CN117101692A - Preparation method and application of nitriding-enriched nano zero-valent iron/biochar composite material - Google Patents

Preparation method and application of nitriding-enriched nano zero-valent iron/biochar composite material Download PDF

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CN117101692A
CN117101692A CN202310637278.9A CN202310637278A CN117101692A CN 117101692 A CN117101692 A CN 117101692A CN 202310637278 A CN202310637278 A CN 202310637278A CN 117101692 A CN117101692 A CN 117101692A
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composite material
valent iron
nano zero
nitriding
nzvi
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CN117101692B (en
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周美春
王恺
高静
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Jiangsu Zhongwu Environmental Protection Industry Development Co ltd
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    • B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/24—Nitrogen compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
    • B01J21/18—Carbon
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
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    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/08—Heat treatment
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    • B01J37/088—Decomposition of a metal salt
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F1/722—Oxidation by peroxides
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    • C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract

The invention discloses a preparation method of a nitriding-enriched nano zero-valent iron/biochar composite material. According to the preparation method for the target material, ferric salt and waste biomass are used as reaction raw materials, and under the condition that no toxic gas containing nitrogen (such as ammonia gas or pyridine and the like) is used, nitridation of nano zero-valent iron and nitrogen doping of biochar can be simultaneously realized through simple one-step pyrolysis, so that the nitriding-rich nano zero-valent iron/biochar composite material (N-nZVI/NBC) is obtained. The method has the advantages of simple preparation process, convenient operation, low requirement on equipment, realization of effective utilization of waste biomass, wide prospect in industrial application and good catalytic activity in catalytic organic matters.

Description

Preparation method and application of nitriding-enriched nano zero-valent iron/biochar composite material
Technical Field
The invention relates to the technical field of material engineering and environmental engineering, in particular to a preparation method of a nitriding-enriched nano zero-valent iron/biochar composite material and application of the nitriding-enriched nano zero-valent iron/biochar composite material in degrading trichloroethylene.
Technical Field
With the increasing industrialization and urban enhancement, the water pollution caused by heavy metals, organic pollutants and other substances is increasingly increased, and the health development of human society is seriously threatened, so that the treatment and repair of the polluted water are very important and urgent. The Nano-zero valent iron (nZVI) has the advantages of strong reducing capability, high reactivity and the like, can degrade and remove common water pollutants through various mechanisms such as reduction, surface complexation, precipitation, catalytic oxidation and the like, and has good application prospect in the aspects of sewage treatment and repair. But nZVI has the disadvantages of easy agglomeration, easy passivation, poor operability and the like. To overcome these disadvantages, various methods have been adopted for modification, such as surface modification, bimetal doping, and vulcanization treatment, wherein the vulcanization treatment has the advantage of improving the reactivity and electron selectivity of nZVI, which is a hot spot in the research field at present, but the method has the disadvantages of short service life, limited antioxidant capacity, and severe preparation and storage conditions, and thus has certain limitations (DOI: 10.1016/j. Watres. 2022.118097). In recent years, researches show that the nitriding treatment of the nZVI can not only improve the reactivity of the nZVI (DOI: 10.1021/acs.est.1c06205) but also improve the corrosion resistance and the reaction life of the nZVI (DOI: 10.1016/j.jhazmat.2020.122764), and the method is a novel potential method for modifying the nZVI.
In addition to the above-described method, the use of the carrier-supported nZVI can further improve the dispersibility of the latter. Among many carrier materials, biochar (BC) is recognized as a good carrier for carrying nZVI due to its advantages of abundant sources, low cost, large specific surface area, high porosity, etc., and doping the Biochar carrier with nitrogen element can further improve the dispersibility and stability of the nZVI/BC composite material.
