CN111252845A

CN111252845A - Novel catalysis-adsorption material and preparation method and application thereof

Info

Publication number: CN111252845A
Application number: CN202010112642.6A
Authority: CN
Inventors: 谢武明; 毕小林
Original assignee: Guangdong University of Technology
Current assignee: Guangdong University of Technology
Priority date: 2020-02-24
Filing date: 2020-02-24
Publication date: 2020-06-09

Abstract

The invention discloses a novel catalysis-adsorption material, a preparation method and application thereof. The preparation method comprises the following steps: mixing gamma-Al₂O₃Adding Fe³⁺Introducing inert gas into the ionic solution, stirring uniformly, and adding NaBH₄Solution of Fe³⁺Reducing the iron into nano zero-valent iron, washing and drying to obtain the novel catalytic-adsorption material. The preparation method of the invention enables the nZVI to be uniformly attached to the surface of the active alumina and the pore structure thereof, enables the nZVI to be in a stable high surface energy state, catalyzes and oxidizes organic matters and simultaneously removes heavy metals by adsorption, and has the adsorption capacity of 223mg/g on arsenate; when the concentration of the roxarsone is lower than 100mg/L, the TOC and arsenic removal rates are both as high as99.9 percent, the final arsenic emission concentration in the solution is lower than 40ppb in the environment, the material also has the magnetism of zero-valent iron, is easy to separate from the reaction solution, has high treatment efficiency and low production cost, and has no secondary pollution to the environment.

Description

Novel catalysis-adsorption material and preparation method and application thereof

Technical Field

The invention relates to the technical field of preparation of adsorption materials, in particular to a novel catalysis-adsorption material and a preparation method and application thereof.

Background

In recent years, with the rapid development of large-scale and intensive livestock breeding industry, livestock breeding pollution becomes the third largest pollution source following industrial pollution and living pollution. The livestock and poultry breeding pollution contains a large amount of nutrient elements, namely nitrogen and phosphorus, which are one of the most important sources of water eutrophication, and on the other hand, the livestock and poultry breeding pollution also contains heavy metals and antibiotics, which are mainly derived from veterinary drugs and feed additives. In the common aquaculture wastewater treatment process, although heavy metals are easy to adsorb organic matters such as SS, and the effect of removing part of heavy metals can be achieved by treating and disposing the SS, the treatment process does not have a technology specially aiming at treating the heavy metals and antibiotics in the wastewater. Although the treatment process can ensure that the water quality meets the discharge standard of livestock and poultry breeding pollutants (GB18596-2001), the heavy metal content and the concentration of antibiotic compounds are higher than those of natural water in the environment. The migration, enrichment and virulent properties of heavy metals require strict control of the concentration of arsenic and the like in the aquaculture wastewater. Meanwhile, the gene is a hotbed of resistance genes in the environment of low-concentration antibiotics, and the resistance genes are used as novel environmental pollutants, and can carry out horizontal gene transfer and even self amplification between microbial strains by utilizing movable genetic elements such as plasmids, transposons and the like, so that the method is qualitatively different from the traditional environmental pollutants. If one wants to reduce the abundance of the resistance gene, the antibiotic concentration must be controlled. At present, the advanced oxidation technology is considered to be the method with the most application prospect for treating the organic matters difficult to degrade in water, and the adsorption method is commonly used for removing pollutants such as organic matters, heavy metals and the like due to the characteristics of high efficiency, low energy consumption, simple operation and the like.

