A molybdenum disulfide-based adsorbent material and its preparation method

Abstract

The present invention belongs to the technical field of preparation of adsorption materials, and provides an adsorption material based on molybdenum disulfide and a preparation method thereof, which comprises the following steps: S1. Ammonium molybdate tetrahydrate and thiourea are mixed and subjected to hydrothermal reaction to prepare nano-molybdenum disulfide; S2. The nano-molybdenum disulfide, cerium nitrate hexahydrate and deionized water are mixed, ultrasonically dispersed for 5-10 min, hydrochloric acid is added, heated and reacted, cooled, washed and dried to obtain CeO2 / MoS2 composite nano-materials; S3. The CeO2 / MoS2 composite nano-materials are mixed with a modification solution of 1-2 mg / mL, heated and ultrasonically treated, centrifuged, washed and dried to obtain modified CeO2 / MoS2 composite nano-materials; S4. The modified CeO2 / MoS2 composite nano-materials are dispersed in deionized water, a surfactant is added, ultrasonically dispersed, modified graphene is added, ultrasonically dispersed, and then a reducing agent is added, and hydrothermal reaction, washing and drying are carried out to obtain the adsorption material. The adsorption material of the present invention has high adsorption capacity, high selectivity and high stability, and thus has good market prospects.

Description

Technical Field

[0001] The present invention belongs to the technical field of preparation of adsorption materials, and specifically relates to an adsorption material based on molybdenum disulfide and a preparation method thereof. Background Art

[0002] Molybdenum disulfide is a nanomaterial with a special layered structure. Due to its unique physical and chemical properties, it exhibits broad application potential in multiple fields. In the field of artificial kidney technology, the adsorption performance of molybdenum disulfide has attracted particular attention, mainly due to its large specific surface area and rich active sites on the edges.

[0003] In the application of artificial kidneys, molybdenum disulfide can be used as an efficient adsorption material to remove toxins and waste in the blood. At the same time, by adjusting the synthesis conditions of molybdenum disulfide, such as the molar ratio of reactants, reaction time, and temperature, its morphology and structure can be optimized, thereby improving its adsorption performance. In the design of artificial kidneys, wearable dialysis machines and bioartificial kidneys are two main research directions. Wearable dialysis machines need to solve the problem of dialysis fluid regeneration, and molybdenum disulfide plays an important role in this, helping to improve adsorption efficiency and selectivity. In addition, the optoelectronic properties and catalytic degradation properties of molybdenum disulfide may also play a role in the biosensors and photocatalytic systems of artificial kidneys. However, applying molybdenum disulfide to artificial kidney technology still faces challenges, including how to improve its adsorption performance and enhance its stability.

[0004] Chinese Patent CN 115554975 B discloses an adsorption material, its preparation method and application. The adsorption material is a cerium dioxide modified flower-like molybdenum disulfide composite material, which is prepared by a hydrothermal method and can be used as an efficient adsorbent for uremic toxins. Compared with activated carbon and MoS2, the present invention solves the technical problem that the adsorption performance, selectivity, and stability of the adsorption material in the dialysis fluid purification device of a wearable artificial kidney in the prior art still need to be further improved, and has high adsorption performance; however, this adsorption material may have cytotoxicity and is not conducive to long-term use.

[0005] Therefore, there is an urgent need to develop an adsorption material based on molybdenum disulfide with excellent adsorption performance. Summary of the Invention

[0006] Aiming at the existing technical problems, the purpose of the present invention is to provide an adsorption material based on molybdenum disulfide and a preparation method thereof. The adsorption material of the present invention has high adsorption, high selectivity, and high stability, and thus has a good market prospect.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0008] On the one hand, the present invention provides a preparation method of an adsorption material based on molybdenum disulfide, comprising the following steps:

[0009] S1. Mix ammonium molybdate tetrahydrate and thiourea, and carry out a hydrothermal reaction to prepare nanometer molybdenum disulfide.

