3174 results about "Catalytic oxidation" patented technology

The invention provides a zero-discharge treatment process for recycling production wastewater, and relates to the technical field of water treatment and recycling, and the zero-discharge treatment process comprises the following steps: S1, oxidizing and degrading COD through ozone and a Fenton reagent, and generating a flocculatable intermediate; s2, intercepting suspended matters by using a gradient aperture filter bed in a grading manner, and monitoring a dynamic membrane resistance coefficient delta Rm in real time to automatically trigger backwashing; s3, coupling an ultrafiltration reverse osmosis membrane to realize that the organic matter rejection rate eta is greater than or equal to 98%, and synchronously regulating and controlling flux and operation pressure by an online spectrometry; s4, regulating and controlling the current density by adopting a rotational flow electric flocculation reactor for directional crystallization to produce industrial salt with Cl <-> less than or equal to 50mg / L; and S5, based on the total dissolved solid recovery rate TR and the comprehensive energy consumption, establishing a multi-target optimization model for real-time parameter adjustment. According to the method, a membrane pollution early warning and backwashing dynamic response mechanism is constructed through cross-scale cooperative regulation and control of delta Rm and the retention rate eta, and a catalytic oxidation effect strengthening and electric crystallization parameter self-tuning technology is combined, so that the problem of cooperative optimization of high-salinity wastewater salt gradient separation and pollutant deep removal is solved.

The invention discloses a nickel-containing etching wastewater treatment process, which belongs to the technical field of environmental protection, and comprises a raw water regulating tank, a pH pre-regulating tank, a heterogeneous catalytic oxidation tower, a neutralization coagulation tank, an inclined tube sedimentation tank and a clean water tank which are connected in sequence. According to the process, under the neutral condition, a catalyst loaded with cobalt manganese oxide is used for activating sodium hydrogen persulfate, high-activity sulfate free radicals are generated, a Ni-EDTA complex structure is fractured in a targeted mode, free nickel ions are released in situ, organic ligands are synchronously mineralized, and the adding amount of sodium hydrogen persulfate is dynamically adjusted through a clean water pool closed-loop control system; and high-purity nickel hydroxide precipitate is generated through alkaline precipitation and coagulation, so that efficient solid-liquid separation is realized. The treatment process disclosed by the invention is compact in flow and stable in operation, effectively solves the problems of difficult complex breaking, low nickel removal efficiency, high sludge toxicity, difficult resource recovery and the like when the EDTA complex nickel wastewater is treated by a traditional method, realizes closed-loop recovery of nickel resources, and has the remarkable advantages of low cost, high efficiency and environmental friendliness.

The invention belongs to the technical field of catalytic oxidation of carbon-containing industrial waste gas, and particularly relates to a Pd catalyst for catalytic combustion of carbon-containing waste gas as well as a preparation method and application of the Pd catalyst. The invention provides a Pd catalyst for catalytic oxidation of carbon-containing industrial waste gas such as CO and volatile organic pollutants VOCs. The Pd catalyst is obtained by compounding an amorphous CeO2 nano-cluster with a TiO2 substrate (marked as cCeO2 / TiO2) and indirectly regulating the form of Pd through gradient regulation of the content of the amorphous CeO2 nano-cluster by a sol-gel method on the basis of strong interaction of Pd and Ce species. The Pd catalyst prepared by the invention shows excellent low ignition temperature, high performance and certain universality in the catalytic combustion process of carbon-containing industrial waste gases such as CO and low-chain VOCs (Volatile Organic Compounds). In addition, the method for preparing the Pd catalyst is simple to operate and mild in condition, and has great industrial application potential and value.

The utility model specifically discloses an odor wet oxidation treatment device, which comprises: a gas conveying unit, which is used for collecting and conveying odor gas; the wet-type catalytic ozonation unit is communicated with the gas conveying unit and is used for carrying out primary treatment on the malodorous gas so as to remove part of malodorous substances in the malodorous gas; the chemical oxidation unit is communicated with the wet-type catalytic ozonation unit and is used for further treating the malodorous gas subjected to primary treatment so as to remove residual malodorous substances in the malodorous gas; and the gas discharge unit is communicated with the chemical oxidation unit and is used for collecting the purified malodorous gas and discharging the malodorous gas outwards. According to the device, the wet ozone catalysis unit and the chemical oxidation unit are coupled, so that water-soluble and water-insoluble components in the malodorous substances can be effectively treated, and the device is small in occupied area and does not generate hazardous wastes. Therefore, the device has the characteristics of low cost and small pollution, and can better adapt to subsequent treatment of malodorous gas in industrial enterprises.