The nanometer zero-valent iron (nZVI) has very active chemical property and very strong reducing capability, can perform a replacement reaction with partial metal, can perform an oxidation-reduction reaction with ions, organic matters, compounds and the like with strong oxidizability, can be used as an iron source to be combined with a Fenton method to remove organic matters which are difficult to degrade, and has a very good removing effect on a plurality of heavy metals. However, the existing nano zero-valent iron (nZVI) material is difficult to maintain high-level physicochemical properties due to the phenomenon of agglomeration caused by the volume effect and the surface interface effect of particles, and further the corresponding catalytic action and adsorption action of the nano zero-valent iron (nZVI) material are greatly influenced. CN103143705A discloses an alumina coated nano iron particle and a method for preparing the sameThe composite material is of a core-shell structure, takes zero-valent nano Fe particles as cores, and is uniformly coated with a layer of Al on the surface₂O₃. Al is evenly coated on the surface₂O₃The agglomeration resistance and the oxidation resistance of the zero-valent nano Fe particles can be improved, but no relevant technical suggestion is given for the stability of the high energy state of the surfaces of the zero-valent nano Fe particles, the maintenance of the physical and chemical properties, and particularly for the problem of how to further strengthen the relevant capacity of catalyzing and oxidizing organic matters and adsorbing heavy metals.

Disclosure of Invention

The invention aims to solve the technical problem that the existing nano zero-valent iron (nZVI) material cannot simultaneously overcome the agglomeration phenomenon and strengthen the capabilities of catalyzing and oxidizing organic matters and adsorbing heavy metals, and provides a preparation method of a novel catalysis-adsorption material.

Another object of the present invention is to provide a novel catalytic-adsorbent material.

Still another object of the present invention is to provide a novel catalytic-adsorption material for catalytic oxidation and adsorption of organic substances.

Still another object of the present invention is to provide a novel catalytic-adsorption material for the adsorption of heavy metals.

The above purpose of the invention is realized by the following technical scheme:

a preparation method of a novel catalytic-adsorption material comprises the following steps: mixing gamma-Al₂O₃Adding Fe³⁺Introducing inert gas (or other inert gas) into the ionic solution, stirring uniformly, and adding NaBH₄Solution of Fe³⁺Reducing the iron into nano zero-valent iron, washing and drying to obtain the novel catalytic-adsorption material,

wherein, gamma-Al₂O₃And Fe³⁺The ratio of the amount of ionic substances is 1 to 2:8 to 12

Fe³⁺Ions with NaBH₄The amount ratio of the substance(s) is 1 to 2:8 to 10.

Fe of the invention³⁺The ion may be ferric chloride hexahydrate.

The washing operation of the washing drying is preferably washing with 50-200mL of deionized water first, and then washing with 100-200mL of ethanol.

Activated alumina (gamma-Al)₂O₃) Has high activity and surface energy, can adsorb substances to form acidic and basic centers, and can play a catalytic role in a specific reaction and also be used as an adsorbent. The invention prepares the composite material with strong catalytic ability and strong adsorption ability by reducing ferric ions on the active alumina microspheres, and uses gamma-Al₂O₃The carrier is nZVI (nanometer zero-valent iron) which is uniformly attached to the surface of the active alumina and the pore structure of the active alumina, so that the nZVI is in a stable high surface energy state, and the physical and chemical properties of the nZVI are kept at the original higher level. The preparation method of the invention prepares the nZVI and the gamma-Al₂O₃nZVI/gamma-Al with the advantages of integration₂O₃The material overcomes the phenomenon that the nZVI is agglomerated due to the volume effect and the surface interface effect of particles, and simultaneously fully embodies the gamma-Al₂O₃The catalyst has the advantages of large specific surface area, high stability and developed pores, strengthens the capability of catalyzing and oxidizing organic matters and the capability of adsorbing heavy metals, and simultaneously, the magnetism of zero-valent iron is beneficial to the recycling of materials.

Preferably, gamma-Al₂O₃The particle size of the particles is 2 to 4 μm. gamma-Al₂O₃The particle size of the material can be controlled by operations such as grinding after preparation, and the control of the particle size range is helpful for preventing the material from caking when dissolved in water in subsequent reaction.