[0010] S2. Mix the nanometer molybdenum disulfide obtained in step S1, cerium nitrate hexahydrate, and deionized water, ultrasonically disperse for 5 - 10 min, add hydrochloric acid, heat to 90 - 100 °C, stir and react for 10 - 25 min, cool, wash, and dry to obtain CeO2 / MoS2 composite nanomaterials.

[0011] S3. Mix the CeO2 / MoS2 composite nanomaterials obtained in step S2 with a modification solution of 1 - 2 mg / mL, heat and ultrasonicate, then add deionized water, centrifuge once, take the precipitate for washing, disperse it with deionized water again, centrifuge twice, take the supernatant, and dry to obtain modified CeO2 / MoS2 composite nanomaterials.

[0012] S4. Disperse the modified CeO2 / MoS2 composite nanomaterials obtained in step S3 in deionized water, add a surfactant, ultrasonically disperse, add modified graphene, ultrasonically disperse, then add a reducing agent, carry out a hydrothermal reaction, wash, and dry to obtain an adsorption material.

[0013] The reaction mechanism and function of the present invention are as follows:

[0014] 1. In the present invention, ammonium molybdate and thiourea are used as reactants, and hydrothermal method is used to prepare nanometer molybdenum disulfide. During the formation of nanometer molybdenum disulfide, excessive thiourea will adsorb on the surface of the initially formed MoS2 nanocrystals, hindering crystal growth and resulting in more active sites on the surface of nanometer MoS2. Furthermore, the applicant combines nanometer molybdenum disulfide and cerium nitrate hexahydrate by ultrasonic to form CeO2 / MoS2 composite nanomaterials; then, a modification solution of mercapto substance (6 - amino - 1 - mercaptohexane hydrochloride aqueous solution) is modified on the active sites, which is more conducive to its functional modification and improves biocompatibility. Further, in the present invention, graphene and chloroacetic acid are used as reactants, and modified graphene is prepared under alkaline conditions. It can not only modify itself onto the surface of CeO2 / MoS2 composite nanomaterials through amidation reaction, but also the cationic surfactant will generate charge attraction with the negative charges on the surface of modified graphene, making graphene and CeO2 / MoS2 composite nanomaterials better combined, improving stability, and finally preparing an adsorption material of graphene / CeO2 / MoS2 composite.

[0015] The adsorption material of the present invention has no obvious agglomeration phenomenon after standing for a long time in different temperature environments and has good stability. In addition, through the modification of molybdenum disulfide in the present invention, the total specific surface area is increased, the number of adsorption sites is increased, and the adsorption rate and adsorption capacity of the adsorption material for uremic toxins are improved.

[0016] In some embodiments, the specific steps of step S1 are as follows:

[0017] Add ammonium molybdate tetrahydrate, thiourea, and deionized water into a reaction kettle, ultrasonicate at 100 - 200 W for 20 - 45 min, heat to 180 - 210 °C, react for 16 - 24 h, cool, centrifuge once, take the precipitate, wash it with deionized water 3 - 4 times, then disperse it with deionized water, centrifuge twice, take the supernatant, and dry it to obtain nano-molybdenum disulfide.

[0018] In some embodiments, the mass ratio of ammonium molybdate tetrahydrate to thiourea in step S1 is 1:(2 - 2.2).

[0019] In some embodiments, the mass ratio of the nano-molybdenum disulfide to cerium nitrate hexahydrate in step S2 is (2.4 - 3):1.

[0020] In some embodiments, the modification liquid in step S3 is an aqueous solution of 6-amino-1-mercaptohexane hydrochloride.

[0021] In some embodiments, the dosage ratio of the CeO2 / MoS2 composite nanomaterial to the modification liquid in step S3 is 1 g:(600 - 800) ml.

[0022] In some embodiments, the parameters of the first centrifugation in step S3 are centrifugation at 10000 - 15000 rpm for 20 - 40 min, and the parameters of the second centrifugation are centrifugation at 3500 - 6000 rpm for 10 - 20 min.

