408 results about "Activated persulfate" patented technology

The invention relates to the technical field of environmental functional materials and water treatment, and discloses a preparation method and application of a persulfate activator for efficiently removing drug-resistant bacteria and drug-resistant genes in water. Waste biomass and waste plastics are used as raw materials, solid waste resource utilization is achieved through synergistic pyrolysis, compared with a traditional catalyst, the preparation cost can be reduced by more than 40%, and remarkable economic and environmental benefits are achieved. The catalyst has the following advantages: 1) the limitation of a traditional single-active-site catalyst is broken through through the triple synergistic effect of transition metal oxide variable valence activation, nonmetal doped carbon electron conduction and an oxygen vacancy non-free radical path; 2) physical interception of ARB and enrichment of ARGs can be realized at the same time by utilizing a multi-stage pore channel structure; and (3) activating persulfate to generate free radicals (SO4 <->. / . OH) and non-free radicals (1O2 / electron transfer) to generate a double-path synergistic effect, thereby realizing efficient removal of ARB / ARGs in water.

The invention discloses a nano-carbon supported ruthenium cluster nano-catalyst as well as a preparation method and application thereof. According to the present invention, the synthesis process of the catalyst is simple and easy to perform, the reaction process is controllable, the nanocarbon with characteristics of rich defects and large specific surface area is adopted as the carrier, the ruthenium cluster is loaded on the surface of the nanocarbon, and the nanometer catalyst with characteristics of high specific surface area and high atom utilization rate is synthesized. The catalyst can catalyze persulfate (PDS) to generate products with strong oxidation activity, namely sulfate free radicals (SO4.-), hydroxyl free radicals (. OH) and singlet oxygen (1O2), so that effective inactivation of bacteria is realized. In the invention, the reaction of activating the persulfate to disinfect by the catalyst is carried out at room temperature under neutral conditions, and in a mild reaction environment, the nanocarbon-loaded ruthenium cluster nanocatalyst shows good capability of catalyzing the persulfate to inactivate bacteria, and has huge potential in practical application of water disinfection.

The invention discloses a material for removing organic pollutants in water, a preparation method of the material and a method for treating water. The water treatment material is prepared by organically combining a precursor and an active catalytic component and optimizing and modifying the precursor and the active catalytic component, the preparation method comprises the following steps: pretreating a precursor metal organic framework, etching surface active sites by acid, doping sulfur to improve charge / spin redistribution of a carbon skeleton to regulate and control a coordination environment, and optimizing a material structure by optimizing a coordination structure and material morphology of the treated precursor through thermal derivation. The prepared material is cross-linked and doped to construct an active filter membrane; the method for treating water comprises the steps of heterogeneous activation persulfate water treatment as a catalyst, and coupling filtration and persulfate oxidation as a catalytic filter membrane for water treatment. The material for removing the organic pollutants in the water and the method for treating the water, disclosed by the invention, are excellent in performance and efficient in treatment, integrate various effects of adsorption, catalysis, membrane filtration and the like, and are suitable for water purification treatment.

The invention belongs to the technical field of solid pollutant treatment, and particularly relates to a method for removing cyanide in cyanidation tailings through metal activated persulfate oxidation. The problems that different cyanide removal mechanisms are different, the removal efficiency is low, the cost is high, secondary pollution is easily caused and the like exist in treatment of the cyanidation tailings. The tailings are subjected to cyanogen reduction treatment by adopting a stage treatment method. The method comprises the following steps: firstly, crushing the tailings to prepare a charcoal-loaded metal composite material Me / BC; when free cyanide in the tailings is smaller than or equal to 50 mg / kg, Me / BC activated persulfate is used for conducting cyanide reduction treatment on the tailings; when the tailings contain free cyanide gt; when the concentration is 50 mg / kg, free cyanides in the tailings are removed through leaching, and then Me / BC is used for activating persulfate to degrade strong complex state cyanides in the tailings. By adopting the method, the problems that complex cyanide is difficult to remove by a single leaching method and persulfate is large in dosage and high in cost in a single oxidation method can be solved, and the cascade cyanogen removal method is efficient, low in cost and free of secondary pollution.