Preferably, the NaBH₄The adding speed of the solution is (firstly) 1-2 mL/min unit, and (secondly) 3-4 mL/min. Wherein the first is Fe at the beginning of the reaction³⁺The concentration is high, sodium borohydride should be added slowly, so that the violent reaction is prevented, and the nano zero-valent iron is prevented from being agglomerated; then later in the reaction, Fe³⁺The concentration is reduced, and the dropping rate of the sodium borohydride can be properly increased.

Preferably, the gamma-Al₂O₃And Fe³⁺The mass ratio of ionic substances is 1:10, Fe³⁺Ions with NaBH₄The amount of the substance(s) of (1: 4).

Preferably, the gamma-Al₂O₃The preparation method comprises the following steps: uniformly mixing sodium metaaluminate solution and urea, reacting for 8-12 h at 140-150 ℃, washing and drying a reaction product, and calcining for 2-3 h at 600-700 ℃ to obtain gamma-Al₂O₃，

Wherein the mass ratio of sodium metaaluminate to urea is 3-4: 7-8.

The reason why the reaction temperature is controlled to be 140-150 ℃ in the invention is as follows: if the temperature is too high, the conversion rate of the aluminate ions is reduced; too low a temperature reduces the urea decomposition efficiency and affects Al (OH)₃Yield;

meanwhile, the reason why the calcination temperature is controlled to be 600-700 ℃ is as follows: the calcination temperature is higher than 700 ℃ and the gamma-Al can not be generated₂O₃Microspheres; when the calcination temperature is lower than 600 ℃, gamma-phase Al cannot be generated₂O₃Microspheres cannot be produced.

Preferably, the mass ratio of the sodium metaaluminate to the urea is 3:7, the reaction temperature is 150 ℃, the reaction time is 8 hours, the calcination temperature is 600 ℃, and the calcination time is 2 hours.

The invention also provides a novel catalysis-adsorption material prepared by the preparation method of the novel catalysis-adsorption material, and the nano zero-valent iron is uniformly attached to gamma-Al₂O₃The surface and its pore structure.

The novel catalytic-adsorption material takes the activated alumina as a carrier, and due to the strong adsorption property, the high surface activity and the excellent thermal stability of the activated alumina, the nano zero-valent iron can be uniformly attached to the surface and the pores of the activated alumina in the preparation process, so that the advantages of the activated alumina are furthest embodied while the superiority of the nano zero-valent iron is not influenced.

The application of the novel catalytic-adsorption material in catalytic oxidation and adsorption of organic matters is also within the protection scope of the invention.

The application of the novel catalytic-adsorption material in the adsorption of heavy metals is also within the protection scope of the invention.

Preferably, the organic matter is roxarsone, and the initial pH value of the adsorption-catalysis organic matter is 3.0-8.5.

Preferably, the heavy metal is arsenic, and the initial pH value of the adsorbed organic matter is 3.0-8.5.

For example, the adsorption pH may be 3.21, 5.01, 7.04, or 8.50.

More preferably, the initial pH of the adsorption-catalytic organic matter is 3.21.

Preferably, the roxarsone concentration in the application is lower than 100 mg/L.

Rocarsone is an organic arsenic, i.e. one hydrogen on the phenyl ring is replaced by arsenate. The direct removal of rocarsone is difficult, and generally, arsenic acid radicals and benzene rings are firstly cracked through reaction, then free arsenic acid radicals in a solution are respectively removed, and the benzene rings are partially removed through catalytic oxidation.

The novel catalytic-adsorption material of the invention adsorbs organic matters through catalytic oxidation treatment, and the experimental conditions for treating the organic matters are as follows: the volume of the reaction solution is 100-200mL, the content of the roxarsone is 100-200 mg, the content of the sodium arsenate is 140-280 mg, the amount of the added adsorbent is 100-200 mg, and the supernatant is taken at intervals to measure the concentration of the solution until the reaction is balanced.

