148results about How to "Improve adsorption speed" patented technology

The invention discloses a preparation method of a high-performance lithium adsorbent. The method comprises the following steps of: (1) adding 100-500 ml of deionized water to a three-neck flask of 1L and adjusting a pH value to be 3-7; (2) adding 25-150g of organic aluminum to the flask at 40-70 DEG C and hydrolyzing to obtain active aluminum hydroxide, gradually dipping a lithium salt solution or a lithium salt solid three times of the organic aluminum 0.5h after hydrolyzation and reacting for 1-2h to obtain an active substance product of LiCl.2Al(OH)3.xH2O; (3) filtering the active substance containing the aluminum hydroxide and washing with 95 percent of ethanol twice to obtain solid precipitate and filtrate; and (4) drying the solid precipitate at 30-70 DEG C. The prepared active substance of aluminum hydroxide radically solves the problem of uneven reaction of a traditional method for preparing the active substance of aluminum hydroxide by utilizing solid-phase mixing, and the invention has the advantages of high absorption speed, greater specific surface area and longer adsorbent service life.

The invention discloses a preparation method for a novel nano magnetic cyclodextrin / graphene biological adsorption material and particularly relates to modifying the surface of graphene with magnetic cyclodextrin through a surface modification technology. The novel method is characterized in that a nano magnetic particle is adopted as a carrier; coating modification is conduced on the nano magnetic particle to obtain the magnetic cyclodextrin with a core-shell structure; and then the functional graphene is modified with the magnetic cyclodextrin to prepare the novel magnetic nano biological adsorption material with super-strong adsorbability, easiness in separation and zero contamination. Through the adoption of the preparation method, the defect of high possibility of agglomeration of the graphene is overcome, the specific surface area of the adsorption material is greatly enlarged, the enveloping sites of cyclodextrin molecules are increased, and the range of adsorption objects is expanded. The adsorption material prepared by the invention has the advantages of strong controllability of a surface structure, reliable mechanical stability, strong recognition capability, high adsorptive capacity, easiness in desorption, reusability and the like; and simple and feasible ways and means are provided for treatment of environmental pollutants and recycling of waste.

This invention is to provide a sheet product that is excellent in moisture absorption amount, moisture absorption speed and moisture release speed and is capable of keeping a powder from falling off and that can have a large content of a moisture adsorbent, and the sheet product of this invention contains (a) a moisture adsorbent formed of a tubular or fibrous metal oxide, (b) a cellulosic fibrillated fiber, and (c) an organic fiber having a fineness of 0.01 dtex to 0.45 dtex and is characteristically produced by a paper-making method.

The invention discloses a preparation method of undecylene amido propyl betaine modified diatomite. The method is characterized in that after diatomite is treated with 2 mol / L HCL, pretreated diatomite is obtained; the pretreated diatomite is subjected to organic modification by using absolute ethyl alcohol and (3-chloropropyl)trimethoxysilane; then 45%-55% of deionized water and 8%-18% of undecylene amido propyl betaine are added to a reactor in percentage by mass, the mixture is stirred for dissolution, then 28%-38% of organic diatomite is added, the mixture is evenly mixed, 5%-8% of hydrogen peroxide with the mass percentage concentration of 30% is added, the sum of percentages of all components is 100%, the mixture is stirred at the constant temperature of 65 plus / minus 2 DEG C for a reflux reaction for 4-6 h, solid-liquid separation is performed after cooling, separated solids are washed with deionized water until the filtrate is neutral, filtration and drying are performed, and the undecylene amido propyl betaine modified diatomite is obtained. The adsorbent has very high adsorption capacity for oil, has excellent physical and mechanical properties and high regeneration capacity, and capable of being reused, low in cost and environment-friendly.

