secondary pollution.

Description

Technical Field

[0001] The present invention belongs to the technical field of ceramic membranes and preparation thereof, and in particular relates to a ceramic membrane with a MoS2 functional layer and a preparation method and application thereof. Background Art

[0002] In recent decades, the rapid expansion of the chemical and petroleum industries has significantly increased the discharge of industrial wastewater, which contains a variety of organic compounds such as dyes, detergents, pharmaceuticals, personal care products, pesticides and hydrocarbons. Even at low concentrations, these pollutants are toxic, carcinogenic, persistent and mutagenic, posing a serious threat to the ecological environment and human health. Although there are many traditional treatment methods, such as adsorption, coagulation, filtration, membrane separation and oxidation, which can be used alone or in combination to enhance the removal effect, they still face limitations such as low degradation efficiency, high energy consumption and treatment costs, prompting the industry to urgently develop new and efficient treatment technologies.

[0003] Ceramic membrane technology, especially nanofiltration and reverse osmosis technology, has shown significant advantages in removing trace pollutants. However, ceramic membranes currently rely mainly on physical filtration and are susceptible to contamination, and need to be combined with other technologies to improve the removal efficiency of organic pollutants. Combining ceramic membranes with advanced oxidation processes (such as ozone oxidation) is seen as a potential solution that can effectively degrade pollutants and reduce membrane fouling.

[0004] As an advanced oxidation process, ozone oxidation technology can completely mineralize organic pollutants, but its solubility is limited and its oxidation potential is fixed, so its effect is limited when used alone. Combining it with a metal catalyst can improve ozone utilization, but there are problems such as difficulty in catalyst recovery and secondary pollution caused by metal ion leakage.

[0005] To solve these problems, the coupling process of catalytic ozone oxidation and ceramic membrane separation technology came into being. However, the current catalytic ceramic membrane preparation mostly adopts direct doping technology, which leads to catalyst agglomeration, low utilization of active sites, and easy formation of membrane defects, affecting the filtration accuracy and the binding force between the catalyst and the membrane, and fails to effectively curb the secondary pollution problem caused by metal ion leakage. The existing catalytic ceramic membrane preparation method mainly relies on direct doping technology, which leads to catalyst aggregation, reduced catalytic activity and membrane defects. For example, CN106745673A prepares a microporous ozone catalytic ceramic membrane through a specific process, which improves the catalytic efficiency and mass transfer efficiency. However, this method involves a variety of chemical additives, which increases costs and environmental burdens. CN104841292A discloses an ozone catalytic functional ceramic membrane and a preparation method thereof, which aims to construct a three-dimensional multi-stage catalyst body and improve catalytic efficiency. However, this method requires a circulating pump to drive a circulating coating device, which prolongs the preparation time and increases energy consumption.

[0006] CN113663530A discloses a polyamide ceramic composite nanofiltration membrane containing a MoS2 intermediate layer and a preparation method thereof, wherein a molybdenum source and a sulfur source compound are weighed, added to deionized water to obtain a precursor solution, the precursor solution is poured into a para-polyphenyl liner, and the tubular ceramic matrix is ​​completely immersed in the precursor solution; then, the liner is sealed and placed in a stainless steel reactor, and isothermally reacted at 100 to 360°C to obtain a ceramic matrix containing a MoS2 intermediate layer. However, the preparation process is cumbersome, and in the process of forming the MoS2 functional layer, the non-uniform solution easily causes uneven loading of the MoS2 functional layer, thereby affecting the filtration performance of the ceramic membrane. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the above-mentioned defects of the prior art and provide a method for preparing a ceramic membrane with a MoS2 functional layer. The prepared ceramic membrane with a MoS2 functional layer has high catalytic performance and high filtration accuracy. It can be used in wastewater treatment without causing secondary pollution.

[0008] The method for preparing a ceramic membrane having a MoS2 functional layer according to the present invention comprises the following steps:

[0009] 1) First, ultrasonically clean the ceramic membrane in water, then in ethanol, and dry it;

[0010] 2) Disperse the molybdenum source, the vulcanizing agent, and polyvinyl pyrrolidone (PVP) in water and mix them, and stir them evenly at a constant temperature to form a precursor solution;

[0011] 3) The ceramic membrane treated in step 1) is completely immersed in the precursor solution in step 2), sealed in a reaction kettle for hydrothermal reaction, taken out, rinsed, and dried to obtain a ceramic membrane with a MoS2 functional layer.