The novel catalytic-adsorption material nZVI/gamma-Al of the invention is adopted₂O₃Treating organic matter, and forming stable Fe on the surface of the organic matter in a Fenton-like system formed by the material³⁺And Fe²⁺The circulating system has the capability of efficiently and durably catalyzing and oxidizing organic matters, and effectively overcomes the defects of low oxidation efficiency, iron ion leaching and H in the Fenton-like technology₂O₂Low utilization efficiency and the like.

The novel catalytic-adsorption material of the invention is nZVI/gamma-Al₂O₃It also exhibits a very strong adsorption capacity for heavy metals, its adsorption capacity for arsenate is 223mg/g, and its final arsenic emission concentration is 40ppb below the natural level in the environment. The method can be used for treating organic matters and heavy metal polluted comprehensive wastewater, particularly for removing heavy metals and organic matters in aquaculture wastewater, can achieve the purposes of catalyzing and oxidizing the organic matters and simultaneously adsorbing and removing the heavy metals, and can be used for recovering the wastewater with composite pollutionThe advantages of the magnetic material are fully embodied by simple operation and thorough separation.

Compared with the prior art, the invention has the beneficial effects that:

the invention provides a preparation method of a novel catalytic-adsorption material, which is characterized in that ferric ions are reduced on activated alumina microspheres, so that nZVI (nano zero-valent iron) is uniformly attached to the surface of activated alumina and the pore structure of the activated alumina, and the nZVI is in a stable high surface energy state, thereby preparing a composite material with strong catalytic capability and strong adsorption capability.

The novel catalytic-adsorption material of the invention is nZVI/gamma-Al₂O₃Can achieve the purpose of catalytic oxidation of organic matters and adsorption removal of heavy metals.

The novel catalytic-adsorption material has magnetism of zero-valent iron, is easy to separate from reaction solution, has high treatment efficiency and low production cost, and has no secondary pollution to the environment.

Drawings

FIG. 1 is a graph of adsorption time vs. nZVI/γ -Al₂O₃The effects of heavy metals and organic matter are treated.

FIG. 2 is pH vs. nZVI/gamma-Al₂O₃Removing the effect of arsenic in the roxarsone solution.

FIG. 3 is pH vs. nZVI/γ -Al₂O₃The effect of TOC in the roxarsone solution was removed.

FIG. 4 shows nZVI/γ -Al₂O₃The removal effect on arsenic in the roxarsone solution with different concentrations is achieved.

FIG. 5 shows nZVI/γ -Al₂O₃The removal effect on TOC in roxarsone solutions with different concentrations is realized.

Detailed Description

The present invention will be further described with reference to specific embodiments, but the present invention is not limited to the examples in any way. The starting reagents employed in the examples of the present invention are, unless otherwise specified, those that are conventionally purchased.

Example 1

A preparation method of a novel catalytic-adsorption material comprises the following steps:

100mL of FeCl with the concentration of 0.1mol/L is prepared₃·6H₂O solution and 100mL of 0.4mol/LNaBH₄Solution (ready for use);

weighing 1.867g of gamma-Al₂O₃After fully grinding for 10min (gamma-Al)₂O₃Particle size of 4 μm) was added to 100ml of 0.1mol/L FeCl₃·6H₂Introducing nitrogen into the O solution, fully stirring for 30min under the mechanical stirring of the rotating speed of 240r/min, and then dropwise adding 0.4mol/L NaBH₄Solution (V)_FeCl3·6H2O：V_NaBH41:1), firstly slowing and then speeding, the dropping speed is (firstly) 1-2 mL/min unit, (secondly) 3-4 mL/min, after the reaction is finished, washing for 2 times by deionized water, then washing for 2 times by absolute ethyl alcohol, and then drying in vacuum at 40 ℃ to obtain the composite material,

wherein, gamma-Al₂O₃And Fe³⁺The mass ratio of ionic substances is 1: 10;

Fe³⁺ions with NaBH₄The ratio of the amounts of the substances of (a) to (b) is 1: 4.