The invention discloses a hyperbranched polymer modified magnetic straw adsorbing material and a preparation method thereof. The method comprises the following steps: sequentially modifying straws with a silane coupling agent and a hyperbranched polymer, and compounding the modified straws with an iron salt to prepare the hyperbranched polymer modified magnetic straw adsorbing material. A raw material used in the invention is agricultural waste plant straws, and the raw material has the advantages of wide sources, low price, non-toxicity, and no secondary pollution to water. The hyperbranched polymer modified magnetic straw adsorbing material has the characteristics of large adsorption capacity, fast adsorption speed, and easiness in separation and recovery.

The invention discloses a few-layer boron nitride as well as a preparation method and application of the few-layer boron nitride. The preparation method of the few-layer boron nitride comprises the following steps: mixing carbamide with boric oxide, dissolving the carbamide and the boric oxide in an ethanol aqueous solution and removing the ethanol by heating and evaporating to obtain white powder; transferring the white powder into a porcelain boat, calcining in a tubular furnace by taking nitrogen as a protection gas, and thus obtaining a white solid which is the few-layer boron nitride. The invention also discloses an application of the few-layer boron nitride in absorption removal of antibiotics pollutants in water. The few-layer boron nitride shows high adsorption removal rate of antibiotics after adsorbing for 2-3 minutes at the temperature of 15-45 DEG C and the pH of 3-11, so that the adsorption property of the few-layer boron nitride is obviously better than that of commercial-grade boron nitride. In addition, the material is simple to prepare, low in cost and strong in operability. The application of the few-layer boron nitride in absorption removal of antibiotics pollutants in water has good economic and environmental effects.

The invention discloses a hollow SiO2 (silicon dioxide) microsphere with pores in graded distribution as well as a preparation method and an application thereof. The preparation method comprises the steps that: polrvinyl benzene microspheres, ethyl orthosilicate, ammonia water, ethanol, water and alkyl ammonium bromide are used as raw materials, a sol-gel method is adopted for preparing the hollow SiO2 microsphere, during the preparation, the polrvinyl benzene microspheres are used as a hollow template, the alkyl ammonium bromide is used as pore formers, two to three layers of SiO2 cases are covered on the polrvinyl benzene microspheres to form composite microspheres, the carbon numbers of the pore formers used during the covering of each layer of SiO2 cases are different, and the hollow SiO2 microsphere with pores in graded distribution is finally obtained through calcination. The use performance of the hollow SiO2 microsphere is optimized, the hollow SiO2 microsphere with different case layer thicknesses, specific surface area, pore volume and apertures, and the pores of the hollow SiO2 microsphere are distributed in a gradually increased way from outside to inside in the radialdirection of a case layer. The microsphere obtained by the method has the advantages that the adsorption speed is accelerated, the adsorption quantity is increased, and good application is realized in the aspects of aquatic dye molecule adsorption and food preservative load.

The invention belongs to the field of a battery system, in particular relates to a negative pressure humidification on-board fuel battery system with a perforated plate humidifier. The fuel battery system comprises an air compressor, a humidifier and a fuel battery galvanic pile. The fuel battery system is characterized in that the humidifier is the perforated plate humidifier, the air outlet of the perforated plate humidifier is connected with the air inlet of the air compressor, the air outlet of the air compressor is connected with the air inlet of the fuel battery galvanic pile, and the end gas outlet of the fuel battery galvanic pile is connected with the end gas inlet of the perforated plate humidifier. Compared with the prior art, the perforated plate humidifier provided by the invention effectively improves the humidification efficiency of the perforated plate humidifier, lowers the cost of the humidifier, reduces the volume of the humidifier, namely, reduces the volume of the humidifier of the fuel battery with 50 kW from 10L to 2L, promotes the stability of the humidifier and prolongs the service life of the humidifier. In addition, as the fuel battery system with the perforated plate humidifier improves the humidification efficiency and stability of the humidifier, the stability of the operation of the fuel battery is also promoted.

