31results about How to "Improved pore size distribution" patented technology

The invention discloses a gasoline engine particle trap with low back pressure amplification and narrow pore size distribution and a preparation method thereof, and belongs to the technical field of gasoline engine tail gas emission treatment. The preparation method comprises the following steps: mixing an inorganic raw material, a pore-forming agent, a binder and water to prepare a pug, carrying out pugging, extrusion molding, microwave drying and high-temperature sintering to prepare a ceramic matrix, and carrying out pore plugging and catalyst coating on the ceramic matrix to prepare the gasoline engine particle trap. Wherein the median particle size D50 of a mixture formed by mixing the inorganic raw materials, the pore forming agent and the binder is controlled to be within the range of 20-26 microns, the span (D90-D10) / D50 is smaller than 1.4, and the gasoline engine particle trap with the back pressure amplification being 13-56% is obtained. According to the method, the pore size distribution condition of the ceramic matrix can be pre-judged in actual production, so that particle distribution adjustment of raw materials is carried out, and the pore size consistency of gasoline engine particle traps produced in batches is guaranteed.

The invention relates to the technical field of organic synthesis, and provides a method for efficiently preparing 1, 3-cyclohexanedione through selective hydrogenation, which comprises the following steps: preparing hexagonal mesoporous silicon oxide by taking tetraethoxysilane as a silicon source and dodecylamine as a structure-directing agent, compounding the hexagonal mesoporous silicon oxide with titanium oxide to obtain a carrier, and taking palladium as a catalytic active component to prepare a catalyst I; preparing a copper-based coordination polymer by taking copper chloride dihydrate and phenylacetylene as raw materials; preparing a catalyst II by taking nickel as a catalytic active component; the method comprises the following steps: reacting resorcinol with hydrogen under the combined action of alkali, water, a catalyst I and a catalyst II, and then acidizing and recrystallizing to obtain the target product 1, 3-cyclohexanedione. According to the method, resorcinol is taken as a raw material, the self-made catalyst I and the self-made catalyst II are adopted for concerted catalytic hydrogenation, 1, 3-cyclohexanone with relatively high purity is prepared, and the catalysts are high in catalytic activity, easy to separate and still have very good catalytic performance after being recycled for multiple times.

The invention discloses concrete with high salt corrosion resistance and a preparation method of the concrete. The concrete is prepared from 300-400 kg / m < 3 > of cement, 50-150 kg / m < 3 > of slag powder, 1000-1200 kg / m < 3 > of gravel, 650-800 kg / m < 3 > of machine-made sand, 0.5-2 kg / m < 3 > of a modified polycarboxylic acid water reducing agent, 0.005-0.01 kg / m < 3 > of an air entraining agent, 0.05-0.1 kg / m < 3 > of an ion chelating agent, 0.05-0.1 kg / m < 3 > of polyacrylamide, 0.01-0.05 kg / m < 3 > of sodium methyl silicate, 0.1-0.5 kg / m < 3 > of multiwalled carbon nanotube dispersion liquid and 140-160 kg / m < 3 > of water. The preparation method comprises the following steps: stirring and mixing the modified polycarboxylate superplasticizer, the air entraining agent, the ion chelating agent, the polyacrylamide, the sodium methyl silicate and part of the water for mixing to obtain an admixture mixed solution; sequentially putting broken stones, cement, machine-made sand, the admixture mixed solution, the multi-walled carbon nanotube dispersion liquid and the rest of mixing water into a stirrer, and stirring for 2-3 minutes, so as to obtain the concrete with high salt corrosion resistance. The concrete has high salt corrosion resistance in a complex service environment, the service life of a concrete structure is effectively prolonged, and a reliable guarantee is provided for infrastructure construction.

