360results about How to "High adsorption activity" patented technology

The invention discloses a low-temperature selective catalytic reduction denitration catalyst and a preparation method thereof, wherein the catalyst takes an attapulgite as a carrier to load nano-composite materials of manganese oxide nano-particles; the structure thereof is as follows: manganese oxide particles with the particle diameter of less than 20nm are loaded on the rod-shaped crystal surface of the attapulgite with the diameter of 40-50nm; one or more types from iron, copper and nickel are added as an additive; and calculated according to the mass percentage of manganese, the content of the manganese oxide in the catalyst is 0.1-20. The preparation method comprises the steps of: firstly extruding, drying and crushing the attapulgite clay, and then preparing attapulgite clay powderinto suspension liquid; adding acid solution to wash and remove carbonate impurities, adding manganese salt, and then adding alkali solution for stirring so as to lead the manganese ion to be hydrolyzed and precipitated and loaded onto the crystal surface of the attapulgite, and finally obtaining the product after centrifugal washing, dewatering, drying and calcinations. The catalyst takes ammoniaas a reducing agent, and has higher activity of catalyzing NH3 and reducing NO reaction within the scope of 120 DEG C to 350 DEG C.

The invention is concerned with the plastic framework-style bentonite composite sorbent and the preparation method. The crude bentonite or the character-changed bentonite is the main material for the composite sorbent, the thermoplastic macromolecule polymer is as the framework connecting material and also add the assistant selective material, the blowing hole-make material by the working procedure such as mixture, model melt extrude, dryness and cut grain. The preparation method is dry preparation method with simple process and without secondary pollution, the product can adjust the powder intensity, the size of the hole, the porosity, the density and the adsorbing selectivity according to the change of the selected group and dosage. The sorbent is not easy pulverization in water which can use for waste water dispose with heavy metal ion and organic infectant.

The invention belongs to the technical field of hydrofining catalysts, and particularly relates to a hydrofining catalyst carrier and a preparation method thereof as well as a hydrofining catalyst using the carrier and a preparation method of the hydrofining catalyst. The preparation method of the carrier comprises the steps of: mixing modified diatomite, alumina powder, a bonding agent and a pore-enlarging agent, then kneading and forming, drying and roasting to obtain the carrier, and is characterized in that the modified diatomite is prepared by steeping diatomite in alkali liquor and neutralizing in acid liquor and then carrying out water washing and filter pressing, wherein the amount of impurities on the surface and in pore spaces can be greatly reduced, thereby being beneficial to load of active ingredients; and the hydrofining catalyst prepared by using the carrier is applicable to removal of organic sulfides and unsaturated hydrocarbons in light naphtha, liquefied gas, natural gas and oil refining dry gas.

The invention relates to a method for preparing activated carbon by catalyzing and activating microorganism white-rot fungi or enzymes, which belongs to the technical field of activated carbon preparation. According to the preparation method, tobacco solid waste is used as a raw material, and a product is obtained through simple processes of pretreating the raw material, preparing a tobacco activated base by microorganism white-rot fungi culture or enzyme catalysis and activation and preparing the activated carbon. The method has the characteristics of wide raw material source, low waste utilization cost, low energy consumption in the production process, no secondary pollution, benefit to environmental protection, good adsorptive property and wide application of the activated carbon production, and the like. The method can be widely applied to preparing the activated carbon by taking the tobacco solid waste as a raw material, and the activated carbon prepared by adopting the method provided by the invention can be widely applied to the fields of waste water treatment, removal of SO2 from smoke, adsorption of odors in food fresh keeping, and the like.

