61results about How to "High degree of mineralization" patented technology

The invention relates to the field of wastewater treatment, in particular to a catalytic particle electrode used for synchronously removing refractory organics and ammonia nitrogen from wastewater and a preparation method and application thereof. The electrode comprises shell activated carbon and metal components loaded on the shell activated carbon, wherein the particle size of the shell activated carbon is 1mm-5 mm, and the content of the metal components is 0.8wt%-2.5wt% the total mass of the activated carbon. Packing of the catalytic particle electrode has the advantages of being high in catalytic activity, low in price, easy to obtain, simple in preparation, high in COD and ammonia nitrogen degradation and removal efficiency, high in produced water mineralization degree, low in unit COD energy consumption and capable of being used continuously. Accordingly, the electrode is suitable for treatment of wastewater which is difficult to degrade biologically and contains high-concentration organic pollutants and high ammonia nitrogen.

The invention discloses a water ozonization treatment method by taking a cerium oxide nanomaterial as a catalyst. According to the method, different cerium oxide nanomaterials are prepared by adjusting and controlling the synthesis reaction conditions, and are taken as catalysts for adding into a water ozonization treatment system of phenol containing waste water, so that the degradation of phenol organic pollutants is facilitated. On the basis, a novel water ozonization treatment method is provided. The method belongs to the technical fields of water treatment and environmental catalysis. The prepared cerium oxide nanomaterial has the characteristics of small size, high dispersity in a water solution system, easiness for separation and recovery and the like, and has a wide application prospect in the application of water ozonization treatment.

The invention discloses a preparation method of a Ce-doped Fe-MOF ozone catalyst. The Ce-doped Fe-MOF ozone catalyst is formed by cerium ion-doped Fe-MOFs through hydrothermal or solvothermal self-assembling, wherein Fe-MOF is an iron-based metal organic framework material. According to the invention, Lewis acid site density of the surface of the Fe-MOF ozone catalyst is effectively adjusted by utilizing hetero-metal Ce, so the catalytic ozonation activity of the Fe-MOF is improved, the ozone adsorption and catalytic decomposition rate of a Fe-MOF catalytic material is promoted, more active oxygen species such as hydroxyl radicals are further generated, oxidative degradation of organic pollutants in water is enhanced, and the mineralization degree of the organic pollutants is remarkably improved.

The invention provides a preparation method, a product and application of a ferrous doped Fe-MOFs Fenton-like catalyst. The preparation method comprises the following steps: dissolving an organic ligand in a solvent to obtain an organic ligand solution; adding a mixed metal salt of a ferric salt and a ferrous salt into the organic ligand solution, and conducting uniform stirring to obtain a ferrous doped Fe-MOFs Fenton-like catalyst precursor mixed solution; and carrying out a solvothermal reaction on the mixed solution, and then carrying out solid-liquid separation and solid-phase drying to obtain the ferrous doped Fe-MOFs Fenton-like catalyst. The ferrous doped Fe-MOFs Fenton-like catalyst can improve Fenton-like mass transfer adsorption and catalytic decomposition rate and the efficiency of catalyzing Fenton-like oxidative degradation and mineralizing organic pollutants in water. The catalyst is applied to the field of organic wastewater pollution treatment, the catalytic Fenton-like activity of Fe-MOFs can be improved, the decomposition rate of Fenton-like reactions is promoted, and removal of organic pollutants in water is enhanced.

The invention discloses a preparation method and application of a tetracycline-polluted water body restoring material. A preparation method of nanometer cerium dioxide comprises the following steps of (1) adding cerium nitrate and surfactant into water, mixing and stirring, so as to obtain a mixed solution A; (2) adding an ammonia carbonate solution into the mixed solution A, and stirring, so as to obtain a mixed solution B; (3) filtering the mixed solution B, washing and drying the obtained precipitate, calcining, and grinding into powder, so as to obtain the nanometer cerium dioxide. The invention also discloses a preparation method of the nanometer FeO@CeO2 (ferrous oxide@cerium dioxide) by using the nanometer cerium dioxide, and a restoration method of the tetracycline-polluted water body by using the nanometer FeO@CeO2. A heterogeneous Feton technique using the FeO@CeO2 as a catalyst is proposed to prepare the FeO@CeO2 to be applied into the restoring of the tetracycline pollution in the water body, so that the reaction activity is improved, the mineralizing degree of the tetracycline is improved, and the risk of secondary pollution is reduced.

