Preparation method and application of nano-metal adsorbent for industrial arsenic removal

Abstract

The invention discloses a preparation method and application of a nano-metal adsorbent for industrial arsenic removal, and the preparation method comprises the following steps: S1, ultrasonically mixing a first metal compound and a polyethylene glycol solution, then adding a second metal compound, heating and stirring, then adjusting the solution to be alkaline, cooling, aging, washing, filtering and drying to obtain a composite metal oxide; s2, trihydroxymethyl aminomethane hydrochloride Tris. HCl is added into deionized water, the pH is adjusted to be alkaline for dissolution, dopamine hydrochloride DA.HCl is added, the composite metal oxide is added after dissolution, stirring is conducted, polydopamine is generated on the surface of the composite metal oxide, then a nano carrier is added, heating stirring, filtering and washing are conducted, and the nano metal adsorbent is obtained. According to the nano metal adsorbent for industrial arsenic removal, the arsenic adsorption amount can be doubled through double adsorption of the metal compound and the nano adsorption carrier.

Description

Technical Field

[0001] This invention belongs to the field of adsorption materials technology, specifically relating to a method for preparing and applying a nano-metal adsorbent for industrial arsenic removal. Background Technology

[0002] Arsenic in nature mainly exists in the form of inorganic arsenic (As(III) and As(V)). Arsenic can enter the environmental medium through natural processes and human activities, such as the interaction between arsenic-containing minerals and water, industrial wastewater discharge, and fossil fuel combustion. Arsenic exposure is primarily through food and drinking water, and can enter the body through the skin, mucous membranes, respiratory tract, and digestive tract, causing arsenic poisoning. Developing practical technologies for removing arsenic pollution from wastewater and exhaust gases is a hot topic of concern both domestically and internationally. Currently, various technologies are being explored to remove arsenic from wastewater and exhaust gases. Highly efficient arsenic removal technologies include membrane separation, coagulation and sedimentation, ion exchange, biological treatment, and adsorption. Among these, adsorption technology has advantages such as high efficiency, low cost of adsorbents, a wide variety of adsorbents to choose from, and the ability to regenerate adsorbents. The core of current adsorption technology is the development of highly efficient adsorption materials. Among numerous adsorbents, nano-metal adsorbents, with their high surface atomic unsaturation, abundant surface functional groups, diverse chemical composition, and varied structures and morphologies, are widely used in wastewater and exhaust gas environments.

[0003] In the ethylene industry, trace amounts of arsenic compounds are present during hydrocarbon cracking, catalytic reforming, hydrogenation processes, and waste gas and liquid treatment. Although the arsenic content is very low, it can cause catalyst poisoning and environmental pollution. Therefore, to avoid these problems, industrial processes often require the adsorption and removal of arsenic to remove arsenic compounds as much as possible; otherwise, it will have a certain impact on product quality and the environment.

[0004] Adsorption refers to the surface phenomenon where surrounding substances spontaneously concentrate or accumulate at a phase interface. Adsorption can occur between different phase interfaces. In wastewater and waste gas treatment, solid adsorbents are generally used to adsorb and remove pollutants from wastewater and waste gas. The core of adsorption lies in the selection of the adsorbent. Currently, the main arsenic removal adsorbent used in China is activated alumina. This material is inexpensive and readily available, but it has drawbacks such as a narrow operating pH range, low adsorption capacity leading to frequent regeneration, and high aluminum leaching from water, which can be harmful to human health.

[0005] Metal oxides are among the most common adsorbent materials. However, with the continuous reduction of the concentration threshold for pollutants, the adsorption effect of single metal oxides is no longer sufficient. While some metal oxides have good adsorption capacity, their respective defects are also significant. Therefore, composite metal oxides have emerged. The synergistic effect of composite metal oxides significantly improves the adsorption performance of adsorbents, and the shortcomings of each metal can be complemented, resulting in superior material performance. Composite materials refer to new materials with novel properties formed by combining two or more materials with different properties through physicochemical methods. In recent years, research on using composite metal oxides (bimetallic or trimetallic oxides) as adsorbents to remove specific pollutants has increased significantly, and numerous scholars have conducted extensive research on their adsorption behavior and mechanisms.