The invention belongs to the technical field of biological dyes, and discloses a bio-based melanin precursor compound, bio-based melanin as well as a preparation method and application of the bio-based melanin precursor compound and the bio-based melanin. The invention provides a bio-based melanin precursor compound 4-[5-(2, 2-diaminoethyl)-2, 3-dihydroxyphenyl]-1H-indole-5, 6-diphenol, and a preparation method of the bio-based melanin precursor compound. The bio-based melanin precursor compound is stable in chemical property and easy to store. And the catalyst can be used as a raw material to efficiently synthesize bio-based melanin through a catalytic oxidation reaction. The process for preparing the bio-based melanin is simple, mild, high in yield and suitable for large-scale industrial production. The bio-based melanin prepared by the invention has good application performance during dyeing, does not generate harmful substances, and is safe and environment-friendly.

The invention relates to the technical field of organic fertilizer preparation and waste recycling, in particular to a food industrial park wastewater recycling and sludge resourceful treatment method which comprises the following steps: step 1, dynamically partitioning wastewater and cooperatively separating grease, monitoring the conductivity and turbidity of wastewater at water outlets of all workshops in real time, and dynamically dividing wastewater load grades according to monitored values; step 2, coupling biological treatment and carbon source circulation, inputting the effluent in the step 1 into an anaerobic reactor according to a real-time COD load ratio, adding a sludge glycolysis solution as a carbon source supplement, and dynamically adjusting the adding amount based on the ratio of volatile fatty acid to alkalinity; step 3, catalytic oxidation-membrane coupling advanced treatment: carrying out catalytic ozonation on aerobic effluent through sludge-based activated carbon, and adjusting the filling amount of a catalyst in a stepped manner along with characteristic parameters of organic matters in the effluent; 4, directional glycolysis of the sludge and closed-loop utilization of products. Through monitoring and dynamic adjustment, the problems of high energy consumption, low treatment efficiency, resource waste and the like in a traditional wastewater treatment method are effectively solved.

The invention relates to the technical field of industrial production wastewater treatment, and particularly provides a resource utilization method of calcium chloride high-salt water containing high-concentration organic matters. The method comprises the steps of pretreatment, wet catalytic oxidation, salt type conversion, softening filtration, deep oxidation, nanofiltration purification and targeted adsorption, no residual mother liquor exists, no secondary pollution is generated, organic matters in effluent are stable and reach the standard, the water quality and water quantity fluctuation resistance is high, heterogeneous and homogeneous catalysts are combined for catalysis, and the purification effect is good. According to the method, the sodium chloride solution is used as a raw material, the homogeneous catalyst is recycled, in addition, most of salt in the homogeneous catalyst is also recycled, resource reutilization is fully achieved, the treatment cost is reduced, and the treated sodium chloride solution can be used as primary saline water for subsequent ion membrane electrolysis.

The invention relates to the technical field of industrial wastewater treatment, and discloses an efficient two-stage reverse osmosis petroleum coke water treatment system, which comprises pretreatment execution ends, a reverse osmosis core end, a concentration regeneration end and an intelligent control end which are commonly configured with a data feedback module. A step-by-step mechanism is established at the initial stage of wastewater treatment, quartz sand is adopted to intercept large-particle suspended solids, activated carbon is adopted to adsorb and degrade organic matters, softening resin is adopted to replace and remove scaling ions, ozone is adopted to catalyze, oxidize and decompose refractory pollutants, an oxidation-reduction potential dynamic regulation and control mechanism is innovatively introduced, and the dosage of an oxidizing agent is automatically regulated according to water quality and chemical quality; by means of the design, the blocking problem caused by high-hardness waste water is solved, the membrane is prolonged, the solution period is stably solved, the chemical cleaning frequency and agent consumption are reduced, a pollution early warning and closed response linkage mechanism is constructed, membrane damage caused by manual intervention delay is avoided, and the service life of membrane elements is prolonged and reduced.

