55results about How to "Many pores" patented technology

The invention provides a preparation method of a water and fertilizer retention type soil amendment, and belongs to the technical field of soil amendments. Biomass polysaccharide with abundant carboxyl functional groups is combined with metal ions to form a three-dimensional network structure capable of effectively coating soil nutrients; meanwhile, the soil conditioner is endowed with obvious pH responsiveness, and targeted remediation can be performed according to different soil conditions; the biomass-based soil conditioner provided by the invention has excellent water-retaining property and good slow-release performance, can improve the soil moisture content, prolong the retention time of soil moisture, and slowly release inclusions while releasing the system moisture, thereby achieving the effect of improving the soil fertility and realizing the improvement of the water-retaining and fertilizer-retaining capabilities of the soil. Meanwhile, the soil conditioner prepared by the invention can also improve the drought stress resistance of crops.

The invention relates to the technical field of battery diaphragms, in particular to a porous polymer microsphere and a preparation method and application thereof.The porous polymer microsphere is internally provided with a porous structure and comprises secondary particles and a coating layer coating the surfaces of the secondary particles, and the secondary particles are of a porous grid structure formed by polymerizing primary particles; the primary particles comprise a polyvinylidene fluoride polymer, and the coating layer comprises a polyacrylic acid polymer. The secondary particles have abundant pores, so that the liquid absorption and retention performance of the diaphragm can be improved, and meanwhile, the diaphragm has a relatively high compression ratio and is beneficial to improving the energy density of the battery. Compared with the polyacrylic acid polymer, the polyvinylidene fluoride polymer has higher crystallinity, and the polyacrylic acid polymer coats the surface of the secondary particle composed of the polyvinylidene fluoride polymer, so that the overall crystallinity of the porous polymer microsphere can be improved, and the adhesive property of the porous polymer microsphere is improved; and the bonding effect between the diaphragm and the pole piece can be improved.

The invention discloses a carbon network interface optimized sodium ion battery positive electrode material, which is characterized in that ferric sodium pyrophosphate is used as a base material of the positive electrode material, and a carbon nanotube is filled between the base materials; the surface of the ferric sodium pyrophosphate base material is coated with an amorphous carbon layer, and the carbon content of the sodium ion battery positive electrode material is 1%-10%; and the specific surface area of the sodium ion battery positive electrode material is 20-25m < 2 > / g. According to the invention, oleic acid and the like are used as main carbon sources, carbon nanotubes are introduced to be inserted among positive electrode material particles, a sol-gel method is adopted to synthesize a precursor, and a finely controlled sintering process is adopted, so that the sodium ion battery positive electrode material with large specific surface area, rich pores and uniform carbon coating is successfully prepared, and the sodium ion battery positive electrode material shows relatively large capacity. The material shows excellent conductivity and structural stability. Compared with the existing positive electrode material, the material provided by the invention has higher ionic conductivity, has the advantages of safety, environmental protection and low cost, is suitable for the technical field of electrochemical energy storage batteries, and has a wide application prospect.

The present invention provides a kind of lignite for honeycomb activated carbon and its quality improvement and modification method, honeycomb activated carbon, the quality improvement and modification method of lignite for honeycomb activated carbon, comprising the following steps: taking lignite powder, adding an aqueous solution of sodium borohydride, mixing evenly, performing a reduction reaction, and obtaining reduced lignite; mixing the reduced lignite with a thermal stability regulator, 9,10-dihydrophenanthrene, and N,N-dimethylformamide evenly, performing a swelling treatment, and obtaining swollen lignite; mixing the swollen lignite with aniline evenly, stirring the reaction, and obtaining lignite for honeycomb activated carbon. The lignite obtained by the quality improvement and modification method of the present invention for honeycomb activated carbon is not easy to return to white, is not easy to crack after being made into honeycomb activated carbon, has good mechanical strength, and has good thermal stability.

