CN107486184A - It is a kind of to be used to remove sorbing material of inorganic mercury ion and methyl mercury compound and preparation method thereof in water body - Google Patents

Abstract

The invention provides a method for preparing an adsorption material for removing inorganic mercury ions and methylmercury compounds in water, comprising the following steps: reacting polyvinyl alcohol airgel in a molybdenum disulfide precursor solution to obtain the adsorption material . The present invention adopts the solvothermal reaction of polyvinyl alcohol airgel and molybdenum disulfide precursor to prepare polyvinyl alcohol airgel modified by molybdenum disulfide nanoflowers; the polyethylene modified by molybdenum disulfide nanoflowers prepared by the present invention Alcohol airgel as an adsorption material can well adsorb inorganic mercury ions and methylmercury compounds in water, has a high adsorption rate, and will not cause secondary pollution to water bodies. The method is simple and the cost is low.

Description

An adsorption material for removing inorganic mercury ions and methylmercury compounds in water bodies and its preparation method

technical field

The invention relates to the technical field of water treatment, in particular to an adsorption material for removing inorganic mercury ions and methylmercury compounds in water bodies and a preparation method thereof.

Background technique

Water is the most important natural resource on which living things depend, and it is an important part of the ecological environment for human beings. Affected by human activities, a large amount of untreated urban garbage, polluted soil, industrial wastewater, domestic sewage, and atmospheric sediment are continuously discharged into the water, resulting in an increasing trend of pollutants in the water body year by year. Nowadays, the vast majority of cities in our country have more prominent water quality problems to varying degrees. The content of heavy metals in suspended matter and sediments in water bodies increased sharply.

Mercury, commonly known as "mercury", is the only liquid metal at room temperature and is highly toxic. It has the characteristics of large specificity (13.564), low melting point (-38.87°C), high boiling point (356.95°C), good electrical conductivity and uniform expansion coefficient. Wide range of applications. Mercury-containing wastewater mainly comes from chlor-alkali chemical plants (mercury method), non-ferrous metal smelters (flue gas washing), amalgam recovery of precious metals, pesticide plants (insecticides, fungicides, fungicides, seed selection agents, etc.), chemical Industry (catalyst), paper industry (bactericide, viscous agent and flocculation remover, etc.), electrical and electronic industry (connecting circuits, manufacturing switches, light bulbs and batteries, etc.), petrochemical and plastic industry (catalyst), measuring instruments, A certain amount of mercury-containing wastewater is also discharged from the production of thermometers and pressure gauges and the pharmaceutical (disinfectant, preservative, etc.) industry, as well as explosives, pharmaceuticals, printing and dyeing, cosmetics, photographic industries, scientific research institutions, and hospital laboratories. Mercury-containing wastewater is one of the most harmful industrial wastewater in the world. Mercury and its compounds discharged into water bodies form various forms of mercury through physical, chemical and biological actions, especially can be converted into highly toxic methyl compounds (a representative substance is methylmercury), which is harmful to aquatic organisms and humans. Mercury and its compounds mainly enter the organism through the digestive tract. The basic toxicology is that mercury combines with the sulfhydryl group of enzyme protein to hinder the metabolism of cells. Inorganic ion mercury has the highest concentration in the kidney, followed by the liver, spleen, and thyroid gland, and it is extremely difficult to enter the human brain. If it is organic mercury, the accumulation of alkylmercury in the liver ranks first, followed by the kidney, and the third in brain tissue and testis. The Minamata disease that occurred in Japan in 1953 was caused by the discharge of mercury catalysts in chemical plants into the water.

The prior art discloses many methods for removing inorganic mercury ions and methylmercury compounds in water, including chemical precipitation, ion exchange, activated carbon adsorption, chemical reduction reaction, electrolysis, and the like. However, the chemical precipitation method is not only difficult to control the amount of sulfide, but also the sulfide residue will bring great toxicity and easily cause secondary pollution to the water body; the ion exchange method is cumbersome and complicated to operate, the cost of ion exchange resin is too high, and the effect is not ideal; The activated carbon adsorption method has a good removal efficiency for organic mercury, but the removal efficiency for inorganic mercury is limited; the chemical reduction reaction method is not suitable for the removal of organic mercury; the electrolysis method consumes a lot of energy. high cost.