The invention discloses a sewage treatment system and method based on combination of ultrasonic micro-electrolysis and catalytic oxidation, and relates to the technical field of environmental protection, and the method comprises the following steps: sewage is pretreated by generating active free radicals through ultrasonic enhanced micro-electrolysis, and then enters a catalytic oxidation unit to be deeply mineralized together with ozone; the ultrasonic power, the ozone adding amount and the reflux ratio are dynamically adjusted through the fluid circulation and intelligent control unit; and the tail water is fed back through online monitoring to reach the standard. The system integrates an ultrasonic micro-electrolysis module, a catalytic oxidation module, an intelligent control module and an automatic backwashing module, and realizes closed-loop optimized operation. The method solves the problems of low treatment efficiency of refractory organic matters, strong drug dependence, easy damage of equipment, poor adaptability and the like in the prior art, obviously improves the COD removal rate to 95% or above, reduces the energy consumption by 20%, does not need additional drugs, is suitable for high-difficulty wastewater treatment of printing and dyeing, pharmacy and the like, and has the advantages of high efficiency, stability, low consumption and engineering.

The invention provides a cyanide breaking agent and method for treating alkaline cyanide-containing wastewater. The cyanide breaking agent is a combination of an oxidizing agent, a Fe3O4 ZIF-8 core-shell magnetic catalyst and PDMS-hydrophobic silicon dioxide composite liquid. Through a catalytic oxidation-adsorption integrated method, the reaction path is shortened, efficient removal of cyanide is realized, the effluent is far lower than 0.5 mg / L specified by the national standard, a recyclable product is obtained, and the risk of secondary pollution caused by HCN or heavy metal precipitation is reduced; non-photocatalytic nanoscale Fe3O4-ZIF-8 core-shell magnetic catalyst particles are combined with PDMS-hydrophobic silicon dioxide composite liquid to cooperate with an oxidizing agent, the process that cyanide is converted into non-toxic products through integrated two-stage oxidation is promoted, and meanwhile the content of ammonia nitrogen in wastewater is further reduced by combining modified activated carbon.

The utility model discloses a plug-flow type electrocatalytic oxidation industrial wastewater treatment device which comprises a box body, a water inlet is formed in one end of the box body, a water outlet is formed in the other end of the box body, an oxidizing agent is filled in the box body, a plurality of cathode plates are arranged at the top and the bottom in the box body, a mounting plate is horizontally arranged in the box body, and an anode plate is hinged to the mounting plate. The anode plates are located between the adjacent cathode plates, and turning guide plates are hinged between the anode plates and the cathode plates on the same side; a driving assembly and a moving assembly are arranged outside the box, one end of the mounting plate penetrates out of the box and then is connected with the moving assembly, and the driving assembly is suitable for driving the moving assembly to drive the mounting plate to horizontally move. When the anode plate moves, the direction-changing guide plate is driven to move so as to disturb wastewater, so that the wastewater is in a flowing state all the time and sequentially flows through the polar plates, the contact with the cathode plate and the anode plate is increased, the electro-catalysis effect is improved, the wastewater is quickly and uniformly mixed with an oxidizing agent, and the oxidation effect is greatly enhanced.

The invention relates to a spherical hydrotalcite phase desulfurization adsorbent as well as a preparation method and application thereof, the preparation method comprises the following steps: mixing an iron source, a nickel source and organic carboxylate, and then carrying out hydrothermal carbonization reaction to obtain the spherical hydrotalcite phase desulfurization adsorbent. The nickel source and the iron source are selected as the raw materials, hydroxide radicals of laminates and carbonate ions between the laminates of the prepared hydrotalcite phase desulfurization adsorbent can increase the alkalinity of the surface of the desulfurization adsorbent and improve the adsorption capacity to hydrogen sulfide, and meanwhile, the hydrotalcite phase desulfurization adsorbent can react with hydrogen sulfide in a catalytic oxidation manner, so that the removal efficiency is improved. Organic carboxylate is selected as a hydrothermal auxiliary agent, carboxylate radicals can chelate metal ions through multidentate coordination to form a stable complex, so that the nucleation rate of hydrotalcite is delayed, the particle size uniformity is improved, meanwhile, a carbon coating layer is generated through hydrothermal carbonization, and pores in the carbon coating layer and pores in hydrotalcite can form hierarchical pore channels, so that the composite material is prepared. The mass transfer efficiency is synergistically improved, so that the adsorption capacity of the adsorbent is improved.