The invention relates to an SCR catalyst for purifying diesel engine exhaust pollutant and a preparation method thereof. According to the catalyst, cordierite honeycomb ceramics are adopted as a carrier material, duct surfaces of the carrier are coated with a catalytic coating which is prepared by using vanadium-cerium-manganese compound oxide as an active ingredient, a silicone-aluminum molecular sieve material is used as an auxiliary, and a tungsten-titanium-silicon compound material is used as a supporting material. The method for preparing the catalyst comprises the following steps: firstly, preparing the supporting material and the active ingredient solution; then, mixing and soaking the active ingredient solution, the auxiliary and the supporting material to form catalytic coating powder; thirdly, mixing the coating powder, water and adhesive to form slurry; and finally, coating the carrier with the slurry to enable the coating amount to be 200-250g / L. The preparation method is simple, and the prepared catalyst can be used for effectively improving the efficiency for removing PM and NOx of diesel engine exhaust due to the high catalytic activity of the vanadium-cerium-manganese compound oxide and the high adsorption activity of the silicone-aluminum molecular sieve, so that 'two-effect' purification for diesel engine exhaust pollutant by the SCR catalytic unit can be realized.

The present invention discloses a preparation method for a walnut shell active carbon adsorbent for purifying low concentration phosphine. According to the preparation method, a walnut shell raw material is subjected to treatments of crushing, washing and drying; the treated walnut shells are placed in a tube type furnace to carry out carbonization for 1 hour at a certain temperature under protection of nitrogen to obtain a carbonized material; the carbonized material is uniformly mixed with an activator potassium hydroxide according to a certain ratio; the resulting mixture is place in the tube type furnace to carry out activation for 1 hour at a certain temperature under protection of nitrogen; the walnut shells are washed by hydrochloric acid, and rinsed by hot distilled water until the pH value of the walnut shells is neutral, then the walnut shells are dried to obtain the walnut shell active carbon; the walnut shell active carbon is subjected to a metal supported modification treatment, wherein metal active components comprise copper, zinc and lanthanum; then treatments of ultrasonic impregnation, drying and baking are performed to prepare the walnut shell active carbon adsorbent. The walnut shell active carbon adsorbent is characterized in that: with adopting the walnut shell active carbon adsorbent to treat the waste gas containing the phosphine, advantages of high purification efficiency, large adsorption capacity, low cost and the like are provided; the development of the adsorbent provides a simple and feasible approach for comprehensive utilization of the agricultural and forestry waste walnut shells and purification of the phosphine waste gas.

A high-temp dechlorinating agent is prepared from natural sepiolite as both active component and carrier, alkali-metal and alkali-earth metal compound as active component, and the inorganic or organic adhesive and pore-enlarging agent for high reaction power and stability. It can be used to remove hydrogen chloride from high-temp (650 deg.C) gas to lower than 0.5 ppm and make chlorine content reach 36%. Its advantages are high purifying power and chlorine content, simple preparing process and low cost.

The invention relates to a preparation method of nano-hydroxyapatite / sodium alginate composite material. The obtained material can be used for sewage treatment and used for adsorbing and removing heavy metal ions. The method comprises the following steps: quickly pouring a diammonium hydrogen phosphate aqueous solution in the aqueous solution of calcium nitrate, uniformly stirring and mixing, centrifuging to obtain a precipitate, washing the precipitate by using deionized water, re-dispersing the washed precipitate to the deionized water; adding a stabilizer in the obtained suspension, ultrasonically dispersing to obtain stable hydroxyapatite suspension; controlling the mass ratio of hydroxyapatite to sodium alginate, adding sodium alginate in the hydroxyapatite suspension; continuously heating and stirring, controlling the reaction time, evaporating water, carrying out freeze-drying to obtain the product. The preparation method has the advantages that the preparation process is simple and controllable, the raw material resource is wide, the cost is low, environment is protected, the pollution does not exist, the uniform compounding of the hydroxyapatite nano-particles and sodium alginate is realized, and the uniform dispersion and the non-reunion of the hydroxyapatite nano-particles are guaranteed.