The application discloses a preparation method of polyurea porous material with flower cluster structure and application thereof. The material prepared by the application is a flower cluster porous polyurea material prepared by a self-assembly reaction in a mixed solvent of acetone and water, with hexamethylene diisocyanate as a reaction monomer. Nucleophilic addition reaction occurs between isocyanate groups and water molecules to generate a urethane intermediate, the intermediate rapidly decomposes to release CO2 gas and generate an amine group; the newly generated amine group immediately reacts with the remaining isocyanate groups in the system to form a polyurea oligomer, and then self-assembles into a flower cluster porous structure. The polyurea flower cluster structure has a high specific surface area, rich pores and controllable surface chemical properties, is an ideal material as an adsorbent, and can effectively capture dye molecules in a solution. The application solves the key technical problems of low adsorption capacity and poor selectivity of traditional adsorption materials in dye wastewater treatment.

The invention discloses a biomass-based activated carbon material, and relates to the technical field of activated carbon material preparation, and the biomass-based activated carbon material comprises the following components by weight: 1 part of peony seed meal; 1-2 parts of cedar bark; the preparation method of the biomass-based activated carbon material specifically comprises the following steps: S1, drying, crushing and mixing peony seed meal and cedar bark to obtain a mixed raw material A; s2, putting the mixed raw material A into an evaporator, and performing low-temperature evaporation to obtain a mixed raw material A with high sulfate content; s3, performing ultrasonic impregnation and drying on the mixed raw material A with high sulfate content; carbonizing and activating to obtain a mixed carbon material B; s4, mixing the mixed carbon material B with sodium amide, and activating while isolating air to obtain a biomass-based activated carbon material; the problem of unstable quality of the biomass-based activated carbon material caused by unstable quality of the desulfurization waste liquid in the prior art is solved, the biomass-based activated carbon material with stable quality is prepared, the pore structure of the biomass-based activated carbon material is further optimized, and the adsorption performance is improved.

The invention relates to the field of spinning. The preparation method of the double-layer gauze bedding fabric comprises the following steps: step 1, yarn preparation: a first kind of yarn is high-strength all-cotton yarn, and a second kind of yarn is vinylon filament yarn or doubled yarn of the high-strength all-cotton yarn and the vinylon filament yarn; step 2, fabric weaving: the warp yarns of the surface layer and the inner layer are first yarns, and the weft yarns of the surface layer and the inner layer are woven by the first yarns and the second yarns at intervals; 3, fabric dyeing and finishing, wherein the fabric dyeing and finishing procedure comprises pretreatment, vinylon dissolution, dyeing, shaping finishing and preshrinking. The prepared fabric keeps the good air permeability of the double-layer gauze, and meanwhile, the strength, the hand feeling and the fuzzing and pilling performance of the fabric can be considered.

This invention belongs to the field of photocatalyst materials technology, specifically relating to a three-dimensional graphene aerogel photo-self-propelled Fenton catalyst, its preparation method, and its application. The preparation method includes: mixing a graphene dispersion containing ethylenediamine with a phenolic resin prepolymer containing ferrocene, phenols, and an alkaline catalyst; followed by a one-step hydrothermal reaction, washing, and freeze-drying to obtain the three-dimensional graphene aerogel photo-self-propelled Fenton catalyst. This catalyst can be used to degrade organic pollutants in water under visible light irradiation.

The utility model discloses a bioretention medium soil preparation system which comprises a gravity concentration device, a sludge plunger pump, a sludge conditioning device, a centrifugal dewatering system, a buffer storage bin, a belt type drying machine, a belt conveying system, a dry material bin and a sludge pelletizer, and an outlet of the gravity concentration device is communicated with an inlet of the sludge conditioning device through the sludge plunger pump. An outlet of the sludge conditioning device is communicated with an inlet of the centrifugal dewatering system, a sludge outlet of the centrifugal dewatering system is communicated with an inlet of the buffer stock bin, an outlet of the buffer stock bin is communicated with an inlet of the belt type drying machine, an outlet of the belt type drying machine is communicated with an inlet of the dry stock bin, and an outlet of the dry stock bin is connected with the sludge granulator. The bioretention medium soil preparation system disclosed by the utility model can effectively remove impurities in sludge water, and bioretention medium soil prepared by the system changes the physical and chemical properties of residual sludge and meets the requirements of resource utilization and deep dehydration; structural arrangement is reasonable, and production cost is low.

