879results about How to "Easy to separate and recycle" patented technology

A laser cutting device, comprising a material feeding means for feeding a sheet-like material in a feeding direction, a processing head capable of radiating laser beam toward the material, a head moving means for moving the processing head in a material feeding direction X and a material lateral direction Y, an upstream side support means (belt conveyor mechanism F) for supporting the material on the upstream side of the lower part of the processing head and increasing / decreasing the support area (R2) of the material in the feeding direction according to the movement of the processing head in the feeding direction, and a downstream side support means (belt conveyor mechanism E) for supporting a part cut on the processing side lower part of the processing head and increasing / decreasing the support area (R1) of the cut part in the feeding direction according to the movement of the processing head in the feeding direction.

Sets of communications resources, e.g., sets of peer discovery resources, in a peer to peer communications system may be use concurrently by multiple transmitting devices. The communications system supports a plurality of different pilot sequences. Multiple transmitting devices may transmit their signals on the same set of communications resources, but with different pilot sequences. This approach allows receiving devices to distinguish between multiple signal sources, e.g., wireless terminals, using a shared communications resource. A wireless communications device monitors a plurality of different sets of communications resources and selects, e.g., based on received energy levels, a set of communications resources from said plurality of different sets of communications resources to use for communication. The communications device further selects one of a plurality of different pilot sequences to use for said communication and transmits pilot signals using the selected pilot sequence and at least a portion of the selected set of communications resources.

The metal oxide catalyst for urea alcoholysis process of synthesizing methyl carbonate consists of 1-3 kinds oxides of Li, Mg, Ni, Zn, Pb, Al, Fe, Mo, Zr and La, and has ZnO as main component accounting for 35-95 wt%. When it consists of three kinds of metal oxide, the other two except ZnO have the same weight percentage. It is prepared through thermal decomposition process, precipitation process, or coprecipitation process. The catalyst is easy to prepare, separate, recover and regenerate, and has high catalytic activity for urea alcoholysis process of synthesizing methyl carbonate, yield up to 49.7%, no corrosion of equipment and no environmental pollution.

The present invention provides a preparation of a chitosan compound adsorbent for absorbing magnetic powder heavy metal ion imprint. The chitosan is employed as a imprinting matrix material, the nanometer magnetic powder Fe3O4 is employed as a magnetic component, the epichlorohydrin is employed as a crosslinking agent, the sodium tripolyphosphate is employed as a curing agent, after steps of ion imprinting, magnetic powder embedding and curing and template ion eliminating, the magnetic metal ion imprinting chitosan compound adsorbent is obtained. The compound absorbent prepared by the present invention can be separated from the solution after absorption efficiently and rapidly under the external magnetic field to realize the rapid efficient reclaim of the adsorbent. The compound absorbent has high mechanical strength and selective absorbability of imprint Cr(VI) or Zn (II), avoids the swelling loss of the chitosan in acidity solution and improves the absorption capacity of Cr(VI) or Zn (II). The preparation of the present invention has simple reaction conditions and has no rigorous limit of the experiment conditions. The preparation of the present invention can be used to process the heavy metal waste water containing Cr(VI) or Zn (II), also reclaim Cr(VI) or Zn (II).

The invention discloses a method for synthesizing polyol fatty acid ester. The method comprises: fatty acid and polyol are used as reactants; functionalized ionic liquid is used as catalyst; under operational conditions of normal pressure, a reaction temperature of between 80 and 200 DEG C and reaction time of between 0.5 and 8 hours, the polyol fatty acid ester is synthesized. The method has the advantages of simple working procedure, mild reaction condition, high esterification rate, good stability of the catalyst and recyclability.

The invention relates to a method for flotation of rare earth from Baiyunebo tailings and belongs to the field of ore dressing. The method is characterized by adopting the following steps: firstly, performing ore grinding on the Baiyunebo tailings till the tailings in the particle size of -200 meshes account for above 95%; then performing pulp mixing and flotation on the tailings subjected to the ore grinding, wherein the flotation comprises rougher flotation, concentration and scavenging, and the series of the flotation is determined according to the grade of the rare earth in the tailings and the final requirements on the grade of rare earth concentrate; and sequentially returning middlings generated by the flotation to the upper stage of the flotation. The adopted reagent system is as follows: water glass is taken as an inhibitor, a hydroxamic acid type collector is taken as the collector, and No.2 oil or No. 318 oil is taken as a foaming agent. The method is simple, the production cost is low, the pollution is avoided, the recovery rate of the rare earth is high, the finally obtained tailings can also be used as the raw material for separating other minerals and the comprehensive utilization of resources is realized.