[0012] The molybdenum source is one of ammonium molybdate and sodium molybdate; the vulcanizing agent is one of thiourea, thioacetamide and sulfur powder.

[0013] The ceramic membrane is an alumina flat ceramic membrane or a tubular ceramic membrane. The tubular ceramic membrane is a single-channel or multi-channel pipeline.

[0014] In step 1), the ultrasonic cleaning time in water is 10-60 minutes, the ultrasonic cleaning time in ethanol is 0.5-2 hours, the drying temperature is 50-105° C., and the drying time is 12-24 hours. The water is deionized water.

[0015] In step 2), the constant temperature stirring temperature is 20-40°C, and the constant temperature stirring speed is 300-1200r / min.

[0016] In step 2), the concentration of the molybdenum source is 0.02-0.10 mol / L; the concentration of the sulfiding agent is 0.06-0.24 mol / L; and the concentration of the polyvinyl pyrrolidone is 0.12-0.50 mol / L.

[0017] In step 3), the hydrothermal reaction temperature is 180-240° C., and the hydrothermal reaction time is 12-24 hours.

[0018] In step 3), the drying temperature is 50-105°C and the drying time is 12-24h.

[0019] The ceramic membrane with the MoS2 functional layer is prepared by the preparation method, and has a loading amount of 1.2-4 mg / g, a particle size of 105-200 nm, and a water contact angle of 1.78-4.7°.

[0020] The application of the ceramic membrane with MoS2 functional layer: using it in an ozone catalytic membrane reactor device to treat wastewater.

[0021] Specifically, the method for preparing the ceramic membrane having the MoS2 functional layer comprises the following steps:

[0022] 1) First, ultrasonically clean the ceramic membrane in deionized water for 10-60 minutes, then ultrasonically clean it in ethanol for 0.5-2 hours, and dry it at 50-105℃ for 12-24 hours;

[0023] 2) Disperse the molybdenum source, sulfiding agent and PVP in deionized water and mix them. The concentration of the molybdenum source is 0.02-0.10 mol / L, the concentration of the sulfiding agent is 0.06-0.24 mol / L, and the concentration of PVP is 0.12-0.50 mol / L. Stir evenly at a constant temperature of 20-40°C and a speed of 300-1200 r / min to form a precursor solution.

[0024] 3) The ceramic membrane treated in step 1) is completely immersed in the precursor solution of step 2), sealed in a reaction kettle for hydrothermal reaction at 180-240°C for 12-24h, taken out for rinsing, and dried at 50-105°C for 12-24h to obtain a ceramic membrane with a MoS2 functional layer.

[0025] The ceramic membrane with MoS2 functional layer prepared by the present invention realizes the loading of the catalytic MoS2 functional layer through a simple hydrothermal method. Due to the adsorption effect of the ceramic membrane, MoS2 is not only uniformly loaded on the surface of the ceramic membrane, but also loaded on the pore walls. The catalytic ozonation reaction in the pores of the ceramic membrane is equivalent to countless "nanoreactors" taking place simultaneously. Ozone has more opportunities to contact the catalyst, and the shortened diffusion distance can complete the mass transfer process within milliseconds, significantly improving its catalytic efficiency.

[0026] The ceramic membrane prepared by the present invention does not carry out mixed doping of catalyst and ceramic particles, but is only loaded on the membrane layer and pore walls, and does not destroy the membrane layer structure. The pore size of the ceramic membrane prepared by the present invention and the amount of MoS2 loaded can be adjusted by the number of hydrothermal methods to meet the material customization under specific circumstances. The ceramic membrane with MoS2 functional layer prepared by the present invention does not expand during solvent filtration, can withstand high temperature and backwash pressure, and can resist detergents and oxidants, and has stability.

[0027] The MoS2 loaded on the ceramic membrane prepared by the present invention is composed of three atomic layers, wherein the molybdenum atomic layer is sandwiched between two sulfur atomic layers, presenting a disordered fragment-like morphology, having a large specific surface area, and having good adsorption properties.

[0028] Existing methods of loading catalysts on functional ceramic membranes, such as the sol-gel method and the co-precipitation method, have complex preparation processes and take a long time. The present method uses a hydrothermal method to prepare a ceramic membrane with a MoS2 functional layer in one step. The ceramic membrane and the functional layer are connected by chemical bonds such as covalent bonds, coordination bonds, and hydrogen bonds, so that the functional layer is tightly connected to the ceramic membrane and is not easily detached.

