CN114477382B - Preparation method and application of composite adsorption-catalysis material - Google Patents
Preparation method and application of composite adsorption-catalysis material Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 46
- 239000000463 material Substances 0.000 title claims abstract description 27
- 238000006555 catalytic reaction Methods 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 25
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 20
- 239000010959 steel Substances 0.000 claims abstract description 20
- 239000000843 powder Substances 0.000 claims abstract description 18
- 239000010802 sludge Substances 0.000 claims abstract description 17
- 239000002893 slag Substances 0.000 claims abstract description 15
- 238000005245 sintering Methods 0.000 claims abstract description 9
- 238000007605 air drying Methods 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000002791 soaking Methods 0.000 claims abstract description 5
- 238000001035 drying Methods 0.000 claims abstract description 4
- 238000007873 sieving Methods 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims abstract description 3
- 238000000227 grinding Methods 0.000 claims abstract description 3
- 239000008188 pellet Substances 0.000 claims abstract description 3
- 239000002245 particle Substances 0.000 claims description 20
- 238000005273 aeration Methods 0.000 claims description 9
- 239000010865 sewage Substances 0.000 claims description 9
- 239000003344 environmental pollutant Substances 0.000 claims description 8
- 231100000719 pollutant Toxicity 0.000 claims description 8
- 239000002351 wastewater Substances 0.000 claims description 6
- 239000010842 industrial wastewater Substances 0.000 claims description 4
- 238000010304 firing Methods 0.000 claims description 3
- 230000003750 conditioning effect Effects 0.000 claims description 2
- 230000018044 dehydration Effects 0.000 claims description 2
- 238000006297 dehydration reaction Methods 0.000 claims description 2
- 229910001385 heavy metal Inorganic materials 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 239000005416 organic matter Substances 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 230000003115 biocidal effect Effects 0.000 claims 1
- 239000000356 contaminant Substances 0.000 claims 1
- 239000012798 spherical particle Substances 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract description 8
- 238000001179 sorption measurement Methods 0.000 abstract description 3
- 230000003197 catalytic effect Effects 0.000 abstract description 2
- 239000008187 granular material Substances 0.000 abstract description 2
- 238000005868 electrolysis reaction Methods 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 239000003054 catalyst Substances 0.000 description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 5
- 229910002804 graphite Inorganic materials 0.000 description 5
- 239000010439 graphite Substances 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
- 229910052719 titanium Inorganic materials 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 3
- RBTBFTRPCNLSDE-UHFFFAOYSA-N 3,7-bis(dimethylamino)phenothiazin-5-ium Chemical compound C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 RBTBFTRPCNLSDE-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 229920005372 Plexiglas® Polymers 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000004098 Tetracycline Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229960000907 methylthioninium chloride Drugs 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 229960002180 tetracycline Drugs 0.000 description 2
- 229930101283 tetracycline Natural products 0.000 description 2
- 235000019364 tetracycline Nutrition 0.000 description 2
- 150000003522 tetracyclines Chemical class 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000003242 anti bacterial agent Substances 0.000 description 1
- 229940088710 antibiotic agent Drugs 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
-
- 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
- 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
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/78—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with alkali- or alkaline earth metals
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/33—Electric or magnetic properties
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
- C02F2001/46133—Electrodes characterised by the material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/308—Dyes; Colorants; Fluorescent agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Materials Engineering (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Water Treatment By Sorption (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention discloses a preparation and application of a composite adsorption-catalysis material, which comprises the following steps: drying the crushed steel slag, red mud and sludge, grinding into powder, and sieving to obtain undersize powder A, B and C; step 2: mixing powder A, B, soaking in citric acid, standing for a period of time, adding powder C, mixing, making into pellet, and air drying to obtain spherical granule; step 3: the composite adsorption catalytic material is obtained through the processes of preheating, sintering and cooling. The invention not only is convenient to recycle and can be recycled, but also can realize the purpose of treating waste with waste by reutilizing waste steel slag, red mud and sludge.
Description
Technical Field
The invention relates to the technical field of adsorption-catalysis materials, in particular to a preparation method and application of a composite adsorption-catalysis material.