The present invention discloses a layered metal hydroxide composite catalytic material, its preparation method and application. The composite catalytic material comprises a carrier carbon nanotube and a metal hydroxide loaded on the carbon nanotube, and the metal is iron, cobalt and nickel. Preparation method: (1) Dissolve nickel salt, cobalt salt, iron salt and urea in an alcohol solution, stir evenly, then add carbon nanotubes, and continue to stir evenly to obtain a mixed solution; (2) Carry out a solvothermal synthesis reaction on the mixed solution obtained in step (1), filter, wash and dry after the reaction is completed to obtain the layered metal hydroxide composite catalytic material. The carbon nanotubes are introduced into the layered metal hydroxide in this composite catalytic material, reducing the precipitation of metal ions, avoiding the aggregation of hydroxides, improving the stability and catalytic activity of the catalytic material, and being used for activating persulfate to degrade organic pollutants, realizing the efficient activation of persulfate so as to improve the degradation rate of pollutants.

The present invention belongs to the technical field of iron-doped biochar composite materials, and provides an iron slag biochar composite material and a preparation method and application thereof. The preparation method comprises the following steps: subjecting biomass to a first pyrolysis to obtain raw biochar; subjecting the raw biochar to acidification and mixing with iron slag and then subjecting the raw biochar to a second pyrolysis to obtain an iron slag biochar composite material; the first pyrolysis and the second pyrolysis are both carried out in a protective gas. The preparation method of the present invention is easy to operate and has a simple process. The prepared iron slag biochar composite material has the advantages of being green, efficient, and targeted, and can be used to activate persulfate to remove heavy metals and organic pollutants in water bodies, and has broad application prospects.

The invention discloses preparation of a two-component biochar composite material and application of the two-component biochar composite material to removal of antibiotics in wastewater by activating persulfate, and relates to a preparation method of the two-component biochar composite material. The invention aims to solve the problems that the existing biochar material has few surface active sites and limited catalytic ability to antibiotics in wastewater. The method comprises the following steps: 1, shearing, crushing, washing and drying a biomass material, and sieving after drying to obtain fine biomass material powder; 2, mixing and grinding the fine biomass material powder, metal salt and a pore-forming agent; and 3, placing the mixture in a tubular furnace, and carrying out pyrolysis in an inert atmosphere to obtain the bi-component biochar composite material. The bi-component biochar is synthesized through one-step pyrolysis, the preparation method is simple, operability is high, and the biochar is used for activating persulfate to remove antibiotics in wastewater.

The invention discloses a method for removing organic pollutants in a water body by activating persulfate by using an iron cluster modified manganese monatomic catalyst, which is characterized in that the iron cluster modified manganese monatomic catalyst is used as a catalyst to activate the persulfate to degrade the organic pollutants in the water body. Wherein the manganese monatomic catalyst modified by the iron cluster comprises a porous nitrogen-doped carbon layered material and manganese monatomic loaded between the surface and the layered structure of the porous nitrogen-doped carbon layered material, the manganese monatomic is modified with the iron cluster, the valence state of iron is divalent, and the valence states of manganese are divalent and trivalent. The method has the advantages of being simple in process, convenient to operate, low in cost, high in practicability, wide in application range, small in catalyst dosage, high in treatment efficiency, good in degradation effect, environmentally friendly and the like, can effectively degrade high-concentration organic pollutants in a water body, particularly has a better removal effect on organic pollutants with the concentration smaller than or equal to 30 mg / L, is high in use value and has a good application prospect. The application prospect is good.

The invention discloses a preparation method and application of a high-valence nickel monatomic catalyst, through the synergistic effect of nickel-phenanthroline complexing and inert template anchoring, dense and stable anchoring sites are provided for nickel atoms, atom migration and agglomeration in the high-temperature pyrolysis process are effectively inhibited, and the high-valence nickel monatomic catalyst is prepared. Meanwhile, by combining with an air-inert atmosphere two-step calcination procedure, air pre-oxidation is carried out, and a nickel precursor is stabilized in a carrier framework to prevent the nickel precursor from being reduced into a metal state in subsequent high-temperature inert calcination, so that the nickel precursor is locked in an electron-deficient high valence state, and a nickel-loaded material with the nickel loading capacity of 2.9-9.2 wt% and the nickel loading capacity of 9.2-9.2 wt% is prepared. And the nickel element stably exists mainly in the form of Ni < 3 + > or a higher-valence monatomic form, so that the three-in-one breakthrough of high load, high valence and high stability is realized. When the obtained catalyst activates persulfate, high-valence metal oxygen species are preferentially generated, various new pollutants are degraded, and the catalyst has high activity, selectivity and high stability.

