32results about How to "Continuous degradation" patented technology

The invention relates to a preparation method of a diatomite-loaded N-doped nanometer TiO2 photocatalysis material, which belongs to the technical fields of mineral materials and photocatalysis. The method comprises the following steps of: adding water and concentrated hydrochloric acid into diatomite mineral powder, stirring, pulping, and adding a TiCl4 aqueous solution and an NH4Cl aqueous solution, adding an ammonia aqueous solution for adjusting the pH value of a reaction liquid, and performing a hydrolytic precipitation loading and liquid phase N doping reaction on NH<4+> serving as a nitrogen source; and filtering a reaction product, washing, drying, and calcining and crystalizing in a nitrogen atmosphere to obtain the diatomite-loaded N-doped nanometer TiO2 photocatalysis material. According to the diatomite-loaded N-doped nanometer TiO2 photocatalysis material prepared with the method disclosed by the invention, the photocatalysis performance of nanometer TiO2 under visible light can be improved remarkably, a continuous degradation function on formaldehyde is realized, and the degradation rate of formaldehyde is over 86 percent within 24 hours under the condition of visible light.

The invention discloses an air purification device and method capable of continuously degrading indoor VOCs. The air purification device comprises a dehumidification unit, an inlet air inducing unit, a first purification and degradation chamber, a second purification and degradation chamber, an outlet VOCs monitor and control unit and an exhaust unit. According to the air purification device capable of continuously degrading the indoor VOCs, VOCs gas adsorption degradation and activated carbon desorption regeneration are integrated, and integrated shell mounting is easy; the air purification device has the beneficial effect of being convenient to move, an adsorbing material does not need to be replaced frequently, the consumption cost of an activated carbon adsorbing material is greatly reduced, and the service life of the activated carbon adsorbing material is prolonged; and a dehumidification pretreatment method is adopted, the efficiency that activated carbon purifies and adsorbs the VOCs later is greatly improved, the air purification effect is greatly improved, and the good market potential is achieved.

The invention discloses an iron carbon and bentonite sodium alginate gel catalyst and a preparation method and application thereof. The catalyst is made by crosslinking bentonite, active carbon, sodium alginate, deionized water and iron powder through calcium chloride, wherein bentonite and sodium alginate are taken as an embedding medium and calcium chloride is taken as a cross-linking agent. The catalyst together with persulfate is put in wastewater containing organic pollutants. The catalyst contacts persulfate to generate a large amount of sulfate free radicals with strong oxidability, so that the organic pollutants are oxidized and degraded.

The invention discloses a microwave catalyst for degrading organic wastewater and a catalytic oxidation degradation method thereof. The catalyst is of a porous structure and can be used for absorbing microwave, wherein in the adsorption of microwave, oxygen or air is introduced into the catalyst in the presence of water molecules so as to generate a large quantity of OH free radicals under microwave irradiation. By adopting the technical scheme, the microwave catalyst greatly improves the degradation efficiency, greatly shortens the processing time, is easy and feasible to operate, low in investment and operation costs, small in occupying area, complete in degradation, wide in concentration range of degrading the organic wastewater, easy for industrial production and suitable for treatment of organic wastewater in the industries of printing and dyeing, paper making, chemical industry, pharmacy and the like, and can perform continuous scale treatment; and moreover, the secondary pollution is avoided.

The invention discloses a preparation method for a ferric-carbon complex which comprises the following steps that grinding mediums with volume accounting for 70%-80% of the volume of a cavity are arranged in the cavity of a wet-grinding sand mill, wherein the grinding mediums are iron balls with the diameter of 0.15 mm or zirconia with the particle size of 0.9-1.1 mm; active carbon powder and micron order iron powder are mixed according to the mass ratio of 1:(5-10), then a lubrication solvent is added, and grinding is carried out for 1-4 hours at a grinding speed of 2000-4000 rpm; the mixed liquor after grinding is subjected to solid-liquid separation, and solid particles are cleaned with ethyl alcohol, and are vacuum dried to obtain the ferric-carbon complex. The ferric-carbon complex prepared in the invention can be used for in-situ remediation of contamination with chlorinated organics and heavy metal contained in underground water.