Background
At present, with the continuous development of industrial production, steel and aluminum are used as main components of building materials, the demand of the steel and the aluminum is continuously increased, but a large amount of steel slag and red mud are generated in the process of producing steel and aluminum oxide products, and the steel slag and the red mud occupy a large amount of land area because the generation of the steel slag and the red mud can not be treated in time, so that the environment is polluted. However, the steel slag and the red mud are not useless "waste", and researches show that the steel slag contains a large amount of components such as calcium oxide, iron, magnesium oxide and the like, and the red mud contains components such as silicon dioxide, iron oxide, aluminum oxide and the like. So how to select a proper treatment process to change the steel slag red mud into valuable is very necessary and urgent.
Sludge is a very complex non-uniform mass composed of organic residues, bacterial cells, inorganic particles, colloid and the like as a product after sewage treatment. The material has high water content, and the odor emitted by the material is easy to pollute the environment, thereby causing inconvenience to the life of residents. Due to the increasing amount of sludge discharged, sanitary landfills occupy a large amount of land area and have no resource utilization, new sludge treatment approaches are being sought after.
The invention mixes the steel slag, the red mud and the sludge waste according to a certain proportion, and the sintered composite catalyst can be used as an adsorbent because the steel slag and the red mud have special porous properties and have certain adsorptivity. The composite catalyst has a certain conductivity because of a large amount of metal substances such as iron and the like, and can be used as a third electrode in an electrocatalytic process. The invention combines the characteristics of adsorptivity and conductivity of the composite catalyst with the electrocatalytic process, thereby improving the effect of degrading industrial wastewater.
The industrial technology is mainly electro-Fenton technology, and the principle is that hydrogen peroxide generated by dissolved oxygen in water and Fe which is added or exists in a system by utilizing electrochemical catalysis 2+ The reaction takes place. The process of the electro-Fenton reaction can be described as:
H 2 O 2 +Fe 2+ →Fe 3+ +·OH+OH-
wherein H is 2 O 2 From dissolved oxygen in solution and electrolytically generated H + The reaction formula is:
O 2 +2H + +2e-→H 2 O 2
disclosure of Invention
In view of the above, the invention provides a preparation method and application of a composite adsorption-catalysis material.
In order to solve the technical problems, the invention adopts the following technical scheme:
the preparation method of the composite adsorption-catalysis material is characterized by comprising the following steps:
step 1: drying the crushed steel slag, red mud and sludge, grinding into powder, and sieving to obtain undersize powder A, B and C;
step 2: mixing powder A, B, soaking in citric acid, standing for a period of time, adding powder C, mixing, making into pellet, and air drying to obtain spherical granule;
step 3: the composite adsorption catalytic material is obtained through the processes of preheating, sintering and cooling.
Preferably, in the step 1, the crushed steel slag, red mud and sludge are ground into powder by using a ball mill, wherein the sludge is generally surplus sludge or canal sludge after domestic sewage treatment, and the organic matter content is more than 25% after conditioning and dehydration.
Preferably, in the step 2, air drying is performed by using a blast drying box, and the air drying time is 2 hours; the diameter of the small ball is 3mm-5mm.
Preferably, in the step 3, preheating and sintering are performed by using a tube furnace or a muffle furnace.
Preferably, the screening number is more than or equal to 200 meshes.
Preferably, the concentration of the citric acid solution is 0.02-0.04mol/L, and the solid-to-liquid ratio of the citric acid solution to the powder A, B is 4-5:1kg/L; the soaking time is 40-60min.
Preferably, said powder a: b: c=40% -60%:30% -50%:5% -15% and such that the dry heavy component in the mixed sample satisfies the following formula:
preferably, the preheating temperature in the step 3 is 300-400 ℃, the preheating time is 10-20 min, the sintering temperature is 950-1100 ℃, and the sintering time is 10-30 min.
The application of the composite adsorption-catalysis material is characterized in that the method for treating sewage by utilizing the composite catalyst can be divided into the following steps:
the method comprises the following steps: adding particles into the sewage, adsorbing for a period of time under stirring or aeration, measuring the concentration of pollutants in the sewage, taking out the particles, re-firing the particles according to the step 3 when the concentration of the pollutants is not obviously reduced or is not reduced, and recycling the calcined particles;
the second method is as follows: particles are added into the electrocatalytic device, the particles are placed between electrodes to avoid direct contact with the electrodes, pollutants are removed under aeration conditions, the electrodes generally consist of anodes (titanium, nickel, platinum, composite materials and the like) and cathodes (graphite, steel plates and the like), an adjustable direct current electrode is externally connected, the voltage is 2.5V-10V, the working time is 40-90min, the composite materials are taken out after the composite materials continuously work for a period of time, and the composite materials are re-burned for use according to the step 3.