The invention discloses a millimeter level mesoporous ozone oxidation catalyst and preparation and an application method thereof, belongs to the technical field of water processing, and aims to solve the problems that the hydrodynamic performance of a conventional ozone oxidation catalyst is bad, the catalytic efficiency is low, and the stability is insufficient. The millimeter level mesoporous ozone oxidation catalyst comprises cerium, titanium, zirconium, and oxygen, is a millimeter level mesoporous spherical particle, has a unique crystal structure, at the same time, has the advantages of durable and stable catalytic activity, excellent hydrodynamic characteristics and pore structure, high compression strength, acid/alkali resistance, ligand stability, oxidation resistance, and thermal stability, and can prominently improve the mineralization degree of ozone oxidation. The valence composition of active components is not changed after repeated use. The preparation method comprises the following steps: preparing millimeter level mesoporous titanium-zirconium composite microspheres by a calcium alginate template method, and then combining cerium and the titanium-zirconium compound by an impregnation method. The provided catalyst can be applied to fixed bed reactor/fluidized bed reactor wastewater treatment, and can be thermally regenerated when pollutants are accumulated on the catalyst.

The invention discloses a method for generating free radicals through activated peroxymonosulfate to treat landfill leachate and relates to a treatment method of the landfill leachate. The treatment method comprises the steps of adding crushed and sieved secondary iron mineral and peroxymonosulfate to the landfill leachate; stirring, reacting and then precipitating; and discharging effluent and then carrying out biological treatment. According to the method, an organic matter and the peroxymonosulfate can be adsorbed on the surface of the secondary iron mineral, the peroxymonosulfate and Fe<3+> on the surface of the mineral are subjected to Fenton-like reaction to generate SO4.<-> and the organic matter adsorbed on the surface of the mineral is degraded. The method has the characteristics that the treatment efficiency is high, a toxic and harmful by-product is not generated, the cost of the secondary iron mineral and the peroxymonosulfate is low, the method is easy to operate and the influences of water body conditions on reaction are small. The method is a landfill leachate treatment method integrating heavy metal removal and organic matter degradation.

A related method for processing reverse-osmosis concentrated water through catalytic ozone oxidation: dipping peanut shell powder in a phosphoric acid solution with the concentration of 60% according to the solid-liquid ratio of 1:1-1:3, transferring the material solution to a crucible for activation, cooling, washing with a hydrochloric acid solution with the concentration of 1%, washing with deionized water to get a pH value of 7, putting in a baking oven, baking at 105 DEG C to obtain a constant weight, performing grinding or ball-milling crushing and screening; dipping peanut shell activated carbon in a transition metal ion solution with the mass concentration of 0.1-10% according to a solid-liquid ratio of 1:1-1:10, baking to dry, roasting and grinding; adding into an ozone oxidation sewage processing system containing the reverse-osmosis concentrated water, and controlling the ozone oxidation sewage processing temperature to be 5-35 DEG C; and after processing is finished, separating out the peanut-shell-active-carbon-supported metal ion catalyst for next time of the catalytic process. The catalyst employed in the method is abundant in channel, large in specific surface area and more in surface active group, and has relatively strong adsorption and catalytic effects on organic pollutants in sewage.

The invention discloses a preparation method and an application for a graphene multi-metal composite material, belonging to the technical field of graphene multi-metal composite materials. The preparation method provided by the invention comprises the following steps: adding graphene oxide into a solvent, and carrying out ultrasonic dispersion treatment for 1 to 2 h so as to obtain a graphene oxide dispersion; dissolving a reducing agent, alkali and metal salt into the graphene oxide dispersion so as to obtain a mixed solution; and subjecting the mixed solution to a high-temperature hydrothermal reaction for 12 to 24 h, carrying out cooling to a room temperature, carrying out centrifuging treatment, removing a supernatant liquid, washing a solid with deionized water, and carrying out drying so as to obtain the graphene multi-metal composite material. According to the invention, by utilization of adjustment and control of the loading concentration and the particle size of a nano-sized multi-metal compound, nano-sized catalytic sites are loaded onto the surface of graphene, so a polymetallic compound loaded by a material has the advantages of high dispersion, uniform morphology, insusceptibility to agglomeration and reinforced catalytic performance; and activation of peroxides and inhibition of generation of disinfection by-products can be simultaneously realized, and the degradation ability of a disinfectant to organic matters is greatly enhanced.

