Synthesis method and application of Ag-coated silver molybdate / cellulose paper triple hybrid skeleton

Abstract

The invention discloses a synthesis method of an Ag-coated silver molybdate / cellulose paper triple hybrid skeleton, which comprises the following steps: S1, respectively preparing silver nitrate and ammonium molybdate tetrahydrate into aqueous solutions, and ultrasonically mixing the silver nitrate and the ammonium molybdate tetrahydrate to obtain a precursor; s2, adjusting the pH value of the precursor to about 2 by using dilute nitric acid, putting cellulose paper, and reacting in a high-pressure reaction kettle to obtain a cellulose paper / silver molybdate composite material; after filtering, washing with deionized water for 3-5 times, and drying in vacuum at low temperature; and S3, irradiating the silver molybdate / cellulose paper composite material with ultraviolet light to obtain the Ag-coated silver molybdate / cellulose paper composite material. According to the synthesis method, the preparation process is simplified, the selective adsorbability of the material is highlighted, and the application of the material in the fields of filtration, adsorption treatment of industrial wastewater and the like is expanded. In the growth process of the material, the nanowires are induced to uniformly grow on the surfaces of the fibers under the action of hydrogen bonds between the fibers and the nanowires to form a unique core-shell structure, and the growth of silver molybdate endows the fiber cloth with specific recognition and capture effects on sulfur-containing molecules.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of composite materials, in particular to a synthesis method of an Ag@ silver molybdate / fiber paper triple hybrid framework and application thereof. BACKGROUND

[0002] Separation process is a key unit operation in chemical production, and its cost can account for more than 70% of the total production cost. New membrane separation technology has the advantages of low energy consumption, high efficiency, simple operation, production safety, less equipment investment and land occupation, and plays an increasingly important role in the chemical industry. However, traditional separation membranes generally cannot simultaneously achieve high permeability and selectivity, and how to break through the upper limit of separation performance is an important problem to be overcome in the field of membrane separation. The present patent technology is inspired by the transpiration and capillary water transport processes in nature, and is dedicated to the design and development of advanced molecular separation systems with capillary water transport network structure, molecular separation function and continuous non-energy consumption working characteristics. Metal molybdate is an important inorganic material, which has broad application prospects in many fields such as photoluminescence, optical fiber and catalyst. Among them, one-dimensional (1D) metal molybdate is widely used, for example, silver molybdate nanowires (Ag2Mo3O 10 ·1.8H2O) become ideal materials for preparing selective separation membranes due to their simple preparation process and excellent selective adsorption capacity for sulfur dyes. Cellulose paper is derived from abundant and renewable natural polymers, and its three-dimensional interconnected porous network structure and high specific surface area make it an ideal porous carrier, which helps to achieve high loading capacity.

[0003] In addition, the structure of the biomimetic material needs to be optimized. For example, Karnik et al. used carbon nanotubes to simulate plant root systems and prepared a carbon nanotube porous membrane similar to the network structure of plant root systems. Based on the porous membrane, a water purification system with super adsorption capacity and interception capacity was assembled, realizing seawater desalination and sewage purification. Darren Delai Sun's research group at the Nanyang Technological University of Singapore has done a lot of work in the field of water purification using nanoparticles to simulate sand. They respectively used TiO2 nanowire microspheres, graphene-TiO2 composite microspheres and mesoporous ZnO hemispheres to simulate the sand filtration process, and all achieved good water purification effect. Ajayan's research group wrapped graphene oxide on the surface of sand to mass-produce water purification materials with super adsorption capacity and interception capacity, achieving efficient purification of organic wastewater and heavy metal wastewater. However, the plant root system embedded sand model in nature has three levels of structure: main roots, fibrous roots and sand, while the above-mentioned literature in experimental research generally uses one or two structural materials (fiber, fiber + fiber, fiber + particle) to simulate the model. SUMMARY

