CN111495349A - Modified biomass charcoal catalyst based on activated sludge and preparation method thereof - Google Patents
Modified biomass charcoal catalyst based on activated sludge and preparation method thereof Download PDFInfo
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- 239000002028 Biomass Substances 0.000 title claims abstract description 73
- 239000010802 sludge Substances 0.000 title claims abstract description 67
- 239000003610 charcoal Substances 0.000 title claims abstract description 61
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000003054 catalyst Substances 0.000 title claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 22
- 238000000197 pyrolysis Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000007873 sieving Methods 0.000 claims abstract description 16
- 230000003197 catalytic effect Effects 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000000227 grinding Methods 0.000 claims abstract description 8
- 230000007935 neutral effect Effects 0.000 claims abstract description 8
- 229910004664 Cerium(III) chloride Inorganic materials 0.000 claims abstract description 6
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims abstract description 4
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims abstract description 3
- 239000012299 nitrogen atmosphere Substances 0.000 claims abstract description 3
- 238000005406 washing Methods 0.000 claims abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 239000003344 environmental pollutant Substances 0.000 claims description 8
- 231100000719 pollutant Toxicity 0.000 claims description 8
- 239000012467 final product Substances 0.000 claims description 7
- 238000002791 soaking Methods 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 5
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 238000006731 degradation reaction Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000004048 modification Effects 0.000 claims description 2
- 238000012986 modification Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 6
- 239000002910 solid waste Substances 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract description 2
- 229910002249 LaCl3 Inorganic materials 0.000 abstract 1
- VYLVYHXQOHJDJL-UHFFFAOYSA-K cerium trichloride Chemical compound Cl[Ce](Cl)Cl VYLVYHXQOHJDJL-UHFFFAOYSA-K 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 238000004108 freeze drying Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 14
- 239000010865 sewage Substances 0.000 description 9
- 238000007598 dipping method Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 description 4
- 244000000010 microbial pathogen Species 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- VCUVETGKTILCLC-UHFFFAOYSA-N 5,5-dimethyl-1-pyrroline N-oxide Chemical compound CC1(C)CCC=[N+]1[O-] VCUVETGKTILCLC-UHFFFAOYSA-N 0.000 description 1
- 238000004435 EPR spectroscopy Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 238000003421 catalytic decomposition reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000149 chemical water pollutant Substances 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000035558 fertility Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- -1 hydroxyl free radical Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 238000010525 oxidative degradation reaction Methods 0.000 description 1
- 244000045947 parasite Species 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- 239000008055 phosphate buffer solution Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- 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
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0201—Impregnation
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/082—Decomposition and pyrolysis
- B01J37/084—Decomposition of carbon-containing compounds into carbon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
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- Chemical & Material Sciences (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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- Environmental & Geological Engineering (AREA)
- Catalysts (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention belongs to the technical field of environmental protection, and particularly relates to a modified biomass charcoal catalyst based on activated sludge and a preparation method thereof. The method comprises the following steps: (1) sorting and freeze-drying the activated sludge, and powdering and sieving the dried activated sludge; (2) immersing powdered activated sludge in a modifying solution such as FeCl3、CeCl3、LaCl3Then filtering and drying to obtain impregnated activated sludge; (3) carrying out anaerobic pyrolysis treatment on the impregnated activated sludge in a nitrogen atmosphere, controlling the heating rate and the constant-temperature pyrolysis time, and cooling to room temperature after pyrolysis is finished to obtain biomass charcoal prepared from activated sludge; (4) putting the biomass charcoal into a ball mill for grindingGrinding, sieving, washing with water until the pH value is neutral, and drying to obtain the product biomass charcoal. The method has the advantages of simple process and short time consumption, and the prepared modified biomass charcoal has good catalytic performance and stable effect, and realizes the recycling of solid wastes.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a solid waste resource utilization and pollutant degradation catalyst and a preparation method thereof, in particular to a modified biomass charcoal catalyst based on activated sludge and a preparation method thereof.
Background
The activated sludge process is the core method for purifying urban sewage at present, and with the acceleration of the urbanization process, a sewage treatment plant is also constructed rapidly, a large amount of Waste Activated Sludge (WAS) can be generated in the operation process of the sewage treatment plant, the yield of the activated sludge per year in China reaches 40 hundred million tons (the water content is 80%), the occupied area is large, the potential environmental risk is realized, the disposal cost is high, and the operation cost of the sewage treatment plant is improved. Therefore, the reasonable handling of WAS and the acquisition of corresponding resources therefrom are the main content of current research.