[0029] The ceramic membrane prepared by the present invention can be applied to the treatment of various wastewater containing organic pollutants, including printing and dyeing wastewater, pharmaceutical wastewater, papermaking wastewater, etc.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] (1) The ceramic membrane prepared by the method of the present invention has a MoS2 functional layer, which can achieve catalytic ozone oxidation. Compared with the traditional metal catalyst functional layer, the MoS2 functional layer presents a messy fragmented shape, has a larger specific surface area, and has a higher adsorption capacity for pollutants.

[0032] (2) The method for preparing a ceramic membrane having a MoS2 functional layer of the present invention has a large operating space and can adjust the pore size of the ceramic membrane.

[0033] (3) The ceramic membrane with the MoS2 functional layer prepared by the present invention is applied to water treatment and has good stability under a wide range of pH values, enabling it to work stably in different chemical environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a SEM image of the surface of the ceramic membrane with a MoS2 functional layer prepared in Example 1.

[0035] Figure 2 This is a SEM image of the surface of the ceramic membrane with a MoS2 functional layer prepared in Example 2.

[0036] Figure 3This is the XRD pattern of the surface of the ceramic membrane with MoS2 functional layer prepared in Example 1.

[0037] Figure 4 This is the EDS graph of Mo with a MoS2 functional layer prepared in Example 1.

[0038] Figure 5 This is the EDS graph of S with MoS2 functional layer prepared in Example 1. DETAILED DESCRIPTION

[0039] The present invention will be further described below in conjunction with specific embodiments.

[0040] The single-channel tubular ceramic membrane used in the following examples and comparative examples has a length of 60 mm, an inner diameter of 6 mm, a thickness of 2 mm, and a membrane pore diameter of 500 nm.

[0041] The flat ceramic membrane used has the specifications of 60 mm in length, 60 mm in width, 2 mm in thickness, and a membrane pore size of 500 nm.

[0042] The molecular weight of PVP is 111.

[0043] Example 1

[0044] The method for preparing the ceramic membrane having the MoS2 functional layer comprises the following steps:

[0045] 1) The single-channel tubular ceramic membrane was ultrasonically cleaned in deionized water for 30 min, then ultrasonically cleaned in ethanol for 1 h, and dried in an oven at 50 °C for 24 h;

[0046] 2) Disperse 1.6g ammonium molybdate, 1.44g thiourea and 4.4g PVP in 80mL of ionized water, stir at a constant temperature of 20℃ and a speed of 1200r / min to form a precursor solution;

[0047] 3) The single-channel tubular ceramic membrane treated in step 1) is sealed at both ends by a clamp, completely immersed in the precursor solution in step 2), sealed in a reactor, heated to 180°C in an oven for 18 hours, taken out and rinsed with deionized water, and placed in an oven at 60°C for 24 hours to form a ceramic membrane with a MoS2 functional layer.

[0048] The SEM image of the MoS2 functional layer of the ceramic membrane prepared in this embodiment is as follows: Figure 1 As shown by Figure 1It can be seen that the surface of the ceramic membrane is uneven with a large number of depressions. The grains on the surface of the ceramic membrane are spherical and surrounded by MoS2. The MoS2 is lamellar, with a size between 0.3 μm and 2 μm, evenly distributed, and clear edges of the lamellar sheets. This is related to the process in which the intermediate product MoO2 is first adsorbed on the substrate in the form of sheets during the growth process, and then reacts with sulfur vapor to generate MoS2 lamellar particles, and finally forms a continuous lamellar structure. The XRD pattern of the MoS2 functional layer of the ceramic membrane prepared in this embodiment is shown in FIG. Figure 3 As shown in the figure, the characteristic peaks of the MoS2 functional layer at 2θ=9.23° and 18.7° correspond to the (002) and (004) crystal planes of 1T-MoS2, respectively, proving the existence of 1T-MoS2. Due to the intercalation effect of PVP, MoS2 is transformed from 2H phase to 1T phase. The EDS graph of the MoS2 functional layer of the ceramic membrane prepared in this embodiment after hydrothermal treatment is shown in FIG. Figure 4 As shown in the figure, it can be seen that due to the dispersing effect of PVP, the molybdenum element is evenly distributed, which means that more reactive sites can be provided for the reaction; the EDS graph of sulfur in the MoS2 functional layer of the ceramic membrane prepared in this embodiment after hydrothermal treatment, as shown in Figure 5 As shown in the figure, it can be seen that the sulfur in the MoS2 functional layer is evenly distributed, and the amount is about twice that of molybdenum, which is consistent with the atomic ratio of MoS2. The uniform distribution of molybdenum and sulfur elements can absorb more ozone and pollutants, which helps to improve the catalytic ozone oxidation performance of the ceramic membrane.