[0023] In some embodiments, the conditions of heating and ultrasonication in step S3 are: heating temperature 30 - 40 °C, and ultrasonic power 100 - 200 W.

[0024] In some embodiments, the mass ratio of the modified CeO2 / MoS2 composite nanomaterial to the modified graphene in step S4 is (45 - 55):1.

[0025] In some embodiments, the surfactant in step S4 is a cationic surfactant.

[0026] Preferably, the cationic surfactant is any one or more of dodecyl trimethyl ammonium bromide, cetyl trimethyl ammonium bromide, and didodecyl dimethyl ammonium bromide.

[0027] In some embodiments, the preparation method of the modified graphene in step S4 includes the following steps:

[0028] Mix graphene oxide and deionized water, disperse them by ultrasonic wave, then add chloroacetic acid and sodium hydroxide, ultrasonicate, stir for 10 - 16 h, centrifuge, wash, dry and grind to obtain modified graphene.

[0029] In some embodiments, the mass ratio of the graphene oxide, chloroacetic acid and sodium hydroxide is 1:(2.2 - 2.6):(3 - 3.8).

[0030] On the other hand, the present invention provides an adsorbent material based on molybdenum disulfide obtained by the preparation method described above.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] 1. The adsorbent material of the present invention has high adsorption, high selectivity and high stability, and thus has a good market prospect.

[0033] 2. By modifying molybdenum disulfide, the present invention increases the total specific surface area, the number of adsorption sites increases, and the adsorption performance of the adsorbent material for uremic toxins is improved.

[0034] 3. The modified graphene of the present invention can not only modify itself onto the surface of the CeO2 / MoS2 composite nanomaterial through an amidation reaction, but also the cationic surfactant will generate charge attraction with the negative charges on the surface of the modified graphene, enabling better combination of graphene and the CeO2 / MoS2 composite nanomaterial, improving stability, and further enhancing the adsorption performance. Specific Embodiments

[0035] The following will illustrate the present invention in conjunction with specific implementation schemes. It should be noted that the following examples are examples of the present invention, only used to illustrate the present invention, rather than to limit the present invention. Other combinations and various improvements within the concept of the present invention can be made without departing from the main idea or scope of the present invention.

[0036] Fabricate each adsorbent material according to the proportion of each raw material and the production method specified in the following examples and comparative examples.

[0037] For the convenience of those skilled in the art to implement the present invention, the manufacturers of some raw materials in the examples and comparative examples are described as follows:

[0038] There is no special limitation on the raw materials used, and they can all be purchased from the market.

[0039] Preparation Example 1

[0040] The preparation method of modified graphene A includes the following steps:

[0041] Mix 1 g of graphene oxide with 100 ml of deionized water, disperse it by ultrasonic wave at 100 W for 30 min, then add 2.4 g of chloroacetic acid and 3.6 g of sodium hydroxide, ultrasonic wave at 200 W for 45 min, stir for 16 h, centrifuge, wash with deionized water until neutral, freeze-dry at -30 °C for 12 h, and grind to obtain modified graphene A.

[0042] Preparation Example 2

[0043] The preparation method of modified graphene B is the same as that of Preparation Example 1, except that the addition amount of chloroacetic acid is 2.2 g.

[0044] Preparation Example 3

[0045] The preparation method of modified graphene C is the same as that of Preparation Example 1, except that the addition amount of sodium hydroxide is 2.8 g.