The invention discloses a preparation method of a magnetic oxygen deficient cobalt ferrite bimetal oxide composite catalyst. In the preparation method provided by the invention, an oxygen vacancy is introduced into CoFe2O4(CFO) with a hydrogen reduction method to prepare oxygen deficient CoFe2O4(HCFO), so that the electron transfer capacity of the catalyst is improved, and the amount of catalyticsites is increased; the catalytic activity of the catalyst is strengthened through the synergistic effect of the oxygen vacancy and transition metal; and the oxygen deficient CoFe2O4(HCFO) can effectively activate persulfate to produce a great quantity of free radicals to degrade organic matters which are difficult to degrade in water. The prepared magnetic oxygen deficient cobalt ferrite bimetaloxide composite catalyst has very strong magnetism, can realize recovery utilization of the catalyst and reduces secondary pollution.

The invention discloses a remediation device for organic contaminated soil, which is provided with a water spraying pipe, a water pumping pipe and a backfilling pipe for directly conveying an oxidizing agent and a mud-water mixture and backfilling soil correspondingly, sulfate radicals are generated through the reaction of persulfate and filler, pollutants are degraded when the contaminated soil is sprayed and impacted, and the mud-water mixture falling by impact is pumped into a processor main body, and under the combined action of a ultrasonic generation device and a ultrasonic vibration column and continuous supply of small ozone bubbles, organic pollutants are degraded in an accelerated manner, and soil particles are settled in the accelerated manner and enter the backfilling pipe. According to the device, the treatment process of solid pollution is fluidized, the polluted soil is continuously, effectively and deeply remedied, a large amount of oxidizing agents do not need to be injected into the ground, waste of the oxidizing agents and pollution to the soil and underground water are greatly reduced, the defects of traditional in-situ remediation are overcome, heavy engineering machinery for ex-situ remediation does not need to be used for excavating the soil, and the operation is simple, economical and effective.

The invention provides an integrated water treatment system for treating both water for seawater recirculating aquaculture and tail water. The integrated water treatment system comprises a sewage collection tank, a physical filtering device, an air floating pool, an electrode-suspended filler coupled biofilter treating unit, and an ozone-ultraviolet combined pathogenic microorganism killing unit which are connected in sequence, wherein the sewage collection tank, the physical filtering device, the air floating pool, the electrode-suspended filler coupled biofilter treating unit, the ozone-ultraviolet combined pathogenic microorganism killing pool are all connected with a sludge concentration-dehydration device, and the ozone-ultraviolet combined pathogenic microorganism killing pool is also connected with a culture pond. The integrated water treatment system of the invention has the characteristics of high water treatment efficiency and continuous maintenance of the high water quality of an aquaculture system, and the water circulation utilization rate of the system can reach 95% to 98%; and the integrated water treatment system can fully meet the demand for healthy culturing of cultured objects, has a tail water treatment function, and allows the tail water to be discharged after reaching the standard.

The invention discloses a preparation method for an iron-ferrous sulfide composite. The method comprises the steps that elemental sulfur powders and iron sulfide powders are mixed at a a mass ratio of 1: 5-60 or pyrite powders and micron-grade iron powders are mixed at a mass ratio of 1: 5-60; the obtained mixed raw materials are put into a ball mill tank of a ball mill; the ball mill tank is filled with grinding media, and the ball mill tank is in a vacuum environment or inert gas atmosphere; and the ball mill is started, the grinding speed is 400-4000 rpm, the grinding time is 2-30 hours, the grinding media and a product are separated after grinding, and the iron-ferrous sulfide composite is obtained. The grain size of the prepared iron-ferrous sulfide composite is below 10 micrometers. The preparation method is simple, the raw materials are low in cost, and poisonous and harmful dangerous chemicals are not used or generated. The prepared iron-ferrous sulfide composite can efficiently purify chlorine-contained organic pollutants and heavy metals in water, and is especially suitable for in-situ repairing of polluted underground water.