[0004] In view of the deficiencies of the prior art, the purpose of the present application is to provide a synthesis method of Ag@ silver molybdate / fiber paper triple hybrid framework and its application in water purification. Silver molybdate is grown on the fiber paper, and then Ag@ silver molybdate / fiber paper hybrid framework is generated after ultraviolet light irradiation. The fiber paper and silver molybdate are assembled into a three-dimensional interpenetrating channel structure, and Ag@ silver molybdate / fiber paper hybrid framework has many micro / nano channels between its adjacent one-dimensional building blocks, which can be used as an effective water transport network driven by capillary force, providing a new idea for the design of high-efficiency molecular separation materials and the research and development of separation technology, and expanding its application in the fields of filtering and adsorbing industrial wastewater treatment. During the growth of the material, the hydrogen bond interaction between the fibers and nanowires induces the uniform growth of the nanowires on the surface of the fibers, forming a unique core-shell structure, and the growth of silver molybdate endows the fiber cloth with specific recognition and capture effect of sulfur-containing molecules.

[0005] The technical scheme adopted by the present application to solve the technical problems is: a synthesis method of Ag@ silver molybdate / fiber paper triple hybrid framework, the synthesis method comprising the following steps: S1, synthesis of precursor: silver nitrate is added to water to prepare a silver nitrate solution, and ammonium molybdate tetrahydrate is dissolved in water to prepare an ammonium molybdate solution; the silver nitrate solution is poured into the ammonium molybdate solution, and the mixture is stirred uniformly under ultrasonic conditions to obtain a precursor; S2, synthesis of cellulose paper / silver molybdate composite material: the pH of the precursor in step S1 is adjusted to about 2 with dilute nitric acid; the cellulose paper is placed in the precursor solution with adjusted pH, and is reacted in a high-pressure reaction kettle at 100-120 DEG C for 1-1.5 h; silver molybdate nanofibers grow in large quantities on the cellulose paper to obtain a cellulose paper / silver molybdate composite material; the material in the reaction kettle is filtered, and the cellulose paper / silver molybdate composite material is washed with deionized water for 3-5 times until the washing liquid is neutral; and the composite material is dried in a vacuum oven at low temperature to obtain a composite material; S3, ultraviolet light reduction: the silver molybdate / cellulose paper composite material in step S2 is irradiated with ultraviolet light, the temperature is controlled to be constant at 35 DEG C, and the light irradiation time is 1-30 min; the reduced silver atoms nucleate and continuously grow on the surface of the silver molybdate particles and the adjacent cellulose, and finally form visible silver nanoparticles deposited on the surface of the assembly, thereby obtaining an Ag@ silver molybdate / cellulose paper composite material.

[0006] Further, in step S1, the concentration of the silver nitrate solution is 0.1-0.2 mol / L; and the concentration of the ammonium molybdate solution is 0.1-0.2 mol / L. By changing the concentration of the precursor, the amount of silver molybdate grown on the cellulose paper can be directly controlled. The mass of the cellulose paper / silver molybdate composite material is positively correlated with the concentration of the precursor.

[0007] Further, in step S1, the molar ratio of the ammonium molybdate solution to the silver nitrate solution is 1:5.5-6.5.

[0008] Further, in step S2, the concentration of the dilute nitric acid solution is 1-3 mol / L.

[0009] The application of the Ag@silver molybdate / cellulose paper triple hybrid framework, the Ag@silver molybdate / cellulose paper composite material is applied in a water purification system; the water purification network formed by the Ag@silver molybdate / cellulose paper composite material is connected to a sewage pool and a clean water pool; the fibers of the Ag@silver molybdate / cellulose paper composite material form a rich three-dimensional intercommunication pore structure, the inside of the pore has a strong capillary effect, the capillary force continuously transports sewage to the water purification network, in the process of the sewage flowing through the water purification network, the Ag@silver molybdate / cellulose paper composite material plays an adsorption function, and the purified water continuously flows to the clean water pool, so that the economic and efficient continuous purification of wastewater is realized. The entire purification system does not need additional reagents and power assistance, and does not produce solid waste.