However, the current common method is to simply Nitrogen dope the BC in the nZVI/BC composite, and the report of not only nitriding nZVI but also simultaneously Nitrogen doping the BC to produce a nitrided nZVI/BC composite (Nitrogen-enriched nZVI/BC, N-nZVI/BC) is very rare. Furthermore, the procedures for preparing this class of nitrided rich materials have been reported to be very cumbersome and generally involve the use of toxic gases such as ammonia (DOI: 10.1021/acs. Est. 1c08182.; DOI:10.1039/C7RA 08704G.) or pyridine gases (DOI: 10.1039/D1TA 0246A.). Meanwhile, most existing ways for doping nitrogen into biochar are to use melamine, amino acid and other high-cost nitrogen sources to carry out external doping on the biochar, and few N-nZVI/BC material preparation methods for carrying out nitrogen doping by using nitrogen-rich biomass as an internal nitrogen source are adopted. To our knowledge, there is no report of simultaneously achieving nitrogen doping of biochar and partial nitridation of nZVI under milder and more environmentally friendly conditions without using toxic gases. And the nano zero-valent iron composite material reported in the current literature usually needs additional oxidant such as hydrogen peroxide, persulfate and the like to realize effective degradation of pollutants.
In view of this, the present invention aims to provide a simple method for preparing an N-nZVI/NBC composite material by one-step pyrolysis using a suitable iron source and waste biomass raw material. The method can simultaneously complete nitriding of nZVI and nitrogen doping of BC, does not involve the use of any toxic gas, effectively utilizes waste biomass, and can improve the performance of biochar by co-pyrolysis of two selected waste biomasses.
Disclosure of Invention
The invention aims at simultaneously completing nitriding of nZVI and nitrogen doping of BC (N-nZVI/NBC) without any toxic gas and without adopting high-cost nitrogen source.
The invention also aims to provide an application of the N-nZVI/NBC composite material in catalytic degradation of organic matters.
In order to achieve the purpose of the invention, the technical scheme adopted is as follows:
the invention provides a preparation method of an N-nZVI/NBC composite material, which comprises the following steps:
(1) Cleaning the waste tea leaves and algae, and then putting the cleaned waste tea leaves and algae into a baking oven at 40-100 ℃ for overnight baking.
(2) Taking the dried waste tea leaves and algae plants, crushing the waste tea leaves and the algae plants by a crusher, screening the crushed waste tea leaves and the crushed algae plants by a checking screen, and taking the screened waste tea powder and the screened algae plant powder.
(3) Weighing proper amount of potassium ferrate, algae plant powder and waste tea powder, placing into a mortar, grinding for 20-50min, and fully mixing the three substances. Potassium ferrate, algae plant powder and waste tea powder are mixed according to the mass ratio of 1:1:1-1:5:10.
(4) And (3) placing the mixture obtained in the step (3) into a quartz boat, and then placing the quartz boat into a tube furnace. Firstly, introducing nitrogen into a tube furnace, then raising the temperature to 40-100 ℃ at a heating rate of 3-5 ℃/min, and keeping the temperature for 40-60min to dehumidify and deoxidize.
(5) Then the temperature is increased to 500-700 ℃ at the heating rate of 3-5 ℃/min, and the temperature is kept for 3-5h under the condition of nitrogen protection.
(6) The product was then cooled to room temperature, washed and dried overnight in a vacuum oven to give an N-nZVI/NBC composite.
Further, the temperature of the oven in step (1) is preferably 90-100 ℃.
Further, the preferred mass ratio of potassium ferrate, algae powder and waste tea powder in step (3) is 1:1:1 to 1:5:1. Preferably, the milling time is 20-35min.
In a second aspect, the invention provides a method of preparing an N-nZVI/NBC composite material as described above.
In a third aspect, the invention provides the use of an N-nZVI/NBC composite material that can be directly used for the reductive degradation of TCE.
The prepared N-nZVI/NBC composite material is added into a liquid containing Trichloroethylene (TCE), and the mixture is put into a shaking table to start reaction at normal temperature and normal pressure. The removal rate of Trichloroethylene (TCE) (20 mg/L) reaches 90% in 1 h.