Contents of the invention

In view of this, the technical problem to be solved by the present invention is to provide a method for preparing an adsorbent material for removing inorganic mercury ions and methylmercury compounds in water bodies. All mercury-based compounds can be well adsorbed, the adsorption rate is high, and no secondary pollution is caused to the water body, the method is simple, and the cost is low.

The invention provides a method for preparing an adsorption material for removing inorganic mercury ions and methylmercury compounds in water, comprising the following steps:

The polyvinyl alcohol airgel is reacted in the molybdenum disulfide precursor solution to obtain the adsorption material.

Preferably, the polyvinyl alcohol airgel is prepared according to the following method:

Polyvinyl alcohol reacts hydrothermally with inorganic acid to obtain polyvinyl alcohol airgel.

Preferably, the polyvinyl alcohol is an aqueous solution of polyvinyl alcohol, and the mass concentration of the aqueous solution of polyvinyl alcohol is 3%-7%; the inorganic acid is sulfuric acid; the concentration of the inorganic acid is 3-5mol/L.

Preferably, it also includes adding an aqueous solution of multi-walled carbon nanotubes; the mass concentration of the aqueous solution of multi-walled carbon nanotubes is 1% to 3%.

Preferably, the concentration of the molybdenum disulfide precursor solution is 2-2.5 mg/mL; the mass ratio of the polyvinyl alcohol airgel to the molybdenum disulfide precursor is (0.2-0.5): (0.04-0.05) .

Preferably, a protective agent is added to the reaction; the protective agent is trioctylphosphine; the volume ratio of the protective agent to the solution is (6-8): (15000-25000).

Preferably, the reaction temperature is 200°C; the reaction time is 24h.

Preferably, the molybdenum disulfide precursor is ammonium tetrathiomolybdate; the solution is N,N-dimethylformamide.

The invention provides an adsorption material for removing inorganic mercury ions and methylmercury compounds in water, which is prepared by the preparation method described in the above technical solution.

The invention provides a method for removing inorganic mercury ions and methylmercury compounds in water bodies. The adsorption material prepared by the preparation method described in the above technical solution is used to adsorb inorganic mercury ions and/or methylmercury compounds in water bodies.

Compared with the prior art, the present invention provides a method for preparing an adsorption material for removing inorganic mercury ions and methylmercury compounds in water bodies, comprising the following steps: polyvinyl alcohol airgel in molybdenum disulfide precursor solution In the reaction, the adsorption material is obtained. The present invention adopts the solvothermal reaction of polyvinyl alcohol airgel and molybdenum disulfide precursor to prepare polyvinyl alcohol airgel modified by molybdenum disulfide nanoflowers; the polyethylene modified by molybdenum disulfide nanoflowers prepared by the present invention Alcohol airgel as an adsorption material can well adsorb inorganic mercury ions and methylmercury compounds in water, has a high adsorption rate, and will not cause secondary pollution to water bodies. The method is simple and the cost is low.

Description of drawings

Fig. 1 is the embodiment of the present invention 5, the comparison chart of the survival rate of yellow catfish larvae;

Fig. 2 is the experimental result display figure of embodiment 7 of the present invention; Wherein (a) mercury ion dynamic absorption curve; (b) adsorption material records the distribution coefficient to mercury ion under different environments; (c) methylmercury compound removal rate test;

Fig. 3 (a) is the measurement result of the anti-interference ability of the adsorption material of the embodiment 8 of the present invention; (b) the comparison diagram of the distribution coefficient of the adsorption material of the embodiment 8 of the present invention in 4 cycles;