And a third method: firstly, aerating, then adding particles into an electrocatalytic device, placing the particles between electrodes to avoid direct contact with the electrodes, wherein the electrodes generally consist of anodes (titanium, nickel, platinum, composite materials and the like) and cathodes (graphite, steel plates and the like), externally connecting an adjustable direct current electrode with the voltage of 2.5-10V and the working time of 40-90min, taking out the composite materials after continuously working for a period of time, and re-firing the composite materials for use according to the step 3; wherein the aeration period is 30-60min, and the electrocatalytic period is 20-50min.
Preferably, the wastewater is generally industrial wastewater, such as containing dyes, antibiotics, and heavy metal pollutants.
Compared with the prior art, the invention has the following technical effects:
(1) The composite catalyst disclosed by the invention changes the waste into valuable, and solves the problem of environmental pollution caused by the solid waste of steel slag, red mud and sludge while obtaining the efficient treatment of industrial wastewater, so that the purpose of treating the waste with the waste is truly realized, and the utilization of the solid waste resource is realized.
(2) The composite material has certain magnetism, larger particles and can be recovered by magnetic separation or filtration, and is suitable for various process occasions.
(3) The composite material has adsorption and electrocatalytic capabilities, can select different technological processes according to different pollutant characteristics, and is optimized in an economical and reliable technological route on the basis of ensuring the treatment effect.
(4) The composite material can be recycled, and the treatment cost is saved.
Drawings
Fig. 1 is a scanning electron microscope image of a composite adsorption-catalysis material preparation method and a composite catalyst applied by the same.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not 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 intended to be within the scope of the invention.
Example 1:
a. taking DMF (N, N-dimethylformamide) wastewater (COD about 8000) from a pharmaceutical factory, taking 50mL of the wastewater, fixing the volume in a 1L volumetric flask, taking 900mL of the wastewater, and placing the wastewater in a small electrolytic tank (length: 22cm, width: 5cm, height: 10 cm) with maximum capacity of 1200mL, wherein the electrolytic tank is made of organic glass. 1.35g of anhydrous sodium sulfate was added to the above solution;
b. titanium is selected as an anode of the electrolysis, and a graphite sheet is selected as a cathode, wherein the effective area of the electrode is 16.5cm 2 The electrode spacing is 1.25cm; 9g of prepared composite material is added between the anode and the cathode, in order to keep the particle electrode from being in direct contact with the main electrode in the electrolysis process, a screen is utilized to separate, an adjustable direct current electrode is externally connected, the external voltage is 5v, COD in the solution is measured after 80min of aeration electrolysis, and compared with the process of not adding the composite material, the efficiency is doubled.
Example 2:
a. a40 mg/L tetracycline solution was prepared and 900mL was placed in a small-sized electrolytic cell (length: 22cm, width: 5cm, height: 10 cm) having a maximum capacity of 1200mL, the electrolytic cell being made of plexiglass. To the above solution was added 0.54g of sodium chloride;
b. titanium is selected as an anode of the electrolysis, and a graphite sheet is selected as a cathode, wherein the effective area of the electrode is 16.5cm < 2 >, and the electrode spacing is 1.25cm; 1.5g of the prepared composite material is added between the anode and the cathode, in order to keep the particle electrode from being in direct contact with the main electrode during the electrolysis, an adjustable direct current electrode is externally connected by utilizing a silk screen to separate, the external voltage is 5v, the tetracycline concentration in the solution is measured after 90min of aeration electrolysis, and the removal rate is calculated to be 99%.