The invention relates to preparation methods of porous carbon from towel gourd vegetable sponge and a composite material of the porous carbon and application of the porous carbon and the composite material in supercapacitor electrode materials. The method for preparing the porous carbon comprises the following steps: (1) washing the towel gourd vegetable sponge, and performing carbonization heat treatment in an atmosphere containing NH3 at a proper temperature; (2) mixing the carbonized product and KOH in a proper proportion, and activating in N2 at the temperature of 750 DEG C. The inner diameter of pore passages of the prepared porous carbon is between 1mu m and 15mu m, the pore wall thickness is between 0.3mu m and 1mu m, and the activated specific surface area can be 1510m<2> / g. The method for preparing the composite material comprises the following steps: reacting the porous carbon with a KMnO4 solution, and growing MnO2 nanosheets, thereby obtaining a porous carbon / MnO2 composite material; or reacting the porous carbon with aniline to obtain a porous carbon / aniline composite material. When serving as the supercapacitor electrode materials, the prepared porous carbon and the composite material thereof have more excellent performance and favorable application prospect compared with a conventional carbon material.

The invention relates to active boron nitride, in particular to active boron nitride, a preparing method of the active boron nitride and application of the active boron nitride to adsorption for reducing content of sulfur in fuel oil. A surface active agent is dissolved in a mixed solution of water and methyl alcohol, then boric oxide and a nitrogen source are dissolved in the above solution, stirring is conducted at the temperature ranging from 50 DEG C to 90 DEG C for evaporation, and after all the solution is evaporated, an obtained solid is placed in a tubular furnace, high temperature roasting is conducted for 5 h in the nitrogen or ammonia atmosphere, and the active boron nitride with the high specific surface area is obtained. The invention provides a novel active boron nitride adsorbent, the specific surface area is large, the adsorption activity is high, and sulfide in the fuel oil can be efficiently removed with low energy consumption. Meanwhile, the preparing method is simple, and cost is low.

The invention discloses a heavy metal contaminated soil passivation conditioning agent, and an application thereof. The conditioning agent comprises a part A, a part B and a part C. The part A comprises organic matter, a fermentation agent, and a microbial agent. The part B comprises fly ash, humate, biomass carbon, a phosphorus-containing fertilizer, and granular activated red mud. The part C comprises bentonite and iron powder. The weight ratio of the part A to the part B to the part C is (20-30) to (20-40) to (40-60). When the conditioning agent provided by the invention is used in heavy metal contaminated soil treatment, the cost is low, the dose is low, reparation time is short, operation is simple, implementation is easy, and the application range is wide. The influence on soil original pH value is low, the reparation efficiency is high, and the reparation effect is stable. The conditioning agent has a passivation effect upon heavy metals, and performs bidirectional conditioning upon soil pH value. The conditioning agent is suitable for agricultural mechanized operation, and has a sustained-release function.

The invention discloses an organic compound fertilizer. The fertilizer is prepared from following raw materials in parts by weight: 20-30 of livestock manure, 10-14 of bone meal, 20-25 of gangue, 9-12 of oyster shell powder, 15-18 of coal slime, 20-22 of coal ash, 10-12 of urea, 15-18 of potassium dihydrogen phosphate, 20-24 of potassium chloride, 3-5 of zinc sulfate, 2-3 of ammonium molybdate, 9-12 of ammonium nitrate, 6-9 of ammonium bicarbonate, 3-5 of borax and 9-12 of a soil conditioner. The livestock manure, the bone meal, the gangue, the oyster shell powder, the coal slime, the coal ash, and other natural raw materials are adopted by the organic compound fertilizer. The raw materials are convenient to take and low in cost, and therefore the production cost is largely reduced and the organic compound fertilizer is prone to popularization in fertilizer production. In addition, the fertilizer is rich in nutrition and can improve the soil structure. The oyster shell powder contains a large amount of calcium carbonate, and essential trace elements comprising copper, magnesium, potassium, molybdenum, phosphor, manganese, iron, zinc, and the like for animals. The pearl powder layer of the oyster shell contains a plurality of amino acid components. The oyster shell powder can provide rich nutrients for the fertilizer. The coal ash is one of the industrial residues with large discharge amount at present in China. The coal ash is in a porous honeycomb structure and has large specific surface area, high absorptivity and strong water absorptivity.

