101results about How to "Reasonable pore size distribution" patented technology

The invention relates to a carbon fiber wetland type ecological floating bed and an arrangement method thereof, belonging to the field of sewage treatment. The carbon fiber wetland type ecological floating bed comprises a bed body, a biological carbon fiber material, floating bed plants and a wetland tank, wherein the wetland tank is arranged in the bed body; the interior of the wetland tank is filled with a porous light-weight artificial wetland filler; the floating bed plants are planted in the middle of the filler; and the biological carbon fiber material is hung on a suspension rod at the bottom of the wetland tank. According to the carbon fiber wetland type ecological floating bed, the processes of the ecological floating bed, bio-contact oxidation and the artificial wetland are reasonably combined to ensure that sewage is firstly subjected to bio-contact oxidation to degrade most pollutants, then the sewage is intercepted and further degraded through the wetland structure, and finally, through the absorption effect of plant roots, the quality of the sewage is better improve; and meanwhile, the reasonable layout of plants can be used for achieving the purposes of beautifying the environment, improving the ecological diversity and promoting the degradation effect on the pollutants of the whole floating bed system.

The invention relates to modified biomass charcoal and a remediation method of heavy metal contaminated soil. The modified biomass charcoal is prepared by the following steps: (1) sieving biomass charcoal, and washing so as to remove surface fly dust and impurities until the pH value of a scrubbing solution is 6.5-7.5; (2) uniformly mixing the biomass charcoal and a phosphoric acid solution according to the mass ratio of 1 to (1.5-2.5), and then soaking at room temperature for 24 hours above, wherein the mass percent concentration of the phosphoric acid solution is 10-40%; and (3) carrying out solid-liquid separation on the soaking solution, and then drying the obtained a solid material, namely the modified biomass charcoal. The modified biomass charcoal is reasonable in design, is simple in technology, and overcomes the technical difficulty for a long time; phosphoric acid is detained in the biomass charcoal in the form of metaphosphoric acid, and especially can form sediment substances together with active heavy metal ions under a water containing condition, thereby intensifying the passivation or fixing effect to the heavy metal ions by the biomass charcoal.

The invention provides composite petroleum coke-based activated carbon and a preparation method thereof. Activated active sites can be formed on the surface of petroleum coke through the dipping, coking and pre-activating processes of an oxidizing medium, chemical activation part pore-forming is promoted, the use amount of alkali is reduced, the mesopore rate is increased, and the problem that due to the fact that the surface of the petroleum coke is compact, pore forming is difficult is solved. Graphene oxide is reduced into graphene, a conductive network is formed, the conductivity of the activated carbon is improved, and the internal resistance of the activated carbon is reduced. High-temperature heat treatment is carried out jointly, surface functional groups are reduced, and the stability of super-capacitor carbon is improved. The prepared composite petroleum coke-based activated carbon has the advantages of being reasonable in pore size distribution, large in specific surface area, low in internal resistance, high in capacity, low in impurity and low in oxygen-containing functional group and can serve as the super-capacitor carbon, and the super-capacitor with better performance is obtained.

The invention relates to a method for preparing nitrogen-doped activated carbon by utilizing a PET (polyethylene terephthalate) waste material and belongs to the technical fields of chemical industry and environmental protection. The method provided by the invention comprises that low-temperature preoxidized PET waste material and a nitrogen source are mixed, then carbonizing treatment is carried out in inert atmosphere, and activating treatment is carried out on carbonized product by adopting a physical activation method or a chemical activation method, so that the nitrogen-doped activated carbon is obtained. The method provided by the invention has the advantages that the PET waste material is taken as a carbon source, organic amine or inorganic ammonium salt is taken as the nitrogen source, and the characteristics of low production cost and simple preparation process are achieved; and the nitrogen-doped activated carbons with different nitrogen contents and specific surface areas can be prepared by controlling the ratio of the carbon source to the nitrogen source and selecting an appropriate activation method. The prepared nitrogen-doped activated carbon can serve as an electrode material, a catalyst carrier and an adsorbent. The invention provides a convenient and feasible method for utilizing the PET waste material.