[0010] The application simulates sand with Ag particles, simulates fibrous roots of plant root systems with silver molybdate, and simulates main roots of plant root systems with cellulose paper, designs an Ag@silver molybdate / cellulose paper triple hybrid framework, and realizes a water purification structure model simulating nature main roots + fibrous roots + sand.

[0011] Further, the silver ions in the silver molybdate can form S-Ag coordination bonds with sulfur-containing organic substances, can selectively adsorb sulfur-containing organic dyes, and can realize selective recovery of sulfur-containing dyes in mixed dyes.

[0012] The beneficial effects of the application are as follows: compared with the prior art, the synthesis method of the Ag@silver molybdate / cellulose paper triple hybrid framework and the application thereof in water purification provided by the application have the following advantages: from a macroscopic scale, the product has a macroscopic size, and meets the operability requirement of actual application; from a micro-nano scale, the surface of each fiber is uniformly wrapped with a nanowire to form a unique nanowire@fiber core-shell structure, and the material is endowed with a unique non-energy-consuming capillary water transport function; from a molecular scale, the silver ions in the silver molybdate structure can form reversible Ag-S bonds with sulfur atoms, can specifically recognize and capture sulfur-containing small molecules, and can realize separation of sulfur-containing molecules. The product can not only efficiently capture methylene blue molecules from a methylene blue aqueous solution, but also can specifically capture methylene blue from a methylene blue / rhodamine B mixed solution, realizes continuous and efficient separation of small molecules, and has a high water flow rate (2187 mLh -1 m -2), which shows a high efficient flow purification effect, significantly higher than the flow rate of silver molybdate / cellulose paper composite (1562 mLh -1 m -2 ) under the same conditions. The patent technology research provides a new idea for the design of high-efficiency molecular separation materials and the research and development of separation technology, and has certain industrial application value. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 (a) is the two-step strategy for generating Ag@Ag2Mo3O 10 (a) is the schematic diagram of Ag2Mo3O 10 (a) is the schematic diagram of Ag2Mo3O

[0014] Figure 2 (a) is the XRD pattern of cellulose paper, silver molybdate, cellulose paper / silver molybdate; (b) is the XRD pattern of cellulose paper / silver molybdate prepared by reducing the concentration of the precursor solution by half under different light irradiation times; (c) is the XRD pattern of cellulose paper / silver molybdate prepared by reducing the concentration of the precursor solution to 1 / 4 of the original under different light irradiation times.

[0015] Figure 3 (a) is the SEM image of 10 μm cellulose paper; (b) is the SEM image of 10 μm cellulose paper / silver molybdate; (c) is the SEM image of 10 μm cellulose paper / silver molybdate prepared by reducing the concentration of the precursor solution by half under light irradiation for 30 min; (d) is the SEM image of 10 μm cellulose paper / silver molybdate prepared by reducing the concentration of the precursor solution to 1 / 4 of the original under light irradiation for 30 min.

[0016] Figure 4 (a) is the SEM image of 10 μm cellulose paper; (b) is the SEM image of 10 μm cellulose paper / silver molybdate; (c) is the SEM image of 10 μm cellulose paper / silver molybdate prepared by reducing the concentration of the precursor solution by half under light irradiation for 30 min; (d) is the SEM image of 10 μm cellulose paper / silver molybdate prepared by reducing the concentration of the precursor solution to 1 / 4 of the original under light irradiation for 30 min.

[0017] Figure 5 (a) is the UV-Vis absorption spectrum of Ag@silver molybdate / cellulose paper on methylene blue; (b) is the UV-Vis absorption spectrum of Ag@silver molybdate / cellulose paper on mixed dyes; (c) is the UV-Vis absorption spectrum of Ag@silver molybdate / cellulose paper on rhodamine b.