[0006] Patent CN202311109235.X discloses a sulfur-resistant gaseous arsenic adsorbent material, its preparation method, and its application, belonging to the field of gaseous arsenic adsorption technology. Specifically, it relates to a sulfur-resistant gaseous arsenic adsorbent material, its preparation method, and its application. Manganese oxide and an iron source are mixed and placed in a ball mill jar. The jar is then sealed and filled with argon gas, followed by ball milling to obtain an iron-modified manganese oxide adsorbent material. The addition of iron improves the sulfur resistance of manganese oxide, allowing the adsorbent to maintain a high gaseous arsenic adsorption capacity even under high SO2 conditions, making it suitable for the removal of gaseous arsenic from typical high-SO2 flue gas—non-ferrous smelting flue gas. The preparation method of this invention is simple, low-cost, and has a large gaseous arsenic adsorption capacity, showing broad application prospects. However, this method cannot desorb arsenic from liquids, and the structure of a single metal adsorbent is not stable enough and is easily oxidized and decomposed.

[0007] Patent CN202211302596.1 discloses a gaseous arsenic adsorption material and its preparation and application, belonging to the field of gaseous arsenic adsorption. Specifically, it relates to a porous material formed by the aggregation of amorphous iron-manganese oxide nanoparticles that adsorb oxygen on their surface. This invention also provides the preparation and application of the aforementioned gaseous arsenic adsorption material. In this invention, based on the synergistic effect of the affinity of iron for arsenic and the oxidizing ability of manganese for arsenic in the material, as well as the amorphous phase and high specific surface area of ​​the material, the material achieves a capture capacity of up to 102.8 mg / g for gaseous arsenic. Thermogravimetric results show that the material exhibits almost no mass loss at high temperatures after arsenic adsorption. This is because the material significantly promotes the high-temperature stability of the adsorbed gaseous arsenic and reduces secondary arsenic release at high temperatures. Furthermore, this preparation method can effectively improve the acid resistance and high-temperature adsorption stability of the material. However, this method cannot desorb arsenic from liquids, and the structure of a single metal adsorbent is not stable enough and is easily oxidized and decomposed.

[0008] Patent CN202110591384.9 discloses an arsenic adsorbent material, its preparation method, and its application. The arsenic adsorbent material comprises a Ti-3C-2T-x matrix and iron oxide, with the iron oxide loaded on the surface and / or between layers of the Ti-3C-2T-x matrix. Tx is any one or a combination of at least two of the functional groups -OH, -O, or -F. The arsenic adsorbent material of this invention exhibits a high adsorption rate for arsenic, a large saturated adsorption capacity, a wide applicable concentration range, strong anti-interference ability, and no secondary pollution. The material after adsorption saturation is easily desorbed and can be recycled. However, the preparation method is overly cumbersome and complex, and costly, making it unsuitable for industrial applications.

[0009] Patent CN112755957 A discloses a highly efficient arsenic removal agent and its preparation method, belonging to the field of arsenic removal and purification technology. This arsenic removal agent is composed of 13x molecular sieve and TS-1 titanium-silicon molecular sieve as carriers I, Group IVB elements as carriers II, Group VIII fourth-period elements as main agent I, Group VIII fifth and sixth-period elements as main agents II, and lanthanide elements as auxiliary agents. The highly efficient arsenic removal agent provided by this invention has the advantages of high arsenic capacity, high arsenic removal precision, good stability, and long service life, and can be used in the purification of natural gas, syngas, flue gas, coal gas, blast furnace gas, coke oven gas, light gas, liquid hydrocarbons, and ethylene-rich gases. However, this method cannot remove and adsorb arsenic from liquids.