The invention belongs to the field of functional composite material preparation, and particularly relates to a method for preparing an expanded graphite / silver composite material through microwave expansion, and the method comprises the following steps: soaking graphite in an acid solution for oxidation treatment and heating, and then cleaning the graphite with deionized water until the solution is neutral to obtain graphite subjected to acid treatment; the preparation method comprises the following steps: mixing graphite subjected to acid treatment with an AgNO3 solution, uniformly stirring, then carrying out ultrasonic treatment, enabling the graphite to be uniformly infiltrated by the AgNO3 solution, carrying out freeze drying treatment on the mixture, baking the treated material under an infrared lamp, carrying out microwave expansion treatment on the baked mixture, cooling a product subjected to microwave expansion treatment, and carrying out tubular furnace pyrolysis, thereby obtaining the AgNO3 / AgNO3 composite material. And cooling to obtain the expanded graphite / silver composite material. The product obtained by the method disclosed by the invention has relatively high specific surface area and excellent conductivity.

The invention discloses an application of a CuO-CeO2 / ZrO2 supported catalyst in preparation of organic carbonate through ester exchange. The organic carbonate is one of dimethyl carbonate, diethyl carbonate, diisopropyl carbonate and di-n-amyl carbonate. The specific application process is as follows: alcohol and ethylene carbonate are used as raw materials, and under the action of the CuO-CeO2 / ZrO2 supported catalyst, ester exchange reaction is performed at 90-180 DEG C to prepare organic carbonate; the alcohol is one of methanol, ethanol, isopropanol and n-amyl alcohol; the molar ratio of the alcohols to the ethylene carbonate is (6-11): 1. When the CuO-CeO2 / ZrO2 supported catalyst is applied to preparation of organic carbonic ester through ester exchange, excellent catalytic activity and stability can be shown, and higher DMC selectivity and DMC yield can be achieved.

The application relates to the technical field of catalyst materials, in particular to a preparation method and application of a catalyst for synthesizing dimethyl carbonate from carbon dioxide and methanol; the method comprises the following steps: A, poloxamer is configured into a solution, HAc, NaClO4 and 1,3,5-trimethylbenzene are added into the solution and uniformly mixed to obtain a mixture; B, (NH4)2Ce(NO3)6 and H2BDC are added into the mixed solution in step A, the obtained solid after reaction is centrifugally separated, washed, soaked and dried to obtain a primary product, and finally the catalyst is obtained through calcination; in the application, HF-UiO-66 is synthesized by taking F127 as a template agent and taking 1,3,5-trimethylbenzene (TMB) as an expanding agent; the derivative HF-CeO2 catalyst with different TMB adding amounts is prepared through calcination; the adding of the expanding agent greatly increases the specific surface area of the catalyst, the CeO2 crystal grains generated through calcination are small, the number of acid-base sites is greatly increased, and therefore the catalyst has the largest catalytic activity, and the DMC yield reaches 12.02 mmol DMC / g cat .

This invention discloses an aminoindole derivative-based porous polymer, its preparation method, and its application, belonging to the field of dye adsorbent technology. The preparation method is as follows: 2-phenylindole is dissolved in acetic acid, and sodium nitrite aqueous solution is added dropwise. The system is then stirred and reacted at low temperature. After the reaction, the precipitate is collected and dried to obtain product 1. Product 1 is dissolved in ethanol, and NaOH solution is slowly added dropwise while stirring and mixing. Na2S2O4 is added, and the reaction is stirred under heating conditions. After the reaction, the precipitate is collected and dried to obtain product 2. Product 2, 1,2-dichloroethane, and dimethoxymethane are stirred and mixed. A catalyst is added, and the reaction is stirred and reacted under heating conditions. After the reaction, the precipitate is collected, washed, and dried to obtain the final product. The aminoindole derivative-based porous polymer of this application has high specific surface area, high adsorption rate, and high adsorption capacity, effectively solving the problems existing in the prior art.