[0018] Figure 6(a) is the UV-Vis absorption spectrum of Ag@silver molybdate / cellulose paper against MB in ethanol; (b) is the UV-Vis absorption spectrum of Ag@silver molybdate / cellulose paper against MB in acetone; (c) is the UV-Vis absorption spectrum of Ag@silver molybdate / cellulose paper against MB in DMF; (d) is the UV-Vis absorption spectrum of Ag@silver molybdate / cellulose paper against MB in DMSO.

[0019] Figure 7 (a) is the UV-Vis absorption spectrum of Ag@Ag2Mo3O 10 (a) is the color change of 1.8H2O / cellulose paper mixed framework after passing through MB, RhB and MB / RhB mixed solution; (b) is the digital photo of MB continuously flowing through Ag@Ag2Mo3O 10 (a) is the color change of 1.8H2O / cellulose paper mixed framework after passing through MB, RhB and MB / RhB mixed solution; (b) is the digital photo of MB continuously flowing through Ag@Ag2Mo3O 10 (a) is the color change of 1.8H2O / cellulose paper mixed framework after passing through MB, RhB and MB / RhB mixed solution; (b) is the digital photo of MB continuously flowing through Ag@Ag2Mo3O DETAILED DESCRIPTION

[0020] The application will be further described below by means of specific examples. However, these examples are only used to illustrate the application and not to limit the scope of the application.

[0021] EMBODIMENT A synthesis method of an Ag@silver molybdate / cellulose paper triple hybrid framework, the synthesis method comprising the following steps: S1, synthesis of a precursor: 0.24 g of silver nitrate is added to 12 mL of water to prepare a silver nitrate solution, and 0.465 g of molybdate ammonium tetrahydrate is dissolved in 18 mL of water to prepare a molybdate ammonium solution; the prepared silver nitrate solution is poured into the molybdate ammonium solution, and the mixture is stirred uniformly under ultrasonic condition to obtain a precursor; S2, synthesis of a cellulose paper / silver molybdate composite material: the pH of the precursor in step S1 is adjusted to about 2 by using 1 mol / L dilute nitric acid; the cellulose paper is put into the precursor solution with adjusted pH value, and is reacted in a high-pressure reaction kettle at 110°C for 1 h; a large amount of silver molybdate nanofiber grows on the cellulose paper to obtain a cellulose paper / silver molybdate composite material; the material in the reaction kettle is filtered, and the cellulose paper / silver molybdate composite material is washed with deionized water for 3-5 times until the washing liquid after washing is neutral; and the composite material is dried at low temperature in a vacuum oven to obtain the composite material.

[0022] S3, ultraviolet light reduction: the silver molybdate / cellulose paper composite material in step S2 is irradiated with ultraviolet light, the temperature is controlled to be constant at 35°C, and the light irradiation time is 1-30 min; the reduced silver atoms nucleate and continuously grow on the surface of the silver molybdate particles and the adjacent cellulose to finally form visible silver nanoparticles deposited on the surface of the assembly, thereby obtaining an Ag@silver molybdate / cellulose paper composite material.

[0023] The application of Ag@ silver molybdate / cellulose paper triple hybrid framework, the Ag@ silver molybdate / cellulose paper composite material is applied to a water purification system; the water purification network formed by the Ag@ silver molybdate / cellulose paper composite material is connected with a sewage pool and a water purification pool; the Ag@ silver molybdate / cellulose paper composite material forms a rich three-dimensional intercommunication pore structure between fibers, the inside of the pore has a strong capillary effect, and the capillary force continuously transports sewage to the water purification network; in the process of flowing through the water purification network, the Ag@ silver molybdate / cellulose paper composite material plays an adsorption function, and the purified water continuously flows to the water purification pool, so that the economic and efficient continuous purification of wastewater is realized. The entire purification system does not need additional reagents and power assistance, and does not produce solid waste. Silver ions in the silver molybdate can form S-Ag coordination bonds with sulfur-containing organic substances, can selectively adsorb sulfur-containing organic dyes, and can realize selective recovery of sulfur-containing dyes in mixed dyes.