[0010] Patent CN201811162149.4 discloses an arsenic removal agent, its preparation method, and its uses. The arsenic removal agent of this invention includes a carrier and an active component loaded on the carrier. The carrier is a mixture of activated carbon and alumina. The active component is a Ni-Cu-Mo-Co system active component. Based on the mass of the carrier (100%), the mass percentage of Ni is 10-20%, the mass percentage of Cu is 5-10%, the mass percentage of Mo is 1-5%, and the mass percentage of Co is 1-3%. The preparation method of the arsenic removal agent of this invention is simple, and the impregnation and calcination processes are straightforward. The obtained arsenic removal agent exhibits good arsenic removal effect at room temperature, high arsenic removal precision, and long service life when used for arsenic removal from gasoline, which is of great significance for reducing atmospheric arsenic emissions. However, the preparation method is overly cumbersome and complex, and the cost is high. Summary of the Invention

[0011] The purpose of this invention is to provide a method for preparing and applying a nano-metal adsorbent for industrial arsenic removal.

[0012] To achieve the above objectives, the present invention provides a method for preparing an industrial arsenic removal nano-metal adsorbent, comprising the following steps:

[0013] S1, the first metal compound is ultrasonically mixed with a polyethylene glycol solution, then the second metal compound is added, the mixture is heated and stirred, the solution is then adjusted to alkaline, cooled and aged, washed, filtered and dried to obtain a composite metal oxide;

[0014] S2, Tris·HCl hydrochloride is added to deionized water, the pH is adjusted to alkaline and dissolved, then dopamine hydrochloride DA·HCl is added, and after dissolution, the composite metal oxide is added and stirred. Polydopamine is generated on the surface of the composite metal oxide. Then, a nanocarrier is added, heated and stirred, filtered and washed to obtain the nano metal adsorbent.

[0015] In the preparation method of the industrial arsenic removal nano-metal adsorbent of the present invention, in step S1, the pH of the solution is adjusted to 8-12.

[0016] In the preparation method of the industrial arsenic removal nano-metal adsorbent of the present invention, in step S1, the aging temperature is 5-20℃ and the aging time is 2-6 hours.

[0017] The method for preparing the industrial arsenic removal nano-metal adsorbent of the present invention, wherein the first metal and the second metal are one or more of copper, magnesium, iron, cerium and manganese, and the first metal and the second metal are different.

[0018] In the preparation method of the industrial arsenic removal nano-metal adsorbent of the present invention, in step S1, the heating temperature is 30-80℃ and the stirring time is 0.5-10 hours.

[0019] In the preparation method of the industrial arsenic removal nano-metal adsorbent of the present invention, in step S2, the mass ratio of the composite metal oxide, the nanocarrier, and the mixture of tris(hydroxymethyl)aminomethane hydrochloride and dopamine hydrochloride is 1:(0.02-2):(0.05-1).

[0020] The method for preparing the industrial arsenic removal nano-metal adsorbent of the present invention comprises one or more of activated carbon, graphene oxide, carbon nanotubes, clay minerals, zeolite, montmorillonite, alumina, and molecular sieves.

[0021] The method for preparing the industrial arsenic removal nano-metal adsorbent of the present invention uses one or more of the molecular sieves selected from 13X, ZSM-5, ZSM-22, ZSM-23, NaY, and HY.

[0022] The present invention discloses a method for preparing a nano-metal adsorbent for industrial arsenic removal, wherein the nano-carrier has an average particle size of 0.01-500 nm and a specific surface area of ​​100-500 m². 2 / g.

[0023] To achieve the above objectives, the present invention also provides an application of the nano-metal adsorbent prepared by the above method in the treatment of arsenic-containing waste gas and liquid.

[0024] Beneficial effects:

[0025] (1) The nano metal adsorbent for industrial arsenic removal described in this invention has good particle morphology and adjustable particle size.

[0026] (2) The dual adsorption of metal compounds and nano-adsorbents in the industrial arsenic removal nano metal adsorbent of the present invention can double the amount of arsenic adsorbed.