The application relates to a method for rapidly preparing a porous Cu / Zn heterojunction electrocatalytic material and application. The method utilizes a dynamic hydrogen bubble template method to prepare the heterojunction electrocatalytic material, and the preparation is carried out under the condition of a higher cathode deposition current. The specific steps are as follows: firstly, copper sulfate, zinc sulfate and ammonium sulfate are dissolved in deionized water according to a certain ratio to serve as an electrodeposition solution. The electrodeposition is carried out at room temperature, the deposition condition is controlled by using a direct current power supply, a hydrophilic carbon paper is used as a substrate electrode, and the porous Cu / Zn heterojunction material is deposited for 30 seconds under the condition of a deposition current of-1.0 A. The preparation scheme can realize in-situ rapid preparation of the porous material, the loading is uniform and stable, the operation process of a relatively cumbersome hard template method is avoided, and the electrocatalytic carbon dioxide reduction preparation carbon monoxide performance is very high.

The application belongs to the technical field of MOF membrane and specifically relates to a Cu-BTC / cellulose composite-based MOF membrane and a preparation method thereof. After Cu-BTC / cellulose composite material is prepared by coating microcrystalline cellulose with Cu-BTC, the Cu-BTC / cellulose composite material is mixed with a membrane preparation mother liquor, a pore preparation agent and a homogeneous membrane material to form a homogeneous casting solution, and then the Cu-BTC / cellulose composite-based MOF membrane is prepared after coating, winding, solidification and drying. The Cu-BTC / cellulose composite material prepared by the application has a sub-micron rough surface and an elongated fibrous structure, and the MOF membrane prepared therefrom has more abundant pore and channel structures, which is beneficial to increasing the accessibility of active sites and greatly improving the gas permeability and gas separation performance of the membrane.

The invention discloses a preparation method of a heavy metal contaminated soil stabilizing agent, the heavy metal contaminated soil stabilizing agent and application of the heavy metal contaminated soil stabilizing agent, and relates to the technical field of solid waste treatment.The preparation method of the heavy metal contaminated soil stabilizing agent comprises the following steps that cereal straw is subjected to alkaline modification, and modified cereal straw is obtained; mixing the modified cereal straw with ardealite, and performing heat treatment to obtain a first mixture; the first mixture and blast furnace slag powder are mixed and smashed, and a second mixture is obtained; and mixing the second mixture with industrial alkaline residues to obtain the heavy metal polluted soil stabilizing agent. The raw materials used in the invention are all solid waste materials and are green and environment-friendly, and the prepared heavy metal polluted soil stabilizing agent can adsorb and complex heavy metals in the heavy metal polluted soil through hydration products formed by hydration of the agent, so that the heavy metals are fixed, and the migration of pollutants is effectively inhibited.

The present invention discloses a highly sensitive formaldehyde gas-sensitive material and a preparation method and application thereof, and relates to the technical field of formaldehyde gas detection. The present invention adopts an electrostatic spinning method to prepare Xwt% Au-La y Sm 1‑y FeO 3 As a formaldehyde gas-sensitive material, it has a hollow tubular nanostructure, a large specific surface area, and many pores, which are conducive to the transmission and diffusion of gas. By modifying lanthanum ferrite with Au, the responsiveness, selectivity and shorter response-recovery time of the prepared formaldehyde gas-sensitive material can be improved. By doping with Sm, the lattice shape inside the material can be changed, thereby improving the electrochemical properties of the gas-sensitive material. The present invention modifies lanthanum ferrite by doping with Au and Sm, so that the formaldehyde gas-sensitive material has a high sensitivity in detecting 0.1ppm formaldehyde gas.