The invention does not need the addition of oxidizing agents such as hydrogen peroxide, persulfate and the like. The known catalyst of nitrided zero-valent iron, zero-valent iron material and the like directly reduces and degrades TCE with the same concentration to reach the same degradation rate for a long time, which is about two days and twenty days (doi: 10.1021/acs.est.1c0882) respectively, and the material of the invention has obvious degradation superiority in TCE removal.
The preparation method of the N-nZVI/NBC composite material has the technical advantages that:
(1) The method does not involve the use of toxic gases such as ammonia gas and the like, can realize nitriding of nZVI and nitrogen doping of BC simultaneously, and is very efficient and environment-friendly in process;
(2) The method has the advantages of few process steps, simple operation and lower raw material cost; the N-nZVI/NBC composite material prepared by the method can be directly used for degrading trichloroethylene which is a common organic pollutant in water, and the removal rate of TCE reaches 90% within 1 h.
Drawings
FIG. 1 is an XRD pattern of the N-nZVI/NBC composite material prepared in example 1.
FIG. 2 is a FTIR chart of the biochar material prepared under the same calcination conditions as in example 1, wherein the N-nZVI/NBC composite material prepared in example 1 and the waste tea powder were prepared.
FIG. 3 is a FTIR of the N-nZVI/NBC composite material prepared in example 2.
FIG. 4 is a FTIR of an N-nZVI/NBC composite material prepared in example 3.
FIGS. 5-7 are SEM images of the N-nZVI/NBC composite material prepared in example 1 at various magnifications.
FIG. 8 is an XRD pattern of the N-nZVI/NBC composite material prepared in example 2.
FIG. 9 is an XRD pattern of the N-nZVI/NBC composite material prepared in example 3.
FIG. 10 is an XRD pattern of the N-nZVI/NBC composite material prepared in example 4.
FIG. 11 is a pair ofProportion 1 Fe prepared 3 XRD pattern of N/C composite.
FIG. 12 is an XRD pattern of the Fe/C composite material prepared in comparative example 2.
FIG. 13 is a view showing the Fe-Fe film obtained in comparative example 3 4 XRD pattern of N/C composite.
FIG. 14 is a graph showing the degradation kinetics of a commercially available nano zero valent iron (nZVI) to a TCE solution having an initial concentration of 20mg/L for the N-nZVI/NBC composite material prepared in example 1 and NBC material prepared without iron source.
Detailed description of the preferred embodiments
For the purposes of promoting an understanding of the principles and advantages of the invention, reference will now be made to the drawings and specific examples, together with the description of the invention and its specific examples, it will be understood that the specific examples are illustrated in the drawings and are not intended to limit the invention to the particular forms disclosed, but are not to be all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are within the scope of the invention.
The experimental methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials, unless otherwise specified, are commercially available.
Example 1
(1) Waste tea leaves and algae plants are taken for cleaning, and then put into a baking oven at 40 ℃ for drying overnight.
(2) Taking a plurality of dried waste tea leaves and a plurality of algae plants, crushing the waste tea leaves and the algae plants by a crusher, screening the crushed waste tea leaves and the algae plants by a checking screen, and taking screened waste tea powder and algae plant powder.
(3) Potassium ferrate, algae plant powder and waste tea powder are mixed according to the following ratio of 1:1:1, and grinding the mixture in a mortar for 20min to fully mix the three substances.
(4) And (3) placing the mixture obtained in the step (3) into a quartz boat, and then placing the quartz boat into a tube furnace. Nitrogen was first introduced into the tube furnace, heated to 40 ℃ at a heating rate of 3 ℃/min, and maintained at that temperature for 40min to dehumidify and remove oxygen.
(5) Then the temperature was raised to 500℃at a heating rate of 3℃per minute, and the mixture was kept at that temperature under nitrogen for 3 hours.
(6) And then cooling to room temperature to obtain the N-nZVI/NBC composite material.
Example 2
(1) Waste tea leaves and algae plants are taken for cleaning, and then put into a baking oven at 40 ℃ for drying overnight.