[0049] Example 2

[0050] The method for preparing the ceramic membrane having a catalytic ozone oxidation functional layer comprises the following steps:

[0051] 1) The single-channel tubular ceramic membrane was ultrasonically cleaned in deionized water for 30 min, then ultrasonically cleaned in ethanol for 1 h, and dried in an oven at 80 °C for 16 h;

[0052] 2) Disperse 1.6g ammonium molybdate, 1.44g thiourea and 4.4g PVP in 240mL ionized water, mix, and stir at a constant temperature of 30°C and a speed of 600r / min to form a precursor solution;

[0053] 3) The single-channel tubular ceramic membrane treated in step 1) is sealed at both ends by a clamp, completely immersed in the precursor solution in step 2), sealed in a reactor, heated to 180°C in an oven for 18 hours, taken out and rinsed with deionized water, and placed in an oven at 60°C for 24 hours to form a ceramic membrane with a MoS2 functional layer.

[0054] The SEM image of the MoS2 functional layer of the ceramic membrane prepared in this embodiment is as follows: Figure 2 As shown by Figure 2It can be seen that the MoS2 on the surface of the ceramic membrane is in flaky form, similar to Example 1, but the amount of MoS2 is significantly less than that in Example 1. This proves that the content of the MoS2 functional layer can be controlled by adjusting the concentration of the molybdenum source and the sulfiding agent to adapt to the customization of ceramic membranes under different conditions.

[0055] Example 3

[0056] The method for preparing the ceramic membrane having the MoS2 functional layer comprises the following steps:

[0057] 1) The flat ceramic membrane was ultrasonically cleaned in deionized water for 0.5 h, then ultrasonically cleaned in ethanol for 1 h, and dried in an oven at 60 °C for 18 h;

[0058] 2) Disperse 1.64g sodium molybdate, 1.44g thiourea and 4.4g PVP in 80mL of ionized water, mix, and stir at a constant temperature of 40°C and a speed of 300r / min to form a precursor solution;

[0059] 3) The flat ceramic membrane treated in step 1) is completely immersed in the precursor solution in step 2), sealed in a reaction kettle, heated to 190°C in an oven for 18 hours, taken out and rinsed with deionized water, and dried in an oven at 60°C for 24 hours to form a ceramic membrane with a MoS2 functional layer.

[0060] Example 4

[0061] The method for preparing the ceramic membrane having the MoS2 functional layer comprises the following steps:

[0062] 1) The flat ceramic membrane was ultrasonically cleaned in deionized water for 0.5 h, then ultrasonically cleaned in ethanol for 1 h, and dried in an oven at 60 °C for 12 h;

[0063] 2) Disperse 1.6g of ammonium molybdate, 1.2g of thioacetamide, and 4.4g of PVP into 160mL of ionized water, and stir at a constant temperature of 30°C and a speed of 600r / min to form a precursor solution;

[0064] 3) The flat ceramic membrane treated in step 1) is completely immersed in the precursor solution of step 2), sealed in a reaction kettle, heated to 220°C in an oven for 12 hours, taken out and rinsed with deionized water, and dried in an oven at 60°C for 24 hours to form a ceramic membrane with a MoS2 functional layer.

[0065] Example 5

[0066] The method for preparing the ceramic membrane having the MoS2 functional layer comprises the following steps:

[0067] 1) The single-channel tubular flat ceramic membrane was ultrasonically cleaned in deionized water for 0.5 h, then ultrasonically cleaned in ethanol for 1 h, and dried in an oven at 60°C for 12 h;

[0068] 2) Disperse 1.6g ammonium molybdate, 1.44g thiourea and 4.4g PVP in 240mL ionized water, mix, and stir at a constant temperature of 30°C and a speed of 600r / min to form a precursor solution;

[0069] 3) The single-channel tubular ceramic membrane treated in step 1) is sealed at both ends by a clamp, completely immersed in the precursor solution in step 2), sealed in a reactor, heated to 240°C in an oven for 12 hours, taken out and rinsed with deionized water, and dried in an oven at 105°C for 12 hours to form a ceramic membrane with a MoS2 functional layer.