The invention discloses a red mud-based heterogeneous catalyst, a preparation method and a pollutant degradation method, belongs to the technical field of heterogeneous catalysts, and solves the problems of high cost and low degradation efficiency of a catalyst for organic pollutant degradation in the prior art. The red mud-based heterogeneous catalyst is prepared by carbonization reaction of redmud and biomass, and the mass ratio of the red mud to the biomass is 5: 1-1: 2. The preparation method includes the steps: uniformly mixing the red mud and the biomass; performing heating carbonization reaction on mixture; and sequentially cooling, cleaning and drying reaction products to obtain the red mud-based heterogeneous catalyst. The degradation method includes the steps: mixing the red mud-based heterogeneous catalyst, organic pollutant water solution and oxidizing agents; and performing stirring reaction on the mixture to degrade organic pollutants in the organic pollutant water solution. The red mud-based heterogeneous catalyst, the preparation method and the pollutant degradation method can be used for degrading the organic pollutants.

The invention discloses a flotation column which comprises a flotation column body (5) and a bubble generator (4), wherein one end of a spiral pipeline (3) is connected with a feed opening (1), an air inlet (2) is arranged beside the feed opening (1), the other end of the spiral pipeline (3) is connected with the upper part of the flotation column body (5), the bubble generator (4) is connected with the lower end of the flotation column body (5) by adopting an external inserting mode, and both the air inlet (2) and the bubble generator (4) are connected with an air pump (6). An ore slurry can be fully sheared and mineralized by the flotation column by utilizing the spiral pipeline, the generated bubbles are superfine and have better dispersion effect, and the flotation column has the characteristics of simple structure, stable operation, difficult blockage, good mineralization effect and the like, can be suitable for floating a plurality of metals or nonmetals, is a new generation of high-efficiency flotation column and can be applied to multiple fields of metal mines, coal, environmental protection and the like.

The invention discloses a method for degrading naphthalene in soil through the combination of microwave induction and catalytic oxidation. The method is characterized by comprising the following steps: mixing 5g of naphthalene-polluted soil sample, 10-50mg of catalyst and 0.6-1.0 g of distilled water, adding the above materials into a polytetrafluoroethylene reactor, and degrading the materials ina microwave digestion instrument for degradation, wherein the concentration of the soil sample is that 10mg of naphthalene is contained in every 1kg of soil, the microwave frequency is 2450MHz, the output power is 400-700W, the output pressure is 0.2 Mpa, and the microwave induction treatment time is 2-10min. A single microwave induction method and a catalytic oxidation method are combined, and the purpose of degrading polycyclic aromatic hydrocarbon in the soil through the combination of microwave induction and catalytic oxidation. The method is simple and easy to implement and has a good degradation effect on the refractory typical pollutant polycyclic aromatic hydrocarbon naphthalene in the soil.

The invention provides a cerium-titanium oxide mesoporous millimeter-sphere ozone catalyst and a preparation method and an application thereof, and belongs to the technical field of water treatment. The cerium titanium oxide catalyst is a millimeter spherical particle with mesoporous structure, has high catalytic activity, excellent hydrodynamic properties, suitable pore structure, compressive mechanical strength and stability, which can significantly improve the mineralization rate of ozonation degradation of organic pollutants. The preparation method of the cerium-titanium oxide mesoporous millimeter-sphere ozone catalyst refers to an economic preparation method suitable for cheap inorganic metal salts as raw materials, the preparation cost is greatly reduced comparing with the prior artof organometallic alkoxide process, and the preparation method of the cerium-titanium oxide mesoporous millimeter-sphere ozone catalyst is green environmental and economic. The cerium-titanium oxidemesoporous millimeter-sphere ozone catalyst can be used for catalytic ozonation treatment of wastewater in a fixed bed or a fluidized bed reactor.

The invention discloses a method for treating washing wastewater of coal chemical industry. The method comprises the following steps: firstly, carrying out partial removal on tar, suspended impuritiesand other macromolecular substances in the wastewater through a magnetic flocculation precipitation strengthening flocculation effect, then carrying out ultraviolet activated persulfate oxidation toexcite generation of sulfate radicals, effectively carrying out ring opening on refractory organic matters such as pyridine and quinoline to be decomposed into easily degradable substances such as allyl alcohol and acetamide, and thus improving the removal rate of the refractory organic matters and improving the biodegradability of the wastewater; reusing an photoelectric-Fenton oxidation method,producing a Fenton reagent by using an electrochemical method to treat the wastewater, and meanwhile, introducing ultraviolet light, wherein the ultraviolet light and Fe<2+> have a synergistic effecton the catalytic decomposition of H2O2, so that the decomposition rate is greatly improved, the refractory organic matters can be effectively treated, the degree of mineralization is high, secondary pollution cannot be generated, the operation is simple, the control parameters are only voltage and current, and the automatic control can be conveniently realized.