(2) Taking a plurality of dried waste tea leaves and a plurality of algae plants, crushing the waste tea leaves and the algae plants by a crusher, screening the crushed waste tea leaves and the algae plants by a checking screen, and taking screened waste tea powder and algae plant powder.
(3) Potassium ferrate, algae plant powder and waste tea powder are mixed according to the following ratio of 1:5:1, and grinding for 20min to fully mix the three substances.
(4) And (3) placing the mixture obtained in the step (3) into a quartz boat, and then placing the quartz boat into a tube furnace. Nitrogen is introduced into the tube furnace, and the temperature is raised to 40 ℃ at a heating rate of 3 ℃/min, and the tube furnace is kept at the temperature for 40min to dehumidify and deoxidize.
(5) Then the temperature is raised to 500 ℃ at a heating rate of 3 ℃/min, and the reaction is carried out for 3 hours under the condition of the temperature and nitrogen.
(6) And then cooling to room temperature to obtain the N-nZVI/NBC composite material.
Example 3
(1) Waste tea leaves and algae plants are taken for cleaning, and then put into a baking oven at 40 ℃ for drying overnight.
(2) Taking a plurality of dried waste tea leaves and a plurality of algae plants, crushing the waste tea leaves and the algae plants by a crusher, screening the crushed waste tea leaves and the algae plants by a checking screen, and taking screened waste tea powder and algae plant powder.
(3) Potassium ferrate, algae plant powder and waste tea powder are mixed according to the following ratio of 1:3:10, and grinding the mixture in a mortar for 20min to mix the three materials thoroughly.
(4) And (3) placing the mixture obtained in the step (3) into a quartz boat, and then placing the quartz boat into a tube furnace. Nitrogen is firstly introduced into the tube furnace, the temperature is raised to 40 ℃ at the heating rate of 3 ℃/min, and the temperature lasts for 40min, so that dehumidification and deoxidation are carried out.
(5) Then the temperature is raised to 500 ℃ at a heating rate of 3 ℃/min, and the reaction is carried out for 3 hours under the condition of the temperature and nitrogen.
(6) And then cooling to room temperature to obtain the N-nZVI/NBC composite material.
Example 4
(1) Waste tea leaves and algae plants are taken for cleaning, and then put into a baking oven at 100 ℃ for drying overnight.
(2) Taking a plurality of dried waste tea leaves and a plurality of algae plants, crushing the waste tea leaves and the algae plants by a crusher, screening the crushed waste tea leaves and the algae plants by a checking screen, and taking screened waste tea powder and algae plant powder.
(3) Potassium ferrate, algae, and waste tea powder were mixed according to 1:1:1, and grinding for 50min to fully mix the three substances.
(4) Placing the mixture obtained in the step (3) into a quartz boat, and placing the quartz boat into a tube furnace. Nitrogen is first introduced into the tube furnace, heated to 100 ℃ at a heating rate of 5 ℃/min, and maintained at that temperature for 60 minutes to dehumidify and remove oxygen.
(5) Then the temperature is raised to 700 ℃ at a heating rate of 3 ℃/min, and the reaction is carried out for 5 hours under the condition of the temperature and nitrogen.
(6) And then cooling to room temperature to obtain the N-nZVI/NBC composite material.
Comparative example 1
(1) The algae are taken out for cleaning, and then put into a baking oven at 40 ℃ for drying overnight.
(2) Taking a plurality of algae, crushing the algae by a crusher, screening the crushed algae by a check screen, and taking screened algae powder.
(3) Potassium ferrate was mixed with algae according to 1:1, and grinding the materials in a mortar for 20min to fully mix the materials.
(4) And (3) placing the mixture obtained in the step (3) into a quartz boat, and then placing the quartz boat into a tube furnace. Nitrogen was first introduced into the tube furnace, heated to 40 ℃ at a heating rate of 3 ℃/min, and maintained at that temperature for 40min to dehumidify and remove oxygen.
(5) Then, the temperature was raised to 500℃at a heating rate of 3℃per minute, and the mixture was kept at that temperature for 3 hours.
(6) Then cooled to room temperature to obtain Fe 3 N/C composite material.