The invention discloses a preparation method and application of an oxygen-potential-deficiency magnetic copper ferrite catalyst. The preparation method comprises the following steps: (1) dissolving copper nitrate and iron nitrate into de-ionized water at the mol ratio of 1 to 2 and adding a certain amount of sodium citrate; (2) magnetically stirring the material obtained by the step (1) in an oil bath; (3) taking out the material obtained by the step (2) and drying to form sol; (4) calcining the sol obtained by the step (3) in a muffle furnace to obtain a first component; (5) reducing the first component in a hydrogen atmosphere to obtain the oxygen-potential-deficiency magnetic copper ferrite catalyst. The oxygen-potential-deficiency magnetic copper ferrite catalyst prepared by the preparation method can be used for effectively catalyzing persulfate and the catalyst is magnetic and can be used again after being magnetically separated.

The invention discloses a preparation method and application of a magnetic nano iron-manganese double metal oxide composite catalyst. The magnetic nano iron-manganese double metal oxide composite catalyst combines Fe3O4 and alpha-MnO2 to overcome the difficulty of recycling and reduce secondary pollution, higher catalytic activity can be achieved through the synergistic effect of the Fe3O4 and thealpha-MnO2, and PS can be effectively activated to generate a large amount of free radicals to degrade organic matters in water. The magnetic nano iron-manganese double metal oxide composite catalystprepared by the method has a saturation magnetization of 39.89 emu / g, and can be quickly separated from water by an external magnetic field.

The invention provides a high-efficiency nitrogen and phosphorus removal system for treating aquaculture tail water. The system comprises a tail water treatment biological filter, suspended filler, a direct current (DC) anodic-cathodic array combination, an electric stirring device and a carbon source replenishment device, wherein the suspended filler is arranged in the tail water treatment biological filter; the DC anodic-cathodic array combination is arranged at the upper part of the tail water treatment biological filter; the electric stirring device is arranged at the lower part of the tail water treatment biological filter; a sludge bucket is arranged at the bottom of the tail water treatment biological filter; the electric stirring device is arranged above the sludge bucket; the carbon source replenishment device is connected with the tail water treatment biological filter by means of a pipeline; the volume ratio of the suspended filler to water body in the tail water treatment biological filter is equal to 20-50%; the density of the suspended filler is 0.92-0.98g / cm<3>. The high-efficiency nitrogen and phosphorus removal system for treating the aquaculture tail water has the advantages of being high in nitrogen and phosphorus removal treatment efficiency and small in land occupancy area, does not need an air pump for oxygenation, is energy-saving, low in cost, free from secondary pollution, simple and convenient in management, and the like.

The invention discloses a porous magnesium oxychloride cement-based photocatalytic functional material and a preparation method thereof. The porous magnesium oxychloride cement-based photocatalytic functional material disclosed by the invention is prepared from 100 parts of light-burned magnesia with the activity content of 60%-65%, 60-200 parts of magnesium chloride water solution with the mass concentration of 22%-31%, 0-30 parts of admixture, 0.2-5 parts of foaming agent, 1-20 parts of photocatalyst and 0.1-1 part of phosphoric acid with the mass concentration of 85%. The porous magnesium oxychloride cement-based photocatalytic functional material disclosed by the invention can significantly improve the capability of degrading harmful pollutants in atmosphere of the porous magnesium oxychloride cement-based photocatalytic functional material by utilizing the characteristics of porous magnesium oxychloride cement and combining with a secondary load, and has the comprehensive capability in the aspects of heat preservation, heat insulation and environmental purification.