The invention discloses stable silicon dioxide microspheres as well as a preparation method and application thereof. Mixing a sodium silicate diluent and an organic acid aqueous solution to form colloidal particles, and carrying out a sol-gel reaction to obtain silica sol; the preparation method comprises the following steps: in an air environment, throwing silica sol into water under stirring to form microspheres, injecting inorganic acid into the water at the same time, then injecting a sodium silicate diluent for reaction, and then adjusting the pH value of the system to 6-7; and aging, washing, drying and roasting to obtain the silicon dioxide microspheres. The preparation method comprises the following steps: mixing a sodium silicate diluent and an organic acid aqueous solution by an acid mixing method, granulating by air to form microspheres, and finally injecting inorganic acid to quickly remove heat, reduce pressure drop and maintain the state of the microspheres, thereby obtaining the stable silicon dioxide microspheres. The porous silicon dioxide microsphere with larger surface area and pore volume is obtained, has better catalytic performance when being used as a catalytic oxidation carrier, and has the advantages of high conversion rate and high stability.

The invention discloses a high-entropy metal oxide catalyst as well as a preparation method and application thereof in CO catalytic oxidation, and belongs to the technical field of flue gas treatment. The preparation method comprises the following steps: dissolving copper salt, manganese salt, cerium salt, cobalt salt, vanadium salt and a dispersing agent into water to form a uniform solution, and slowly adding excessive alkali precipitant into the uniform solution to form a solid-liquid mixture; the solid-liquid mixture is transferred into a high-pressure kettle to be subjected to a hydrothermal reaction and then quenched, an obtained hydrothermal reaction product is calcined, and the high-entropy metal oxide catalyst is obtained and is high in catalytic oxidation activity on carbon monoxide at the low temperature, excellent in water resistance and sulfur resistance and particularly suitable for treatment of complex flue gas.

The invention discloses a green treatment system and process based on steel structural part coating waste gas, and relates to the technical field of steel structural part coating. The system comprises a multi-stage pretreatment module, a composite adsorption regeneration system, a catalytic oxidation and waste heat recycling module and a data monitoring and operation and maintenance platform. The process comprises the following steps: step 1, multi-stage pretreatment; step 2, gradient adsorption; step 3, microwave regeneration and negative pressure enhanced regeneration, and step 4, intelligent regulation and big data optimization, by adopting a double-layer adsorption structure of zeolite molecular sieve (outer layer) and mesoporous activated carbon (inner layer), differential capture is performed on low-boiling-point and high-boiling-point VOCs: the outer-layer zeolite molecular sieve quickly adsorbs low-boiling-point components, the inner-layer mesoporous activated carbon enriches high-boiling-point components, and the low-boiling-point components and the high-boiling-point components are separated from each other; and meanwhile, the microwave negative pressure regeneration technology is combined, so that high-boiling-point organic matter residues are avoided.

The invention relates to the field of biomass energy and chemical industry, in particular to an efficient methanol preparation method based on biomass graded catalytic conversion and cycle coupling. The method comprises the following steps: in a graded catalytic oxidation reaction system, mixing a biomass raw material with a composite vanadium-based catalyst, water, oxygen and circulating methanol for reaction to generate a gas-liquid mixture containing methyl formate; recycling methyl formate by using a gradient variable-pressure rectification separation system; carrying out an interface hydrogenation reaction under the action of a copper-zinc-LTA hierarchical pore catalyst to generate methanol; finally, part of methanol is purified and recycled through membrane separation. The method realizes efficient conversion from biomass to methanol, has the advantages of mild reaction conditions, low energy consumption, high yield and good catalyst stability, and opens up a new path for industrialization of preparation of methanol from biomass.

The invention discloses a cobalt-copper bimetallic nitrogen-doped carbon catalyst, which is characterized in that CoCu-coated LNC, Co and Cu nanoparticles are anchored on a nitrogen-doped carbon carrier derived from lignin. Accordingly, the inventor also establishes a corresponding preparation method, and the catalyst is prepared by taking lignin as a carrier, cobalt-copper bimetal as an active component and dicyandiamide as a nitrogen source through one-pot pyrolysis. The method has the characteristics of simple and efficient process, high catalyst stability and activity, economy, high efficiency, environmental friendliness and the like. The method is used for preparing 2, 5-furandicarboxylic acid through thermal catalytic oxidation of 5-hydroxymethylfurfural, the yield of the target product FDCA almost reaches 100%, and the application prospect is wide.