The invention relates to a series of cobalt-nitrogen-carbon confinement cobalt nano-particle catalysts with high catalytic activity and high cycle stability and a preparation method thereof, wherein the cobalt-nitrogen-carbon confinement cobalt nano-particle catalysts are obtained by changing the ratio of cobalt-cobalt Prussian blue analogue to melamine in a precursor and calcining. Under the conditions of different ions, organic matters and complex water quality, excellent catalytic activity is still maintained, and efficient degradation of p-hydroxybenzoic acid is realized. The core-shell structure formed by the cobalt-nitrogen-carbon confinement cobalt nanoparticles in the catalyst plays a very important role in exposure of active sites and formation of local high instantaneous concentration, persulfate can be effectively activated to generate non-free radical dominated high-valence cobalt oxygen species, migration and interaction with pollutants are enhanced, and the pollution to the pollutants is reduced. And the characteristics of high activity, strong environmental resistance, high cycle stability and the like of the catalyst are realized. The catalyst has excellent removal efficiency on various pollutants, preparation and characteristics of the catalyst are not reported before, and the catalyst has a good prospect in the application field of complex matrix organic wastewater.

The invention discloses a spinel and aluminosilicate composite Fenton-like catalyst derived from iron tailings as well as a preparation method and application of the spinel and aluminosilicate composite Fenton-like catalyst. Solid waste iron tailings are used as raw materials, a powdery spinel and aluminosilicate composite material is prepared through an improved sol-gel-calcination technology, then the powdery spinel and aluminosilicate composite material, biochar and water glass are mixed, molded and calcined, and the granular composite catalyst is prepared. The method is simple and convenient to operate and low in cost, and has industrial preparation feasibility. The prepared catalyst can efficiently activate oxidizing agents such as persulfate and hydrogen peroxide to generate active oxygen species, and organic pollutants in mineralized water can be rapidly degraded. The method is characterized in that the catalyst is prepared from iron tailings in a high-valued manner, the specific surface area of the material, the generation efficiency of active species and the cycling stability are remarkably improved through structure optimization, the problems that a traditional catalyst is high in cost, poor in industrial adaptability and the like are solved, and an economical and environment-friendly new thought is provided for large-scale treatment of organic pollution through an advanced oxidation technology; the method has double benefits of tailing recycling and environmental pollution treatment.

The invention discloses a method for degrading benzene series in wastewater and inhibiting generation of bromate by electrically activating persulfate. The method is suitable for treatment of bromine-containing water. According to the method, a persulfate electrochemical activation technology is adopted, the current density and the persulfate concentration are controlled, sulfate free radicals (SO4 <.->) and hydroxyl free radicals (HO <.->) generated by an electro-activated persulfate system can effectively degrade benzene series, and meanwhile, effective inhibition on generation of bromate is realized by utilizing a cathode reduction effect; meanwhile, organic pollutants in the water body are efficiently removed. The technology does not need additional reducing agents, is green and environment-friendly, and is suitable for drinking water and industrial wastewater treatment.

The invention relates to an atomic-scale dispersed iron-based nitrogen-oxygen doped carbon material as well as a preparation method and application thereof, and belongs to the technical field of wastewater treatment. The preparation method of the atomic-scale dispersed iron-based nitrogen-oxygen doped carbon material comprises the following steps: (1) uniformly mixing a solution A and a solution B, and then centrifuging, cleaning and drying by distillation to obtain a precursor; the components of the solution A comprise dimethylimidazole and iron phthalocyanine; the component of the solution B comprises zinc nitrate hexahydrate; and (2) carbonizing the precursor at high temperature, cooling, pickling, washing with water, and drying to obtain the atomic-scale dispersed iron-based nitrogen-oxygen doped carbon material. The material prepared by the invention realizes selective adsorption of various new pollutants difficult to degrade by regulating and controlling the coordination of an iron metal atom active center, efficiently activates persulfate to degrade the new pollutants difficult to degrade in multiple ways of free radicals and non-free radicals, and widens the application range of advanced oxidation water pollution treatment.