Fig. 4 is a comparison diagram of the adsorption capacity of molybdenum disulfide nanoflowers modified in Example 9 of the present invention and independently synthesized molybdenum disulfide nanoflower solids under the same mass;

Figure 5 is a scanning electron micrograph of the airgel prepared in Example 2 of the present invention at low resolution and high resolution;

Fig. 6 is a high-resolution transmission electron microscope image of monodisperse molybdenum disulfide nanoflowers.

detailed description

The invention provides a method for preparing an adsorption material for removing inorganic mercury ions and methylmercury compounds in water, comprising the following steps:

The polyvinyl alcohol airgel is reacted in the molybdenum disulfide precursor solution to obtain the adsorption material.

The present invention does not limit the source of the polyvinyl alcohol airgel, which can be commercially available or prepared by a method well known to those skilled in the art.

According to the present invention, it is preferably prepared according to the following method:

Polyvinyl alcohol reacts hydrothermally with inorganic acid to obtain polyvinyl alcohol airgel.

In the present invention, the polyvinyl alcohol is an aqueous solution of polyvinyl alcohol, and the mass concentration of the aqueous solution of polyvinyl alcohol is preferably 3%-7%; more preferably 4%-6%; most preferably 5%.

The inorganic acid is sulfuric acid; the concentration of the inorganic acid is 3-5 mol/L; more preferably 4-5 mol/L.

According to the present invention, preferred scheme is:

Add 15-25 mL of 3%-7% polyvinyl alcohol aqueous solution, add 0.5-1.5 mL of 3-5 mol/L inorganic acid; more preferably:

Add 20-25mL of 3%-7% polyvinyl alcohol aqueous solution, and add 1-1.5mL of 3-5mol/L mineral acid.

According to the present invention, it also includes adding an aqueous solution of multi-walled carbon nanotubes; the mass concentration of the aqueous solution of multi-walled carbon nanotubes is preferably 1% to 3%; more preferably 2% to 3%.

The present invention does not limit the sources of the polyvinyl alcohol, inorganic acid and multi-walled carbon nanotubes, as long as those skilled in the art are familiar with them. available commercially.

In the present invention, the reaction temperature of the hydrothermal reaction is 180-200°C; the reaction time is 18-24h.

The reaction of the present invention is preferably carried out in a reactor.

After the reaction, the polyvinyl alcohol airgel was obtained by drying.

The present invention does not limit the drying method, preferably freeze-drying, and the present invention does not limit the specific parameters of the freeze-drying, as long as those skilled in the art are familiar with it.

After drying, the polyvinyl alcohol self-crosslinking airgel is prepared.

The polyvinyl alcohol airgel prepared by the present invention has excellent characteristics of airgel, such as low density, large specific surface area and the like. In addition, the product has good mechanical properties. When the colloid is compressed to 50% of the deformation, it can still maintain the integrity of the colloid, and when the pressure is removed, the colloid can return to its original geometric size. After 20 compression cycles, the gel itself is not damaged. Its excellent mechanical properties lay the foundation for its application in production and life.

The polyvinyl alcohol airgel is reacted in the molybdenum disulfide precursor solution to obtain the adsorption material.

Preferably specifically:

Soak the dry polyvinyl alcohol airgel in the N,N-dimethylformamide (DMF) solution of the molybdenum disulfide precursor, and transfer the solution to the reactor, and use the solvothermal method to react in the reactor , which can generate adsorption materials for mercury pollutants.

In the present invention, the concentration of the molybdenum disulfide precursor solution is preferably 2-2.5 mg/mL; more preferably 2.2-2.4 mg/mL.

In the present invention, the molybdenum disulfide precursor is preferably ammonium tetrathiomolybdate; the solution includes but is not limited to N,N-dimethylformamide.

The present invention does not limit the sources of the ammonium tetrathiomolybdate and N,N-dimethylformamide, which are commercially available.