The invention provides a biological activated carbon fiber, an ecological carbon fiber composite comprising the same and a preparation method thereof. The preparation method of the biological activated carbon fiber comprises the steps of, after polyacrylonitrile fibre, the viscose fiber and the pitch fiber to 200 to 300 DEG C in the rate of 3 to 5 DEG C / min, performing preoxidation treatment for 50 to 150 min and to form a preoxidized fiber; in a nitrogen atmosphere, gradually warming the preoxidized fiber to 700 to 800 DEG C in the rate of 10 to 30 DEG C / min, performing charring and activating treatment for 30 to 90 min using water vapor as an activator, to form the biological activated carbon fiber. The specific surface area of the biological activated carbon fiber is more than 1000 m2 / g and is reasonable in pore size distribution and high in adsorbability. By adopting the biological activated carbon fiber in sewage disposal, a membrane structure can be formed and the removal rates of CODcr and ammonia nitrogen can both be evidently enhanced after membrane formation.

The invention discloses a super capacitor device containing a millet-husk-based porous active carbon material. The millet-husk-based porous active carbon material is prepared by uniformly mixing dried millet husks and an activator, performing carbonization and activation with a microwave device in the protection of an inert gas, adding distilled water to obtained black powder for suction filtration washing till the pH value is 6.4-7, and performing drying to obtain black powder. The black powder is the prepared millet-husk-based porous active carbon material. The millet-husk-based porous active carbon material (an active substance) prepared through the microwave method is mixed with a binder according to a certain mass ratio, distilled water is added for mixing to prepare a thick liquid, and the thick liquid is repeatedly rolled to obtain a sheet electrode material. The electrode material is put on a current collector with the corresponding size, cold pressing is carried out at 1-40 Mpa for 10-200 s, and drying is performed at 120 DEG C to obtain an electrode plate of the super capacitor device. The electrode material in the electrode plate is more than 14 mg per square centimeter. An electrode plate, a membrane, and an electrode plate are assembled into a sandwich structure, then different electrolytes are dropwise added, so that the super capacitor device is assembled.

The invention provides an ecological carbon-fiber composite, a preparation method thereof and a sewage treatment reactor containing the ecological carbon-fiber composite. The ecological carbon-fiber composite comprises a core layer which is composed of biologically active carbon fibers with a specific surface area of greater than 1000 m<2> / g and an external layer which is composed of an eyelet fabric of polypropylene fibers, wherein the external layer is wrapped around the core layer. According to the invention, the biologically active carbon fibers with a specific surface area of greater than 1000 m<2> / g are used as the core layer, and the polypropylene fiber eyelet fabric is arranged at the external side of the core layer so as to strengthening the core layer; therefore, the ecological carbon-fiber composite has the advantages of a great specific surface area, reasonable pore size distribution, high adsorptivity and high strength, so the composite is sturdy and durable, is convenient to clean and maintain, does not easily hide sludge, enables replacement frequency to be reduced and has a prolonged service life.

The invention discloses a catalyst for anthraquinone degradation product regeneration, wherein the content of alumina in the catalyst is 93 to 97 wt percent; the content of macropore above 75 nanometers in the catalyst is more than 5 percent; moreover, pore volume is more than 0.42ml / g, and micropore size distribution is mainly concentrated between 50 and 100. The invention also discloses a preparation method of the catalyst. The method comprises: a, crushing and roasting aluminium hydroxide to obtain raw powder; b, mixing the 85 to 95 wt percent raw powder obtained after roasting with 5 to 15 wt percent pseudoboehmite to prepare pellet on a pelleter; c, feeding the obtained pellet into rolling or rotating equipment to carry out surface treatment; d. storing the pellet at room temperature after surface treatment; e, carrying out water washing of the pellet obtained after storing in step d, by use of water below 80 DEG C; and f, roasting the pellet after water washing. The catalyst ensures that the reduction regeneration yield of anthraquinone degradation product reaches above 10 g / L, and effectively inhibits side reaction; moreover, product abrasion wear is less than 0.3 percent.