The invention provides a photocatalyst composition CNB-BiVO4. According to the photocatalyst composition CNB-BiVO4, nitrogen-containing organic matter serves as a raw material, boron-doped graphite-phase carbon nitride (abbreviated as CNB) is prepared through a hydrothermal method, a boron-containing compound and a vanadium-containing compound serve as raw materials and react in an acidic solution, then solids obtained through reaction are calcined to obtain BiVO4, and then the prepared CNB and the BiVO4 are mixed and prepared into the photocatalyst composition CNB-BiVO4 through a hydrothermal method. The prepared photocatalyst composition has a good catalytic degradation effect on organic dye and particularly azo type organic dye under ultraviolet light and can be used for treating sewage containing the organic dye.

The invention relates to a bio-contact oxidation filter sedimentation tank which mainly comprises a tank body, a filter system, a water collection system, an aeration system and other facilities, wherein the common bio-contact oxidation tank, aeration tank, sedimentation tank and filter tank in sewage treatment are organically combined. The sewage is subjected to biochemical degradation and filter sedimentation in the facilities and then enters next process or is discharged after reaching the standard; and the settled sludge flows back or is removed. Through the invention, the treatment efficiency of the sewage treatment facilities can be improved, the energy consumption is lowered, and the investment and operation cost are reduced.

The invention discloses a boron-doped ferro-manganese magnetic biochar material as well as a preparation method and application thereof. The preparation method of the boron-doped iron-manganese magnetic biochar material comprises the following steps: S1, providing biomass raw materials, namely FeCl3. 6H2O, MnCl2. 4H2O, H3BO4 and ultrapure water; s2, preparing the biomass raw material into powder; s3, dispersing the powdered biomass raw material in ultrapure water, then adding the FeCl3. 6H2O, the MnCl2. 4H2O and the H3BO4, and stirring to obtain a mixed solution; and S4, drying the mixed solution overnight, and then carrying out pyrolysis treatment to obtain a pyrolysis product. The ratio of the addition amount of the FeCl3. 6H2O to the addition amount of the MnCl2. 4H2O to the addition amount of the H3BO4 is 16.22 to 5.94 to 1. According to the preparation method disclosed by the invention, B atoms, Fe compounds and Mn compounds are doped into biomass raw materials, so that the boron-doped ferro-manganese magnetic biochar material is prepared. The prepared boron-doped iron-manganese magnetic biochar material has a good removal effect on pollutants, is high in applicability, has extremely high stability and reusability, and is an environment-friendly catalyst.

The invention discloses a preparation method and application of a ferromanganese layered bimetal hydroxide catalyst. According to the invention, the ferromanganese layered bimetal hydroxide catalyst is prepared through a co-precipitation method, wherein the electron transfer capacity of the catalyst is enhanced through the synergistic effect of ferromanganese bimetal, catalytic sites are increased, and the adsorption capacity of the catalyst is improved through exchange of interlayer anions and target pollutants. The ferromanganese layered bimetal hydroxide composite catalyst prepared by the method can effectively activate persulfate to generate a large number of free radicals and efficiently degrade refractory organic matters in water.

The invention relates to a preparation method of a diatomite-loaded N-doped nanometer TiO2 photocatalysis material, which belongs to the technical fields of mineral materials and photocatalysis. The method comprises the following steps of: adding water and concentrated hydrochloric acid into diatomite mineral powder, stirring, pulping, and adding a TiCl4 aqueous solution and an NH4Cl aqueous solution, adding an ammonia aqueous solution for adjusting the pH value of a reaction liquid, and performing a hydrolytic precipitation loading and liquid phase N doping reaction on NH<4+> serving as a nitrogen source; and filtering a reaction product, washing, drying, and calcining and crystalizing in a nitrogen atmosphere to obtain the diatomite-loaded N-doped nanometer TiO2 photocatalysis material. According to the diatomite-loaded N-doped nanometer TiO2 photocatalysis material prepared with the method disclosed by the invention, the photocatalysis performance of nanometer TiO2 under visible light can be improved remarkably, a continuous degradation function on formaldehyde is realized, and the degradation rate of formaldehyde is over 86 percent within 24 hours under the condition of visible light.