A moisture- or protein-adsorbability imparting agent, comprising a porous silica having a hexagonal pore structure, an average pore size of from 0.8 to 20 nm, an average particle size of 50 nm to 100 μm, a specific surface area of from 400 to 2000 m2 / g, and a pore volume of from 0.1 to 3.0 cm3 / g; a material having an adsorbability of moisture or a protein, comprising the moisture- or protein-adsorbability imparting agent; and use of the moisture- or protein-adsorbability imparting agent for imparting absorbability of moisture or a protein to a material selected from the group consisting of food wrapping materials; filtration aid agents; sanitary articles; compositions containing a synthetic resin; moisture-controlled material; covering materials for wounds; insulation substrates; coating materials for semiconductor devices; cosmetics; inkjet recording media; and compositions containing synthetic fibers.

The invention discloses an adsorbent capable absorbing a soil heavy metal. The adsorbent is characterized by being prepared by the following raw materials, by weight part: 8-15 of calcium carbonate fiber, 20-40 of tetrabutyl titanate, 3-5 of silica sol, 6-8 of calcium aluminate, 60-80 of volcanic rock, 6-9 of PA6 nylon powder, 3-4 of gelatin, 1-3 of ammonium bicarbonate, 6-7 of diatomite, 5-8 of shell powder, and a proper amount of deionized water. Shell powder and diatomite added in the adsorbent has excellent biological property, can improve soil quality, and is high in adsorption efficiency of heavy metal. The prepared adsorbent has excellent adsorption effect on various contaminants, is high in adsorption efficiency, easy to remove, and good in reuse effect, and can greatly improve the soil. The production process is simple, and the material source is wide, so that the adsorbent has great application prospects.

The invention discloses a full fraction crude benzene hydrogenation method and a catalyst, belonging to the technical field of all fraction crude benzene processing. The method comprises steps of firstly allowing crude benzene fraction over 70DEG C and hydrogen to pass through a corpuscule generator and a static mixer sequentially, so as to mix the two raw materials into uniform corpuscule raw material with diameter of 0.1-20mu m; fully saturating the corpuscule raw material through hydrogenation through the catalytic action of the low temperature hydrogenation catalyst under the conditions of certain pressure, air speed and temperature, so as to convert the corpuscule raw material into stable saturated compound; mixing the oil generated through low temperature hydrogenation with fresh hydrogen, circulating hydrogen and less than 70DEG C crude benzene fraction from a pre-fraction tower, then hydrogenating again, gas stripping and fraction distilling the oil generated by hydrogenating full fraction crude benzene so as to obtain light arene fraction and heavy arene product, then predistilling, extracting and rectifying so as to obtain pure benzene, methylbenzene, xylene and non-arene products. According to the method, the problem of coking of full fraction crude benzene raw material in high temperature hydrogenation is solved, and the crude benzene hydrogenation device can run for long period.

The invention discloses a preparation method of a modified lignin absorbent for absorbing TNT (Trinitrotoluene), which is characterized by comprising the steps of: adding 5-30 parts by weight of lignin into 150-500 parts by weight of 1,2-alkyl dihalide, adding 15-50 parts of catalysts, stirring for 3-10 hours at 50-90 DEG C, washing reacted materials by using a mixture of ice and diluted hydrochloric acid, filtering and washing by using water, and drying to prepare grafted halogenated lignin; and then adding 50-300 parts of aminating agents into 20-80 parts of organic solvents, adding 5-30 parts of the grafted halogenated lignin, stirring for 4-10 hours at 60-90 EG C, filtering, washing by using diluted ammonia water and water, and drying to obtain the modified lignin absorbent. The absorbent has higher selective absorption capacity on the TNT and other organic compounds containing nitryl and can be used for absorption and separation of the TNT and other organic compounds containing the nitryl in the explosive industrial wastewater so as to protect the environment.