The invention discloses a preparation method of super-hydrophobic oleophilic graphene aerogel. The method comprises the following steps of combining graphene oxide with ammoniated silicon dioxide particles at a particle size of 20 nm / 50 nm and performing magnetic-stirred reaction in an oil bath pan at 75 DEG C to produce a silicon dioxide / silicon dioxide compound; dissolving the obtained compound in water, adjusting the PH value to 11 through ammonia, then subjecting the compound to reaction in a 180 DEG C hydrothermal reactor for 24 hours; performing cooling and drying to obtain the super-hydrophobic oleophilic graphene aerogel. The obtained super-hydrophobic oleophilic graphene aerogel has the advantages of being large in absorbing capacity, rapid in oil absorption, beneficial to recovery of leaked oil, reusable and the like and accordingly has a good application prospect in the aspect of oil-water separation.

The invention discloses a reformed pre-hydrogenation catalyst which comprises the following components: 2-9wt% of NiO, 1-7wt% of CoO, 15-40wt% of WO3 active component, 40-60wt% of an alumina carrier and 3-10wt% of amorphous FeOOH assistant. The preparation method of the reformed pre-hydrogenation catalyst comprises the steps of: (1) dry-mixing aluminum oxide or an aluminum oxide lead compound with an amorphous FeOOH or regenerated amorphous FeOOH waste desulfurizing agent, subsequently adding into a binder to be kneaded and shaped, and further being dried to obtain the carrier; and (2) adding water into a soluble nickel salt, a soluble cobalt salt and a soluble tungsten salt and mixing up so as to obtain a Ni-Co-W steeping liquid, steeping the carrier into the Ni-Co-W steeping liquid and drying so as to obtain the reformed pre-hydrogenation catalyst. The amorphous FeOOH in the hydrogenation catalyst can adjust and control an active metal into an amorphous structure, so that the absorption of the active metal to a reactant is improved, and furthermore the activity of the catalyst is improved.

The invention provides a formaldehyde adsorbing decomposing agent which is prepared by the following specific steps of: mixing 180-200 parts by weight of activated carbon powder with 10-30 parts by weight of zeolite molecular sieve powder uniformly, adding 25-40 parts by weight of potassium hydroxide water solution with mass fraction of 5-10% to the mixture and drying the mixture after uniformly stirring; and adding 2-8 parts by weight of microcrystalline cellulose to the dried mixture, then adding 9-20 parts by weight of potassium permanganate powder and mixing the materials uniformly, thus obtaining the formaldehyde adsorbing decomposing agent. The decomposing agent utilizes various mechanisms which adsorb and decompose formaldehyde, is thorough in adsorption, has good decomposition effects and has the advantages of simple preparation method and low cost.

The invention discloses a palladium catalyst for processing chlorinated organics and a method for preparing the same, which belong to the technical field of environment. The catalyst of the invention comprises a carbonaceous carrier and metal palladium, wherein the ratio of the metal palladium to the carbonaceous carrier in part by weight is 0.1-10:100. The method of the invention comprises the following steps: firstly performing acid pretreatment on the carbonaceous carrier; and loading the metal palladium on the carbonaceous carrier by an oxidation reduction method. Active metallic components Pd prepared by the method of the invention are uniformly distributed on the surface of the carbonaceous carrier in an amorphous state, have size distribution less than 5 nm and have the characteristics of strong adhesion, high dispersity and high effective utilization ratio. When in use as an electrochemical cathode catalyst, the multifunctional Pd-loaded catalyst not only endows the chlorinated organics with electroreduction dechlorination capacity (hydrogen is introduced), but also can produce H2O2 through electroreduction (air is introduced). Cathode electroreduction dechlorination and oxidization are combined to treat chlorinated organics wastewater so as to fulfill the aims of full decontamination, energy consumption reduction and decontamination efficiency improvement.