The invention discloses an N-doped graphene-cerium oxide composite catalyst. A preparation method of the N-doped graphene-cerium oxide composite catalyst comprises the following steps: (1) adding a CeO2 precursor, a carbon source and a nitrogen source into water, stirring evenly, and drying; (2) grinding a dried solid, roasting under the protection of nitrogen gas, cooling to obtain the N-doped graphene-cerium oxide composite catalyst. The invention further discloses the application of the N-doped graphene-cerium oxide composite catalyst to the treatment of degradation-resistant acid wastewater. The N-doped graphene-cerium oxide composite catalyst can effectively catalyze the oxidation of ozone under the acid or strong acid condition to degrade an organic pollutant.

The invention discloses a split type electro-Fenton device and a method for efficiently processing coal chemical industry wastewater through the device. The split type electro-Fenton device comprisesa preprocessing tank, an electrolytic reaction tank, a precipitation tank and a power unit. The preprocessing tank comprises a filtering tank and an oil and sulphur removal cavity. A hydrocyclone andan annular oil collecting pipe are arranged in the oil and sulphur removal cavity. The electrolytic reaction tank comprises an electrolysis cavity and a Fenton reaction cavity. An electrode plate is arranged in the electrolysis cavity. A pH detecting device and a stirring device are arranged in the Fenton reaction cavity. The power unit provides power for the hydrocyclone, the pH detecting deviceand the stirring device. The split type electro-Fenton device is simple in structure, high in organic matter mineralization degree, low in energy consumption and good in decomposition and removal effect on pyridine and heterocycle type organic pollutants.

The invention provides a spherical activated carbon ozone catalyst with high alkalinity on the surface. The spherical activated carbon ozone catalyst is prepared by the following steps: mixing asphaltof a low softening point and an oxidation accelerator with a Lewis catalyst, adding a surfactant and a water suspension, performing sphere formation, performing carbonization and activation so as toobtain a mesoporous spherical activated carbon catalyst, further adding an alkali liquid, performing sufficient mixing and modification, uniformly mixing the components through gradient temperature change, performing washing till the pH value is stable, performing vacuum drying, so as to obtain mesoporous spherical activated carbon with high alkalinity on the surface. The material is high in catalytic activity, is capable of significantly improving the efficiency of converting ozone into hydroxyl radicals and promoting mineralization of refractory pollutants, is good in stability and can maintain high catalytic activity in long-term use. The catalyst can be applied to treatment on organic pollutants, and is beneficial to adsorption and intragranular diffusion and mass transfer of pollutants, and the degradation efficiency can be improved.

The invention provides a BiOCl/graphite-like phase carbon nitride composite photocatalyst with a (010) crystal face exposed and a preparation method and application thereof. A light composite method is adopted, BiOCl is illuminated to generate electrons on the (010) crystal face, and holes are formed in the (100) and (001) crystal faces. The holes attract the layered structures g-C3N4 with negative charge through static electricity, the layered structures g-C3N4 are loaded on the (100) and (001) crystal faces with P4/nmm (129) BiOCl as tetragonal phases and space point groups, and the BiOCl (010) crystal face is exposed to form the BiOCl/g-C3N4 composite photocatalyst with the (010) crystal face exposed. The formed BiOCl/g-C3N4 composite photocatalyst with the (010) crystal face exposed has relatively high photocatalytic activity.

The invention relates to an ozone oxidation catalyst for wastewater treatment and an application method thereof, and belongs to the technical field of water treatment. The catalyst provided by the invention has efficient and stable catalytic activity, excellent fluid mechanical properties, rich pore structures, relatively high mechanical strength, proper variable valence activity, adsorption activity, catalytic ozonolysis activity and catalytic ozonolysis degradation activity, is suitable for reactors such as a bubble tower, and can be produced on a large scale. Compared with single ozone oxidation or ceramsite-based catalysts, the catalyst has the advantages that the actual wastewater organic pollutant degradation efficiency is greatly improved, the catalyst can be used for strengthening complex-state heavy metal ozone oxidation complex breaking and free heavy metal release, the efficiency of converting organophosphorus, hypophosphite, phosphite and the like into orthophosphate through ozone oxidation can be improved, the operation effect is stable, and the catalyst is suitable for advanced treatment of industrial wastewater and industrial park wastewater.