The present invention discloses a multifunctional ecological floating island. The floating island consists of several floating island units, which are fixed by the connecting plates in fastening; each floating island unit includes a hexagonal floating body frame and a provided with a plurality of planting baskets in the floating body frame; the planting basket is a regular hexagon basket with grid network on the bottom, and modified carbon fiber grass hangs below every corner of the basket; the modified carbon fiber grass is obtained by high temperature carbonization, activation, surface modification and microorganism fixing on carbon fibers; the bottom of each planting basket is covered with a filling substrate, and aquatic plants are planted on the substrate; and the plurality of planting baskets are arranged in the hexagonal floating body frame to form an integral structure. The ecological floating bed of the present invention has a stable hexagonal structure, combines floating island technology, micro-dosing technology and biological film together, and can adsorb, absorb and decompose various pollutants, beautify the urban river way or landscape water, and normally play strong power in winter.

Polyethylene glycol terephthalate (PET) is plastic which is applied widely, the used waste PET is not rotted and difficult to degrade under the natural conditions and therefore causes serious environmental problems, however, the PET has environmental and economical dual benefit after being chemically modified and recycled. The process of preparing the active carbon from the waste PET is divided into carbonizing and activating two steps. The carbonizing process is mainly used for generating a carbon material by the raw material PET, and the activating process ensures that the carbon material is activated by an activating agent and that a duct structure is generated. In the carbonizing process, the temperature is 450 to 600 DEG C, the time is 90 to 150 minutes, and an alkali carbon ratio of 3-5: 1; and in the activating process, a chemical activation method is adopted, K2CO3 is used as the activating agent, the activating temperature is 750 to 850 DEG C, and the activating time is 45 to 75min. Through the treatment of the two processes, the active carbon with relatively high specific surface area and a relatively good aperture structure is prepared from the waste PET.

The invention discloses an autoclaved ceramic powder aerated concrete self-insulating block. The self-insulating block is prepared from the following raw materials in parts by weight: 45-66 parts of ceramic slag powder, 10-15 parts of quick lime, 6-10 parts of cement, 3-5 parts of gypsum, 2-5 parts of aluminum powder, 3-6 parts of ferrosilicon powder, 15-25 parts of waste slurry, 0.3-0.6 part of an additive and 50-120 parts of water. An ultrafine powder slurry aeration molding method is established, the bottleneck of an ultrafine powder application problem in the field of aerated concrete thatthe size of a silicon material is always considered to not be less than 180-200 meshes can be overcome by utilizing multiple additives, and the problems of fine size of ceramic slag powder, large specific surface area, high water absorption rate, dispersing difficulty, large viscosity and poor slurry pouring stability can be effectively solved.

The invention provides a method for preparing a composite pitch-based activated carbon. In the invention, graphene oxide and pitch coke are reduced and activated through high-temperature coking, and graphene oxide forms a uniform network inside the pitch coke; at the same time, after high-temperature activation and high-temperature Reduction, graphene oxide removes most of the oxygen to form graphene, so that a good conductive network is formed inside the activated carbon and the internal resistance of the activated carbon is reduced. The preparation method provided by the present invention effectively solves the problem that the existing activated carbon is mainly composed of micropores, the pore size distribution is unreasonable, the proportion of alkali used in the preparation process is relatively high, and the performance of activated carbon still cannot meet the requirements for capacity and internal resistance. Big question. The composite pitch-based activated carbon prepared by the invention has the advantages of reasonable pore size distribution, large specific surface area, low internal resistance, high capacity, low impurities and low oxygen-containing functional groups, and can be used as supercapacitor carbon to obtain supercapacitors with better performance.