The method relates to a method for preparing transitional metal ion copper modified adsorbent for purifying low-concentration phosphine, which is mainly used for removing low-concentration phosphine in industrial production tail gases and belongs to the technical field of application of adsorption separation technique in atmospheric pollution purification. The method comprises the following steps of: (1) carrying out ultrasonic washing and repeated drying treatment to an adsorbing material carrier until a constant-weight carrier is formed; (2) selecting a soluble copper salt to carry out ultrasonic immersing modification to the pretreated adsorbent carrier; (3) washing and drying the immersed adsorbent carrier; and (4) roasting the dried adsorbent carrier, and reducing the temperature to room temperature. The adsorbent prepared in the invention is unnecessary to add accelerating agents, such as noble metals or high-contamination heavy metals and the like; when the adsorbent is used for adsorbing waste gas containing phosphine, the adsorption is conducted by the surface of the modified adsorbent; waste gas dephophorization can be realized after the adsorption is saturated; and the adsorption activity is higher within in a certain temperature range.

The invention discloses a fluidized bed type organic exhaust purification method and device to solve the problems of the existing organic exhaust purification technology that processes are complicated, cost is high and efficiency is low. The method comprises the steps of adsorption and desorption. The device comprises an adsorption chamber and a desorption chamber, wherein an exhaust inlet is formed in one side of the adsorption chamber, a purified tail gas outlet is formed in the other side of the adsorption chamber, an adsorption medium moving downwards is arranged in the adsorption chamber, the desorption chamber is located below the adsorption chamber, the adsorption medium falls into the desorption chamber from the adsorption chamber, a carrier gas inlet is formed in one side of the desorption chamber, a carrier gas is formed in the other side of the desorption chamber, and a desorption device is arranged in the desorption chamber. According to the fluidized bed type organic exhaust purification method and device, technology and structure are simple, operation is convenient, exhaust purification cost can be effectively reduced, and exhaust purification efficiency can be improved.

The invention relates to a high-temperature dechlorination agent, which consists of 0 to 42 wt percent of CaOH, 18 to 70 wt percent of CaO, 20 to 40 wt percent of hydrotalcite, 7 to 17 wt percent of clay and 0 to 7 wt percent of adhesive. Based on the high-temperature dechlorination agent, the invention further discloses a preparation method of the high-temperature dechlorination agent. The high-temperature dechlorination agent prepared by the preparation method can be applied to a coal gasification fuel cell (MCFC) system, a coal gasification combination circulation power generation (IGCC) system and catalytic reforming regeneration gas so as to remove the HCl; furthermore, the dechlorination agent has high chlorine content and good dechlorination effect.

The invention discloses a method for realizing iron ore sintering NOx and dioxin emission reduction by recycling waste activated carbon, the method comprises the following steps: water immersion, grinding and drying pretreatment are performed on the waste activated carbon to obtain activated carbon powder, after a urea solution is sprayed on the surface of the activated carbon powder, the activated carbon powder is mixed with raw materials comprising a coarse grain fuel, slaked lime and fine-grain hematite for granulating to obtain a granular material I; raw materials comprising an iron-containing raw material, a fusing agent and a fine granular material are mixed for granulating to obtain a granular material II; the granular material I and the granular material II are uniformly mixed andsequentially subjected to material distribution, ignition and sintering. According to the method, under the condition that the sintering production quality index is not influenced, the waste activatedcarbon is used to replace part of coke powder or anthracite, the waste activated carbon can be recycled, NOx and dioxin emission in the sintering process can be reduced, follow-up tail end treatmentpressure is reduced, and the sintering production cost is reduced.

