72results about How to "Strong physical adsorption" patented technology

The invention relates to a method for preparing a tobacco sheet capable of reducing harmful substances in smoke, which comprises the following steps of: (1) after extracting tobacco powder and tobacco stalks, which are used as the raw materials, by hot water or 75 to 95 mass percent of ethanol, concentrating into tobacco concentrated solution with the solid content of 20 to 55 percent; (2) adding 0.05 to 5 mass percent of metallic oxide, metal salt and a mixture in any ratio into the tobacco concentrated solution; (3) adding 0.05 to 8 percent of inorganic mineral adsorbing material into the tobacco concentrated solution to obtain a composite additive; and (4) coating the tobacco concentrated solution added with the composite additive on a substrate of the tobacco sheet. When the tobacco sheet prepared by the method is burnt, on one hand, the pyrolysis process in the burning process can be catalyzed and the generation of benzene ring substances and the like can be reduced, and on the other hand, generated particle substances with high molecular mass, particularly substances containing benzene rings, are adsorbed into a pore structure of the additive, so that the aim of avoiding the harmful substances being sucked into the mouth is fulfilled.

The invention discloses a preparation method of a cellulose-based core-shell CdS / ZnO (cadmium-sulfur / zinc oxide) photocatalyst. The preparation method comprises the following steps of using a renewable resource of cotton cellulose as a template agent, selecting proper cadmium source / sulfur source reagents, and adopting a hydrothermal synthesis method to prepare the cellulose-based CdS; mixing with an inorganic zinc source solution, drying, and performing microwave high-temperature calcining under the nitrogen atmosphere, so as to obtain the cellulose-based core-shell CdS / ZnO photocatalyst. The cellulose-based core-shell CdS / ZnO photocatalyst has the advantages that the shape is controllable, the photocatalytic and recycling properties are good, and the photocatalytic activity under visible light is obviously higher than the photocatalytic activity of cellulose-based CdS / ZnO; the preparation method has certain theoretical and realistic meaning on the synthesis of heterogeneous core-shell materials and the purification of dye wastewater.

The invention relates to an SO2 adsorbing material and a preparation method thereof, and the SO2 adsorbing material is obtained by taking a zinc-based metal organic framework material as a matrix, doping a certain amount of amino acid and carbonizing at a certain temperature. The SO2 adsorbing material disclosed by the invention is prepared by adopting the method disclosed by the invention. The SO2 adsorbing material is obtained on the basis of a modified zinc-based metal organic framework material, has high SO2 adsorbing capacity and selectivity, and is particularly beneficial to efficient physical adsorption of SO2.

The invention relates to a SO2-containing gas treatment method and device; the SO2-containing gas is compressed in a compression unit and then enters an adsorption unit to be adsorbed, an adsorption material adopted by the adsorption unit is a modified zinc-based metal organic framework material, and desorption regeneration is carried out after adsorption penetration. According to the invention, efficient physical adsorption of SO2 can be realized, frequent operation is not needed, the SO2 recovery rate is high, the operation stability is good, and the purified gas meets the emission requirements.

The invention relates to a preparation method of an iron and cyclodextrin co-modified biochar composite material. According to the invention, beta-cyclodextrin and iron are introduced to the biochar surface to obtain the iron and beta-cyclodextrin co-modified biochar composite material. The material has good adsorption and catalytic degradation performance, and has adsorption and catalytic degradation performance on organic pollutants and heavy metals at the same time. The iron and beta-cyclodextrin co-modified biochar on the one hand enhances the water solubility of the material, and on the other hand increases the active sites of the material, thus greatly improving the adsorption and catalytic degradation performance.

The invention relates to a treatment method of sulfur dioxide-containing flue gas, which comprises the following steps: compressing and condensing the sulfur dioxide-containing flue gas in a compressing and condensing unit, feeding into a condensing and liquefying unit, feeding non-condensable gas into an adsorption unit for adsorption, and discharging purified gas after reaching the standard, wherein an adsorption material adopted by the adsorption unit is a modified MIL-(Al) metal organic framework material, desorption is performed after adsorption penetration, and desorbed gas and to-be-treated flue gas are mixed and enter the compressing and condensing unit. According to the invention, efficient physical adsorption and recovery of SO2 can be realized, the liquefaction energy consumption is relatively low, the SO2 recovery rate is high, the operation stability is good, and the purified gas meets the emission requirements.