The invention provides an acellular matrix fiber woven scaffold as well as a preparation method and application thereof, and belongs to the technical field of biomedical materials. The acellular matrix fiber woven scaffold comprises a woven structure unit, wherein the woven structure unit comprises warp yarns and a plurality of acellular matrix fiber weft yarns; the acellular matrix fiber is prepared by cutting an acellular matrix paper-based material at equal intervals; the plurality of acellular matrix fiber wefts are arranged in parallel according to a bionic trend and are interwoven and fixed through the warps, so that a bionic pattern simulating natural tissue fiber arrangement is formed in the weaving structure unit. The acellular matrix fiber scaffold is prepared by innovatively applying a weaving technology, the scaffold can improve the cell loading efficiency, is beneficial to self-repair and reconstruction of damaged tissues, provides suitable survival and growth conditions for cells, and has good application prospects in the field of biomedical engineering, especially in the aspects of tissue repair and regenerative medicine. And huge application potential is shown.

The invention discloses a polycrystalline iron-loaded porous charcoal aerogel catalyst as well as a preparation method and application thereof, and relates to the field of carbon catalyst preparation. The polycrystalline iron loaded porous biochar aerogel catalyst comprises a porous biochar matrix, polycrystalline iron nanoparticles are loaded on a biochar sheet layer through Fe-C bonds, and the whole internal structure of the porous biochar aerogel is of a honeycomb-shaped pore network structure; according to the preparation method of the catalyst disclosed by the invention, the iron-based material and the carbon-based material are cross-linked together by utilizing ion exchange of a cross-linking agent, and the catalyst is prepared through freeze drying and high-temperature calcination treatment. The aerogel provided by the invention has a rich pore structure, can adsorb and catalyze ozone molecules to generate active atomic oxygen, and has stable and efficient catalytic activity when treating new micropollutants in tail water, and meanwhile, polycrystalline iron nanoparticles are stably loaded on the surface of the porous biochar through Fe-C bonds, so that the photocatalytic activity of the porous biochar is improved. The mechanical strength and the structural stability of the catalyst can be effectively improved.

The invention discloses a method for preparing a hard carbon negative electrode material rich in micro-sodium pore structures by using a biological fermentation method and application, and relates to the technical field of sodium ion battery negative electrode materials. The microbial flora is added into the viscous pasty material, hyphae generated by fermentation of the microbial flora can effectively enter structural gaps of hard carbon, rich and uniform pores can be reserved after calcination, and it can be ensured that the hard carbon material rapidly achieves efficient transmission of ions and electrons. In addition, a double-layer carbon-coated hard carbon material formed by a calcination coating process is coated with pore inner-layer carbon and hard carbon outer-layer carbon. Wherein the porous carbon coating structure can ensure that the hard carbon material can quickly and efficiently realize high-efficiency transmission of ions and electrons, and the conductivity and the cycling stability of the material are greatly improved; the outer carbon-coated structure can improve the overall conductivity of the material, protect the structural integrity of the material, and prevent structural damage caused by volume expansion or shrinkage, thereby improving the cycling stability of the material.

The present invention discloses a method for preparing a light matrix fertilizer for cultivating indocalamus container seedlings. The matrix fertilizer raw materials are calculated by weight and include: 10-15 parts of peat soil, 10-15 parts of forest surface soil, 40-50 parts of fermented bamboo residues, 10-20 parts of mushroom stick waste, 5-10 parts of manure, 5-10 parts of coal slag powder, 10-15 parts of expanded perlite particles, and 5-10 parts of cross-linked microcrystalline cellulose super absorbent resin. The light matrix fertilizer raw materials of the present invention are simple to prepare and low in cost. The indocalamus ramet container seedlings cultivated by using the matrix have high survival rate and new bamboo germination rate, strong new whip germination ability, and vigorous plant growth. At the same time, the seedling culture matrix has the characteristics of loose texture, light weight, good water retention and excellent anti-collapse performance, which is convenient for seedling transportation and mountain planting.