Comparative example 2
(1) The waste tea leaves are taken, cleaned and then put into a baking oven at 40 ℃ for drying overnight.
(2) Taking a plurality of dried waste tea leaves, crushing the waste tea leaves by a crusher, screening the crushed waste tea leaves by a screening sieve, and taking screened waste tea powder.
(3) Potassium ferrate and waste tea powder are mixed according to the following proportion of 1:1, and grinding the materials in a mortar for 20min to fully mix the materials.
(4) And (3) placing the mixture obtained in the step (3) into a quartz boat, and then placing the quartz boat into a tube furnace. Nitrogen was first introduced into the tube furnace, heated to 40 ℃ at a heating rate of 3 ℃/min, and maintained at that temperature for 40min to dehumidify and remove oxygen.
(5) Then the temperature was raised to 500℃at a heating rate of 3℃per minute, and the mixture was kept at that temperature under nitrogen for 4 hours.
(6) And then cooling to room temperature to obtain the Fe/C composite material.
Comparative example 3
(1) Taking waste tea leaves, and then putting the waste tea leaves into a baking oven at 40 ℃ for drying overnight.
(2) Taking a plurality of dried waste tea leaves, screening the dried waste tea leaves by a checking screen used after crushing the dried waste tea leaves by a crusher, and taking screened waste tea powder.
(3) Potassium ferrate and waste tea powder are mixed according to the following proportion of 1:5, weighing the materials according to the mass ratio, and putting the materials into a mortar for grinding for 20min to fully mix the materials.
(4) And (3) placing the mixture obtained in the step (3) into a quartz boat, and then placing the quartz boat into a tube furnace. Nitrogen was first introduced into the tube furnace, heated to 40 ℃ at a heating rate of 3 ℃/min, and maintained at that temperature for 40min to dehumidify and remove oxygen.
(5) Then the temperature was raised to 500℃at a heating rate of 3℃per minute, and the mixture was kept at that temperature under nitrogen for 4 hours.
(6) Then cooled to room temperature to obtain Fe-Fe 4 N/C composite material.
The phase composition, the microscopic morphology and the like of the prepared N-nZVI/NBC are characterized by adopting a Fourier infrared spectrometer (FTIR), an X-ray diffractometer (XRD), a field emission Scanning Electron Microscope (SEM) and the like.
The main difference between examples 1,2,3 is the mass ratio between the reaction materials, and the main difference between examples 1 and 4 is the maximum calcination temperature employed. From fig. 1, 8, 9 and 10, the nZVI in the composite materials prepared in the above examples were nitrided. Comparing fig. 1, 8, 9 and 10, it was found that the mass ratio of the reaction raw materials had less influence on the composition of the product N-nZVI/NBC composite material, and that the nitriding degree of nZVI in the N-nZVI/NBC composite material was reduced after the reaction temperature was increased. The presence of the C-N telescopic vibration absorption peaks in FIGS. 2,3, and 4 indicates that BC in the prepared composite is nitrogen doped. The above results indicate that the material prepared is an N-nZVI/NBC composite. FIGS. 5-7 show that BC in the N-nZVI/NBC composite has a rich pleat and pore structure, which is advantageous for materials with large specific surface areas. It can also be seen from FIGS. 5-7 that nZVI particles in the 10-50 nm range do not exhibit substantial packing and are distributed relatively uniformly throughout BC.
The XRD patterns of comparative examples 1-3 are shown in FIGS. 11-13, respectively. Comparative example 1 shows that when algae alone is used, no N-nZVI/NBC composite material can be obtained under the same conditions, and only a composite material of iron nitride and biochar can be obtained. In comparative examples 2 and 3, only waste tea with strong reducibility is adopted, and when the consumption of the waste tea is insufficient, partial nitridation of nZVI cannot be realized, so that the necessity of combined use of the two biomasses is further demonstrated.