The invention discloses a magnetic cyclodextrin-carbon nanofiber composite material and a preparation method thereof. Nano magnetic metal or a nano magnetic metallic oxide is taken as a carrier, cyclodextrin is firstly subjected to surface modification, magnetic cyclodextrin is obtained, the magnetic cyclodextrin is bonded to functional carbon nanofiber, and a novel nano magnetic biological adsorption material is obtained. By the aid of the preparation method, space orderliness of molecular arrangement is improved, the specific surface area of the polymer is greatly increased, the binding site of ions or molecules with cyclodextrin molecules is increased, and the internal mass transfer process is reduced. The prepared nano magnetic adsorption material has the advantages of controllability of a surface structure, good stability, high adsorbing capacity, fast adsorption balancing, high probability of separation, reusability and the like, can be used for directional recovery of precious metal and rare-earth metal as well as separation and enrichment of heavy metal in wastewater and has good application potential.

The invention provides a hazy air treatment device. The hazy air treatment device comprises an air treatment system, a water circulation system and an energy recovery system, wherein the air treatment system in a main box body comprises a first filter, a second filter, a first evaporator, a particle adsorption device, a first condenser and a fan; a closed ring formed by a circulation water pump on the outer side of the main box body, a second filter and a second condenser in a water tank is the water circulation system; a second evaporator is arranged at an indoor air return hole on the outer side of the main box body; a throttling device is arranged between the first evaporator and the first condenser; a closed ring formed by the second evaporator, a compressor, a second condenser, the first condenser, the throttling device and the first evaporator in sequence is the energy recovery system. The treatment device has the obvious advantage of energy recovery, and hazy air is effectively treated on the premise of energy conservation.

The invention discloses a preparation method and application of a magnetic hollow graphene-based composite microsphere material. The preparation method comprises the following steps: taking a polymer microsphere with positive charges as a template, and obtaining the magnetic hollow graphene-based composite microsphere material through a high-temperature heat treatment one-step method. The preparation method provided by the invention is simple and feasible and has no environment pollution, and industrial production is easy to realize; meanwhile, the prepared magnetic hollow graphene-based composite microsphere material has a relatively large specific surface area and a developed pore structure, and can be used for efficiently and rapidly adsorbing and separating dye molecules. The magnetic hollow graphene-based composite microsphere material prepared by the preparation method has a wide application prospect in the aspect of treating dye wastewater.

The invention relates to a three-dimensional graphene aerogel material for dye adsorption and a preparation method thereof. First, graphene oxide and 2-urea-4-[H]-pyrimidone molecules are dissolved in anhydrous N,N-dimethyl formamide, wherein dibutyltin dilaurate serves as a catalyst, and reaction is performed for a period of time to obtain 2-urea-4-[H]-pyrimidone modified graphene; the 2-urea-4-[H]-pyrimidone modified graphene is dissolved in the anhydrous N,N-dimethyl formamide, distilled water is added to enable the 2-urea-4-[H]-pyrimidone modified graphene to be self-assembled into a loose porous structure; the N,N-dimethyl formamide is removed by exchanging the solvents, and low-temperature freeze-drying is performed to obtain the three-dimensional graphene material. By the adoption of the technical scheme, the operation is simple and fast and is environmentally friendly, and the prepared aerogel material is high in porosity and large in specific surface area and is expected to be applied to the fields of dyes, heavy metal adsorption and the like.

The invention discloses a preparation method of a novel magnetic nano biosorption material based on magnetic chitosan, in particular to a method for modification of the magnetic chitosan on carbon nanofibers via a functionalized surface modification technology. The novel method is characterized in that nano magnetic metal or nano magnetic metal oxide is used as a carrier and is first subjected to surface modification to obtain the magnetic chitosan, and the magnetic chitosan is then bonded to the functionalized carbon nanofibers to obtain the novel magnetic nano biosorption material. By adopting the preparation method, the spatial ordering of molecular arrangement can be improved, the specific surface area of the polymer can be increased greatly, the number of binding sites of ions or molecules and chitosan molecules can be increased, and the internal mass transfer process can be shortened. The prepared nano magnetic adsorption material has the advantages of controllable surface structure, good stability, large adsorption capacity, rapid balancing of adsorption, easy separation and good reusability, is suitable for directed recovery of precious metals and rare earth metals and separation and enrichment of heavy metals in wastewater, and has good potential of application.