[0024] The application simulates sand with Ag particles, simulates fibrous roots of plant root systems with silver molybdate, and simulates main roots of plant root systems with cellulose paper, designs an Ag@ silver molybdate / cellulose paper triple hybrid framework, and realizes a water purification structure model simulating nature main roots + fibrous roots + sand.

[0025] As Figure 1 (a) shows a two-step strategy for generating Ag@Ag2Mo3O 10 1.8H2O / cellulose paper, silver molybdate / cellulose paper composite material is prepared by introducing cellulose paper into a hydrothermal growth system of silver molybdate. After ultraviolet light, an Ag@ silver molybdate / cellulose paper hybrid framework is generated. As Figure 1 (b) shows digital photos of original cellulose paper and Ag2Mo3O 10 1.8H2O / cellulose paper, the white cellulose paper after the reaction turns green, and a layer of obvious solid is attached to the surface. By comparing the mass difference before and after growth, it is calculated that the growth amount of silver molybdate can reach 20 mg / cm 2 In addition, this method has no limitation on the shape of cellulose paper, and a 100 mL reaction kettle can allow 100 cm 2 of paper to be curled and placed, realizing silver molybdate growth modification, and proving the universality and convenience of the method. Due to the strong capillary force of the nanochannel, it is an ideal platform for forming and transporting continuous water columns. Water transportation test shows that the water transportation rate of a piece of cellulose paper (size: 4 cm x 18 cm) is as high as 2.06 L h −1 m −2 , indicating that the water transportation efficiency of cellulose paper is very high. Therefore, cellulose paper is used to build an Ag@ silver molybdate / cellulose paper hybrid framework.

[0026] AsFigure 2 (a) is the XRD pattern of cellulose paper, silver molybdate, cellulose paper / silver molybdate (prepared by controlling the concentration of silver nitrate solution in the precursor solution to be 0.12 mol / L and the concentration of ammonium molybdate solution to be 0.02 mol / L); the XRD diffraction peak of the cellulose paper after the growth of silver molybdate is the superposition of the pure silver molybdate and cellulose paper signals, which proves that the silver molybdate is successfully grown on the cellulose paper. As Figure 2 (b) is the XRD pattern of cellulose paper / silver molybdate prepared by reducing the concentration of the precursor solution by half (the concentration of silver nitrate solution is 0.06 mol / L and the concentration of ammonium molybdate solution is 0.01 mol / L) under different illumination times; as Figure 2 (c) is the XRD pattern of cellulose paper / silver molybdate prepared by reducing the concentration of the precursor solution to 1 / 4 of the initial concentration (the concentration of silver nitrate solution is 0.03 mol / L and the concentration of ammonium molybdate solution is 0.005 mol / L) under different illumination times. After illumination, the sample gradually forms a new diffraction peak at 2θ of 47°, which is consistent with the diffraction peak of Ag particles, proving that silver molybdate is more likely to form silver nanoparticles under illumination conditions, and a ternary composite material is obtained.