[0070] Example 6

[0071] The method for preparing the ceramic membrane having a catalytic ozone oxidation functional layer comprises the following steps:

[0072] 1) The single-channel tubular ceramic membrane was ultrasonically cleaned in deionized water for 0.5 h, then ultrasonically cleaned in ethanol for 1 h, and then placed in an oven at 60°C for 12 h;

[0073] 2) Disperse 1.6g of ammonium molybdate, 0.6g of sulfur powder, and 4.4g of PVP into 320mL of ionized water, and stir at a constant temperature of 30°C and a speed of 600r / min to form a precursor solution;

[0074] 3) The single-channel tubular ceramic membrane treated in step 1) is sealed at both ends by a clamp, completely immersed in the precursor solution in step 2), sealed in a reactor, heated to 180°C in an oven for 18 hours, taken out and rinsed with deionized water, and placed in an oven at 60°C for 24 hours to form a ceramic membrane with a MoS2 functional layer.

[0075] Example 7

[0076] The method for preparing the ceramic membrane having a catalytic ozone oxidation functional layer comprises the following steps:

[0077] 1) The single-channel tubular ceramic membrane was ultrasonically cleaned in deionized water for 0.5 h, then ultrasonically cleaned in ethanol for 1 h, and then placed in an oven at 60°C for 12 h;

[0078] 2) Disperse 1.6g ammonium molybdate, 1.44g thiourea and 4.4g PVP in 80mL ionized water, mix, and stir at a constant temperature of 30℃ and a speed of 600r / min to form a precursor solution;

[0079] 3) The single-channel tubular ceramic membrane treated in step 1) is sealed at both ends by a clamp, completely immersed in the precursor solution in step 2), sealed in a reactor, heated to 180°C in an oven for 24 hours, taken out and rinsed with deionized water, and dried in an oven at 50°C for 24 hours to form a ceramic membrane with a MoS2 functional layer.

[0080] Comparative Example 1

[0081] This comparative example is the same as Example 1, except that the amount of ammonium molybdate in step (2) is changed to 0.2 g, and the other preparations are exactly the same as those in Example 1.

[0082] Comparative Example 2

[0083] This comparative example is the same as Example 1, except that PVP is not added in step (2), and the other preparations are exactly the same as those in Example 1.

[0084] Comparative Example 3

[0085] This comparative example is the same as Example 1, except that the hydrothermal temperature in step (3) is changed to 120° C., and the other preparations are exactly the same as those in Example 1.

[0086] Comparative Example 4

[0087] This comparative example is the same as Example 1, except that the hydrothermal time in step (3) is changed to 36 h, and the other preparations are exactly the same as Example 1.

[0088] The test results of the ceramic membranes prepared in the above examples and comparative examples are shown in Table 1.

[0089] Table 1 Test results

[0090]

[0091] The ceramic membrane prepared in the above embodiments and comparative examples was applied: an ozone catalytic membrane reactor device was constructed, a ceramic membrane was loaded into the reactor to form a membrane assembly, ozone was introduced, and the separation and degradation performance of pollutants were tested. A 100 mg / L tetracycline hydrochloride solution was used as simulated wastewater, and the operation was carried out for 30 minutes. The removal rates of tetracycline hydrochloride and COD in the wastewater were determined and calculated, and after 5 cycles of performance tests, the removal rates of tetracycline hydrochloride and COD in the wastewater were determined and calculated. The test results are shown in Table 2. Tetracycline hydrochloride removal rate = (tetracycline hydrochloride content before degradation - tetracycline hydrochloride content after degradation) / tetracycline hydrochloride content before degradation × 100%; COD removal rate = (wastewater COD before degradation - wastewater COD after degradation) / wastewater COD before degradation × 100%.

[0092] Table 2 Application effect of ceramic membrane

[0093]

[0094] From the above, it can be seen that: (1) The post-loading effect of the molybdenum source at a concentration lower than that of the present invention is poor, resulting in a larger pore size of the ceramic membrane, a small specific surface area, poor adsorption effect, fewer reaction active sites, and poor catalytic effect; (2) By prolonging the time of the hydrothermal reaction, the MoS2 functional layer loaded on the surface of the ceramic membrane can obtain a larger specific surface area, but it will lead to a decrease in the cycle performance, which is related to the weakening of the bond between the MoS2 ceramic membrane due to long-term hydrothermal treatment; (3) By controlling the type of molybdenum source and sulfur source and the length of hydrothermal treatment, a ceramic membrane with excellent catalytic performance and cycle performance can be prepared.