The invention relates to the technical field of battery materials, in particular to rich-pore iron phosphate, lithium iron phosphate and a preparation method thereof.The preparation method of the rich-pore iron phosphate comprises the following steps that 1, a phosphorus source, an oxidizing agent and an iron source are mixed for a reaction, and slurry a is obtained; (2) filtering and separating the slurry a to obtain a filter cake b; (3) pulping the filter cake b, adding phosphoric acid to enable the molar ratio of Fe to P in the slurry to be 0.96-0.99, adjusting the pH value of the system to be 1.0-1.5, and crystallizing to obtain slurry c; and (4) filtering the slurry c, washing the slurry, drying, and calcining to obtain the product. By controlling the process conditions of the iron phosphate, the iron phosphate with abundant pores and high specific surface area is obtained, and the lithium iron phosphate positive electrode material with excellent and stable low-temperature performance is prepared by taking the pore-rich iron phosphate as a raw material through a carbon thermal reduction method.

The present invention discloses a porous electrocatalytic anode material and a preparation method and application thereof, belonging to the technical field of wastewater treatment, and comprising the following steps: applying a coating liquid on a titanium metal substrate treated with inorganic acid immersion by multiple coatings, and performing a programmed temperature rise treatment under an inert atmosphere after each coating to obtain the porous electrocatalytic anode material; the coating liquid contains transition metal ions, polycarboxylic acids and polyhydroxy organic porous materials; the transition metal ions include first transition metal ions and second transition metal ions, the first transition metal ions include one or more of iron, cobalt, nickel, copper or zinc ions, and the second transition metal ions include ruthenium and iridium ions. The electrocatalytic anode material prepared by the method has strong acid and alkali corrosion resistance, large catalytic contact area, abundant catalyst exposure sites, high conductivity, and high electrocatalytic oxidation efficiency.

The application discloses a preparation method of light water treatment granular material, and belongs to the field of water pollution purification material. The light water treatment granular material is prepared through preparation of titanium-zinc-calcium sol and granular shaping process, and the granular material has the characteristics of low density, rich porosity and stable structure, and is suitable for purifying and treating organic contaminated wastewater. Meanwhile, the granular material has a large adsorption capacity for organic pollutants in wastewater, and can spontaneously decompose the adsorbed organic pollutants, so that the granular material can not only quickly remove the organic pollutants from the wastewater, but also has a self-purification capacity, and is suitable for long-term stable and large-scale wastewater treatment process.

The present invention relates to the technical field of water purification, and discloses a circulating purification treatment device for flowing water, including a mounting base, a drainage pipe is fixedly mounted on the upper side of the mounting base, the tail of the drainage pipe is fixed to the mounting base and is in a blocked state, a first discharge pipe, a second discharge pipe and a filtrate pipe are respectively fixedly mounted on the tail end of the mounting base, a drainage port is provided on the inner wall of the drainage pipe, and the drainage pipe is connected to the first discharge pipe through the drainage port. By arranging a rotatable filter disc in the drainage pipe, since a vortex-shaped baffle is arranged at the end of the filter disc, when the vortex-shaped baffle rotates and is pushed by the water flow in the drainage pipe, the impurities intercepted by the filter disc can be pushed from the intermittently conducted overflow window to the central pipe to discharge the impurities, so that the filter disc has an automatic cleaning function, can circulate and filter sewage, achieve the effect of not being easy to be blocked, reduce maintenance costs, and be more economical and reliable to use.