WAS contains a large amount of organic substances, such as protein, carbohydrate, pathogenic microorganisms and the like, so that the selection of a proper treatment method is important. Although many disposal techniques, such as incineration, composting, landfill disposal, etc., can kill pathogenic microorganisms and parasites, these techniques inevitably cause secondary pollution, such as the incineration generates dioxin to pollute air, the landfill disposal occupies a large amount of land resources, and the generated landfill leachate pollutes groundwater. WAS pyrolysis, which is a thermochemical process in which raw materials are heated at high temperatures under anaerobic conditions, is considered as the most promising disposal method, can effectively kill pathogenic microorganisms, reduce the volume of sludge, cause little secondary pollution, and can obtain a resource-based product, biomass char.
As a novel carbon-rich solid material, the biomass charcoal has great utilization value in environmental protection and production life, and has larger specific surface area, porous stable structure and abundant surfaceEnergy clusters have been used in sewage adsorption treatment and agricultural production activities. However, the application of biochar to sewage adsorption only completes the transfer process of pollutants, and the subsequent researches on soil improvement and soil fertility increase in agriculture only remain on the aspects of properties and discussion of performances. In recent years, research on the use of biomass charcoal for catalytic decomposition of pollutants has been focused due to the production of Persistent Free Radicals (PFRs) during pyrolysis, wherein PFRs are considered to be good activators for catalyzing H2O2OH is produced, which makes it capable of significantly catalyzing the decomposition of pollutants. According to the invention, the modified solution is used for dipping the activated sludge, and the modified biomass charcoal obtained by pyrolyzing the modified activated sludge can show more excellent catalytic performance and stronger stability.
Disclosure of Invention
The invention aims to provide an efficient, stable and safe modified biomass charcoal catalyst based on activated sludge and a preparation method thereof.
The invention provides a preparation method of a modified biomass charcoal catalyst based on activated sludge, which comprises the following specific steps:
A. sorting the activated sludge to remove impurity solids which cannot be decomposed;
B. drying activated sludge, crushing the dried activated sludge by using a crusher, and sieving to prepare powdery activated sludge;
C. soaking the powdery activated sludge in 0.05-0.1 mol/L modified solution for 2-3h, filtering and drying to obtain the soaked powdery activated sludge;
D. placing the impregnated powdered activated sludge in a vacuum tube furnace, and carrying out anaerobic pyrolysis in a nitrogen atmosphere; after the pyrolysis is finished, the temperature is recovered to the room temperature to obtain modified biomass charcoal;
E. and (3) placing the modified biomass charcoal in a roller ball mill for grinding, washing with water until the pH value is neutral, and then drying and sieving to obtain the modified biomass charcoal with the efficient catalytic effect.
Preferably, in the step B, drying in a drying device at the temperature of 60-70 ℃ for 60-72 h; sieving the activated sludge by a sieve with 40-60 meshes.
Preferably, in the step C, the modifying solution is FeCl3、CeCl3Or L aCl3The concentration of the modified solution is 0.1 mol/L, and 10-12g of powdered activated sludge is soaked in each 100m of modified solution L.
Preferably, in the step D, the constant temperature pyrolysis temperature is 400-.
Preferably, in the step E, the grinding rate of the modified biomass charcoal is 400-600 r/min; the large, medium and small spherulites are matched according to the proportion of 10-15 percent, 30-35 percent and 20-25 percent of the total mass; and repeatedly cleaning the ball-milled modified biomass carbon in deionized water until the pH value is neutral, placing the ball-milled modified biomass carbon in an oven at 50-70 ℃ until the ball-milled modified biomass carbon is dried, and then sieving the dried modified biomass carbon through a 120-140-mesh sieve to obtain the final product.
In another aspect of the invention, a modified biomass charcoal, which is a final product prepared by the above preparation method, is provided.
On the other hand, the final product modified biomass charcoal can be used for catalyzing the degradation of pollutants and realizing the resource utilization of solid wastes.
The invention has the beneficial effects that:
A. the activated sludge belongs to solid waste, the raw materials are cheap and easy to obtain, and the waste treatment and resource utilization can be realized simultaneously;
B. the method adopts an impregnation method for modification, does not need other operations, has mature technology, adopts anaerobic pyrolysis to produce modified biomass charcoal, and has low energy consumption and less secondary pollution;
C. the modified biomass charcoal provided by the invention has the advantages of stable performance, good catalytic effect and far higher catalytic effect than that of unmodified biomass charcoal.
Drawings
FIG. 1 is FeCl at 0.1 mol/L used in example 13Modified biomass charcoal pair H prepared by dipping modified solution2O2The catalytic effect of (3).
FIG. 2 shows the results obtained in example 2 with 0.1 mol/L of CeCl3Modified biomass charcoal pair H prepared by dipping modified solution2O2The catalytic effect of (3).