The invention discloses a preparation method for an iron-ferrous sulfide composite. The method comprises the steps that elemental sulfur powders and iron sulfide powders are mixed at a a mass ratio of 1: 5-60 or pyrite powders and micron-grade iron powders are mixed at a mass ratio of 1: 5-60; the obtained mixed raw materials are put into a ball mill tank of a ball mill; the ball mill tank is filled with grinding media, and the ball mill tank is in a vacuum environment or inert gas atmosphere; and the ball mill is started, the grinding speed is 400-4000 rpm, the grinding time is 2-30 hours, the grinding media and a product are separated after grinding, and the iron-ferrous sulfide composite is obtained. The grain size of the prepared iron-ferrous sulfide composite is below 10 micrometers. The preparation method is simple, the raw materials are low in cost, and poisonous and harmful dangerous chemicals are not used or generated. The prepared iron-ferrous sulfide composite can efficiently purify chlorine-contained organic pollutants and heavy metals in water, and is especially suitable for in-situ repairing of polluted underground water.

The invention discloses an NAS immobilized carrier microorganism generator and a technology for treating sewage by using the NAS immobilized carrier microorganism generator. The NAS immobilized carrier microorganism generator comprises a barrel-shaped shell, a cover body arranged at the upper end of the shell, and a first aeration pipe which penetrates through the cover body and is fixedly connected to the inner bottom of the shell, and a through hole penetrating through the shell is arranged; a microorganism immobilized carrier is filled between the inner wall of the shell and the outer wallof the first aeration pipe, wherein the microorganism immobilized carrier is a 1-5 cm porous ceramic material prepared by mixing and firing clay and diatomaceous earth in the mass ratio of 50: 1; microorganisms extracted from nature and transfer enzymes are combined in a carrier in a dormant manner by adsorption, covalent bonding and embedding. The technology can be used for replacing a link of culturing the microorganisms by utilizing activated sludge when the sewage is treated by an activated sludge method, high-concentration microbial flora can be continuously supplied to the sewage for a long time without addition, no activated sludge is not generated in the sewage treatment process, and the effect of zero emission of the sludge is achieved; and the technology can also be applied to microorganism treatment of polluted water bodies of lakes and rivers and other polluted water bodies.

The invention discloses a repairing device for organic polluted soil, which is provided with a water spraying pipe, a water pumping pipe and a backfilling pipe to directly transport the oxidant, the mud-water mixture and the backfilling soil respectively, and utilizes persulfate to react with fillers to generate sulfate radicals, thereby reducing pollution When the soil is sprayed and impacted, the pollutants are degraded, and the mud-water mixture that falls under the impact is pumped into the main body of the processor. Under the joint action of the ultrasonic generating device and the ultrasonic vibration column and the continuous supply of small ozone bubbles, the organic pollutants are accelerated. Degradation, the soil Particles settle at an accelerated rate into the backfill tube. The device of the present invention fluidizes the treatment process of solid pollution, carries out continuous and effective deep restoration of polluted soil, does not need to inject a large amount of oxidant into the ground, greatly reduces the waste of oxidant and the pollution of soil and groundwater, and overcomes the traditional in-situ The disadvantages of repairing are that there is no need to use major engineering machinery for ex-situ repairing to excavate the soil, and the operation is simple, economical and effective.

The invention relates to a tannin degradation technology, and discloses a method and device for continuously producing ellagic acid. The method for continuously producing the ellagic acid comprises the following steps of: after fixing tannase through a dopamine coating, contacting the tannase with substrate solution containing tannin. The device for continuously producing the ellagic acid comprises a silicone tube, an injector used for conveying a substrate containing the ellagic acid into the silicone tube, a constant flow pump used for driving the injector and a product collector used for collecting reaction products in the silicone tube; the dopamine coating fixed with tannase is formed on the surface of an inner cavity of the silicone tube; and one end of the silicone tube is connected with the injector, and the other end of the silicone tube is connected with the product collector. The method and the device provided by the invention can implement continuous and efficient production of the ellagic acid.