The invention provides a bio-carbon-fiber flat membrane component and a sewage treatment reactor, wherein the bio-carbon-fiber flat membrane component comprises a substrate, a bio-carbon-fiber composite material and a filtering membrane; the bio-carbon-fiber composite material is arranged on the substrate; and the filtering membrane is arranged on one side, far away from the substrate, of the bio-carbon-fiber composite material. According to the bio-carbon-fiber flat membrane component, the filtering membrane and the bio-carbon-fiber composite material are reasonably combined together, sewage is firstly filtered by the filtering membrane and then is further absorbed and purified by the bio-carbon-fiber composite material, so that the purity and cleanness of clean water are further improved, and the stain resistance, membrane flux and service life of the flat membrane component are improved.

The invention belongs to the technical field of materials, in particular to a method for preparing hierarchical porous nano carbon materials. The method comprises the following steps of: (1) preparing organosol; (2) aging the organosol prepared in the step (1) to prepare an organic aerogel; (3) vacuumizing the organic aerogel prepared in the step (2), keeping constant temperature and drying; (4) performing primary carbonization on a product prepared in the step (3); (5) performing ball milling on a product prepared in the step (4); (6) soaking a product prepared in the step (5) in a mixed acid solution, washing until the pH value is 6 to 7, filtering, vacuumizing, keeping constant temperature and drying; (7) adding a KOH solid and deionized water into a product prepared in the step (6) for mixing to obtain a paste, vacuumizing, keeping constant temperature and drying; and (8) performing secondary carbonization on a product prepared in the step (7). By the method, the specific surface area of a carbon aerogel material can be obviously increased, the pore diameter distribution is improved, and the specific capacitance and high-power charge-discharge performance of a carbon aerogel electrode material are improved.

The invention relates to a porous polymer material used for preparing a supercapacitor electrode and a preparation method thereof. Nucleophilic substitution reaction is carried out on bisphenol-like monomer containing a bis-phthalazinone structure and 4-halobenzonitrile in an aprotic polar solvent under the catalytic action of alkali metal halide, so that a series of novel dinitrile monomers containing the bis-phthalazinone structure are obtained; high temperature polymerization is carried out on the novel dinitrile monomers under the catalytic action of Lewis acid, so that a porous polymer material containing the bis-phthalazinone structure and a s-triazine structure is obtained; and the porous polymer material is assembled into a supercapacitor, and electrical properties of the supercapacitor are tested. The preparation method of the porous polymer material is simple and easy to control, and implementation of an engineering technology is facilitated; and the supercapacitor prepared from the porous polymer material has the characteristics of high specific capacitance (the specific capacitance is 378F / g when the current density is 0.1A / g) and excellent cycling stability (the specific capacitance is not attenuated after charging and discharging are carried out for 10000 times).

The invention belongs to the technical field of preparation of activated carbon materials and particularly relates to activated carbon for a supercapacitor and a preparation method and application ofactivated carbon. Different activators are used for performing gas activation on carbonized materials twice, the carbonized materials are activated into activated carbon with mesoporous and microporous structures, a large-area space is provided for charge storage, and a rapid transport channel is also provided for electrolyte ions, so that increase of the specific capacitance of the supercapacitoris facilitated. Results of the embodiment show that when activated carbon obtained by the method is used as an electrode material of the supercapacitor, a 2 mol / L of 1-ethyl-3-methylimidazolium tetrafluoroborate / acetonitrile solution is used as an electrolyte, and when the sweep rate is 5 mV / s, the specific capacitance of the supercapacitor reaches 110-186 F / g.

The invention relates to a preparation method for nanoscale alumina powder. The method includes allowing the reaction between aluminum powder and solvent n-hexanol to prepare an aluminum alkoxide compound, hydrolyzing, distilling, separating, and roasting to prepare nanoscale alumina powder product. The invention has no need for catalyst removal, has no need for large amount of water to wash away the impurities in the material, reduces the discharge of wastewater, reduces pollution and saves the production cost; in the production process, the used alcohol can be recycled (with recovery rate at 90%), to greatly reduce the production cost; and the product has low impurity content, large pore volume, large specific surface, and reasonable pore size distribution, and can be used as an industrial catalyst carrier.