The invention discloses an autoclaved aerated concrete material and a preparation method thereof, and belongs to the technical field of novel building materials. The graphene oxide loaded calcium carbonate and the graphene oxide are added into the material provided by the invention, nucleation sites generated by the graphene oxide loaded calcium carbonate cause a deep microstructure of the material to directionally generate a fiber-like nanoneedle-shaped multi-stage micro-nano structure, and nanowires are split from tips of the nanoneedle-shaped structure and are filled in capillary pores and microscopic pores, so that the nanowires are uniformly dispersed in the micro-pores and the micro-pores; the appearance of a meniscus is effectively avoided, the compactness is increased, the pressure of capillary pores can be further dispersed by the nanowires, and the pressure difference of the capillary pores is reduced, so that drying shrinkage is avoided. The graphene oxide ions can reduce the gravitation between the colloidal particles and block the distance between the particles, so that drying shrinkage is further avoided. Therefore, the material provided by the invention can effectively solve the cracking problem caused by drying shrinkage, the durability of the material is improved, and the service life of the material is prolonged.

The invention relates to the technical field of ceramic membrane anti-pollution membrane layers, in particular to a ceramic membrane anti-pollution membrane layer for sewage treatment and a preparation process of the ceramic membrane anti-pollution membrane layer. The ceramic material comprises the following raw materials: ceramic powder; nano titanium dioxide; polyether sulfone; a surfactant; an antibacterial agent; an organic solvent; tea polyphenol powder; after the ceramic powder and the nanometer titanium dioxide are subjected to high-energy ball milling to reach the nanometer level, the specific surface area is increased, the silver ion antibacterial agent is continuously released, growth and reproduction of microorganisms on the surface of the membrane are effectively inhibited, biological pollution and blockage are reduced, various components in the tea polyphenol powder act synergistically, the effects of resisting oxidation, resisting bacteria and adsorbing organic pollutants are achieved, and meanwhile, the effect of resisting bacteria is achieved. The stability and solubility of the tea polyphenol powder are further improved through secondary combination of the citric acid, the ceramic powder and the nano titanium dioxide, the overall anti-pollution performance is enhanced, the membrane layer can keep a good anti-pollution effect for a long time in sewage treatment, the service life of the ceramic membrane is effectively prolonged, and the maintenance cost is reduced.

The invention belongs to the field of gas technical purification, and particularly relates to a honeycomb-shaped high-concentration NO2 adsorption trapping material as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) preparing adsorbent slurry by taking high-silicon molecular sieve raw powder as a raw material; (2) putting a honeycomb carrier into the adsorbent slurry for dipping and coating; and (3) naturally airing, drying and roasting the impregnated carrier to obtain the integral honeycomb-shaped high-concentration NO2 adsorbing and trapping material. On the basis of the honeycomb-shaped high-concentration NO2 adsorption trapping material (the molecular sieve silica-alumina ratio is 1000-5000), NO2 is efficiently trapped through a pressure swing adsorption technology, meanwhile, the adsorbent subjected to adsorption saturation is reversibly regenerated, high-concentration NO2 desorbed gas is obtained, NO2 recycling is achieved, NOx tail gas of a nuclear industry post-treatment plant is recycled, and the purpose of recycling the NOx tail gas of the nuclear industry post-treatment plant is achieved. A stable NO2 gas source is provided for a spent fuel post-treatment main process, the dual requirements of NO2 raw material preparation and tail gas denitration of a post-treatment plant are met, and purification and recycling of NO2 are achieved.

The invention discloses a preparation method of a bifunctional catalyst for pyridine base production, which comprises the following steps: dissolving a double-template agent in deionized water according to a fixed mass ratio, dropwise adding a silicon source solution and a NaOH solution into a double-template agent solution, adding a mixed solution of a zinc source and an aluminum source, stirring at room temperature to form gel, and drying at room temperature to obtain the bifunctional catalyst for pyridine base production. Transferring the prepared gel into a high-pressure reaction kettle, pressurizing, heating to a supercritical state, treating, taking out a sample, drying in a drying box, calcining the dried sample in a muffle furnace, removing the double template agent to obtain the Zn / Al-MCM-41 catalyst with double functions, and catalyzing formaldehyde, acetaldehyde and ammonia to synthesize pyridine base by using the Zn / Al-MCM-41 catalyst. Formaldehyde, acetaldehyde and ammonia are added into a reactor according to a molar ratio, a Zn / Al-MCM-41 catalyst is added at the same time for a catalytic reaction, and the catalytic activity and selectivity are improved by using a bifunctional catalyst for the catalytic reaction.