The invention belongs to the technical field of organic wastewater treatment, and particularly relates to an organic wastewater treatment device and system by utilizing solid adsorbent and low-temperature plasma desorption. The organic wastewater treatment device is composed of multi-tube parallel coaxial reaction chambers, a metal ground electrode electromagnetic shielding housing, an anode connecting ring, an insulation bracket and the like. The organic wastewater treatment system comprises the organic wastewater treatment device, a high-voltage nanosecond pulse power supply, an air pump, a water pump, an oxygen cylinder, a water storage tank, a gas phase detector and a water quality detector. According to the organic wastewater treatment device and the organic wastewater treatment system, in the condition that other chemical medicines are not introduced, a high-voltage nanosecond pulse technique and low-temperature plasma formed by dielectric barrier discharge are used as technical cores, the adsorption characteristics of the solid adsorbent on organic pollutants in wastewater and the electrical characteristic of easy gas discharge of an interior porous structure are utilized, electric energy is used as unique operating cost, and degradation treatment on the organic wastewater is greenly and efficiently performed. A plurality of reaction chambers are alternately used, so that the industrial actual demand of continuous treatment of the organic wastewater is achieved.

The invention relates to a preparation method of a natural porous mineral attapulgite as a carrier and loaded N-doped nano-TiO2 visible light catalyst, which belongs to the technical field of mineral material processing and photocatalysis. Add water and hydrochloric acid to the calcined and purified attapulgite ore powder, stir and make slurry, then add TiCl4 solution and (NH4)2SO4 solution; add ammonia solution to adjust pH, and use NH4+ as nitrogen source to carry out hydrolysis precipitation loading and N doping reaction; The reaction product is filtered, washed, dried and calcined to obtain a nitrogen-doped attapulgite-supported nano-TiO2 visible light catalyst. The prepared N-doped attapulgite-supported nano-TiO2 visible light catalyst reduces the band gap of TiO2 from 3.0 to 3.2eV to below 2.8eV, which can significantly improve the photocatalytic performance of nano-TiO2 under visible light; The degradation rate of formaldehyde reaches over 90% within 8 hours.

The invention discloses a CN / NCD / ZFL photocatalyst, application thereof and an antibiotic wastewater treatment method. The CN / NCD / ZFL photocatalyst is prepared through an in-situ deposition-calcination method, the charge carrier transfer capacity of the catalyst is enhanced by forming a Z-type graphite-like carbon nitride / zinc-iron layered double-metal hydroxide heterojunction, the light response range is widened, and the visible light utilization rate and the charge transfer capacity are further improved through nitrogen-doped carbon dots. The nitrogen-doped carbon dot composite graphite-like carbon nitride / zinc-iron layered double hydroxide Z-type heterojunction photocatalyst prepared by the invention can effectively respond to visible light and generate related active species, and tetracycline in water is efficiently degraded.

According to the a-SnWO4 / In2S3 composite photocatalyst, a-SnWO4 nanosheets are uniformly deposited on the surface of In2S3, so that the contact area of the a-SnWO4 nanosheets and the In2S3 is increased, and separation and migration of photo-induced electrons are enhanced. Compared with pure a-SnWO4 or In2S3, the a-SnWO4 / In2S3 composite photocatalyst has the advantages of larger specific surface area, abundant active sites and shorter charge migration distance, and shows higher photocatalytic performance, and the invention discloses a preparation process of the composite photocatalytic material. The a-SnWO4 nanosheet is loaded on the surface of In2S3, separation and migration of photon-generated carriers are facilitated, and an organic pollutant rhodamine B reagent can be continuously degraded under the condition of visible light; the preparation raw materials are common, low in cost, high in yield and suitable for actual production; the method has wide application prospects and industrialization prospects in the fields of hydrogen production through water photolysis, organic pollutant photodegradation, carbon dioxide reduction and the like.