[0046] Example 1

[0047] A preparation method of an adsorption material based on molybdenum disulfide, comprising the following steps:

[0048] S1. Add 1.5 g of ammonium molybdate tetrahydrate, 3.15 g of thiourea, and 50 ml of deionized water to a reaction kettle, ultrasonic wave at 150 W for 35 min, heat to 200 °C, react for 20 h, cool to room temperature, centrifuge at 12000 rpm for 30 min, take the precipitate, wash it 4 times with deionized water, then disperse it with deionized water, centrifuge at 4500 rpm for 15 min, take the supernatant, and dry it at 60 °C for 48 h to obtain nano-molybdenum disulfide;

[0049] S2. Mix 1 g of the nano-molybdenum disulfide obtained in step S1, 0.37 g of cerium nitrate hexahydrate, and 200 ml of deionized water, disperse it by ultrasonic wave for 8 min, add 5 ml of 0.12 mol / L hydrochloric acid, heat to 95 °C, stir and react for 15 min, cool to room temperature, wash it 3 times with absolute ethanol, then wash it 3 times with deionized water, and dry it at 60 °C for 16 h to obtain CeO2 / MoS2 composite nano-material;

[0050] S3. Mix 1 g of the CeO2 / MoS2 composite nano-material obtained in step S2 with 700 ml of 1.5 mg / mL 6-amino-1-mercaptohexane hydrochloride aqueous solution, heat to 35 °C, ultrasonic wave at 150 W for 20 min, then add 500 ml of deionized water, centrifuge at 12000 rpm for 30 min, take the precipitate, wash it 4 times with deionized water, then disperse it with 300 ml of deionized water, centrifuge at 4500 rpm for 15 min, take the supernatant, and dry it at 60 °C for 24 h to obtain modified CeO2 / MoS2 composite nano-material;

[0051] S4. Disperse 0.5 g of the modified CeO2 / MoS2 composite nanomaterial obtained in step S3 in 100 ml of deionized water, add 50 mg of dodecyltrimethylammonium bromide, ultrasonically disperse for 20 min at 200 W, add 10 mg of modified graphene A, ultrasonically disperse for 40 min at 500 W, then add 0.2 g of thiourea, heat to 180 °C, stir and react for 6 h, cool to room temperature, wash 4 times with deionized water, and dry to constant weight at a vacuum of 1.0 Pa and a temperature of -40 °C to obtain the adsorption material.

[0052] Example 2

[0053] A preparation method of a molybdenum disulfide-based adsorption material, comprising the following steps:

[0054] S1. Add 1.5 g of ammonium molybdate tetrahydrate, 3 g of thiourea, and 50 ml of deionized water to a reaction kettle, ultrasonically disperse for 20 min at 200 W, heat to 210 °C, react for 16 h, cool to room temperature, centrifuge at 10000 rpm for 40 min, take the precipitate, wash 4 times with deionized water, then disperse with deionized water, centrifuge at 3500 rpm for 20 min, take the supernatant, and dry at 60 °C for 24 h to obtain nanomolybdenum disulfide;

[0055] S2. Mix 1 g of the nanomolybdenum disulfide obtained in step S1, 0.33 g of cerium nitrate hexahydrate, and 200 ml of deionized water, ultrasonically disperse for 5 min, add 5 ml of 0.12 mol / L hydrochloric acid, heat to 90 °C, stir and react for 25 min, cool to room temperature, wash 3 times with absolute ethanol, then wash 3 times with deionized water, and dry at 60 °C for 16 h to obtain the CeO2 / MoS2 composite nanomaterial;

[0056] S3. Mix 1 g of the CeO2 / MoS2 composite nanomaterial obtained in step S2 with 600 ml of a 2 mg / mL aqueous solution of 6-amino-1-mercaptohexane hydrochloride, heat to 30 °C, ultrasonically disperse for 20 min at 100 W, then add 500 ml of deionized water, centrifuge at 10000 rpm for 40 min, take the precipitate, wash 4 times with deionized water, then disperse with 300 ml of deionized water, centrifuge at 3500 rpm for 20 min, take the supernatant, and dry at 60 °C for 24 h to obtain the modified CeO2 / MoS2 composite nanomaterial;

[0057] S4. Disperse 0.45 g of the modified CeO2 / MoS2 composite nanomaterial obtained in step S3 in 100 ml of deionized water, add 50 mg of dodecyltrimethylammonium bromide, ultrasonically disperse for 20 min at 200 W, add 10 mg of modified graphene A, ultrasonically disperse for 40 min at 500 W, then add 0.2 g of thiourea, heat to 180 °C, stir and react for 6 h, cool to room temperature, wash 4 times with deionized water, and dry to constant weight at a vacuum degree of 1.0 Pa and a temperature of -40 °C to obtain the adsorption material.