The application provides a pyridyl-containing covalent organic framework fiber composite film and a preparation method thereof. The preparation method comprises the following steps: mixing an amine monomer solution and an aldehyde monomer solution to perform a condensation reaction, obtaining a first mixed solution, and obtaining pyridyl-containing covalent organic framework nanoparticles after centrifugation; wherein the aldehyde monomer solution is obtained by mixing an aldehyde monomer and an acetic acid solution, and the amine monomer solution is obtained by mixing an amine monomer containing pyridyl groups and water; mixing the pyridyl-containing covalent organic framework nanoparticles and a nanocellulose solution to obtain a second mixed solution containing covalent organic framework nanocellulose; and performing film forming treatment on the second mixed solution to obtain the pyridyl-containing covalent organic framework fiber composite film. The covalent organic framework nanoparticles are combined with nanocellulose, the high crystallinity and pore characteristics of the covalent organic framework are retained, and the mechanical strength of the composite film is improved by using the mechanical properties of nanocellulose.

This invention belongs to the field of building materials technology, specifically relating to a silica-alumina material, its preparation method, and its application. The silica-alumina material comprises 10-65 parts by weight of red mud, 20-60 parts by weight of slag powder, 0-20 parts by weight of silicate cement clinker, 0.1-8 parts by weight of an activator, and 5-15 parts by weight of an expanding agent; wherein, based on the mass of the expanding agent, the expanding agent comprises 0-60 wt% aluminum sulfate, 0-70 wt% carbide slag, 0-70 wt% tricalcium aluminate, 0-60 wt% calcium sulfoaluminate, and 0-60 wt% gypsum, and the content of at least two components in the expanding agent is not zero. The silica-alumina material of this invention, with its specific components and contents, can achieve both high strength and low shrinkage. When used in cement mortar, it can enhance the density of the cement and prevent cracking, enabling the material to be used for a long time.

The invention discloses a method for determining carbazole and nine halogenated carbazoles in sediments by an internal standard method, and belongs to the technical field of carbazole detection; the determination method comprises the following steps: mixing sediments, internal standard solution, extraction solvent, metal salt and surfactant for ultrasonic extraction to obtain an extract; adding purification material to the extract and obtaining a test solution by purification; and detecting carbazole and halogenated carbazole in the test solution by gas chromatography-tandem mass spectrometry. The invention provides a method for determining carbazole and nine halogenated carbazoles in sediments by an internal standard method, which can not only effectively improve the extraction efficiency of target compounds and reduce the loss in the purification process, but also improve the test efficiency and accuracy.

The present invention discloses a molybdenum-containing mesoporous alumina molecular sieve and its preparation method and application. Based on the weight of the molybdenum-containing mesoporous alumina molecular sieve, the molybdenum content is 10wt% to 35wt%, preferably 20wt% to 25wt%; the specific surface area of ​​the molybdenum-containing mesoporous alumina molecular sieve is 250 to 450m 2 / g, pore volume is 0.20~0.35cm 3 / g. The present invention successfully introduces molybdenum into the mesoporous alumina molecular sieve in one step through a one-step gel method, and by using an additive, the interaction between alumina and molybdenum particles is enhanced, the molybdenum is evenly dispersed on the alumina, the accumulation of molybdenum on the alumina is avoided, the increase of particle size is suppressed, and combined with the regulation of preparation conditions, a molybdenum-containing mesoporous alumina molecular sieve with high molybdenum dispersion and high specific surface area can be obtained at a lower temperature. The molybdenum-containing mesoporous alumina molecular sieve of the present invention is particularly suitable as a catalytic material for the hydrodesulfurization of sulfur-containing hydrocarbons.