The invention discloses a network polymer material applied to a super capacitor electrode and provided with nitride and oxygen atoms and a preparation method thereof and belongs to the field of material science. The network polymer material provided with the nitride and oxygen atoms is a network polymer with phthalazone and s-triazine structures and has a repetitive unit structure expressed as formula I. The preparation method of the network polymer material comprises the following steps: step one, taking a halogen compound with a phthalazone structure as the raw materials and carrying out coupling reaction to generate a dinitrile monomer; and step two, taking the dinitrile monomer as the raw material and carrying out polymerization reaction to generate the network polymer with phthalazone and s-triazine structures. A super capacitor taking the material as the electrode has the characteristics of high specific capacitance and excellent cycling stability; when the current density is 0.1A / g, the specific capacitance is 302F / g; the specific capacitance of the super capacitor is free of attenuation after 30000 charging and discharging cycles.

The invention discloses a porous biomass carbon electrode material derived from wheat straws and a preparation method thereof, belonging to the technical field of electrode material preparation. The method for preparing the wheat straw comprises mixing wheat straw, citric acid and NaH2PO4 according to a certain mass ratio, and stirring the mixture to form a slurry. The slurry is then lyophilized and carbonized. The porous biomass carbon electrode material suitable for supercapacitor can be obtained by mixing carbonized product and KOH according to a certain mass ratio and activating at high temperature. The obtained electrode materials have excellent electrochemical properties at 1.0 Ag<-1>, the specific capacitance can reach 294 Fg<-1>, even at current densities up to 15 Ag<-1>, the specific capacitance can still reach 200 Fg<-1>. Effective utilization of biological waste resources is effectively realized, not only is new value created, but also environmental pollution are effectivelyreduced.

The invention belongs to the field of lead acid battery materials and particularly relates to a preparation method of a high-dendritic-crystal-resistance short circuit baffle plate. The preparation method of the high-dendritic-crystal-resistance short circuit baffle plate provided by the invention comprises the following steps of: pulping raw materials including 4-6 parts of 42-45 degrees glass fiber, 23-27 parts of 34-36 degrees glass fiber, 36-42 parts of 27-30 degrees glass fiber, 22-24 parts of reclaimed materials and 2.5-3.5 parts of organic fiber PET (polyethylene glycol terephthalate); mixing pulp, molding, drying to obtain the finished product. The puncture-resistant capability of the baffle plate can be improved; the pore diameter distribution of the baffle plate is more reasonable and has very high homogeneity; the short circuit caused by lead dendritic crystal growth in a battery can be prevented; meanwhile, the tensile strength and the elongation of the baffle plate can be improved; the short circuit caused when the baffle plate is torn off or pierced during the assembly process can be prevented; the service life of the battery is prolonged greatly.

The invention relates to a nitrogen-oxygen co-doped activated carbon aerogel electrode material, a solid super-capacitor, and a preparation method for the nitrogen-oxygen co-doped activated carbon aerogel electrode material. The method comprises the steps: preparing polyaniline-sodium alginate hydrogel, preparing polyaniline-sodium alginate aerogel, mixing the prepared polyaniline-alginate aerogelwith a conductive agent and a binder, coating a current collector with the mixture, and performing drying to obtain a supercapacitor electrode piece. The solid super-capacitor provided by the invention comprises two electrode pieces and a gel polymer electrolyte between the two electrode pieces. The electrode pieces are the aerogel electrode materials prepared through the above methods. The marine nitrogen-oxygen co-doped activated carbon aerogel for the prepared solid super-capacitor is large in specific surface area, is reasonable in aperture distribution, is high in content of nitrogen-oxygen doping, is unique in ultramicropore structure, is good in wettability, and is small in equivalent series resistance. The super-capacitor electrode material is very high in specific capacitance, isvery high in energy density, power density and is excellent in coulombic efficiency.