[0027] (3) The industrial arsenic removal nano metal adsorbent used in this invention impregnates the active nano adsorbent carrier with a solution containing metal ions, and grafts the metal ions onto the nano adsorbent carrier through dopamine self-polymerization. The preparation method is simple and has low production cost, and can be applied to industrial production and waste gas and liquid treatment. Detailed Implementation

[0028] The present invention will now be described in detail through embodiments. It should be noted that the following embodiments are only for further illustration of the present invention and should not be construed as limiting the scope of protection of the present invention. Those skilled in the art can make some non-essential improvements and adjustments to the present invention based on the above description.

[0029] Example 1

[0030] Take 3.8g of the prepared Fe3O4 and mix it with 30ml of polyethylene glycol solution (5wt%) and sonicate for 30min. Then mix it with 4.3g of CuCl2, stir rapidly and heat to 50℃. After the temperature stabilizes, slowly add 1mol / L NaOH solution dropwise until the pH stabilizes at about 11.5. After the pH stabilizes, stop stirring and age the solution at 8℃ for 4h. After aging, pour off the supernatant, add an equal amount of deionized water, let it stand to precipitate, and then pour off the supernatant again. Repeat this process of rinsing the material several times. Finally, filter the solution, dry the material at 80℃, grind it and seal it for storage to obtain the iron-copper composite oxide.

[0031] Dissolve 0.12 g of tris(hydroxymethyl)aminomethane hydrochloride (Tris·HCl) in 100 ml of deionized water, adjust the pH to 8-10, then add 0.24 g of dopamine hydrochloride (DA·HCl), stir rapidly to dissolve, then add 4.42 g of the above iron-copper composite oxide, pour the mixture into a three-necked flask, and mechanically stir for 0.5 h. At this time, dopamine gradually polymerizes into PDA and grafts onto the oxide surface. Add 8 g of GO, continue stirring for 3 h, filter and wash the solution to obtain the PDA-modified nano-metal adsorbent.

[0032] Example 2

[0033] Take 250 mL of 0.2 mol·L⁻¹ -1 Fe(NO3)3 solution was mixed with 30 ml of polyethylene glycol solution (5 wt%) and sonicated for 30 min. Then, it was mixed with 3.5 g of CuCl2, stirred rapidly, and heated to 50 °C. After the temperature stabilized, 1 mol / L NaOH solution was slowly added dropwise until the pH stabilized at around 11.5. After the pH stabilized, stirring was stopped, and the solution was aged at 8 °C for 4 h. After aging, the supernatant was poured off, an equal amount of deionized water was added, and the mixture was allowed to stand to precipitate. The supernatant was then poured off again, and the material was washed repeatedly. Finally, the solution was filtered, and the material was dried at 80 °C. After grinding, it was sealed and stored to obtain the iron-copper composite oxide.

[0034] Dissolve 0.12 g of tris(hydroxymethyl)aminomethane hydrochloride (Tris·HCl) in 100 ml of deionized water, adjust the pH to 8-10, then add 2.4 g of dopamine hydrochloride (DA·HCl), stir rapidly to dissolve, then add 3.82 g of the above iron-copper composite oxide, pour the mixture into a three-necked flask, and stir mechanically for 0.5 h. At this time, dopamine gradually polymerizes into PDA and grafts onto the oxide surface. Add 0.2 g of GO, continue stirring for 3 h, filter and wash the solution to obtain PDA-modified nano-metal adsorbent.

[0035] Example 3

[0036] Take 3.8 g of the prepared Fe3O4 and mix it with 30 ml of polyethylene glycol solution (5 wt%), then sonicate for 30 min. Add 20 ml of 1 mol·L⁻¹ solution. -1 KOH solution was added to 0.05 mol·L⁻¹ -1 The solution is then mixed with the above solution in a KMnO4 solution, stirred rapidly, and heated to 50°C. After the temperature stabilizes, 1 mol / L NaOH solution is slowly added dropwise until the pH stabilizes at around 10.5. Once the pH stabilizes, stirring is stopped, and the solution is aged at 8°C for 4 hours. After aging, the supernatant is poured off, an equal amount of deionized water is added, and the mixture is allowed to stand and precipitate. The supernatant is then poured off again, and the material is washed repeatedly. Finally, the solution is filtered, and the material is dried at 80°C. After grinding, it is sealed and stored to obtain the iron-manganese composite oxide, i.e., the iron-manganese composite oxide / graphene oxide carrier.