This invention discloses a porous carbon-supported copper catalyst, its preparation method, and its application, belonging to the field of catalyst preparation technology. The invention uses three-dimensional interconnected ordered porous carbon (NCP) with a large-pore structure as a support, tetraphenylporphyrin copper(II) and tetraphenylporphyrin as nitrogen and copper sources, and KOH or NaOH as activators. An NCP precursor adsorbed with tetraphenylporphyrin copper(II), tetraphenylporphyrin, and an alkaline component is obtained through a two-step adsorption process. This precursor is then pyrolyzed at 600-900℃ under nitrogen protection, cooled to room temperature, and washed with water to obtain the porous carbon-supported copper catalyst (NCP@NC-Cu). This catalyst retains a three-dimensional interconnected porous structure, with the active component (copper species) mainly distributed within the pores of the NCP support, and possesses a large specific surface area and abundant nitrogen. The catalyst was applied to the N-formylation reaction of amines with CO2 and H2 to prepare formamide compounds, exhibiting excellent catalytic activity, recyclability, and good substrate versatility, showing promising application prospects.

The invention discloses a catalyst for preparing acrolein and a preparation method and application thereof, and particularly relates to the technical field of catalyst preparation, the catalyst comprises a molybdenum-bismuth composite oxide, a metal oxide and a nano-structure accelerant, the metal oxide is selected from at least one of TiO2, NiO, ZnO, La2O3, CeO2, CuO, Ga2O3, MgO and SnO2 and has a crystal structure, and the nano-structure accelerant is a nano-structure accelerant. The nanostructure accelerant is nanoparticles with specific morphology, is selected from at least one of carbon nanotubes and graphene, and is uniformly dispersed in the catalyst according to a mass ratio of 0.1-5%, the crystal structure of the metal oxide is needle-shaped or sheet-shaped, the diameter of the needle-shaped metal oxide is 5-150 nm, and the length of the needle-shaped metal oxide is 0.1-50 [mu] m. The method has the remarkable beneficial effects of improving the propylene conversion rate, prolonging the service life of the catalyst, improving the selectivity, improving the mechanical strength and the like, and has important significance in promoting technical progress and industrial upgrading of acrolein production.

The application discloses a low-shrinkage high-airtightness concrete special cementing material and a preparation method thereof. The special cementing material comprises 48-63wt% low-heat Portland cement clinker, 6-14wt% sulphoaluminate cement clinker, 3-5wt% light-burned magnesia, 7-10wt% sub-micron silica fume, 9-18wt% fly ash, 6-12wt% glass powder, 2-3wt% gypsum, 0.03wt% diethanol mono-isopropanol amine and 0.1wt% pre-dispersed carbon nanotubes. The special cementing material has reasonable particle size distribution, and the components produce interactive superposition effects, complement each other and promote each other, so that the cementing material after hydration is continuously compacted, and the airtight concrete prepared by the special cementing material can maintain excellent airtight performance and volume stability at each stage.

The application discloses a kind of multi-level pore structure aerogel based on pulsed laser and preparation method and application, belong to solar energy conversion and utilization technical field.It is inorganic material containing silicon nano as freezing base element, biomass polymer is crosslinking agent, deionized water is solvent, three are uniformly mixed and stand to form hydrogel after solidification, then freeze to form ice crystal, then remove ice crystal to form micron-nanometer level porous aerogel using freeze drying technology;Finally, the micron-nanometer level aerogel obtained is customized punched using pulsed laser technology Millimeter hole, finally obtain millimeter-micron-nanometer multi-level pore aerogel.The application first uses the high single-pulse energy of laser, and the customization optimization regulation and control of millimeter level hole of aerogel is not limited by the size and shape of template, and only through simple programming can realize the diversified design of millimeter hole, which is simple, stable in process and good in reproducibility.

The invention discloses a bearing grouting material, comprising the following components by mass: 5-20 parts of ordinary Portland cement, 30-50 parts of fast-hardening high-iron sulphoaluminate cement, 3-5 parts of expansive hydration accelerator, 2-6 parts of silica fume, 30-50 parts of quartz sand, 0.2-0.6 parts of superplasticizer, 0.2-0.5 parts of retarder, 0.01-0.03 parts of viscosity modifier, 0.04-0.2 parts of early strength agent, and 0.1-0.3 parts of defoamer. The high-flexural and high-early-strength bearing grouting material of the invention has the characteristics of high early flexural strength, high compressive strength, high fluidity, self-flowing and compacting, good anti-bleeding and segregation, micro-expansion, and good long-term durability, and is suitable for gravity grouting of spherical bearings of railway bridges and highway bearings.