The invention provides a magnetic iron oxide / sepiolite nanocomposite. The nanocomposite is powdery and prepared through the following steps that sepiolite and glucose serve as raw materials, mixed liquid A is prepared, a hydrothermal carbonization reaction is conducted, a generated brown substance is washed, and after the brown substance is dried, sepiolite nanofibers with multifunctional active groups are acquired; mixed liquid B is prepared from the sepiolite nanofibers and ferric acetylacetonate and stirred, after being evenly mixed, the sepiolite nanofibers and the ferric acetylacetonate are placed in a reaction kettle for a solvothermal reaction, a generated substance is washed, dried and ground into powder, aerobic calcination is conducted, and therefore the magnetic iron oxide / sepiolite nanocomposite is acquired. By the adoption of the magnetic iron oxide / sepiolite nanocomposite, inorganic trivalent arsenic removal efficiency is high, capacity is large, cyclic use is achieved, the nanocomposite has the magnetic performance so as to be separated rapidly, and recycling and reuse are achieved. Meanwhile, a preparation method of the magnetic iron oxide / sepiolite nanocomposite is provided and the magnetic iron oxide / sepiolite nanocomposite has the advantages of being low in cost, easy and convenient to operate, easy to synthesize on a large scale and the like.

The invention discloses micro-nano composite particles. Nano-scale and sub-nano-scale particles smaller than the pore diameter of porous micro-nano particles are inserted into the porous micro-nano particles to form three-dimensional porous and / or spiny micro-nano composite particles; a single-pore embedded amount of the three-dimensional porous and / or spiny micro-nano composite particles is 1-100% of a pore volume. The invention also discloses six preparation processes of the above micro-nano composite particles, a liquid phase insertion method, a high-speed gas flow energy embedding method,a high-temperature reconstruction insertion method, a mechanical load embedding method, a vacuum negative pressure embedding method and a multi-rotor physical continuity modification method are included, the above methods are easy to operate, and the prepared micro-nano composite particles have good dispersion, do not easily agglomerate, and can be applied to polymers and products thereof. The particles have a good reinforcing effect in a rubber and a product thereof, show excellent mechanical properties, and also show a synergistic improving effect of reinforcing, low heat generation and wetslip resistance in a tire rubber.

The invention relates to a process for preparing the Gua-water in the Dabie mountain area, which comprises the steps of (1) selecting the mountain spring water in the Dabie mountain area as the raw water and filtering the raw water by a sand filter; (2) filtering the water treated in the step (1) by the activated carbon, wherein the particle size of the activated carbon is 0.42-0.65 mm during the filtering process; (3) filtering the water treated in the step (2) by a manganese sand filter; (4) sterilizing the water by medium-pressure ultraviolet rays; (5) treating the water by adopting the UH reverse osmosis technique; (6) sterilizing the water by means of ozone and fully mixing the ozone with the water during the sterilizing process, wherein the ozone content in the water reaches 0.12 mg / L; (7) completing the aseptic filling process of the treated water. According to the invention, the water prepared by the above process is free of pollution, pathogens, heavy metals and harmful chemical substances. Meanwhile, the water contains minerals and trace elements necessary for human bodies. Moreover, the water, free from degrading, is in the form of alkalescent small molecular group water and is strong in activity. In addition, the water is rich in beneficial minerals, such as strontium, zinc, selenium, metasilicic acid and the like.

The invention discloses dyed paper as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) shredding natural-color bamboo pulp and natural-color bagasse pulp, adding the shredded natural-color bamboo pulp and natural-color bagasse pulp into water, fully soaking, defibering, fishing out, squeezing to obtain mixed pulp I, adding viscose fibers and a dye, adding water to adjust the concentration of the pulp to 10 + / -2 mass%, and grinding the pulp until the beating degree is 15-30 degrees SR to obtain dyed pulp; (2) heating the dyed pulp to 45-80 DEG C, then sequentially adding a color fixing agent, a wet strength agent and a sizing agent, and continuously stirring uniformly to obtain mixed pulp II; carrying out papermaking to obtain wet paper sheets; and finally, squeezing, drying and calendaring the wet paper sheets to obtain the dyed paper. A series of color fixing agents, wet strength agents and sizing agents are adopted underthe heating condition, paper pulp coloring is facilitated, the dye-uptake rate and color uniformity of paper are improved, paper de-coloration is reduced, dyed paper is endowed with an excellent mechanical performance, and industrialization can be achieved.