The invention discloses an electrocatalytic oxidation method for highly selectively converting 5-hydroxymethylfurfural into 2, 5-furandicarboxylic acid by using a cobalt-nickel bimetallic catalyst, and belongs to the technical field of electrochemistry. Firstly, foamed nickel is pretreated; secondly, preparing a cobalt-nickel mixed solution, synthesizing the catalyst by adopting a solvothermal method, and characterizing the catalyst; and thirdly, preparing a three-electrode system by taking the cobalt-nickel catalyst as a working electrode, a spiral platinum wire electrode as a counter electrode, a Hg / HgO electrode as a reference electrode, an alkaline solution as an electrolyte and a Nafion 117 proton membrane as a diaphragm to realize conversion. And finally, testing the stability and cyclicity of the cobalt-nickel catalyst. Under the same potential, the material has the highest current density, the maximum electrochemical active area and the optimal charge transfer rate; the self-degradation of HMF can be effectively inhibited, the electrocatalytic oxidation has lower initial potential than the oxygen evolution reaction, and the electrode cycle stability is good; the method is simple in process, mild in condition and beneficial to industrial production.

The invention belongs to the technical field of water purification materials, and particularly relates to a multifunctional water purification gel material and a preparation method thereof. The composite material consists of an outer-layer film, a middle-layer framework and an inner-layer carbon core, the outer-layer film is prepared from the following raw materials: sodium alginate, carboxymethyl starch, NaCl and Tween-20; the middle-layer framework is prepared from the following raw materials: chitosan, modified sodium bentonite and Fe-P nano powder; the inner-layer carbon core is prepared from the following raw materials: rice hull biochar, nano CaCO3, FeCl3. 6H2O and FeSO4. 7H2O. Efficient water purification is achieved through a three-layer synergistic structure, and the outer layer Ca < 2 + > cross-linked sodium alginate / carboxymethyl starch porous membrane intercepts particles and buffers metal ions; the middle layer is integrated with chitosan to chelate heavy metals, CTAB-bentonite electrostatically adsorbs anions and Fe-P nanoparticles to precipitate phosphate / arsenate; and the biochar-Fe3O4 complex on the inner layer provides deep adsorption and catalytic oxidation functions.

The present invention discloses a CrN-supported Pt single-atom site catalyst, its preparation and application. In the present invention, a novel Pt single-atom site catalyst is prepared with CrN as the support and single-atom Pt as the active component. Among them, CrN has excellent electrical conductivity, good acid resistance and structural stability, and is an ideal support for the Pt single-atom catalyst used in the electrocatalytic oxidation reaction of hydrogen. Moreover, due to the strong interaction between Pt atoms and the large specific surface area of the prepared CrN, the atomic-level uniform distribution of Pt and the improvement of the loading amount are ensured, so that the catalyst not only has high catalytic performance but also has the ability to resist CO poisoning. The problem of particle agglomeration during the formation of CrN is effectively alleviated by the method of silica coating. This method has universality and can be used to prepare various nanomaterials of small-sized transition metal nitrides, providing conditions for improving the performance of the catalyst after loading single-atom Pt.

The invention discloses a mechanical grinding catalytic oxidation stirring device, a manufacturing method thereof and application of the mechanical grinding catalytic oxidation stirring device in wastewater treatment and belongs to the technical field of wastewater treatment. The mechanical grinding catalytic oxidation stirring device comprises a driving friction catalytic medicine permeating paddle, a driven friction stirring paddle and a support barrel, a friction groove in the inner wall of the driven friction stirring paddle is in friction fit with a first friction catalyst on the outer wall of the driving friction catalytic medicine permeating paddle, and the friction groove is in friction fit with a second friction catalyst on the outer wall of the driving friction catalytic medicine permeating paddle by adjusting rotation resistance and a friction gap. The rotation differential speed is adjusted, a catalyst is directly loaded on a mechanical grinding catalytic oxidation stirring device, and high-efficiency degradation of refractory organic pollutants can be realized by combining technologies such as mechanical grinding, friction catalysis and stirring with advanced oxidation.