Example 3:
a. a50 mg/L methylene blue solution was prepared, and 900mL of the solution was placed in a small-sized electrolytic cell (length: 22cm, width: 5cm, height: 10 cm) having a maximum capacity of 1200mL, and the electrolytic cell was made of plexiglas. To the above solution was added 0.54g of sodium chloride;
b. aerating for 40min, adding a cathode and an anode, selecting platinum as the anode of the electrolysis, and graphite flakes as the cathode, wherein the effective area of the electrode is 16.5cm 2 The electrode spacing was 1.25cm. 1.5g of the prepared composite material is added between the cathode and the anode, and is placed between the electrodes, in order to keep the particle electrode from being in direct contact with the main electrode in the electrolytic process, an adjustable direct current electrode is externally connected by utilizing a silk screen to separate, the external voltage is 3.5v, the methylene blue concentration in the solution is measured after aeration electrolysis is continued for 30min, and the removal rate is 99.5% according to calculation.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent variations and modifications made to the above embodiments according to the technical principles of the present invention are within the scope of the technical solutions of the present invention.
Claims (7)
1. The preparation method of the composite adsorption-catalysis material is characterized by comprising the following steps:
step 1: drying the crushed steel slag, red mud and sludge, grinding into powder, and sieving to obtain undersize powder A, B and C;
step 2: mixing powder A, B, soaking in citric acid solution, standing for a period of time, adding powder C, mixing, making into pellets, and air drying to obtain spherical particles;
step 3: the composite adsorption-catalysis material is obtained through the processes of preheating, sintering and cooling;
the powder A: b: c=40% -60%:30% -50%:5% -15% and such that the dry heavy component in the mixed sample satisfies the following formula:the preheating temperature in the step 3 is 300-400 ℃, the preheating time is 10-20 min, the sintering temperature is 950-1100 ℃, and the sintering time is 10-30 min;
and in the step 3, preheating and sintering are carried out by using a tube furnace or a muffle furnace.
2. The method for preparing the composite adsorption-catalysis material according to claim 1, wherein in the step 1, crushed steel slag, red mud and sludge are ground into powder by using a ball mill, wherein the sludge is generally residual sludge or canal sludge after domestic sewage treatment, and the organic matter content is more than 25% after conditioning and dehydration.
3. The method for preparing a composite adsorption-catalytic material according to claim 1, wherein the step 2 is performed with air drying by using an air drying oven for 2 hours; the diameter of the small ball is 3mm-5mm.
4. The method for preparing a composite adsorption-catalytic material according to claim 1, wherein the number of the sieving meshes in the step 1 is more than or equal to 200 meshes.
5. The method for preparing a composite adsorption-catalytic material according to claim 1, wherein the concentration of the citric acid solution is 0.02-0.04mol/L, and the solid-liquid ratio of the citric acid solution to the powder A, B is 4-5:1kg/L; the soaking time is 40-60min.
6. The use of the composite adsorption-catalytic material obtained by the preparation method according to any one of claims 1 to 5, characterized in that the composite adsorption-catalytic material is used for sewage treatment, and the treatment method can be divided into the following steps:
the method comprises the following steps: adding particles of a composite adsorption-catalysis material into sewage, adsorbing for a period of time under stirring or aeration conditions, measuring the concentration of pollutants in the sewage, taking out the particles, re-firing the particles according to the step 3 when the concentration of the pollutants is not obviously reduced or is not reduced, and recycling the calcined particles;
the second method is as follows: adding particles of a composite adsorption-catalysis material into an electrocatalytic device, placing the particles of the composite adsorption-catalysis material between electrodes to avoid direct contact with the electrodes, removing pollutants under aeration conditions, wherein the electrodes generally consist of an anode and a cathode, are externally connected with an adjustable direct current electrode, have the voltage of 2.5V-10V and the working time of 40-90min, and are taken out after the composite material continuously works for a period of time and are re-burned for use according to the step 3;
and a third method: firstly, aerating, then adding composite adsorption-catalysis material particles into an electrocatalytic device, placing the composite adsorption-catalysis material particles between electrodes to avoid direct contact with the electrodes, wherein the electrodes generally consist of an anode and a cathode, and are externally connected with an adjustable direct current electrode, the voltage is 2.5V-10V, the working time is 40-90min, and the composite material is taken out after continuously working for a period of time and is re-burned for use according to the step 3; wherein the aeration period is 30-60min, and the electrocatalytic period is 20-50min.
7. The use of a composite adsorption-catalytic material according to claim 6, wherein said wastewater is generally industrial wastewater, such as dye-containing, antibiotic-containing, heavy metal-containing contaminants.
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