The invention specifically relates to a hard water softening agent and its preparation method and application, belonging to the field of tap water treatment. The hard water softening agent comprises the following components by weight: 15-25% of diatomite, 1-5% of sodium carbonate, 1-2% of sodium hydroxide and 10-20% of activated carbon, with the balance being deionized water. The hard water softening agent provided by the invention purifies and softens tap water in one step and is convenient and quick; through addition of the activated carbon, residual chlorine in tap water can be effectively filtered out; in particular, the diatomite is added into the purifying softening agent, so the softening agent is allowed to have good physical adsorption properties due to the great specific surface of the diatomite; after calcium and magnesium ions in tap water form precipitates with sodium carbonate and sodium hydroxide in the purifying softening agent, the precipitates can be adsorbed by the diatomite; and the design of a filter column makes the calcium and magnesium ions in tap water to be fully precipitated, so residual chlorine can be effectively filtered out.

The invention relates to a treatment method of sulfur dioxide-containing waste gas; the sulfur dioxide-containing waste gas is compressed in a compression unit and enters an adsorption unit for adsorption; an adsorption material adopted by the adsorption unit is a modified MIL-(Al) metal organic framework material, desorption is performed after adsorption penetration, desorbed gas is compressed and condensed in the liquefaction unit, and non-condensable gas and compressed flue gas are mixed and then enter the adsorption tower. According to the invention, efficient physical adsorption and liquefaction recovery of sulfur dioxide can be realized, frequent operation is not needed, the SO2 recovery rate is high, the operation stability is good, and the purified gas meets the emission requirements.

The invention relates to a honeycomb structure ceramic particle filter screen, which is composed of a base material, a frame, a bottom, a top cover and a filtering material, the frame, the bottom and the top cover form a hollow frame body of the filter screen, the base material is provided in the hollow frame body, and the filtering material is provided in the base material. Compared with the prior art, the purifying efficiency is greatly increased, a porous purifying ceramic contains a photocatalysis function material, the tunnel is more complex than active carbon, the specific surface area is higher, and the effects are more and better, and the filter screen has strong physical absorption performance, and excellent effects for sterilizing and removing harmful chemical substances, the air purifying efficiency is greatly increased, a manufacturing method is simple, the process is simple and convenient, the filter screen can be widely used, and can be used for various air purifying devices.

The invention relates to a production technique of Dabie Mountain area mineral water. The production technique is characterized by including: selecting Dabie Mountain area spring water as original water, filtering the original water via a PP cotton filter, a grit filter, activated carbon and a manganese sand filter, sterilizing the original water through medium-pressure ultraviolet, treating the original water with a UH reverse osmosis technique, sterilizing with a high intensity pulsed electric field, and performing sterile filling to obtain the Dabie Mountain area mineral water. The water provided is free of pollution, pathogenic bacteria, heavy metals and harmful chemicals; the mineral water contains minerals and trace elements needed by the body; the mineral water is no-degradation water in weakly alkaline and is micromolecule water high in activity; the mineral water is rich in beneficial minerals like strontium, zinc, selenium and metasilicic acid.

The invention relates to a method and a device for treating SO2-containing flue gas, which are characterized in that SO2-containing gas is compressed and condensed in a compressing and condensing unitand then enters a condensing and liquefying unit, non-condensable gas enters an adsorption unit for adsorption, and the purified gas is discharged after reaching the standard; an adsorbent adopted bythe adsorption unit is a modified zinc-based metal organic framework material, desorption is carried out after adsorption penetration, and desorbed gas is mixed with SO2-containing flue gas to be treated and then enters the compressing and condensing unit. According to the invention, efficient physical adsorption and liquefaction recovery of SO2 can be realized, the liquefaction energy consumption is reduced, the SO2 recovery rate is high, the operation stability is good, and the purified gas meets the emission requirements.

The invention relates to a preservative film and a method for preparing the same. The preservative film comprises a resin base film, an ethylene adsorption layer and a waterproof ventilation layer which are sequentially arranged on a stacked manner. The ethylene adsorption layer comprises hollow porous polymer micro-spheres with supported adsorbents, and the adsorbents comprise potassium permanganate and are at least partially supported inside the hollow porous polymer micro-spheres. The preservative film and the method have the advantages that the waterproof ventilation layer is in contact with fruits and vegetables when the preservative film wraps the fruits and vegetables, ethylene generated under the respiration effects of the fruits and vegetables can be transmitted into the ethyleneadsorption layer via the waterproof ventilation layer and can be removed by the potassium permanganate in the ethylene adsorption layer, the potassium permanganate is accommodated in the hollow porouspolymer micro-spheres, the hollow porous polymer micro-spheres have large specific surface areas, the ethylene can cross large quantities of micro-spheres when transmitted into the ethylene adsorption layer, accordingly, sufficient reaction can be carried out on the ethylene and the potassium permanganate, the reaction efficiency can be improved, the utilization rate of raw materials can be increased, the ethylene can be efficiently removed, preservation effects can be improved, and the preservation duration can be prolonged.