[0095] The catalytic effect and stability of Example 1 at different pH values ​​were tested: an ozone catalytic membrane reactor device was constructed, a ceramic membrane was loaded into the reactor to form a membrane assembly, ozone was introduced, and the pollutant separation and degradation performance tests were performed. A 100 mg / L tetracycline hydrochloride solution was used as simulated wastewater, 0.1 mol / L sulfuric acid solution and 0.1 mol / L sodium hydroxide solution were added to the tetracycline hydrochloride solution, and the pH value of the solution was adjusted to: 1.5, 3.5, 5.5, 9.5, 11.5, 13.5, and the solution was run for 30 minutes. The removal rates of tetracycline hydrochloride and COD in the wastewater were determined and calculated, and after 5 cycles of performance tests, the removal rates of tetracycline hydrochloride and COD in the wastewater were determined and calculated.

[0096] Table 3 Catalytic effect and stability of ceramic membrane at different pH values

[0097]

[0098] It can be seen from the above table that (1) the ceramic membrane still has a high catalytic activity regardless of whether it is under acidic or alkaline conditions; (2) after 5 cycles, the ceramic membrane still has a stable catalytic function, proving that the ceramic membrane is stable under a wide range of pH values ​​and is suitable for different water quality environments.

[0099] The ceramic membrane with MoS2 functional layer prepared by a one-step hydrothermal reaction showed excellent results in the experiment of catalytic ozone removal of tetracycline hydrochloride in water. The MoS2 functional layer ceramic membrane prepared by this method has the characteristics of simple preparation, controllable performance, outstanding catalytic performance, excellent cycle performance, good stability, and suitability for a wide range of pH environments.

Claims

1. Application of a ceramic membrane having a MoS2 functional layer, characterized in that: It is applied to the ozone catalytic membrane reactor device to treat wastewater. MoS2 is evenly loaded on the surface of the ceramic membrane and on the pore wall. The MoS2 functional layer presents a messy fragmented shape. The MoS2 functional layer realizes catalytic ozone oxidation. The ceramic membrane with MoS2 functional layer is prepared according to the following method: 1) First, ultrasonically clean the ceramic membrane in water, then in ethanol, and dry it; 2) Disperse the molybdenum source, the vulcanizing agent and the polyvinyl pyrrolidone in water, mix them, and stir them evenly at a constant temperature to form a precursor solution; the concentration of the molybdenum source is 0.02-0.10 mol / L; the concentration of the polyvinyl pyrrolidone is 0.12-0.50 mol / L; 3) completely immersing the ceramic membrane treated in step 1) into the precursor solution in step 2), sealing it in a reaction kettle for hydrothermal reaction, taking it out, rinsing it, and drying it to obtain a ceramic membrane with a MoS2 functional layer; the hydrothermal reaction temperature is 180-240°C, and the hydrothermal reaction time is 12-24h; The molybdenum source is one of ammonium molybdate and sodium molybdate; The vulcanizing agent is one of thiourea, thioacetamide and sulfur powder; In the above method, the pore size of the ceramic membrane and the amount of MoS2 loaded are adjusted by the number of hydrothermal methods, and MoS2 is converted from 2H phase to 1T phase through the intercalation effect of polyvinyl pyrrolidone.

2. The use of the ceramic membrane with MoS2 functional layer according to claim 1, characterized in that: The ceramic membrane is an alumina flat ceramic membrane or a tubular ceramic membrane.

3. The use of the ceramic membrane with MoS2 functional layer according to claim 1, characterized in that: In step 1), the ultrasonic cleaning time in water is 10-60 minutes, the ultrasonic cleaning time in ethanol is 0.5-2 hours, the drying temperature is 50-105° C., and the drying time is 12-24 hours.

4. The use of the ceramic membrane with MoS2 functional layer according to claim 1, characterized in that: In step 2), the constant temperature stirring temperature is 20-40°C, and the constant temperature stirring speed is 300-1200r / min.

5. The use of the ceramic membrane with MoS2 functional layer according to claim 1, characterized in that: In step 2), the concentration of the sulfiding agent is 0.06-0.24 mol / L.

6. The use of the ceramic membrane with MoS2 functional layer according to claim 1, characterized in that: In step 3), the drying temperature is 50-105°C and the drying time is 12-24h.

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