The invention relates to the technical field of carbon material preparation and modification, in particular to a preparation method of conductive carbon black with high specific surface area. The preparation method provided by the invention comprises the following steps: under a protective atmosphere, heating a raw material carbon black to 350-550 DEG C for first heat treatment, then heating to 800-950 DEG C for second heat treatment, and continuously heating to 1300-1600 DEG C for third heat treatment to obtain intermediate carbon black; sequentially carrying out water vapor activation and carbon dioxide activation on the intermediate carbon black to obtain the conductive carbon black with high specific surface area, the temperature of water vapor activation is 850 to 950 DEG C; the activation temperature of the carbon dioxide is 900 to 1000 DEG C. Impurities are removed through gradient heat treatment, a carbon skeleton is rearranged, and then water vapor and CO2 physical activation are utilized to cooperatively regulate and control micropore and mesoporous structures, so that the high specific surface area and the high conductivity are taken into account.

The present application belongs to the technical field of oil and gas exploitation, and relates to a nano desorption agent for gas well and a preparation method thereof. The desorption agent uses special pretreated biochar as a core carrier, loads specific proportion of bimetallic oxide nanoparticles, and is supplemented with an environmentally friendly surfactant for surface modification. Through the synergistic effect of nano size effect, catalysis / electron transfer effect of metal oxide, physical adsorption and pore transport effect of biochar, and interfacial tension reduction effect of surfactant, the adsorption energy barrier of gas molecules such as methane on the rock surface is significantly reduced, and the efficient desorption is promoted. At the same time, all components and preparation processes are environmentally friendly and harmless to human body.

This invention discloses a hierarchical guanidine resin-based CO2 adsorbent material and its preparation method, belonging to the field of polymer synthesis technology. The adsorbent material prepared by this invention has a composite spherical structure and a hierarchical pore structure, including micropores, mesopores, and macropores. By introducing a hierarchical pore structure, the adsorption capacity of the material for CO2 is effectively improved. The introduction of hierarchical pores can significantly reduce molecular diffusion resistance and increase the contact area between the adsorbent and CO2 molecules, thereby achieving rapid adsorption. Furthermore, pyridyl, polyamino compounds, and guanidine groups have strong basicity and chemical affinity for CO2. Through surface functionalization modification, the number of active sites on the material surface is significantly increased, thereby further improving the CO2 adsorption capacity and selectivity.

This invention provides a ceramic proton exchange membrane for microbial fuel cells and its preparation method, comprising the following steps: mixing clay, an inorganic modifier, and an organic modifier to obtain a solid powder; the inorganic modifier is alumina and silicon dioxide, and the organic modifier is selected from one or more of wheat flour, biochar powder, straw powder, and bamboo powder; the solid powder is ball-milled, granulated, pressed into sheets, and calcined to obtain the ceramic proton exchange membrane. This invention addresses the problems of poor mass transfer performance and low power generation performance of traditional pure clay ceramic membranes. Using clay as the matrix material, and through specific inorganic and organic modifiers, the pore structure of the material is adjusted. A novel ceramic proton exchange membrane is then prepared through ball milling, granulation, pressing, and calcination. This membrane has low manufacturing cost, good proton transport efficiency, and extremely low internal resistance. When applied to microbial fuel cells, it can achieve higher output voltage and more stable power generation performance.

The invention provides a method for preparing a novel mixed matrix membrane by irradiating a micromolecule and self-polymerizing a microporous polymer membrane. According to the method, different types of olefin small molecules and different types of polymer membranes are taken as substrates, and due to a special molecular structure, high-yield in-situ polymerization of small molecule compounds is induced by radiation, and the small molecule compounds are deposited in polymer membrane chains in situ. The pore channel structure of the self-polymerized microporous polymer is adjusted by utilizing the content of the newly obtained polymer, and the pore channel beneficial to gas screening is obtained. The method has the advantages that operation is simple, raw materials are cheap and easy to obtain, and the prepared mixed matrix membrane is free of defects, excellent in performance and the like, and has good industrial application prospects.