According to the present invention, the mass ratio of the polyvinyl alcohol airgel to the molybdenum disulfide precursor is preferably (0.2-0.5): (0.04-0.05); more preferably (1.5-1.8): (0.045-0.048).

In the present invention, the reaction preferably also adds a protective agent; the protective agent is preferably trioctylphosphine;

Preferably specifically:

Add solvent, molybdenum disulfide precursor, and protective agent into the reaction kettle, stir, and add airgel to react.

In the present invention, the volume ratio of the protective agent to the solution is preferably (6-8): (15000-25000); more preferably (7-8): (20000-25000).

In the present invention, the reaction temperature is 180-200° C.; the reaction time is 18-24 hours.

The invention provides a method for preparing an adsorption material for removing inorganic mercury ions and methylmercury compounds in water, comprising the following steps: reacting polyvinyl alcohol airgel in a molybdenum disulfide precursor solution to obtain the adsorption material . The present invention adopts the solvothermal reaction of polyvinyl alcohol airgel and molybdenum disulfide precursor to prepare polyvinyl alcohol airgel modified by molybdenum disulfide nanoflowers; the polyethylene modified by molybdenum disulfide nanoflowers prepared by the present invention Alcohol airgel as an adsorption material can well adsorb inorganic mercury ions and methylmercury compounds in water, has a high adsorption rate, and will not cause secondary pollution to water bodies. The method is simple and the cost is low.

The invention provides an adsorption material for removing inorganic mercury ions and methylmercury compounds in water, which is prepared by the preparation method described in the above technical solution.

The invention provides a method for removing inorganic mercury ions and methylmercury compounds in water bodies. The adsorption material prepared by the preparation method described in the above technical solution is used to adsorb inorganic mercury ions and/or methylmercury compounds in water bodies.

The polyvinyl alcohol airgel has excellent mechanical properties, so the adsorption material prepared by the present invention can be cut into different sizes as required. Soak the cut adsorption material in the mercury-polluted water body and shake it for a certain period of time to complete the purification of the water body.

After the water body is purified according to the method proposed by the invention, the adsorbent can be clamped out with tweezers, and the pollutants can be separated from the water body. And it can be recycled by soaking the adsorbent material in dilute hydrochloric acid solution. Experiments have proved that after 4 purification-recovery-purification cycles, the adsorption performance of the adsorption material itself has no sign of decay. It shows that the adsorbent material synthesized in the present invention has stable properties, so it is also beneficial to cost control.

After the water body is purified by using the adsorbent material synthesized in the present invention, the basic life activities of aquatic organisms will not be affected. Its survival rate is comparable to the biological survival rate in normal water bodies. It shows that the adsorption material synthesized in the present invention has an excellent purification effect, and at the same time, it is non-toxic and harmless, and will not cause secondary pollution to water bodies. Experimental results show that the adsorption material synthesized in the present invention not only has good absorption performance for inorganic mercury ions (Hg ²⁺ ), but also has high absorption efficiency for methylmercury compound (MeHg ⁺ ).

In order to further illustrate the present invention, the following examples will describe in detail the adsorption material and its preparation method for removing inorganic mercury ions and methylmercury compounds in water provided by the present invention.

Example 1

Add 1mL of 4mol/L sulfuric acid to 20mL of 5% polyvinyl alcohol aqueous solution, then react in a reactor at 200°C for 24h by hydrothermal method, and freeze-dry to form polyvinyl alcohol airgel. Soak 0.2 g of dry polyvinyl alcohol airgel in 45.5 mg of ammonium tetrathiomolybdate in 20 mL of N,N-dimethylformamide (DMF) solution, and transfer the solution to a reaction kettle, and use solvothermal In the method, react in a reactor at 200°C for 24 hours to generate an adsorption material for mercury pollutants.