The invention belongs to the field of water pollution treatment, and particularly relates to a method for degrading chlorophenol organic pollutants in water by activating persulfate with a cobalt-cerium dioxide monatomic catalyst in the presence of bicarbonate radicals. According to the invention, cerium nitrate hexahydrate is calcined in a muffle furnace to obtain cerium dioxide. A catalyst precursor is prepared by a traditional isovolumetric impregnation method. The prepared catalyst precursor is annealed at different temperatures to obtain a series of catalysts, the catalytic performance of Co1-CeO2-700 is optimal, and the Co1-CeO2-700 has more excellent catalytic performance in the presence of bicarbonate radicals. The preparation method provided by the invention has the advantages of simple steps, convenience in operation, quick effect of treating chlorophenol, high product yield and low cost, and has good economic value and social benefit. The prepared monatomic catalyst has the advantages of being high in atom utilization rate, good in stability, excellent in catalytic effect and the like, and is expected to become a key technology for solving actual water environment organic pollution.

The invention belongs to the technical field of environmental pollution treatment, and particularly relates to a nitrogen-doped carbon nanotube confinement composite material as well as a preparation method and application thereof. Compared with the prior art, the preparation method has the advantages that the cheap nitrogen source and transition metal salt are used as raw materials, the nitrogen-doped carbon nanotube-coated iron carbide confinement material is creatively synthesized in one step by regulating and controlling the cracking temperature, the metal nanoparticles are effectively coated in the carbon nanotubes, and the preparation method is simple to operate and high in yield. The prepared material has the advantages of large specific surface area, rich catalytic active sites, efficient electron transfer capability, strong magnetism, convenience in recovery and the like, so that the nitrogen-doped carbon nanotube confinement composite material can effectively improve the electron transfer capability of the material, reduce the binding energy between the material and persulfate, and improve the catalytic activity of the material. A reaction system mainly activates persulfate through a free radical path to generate sulfate free radicals and hydroxyl free radicals with higher oxidation-reduction potential, so that perfluoro and polyfluoroalkyl substances are effectively degraded.

The invention relates to an organic combined polluted underground water in-situ remediation method based on a micro-nano iron-based material. The method comprises the following steps: acquiring underground water pollution information; establishing a composite reaction zone at a preset position, and constructing a reduction-oxidation chain reaction system; and operating the composite reaction zone, collecting monitoring data, and optimizing the composite reaction zone until the composite pollution is degraded and removed to a preset value. Through series reaction of powerful reduction of the micro-nano iron-based material and advanced oxidation of the iron-based activated persulfate, the performance of the micro-nano iron-based material serving as a strong reduction material and an active agent is fully played, pollutants such as halogenated hydrocarbon in underground water are sequentially subjected to reduction degradation, pollutants such as benzene series and volatile phenol are sequentially subjected to oxidative degradation, and the pollution to the underground water is reduced. Effective management and control of underground water combined pollution of medical and chemical parks and enterprises are realized; a monitoring well is configured based on a composite reaction zone, and remediation materials are discontinuously added in combination with management and control conditions, or other management and control materials are flexibly selected, so that long-term management and control of groundwater pollution risks are realized.

The invention relates to a method for treating wastewater by activating peroxymonosulfate through cobalt nanoparticle encapsulated carbon nanotubes, which comprises the following steps: adding a nanoparticle encapsulated carbon nanotube catalyst with the concentration of 10-200mg / L into wastewater, and stirring; after uniformly stirring, adding peroxymonosulfate with the concentration of 0.1-2.0 mmol / L to generate hydroxyl radicals to degrade organic pollutants in the wastewater; and after the wastewater is treated, recovering the nano-particle encapsulated carbon nanotube catalyst. According to the invention, the carbon nano tube provides a protection effect on the cobalt nano particles and plays a role in continuously and efficiently activating peroxymonosulfate to generate active species, so that the carbon nano tube has excellent recycling performance; meanwhile, in practical application, the commercial PES film loaded with the cobalt nanoparticle encapsulated carbon nanotube catalyst can be used for continuously and effectively removing organic pollutants.