The invention discloses a device and method for deep removing water and carbon dioxide in nitrous oxide, and belongs to the technical field of chemical industry production. The device comprises a raw material bottle, a collecting bottle and adsorbing devices. The adsorbing devices include the 13X molecular sieve adsorbing device, the 5A molecular sieve adsorbing device, the modified molecular sieve adsorbing device and the 3A molecular sieve adsorbing device, wherein the 13X molecular sieve adsorbing device, the 5A molecular sieve adsorbing device, the modified molecular sieve adsorbing device and the 3A molecular sieve adsorbing device are sequentially connected. The raw material bottle is heated by a heating device on the outer side of the raw material bottle, a first pressure reducing device is opened when the pressure of raw gas in the raw material bottle reaches 2.0 MPa to 4.0 MPa, and the raw gas sequentially enters the molecular sieve adsorbing devices. When the pressure of the gas in the adsorbing devices reaches 2.0 MPa to 4.0 MPa, a second pressure reducing device is opened, and the gas with impurities removed through the adsorbing devices is collected into the collecting bottle, wherein a refrigerating device is arranged on the outer side of the collecting bottle. By means of the method, the adsorbing depth and the adsorbing speed of adsorbents are increased through high-pressure adsorption, the physical adsorbing function and the chemical reaction function are achieved by conducting chemical modification on molecular sieves, the adsorbing performance of the adsorbents is improved, the water impurity and the carbon dioxide impurity in the nitrous oxide are deep removed, and a high-purity nitrous oxide product is obtained.

The invention discloses a surface processing technique of biological medical macromolecular material, which comprises the following steps: placing cell culture container into plasma processor; introducing oxygen, nitrogen or other plasma gas under vacuum or negative pressure; discharging the plasma generator; forming plasma layer on the inner surface of cell culture container; improving biological compatibility of macromolecular material.

The invention discloses a preparation method of glucose crosslinked nano SiO2-chitosan composite aerogel and an application of the glucose crosslinked nano SiO2-chitosan composite aerogel to cigarettefilter tips. The preparation method comprises steps as follows: chitosan is dissolved in an acetic acid solution, glucose is added and taken as a cross-linking agent to support a three-dimensional skeleton of chitosan, then nano SiO2 powder is added, an NaHCO3 solution is dropwise added to regulate pH value, and after heating in water bath, hydrosol is obtained; the hydrosol is washed with deionized water and subjected to freeze drying, and the glucose crosslinked nano SiO2-chitosan composite aerogel material is obtained. The obtained glucose crosslinked nano SiO2-chitosan composite aerogel material is broken and screened, 20-40-mesh particles are prepared and applied to the cigarette filter tips, so that the release amount of harmful composition in smoke is reduced, and the material hasno negative influence on sensory quality of cigarettes.

A carbonizing method with variable-pressure control in whole procedure for high carbonizing quality features that above the carbonizing furnace, the high-flow kerosene drip method is used to increase the positive pressure in furnace for generating high-activity high-carbon atmosphere and high furnace pressure, which can speed up the carbonizing on the surface of workpiece, and the furnace pressure can be regulated for controlling the carbonized depth, hardness and metallographic structure of workpiece.