The invention relates to a preparation method of a ZIF8 / zinc oxide composite material for a lithium-sulfur battery functional separation layer. The method comprises the steps of firstly, preparing a three-dimensional ordered polystyrene sphere array material; secondly, preparing reverse opal-structure zinc oxide array material by the three-dimensional ordered polystyrene sphere array material; andfinally, growing a layer of ZIF8 on a surface of the zinc oxide array material to obtain the ZIF8 / zinc oxide composite material. The ZIF8 / zinc oxide composite material is coated on a surface of a basic film and is used as the lithium-sulfur battery functional separation layer, a shuttling effect of a polysulfide in preparation of a lithium-sulfur battery in the prior art can be effectively reduced, the utilization ratio of a positive electrode active substance is improved, and the integral performance of the lithium-sulfur battery is improved.

The invention provides a printing and dyeing wastewater purifying flocculating agent, and a printing and dyeing wastewater purifying application thereof. The flocculating agent meets the environmentally-friendly requirement, and has the technical advantages of excellent decolorizing and purifying effects, realization of fast decolorizing, and high purifying efficiency. The printing and dyeing wastewater purifying flocculating agent comprises a mixture of the following powdery components: N-carboxyethylchitosan, cationic starch and bentonite, wherein a mass ratio of the N-carboxyethylchitosan to the cationic starch is 2:(3-4), and a mass ratio of the bentonite to the N-carboxyethylchitosan is 5:(1-4). The invention provides the printing and dyeing wastewater purifying application of the flocculating agent. The flocculating agent has the advantages of natural degradability, non-toxicity, and low prices of above materials; and the decolorizing rate of the flocculating agent can reach 90% or above when the flocculating agent is mixed with wastewater for only 10 minutes.

The invention discloses a micro-nano composite particle and a preparation process thereof. The micro-nano composite particle is characterized in that nanometer or below nanometer size particles in thesize smaller than the micropore diameter of porous micro-nano particles are inserted into the porous micro-nano particles, so that three-dimensional porous and / or spiny micro-nano composite particlesare formed; the single hole embedded quantity of the three-dimensional porous and / or spiny micro-nano composite particles is 1 to 100 percent of the hole volume. The vacuum negative pressure embeddednanometer or below nanometer size particle process is easy to operate; the prepared micro-nano composite particle has good dispersibility; the glomeration cannot easily occur; the micro-nano composite particle can be applied to polymers and polymer products. A good reinforcing effect is achieved in rubber and rubber products; excellent mechanical property is shown; the synergistic improvement effect on reinforcement, low heat generation and wet-skidding resistant performance is shown in tire rubber.

The invention relates to the technical field of skin radioactive contamination treatment, and provides a decontamination wet tissue for radionuclide contaminated skin and application. The decontamination liquid is prepared from the following components in percentage by weight: 0.5 to 10 percent of disodium ethylene diamine tetraacetate, 0.5 to 10 percent of dimethyl(tetradecyl)amine oxide, 0.5 to 10 percent of sodium laureth sulfate, 0.5 to 10 percent of sodium bicarbonate, 0.1 to 10 percent of sodium alginate, 0.5 to 10 percent of phenoxyethanol and the balance of deionized water. The method for decontaminating the radionuclide contaminated skin comprises the following steps: step 1, unfolding a decontaminating wet tissue, flatly placing the decontaminating wet tissue on the skin, slightly squeezing the decontaminating wet tissue, wiping the skin from a low-pollution area to a high-pollution area in a single direction, folding the decontaminating wet tissue, wiping the skin by using a cleaning surface of the wet tissue, folding the decontaminating wet tissue again, and treating the decontaminating wet tissue in the same way; and step 2, repeating the step 1 on the same piece of skin by adopting three to four pieces of decontamination wet tissues in sequence to complete radionuclide decontamination treatment on the piece of skin.