Wherein, gamma-Al₂O₃The preparation method comprises the following steps:

210mL of 0.722mol/L sodium metaaluminate solution is transferred to a 500mL beaker, and 12.6g of urea is added to the beaker (n)_NaAlO2：n_CO(NH2)23:7), stirring for 30min by strong magnetic force. And then transferring the mixture into a reaction kettle, reacting for 8h at 150 ℃, naturally cooling to room temperature, filtering and washing, washing for 3 times by using deionized water, and drying for 12h at 60 ℃. And calcining the dried sample at 600 ℃ for 2h, and drying and storing for later use.

Example 2 experiment for adsorbing heavy metals and organic substances

The experimental conditions were: respectively transferring 200mL of 280mg/L sodium arsenate solution and 200mg of rocarsone solution into a 250mL beaker, respectively adding 200mg of composite material, mechanically stirring at the pH value of 6.5, the reaction temperature of 25 ℃ and the rotation speed of 240r/min, sampling at specific time intervals, and filtering with a disposable filter head to be tested.

As shown in figure 1, the adsorption capacity of the composite material to sodium arsenate and rocarsone solution is 103mg/g and 197mg/g respectively within 60 minutes, which shows that the material has strong adsorption capacity to both organic matters and heavy metals.

The adsorption of sodium arsenate reaches the equilibrium in 500min, and the saturated adsorption capacity is 223mg/g, while the adsorption of rocarsone reaches the equilibrium in 300min, and the saturated adsorption capacity is 109 mg/g.

Example 3 Effect of pH on catalytic-adsorption of Luroxarsone

The experimental conditions were: respectively transferring 4 parts of 200mL of 200mg/L rocarsone solution into a 250mL beaker, adjusting the pH to 3, 5, 7 and 8.5, respectively adding 200mg of composite material, respectively adding 1.1mL of 30% hydrogen peroxide solution, mechanically stirring at the rotation speed of 240r/min at the temperature of 25 ℃, sampling at specific time intervals, and filtering with a disposable filter head to be tested.

As shown in fig. 2 and 3, when the pH is 3.21, the TOC (total organic carbon) and arsenic removal rates are the highest, respectively 52.7% and 63.3%, indicating that the removal of roxarsone is greatly affected by the pH.

Example 4 catalytic-adsorption of rocarsone experiments at different concentrations

The experimental conditions were: respectively transferring 200mL of 3.65, 50, 100 and 200mg/L of rocarsone solution into a 250mL beaker, adjusting the pH to 3.21, respectively adding 200mg of composite material, respectively adding 1.1mL of 30% hydrogen peroxide solution, mechanically stirring at the rotation speed of 240r/min at the temperature of 25 ℃, sampling at specific intervals, and filtering with a disposable filter head to be tested.

When the concentration of the roxarsone is 200mg/L, the TOC removal rate of the solution reaches 52.7 percent and the arsenic removal rate reaches 63.3 percent after 240 min. As shown in FIG. 4 and FIG. 5, when the concentration of roxarsone is lower than 100mg/L, the removal rate of arsenic in the solution can reach more than 99%, and the TOC degradation rate is also as high as 99.9%. The removal rate of arsenic and TOC in the roxarsone solution is greatly influenced by the concentration of the substrate when the concentration of the substrate is more than 100mg/L, and is hardly influenced by the concentration of the substrate when the concentration of the substrate is less than 100 mg/L.

Example 5

weighing gamma-Al₂O₃Fully grinding for 10min (gamma-Al)₂O₃Particle size of 4 μm) and then added to FeCl₃·6H₂Introducing nitrogen into the O solution, fully stirring for 30min under the mechanical stirring of the rotating speed of 240r/min, and then dropwise adding NaBH₄Solution (V)_FeCl3·6H2O：V_NaBH41:1) slow first and fast second, the dropping rate being (first) 2mL/min units and (second) 4 mL/min. After the reaction is finished, washing the reaction product for 2 times by using deionized water, then washing the reaction product for 3 times by using absolute ethyl alcohol, and then drying the reaction product in vacuum at the temperature of 40 ℃ to obtain the composite material.