[0037] Dissolve 0.12 g of tris(hydroxymethyl)aminomethane hydrochloride (Tris·HCl) in 100 ml of deionized water, adjust the pH to 8-10, then add 0.24 g of dopamine hydrochloride (DA·HCl), stir rapidly to dissolve, then add 6.42 g of the above iron-manganese composite oxide, pour the mixture into a three-necked flask, and stir mechanically for 0.5 h. At this time, dopamine gradually polymerizes into PDA and grafts onto the oxide surface. Add 0.2 g of GO, continue stirring for 3 h, filter and wash the solution to obtain PDA-modified nano-metal adsorbent.

[0038] Example 4

[0039] Take 3.8g of the prepared Fe3O4 and mix it with 30ml of polyethylene glycol solution (5wt%) and sonicate for 30min. Then mix it with 4.85g of Cu(NO3)2, stir rapidly and heat to 50℃. After the temperature stabilizes, slowly add 1mol / L NaOH solution to the solution until the pH stabilizes at about 9.5. After the pH stabilizes, stop stirring and age the solution at 8℃ for 4h. After aging, pour off the supernatant, add an equal amount of deionized water, let it stand to precipitate, and then pour off the supernatant again. Repeat this process of rinsing the material several times. Finally, filter the solution, dry the material at 80℃, grind it and seal it for storage to obtain the iron-copper composite oxide, i.e., iron-copper composite oxide / graphene oxide carrier.

[0040] Dissolve 0.12 g of tris(hydroxymethyl)aminomethane hydrochloride (Tris·HCl) in 100 ml of deionized water, adjust the pH to 8-10, then add 0.24 g of dopamine hydrochloride (DA·HCl), stir rapidly to dissolve, then add 4.42 g of the above iron-copper composite oxide, pour the mixture into a three-necked flask, and stir mechanically for 0.5 h. At this time, dopamine gradually polymerizes into PDA and grafts onto the oxide surface. Add 0.2 g of GO, continue stirring for 3 h, filter and wash the solution to obtain PDA-modified nano-metal adsorbent.

[0041] Example 5

[0042] Take 3.8g of the prepared Fe3O4 and mix it with 30ml of polyethylene glycol solution (5wt%) and sonicate for 30min. Then mix it with 4.3g of CuSO4, stir rapidly and heat to 50℃. After the temperature stabilizes, slowly add 1mol / L NaOH solution to the solution until the pH stabilizes at about 11.5. After the pH stabilizes, stop stirring and age the solution at 8℃ for 4h. After aging, pour off the supernatant, add an equal amount of deionized water, let it stand to precipitate, and then pour off the supernatant again. Repeat this process of rinsing the material several times. Finally, filter the solution, dry the material at 80℃, grind it and seal it for storage to obtain the iron-copper composite oxide, i.e., iron-copper composite oxide / graphene oxide carrier.

[0043] Dissolve 0.12 g of tris(hydroxymethyl)aminomethane hydrochloride (Tris·HCl) in 100 ml of deionized water, adjust the pH to 8-10, then add 0.24 g of dopamine hydrochloride (DA·HCl), stir rapidly to dissolve, then add 5.32 g of the above iron-copper composite oxide, pour the mixture into a three-necked flask, and stir mechanically for 0.5 h. At this time, dopamine gradually polymerizes into PDA and grafts onto the oxide surface. Add 0.2 g of GO, continue stirring for 3 h, filter and wash the solution to obtain the PDA-modified nano-metal adsorbent.