The invention relates to activated carbon. The activated carbon is prepared from the following raw materials in parts by mass: 70-80 parts of wood charcoal powder, 1-6 parts of a normal-temperature binder, 15-20 parts of a high-temperature binder, 3-5 parts of a tackifier, 0.5-1 part of an extrusion aid, 0.1-0.5 part of a coupling agent and water accounting for 35-45% of the total mass of the components. The invention also relates to a preparation method of the activated carbon. The preparation method comprises the following steps of: pulverizing, screening, proportioning, mixing, kneading, aging, carrying out extrusion molding, drying, carbonizing and activating at the same time. High-temperature asphalt, sodium humate and sulfonated phenolic resin are used for replacing dangerous chemical coal tar to serve as adhesives, VOCs gas emission in the preparation process is reduced, environmental pollution is reduced, the adhesion effect of the adhesives is improved through a tackifier anda coupling agent, the abrasion resistance and the adsorption capacity of the activated carbon are improved, the abrasion resistance of the activated carbon reaches 98%, the iodine value of the activated carbon can reach 900 mg / g, the ash content of theactivated carbon is smaller than 10%. The method can be used for some application scenes with high requirements for the abrasion resistance and theadsorption capacity of the activated carbon, such as desulfurization and denitrification catalysts and gold extraction.

The invention provides an electrode material as well as a preparation method and the application thereof. The electrode material takes coal pitch as a carbon source, takes nano calcium oxide as a template agent and takes potassium hydroxide as an activating agent. The preparation method comprises the following steps: S1, weighing the raw materials in parts by mass; S2, grinding the raw materials into powder and mixing; S3, putting the mixed sample into a tubular furnace, and introducing inert gas; S4, heating and carbonizing; S5, performing acid pickling to remove nano calcium oxide; s6, washing with distilled water; S7, drying the electrode material. The electrode material prepared by the method has the characteristics of large specific surface area, proper pore size distribution range and high oxygen element content, so that the electrode material is high in specific surface area utilization rate, high in specific capacitance, high in energy density and good in cycle performance. Thematerial can be used as an electrode material for a supercapacitor.

A method for making activated carbon materials for organic supercapacitors from straws, characterized in that crop straws are selected as raw materials, and the activated carbon materials for organic supercapacitors are obtained through the process steps of drying and crushing, carbonization, and activation in sequence. The activated carbon prepared by the method of the present invention has a large specific surface area, and when 1.2mol / l MeEt3NBF4 / AN is used as the electrolyte, the cyclic voltammetry test is carried out, and the specific capacitance is 232F / g at 2mv / s, which is suitable as an electrode material for organic supercapacitors .

The invention discloses an autoclaved porcelain powder aerated concrete insulation board. The autoclaved porcelain powder aerated concrete insulation board is prepared from the following components inparts by weight: 23-50 parts of ceramic waste residue powder, 10-15 parts of quicklime, 15-20 parts of cement, 2-4 parts of gypsum, 3-5 parts of calcium carbonate, 2-5 parts of aluminum powder, 3-6 parts of ferrosilicon powder, 5-8 parts of SiO2, 2-4 parts of MgO and 40-100 parts of water. According to the autoclaved porcelain powder aerated concrete insulation board, the superfine ceramic wasteresidue powder, the aluminum powder and a ferrosilicon powder foaming agent are adopted, a plurality of additives are added, a superfine powder slurry foaming forming method is established, so that the problem that the pouring stability of low-density 160-200 kg / m<3> slurry is poor can be solved, a blank forms a porous structure with solid pore wall, high closed pore percentage, small pores, thinpore wall, circular pore shape and uniform size, and therefore good thermal insulation performance is achieved.

The invention relates to a method for preparing mesoporous carbon powder with a high specific surface area, and belongs to the technical field of carbon material preparation. The process comprises thefollowing steps: preparing metal nitrate, fuel, a soluble organic carbon source and other raw materials into a solution according to a certain proportion; heating the solution to react to obtain a precursor; calcining the precursor for 1-4 hours in a protective atmosphere at the temperature of 700-1400 DEG C to obtain a metal oxide / carbon intermediate product; and soaking in hydrochloric acid toremove the metal oxide on the carbon matrix, and drying to obtain the mesoporous carbon powder material with high specific surface area. The method is simple in process, easy to control in operation and low in cost, and the prepared mesoporous carbon has high specific surface area, large pore volume, uniform particle size, high purity, good dispersity and controllable pore diameter, and can be effectively applied to the environmental fields of organic pollutant adsorption and the like.