Wherein, gamma-Al₂O₃And Fe³⁺The mass ratio of ionic substances is 1: 12;

Fe³⁺ions with NaBH₄The ratio of the amounts of the substances of (a) to (b) is 1: 10.

Wherein, gamma-Al₂O₃The preparation method comprises the following steps:

Example 6

weighing gamma-Al₂O₃Fully grinding for 10min to gamma-Al₂O₃Is added to FeCl after the particle size of the solution is 4 mu m₃·6H₂Introducing nitrogen into the O solution, fully stirring for 30min under the mechanical stirring of the rotating speed of 240r/min, and then dropwise adding NaBH₄Solution (V)_FeCl3·6H2O：V_NaBH41:1) slow first and fast second, the dropping rate being (first) 2mL/min units and (second) 4 mL/min. After the reaction is finished, washing the mixture for 3 times by using deionized water, then washing the mixture for 2 times by using absolute ethyl alcohol, drying the mixture in vacuum at the temperature of 40 ℃ to obtain the composite material,

wherein, gamma-Al₂O₃And Fe³⁺The mass ratio of ionic substances is 1: 4;

Fe³⁺ions with NaBH₄The ratio of the amounts of the substances of (a) to (b) is 1: 5.

Wherein, gamma-Al₂O₃The preparation method comprises the following steps:

Example 7

weighing gamma-Al₂O₃Fully grinding for 10min to gamma-Al₂O₃After the particle size of (2) is 4 μm, 100ml of 0.1mol/L FeCl is added₃·6H₂Introducing nitrogen into the O solution, fully stirring for 30min under the mechanical stirring of the rotating speed of 240r/min, and then dropwise adding 0.4mol/L NaBH₄Solution (V)_FeCl3·6H2O：V_NaBH41:1) slow first and fast second, the dropping rate being (first) 2mL/min units and (second) 4 mL/min. After the reaction is finished, washing the mixture for 2 times by using deionized water, then washing the mixture for 2 times by using absolute ethyl alcohol, drying the mixture in vacuum at the temperature of 40 ℃ to obtain the composite material,

wherein, gamma-Al₂O₃And Fe³⁺The mass ratio of ionic substances is 1: 8;

Wherein, gamma-Al₂O₃The preparation method comprises the following steps:

the sodium metaaluminate solution was transferred to a 500mL beaker, and urea was added to the beaker (n)_NaAlO2：n_CO(NH2)24:7), stirring for 30min with strong magnetic force. And then transferring the mixture into a reaction kettle, reacting for 8h at 150 ℃, naturally cooling to room temperature, filtering and washing, washing for 3 times by using deionized water, and drying for 12h at 60 ℃. The dried sample is calcined at 700 ℃ for 2h and stored for later use.

Example 8

100mL of FeCl with the concentration of 0.1mol/L is prepared₃·6H₂O solution and 100mL of 0.4mol/LNaBH4 solution (ready for use);

weighing 1.867g of gamma-Al₂O₃Grinding for 10min to obtain gamma-Al₂O₃After the particle size of (2) is 4 μm, 100ml of 0.1mol/L FeCl is added₃·6H₂Introducing nitrogen into the O solution, fully stirring for 30min under the mechanical stirring of the rotating speed of 240r/min, and then dropwise adding 0.4mol/L NaBH₄Solution (V)_FeCl3·6H2O：V_NaBH41:1), the speed is slow firstly and then fast, and the dropping speed is (firstly) 1-2 mL/min unit and (secondly) 3-4 mL/min unit. After the reaction is finished, washing the mixture for 2 times by using deionized water, then washing the mixture for 2 times by using absolute ethyl alcohol, drying the mixture in vacuum at the temperature of 40 ℃ to obtain the composite material,

wherein, gamma-Al₂O₃And Fe³⁺The mass ratio of ionic substances is 1: 10;