The invention relates to metal ink suitable for surface conductive functionalization of a water treatment ceramic membrane and a preparation method of the metal ink. The metal ink is prepared from soluble organic copper salt, organic amine, inorganic ammonium salt, graphene oxide, polyimide ultrafine powder, ethanol and water. The printing ink has the advantages that soluble organic copper salt and organic amine act to generate organic complex copper, the copper element content in the printing ink can be increased in cooperation with the dispersion effect of graphene oxide, inorganic ammonium salt is decomposed to generate gas in the initial stage of printing ink film forming, heating and curing, on one hand, pores are rich after film forming, and the ventilation and water filtering capacity is reserved; on the other hand, ammonia gas released in an air isolation environment and ammonia gas generated by decomposition of organic complex copper can reduce copper ions and graphene oxide together to form a copper and graphene double-component conductive layer, so that excellent conductivity is ensured; a proper amount of polyimide ultrafine powder enables copper and graphene to be mutually combined and firmly attached to the surface of the ceramic membrane to form a conductive layer with excellent performance.

The invention provides a preparation method of a europium porcelain sand filter material with a purification function, and belongs to the field of water pollution purification materials, and the method mainly comprises the following preparation steps: preparing europium modified porcelain sand, then preparing a titanium precursor, and finally carrying out hydrothermal membrane preparation. Through the step of modifying the porcelain sand with europium, part of metal elements on the surface of the porcelain sand are replaced by europium ions, and then through the step of hydrothermal film preparation, a titanium precursor reacts with the europium-modified porcelain sand to generate the europium titanate coating. The europium porcelain sand filter material disclosed by the invention has the characteristics of rich pores, strong filtering capacity, water flow impact resistance and the like; meanwhile, organic pollutants attached to the surface can be rapidly decomposed under illumination, and the performance of continuously treating the organic pollutants in wastewater is achieved.

The invention belongs to the technical field of water purification materials, and particularly relates to a gelatin coated TiO2-polypyrrole composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: adding the polysorbate-80 into the paraffin oil, and stirring at 30-60 DEG C for 20-50 minutes to obtain an oil phase; heating water to 40-60 DEG C, then adding gelatin and the TiO2-polypyrrole composite precursor material, and stirring for 20-50 minutes to obtain a water phase; adding the water phase into the oil phase, and stirring for 30-60 minutes to obtain a mixed solution; and cooling the obtained mixed solution to 2-10 DEG C, then adding ethanol, stirring for 15-40 minutes, then sequentially washing with acetone and isopropanol, and freeze-drying the obtained solid matter, thereby obtaining the product. The polypyrrole and the gelatin contain functional groups such as amino groups, carboxyl groups and the like, and can form a complex with lead ions, so that the adsorption activity of the nano TiO2 material can be effectively improved, and the lead removal performance of the material is improved. The composite material disclosed by the invention shows very good removal rate and adsorption efficiency on lead ions in water.

The present invention discloses a method for preparing porous lithium titanate ceramic spheres based on nanowire construction, which is specifically implemented according to the following steps: step 1, preparing α-lithium titanate nanowires by a hydrothermal method; step 2, preparing lithium ceramic microsphere green body; step 3, preparing porous structure β-lithium titanate ceramic spheres. The present invention utilizes the characteristics of lithium titanate nanowires to construct a porous structure, controls the porosity and pore size by controlling the sintering process, and avoids the use of organic pore formers or other additives; at the same time, the structure of the nanowires overlapping each other can also ensure that the ceramics still maintain good compressive strength at high porosity.

The invention provides a catalyst for activating persulfate as well as a preparation method and application of the catalyst, and belongs to the technical field of catalytic materials and the technical field of water treatment. The preparation method comprises the step of calcining a mixture of graphite-like carbon nitride and coal to obtain the catalyst for activating persulfate. According to the catalyst for activating the persulfate, graphite-like carbon nitride serves as a nitrogen source, coal serves as a carbon source, the catalyst for activating the persulfate is prepared through a simple calcination method, the problem of catalytic inertia of the coal is solved, the yield is high, further purification is not needed, the catalyst can be directly used, the preparation process is simple and convenient, reaction conditions are universal, and the catalyst has high application value; the industrial production is convenient.