[0058] Example 3

[0059] A preparation method of an adsorption material based on molybdenum disulfide, comprising the following steps:

[0060] S1. Add 1.5 g of ammonium molybdate tetrahydrate, 3.3 g of thiourea, and 50 ml of deionized water to a reaction kettle, ultrasonically disperse at 100 W for 45 min, heat to 180 °C, react for 24 h, cool to room temperature, centrifuge at 15000 rpm for 20 min, take the precipitate, wash 4 times with deionized water, then disperse with deionized water, centrifuge at 6000 rpm for 10 min, take the supernatant, and dry at 60 °C for 24 h to obtain nanomolybdenum disulfide;

[0061] S2. Mix 1 g of the nanomolybdenum disulfide obtained in step S1, 0.41 g of cerium nitrate hexahydrate, and 200 ml of deionized water, ultrasonically disperse for 10 min, add 5 ml of 0.12 mol / L hydrochloric acid, heat to 100 °C, stir and react for 10 min, cool to room temperature, wash 3 times with absolute ethanol, then wash 3 times with deionized water, and dry at 60 °C for 16 h to obtain the CeO2 / MoS2 composite nanomaterial;

[0062] S3. Mix 1 g of the CeO2 / MoS2 composite nanomaterial obtained in step S2 with 700 ml of a 1.5 mg / mL aqueous solution of 6-amino-1-mercaptohexane hydrochloride, heat to 35 °C, ultrasonically disperse at 150 W for 20 min, then add 500 ml of deionized water, centrifuge at 15000 rpm for 20 min, take the precipitate, wash 4 times with deionized water, then disperse with 300 ml of deionized water, centrifuge at 6000 rpm for 10 min, take the supernatant, and dry at 60 °C for 24 h to obtain the modified CeO2 / MoS2 composite nanomaterial;

[0063] S4. Disperse 0.55 g of the modified CeO2 / MoS2 composite nanomaterial obtained in step S3 in 100 ml of deionized water, add 50 mg of dodecyltrimethylammonium bromide, ultrasonically disperse for 20 min at 200 W, add 10 mg of modified graphene A, ultrasonically disperse for 40 min at 500 W, then add 0.2 g of thiourea, heat to 180 °C, stir and react for 6 h, cool to room temperature, wash 4 times with deionized water, and dry to constant weight at a vacuum degree of 1.0 Pa and a temperature of -40 °C to obtain the adsorption material.

[0064] Example 4

[0065] A preparation method of a molybdenum disulfide-based adsorption material is the same as that in Example 1, except that an equal amount of modified graphene B is used to replace modified graphene A.

[0066] Example 5

[0067] A preparation method of a molybdenum disulfide-based adsorption material is the same as that in Example 1, except that an equal amount of modified graphene C is used to replace modified graphene A.

[0068] Example 6

[0069] A preparation method of a molybdenum disulfide-based adsorption material is the same as that in Example 1, except that the addition amount of 6-amino-1-mercaptohexane hydrochloride aqueous solution in step S3 is 570 ml.

[0070] Example 7

[0071] A preparation method of a molybdenum disulfide-based adsorption material is the same as that in Example 1, except that the addition amount of modified graphene A in step S4 is 8.6 mg.

[0072] Example 8

[0073] A preparation method of a molybdenum disulfide-based adsorption material is the same as that in Example 1, except that the addition amount of thiourea in step S1 is 2.7 g.

[0074] Example 9

[0075] A preparation method of a molybdenum disulfide-based adsorption material is the same as that in Example 1, except that the addition amount of cerium nitrate hexahydrate in step S2 is 0.46 g.