The invention discloses a composite membrane with adsorption separation and catalytic degradation functions as well as a preparation method and application of the composite membrane. The composite membrane is supported by a porous base membrane, a polyamide separation layer formed by reaction of a 3, 4-dihydroxyphenylethylamine and 2, 3-diaminophenol comonomer and acyl chloride is constructed on the surface of the porous base membrane through interfacial polymerization, and FeCo-g-C3N4 nanosheets are anchored in situ; the membrane can efficiently activate peroxymonosulfate (PMS) to generate free radicals under the nearly neutral condition, efficient interception and catalytic degradation of organic pollutants (such as antibiotics) are synchronously achieved, and heavy metal ions (such as Pb < 2 + > and Cd < 2 + >) are adsorbed through a functional monomer structure; the invention provides an interfacial polymerization preparation method of the membrane. The composite membrane breaks through the limitation of'only interception but not degradation 'of a traditional membrane, realizes integration of'separation-adsorption-degradation', can remarkably reduce the volume of concentrated water and reduce the toxicity of the concentrated water, and is suitable for advanced treatment of wastewater containing composite pollutants in the industries of pharmacy, printing and dyeing and the like.

The invention discloses a method for degrading bisphenol organic pollutants. The method comprises a preparation method of ferromanganese spinel with a rare earth doped particle structure and an application of the ferromanganese spinel and peroxymonosulfate in degrading the bisphenol organic pollutants by cooperating with a hydrodynamic cavitation technology. Mainly relates to combination of a Fenton-like oxidation technology and a hydrodynamic cavitation technology for activating peroxymonosulfate by using ferromanganese spinel with a rare earth doped particle structure. Comprising the following steps: activating persulfate through transfer electrons between surface defects and rare earth elements of prepared ferromanganese spinel with a rare earth doped particle structure under a hydrodynamic cavitation condition, so as to generate a large number of superoxide free radicals to degrade bisphenol organic pollutants. A rich gas-liquid interface provided by nano bubbles generated by hydrodynamic cavitation is combined, and the contact opportunity of active oxygen species and pollutant molecules is increased, so that the reaction rate and the degradation efficiency are improved. According to the method, efficient degradation of bisphenol organic pollutants is realized, and a green and efficient solution is provided for water treatment.

The present invention discloses a sulfur-nitrogen co-doped graphene hollow nanosphere and its preparation and application, belonging to the technical field of graphene nanomaterials. During the preparation, a mixture of thiourea and zinc powder is first calcined under the protection of an inert gas, and then H2O and HCl are added to the calcined product and heated for reaction, followed by post-processing to obtain the target product. The resulting product is a sulfur-nitrogen co-doped graphene material, which presents a hollow spherical morphology. This material has a large specific surface area and pore volume, and both the nitrogen and sulfur doping amounts have reached a high level. It has been verified that the obtained high-sulfur-nitrogen co-doped graphene hollow nanospheres have unique graphite nitrogen-pyridine nitrogen-thiophene sulfur synergistic active sites, which have high atomic utilization and high stability, and exhibit the best performance of activating persulfate to degrade organic matter. It can continuously and rapidly separate organic pollutants in actual water bodies and exhibit excellent stability.

The invention discloses a method for removing organic pollutants in a water body by activating persulfate with an alkali-modified copper-iron bimetallic catalyst, which is characterized in that the alkali-modified copper-iron bimetallic catalyst is used as a catalyst for activating the persulfate and degrading the organic pollutants in the water body. Wherein the alkali modified copper-iron bimetallic catalyst comprises a copper-iron metal compound (CuFeO2) and oxygen vacancies loaded on the copper-iron metal compound. The catalyst disclosed by the invention has the advantages of large specific surface area, large number of active sites, high catalytic activity, good structural stability and the like, can construct a core mechanism degradation system based on a non-free radical pathway when being used for activating persulfate, can more quickly and thoroughly remove organic pollutants in water when being used for degrading the organic pollutants in the water, and has a good application prospect. The method has the advantages of simple process, convenience in operation, low cost, high practicability, wide application range, high treatment efficiency, good degradation effect, environment friendliness and the like, and is high in use value and good in application prospect.