The invention belongs to the field of wastewater treatment, and particularly relates to a method for co-treating high-salt degradation-resistant organic wastewater based on electro-polymerization of in-situ activated chlorine free radicals of a penetrating electrode. The method comprises the following steps: by taking a penetrating electrode as an anode, sequentially and alternately arranging the anode and the cathode to form an electrode group, placing the electrode group in a reaction tank, connecting the cathode and the anode of the electrode group with a direct-current power supply, and carrying out electrocatalytic degradation on the high-salt degradation-resistant organic wastewater to be treated in the reaction tank; the transmission type electrode comprises a porous conductive substrate and a metal oxide catalytic layer loaded on the surface of the porous conductive substrate. Under the action of low current, the metal oxide catalytic layer of the anode activates chloride ions in the wastewater in situ to generate chlorine free radicals, and refractory pollutants are degraded through the action of electrocatalytic oxidation; meanwhile, a low-current polymerization reaction is initiated to generate a polymer to adsorb pollutants, so that electrocatalytic oxidation and polymerization synchronous synergistic decontamination is realized.

The present invention belongs to the technical field of methane resource utilization and plasma chemical synthesis, and relates to a method for plasma-catalytic oxidation of methane to methanol. Specifically as follows: In a dielectric barrier plasma reactor, methane and oxygen are used as raw material gases. Methane and oxygen are activated through a DBD reactor, and methanol is synthesized in one step under the action of a non-metal supported catalyst. The method of the present invention has high methanol selectivity, and the catalyst used does not generate carbon dioxide. The supported boron-based catalyst adopted in the present invention enables the reaction to occur at low temperature and normal pressure, with mild conditions and simple operation; the process belongs to a one-step method, with a simple process flow, a green method, and solves the problem that the conventional catalytic oxidation of methane to methanol requires high temperature and high pressure. It is applicable to the oxidation synthesis of organic compounds from various lower hydrocarbons, and products such as formaldehyde, formic acid, ethanol, and acetic acid can be obtained in addition to methanol.

The invention belongs to the field of high-salinity organic wastewater treatment, and particularly relates to a shale gas high-salinity wastewater electrochemical catalysis coupling membrane separation low-carbon treatment method which comprises the steps of pretreatment, electrocatalytic oxidation, membrane separation, salt recycling and product recovery, intelligent management and control, energy coupling and the like. Through cooperation of an electrochemical catalysis coupling membrane separation technology and mass transfer strengthening, anti-pollution design and intelligent optimization of an intelligent energy system, the treatment efficiency and the recycling level of the shale gas high-salinity wastewater can be remarkably improved, and low-carbon, economical and efficient treatment of the shale gas high-salinity wastewater is achieved; and the method can also be used for treating similar high-salt organic wastewater generated by conventional oil and gas resource development, and has good popularization and application prospects.

The invention discloses an organic waste gas treatment device and treatment method, and belongs to the technical field of waste gas treatment. Aiming at the problems of low treatment efficiency, high operation cost, secondary pollution and the like in the existing organic waste gas treatment technology, the device disclosed by the invention is formed by sequentially connecting a pretreatment unit, an adsorption concentration unit, a catalytic oxidation unit and a tail gas treatment unit, the adsorption concentration unit adsorbs organic matters by using activated carbon, after saturation, high-concentration waste gas is formed through hot air desorption, the catalytic oxidation unit converts the organic matters into carbon dioxide and water under the action of heating and a noble metal catalyst, and the tail gas treatment unit ensures that tail gas reaches the standard to be discharged through alkali liquor spraying and demisting. The processing method is matched with the device, and specific processing parameters are set in each step. Cooperative treatment of all the units is achieved, the organic matter removal rate is high, catalytic oxidation energy consumption is low, secondary pollution is reduced, the environmental protection performance is excellent, and good application prospects are achieved.