The invention discloses a composite particle and a preparation process thereof. The composite particle is a particle of a nanometer and below nanometer size smaller than the pore diameter of porous micro-nano particle inserted in a porous micro-nano particle to form a three-dimensional porous and / or spiny micro-nano particle. The single-hole embedding amount of the three-dimensional porous and / orspiny micro-nano composite particle is 1-100% of the pore volume. The mechanical load embedding preparation process is easy to operate, and the prepared composite particle has good dispersibility, isnot prone to agglomerating, and can be applied to polymers and products thereof. The composite particle has a good reinforcing effect in rubber and products thereof, exerts excellent mechanical properties, and exerts a synergistic improvement effect of reinforcing, low heat generation and wet resistance performance in tire rubber.

The invention discloses micro-nano composite particles and a preparation process thereof. According to the micro-nano composite particles, nano-scale and sub-nano-scale particles smaller than the porediameter of porous micro-nano particles are inserted into the porous micro-nano particles to form three-dimensional porous and / or spiny micro-nano composite particles; a single-pore embedded amount of the three-dimensional porous and / or spiny micro-nano composite particles is 1-100% of a pore volume. A liquid phase method easily operates a process of inserting the nano-scale and sub-nano-scale particles, and the prepared micro-nano composite particles have good dispersion, do not easily agglomerate, and can be applied to polymers and products thereof. The particles have a good reinforcing effect in a rubber and a product thereof, show excellent mechanical properties, and also show a synergistic improving effect of reinforcing, low heat generation and wet slip resistance in a tire rubber.

The invention relates to the technical field of water body antibiotic pollution treatment. The invention provides a preparation method and application of cyclodextrin improved biomass coffee grounds.The preparation method comprises the following steps: step 1, pretreating coffee grounds, wherein firstly cleaning and filtering coffee grounds, then placing the coffee grounds under a vacuum condition, irradiating the coffee grounds for 10-20 minutes with ultraviolet light at the wavelength of 0.2-0.5 mm, and then placing the coffee grounds in an activating solution for activating treatment; step2, preparation of coffee grounds activated carbon: drying the pretreated coffee grounds in a drying box for 5-9 h at a drying temperature of 55-65 DEG C, then putting the coffee grounds into a tubular furnace, introducing protective gas, carrying out carbonization, sintering at the temperature of 400-800 DEG C. According to the preparation method, the low-cost coffee grounds are combined with cyclodextrin with a cavity structure to prepare an improved activated carbon; it is shown by experiment results that the beta-cyclodextrin improved coffee grounds activated carbon is high in efficiency in treatment of antibiotics and possesses excellent regeneration capacity, and can be applied to practical antibiotic wastewater treatment.

The invention discloses micro-nano composite particles and a preparation process thereof. According to the micro-nano composite particles, nano-scale and sub-nano-scale particles smaller than the porediameter of porous micro-nano particles are inserted into the porous micro-nano particles to form three-dimensional porous and / or spiny micro-nano composite particles; a single-pore embedded amount of the three-dimensional porous and / or spiny micro-nano composite particles is 1-100% of a pore volume. A high temperature reconstruction method easily operates a process of inserting the nano-scale and sub-nano-scale particles, and the prepared micro-nano composite particles have good dispersion, do not easily agglomerate, and can be applied to polymers and products thereof. The particles have a good reinforcing effect in a rubber and a product thereof, show excellent mechanical properties, and also show a synergistic improving effect of reinforcing, low heat generation and wet slip resistancein a tire rubber.

The invention relates to a mold-proof refreshing corrugated paperboard and a preparation method thereof. The mold-proof refreshing corrugated paperboard comprises a corrugated inner paper, a corrugated core paper and a corrugated surface paper; one side close to the corrugated inner paper of the corrugated core paper is provided with a mold-proof coating; one side close to the corrugated surface paper of the corrugated core paper is provided with a refreshing coating; the refreshing coating is prepared from hollow porous polymer microspheres loaded with an absorbent; the absorbent comprises potassium permanganate; at least a part of absorbent is loaded inside the hollow porous polymer microspheres. The mold-proof coating of the mold-proof refreshing corrugated paperboard can be used for restraining growth of mold in a package; on the premise that fruits and vegetables are not pretreated, the fruits and vegetables can be prevented from molding, the refreshing coating can be used for effectively removing ethylene, meanwhile, the photosynthesis of the fruits and vegetables are not influenced, the preservation effect is enhanced, and the preservation time is prolonged.