FIG. 3 is L aCl at 0.1 mol/L for example 33Modified biomass charcoal pair H prepared by dipping modified solution2O2The catalytic effect of (3).
Detailed Description
The present invention will be further described with reference to the following specific examples, but the present invention is not limited thereto, and since the activated sludge and the pollutant properties and concentrations differ from one area to another, the relevant parameters of the present invention can be appropriately adjusted without departing from the spirit of the present invention and the scope of the appended claims. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any inventive step belong to the protection scope of the present invention.
Example 1
The preparation method of the modified biomass charcoal by taking the activated sludge generated by a certain sewage treatment plant in Shanghai city comprises the following steps:
A. sorting the activated sludge, and selecting impurity solids which cannot be decomposed;
B. drying the activated sludge in a drying oven at the temperature of 60 ℃ for 72h, crushing the dried activated sludge by using a crusher, and then sieving by using a 40-mesh sieve to obtain powdery activated sludge;
C. immersing powdered activated sludge in 0.1 mol/L FeCl3Soaking about 10 g of powdered activated sludge in 100m of L modified solution for 2 hours, filtering, and drying in a 60 ℃ oven to obtain soaked powdered activated sludge;
D. placing the impregnated powdered activated sludge in a vacuum tube furnace, carrying out pyrolysis at a constant temperature of 400 ℃, heating for 30min, carrying out pyrolysis at the constant temperature of 120 min, carrying out nitrogen flow at a flow rate of 7L/min, and taking out the modified biomass charcoal when the temperature is reduced to room temperature after pyrolysis is finished;
E. grinding the modified biomass charcoal in a roller ball mill, wherein the rotation speed of the ball mill is 400 r/min; the large, medium and small spherulites are matched according to the proportion of 15 percent, 35 percent and 25 percent of the total mass; and repeatedly cleaning the ball-milled modified biomass charcoal in deionized water until the pH value is neutral, placing the ball-milled modified biomass charcoal in a 50 ℃ oven until the ball-milled modified biomass charcoal is dried, and then sieving the dried modified biomass charcoal with a 120-mesh sieve to obtain the final product modified biomass charcoal.
Example 2
The preparation method of the modified biomass charcoal by taking the activated sludge generated by a certain sewage treatment plant in Shanghai city comprises the following steps:
A. sorting the activated sludge, and selecting impurity solids which cannot be decomposed;
B. drying the activated sludge in a drying oven at the temperature of 70 ℃ for 60 h, crushing the dried activated sludge by a crusher, and then sieving by a 50-mesh sieve to obtain powdery activated sludge;
C. the powdered activated sludge was immersed in 0.1 mol/L CeCl3Soaking about 11 g of powdered activated sludge in 100m of L modified solution for 2 hours, filtering, and drying in a 70 ℃ oven to obtain soaked powdered activated sludge;
D. placing the impregnated powdered activated sludge in a vacuum tube furnace, carrying out pyrolysis at a constant temperature of 400 ℃, heating for 30min, carrying out pyrolysis at the constant temperature of 150 min, carrying out nitrogen flow at 6L/min, and taking out the modified biomass charcoal when the temperature is reduced to room temperature after pyrolysis is finished;
E. grinding the modified biomass charcoal in a roller ball mill, wherein the rotation speed of the ball mill is 500 r/min; the large, medium and small spherulites are matched according to the proportion of 13 percent, 33 percent and 23 percent of the total mass; and repeatedly cleaning the ball-milled modified biomass charcoal in deionized water until the pH value is neutral, placing the ball-milled modified biomass charcoal in a 60 ℃ drying oven until the ball-milled modified biomass charcoal is dried, and then sieving the dried modified biomass charcoal with a 130-mesh sieve to obtain the final product modified biomass charcoal.
Example 3
The preparation method of the modified biomass charcoal by taking the activated sludge generated by a certain sewage treatment plant in Shanghai city comprises the following steps:
A. sorting the activated sludge, and selecting impurity solids which cannot be decomposed;
B. drying the activated sludge in a drying oven at the temperature of 70 ℃ for 60 h, crushing the dried activated sludge by a crusher, and then sieving by a 60-mesh sieve to obtain powdery activated sludge;
C. dipping the powder activated sludge in L aCl of 0.1 mol/L3Soaking about 12g of powdered activated sludge in 100m of L modified solution for 2 hours, filtering, and drying in a 70 ℃ oven to obtain soaked powdered activated sludge;
D. placing the impregnated powdered activated sludge in a vacuum tube furnace, carrying out pyrolysis at a constant temperature of 400 ℃, heating for 30min, carrying out pyrolysis at the constant temperature of 150 min, carrying out nitrogen flow at 7L/min, and taking out the modified biomass charcoal when the temperature is reduced to room temperature after pyrolysis is finished;
E. grinding the modified biomass charcoal in a roller ball mill, wherein the rotation speed of the ball mill is 600 r/min; the large, medium and small spherulites are matched according to the proportion of 10 percent, 30 percent and 20 percent of the total mass; and repeatedly cleaning the ball-milled modified biomass charcoal in deionized water until the pH value is neutral, placing the ball-milled modified biomass charcoal in a 70 ℃ drying oven until the ball-milled modified biomass charcoal is dried, and then sieving the dried modified biomass charcoal with a 140-mesh sieve to obtain the final product modified biomass charcoal.