The invention provides a preparation method of an adsorbent for industrial wastewater treatment. The preparation method particularly includes steps: (1), preparing modified composite powder; (2), preparing a composite crosslinking adsorbent; (3), preparing a magnetic composite crosslinking adsorbent. Kaolin and sepiolite are composited to serve as a basic adsorbent raw material, and the characteristics that kaolin and sepiolite have high specific surface area, complex pore structure and excellent adsorption site are fully combined, so that adsorption activity when a single raw material is used as an adsorbent is improved greatly. In addition, a quaternary ammonium salt surfactant and cetyl trimethyl ammonium bromide are adopted to modify kaolin and sepiolite, so that alternating performance and adsorption performance of the adsorbent are improved; by introducing polyvinyl alcohol and chitosan for crosslinking reaction, stability and strength of the adsorbent are improved, and the obtained adsorbent can efficiently adsorb pollutants like heavy metal ions, dye and petrochemical pollutants in industrial wastewater.

The invention discloses a preparation method of a fly ash chitosan composite adsorbent for treating printing and dyeing wastewater, which can be widely applicable to treatment of industrial wastewater and other wastewater containing active bright red X-3B. One raw material of the technology is wide in source and low in price; and a method for treating the wastewater containing the active bright red X-3B is simple, high in treatment efficiency and low in cost. An adsorption material for treating the wastewater containing the active bright red X-3B is modified fly ash and is modified by chitosan; and a modification method is simple and the cost is low. By adopting the research method, the use amount of the chitosan can be saved and the cost is reduced; and the fly ash can be modified and the adsorption performance of the fly ash is improved so that the aim of utilizing wastes is realized; and an environmental protection value is very high.

The invention belongs to the technical field of genetic engineering, and relates to recombinant hexamer protein A as well as the constitution method and the application thereof. The recombinant hexamer protein A has an amino acid sequence represented by SEQ ID NO.1 in a sequence list. The recombinant hexamer protein A has higher activity than those of the reported recombinant protein A and the natural protein A, and has high yield and relatively simple purification process, thereby preventing the risk of pathogenic bacteria of naturally extracted protein. Additionally, the recombinant hexamer protein A suits large-scale production.

The invention discloses a preparation and regeneration method for water treatment defluoridation filter material based on a natural mineral. The invention is that natural bauxite ores are used as raw materials, are roasted at high temperature at two stages after crushing, screening and pretreatment through hydrochloric acid, and finally are cooled to obtain the defluoridation filter material. After the defluoridation filter material loses efficacy, the defluoridation filter material can be reused after inorganic aluminum salt solution is used for soaking the defluoridation filter material. The invention has the advantages that the water treated by using the defluoridation filter material can fully satisfy the standard that fluorine content in drinking water is lower than 1.0mg / L, the source of the raw materials is wide, the preparation is simple and convenient, the cost is low and the application prospect is good.

The invention belongs to the field of magnetic materials, in particular to a silicon dioxide magnetic composite particle and a method for preparation. Ferrite-silicon dioxide core-shell nano particles are dispersed to alcohol-water mixed solvent, inorganic salt and organic cross-linking agent are added, then ammonia and a little silicon source are added to solution, thereby forming a steady cross bonding body. During the process of preparation, the size and the specific surface of the silicon dioxide magnetic composite particles can be controlled and formed through changing the size and the concentration of the ferrite-silicon dioxide core-shell nano particles, the concentration of inorganic salt, the concentration of the organic cross-linking agent and the addition of the silicon source. The surface of the particle is equipped with small-sized nanometer processes, the specific surface area thereof is bigger, the adsorption activity is stronger, and the adsorption capacity is also bigger. The silicon dioxide magnetic composite particle and the method for preparation are very suitable for separation, purification, marking and detection of various biological materials and medical products. The method for preparation has simple technical process, has low requirements for equipment, is easy to control conditions, and is easy to achieve batch production.

The invention discloses a medium material for removing underground water heavy metal arsenic pollution. The medium material is prepared by mixing manganese ore, sepiolite, straw, animal waste, active sludge and active bacterial agent with the mass ratio of 1 to (0.2-0.5) to (0.5-1) to (0.2-0.4) to (0.2-0.4) to (0.0005 to 0.002), composting, carbonizing, and crushing so as to prepare the particle material with the average particle diameter of 1-3cm. The invention also discloses a method for preparing the medium material. The medium material can effectively remove arsenic with polyvalency in underground water, is long in service life, and cannot cause secondary pollution of underground water.