The invention belongs to the technical field of nano-enzymes, and particularly relates to a CuPH (at) KMO composite nano-enzyme material as well as a preparation method and application thereof. Aiming at the problems of poor catalytic activity, complex steps, high raw material cost and low biocompatibility of nano-enzyme prepared by the existing method, the preparation method comprises the following steps: by taking terephthalic acid and histidine as dual-coordination copper-based nano-enzyme as a precursor, introducing manganese oxide in situ under a hydrothermal condition; and the flower-like nano mimic enzyme which is uniform in size and has high laccase-like catalytic characteristics at the same time is synthesized. The composite nano-enzyme provided by the invention can catalytically oxidize phenol amine organic compounds under the condition that the pH value is 3-9, can realize the detection of the content of ergothioneine in cosmetics and nutritional supplement capsules, and can be applied to the field of cosmetic and food safety monitoring.

The invention belongs to the technical field of photocatalytic oxidation of gaseous alkanes, and particularly relates to a method and system for photocatalytic oxidation of gaseous alkanes, and the method comprises the following steps: under illumination, enabling a photocatalyst, bubbles containing gaseous alkanes and chlorine-containing active substances to react at an interface of a two-phase system containing an organic phase and a water phase to generate an oxidation product, the oxidation product comprises one or more of acid, alcohol and aldehyde, and the organic phase can dissolve the chlorine-containing active substance. The method provided by the invention is beneficial to improving the generation rate of oxidation products and the apparent light quantum efficiency of photocatalytic reaction.

The invention discloses a plasma hydrodynamic cavitation aeration coupled piezoelectric catalysis organic wastewater treatment system and method. The system comprises a wastewater tank, a water pump, a Venturi tube hydrodynamic cavitator, a catalytic oxidation reactor, a piezoelectric particle separator, a piezoelectric catalytic particle bin, a low-temperature plasma generator and an air pump. By coupling piezoelectric catalysis, pressure pulsation mechanical energy generated by hydrodynamic cavitation is converted into chemical energy for driving the piezoelectric effect, on one hand, pollutants are directly oxidized, and on the other hand, plasma by-product H2O2 is efficiently converted into. OH with strong oxidizing property, so that cooperation with plasma advanced oxidation is formed, and the pollutant removal efficiency is improved. The pollutant degradation energy efficiency and the energy utilization rate of the system are greatly improved. Meanwhile, the system realizes efficient recovery and cyclic utilization of the magnetic piezoelectric catalytic particles through the magnetic separation type piezoelectric particle separator, so that secondary pollution of the catalyst is fundamentally avoided.

The invention discloses an electrocatalytic oxidation flexible polishing method for smoothing the surface of a composite material, and belongs to the field of ultra-precision machining. The composite material workpiece is connected to the positive electrode of a power source, and a polishing solution supply pipe mixed with catalytic abrasive particles and an oxidizing agent is connected to the negative electrode of the power source; voltage is applied to the composite material workpiece, a polishing solution is sprayed to the surface of the composite material workpiece through a polishing solution supply pipe to form a closed loop, and then the surfaces of different phases of the composite material workpiece are modified into oxides with smaller performance difference through the electrocatalytic oxidation process; and removing oxides on the surface of the composite material workpiece by adopting a flexible polishing tool. According to the method, the surfaces of different phases of the composite material workpiece are modified into oxides with smaller performance difference through electrocatalytic oxidation, the initial performance difference between the different phases is weakened, inter-phase height difference effective smoothing and confinement electrocatalytic oxidation flexible polishing are achieved, the surface quality is improved, and the problems of surface scratches, subsurface damage and the like are solved.

The invention belongs to the technical field of formaldehyde waste gas treatment for plywood gluing, and relates to a circulating formaldehyde adsorption regeneration system for plywood gluing. The electrostatic-ultrasonic coupling demister and a humidity self-adaptive purification adsorption path are introduced, so that the problem that the efficiency of a traditional adsorption process is reduced under the conditions of paint mist particle interference and humidity fluctuation is solved, and the adaptability to complex working conditions is improved; an adsorbent performance attenuation kinetic model and a multi-source data intelligent control strategy are established, accurate monitoring of adsorption saturation and dynamic adjustment of an adsorption penetration threshold value and regeneration process parameters are achieved, and the problem that the treatment effect is reduced due to adsorbent performance attenuation is solved; through the design of the grading regeneration technology and the tail gas catalytic oxidation device, the energy utilization efficiency in the adsorbent regeneration process is optimized, high-concentration formaldehyde mixed gas is thoroughly decomposed into harmless substances, and the risk of secondary pollution is avoided.