[0027] Figure 3 (a) is the SEM image of 10 μm cellulose paper; (b) is the SEM image of 10 μm cellulose paper / silver molybdate (prepared by controlling the concentration of silver nitrate solution in the precursor solution to be 0.12 mol / L and the concentration of ammonium molybdate solution to be 0.02 mol / L); (c) is the SEM image of 10 μm cellulose paper / silver molybdate prepared by reducing the concentration of the precursor solution by half (the concentration of silver nitrate solution is 0.06 mol / L and the concentration of ammonium molybdate solution is 0.01 mol / L) under illumination for 30 min; (d) is the SEM image of 10 μm cellulose paper / silver molybdate prepared by reducing the concentration of the precursor solution to 1 / 4 of the initial concentration (the concentration of silver nitrate solution is 0.03 mol / L and the concentration of ammonium molybdate solution is 0.005 mol / L) under illumination for 30 min. Figure 4(a) SEM image of 100 μm cellulose paper; (b) SEM image of 100 μm cellulose paper / silver molybdate (control precursor solution, silver nitrate solution concentration 0.12 mol / L, ammonium molybdate solution concentration 0.02 mol / L prepared); (c) SEM image of 100 μm cellulose paper / silver molybdate prepared by reducing the concentration of the precursor solution by half (silver nitrate solution concentration 0.06 mol / L, ammonium molybdate solution concentration 0.01 mol / L) for 30 min of light exposure; (d) SEM image of 100 μm cellulose paper / silver molybdate prepared by reducing the concentration of the precursor solution to 1 / 4 of the initial concentration (silver nitrate solution concentration 0.03 mol / L, ammonium molybdate solution concentration 0.005 mol / L) for 30 min of light exposure. By adjusting the concentration of the precursor (adjusting the concentration of the silver nitrate solution to 0.12 mol / L, 0.06 mol / L, 0.03 mol / L, respectively; the corresponding concentration of the ammonium molybdate solution is 0.02 mol / L, 0.01 mol / L, 0.005 mol / L, respectively), the growth density of silver molybdate can be controlled, and silver molybdate@cellulose papers with different loadings can be obtained (the content of silver molybdate is 0.14 g, 0.068 g, 0.034 g, respectively). In order to clarify the role of silver molybdate in the formation of the hybrid framework, we used a scanning electron microscope to observe the hybrid framework with different silver molybdate contents (0.14 g, 0.068 g, 0.034 g, respectively). Figure 3 The silver molybdate shown in (a) and (b) is uniformly wrapped on the surface of cellulose, forming a unique nanowire@fiber core-shell structure, which gives the material a unique non-energy-consuming capillary water transport function. Figure 3 The high-density silver molybdate shown in (c) and (d) generates sand-like silver nanoparticles faster than the low-density silver molybdate under the same light exposure time. Figure 4 The cellulose paper surface shown in (a) and (b) before light exposure is covered with a large amount of easily detached silver molybdate, Figure 4 (c) and (d) show that the higher the concentration of silver molybdate, the greater the growth density, and a silver molybdate nanowire wrapping layer is formed.

[0028] As shown in Figure 5 The UV-Vis absorption spectrum of the filtrate is shown in the figure, and the characteristic band at 700 nm of MB Figure 5 a) completely disappears, indicating that the removal efficiency of Ag@silver molybdate / cellulose paper for MB is close to 100%. The absorption peak at about 500-600 nm of RhB Figure 5 c) shows a certain degree of decline but does not completely disappear, indicating that Ag@silver molybdate / cellulose paper removes RhB pollutants in water to a certain extent, but RhB remains in the treated solution. Figure 5b is the UV-Vis absorption spectrum of Ag@silver molybdate / fiber paper on MB / RhB mixed dyes, the characteristic peak of 600-700 nm disappears, and there is still a convex near 500 nm, indicating that the treatment process effectively degrades MB and RhB in the mixture, but there is still RhB residue. It embodies the selective adsorption function of the triple hybrid system.

[0029] As shown in Figure 6 , the removal effect of single dye MB in different solvents was tested by using cellulose paper as the substrate and the flow water body energyless network. The test results show that in the system with ethanol or acetone as the solvent, it has good removal effect, while in the system with DMF or DMSO as the solvent, it has almost no removal effect; It preliminarily shows the industrial application value of the mixed framework.

[0030] As shown in Figure 7 , the MB solution, RhB solution and MB / RhB mixed solution were passed through Ag@silver molybdate / fiber paper respectively. For the MB solution, as shown in Figure 7 (a) and (b), the filtrate is completely decolorized, while the filtrate of the RhB solution is light red, Figure 7 (a) and (c), which indicates that Ag@silver molybdate / fiber paper allows RhB molecules to pass through continuously and freely, while preventing MB molecules to a certain extent. It realizes the continuous separation of methylene blue and rhodamine B.