Example 2

Add 1mL of 4mol/L sulfuric acid and 1mL of 2% aqueous solution of multi-walled carbon nanotubes to 20mL of a 5% mass concentration polyvinyl alcohol aqueous solution, then react in a reactor at 200°C for 24 hours by hydrothermal method, and freeze After drying, polyvinyl alcohol airgel can be produced. Soak 0.3 g of dry polyvinyl alcohol airgel in 45.5 mg of ammonium tetrathiomolybdate in 20 mL of N,N-dimethylformamide (DMF) solution, add 7 μL of trioctylphosphine, stir, and transfer the solution Put it into the reaction kettle, use the solvothermal method, react in the reaction kettle at 200°C for 24 hours, and then generate the adsorption material for mercury pollutants.

Example 3

Add 1mL of 3mol/L sulfuric acid to 20mL of 3% mass concentration polyvinyl alcohol aqueous solution, and 1mL of 2% multi-walled carbon nanotube aqueous solution, then use hydrothermal method to react in a reactor at 200°C for 24h, freeze After drying, polyvinyl alcohol airgel can be produced. Soak 0.5 g of dry polyvinyl alcohol airgel in 42 mg of ammonium tetrathiomolybdate in 20 mL of N,N-dimethylformamide (DMF) solution, add 6 μL of trioctylphosphine, stir, and transfer the solution Put it into the reaction kettle, use the solvothermal method, react in the reaction kettle at 200°C for 24 hours, and then generate the adsorption material for mercury pollutants.

Example 4

Add 1mL of 5mol/L sulfuric acid and 1mL of 2.5% aqueous solution of multi-walled carbon nanotubes to 20mL of a 7% mass concentration polyvinyl alcohol aqueous solution, then react in a reactor at 200°C for 24 hours by hydrothermal method, and freeze After drying, polyvinyl alcohol airgel can be produced. Soak 0.4 g of dry polyvinyl alcohol airgel in 48 mg of ammonium tetrathiomolybdate in 20 mL of N,N-dimethylformamide (DMF) solution, add 7 μL of trioctylphosphine, stir, and transfer the solution to In the reaction kettle, use the solvothermal method to react in the reaction kettle at 200°C for 24 hours to generate the adsorption material for mercury pollutants.

Example 5

Table 1 shows the survival rate of yellow catfish juveniles before and after the lake water is purified by the adsorbent materials prepared in Examples 1-2 of the present invention.

All the water used to raise the juvenile yellow catfish comes from the lake water of Changchun Nanhu Park. Fish juveniles were divided into four groups of ten, and each fish was housed in a separate beaker with the same volume of water in the control beaker. In order to increase the reliability of the experiment and reduce the experimental error, the individual differences of each fish should be controlled within a certain range. The quality of the fish is controlled between 400 and 500 mg.

Group A: add 200mL of clean water and a young fish to each beaker;

Group B: Add 200 mL of clean water and one young fish to each beaker. Dissolve 40mg of mercuric chloride solid in another 3mL of water, take 0.2mL of the solution and add it to the beaker. At this time, the final concentration of mercury ions is 10000 ppb;

Group C: Add 200 mL of clean water and one fish pup to each beaker. 40 mg of mercuric chloride solid was dissolved in another 3 mL of water. Add 200 mg (wet weight) of the adsorption material of Examples 1-2 to the above solution and shake the solution for 24 hours. Add 0.2 mL of this purified solution to each beaker.

Group D: Add 200 mL of clean water and one young fish to each beaker. Another 3 mL of clean water was added to 200 mg (wet weight) of the adsorbent material of Examples 1-2 and shaken for 24 hours. Take 0.2 mL of the treated solution and add to each beaker.

During the whole experiment, the above four sets of beakers were stored at room temperature.

The survival of the juvenile fish was observed at any time and recorded. As shown in Figure 1, Fig. 1 is embodiment 5 of the present invention, the comparison chart of the survival rate of yellow catfish juvenile; Experimental result shows, in B group, under the poisoning action of high-concentration mercury ion, all fish juveniles in 3.5h All died. In groups C and D, the fish juveniles can maintain a high survival rate, indicating that the adsorption material itself has very low toxicity and has a strong adsorption capacity for mercury ions, which can reduce high concentrations of mercury ions to very low concentrations. low range.