A method for synchronously activating persulfate using "light-heat-FeS2 / dust-free cloth" and a use. Metal iron sulfide FeS2 is loaded to the surface of black dust-free cloth ALC in an ultrasonic dispersion manner to form a FeS2 / ALC integrated photo-thermal catalyst. Persulfate is activated by using Fe2+, FeS2 / ALC absorbs solar energy to heat and activate the persulfate, and sunlight directly activates the persulfate, so that the "light-heat-FeS2 / dust-free cloth integrates three activation effects for synchronously activating the persulfate, achieving efficient degradation of organic pollutants in water.

The invention belongs to the field of soil remediation, and particularly relates to a method for remediating organic contaminated soil through cooperation of low-temperature thermal desorption and low-dose persulfate, and the method comprises the steps that S1, soil investigation is conducted, and the remediation target range is determined; s2, determining the physicochemical properties of the organic pollutants detected in S1; s3, determining process parameters; s4, a heating well, an extraction well and an injection well are arranged; s5, starting the heating well, and running an in-situ low-temperature thermal desorption process; s6, persulfate is injected, and pollutants are degraded; and S7, pollutant removal effect detection. According to the method, through design of a process mode and process parameters and continuation of operation time, volatile organic pollutants in the soil are firstly removed by ingeniously utilizing relative low-temperature interval heating, meanwhile, organic matter active ingredients of the soil are inerted, then persulfate is activated by utilizing residual heat energy, and then non-volatile organic pollutants are removed; the physical-chemical repairing technology is efficiently coupled, and the repairing cost is reduced; the method is high in operability and high in removal efficiency.

The invention discloses a preparation method and application of an electrolytic manganese residue catalyst, electrolytic manganese residues are pyrolyzed under low-temperature and anaerobic conditions, then acid pickling, water washing and drying are performed to obtain the electrolytic manganese residue catalyst, and the electrolytic manganese residue catalyst can activate persulfate so as to efficiently degrade organic pollutants and effectively remove pollutants such as antibiotics and COD in water. And the degradation rate can reach 95% or above. The preparation method has the advantages of simplicity, low preparation energy consumption, easily available raw materials, high resource utilization rate and the like, and is suitable for large-scale popularization and application.

The invention relates to a method for removing heavy metal complexes in wastewater, which comprises the following steps: S1, preparing a PMS composite agent which is prepared by ball-milling the following raw materials in percentage by weight: 50-90% of persulfate, 5-30% of sulfite and 5-20% of pypocholoride; s2, the PMS composite agent obtained in the S1 is added into industrial wastewater containing a heavy metal complex, heavy metal in the heavy metal complex is Cu and one or more of Co, Cr, Ni, Pb and Zn, complex in the heavy metal complex is one or more of EDTA, NTA, citric acid, oxalic acid, tartaric acid and sorbic acid, the mixture is stirred and dissolved, alkali liquor is added to maintain the pH of the industrial wastewater to be 9.5-11.0, and the PMS composite agent is obtained after the reaction is completed. Carrying out Fenton-like oxidation complex breaking reaction, and carrying out post-treatment after the reaction is finished, so as to obtain the reclaimed water. According to the method, the purpose of removing the heavy metal complex in the wastewater by the in-situ activation of the persulfate is achieved under the condition of not additionally adding a catalyst or applying energy sources such as electricity, ultraviolet and the like.

The invention relates to a method for treating organic wastewater through ferric salt reinforced thermal activation of persulfate, which comprises the following steps: adding ferric salt into wastewater, adjusting the pH value of the solution to be acidic, then controlling the reaction temperature to be more than 60 DEG C, and adding persulfate into the reaction solution for reaction, and after the reaction is finished, carrying out solid-liquid separation on the reaction system to realize thorough removal of organic pollutants. On the basis of removing organic pollutants through polymerization of thermal activation persulfate, ferric salt is introduced to reinforce the polymerization removal process of organic matters. Compared with the prior art, through the synergistic effect of the ferric salt and the persulfate, the utilization efficiency of an oxidizing agent and the removal rate of organic pollutants are greatly improved, meanwhile, generation of toxic intermediate products is reduced, the application range of removing the organic pollutants in water through polymerization is widened, and the problem of carbon emission caused by CO2 generation is avoided.