The invention relates to the technical field of coal gangue activation, in particular to a coal gangue activating and calcining method which comprises the following steps: pretreating coal gangue, adding a sodium hydroxide solution and an auxiliary agent into the pretreated coal gangue, and mixing and stirring to obtain a mixture; calcining the mixture to obtain coal gangue clinker; according to the method, the dispersity of the coal gangue is improved through treatment of the auxiliary and sodium hydroxide, agglomeration among particles is avoided, sodium hydroxide reacts with SiO2 in the coal gangue to generate sodium silicate, the chemical activation process is initiated, and then through calcination and acid leaching, the coal gangue can be effectively activated. Active sites of the coal gangue are increased, the surface property of the coal gangue is changed, an aluminate hydration product with a gelling effect is generated in the calcining process, and the activation effect of the coal gangue is improved.

The invention discloses a preparation method of a PPTA composite nanofiltration membrane with pore size optimized by a hydrogel mosaic structure, and compared with a PPTA composite nanofiltration membrane without pore size optimization of a mosaic structure, the PPTA composite nanofiltration membrane prepared by the method has the advantages that the pore size distribution and the structural stability of the membrane pore size are obviously improved under the optimization of the hydrogel mosaic structure; the permeation flux and interception are obviously improved; the prepared nanofiltration membrane with the optimized pore diameter can be used in the field of membrane separation, for example, the nanofiltration membrane is used for drinking water purification, industrial water treatment, seawater desalination and wastewater treatment in the water treatment industry, the water quality is improved, and the requirements of different purposes are met. The method can also be used in the fields of biological pharmacy, chemical dye industry and the like, and has good application prospects.

This invention discloses a catalytic flue gas desulfurizing agent and its preparation method, belonging to the field of flue gas desulfurization technology. Specific steps include: mixing a carrier with a glucose aqueous solution, molding the mixture, and then subjecting it to drying and calcination. The carrier is then impregnated with an active metal impregnation solution, followed by drying and calcination to finally obtain the catalytic flue gas desulfurizing agent. The carrier is prepared by forming particles in a granulation container using a specific doping composition and a curing agent, followed by calcination. Compared with existing technologies, the catalyst of this invention maintains a high specific surface area and an open mesoporous structure at high temperatures, enhancing mass transfer efficiency and mechanical strength, significantly improving the dispersibility of active components and the diffusion efficiency of reactants, achieving excellent desulfurization effects, and showing promising industrial application prospects.

This invention discloses a nano-modified composite grouting material suitable for deep, high-temperature geothermal environments and its preparation method, belonging to the field of geotechnical engineering technology. The raw materials for preparing this composite material include: cement, fly ash, cellulose nanofibers, Pluronic F-127 dispersant, calcium formate, tannic acid, borax, defoamer, and water; wherein the mass ratio of tannic acid, calcium formate, and borax is (0.15-0.25):(1.1-1.4):(0.1-0.2). This invention, through the compounding of specific admixtures, effectively overcomes the defects of traditional grouting materials, such as rapid setting at high temperatures and poor rheological properties. The resulting composite material exhibits low viscosity, long pumpability, and high early strength in high-temperature environments, significantly improving the reinforcement effect on deep, high-temperature rock masses and providing a high-performance, high-reliability grouting solution for deep underground engineering.