Wherein, gamma-Al₂O₃The preparation method comprises the following steps:

the sodium metaaluminate solution was transferred to a 500mL beaker, and urea was added to the beaker (n)_NaAlO2：n_CO(NH2)23:8), stirring with strong magnetic forceStirring for 30 min. And then transferring the mixture into a reaction kettle, reacting for 8h at 150 ℃, naturally cooling to room temperature, filtering and washing, washing for 3 times by using deionized water, and drying for 12h at 60 ℃. The dried sample is calcined at 650 ℃ for 2h and stored dry for later use.

Result detection

For the novel catalyst-adsorbing materials nZVI/gamma-Al prepared in examples 5 to 8₂O₃Carrying out an experiment for adsorbing heavy metals and organic matters, wherein: the adsorption pH value is 6.5, the adsorption time is 240min, mechanical stirring is carried out at the rotating speed of 240r/min, the initial concentration of the roxarsone is 200mg/L, and the initial concentration of the sodium arsenate is 280 mg/L.

The results of the experiment are shown in table 1 below:

TABLE 1

Serial number	Saturated adsorption capacity/mg/g of sodium arsenate	Saturated adsorption capacity/mg/g of rocarsone
			Example 5	230	100
Example 6	229	110
			Example 7	224	115
Example 8	233	119

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The preparation method of the novel catalytic-adsorption material is characterized by comprising the following steps: mixing gamma-Al₂O₃Adding Fe³⁺Introducing inert gas into the ionic solution, stirring uniformly, and adding NaBH₄Solution of Fe³⁺Reducing the iron into nano zero-valent iron, washing and drying to obtain the novel catalytic-adsorption material,

Fe³⁺Ions with NaBH₄The amount ratio of the substance(s) is 1 to 2:8 to 10.

2. The method for preparing the novel catalyst-adsorbing material according to claim 1, wherein γ -Al is₂O₃The particle size of the particles is 2 to 4 μm.

3. The method for preparing the novel catalytic adsorbent material according to claim 1, wherein said γ -Al is selected from the group consisting of₂O₃And Fe³⁺The mass ratio of ionic substances is 1:10, Fe³⁺Ions with NaBH₄The ratio of the amounts of the substances of (a) to (b) is 1: 4.

4. Process for the preparation of the novel catalytic-adsorption material according to claim 2, which is carried out in the presence of a catalystCharacterized in that the gamma-Al₂O₃The preparation method comprises the following steps: uniformly mixing sodium metaaluminate solution and urea, reacting for 8-12 h at 140-150 ℃, washing and drying a reaction product, and calcining for 2-3 h at 600-700 ℃ to obtain gamma-Al₂O₃，

Wherein the mass ratio of sodium metaaluminate to urea is 3-4: 7-8.

5. The method for preparing the novel catalytic adsorption material according to claim 4, wherein the mass ratio of the sodium metaaluminate to the urea is 3:7, the reaction temperature is 150 ℃, the reaction time is 8h, the calcination temperature is 600 ℃, and the calcination time is 2 h.

6. The novel catalytic adsorption material prepared by the preparation method of the novel catalytic adsorption material according to any one of claims 1 to 5, wherein the nano zero-valent iron is uniformly attached to gamma-Al₂O₃The surface and its pore structure.

7. Use of the novel catalytic-adsorbent material according to claim 6 for catalytic oxidation and adsorption of organic compounds.

8. The use of claim 8, wherein the organic material is roxarsone and the initial pH of the adsorbing and catalyzing organic material is 3 to 8.5.

9. Use of the novel catalytic-adsorption material according to claim 7 for the adsorption of heavy metals.

10. The use according to claim 9, wherein the heavy metal is arsenic and the adsorption pH is 3 to 8.5.