The invention provides a preparation method of ceramic powder for food preservation. The preparation method includes the steps that [1] natural zeolite is crushed, the crushed natural zeolite is subjected to heat treatment at a certain temperature for 6 hours, and then, the heat-treated natural zeolite is added into an aqueous solution to prepare a zeolite aqueous solution; [2] shellfishes are calcined at 350 DEG C, 750 DEG C and 840 DEG C, respectively, so as to obtain shellfish powder; and [3] the calcined shellfish powder is added into the zeolite aqueous solution, mixing is performed, heating is performed while the water is heated at the temperature of 90-100 DEG C, finally, a certain temperature is maintained until the water content of the powder is 5%, and finally the ceramic powder is obtained. The fresh-keeping effect on fresh and vegetables and fruits can be achieved, and the product prepared by the method can adsorb and remove heavy metals and organic matters; meanwhile, mineral components which are useful for the human body are dissolved in water to obtain positive ions through decomposing, safe and cost-effective fresh-keeping and antibacterial effects can be achieved, and the effective fresh-keeping effect lasts for a long time.

The invention discloses a preparation process of a green environmentally-friendly high-adsorption-active adsorbent for printing and dyeing wastewater. The process comprises the following steps: mixingfly ash, bentonite and concentrated sulfuric acid, stirring, filtering, washing, drying, adding beta-type hemihydrate gypsum, manganese oxide and iron oxide, and uniformly mixing to obtain a fly ashcomposite; mixing carbon nanotubes and spherical alumina, stirring uniformly, adding an ethanol solution, stirring, adding microcrystalline cellulose, stirring, and washing to obtain a carbon nanotubecomposite; mixing sodium hexametaphosphate and water uniformly, adding the fly ash composite and the carbon nanotube composite, uniformly mixing, sending into a mold, drying in an oven, demolding, sending a molded blank body into a muffle furnace for roasting, and cooling to obtain the green environmentally-friendly high-adsorption-active adsorbent for the printing and dyeing wastewater. The preparation process is basically non-polluting, green and environmentally friendly, a product is not easy to loose in the adsorption process, the adsorption activity is high, adsorbed materials not only includes dyes in the printing and dyeing wastewater, but also includes some metal ions, the adsorption effect is better, and the problem of decolorization of the printing and dyeing wastewater is solved.

The invention belongs to the technical field of coatings, and particularly relates to an inorganic fireproof coating and a preparation method thereof. The inorganic fireproof coating comprises the following components in parts by weight: 10-20 parts of potassium silicate; 20-35 parts of an odorless emulsion; 20-35 parts of an anti-formaldehyde emulsion; 2-4 parts of a formaldehyde removal auxiliary agent; 40-50 parts of pigment / filler; 4-5 parts of a coalescing agent; 0.3-1 part of a rheological additive; 1-5 parts of other auxiliary agents; and 18-25 parts of water. The inorganic fireproof coating disclosed by the invention has excellent fireproof, odor-free and formaldehyde-resistant properties, is green and environment-friendly, meets the increasingly pursuit of the market for health and environmental protection, and is wide in application range.

The invention discloses an open type ventilation system. The open type ventilation system comprises an air inlet unit, a ceiling unit and an air exhaust unit; the air inlet unit is arranged on a wallbody above the ceiling unit, and the air inlet unit is used for realizing the operation of inputting outdoor gas into a room; the ceiling unit comprises a keel framework and a formaldehyde purification plate, the formaldehyde purification plate is connected with the keel framework, and the ceiling unit is used for realizing the filtration operation of the gas; and the air exhaust unit is arrangedon a wall body below the ceiling unit and is arranged in a mode of being away from the air inlet unit, and the air exhaust unit is used for realizing the operation of exhausting indoor gas to the outside of the room. The open type ventilation system can be applied to the technical field of ventilation, can effectively overcome the defects in the prior art, and can solve the problem of the air quality in all directions and furthermore, the working efficiency of the ventilation system can be effectively improved.

The invention discloses micro-nano composite particles and a preparation process thereof. The micro-nano composite particles are characterized in that nano and sub-nano particles with diameters smaller than micropore diameters of the porous micro-nano particles are inserted into the porous micro-nano particles to form three-dimensional porous and / or spiny micro-nano composite particles; the single-pore embedding quantity of the three-dimensional porous and / or spiny micro-nano composite particles is 1%-100% of the pore volume. The high-speed airflow kinetic energy embedding preparation processis easy to operate, and the prepared micro-nano composite particles have good dispersibility, are not easy to agglomerate, and can be applied to polymers and polymer products. The micro-nano compositeparticles have good reinforcement effect in rubber and rubber products, show excellent mechanical properties, and show synergistic promotion effect of reinforcement, low heat generation and wet skidresistance in tire rubber.