The method for directly degrading TCE by the N-nZVI/NBC composite material prepared in the example 1 is as follows:
three different brown Erlenmeyer flasks were taken, 40mg of nZVI, NBC and the N-nZVI/NBC composite material prepared in example 1 were added thereto, respectively, and 20mL of deionized water was added thereto; then, 216uL of TCE liquid with the concentration of 1.85g/L was injected thereinto to make the initial concentration of the prepared TCE solution 20mg/L, the added material (nZVI, NBC, N-nZVI/NBC) in the TCE solution 2g/L, then the mixture was put into a shaker to start the reaction at normal temperature and normal pressure, 3mL of water samples were taken therefrom at 10min,30min and 60min respectively, the water samples were filtered by a 0.22um filter and then subjected to headspace gas chromatography mass spectrometry to detect the content of residual TCE, and the degradation kinetics of TCE was as shown in FIG. 14.
FIG. 14 is a graph showing degradation kinetics of a commercially available nano zero valent iron (nZVI) purchased on an Ala Ding Shiji purchasing platform to a TCE solution having an initial concentration of 20mg/L, using the N-nZVI/NBC composite material prepared in example 1, the NBC material prepared without the iron source under the same conditions as in example 1, respectively. The graph shows that the N-nZVI/NBC composite material can directly and effectively reduce and degrade TCE, and can reach 90% removal rate in 1 hour, and the degradation rate of NBC and nZVI to TCE in 1 hour is less than 30%, so that the degradation rate of N-nZVI/NBC composite material to TCE is far higher than that of NBC and nZVI. The nano zero-valent iron composite material reported in the literature generally needs additional oxidant such as hydrogen peroxide, persulfate and the like to realize effective degradation of pollutants. Furthermore, in few reports on iron nitride, nano zero-valent iron materials, in the case of direct reductive degradation of TCE, two days and twenty days of time (doi: 10.1021/acs.est.1c08182) were required to achieve the same removal efficiency for the same initial concentration of TCE, respectively, demonstrating that our materials have significant degradation performance superiority.
The foregoing description is only of preferred embodiments of the invention and is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims (7)

1. The preparation method of the nitriding-enriched nano zero-valent iron/biochar composite material is characterized by comprising the following steps of:
(1) Cleaning tea and algae, oven drying, pulverizing, and sieving to obtain tea powder and algae powder;
(2) Weighing potassium ferrate, mixing and grinding algae powder and tea powder according to a mass ratio of 1:1:1-1:5:10, fully mixing, putting into a quartz boat, placing into a tube furnace, and heating the tube furnace under the protection of nitrogen to dehumidify and deoxidize;
(3) And heating the tubular furnace to 500-700 ℃, reacting at the temperature, cooling to room temperature, washing, and drying to obtain the nitriding-enriched nano zero-valent iron/biochar composite material, and counting N-nZVI/NBC.
2. The method for preparing the nitriding-enriched nano zero-valent iron/biochar composite material according to claim 1, which is characterized in that: the mass ratio of the potassium ferrate to the algae plant powder to the tea powder is 1:1:1-1:5:1, and the grinding time is 20-50 min.
3. The method for preparing the nitriding-enriched nano zero-valent iron/biochar composite material according to claim 1, which is characterized in that: and (3) heating the tubular furnace in the step (2) and the step (3) at a heating rate of 3-5 ℃/min.
4. The method for preparing the nitriding-enriched nano zero-valent iron/biochar composite material according to claim 1, which is characterized in that: the temperature for dehumidifying and deoxidizing is 40-100 ℃.
5. The method for preparing the nitriding-enriched nano zero-valent iron/biochar composite material according to claim 1, which is characterized in that: and (3) reacting for 3-5h at 500-700 ℃.
6. A nitrided nano zero valent iron/biochar composite material prepared according to the method of any one of claims 1-5.
7. Use of the nitrided nano zero valent iron/biochar rich composite material prepared according to any one of the claims 1-5 as a catalyst for the degradation of trichloroethylene.
CN202310637278.9A 2023-04-27 2023-05-31 Preparation method and application of nitriding-enriched nano zero-valent iron/biochar composite material Active CN117101692B (en)

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