The present application relates to the technical field of concrete materials, and specifically discloses an underwater non-dispersible concrete and a preparation process thereof. The underwater non-dispersible concrete comprises the following raw materials: cement, mineral admixture, coarse aggregate, fine aggregate, water reducer, early strength agent, retarder, water, anti-dispersant and composite fiber, wherein the anti-dispersant mainly comprises polyacrylate, vinyl neodecanoate and pentasodium diethylenetriamine pentaacetate; the preparation process comprises the following steps: mixing cement, early strength agent, retarder and anti-dispersant with composite fiber to obtain mixture A; mixing coarse aggregate and fine aggregate and mineral admixture to obtain mixture B; mixing mixture A and mixture B, and then adding the water reducer mixed with water, mixing, and obtaining underwater non-dispersible concrete. The present application has the characteristics of improving the anti-dispersibility and compressive strength of underwater non-dispersible concrete.

The present invention relates to a method for preparing a carboxylated polyaniline / phosphorus-doped graded porous carbon / MoS2 integrated membrane electrode, comprising the following steps: S1, preparation of phosphorus-doped graded porous carbon; S2, preparation of phosphorus-doped graded porous carbon / MoS2; S3, preparation of phosphorus-doped graded porous carbon / MoS2 electrode; S4, preparation of carboxylated polyaniline / phosphorus-doped graded porous carbon / MoS2 integrated membrane electrode. The present invention uses phytic acid with a high phosphorus content as a phosphorus source and F127 as a template to prepare phosphorus-doped graded porous carbon, thereby improving the pore structure and hydrophilicity of the carbon material and increasing pseudocapacitance; phosphorus-doped graded porous carbon is composited with MoS2 with a high specific capacitance, which can significantly improve the specific capacitance of the electrode material. The carboxylated polyaniline membrane is modified on the surface of the graded porous carbon / MoS2 electrode as an ion exchange membrane by a constant potential method to construct an integrated membrane electrode, which can significantly improve the electrode specific capacitance, hydrophilicity and ion exchange membrane selective permeability, thereby improving the desalination performance of MCDI in treating low-concentration uranium-containing wastewater.

The invention belongs to the technical field of electrode materials, and particularly relates to a cathode material, a preparation method and application thereof, and a microbial fuel cell. The cathode material comprises a stainless steel fiber felt, and manganese dioxide, a conductive agent and a binder which are loaded on the stainless steel fiber felt, the conductive agent is carbon black; the binder is polytetrafluoroethylene, has excellent electron transmission capability and oxidation reduction reaction (ORR) performance, can improve the output work density of the microbial fuel cell, and also can enhance the purification effect of the microbial fuel cell on heavy metal-containing wastewater.

The invention discloses a bimetallic Co / Mn-MOF / ZnAl-LDHs material and application thereof, and belongs to the technical field of wastewater treatment. The Co / Mn-based metal organic framework grows in situ on the ZnAl-LDHs carrier through a hydrothermal method, so that the prepared Co / Mn-MOF-ZnAl-LDHs inherit the advantages of the spatial structure of MOF and the arsenic affinity of LDHs, rich adsorbent active surfaces contain functional groups such as-OH, M-O-M and Co / Mn-O, arsenic in complex wastewater can be separated and removed with high selectivity, and the preparation method is simple and economical. Therefore, the prepared Co / Mn-MOF (at) ZnAl-LDHs adsorbent can be used as a potential heavy metal scavenging agent for treating heavy metal polluted underground water or industrial wastewater.

The invention relates to the field of activated carbon, and in particular to a high-strength and high-efficiency asphalt-based spherical activated carbon, which is used to solve the problems of low strength, low surface chemical activity, small specific surface area and poor adsorption performance of existing asphalt-based spherical activated carbon, thereby limiting the application scope thereof. After being treated with hydrogen peroxide solution, urea and sulfur powder, the high-efficiency asphalt-based spherical activated carbon can be doped with a large amount of oxygen, nitrogen and sulfur elements into the activated carbon, thereby improving its reaction activity and the adsorption effect of the activated carbon. After being treated with nano-silicon dioxide, the specific surface area, pore volume and pore size distribution inside and on the surface of the activated carbon can be increased. Therefore, while simultaneously improving the activity and specific surface area of ​​the activated carbon, the activated carbon of the invention has high strength, high specific surface area and high adsorption performance, can be used in the fields of water treatment, air purification, desulfurization and denitration, and has higher use performance and wider application prospects.