The invention provides an iron catalytic material as well as a preparation method and application thereof. The method comprises the following steps: carrying out in-situ etching on an iron substrate by adopting an iron salt solution with the concentration of 20-80 mM so as to form an oxygen-containing iron layer containing gamma-FeOOH on the surface of the iron substrate, thereby obtaining the gamma-FeOOH / Fe iron catalytic material, or after the gamma-FeOOH / Fe iron catalytic material is obtained, the gamma-FeOOH / Fe iron catalytic material is calcined at the temperature of 300-500 DEG C in the inert atmosphere, so that gamma-FeOOH in the gamma-FeOOH / Fe iron catalytic material is converted into alpha-Fe2O3, an oxygen-containing iron layer containing alpha-Fe2O3 is formed on the iron base material, and the alpha-Fe2O3 / Fe iron catalytic material is obtained. The gamma-FeOOH / Fe and the alpha-Fe2O3 / Fe can serve as cathode materials to be used for electrochemically activating persulfate to degrade pollutants, metal active sites are effectively fixed and protected through the oxygen-containing iron layer on the surface, leaching of iron ions on a cathode is reduced, and therefore the service life of the cathode is prolonged.

The invention provides preparation of an S / N co-doped modified biochar composite material and application of the S / N co-doped modified biochar composite material in activated persulfate resource degradation and removal of antibiotics, belongs to the technical field of wastewater treatment, and aims to efficiently degrade and remove antibiotics in wastewater and avoid environmental risks of a metal catalyst at the same time. The method is a green, environment-friendly, economical and efficient water treatment method; the preparation method comprises the following specific steps: S1, mixing and grinding waste crop biomass and metal salt to prepare modified biochar; s2, mixing and grinding the modified charcoal and a sulfur-containing compound; s3, performing high-temperature pyrolysis on the ground mixture to obtain an S / N co-doped modified charcoal composite material, and using the S / N co-doped modified charcoal composite material as a persulfate catalyst to effectively degrade and remove tetracycline in polluted wastewater; the S / N co-doped modified biochar composite material prepared by the invention effectively solves the problem of secondary utilization of waste crops, mainly improves the degradation and removal efficiency of tetracycline and realizes resource conversion of tetracycline.

The invention relates to a wastewater treatment method, in particular to a capacitive deionization-oxidation coupling high-salt industrial wastewater treatment process, which comprises the following steps: firstly, carrying out micro-filtration to remove suspended matters and adjust the pH value, then carrying out low-voltage electro-adsorption desalination through a modified capacitive deionization unit, collecting electric energy released in a regeneration stage, converting the electric energy into electric energy of a catalytic oxidation unit through a converter, and carrying out high-salt industrial wastewater treatment. Desalted water enters a non-free radical catalytic oxidation unit, a UV-LED excitation catalyst activates persulfate, singlet oxygen is generated to degrade organic matter, an intelligent control system dynamically adjusts voltage, medicament and energy distribution according to the water inlet condition, finally, capacitive deionization regeneration liquid is subjected to multi-stage membrane concentration and crystallization, salt products are recycled, and waste water treatment and recycling are achieved.

The invention discloses an algae-based iron-carbon catalyst as well as a preparation method and application thereof, and relates to the technical field of new material research and development and sewage treatment. The preparation method comprises the following steps: mixing ferrocene, diatomite and a solvent to obtain a mixed solution; adding a hydrogen peroxide solution into the mixed solution, and then heating for reaction to obtain an intermediate; and roasting the intermediate to obtain the algae-based iron-carbon catalyst. According to the invention, ferrocene and diatomite are used as raw materials, and the high-performance algae-based iron-carbon catalyst is prepared through simple solvothermal reaction and roasting treatment. The obtained algae-based iron-carbon catalyst is stable in structure, high in activity and wide in applicable pH range in a persulfate oxidation system, and can be used for activating persulfate to degrade antibiotic pollutants in water.