[0044] Example 6

[0045] Take 3.8g of the prepared Fe3O4 and mix it with 30ml of polyethylene glycol solution (5wt%) and sonicate for 30min. Then mix it with 4.3g of CuCl2, stir rapidly and heat to 50℃. After the temperature stabilizes, slowly add 1mol / L NaOH solution to the solution until the pH stabilizes at about 8.5. After the pH stabilizes, stop stirring and age the solution at 8℃ for 4h. After aging, pour off the supernatant, add an equal amount of deionized water, let it stand to precipitate, and then pour off the supernatant again. Repeat this process of rinsing the material several times. Finally, filter the solution, dry the material at 80℃, grind it and seal it for storage to obtain the iron-copper composite oxide, i.e., iron-copper composite oxide / carbon nanotube carrier.

[0046] Dissolve 0.12 g of tris(hydroxymethyl)aminomethane hydrochloride (Tris·HCl) in 100 ml of deionized water, adjust the pH to 8-10, then add 0.24 g of dopamine hydrochloride (DA·HCl), stir rapidly to dissolve, then add 4.42 g of the above-mentioned iron-copper composite oxide, pour the mixture into a three-necked flask, and stir mechanically for 0.5 h. At this time, dopamine gradually polymerizes into PDA and grafts onto the oxide surface. Add 0.2 g of carbon nanotube solution, continue stirring for 3 h, filter and wash the solution to obtain PDA-modified nano-metal adsorbent.

[0047] Example 7

[0048] Take 3.8g of the prepared Fe3O4 and mix it with 30ml of polyethylene glycol solution (5wt%) and sonicate for 30min. Then mix it with 4.3g of CuCl2, stir rapidly and heat to 50℃. After the temperature stabilizes, slowly add 1mol / L NaOH solution to the solution until the pH stabilizes at about 11.5. After the pH stabilizes, stop stirring and age the solution at 8℃ for 4h. After aging, pour off the supernatant, add an equal amount of deionized water, let it stand to precipitate, and then pour off the supernatant again. Repeat this process of rinsing the material several times. Finally, filter the solution, dry the material at 80℃, grind it and seal it for storage to obtain the iron-copper composite oxide, i.e., iron-copper composite oxide / alumina carrier.

[0049] Dissolve 0.12 g of tris(hydroxymethyl)aminomethane hydrochloride (Tris·HCl) in 100 ml of deionized water, adjust the pH to 8-10, then add 0.24 g of dopamine hydrochloride (DA·HCl), stir rapidly to dissolve, then add 4.42 g of the above-mentioned iron-copper composite oxide, pour the mixture into a three-necked flask, and stir mechanically for 0.5 h. At this time, dopamine gradually polymerizes into PDA and grafts onto the oxide surface. Add 0.3 g of alumina, continue stirring for 3 h, filter and wash the solution to obtain PDA-modified nano-metal adsorbent.

[0050] Comparative Example 1

[0051] Dissolve 0.12 g of tris(hydroxymethyl)aminomethane hydrochloride (Tris·HCl) in 100 ml of deionized water, adjust the pH to 8-10, then add 0.24 g of dopamine hydrochloride (DA·HCl), stir rapidly to dissolve, then add 4.42 g of CuCl2 and 3.6 g of FeCl3, pour the mixture into a three-necked flask, stir mechanically for 0.5 h, then add 8 g of GO, continue stirring for 3 h, filter and wash the solution to obtain PDA-modified nano-metal adsorbent.

[0052] Comparative Example 2

[0053] Take 3.8g of the prepared Fe3O4 and mix it with 30ml of polyethylene glycol solution (5wt%) and sonicate for 30min. Then mix it with 4.3g of CuCl2, stir rapidly and heat to 50℃. After the temperature stabilizes, slowly add 1mol / L NaOH solution dropwise until the pH stabilizes at about 11.5. After the pH stabilizes, stop stirring and age the solution at 8℃ for 4h. After aging, pour off the supernatant, add an equal amount of deionized water, let it stand to precipitate, and then pour off the supernatant again. Repeat this process of rinsing the material several times. Finally, filter the solution, dry the material at 80℃, grind it and seal it for storage to obtain the iron-copper composite oxide.