In order to investigate the modified biomass charcoal on H2O2The following experiments were performed:
5 mg of unmodified sludge biomass charcoal and the modified biomass charcoal of the embodiment 1, the embodiment 2 and the embodiment 3 are respectively added into 4 m L phosphate buffer solution, and after complete mixing, H is rapidly added2O2(final concentration 5 mM), hydroxyl radical was detected by Electron Spin Resonance (ESR) using DMPO as a trapping agent, and the results after the experiment were shown in FIGS. 1, 2, and 3:
as can be seen from the figure, each experiment is obviously examined through the catalytic action of the biomass charcoalThe signal of the hydroxyl radical is measured (the peak with the signal intensity of 1:2:2:1 is a hydroxyl radical peak diagram), the hydroxyl radical has strong oxidizability and can be used for the oxidative degradation of pollutants, namely each group of experiments can show that the modified biomass charcoal has the potential of being used as a catalyst, and the modified biomass charcoal impregnated by the modified solution is found to be used for catalyzing H through comparison with a blank group2O2The strength of the generated hydroxyl free radical is greatly improved, wherein FeCl is used3Solution impregnation of modified biomass charcoal showed optimal catalytic performance, followed by CeCl3And L aCl3Solution impregnated modified biomass char. The invention can select a proper modification method aiming at the practical application condition, and the three embodiments have excellent catalytic performance, thereby not only realizing reasonable treatment and disposal of solid wastes, but also providing a safe, efficient and stable recycling technology.
Claims (7)
1. A preparation method of modified biomass charcoal based on activated sludge is characterized by comprising the following specific steps:
A. sorting the activated sludge to remove impurity solids which cannot be decomposed;
B. drying activated sludge, crushing the dried activated sludge by using a crusher, and sieving to prepare powdery activated sludge;
C. soaking the powdery activated sludge in 0.05-0.1 mol/L modified solution for 2-3h, filtering and drying to obtain the soaked powdery activated sludge;
D. placing the impregnated powdered activated sludge in a vacuum tube furnace, and carrying out anaerobic pyrolysis in a nitrogen atmosphere; after the pyrolysis is finished, the temperature is recovered to the room temperature to obtain modified biomass charcoal;
E. and (3) placing the modified biomass charcoal in a roller ball mill for grinding, washing with water until the pH value is neutral, and then drying and sieving to obtain the modified biomass charcoal with the efficient catalytic effect.
2. The preparation method according to claim 1, wherein in the step B, the mixture is dried in a drying device at the temperature of 60-70 ℃ for 60-72 h; sieving the activated sludge by a sieve with 40-60 meshes.
3. The method according to claim 1, wherein in step C, the modifying solution is FeCl3、CeCl3Or L aCl3And soaking 10-12g of powdered activated sludge in each 100m of the modification solution of L.
4. The method as claimed in claim 1, wherein in step D, the temperature of the constant temperature pyrolysis is 400-500 ℃, the temperature rise time is 30-60 min, the time of the constant temperature pyrolysis is 120-180 min, and the flow rate of nitrogen is controlled to be 5-7L/min.
5. The preparation method as claimed in claim 1, wherein in step E, the grinding rate of the modified biomass charcoal is 400-; the large, medium and small spherulites are matched according to the proportion of 10-15 percent, 30-35 percent and 20-25 percent of the total mass; and repeatedly cleaning the ball-milled modified biomass carbon in deionized water until the pH value is neutral, placing the ball-milled modified biomass carbon in an oven at 50-70 ℃ until the ball-milled modified biomass carbon is dried, and then sieving the dried modified biomass carbon through a 120-140-mesh sieve to obtain the final product.
6. Modified biomass char obtained by the production method according to any one of claims 1 to 5.
7. The use of the modified biomass charcoal of claim 6 as a catalyst for pollutant degradation reactions.
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| CN112410047A (en) * | 2020-10-27 | 2021-02-26 | 山东省科学院新材料研究所 | Iron-carrying sludge biochar and preparation method and application thereof |
| CN113941343A (en) * | 2021-11-08 | 2022-01-18 | 武汉纺织大学 | Sludge-based composite catalyst and preparation method and application thereof |
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