The invention provides a method for modifying activated carbon for a supercapacitor by hydrogen peroxide. The preparation method comprises the steps as follows: (1) oxidation pretreatment of activated carbon: a hydrogen peroxide solution is added into high-specific-area activated carbon whose specific area is larger than 2,000m<2> / g and micropore content reaches higher than 90%, and an activated carbon dispersion is obtained, wherein the concentration of the hydrogen peroxide is 10%-50%; (2) ultrasonic treatment: an ultrasonic irradiation treatment is performed on a beaker filled with the activated carbon dispersion under appropriate ultrasonic power, wherein the temperature for ultrasonic treatment ranges from 50 DEG C to 90 DEG C, and the treatment time is 30 min to 60 min; and (3) activated carbon after filtering is placed in a vacuum drying oven and baked for 12 h at 120 DEG C, residual hydrogen peroxide is further decomposed, and the activated carbon for the supercapacitor is obtained.

The invention relates to a lithium-rich manganese-based cathode material with a crosslinking structure and a preparation method thereof. The preparation method specifically comprises the following steps of (1) preparing a mixed reaction solvent of deionized water and organic alcohol; (2) mixing and dissolving soluble nickel, cobalt and manganese salts into the mixed reaction solvent; (3) heating the mixed reaction solvent to the reflux state by a microwave radiation manner; (4) under the continuous reflux state, adding an alkaline resource, and maintaining reaction, so as to obtain a nickel, cobalt and manganese hydroxide precursor; (5) fully mixing the nickel, cobalt and manganese hydroxide precursor and a lithium source, and calcining, so as to obtain the final lithium-rich manganese-based cathode material. The prepared lithium-rich manganese-based cathode material has the advantages that a crosslinking net-shaped structure is formed, the pore radius is rich, the crystallizing degreeis high, and the lithium ions are quickly disembedded and embedded at low resistance; the method for preparing the precursor of the lithium-rich manganese-based material is simple, the time is short,the organic solvent can be repeatedly recycled and used, the cost is reduced, the environment-friendly effect is realized, and the production efficiency is greatly improved.

The invention discloses a cobalt-based Fischer-Tropsch synthesis catalyst and a preparation method thereof. The cobalt-based Fischer-Tropsch synthesis catalyst comprises a carrier, an active component cobalt, a first assistant and a second assistant, wherein the carrier is a ZnO and TiO2 and / or ZrO2 modified Al2O3 carrier. Stepwise impregnation is used to respectively sequentially load the active component cobalt and the first assistant and load the active component cobalt and the second assistant on the carrier, and the carrier and the assistants synergistically act to make the cobalt-based Fischer-Tropsch synthesis catalyst have good anti-sintering ability and a good hydrothermal stability and have a good catalytic performance in the Fischer-Tropsch synthesis reaction. The preparation method has the advantages of simple preparation process, no pollution to the environment, and good industrial application prospect.

The invention discloses an adjustable biological aerated filter. The adjustable biological aerated filter comprises a tank body, wherein a precise filter board, a filter material layer and a filter material layer adjusting control board are arranged on the tank body from bottom to top in sequence, so that the tank body is divided into a water distributing region below the precise filter board and a clear water region above the filter material layer adjusting control board; the water distributing region is communicated with a water inlet tube; a water outlet slot is arranged on the upper part of the clear water region; the water outlet slot is communicated with a water outlet tube; nanometer microcrystal filter material is placed in the filter material layer. The adjustable biological aerated filter can be used for controlling and adjusting the height of the filter material layer by adopting the filter material layer, so that the reaction region height can be adjusted according to inlet water ammonia-nitrogen change, and therefore, the adjustable biological aerated filter has stable outlet water quality.