The invention provides a formaldehyde removal coating and a preparation method thereof, and relates to the field of formaldehyde treatment. The formaldehyde removal coating comprises the following components in parts by weight: 5-10 parts of an activated carbon loaded nano TiO2 material, 3-5 parts of chitosan, 3-5 parts of rosin resin, 0.1-1 part of nano graphene, 5-10 parts of lignin, 1-5 parts of a plant extract, 1-5 parts of light calcium, 0.2-2 parts of biological enzyme, 30-50 parts of silicone acrylic emulsion, 0.05-1 part of a coalescing agent, 0.05-1 part of a defoaming agent, 0.05-1 part of a dispersing agent and 20-40 parts of water, the biological enzyme comprises peroxidase, formaldehyde dehydrogenase and polyphenol oxidase, wherein the plant extract is an aloe extract, a Chinese ivy extract, an Agave americana extract and a dayflower extract. Through use of the formaldehyde removal coating, formaldehyde is removed in a manner of combining physical adsorption, chemical catalysis, the biological enzyme and the plant extracts, the removal effect is improved, and the formaldehyde removal coating is safe, non-toxic and harmless.

The invention discloses a preparing method for acid cation exchange fibers. The preparing method comprises the following steps that polypropylene fibers are added into a proper amount of organic alcohol, diethylenetriamine is added, a reflux reaction is carried out in a stirring state, a product is washed with water and aired, and pretreated polypropylene fibers are obtained; the pretreated polypropylene fibers are soaked in an aqueous solution system including ammonium ferrous sulfate and acrylamide, nitrogen is introduced for 15 min, and a grafting reaction is carried out in a water bath at 80 DEG C; acrylamide monomers are removed after the reaction is finished, a product is washed with water and acid in sequence, and finally washed with water to be neutral, the product is dried to reach a constant weight, and alkalescence ion exchange fibers are obtained. Polypropylene fibers are selected to carry out irradiation modification on the alkalescence ion exchange fibers, and acid gas such as SO2, HCl, Cl2 and HF and anion organic pollutants in a water phase can be effectively adsorbed; besides, the adsorption speed is high, and the adsorption capacity is large.

The invention relates to a preparation method for a metallocene-containing porous polymer material. The method comprises the main steps that with a metallocene compound or a mixture of the metallocenecompound and an aromatic compound as a raw material, under the function of a Lewis acid catalyst, the metallocene-containing porous polymer is prepared through a Friedel-Crafts reaction. The preparedmetallocene-containing porous polymer material is adjustable in pore size, pore volume and specific surface area, an obtained porous network is formed by connecting covalent bonds, and the material has good chemical stability and thermal stability. By introducing metal and heteroatoms to the porous polymer network, the interaction force of a polymer framework and adsorbed molecules can be increased, and the adsorption amount and speed of carbon dioxide, methane, hydrogen, sulfur dioxide, dyes and the like are increased.

The invention relates to the technical field of remediation of oil-overflowing water bodies and particularly relates to a microorganism loading type resin adsorbent capable of degrading greasy dirt and a preparation method of the resin adsorbent. The resin adsorbent is prepared by the steps of dipping a microorganism loading body into an acrylate copolymer emulsion, and drying, wherein the microorganism loading body is prepared by loading a multi-channel carrier particle with petroleum hydrocarbon degrading bacteria, and the carrier particle is a konjac glucomannan aerogel particle. The resinadsorbent is capable of degrading adsorbed petroleum and continuously treating petroleum in water; konjac glucomannan aerogel is loaded with petroleum hydrocarbon degrading bacteria and is embedded into acrylate resin, so that the curing stability of a strain is high; and konjac glucomannan aerogel and acrylate resin are internally provided with rich micro-fine channels, so that the resin adsorbent has huge oil absorption capacity and is high in adsorption velocity.

A hydrogen storage device capable of storing hydrogen for a long period of time is provided. The hydrogen storage device of the invention is provided with a thermally insulated container having an inner space, a liquid hydrogen inflow opening, and a hydrogen gas outflow opening, and a hydrogen adsorbing member filled in the inner space.