[0031] The above embodiments are only used to illustrate the present application, and are not limited to the present application. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, therefore all equivalent technical solutions also belong to the scope of the present application, the patent protection scope of the present application should be defined by the claims.

Claims

1. A method for synthesizing an Ag@silver molybdate / cellulose paper triple hybrid framework, characterized in that: The synthesis method comprises the following steps: S1, synthesis of a precursor: silver nitrate is added to water to prepare a silver nitrate solution, and ammonium molybdate tetrahydrate is dissolved in water to prepare an ammonium molybdate solution; the silver nitrate solution is poured into the ammonium molybdate solution, and the mixture is stirred uniformly under ultrasonic conditions to obtain a precursor; S2, synthesis of a cellulose paper / molybdenum silver composite material: the pH of the precursor in step S1 is adjusted to about 2 by using dilute nitric acid; the cellulose paper is placed in the precursor solution with the adjusted pH, and is reacted in a high-pressure reaction kettle at 100-120 DEG C for 1-1.5 h; molybdenum silver nanofibers grow in large quantities on the cellulose paper to obtain a cellulose paper / molybdenum silver composite material; the material in the reaction kettle is filtered, and the cellulose paper / molybdenum silver composite material is washed with deionized water for 3-5 times until the washing liquid after washing is neutral, and then the composite material is dried in a vacuum oven at low temperature to obtain the composite material; S3, ultraviolet light reduction: the molybdenum silver / cellulose paper composite material in step S2 is irradiated with ultraviolet light, the temperature is controlled to be constant at 35 DEG C, and the light irradiation time is 1-30 min; the reduced silver atoms nucleate and continuously grow on the surface of the molybdenum silver particles and the adjacent cellulose, and finally form visible silver nanoparticles deposited on the surface of the assembly to obtain an Ag@molybdenum silver / cellulose paper composite material.

2. The method for synthesizing Ag@silver molybdate / cellulose paper triple hybrid framework according to claim 1, characterized in that: In step S1, the concentration of the silver nitrate solution is 0.1-0.2 mol / L; and the concentration of the ammonium molybdate solution is 0.1-0.2 mol / L.

3. The method for synthesizing an Ag@silver molybdate / cellulose paper triple hybrid framework as described in claim 1, characterized in that: In step S1, the molar ratio of the ammonium molybdate solution to the silver nitrate solution is 1:5.5-6.

5.

4. The method for synthesizing an Ag@silver molybdate / cellulose paper triple hybrid framework as described in claim 1, characterized in that: In step S2, the concentration of the dilute nitric acid solution is 1-3 mol / L.

5. The use of the Ag@ silver molybdate / cellulose paper triple hybrid framework according to claim 1, characterized in that: The Ag@molybdenum silver / cellulose paper composite material is applied to a water purification system; a water purification network made of the Ag@molybdenum silver / cellulose paper composite material is connected to a sewage pool and a clean water pool; the fibers of the Ag@molybdenum silver / cellulose paper composite material form a rich three-dimensional intercommunication pore structure, the inside of the pore has a strong capillary action, and the capillary force continuously transmits sewage to the water purification network; in the process of the sewage flowing through the water purification network, the Ag@molybdenum silver / cellulose paper composite material plays an adsorption function, and the purified water continuously flows into the clean water pool, so that the wastewater is economically and efficiently continuously purified.

6. The use of the Ag@ silver molybdate / cellulose paper triple hybrid framework according to claim 5, characterized in that: The silver ions in the molybdenum silver can form S-Ag coordination bonds with sulfur-containing organic substances, can selectively adsorb sulfur-containing organic dyes, and can realize selective recovery of sulfur-containing dyes in mixed dyes.

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