The invention discloses a microwave catalyst for degrading organic wastewater and a catalytic oxidation degradation method thereof. The catalyst is of a porous structure and can be used for absorbing microwave, wherein in the adsorption of microwave, oxygen or air is introduced into the catalyst in the presence of water molecules so as to generate a large quantity of OH free radicals under microwave irradiation. By adopting the technical scheme, the microwave catalyst greatly improves the degradation efficiency, greatly shortens the processing time, is easy and feasible to operate, low in investment and operation costs, small in occupying area, complete in degradation, wide in concentration range of degrading the organic wastewater, easy for industrial production and suitable for treatment of organic wastewater in the industries of printing and dyeing, paper making, chemical industry, pharmacy and the like, and can perform continuous scale treatment; and moreover, the secondary pollution is avoided.

The invention discloses a preparation method and application of an iron-copper composite catalyst. The preparation method includes the following steps that 1, ferrous sulfate is dissolved in a mixed solution of ethyl alcohol and deionized water, urea is added, and the mixture is stirred to be dissolved; 2, the material obtained in the step 1 is subjected to magnetic stirring and refluxing in an oil bath, the material is centrifugally washed after being naturally cooled, precipitate is obtained, and the precipitate is dried; 3, the material obtained in the step 2 is calcined, and a first component is obtained after natural cooling is completed; 4, copper nitrate is completely dissolved in a mixed solution of ethyl alcohol and ethylene glycol; 5, the first component is added into the material obtained in the step 4, the first component is completely dispersed through ultrasonic treatment, then the mixture reacts for 3-7 h at the temperature of 115-165 DEG C, the mixture is centrifugally washed after being naturally cooled, and precipitate is obtained; 6, the precipitate obtained in the step 5 is dried under the vacuum condition, and the iron-copper composite catalyst is obtained. The adding amount of the prepared iron-copper composite catalyst and the adding amount of persulfate are both small, therefore, cost is reduced, and the catalyst can be separated and reused after being precipitated.

The invention discloses a preparation method and application of an oxygen-potential-deficiency magnetic copper ferrite catalyst. The preparation method comprises the following steps: (1) dissolving copper nitrate and iron nitrate into de-ionized water at the mol ratio of 1 to 2 and adding a certain amount of sodium citrate; (2) magnetically stirring the material obtained by the step (1) in an oil bath; (3) taking out the material obtained by the step (2) and drying to form sol; (4) calcining the sol obtained by the step (3) in a muffle furnace to obtain a first component; (5) reducing the first component in a hydrogen atmosphere to obtain the oxygen-potential-deficiency magnetic copper ferrite catalyst. The oxygen-potential-deficiency magnetic copper ferrite catalyst prepared by the preparation method can be used for effectively catalyzing persulfate and the catalyst is magnetic and can be used again after being magnetically separated.

The invention discloses a tail end purification device for urban flooding sewage draining exit overflow pollution, a sewage draining exit is arranged on a river channel revetment retaining wall, and the purification device comprises an in-situ purification module which is arranged on the outlet side of the sewage draining exit in a semi-surrounding manner, is tightly connected with the river channel revetment retaining wall and is used for rapidly degrading soluble pollutants in sewage; the filtering and purifying module is arranged on the outer side of the in-situ purifying module in a semi-surrounding manner, is tightly connected with a river channel revetment retaining wall and is used for effectively adsorbing suspended pollutants in sewage; the ecological wetland module is arranged on the outer side of the filtering and purifying module in a semi-surrounding manner, is tightly connected with a river channel revetment retaining wall and is used for further purifying the sewage; the energy dissipation module is arranged on the outer side of the ecological wetland module in a semi-surrounding mode and tightly connected with the river channel revetment retaining wall, and the elevation of the energy dissipation module is higher than the normal water level. The purification device is efficient and convenient, combined sewage can be rapidly purified after being discharged from the water outlet, and the water quality safety of a receiving water body is guaranteed.