[0054] 4.42g of the above iron-copper composite oxide was mixed with 0.2g of GO, and 0.12g of tris(hydroxymethyl)aminomethane hydrochloride (Tris·HCl) was dissolved in 100ml of deionized water. The pH was adjusted to 8-10, and then 0.24g of dopamine hydrochloride (DA·HCl) was added. After stirring rapidly to dissolve, the mixture was poured into a three-necked flask and mechanically stirred for 0.5h to obtain the PDA-modified nano-metal adsorbent.

[0055] Test methods

[0056] Take 20 ml of the arsenic-containing sample to be tested and add it to the adsorbent of the examples and comparative examples, respectively. After stirring and filtering, obtain the adsorbed sample. Take 5 g of the adsorbed sample, dissolve it in 5% hydrochloric acid, and after making up to volume, determine the arsenic content in the acid solution by atomic fluorescence hydride generation. The specific results are shown in the table below.

[0057]

[0058]

[0059] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the claims of the present invention.

Claims

1. A method for preparing an industrial arsenic-removing nanometal adsorbent, characterized by, Includes the following steps: S1, the first metal compound is ultrasonically mixed with a polyethylene glycol solution, then the second metal compound is added, the mixture is heated and stirred, the solution is then adjusted to alkaline, cooled and aged, washed, filtered and dried to obtain a composite metal oxide; S2, Tris·HCl hydrochloride is added to deionized water, the pH is adjusted to alkaline and dissolved, then dopamine hydrochloride DA·HCl is added, and after dissolution, the composite metal oxide is added and stirred. Polydopamine is generated on the surface of the composite metal oxide. Then, a nanocarrier is added, heated and stirred, filtered and washed to obtain the nano metal adsorbent.

2. The preparation method of the industrial arsenic removal nano-metal adsorbent according to claim 1, characterized in that, In step S1, the pH of the solution is adjusted to 8-12.

3. The method for preparing the industrial arsenic removal nano-metal adsorbent according to claim 1, characterized in that, In step S1, the aging temperature is 5-20℃ and the aging time is 2-6 hours.

4. The method of claim 1, wherein the industrial arsenic-removing nanometallic adsorbent is prepared by the steps of: The first metal and the second metal are one or more of copper, magnesium, iron, cerium and manganese, and the first metal and the second metal are different.

5. The method for preparing the industrial arsenic removal nano-metal adsorbent according to claim 1, characterized in that, In step S1, the heating temperature is 30-80℃ and the stirring time is 0.5-10 hours.

6. The method of claim 1, wherein the industrial arsenic-removing nanometallic adsorbent is prepared by the steps of: In step S2, the mass ratio of the composite metal oxide, the nanocarrier, and the mixture of tris(hydroxymethyl)aminomethane hydrochloride and dopamine hydrochloride is 1:(0.02-2):(0.05-1).

7. The method for preparing the industrial arsenic removal nano-metal adsorbent according to claim 1, characterized in that, The nanocarrier is one or more of the following: activated carbon, graphene oxide, carbon nanotubes, clay minerals, zeolite, montmorillonite, alumina, and molecular sieves.

8. The method for preparing the industrial arsenic removal nano-metal adsorbent according to claim 7, characterized in that, The molecular sieve is one or more of 13X, ZSM-5, ZSM-22, ZSM-23, NaY, and HY.

9. The method for preparing the industrial arsenic removal nano-metal adsorbent according to claim 1, characterized in that, The average particle size of the nanocarrier is 0.01-500nm, and the specific surface area is 100-500m 2 / g.

10. The application of the nano-metal adsorbent prepared by the method of any one of claims 1-9 in the treatment of arsenic-containing waste gas and liquid.

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