[0076] Comparative Example 1

[0077] A preparation method of a molybdenum disulfide-based adsorption material is the same as that in Example 1, except that an equal amount of commercially available graphene oxide is used to replace modified graphene A.

[0078] Comparative Example 2

[0079] A preparation method of a molybdenum disulfide-based adsorption material comprises the following steps:

[0080] S1. Add 1.5 g of ammonium molybdate tetrahydrate, 3.3 g of thiourea, and 50 ml of deionized water into a reaction kettle, ultrasonicate for 45 min at 100 W, heat to 180 °C, react for 24 h, cool to room temperature, centrifuge at 15000 rpm for 20 min, take the precipitate, wash it 4 times with deionized water, then disperse it with deionized water, centrifuge at 6000 rpm for 10 min, take the supernatant, and dry it at 60 °C for 24 h to obtain nanometer molybdenum disulfide;

[0081] S2. Mix 1 g of the nanometer molybdenum disulfide obtained in step S1, 0.41 g of cerium nitrate hexahydrate, and 200 ml of deionized water, ultrasonically disperse for 10 min, add 5 ml of 0.12 mol / L hydrochloric acid, heat to 100 °C, stir and react for 10 min, cool to room temperature, wash it 3 times with absolute ethanol, then wash it 3 times with deionized water, and dry it at 60 °C for 16 h to obtain the CeO2 / MoS2 composite nanomaterial, which is the adsorption material.

[0082] Effect evaluation:

[0083] Test and analyze the adsorption materials prepared in the above Examples 1-9 and Comparative Examples 1-2. The specific results are shown in Table 1.

[0084] Performance test:

[0085] Determination of urea adsorption performance: Take 0.1 g of the adsorption material to adsorb 20 ml of urea solution (the mass concentration of the urea solution is 300 mg / L), and measure the urea concentration in the solution after 2 h at 37 °C.

[0086] Determination of creatinine adsorption performance: Take 0.1 g of the adsorption material to adsorb 50 ml of creatinine solution (the mass concentration of the creatinine solution is 200 mg / L), and measure the creatinine concentration in the solution after 2 h at 37 °C.

[0087] Table 1

[0088] Serial number Urea adsorption capacity (mg / g) Creatinine adsorption capacity (mg / g) Example 1 82.2 88.7 Example 2 80.3 87.9 Example 3 81.8 89.0 Example 4 73.1 78.4 Example 5 75.9 79.7 Example 6 72.7 77.2 Example 7 70.5 75.6 Example 8 72.9 76.5 Example 9 74.2 79.6 Comparative Example 1 62.6 69.5 Comparative Example 2 52.1 59.2

[0089] From the results in Table 1, it can be seen that the urea adsorption capacity and creatinine adsorption capacity of the adsorption materials prepared in Examples 1-3 are relatively high.

[0090] In Examples 4-5 and Comparative Example 1 compared with Example 1, when preparing modified graphene, in Examples 4-5, the mass ratio of graphene oxide, chloroacetic acid, and sodium hydroxide was changed, making it difficult for the modified graphene to effectively bind to the surface of the modified CeO2 / MoS2 composite nanomaterial, thereby deteriorating the stability of the adsorption material; in Comparative Example 1, an equal amount of commercially available graphene oxide was used to replace modified graphene A, and it was difficult for the graphene oxide to effectively bind to the modified CeO2 / MoS2 composite nanomaterial, both of which would reduce the adsorption capacity of the adsorption material.

[0091] Examples 6-9 compared with Example 1. When preparing the modified adsorption material, in Example 6, the dosage ratio of the CeO2 / MoS2 composite nanomaterial and the 1-2 mg / mL modification solution was changed, and the grafted amino groups were reduced; in Example 7, the mass ratio of the modified CeO2 / MoS2 composite nanomaterial and the modified graphene was changed, reducing the binding effect between the two; in Example 8, the mass ratio of ammonium molybdate tetrahydrate and thiourea was changed, resulting in partial crystal growth and a reduction in active sites; in Example 9, the mass ratio of molybdenum disulfide nanometer and cerium nitrate hexahydrate was changed, reducing the surface active sites and the synergistic effect, thereby reducing the adsorption capacity of the adsorption material.