The final statistical results are shown in Table 1.

Table 1 lake water adopts the result of survival rate before and after purification of the adsorbent material prepared by embodiment 2 of the present invention

Example 6

Table 2 shows the concentration of inorganic mercury ions in water before and after purification using the adsorbent materials prepared in Examples 1 to 4 of the present invention.

Table 2 adopts the water quality result before and after purification of the adsorption material prepared by the embodiment of the present invention 1～4

Example 7

Put 1g of adsorbent material (wet weight) into 30mL of water with a mercury ion concentration of 10000ppb, shake the solution for a certain period of time, and use the inductively coupled plasma method to test the concentration of mercury ions in the solution. It can be found that in just 40 minutes, 99% of the mercury ions are adsorbed by the material. The lowest concentration of mercury ions can be reduced to the lowest detection limit of the instrument (0.1ppb).

②The solution configuration method in Figure 2b: Prepare 3mL of the two solutions with pH values of 3 and 10 respectively, and prepare some water from Changchun Nanhu Park and some seawater from Donghai Bay in Shanghai, and artificially add a certain amount of chloride to the above liquids Mercury, so that the final concentration of mercury ions is 10,000 ppb, and add 50 mg of adsorption material to the respective solutions, and shake the solutions. After 24 h, the concentration of mercury ions in the solution was tested by inductively coupled plasma method. According to Equation 1, the values of partition coefficients were calculated respectively.

Formula 1:

Among them, C ₀ and _Ce are the initial and final concentrations of mercury ions, respectively; V represents the volume of sewage treated (mL); m represents the mass of the adsorbent in dry state (g).

③ In the methylmercury removal experiment, take a certain amount of methylmercury standard solution and make it into a concentration of 100ng/mL. Take 200 mg (wet weight) of the adsorbent material and add it to 3 mL of the above solution, and shake the solution for 24 hours. The concentration of mercury was measured by inductively coupled plasma-mass spectrometry. The average value of three parallel tests was taken and the standard deviation was calculated (Figure 2c).

Fig. 2 is the experimental result display figure of embodiment 7 of the present invention; Wherein (a) mercury ion dynamic absorption curve; (b) adsorption material records the distribution coefficient to mercury ion under different environments; (c) methylmercury compound removal rate test.

It can be seen from Fig. 2(a) that in just 40 minutes, the adsorbent material can purify 99% of mercury ions; while in Fig. 2(b), pH is 3 or 10, both have no effect on the distribution coefficient of mercury ions. It shows that the adsorption material can work normally in a wide pH range, while in natural lake water and sea water with more complex composition, the distribution coefficient of mercury ions is still unaffected, indicating that the adsorption material can work in a relatively complex environment. Complete the purification. In Fig. 2(c), for the presence of such a high concentration of methylmercury compound as 100ng/L, the adsorbent material can absorb more than 90% of the methylmercury compound.

Example 8

The anti-interference ability of the adsorbent material synthesized in the present invention is measured. Potassium (K ⁺ ), sodium (Na ⁺ ), calcium (Ca ^{2 +} ), magnesium (Mg ²⁺ ), lead (Pb ²⁺ ), cadmium (Cd ²⁺ ), nickel (Ni ²⁺ ), manganese ( In the presence of many ions such as Mn ²⁺ ), zinc (Zn ²⁺ ), chromium (Cr ²⁺ ), copper (Cu ²⁺ ), iron (Fe ³⁺ ), etc. The order of magnitude of the distribution coefficient of the ions has no effect, and the results are shown in Figure 3, Figure 3: a) determination of the distribution coefficient of mercury ions under the interference of many other ions; b) determination of the distribution coefficient of the adsorption material for 4 cycles.