The invention provides a catalytic purification composite material and a preparation method and application thereof. Activated carbon loaded manganese sand particles are used as a basic framework of the material, and mixed metal oxides as active components are loaded on the outermost layer of the framework. The preparation method of the material comprises the following steps: pretreating manganese sand and removing impurities on the surface of the manganese sand; taking wooden activated carbon or shell activated carbon as an activated carbon precursor; roasting in an inert atmosphere; preparing a porous carbon structure which uses the manganese sand as a framework; and modifying the surface of the manganese sand-porous carbon structure by using the metal oxides to form the novel composite purification material with adsorption and electro-catalyst composite functions. When the catalytic purification composite material is used, the composite material effectively adsorbs and catches low-concentration organic matters in micro-polluted raw water at first, so that pollutants are adsorbed on the surface of the material, then the composite material with adsorption saturation is guided into an electrolytic bath for electrochemical oxidation, the pollutants on the surface of the composite material are desorbed and decomposed, and are thoroughly mineralized into carbon dioxide and water, and meanwhile, recycling of the composite material is realized.

The invention provides a production method of a colored tape with the long printing service life. The method comprises the following steps that a, colored tape grey cloth is manufactured by selecting nylon 66 yarns with high breaking strength; b, preshrinking and washing treatment of a new process are carried out on the colored tape grey cloth; c, the washed colored tape grey cloth is soaked in ink adsorption accelerant solution pool and is extruded by a compression roller to sufficiently adsorb accelerant solutions; d, the colored tape grey cloth is dried and shaped through the standard of the new process; e, a professional fusion cutting machine is used for carrying out fusion cutting on the colored tape grey cloth, and a colored backing tape is formed; f, a professional ink coating machine is used for coating the colored backing tape with ink. After the six production procedures are carried out, the ink adsorption speed and volume of the colored backing tape are increased, the ink adsorption volume of the colored backing tape is increased by 10-15%, printing characters of the colored tape are improved to be 260-280 thousands per meter from 200 thousands per meter, and the service life of the whole printing colored tape is prolonged.

The invention discloses a preparation method of a catalyst for synthesizing diphenyl carbonate through transesterification. The method comprises the following steps: uniformly mixing a catalyst active component and a supporter by using nitric acid, shaping the mixture, drying the mixture at 20-40 DEG C for 1-15 hours, drying the mixture at 40-150 DEG C for 1-24 hours, and finally roasting the mixture at 300-900 DEG C for 1-20 hours to obtain a solid acid-base bifunctional center catalyst for synthesizing diphenyl carbonate through transesterification. The catalyst is an acid-base bifunctional catalyst and has an acid center and an alkaline center. The preparation method is extrusion molding. The formed catalyst is in the shape of bar-shaped columns, so that the problems that the homogeneous catalyst is not easy to separate and the active components of the heterogeneous catalyst are lost are solved. The catalyst prepared by the method has high activity and selectivity for transesterification of dimethyl carbonate and phenol, the phenol conversion rate can reach 50% or above, the product selectivity is greater than 99%, and the diphenyl carbonate purity is greater than 99.5%. The method is simple to operate, economic and environment-friendly, easily available in materials and easy to industrialize.

The invention discloses a modified volcanic rock adsorbent for processing waste water. The adsorbent is characterized by being prepared from the following raw materials, by weight part: 8-15 calcium carbonate fiber, 20-40 of tetrabutyl titanate, 3-5 of silica sol, 6-8 of calcium aluminate, 60-80 of volcanic rock, 6-9 of PA6 nylon powder, 3-4 of gelatin, 1-3 of ammonium bicarbonate, 6-9 of ZSM-5 molecular sieve, 2-4 of chrome oxide, and a proper amount of deionized water. Chrome oxide and ZSM-5 molecular sieve added in the adsorbent can effectively adsorb pollutants during a waste water processing process, have a good adsorption effect on heavy metals, and can purify water. The prepared adsorbent is large in adsorption capacity, high in adsorption efficiency, and is good in regenerability, and is liable to be desorbed. An expected effect on waste water processing can be reached, and the adsorbent has excellent economic benefits and social benefits, and is worthy of popularization.