[0092] Comparative Example 2 compared with Example 1. Only CeO2 and MoS2 were combined, and graphene was not introduced, greatly reducing the adsorption capacity of the adsorption material.

[0093] As mentioned above, it is only a preferred embodiment of the present invention, and does not impose any form of limitation on this application. Although this application is disclosed with preferred embodiments as above, it is not intended to limit this application. Any person skilled in the art, without departing from the scope of the technical solution of this application, making some changes or modifications using the disclosed technical content above is equivalent to equivalent implementation cases. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution.

Claims

1. A preparation method of a molybdenum disulfide-based adsorption material, characterized in that, It includes the following steps: S1. Ammonium molybdate tetrahydrate and thiourea are mixed and subjected to hydrothermal reaction to prepare nano-molybdenum disulfide; S2. The nano-molybdenum disulfide obtained in step S1, cerium nitrate hexahydrate, and deionized water are mixed, ultrasonically dispersed for 5 - 10 min, hydrochloric acid is added, heated to 90 - 100 °C, stirred and reacted for 10 - 25 min, cooled, washed, and dried to obtain CeO2 / MoS2 composite nano-material; S3. The CeO2 / MoS2 composite nano-material obtained in step S2 is mixed with a 1 - 2 mg / mL modification solution, heated and ultrasonically treated, then deionized water is added, centrifuged once, the precipitate is taken and washed, then dispersed with deionized water, centrifuged twice, the supernatant is taken and dried to obtain a modified CeO2 / MoS2 composite nano-material; the modification solution is an aqueous solution of 6-amino-1-mercaptohexane hydrochloride; S4. The modified CeO2 / MoS2 composite nano-material obtained in step S3 is dispersed in deionized water, a surfactant is added, ultrasonically dispersed, modified graphene is added, ultrasonically dispersed, then a reducing agent is added, subjected to hydrothermal reaction, washed, and dried to obtain an adsorption material; The preparation method of the modified graphene includes the following steps: Graphene oxide and deionized water are mixed, ultrasonically dispersed, then chloroacetic acid and sodium hydroxide are added, ultrasonically treated, stirred for 10 - 16 h, centrifuged and washed, dried, and ground to obtain modified graphene.

2. The preparation method of an adsorption material based on molybdenum disulfide according to claim 1, wherein In step S1, the mass ratio of ammonium molybdate tetrahydrate to thiourea is 1:(2 - 2.2).

3. The preparation method of an adsorption material based on molybdenum disulfide according to claim 1, characterized in that, In step S2, the mass ratio of nano-molybdenum disulfide to cerium nitrate hexahydrate is (2.4 - 3):

1.

4. The preparation method of an adsorption material based on molybdenum disulfide according to claim 1, characterized in that, In step S3, the dosage ratio of the CeO2 / MoS2 composite nano-material to the modification solution is 1 g:(600 - 800) ml.

5. The preparation method of an adsorption material based on molybdenum disulfide according to claim 1, wherein, In step S3, the parameters of the first centrifugation are centrifugation at 10000 - 15000 rpm for 20 - 40 min, and the parameters of the second centrifugation are centrifugation at 3500 - 6000 rpm for 10 - 20 min.

6. The preparation method of an adsorption material based on molybdenum disulfide according to claim 1, characterized in that, In step S4, the mass ratio of the modified CeO2 / MoS2 composite nano-material to the modified graphene is (45 - 55):

1.

7. The preparation method of an adsorption material based on molybdenum disulfide according to claim 1, characterized in that, The mass ratio of graphene oxide, chloroacetic acid, and sodium hydroxide is 1:(2.2 - 2.6):(3 - 3.8).

8. An adsorption material based on molybdenum disulfide obtained by the preparation method according to any one of claims 1 - 7.