The present invention provides a medium-high temperature dechlorination agent for removing hydrogen chloride gas and a method for making the same. The dechlorination agent is made of active ingredients, a carrier, an auxiliary agent and an adhesive. The active ingredient is obtained by fully mixing glucose with at least one selected from the group consisting of calcium nitrate, magnesium nitrate, zinc nitrate and sodium bicarbonate. The carrier and the auxiliary agents are ZSM-5 or a molecular sieve. The adhesive is methyl cellulose. The preparation method comprises: blending the active ingredients; adding the aqueous solution of the active ingredients into the pretreated carrier and auxiliary agent, in a dropwise manner; rotating; heating; drying; baking; forming; and granulating to obtain the dechlorination agent. The dechlorination agent can remove hydrogen chloride gas of exhaust gas effectively and deeply at a temperature of 423-1073 K, with a breakthrough chlorine capacity of 63% or more.

The invention provides a method for preparing iron-based magnetic activated carbon from by catalytic activation of radix puerariae waste residue with compound enzyme, and belongs to the technical field of activated carbon. The method comprises the steps of by taking the radix puerariae waste residue as the raw material, carrying out raw material pretreatment, preparing a radix puerariae activated substrate through catalytic activation with compound enzymes (cellulase, ligninase and pectinase), and preparing the magnetic activated carbon by doping iron, thereby obtaining the product. The method provided by the invention has the characteristics of wide raw material source, low waste material utilization cost, few production steps and low process energy consumption and no secondary pollution, and is beneficial to environment protection; the activated carbon product are excellent in adsorptive property and the magnetic properties and wide in application, and secondary pollution caused by difficult activated carbon recovery is not generated, etc. The method can be widely applied to preparation of the magnetic activated carbon by using the radix puerariae residue solid wastes as raw materials and doping iron; the activated carbon prepared by the method can be widely applied to the fields of waste water treatment, oil fume desorption and odor adsorption in food preservation and the like.

The invention relates to a preparation method of a hydrotalcite-like compound-based powder explosion suppressant, and belongs to the technical field of explosion suppressant preparation. The preparation method comprises the following steps: taking silkworm cocoons as a raw material; putting the silkworm cocoons into a grinder to carry out grinding and soaking the grinded silkworm cocoons by usingdopamine solution; mixing the soaked silkworm cocoons with a metal sale solution; adding a complexing agent to carry out a hydrothermal reaction; calcining a product obtained via the hydrothermal reaction to obtain a hydrotalcite-like compound matrix; and finally mixing the hydrotalcite-like compound matrix with metallothionein and urea so as to finally obtain the powder explosion suppressant. Theobtained powder explosion suppressant is good in explosion suppression performance and extremely strong in explosion energy adsorption capability, and has a wide application prospect.

The invention relates to a method for preparing transitional metal ion Co modified adsorbent which is used for purifying low-concentration phosphine and mainly used for removing low-concentration phosphine in industrial production tail gas, belonging to the technical field of application of adsorption separation technique in atmospheric pollution purification. The method comprises the following steps of: (1) carrying out ultrasonic washing and drying treatment to an adsorbing material carrier until a constant-weight carrier is formed; (2) selecting a soluble cobalt salt to carry out ultrasonic immersing modification to the pretreated adsorbent carrier; (3) washing and drying the immersed adsorbent carrier; and (4) roasting the dried adsorbent carrier, and reducing the temperature to room temperature. The adsorbent prepared in the invention is unnecessary to add accelerating agents, such as noble metals or high-contamination heavy metals and the like; when the adsorbent is used for adsorbing waste gas containing phosphine, the adsorption is conducted by the surface of the modified adsorbent; waste gas dephophorization can be realized after the adsorption is saturated; and the adsorption activity is higher within in a certain temperature range.