In terms of repeated utilization of materials, the purified material after use is soaked in dilute hydrochloric acid for 24 hours, and its purification ability can be restored (Fig. 3b); Fig. 3(a) is the measurement result of the anti-interference ability of the adsorbent material in Example 8 of the present invention (b) Comparison diagram of the distribution coefficient of the adsorption material of Example 8 of the present invention in 4 cycles. It can be seen from Figure 3 that the distribution coefficient of mercury ions is not affected by the interference of many other interfering ions, and the purification ability of the purified material can be restored after soaking in dilute hydrochloric acid for 24 hours.

Example 9

Molybdenum disulfide nanoflowers are modified on the surface of polyvinyl alcohol airgel. This modification process plays a key role in the adsorption capacity of molybdenum disulfide nanomaterials. In the experiment, the adsorption capacity of the modified molybdenum disulfide nanoflowers of the present invention and independently synthesized molybdenum disulfide nanoflowers solids under the same mass is compared, and the results are shown in Figure 4, which is the modified molybdenum disulfide of the present invention Molybdenum nanoflowers and independently synthesized molybdenum disulfide nanoflower solids, the comparison chart of the adsorption capacity under the same mass; it can be seen from Figure 4 that after the modification process, the adsorption efficiency of molybdenum disulfide nanoflowers has been greatly improved. Fig. 5 is the scanning electron microscope picture of the airgel prepared by the present invention under the low resolution and high resolution; As can be seen from Fig. 5, the molybdenum disulfide nanoflower material is widely and evenly distributed on the surface of the airgel, and the dispersion is good; Fig. 6 is a high-resolution transmission electron microscope image of monodisperse molybdenum disulfide nanoflowers. It can be seen from Figure 6 that the molybdenum disulfide nanoflowers have a lot of wrinkled structures, which further increases their surface area and provides favorable conditions for the adsorption of mercury pollutants.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (10)

1. a kind of preparation method for being used to remove the sorbing material of inorganic mercury ion and methyl mercury compound in water body, its feature exist In comprising the following steps：

Polyvinyl alcohol aeroge reaction, obtains sorbing material in molybdenum disulfide precursor solution.

2. preparation method according to claim 1, it is characterised in that the polyvinyl alcohol aeroge is made as follows It is standby：

Polyvinyl alcohol and inorganic acid hydro-thermal reaction, obtain polyvinyl alcohol aeroge.

3. preparation method according to claim 2, it is characterised in that the polyvinyl alcohol is polyvinyl alcohol water solution, institute The mass concentration for stating polyvinyl alcohol water solution is 3%~7%；The inorganic acid is sulfuric acid；The concentration of the inorganic acid be 3~ 5mol/L。

4. preparation method according to claim 2, it is characterised in that also include adding the multi-walled carbon nanotube aqueous solution；Institute The mass concentration for stating the multi-walled carbon nanotube aqueous solution is 1%~3%.

5. preparation method according to claim 1, it is characterised in that the concentration of the molybdenum disulfide precursor solution is 2 ~2.5mg/mL；The mass ratio of the polyvinyl alcohol aeroge and molybdenum disulfide presoma is (0.2~0.5)：(0.04~ 0.05)。

6. preparation method according to claim 1, it is characterised in that protective agent is also added in the reaction；The protective agent For tri octyl phosphine；The volume ratio of the protective agent and the solution is (6~8)：(15000~25000).

7. preparation method according to claim 1, it is characterised in that the reaction temperature is 200 DEG C；The reaction time For 24h.

8. preparation method according to claim 1, it is characterised in that the molybdenum disulfide presoma is tetrathio molybdic acid Ammonium；The solution is DMF.

9. a kind of sorbing material for being used to remove inorganic mercury ion and methyl mercury compound in water body, it is characterised in that by right It is required that the preparation method described in 1~8 any one is prepared.

A kind of 10. method for removing inorganic mercury ion and methyl mercury compound in water body, it is characterised in that using claim 1 The sorbing material that preparation method described in~8 any one is prepared is to inorganic mercury ion in water body and/or methyl mercury chemical combination Thing is adsorbed.