The invention discloses a preparation method of a magnetic antiphase demulsifier. The preparation method is characterized by firstly, preparing monodisperse ferroferric oxide magnetic microspheres by a hydrothermal method; secondly, coating a layer of thin silicon dioxide on the surfaces of the monodisperse ferroferric oxide magnetic microspheres, synthesizing magnetic microspheres with nuclear shell structures, performing group functional modification on the nuclear shell magnetic microspheres by using a silane coupling agent KH560; at last, performing grafting reaction by using the activity of functional groups and an antiphase demulsifier to obtain the magnetic antiphase demulsifier; the magnetic antiphase demulsifier prepared by the preparation method can improve the efficiency of original antiphase demulsifiers and has the characteristics of easy separation, high oil removing rate, obvious separation effect to oil-containing sewage, little use amount and high efficiency.

The invention discloses a ZnSn (OH)6 nanometer cubic particle / graphene sandwich structure compound light catalyst and a preparation method and application thereof. The ZnSn (OH)6 nanometer cubic particle / graphene sandwich structure compound material is prepared by compounding oxidized graphene and ZnSn (OH)6 nanometer cubic particles through auxiliary reduction of ultraviolet light. The preparation method of the ZnSn (OH)6 nanometer cubic particles is simple in process, convenient to operate, environment-friendly, efficient in synthesis and low in cost. The catalyst of the composite material is firmly bonded with the surface of graphene, separation of photon-generated carriers can be effectively improved and the recombination rate of carriers can be lowered to show a photocatalytic performance superior to nano particles. The photocatalytic activity of the compound light catalyst is 1.94 times of pure ZnSn (OH)6 and 1.74 times of commercial P25. The light catalyst is easy to separate from waste water and suitable for industrial production and application.

The invention belongs to the technical field of solid waste treatment and resource recovery, and relates to an apparatus for pyrolyzing solid wastes through molten salt, and a method thereof. The method uses the molten salt as a pyrolysis medium, the solid wastes are immersed in the molten salt and are effectively dissociated and decomposed under preset pyrolysis conditions, and various resource substances can be recovered. Pyrolysis products of organic components in the solid wastes are recycled as energy and resource substances. The method has the advantages of short process flow and simple operation. The apparatus allows the above raw material to be sent into or moved out of a molten salt reactor through a pyrolysis basket, and comprises a gas inlet, a gas outlet, and a feeding and discharging gate. The method uses the high heat accumulation capability and high heat conduction rate of the molten salt, effectively improves the decomposition rate of organic matters and the energy utilization rate, traps or converts acidic gases and harmful substances by using the characteristic of reaction of the molten salt with the acidic gases and the harmful substances, reduces secondary pollution to environment, and improves the cleanliness and resource of products.

The invention provides a method of applying a low metal loading catalyst for preparing glycol and propylene glycol from carbohydrate, including cellulose, starch, semi-cellulose, cane sugar, glucose, fructose, fructosan, xylose, and soluble xylo oligosaccharide. In the method, carbohydrate is taken as the raw material, the compound catalyst is composed of catalytic active components selected from one or more components from following components: highly-disperse and low-loading ruthenium, inorganic compounds, organic compounds, and complex of tungsten, or simple substance tungsten, then one-step catalytic conversion process is carried out under the hydrothermal conditions: temperature of 60 to 350 DEG C, and hydrogen pressure 0.1 to 15 MPa, and the high-efficient, high-selective and high yield preparation of glycol and propylene glycol from carbohydrate is achieved. The method takes highly-disperse and high stability low loading Ru-based catalyst as the reaction catalyst, so the usage amount of value metals is reduced, the loss of catalyst carrier is slowed down, and the recycle rate of Ru-base catalyst is increased. The catalyst has the prominent advantages of high activity, high selectivity, and very high cyclicity. Compared to other technologies, which prepare polyol from carbohydrate, the method has the advantages of simple reaction process, high efficiency, good stability of catalyst, and multi-circulation, and has very vast industrial application value.

The invention provides an acidified mixed crystal TiO2 nanowire loaded photocatalyst. The photocatalyst is prepared by using the following method: dispersing titanium dioxide P25 in a NaOH aqueous solution, carrying out hydrothermal reaction on the obtained mixture, and after the reaction is completed, filtering out precipitates; putting the precipitates into a hydrochloric acid solution, carrying out impregnation acidification, washing the precipitates by using deionized water, drying the precipitates in a vacuum drying oven, and putting the precipitates into a muffle furnace and calcining for 2-8h at the temperature of 500-600 DEG C so as to obtain a mixed crystal TiO2 nanowire; adding the mixed crystal TiO2 nanowire and transition metal salt into an ethanol aqueous solution, dropwise adding a sulfuric acid aqueous solution, soaking and stirring, carrying out a hydrothermal reaction, and after the reaction is completed, removing liquid supernatant; and carrying out vacuum drying on the obtained object so as to obtain the photocatalyst. The photocatalyst can be applied to the visible light catalytic oxidation reaction of industrial organic wastewater, and is high in catalytic activity, good in stability, economical and efficient.

The invention provides a preparation method of a magnetic imprinting composite photocatalyst with good light transmission, belonging to the technical field of preparation of environmental materials. The method comprises using magnetic Fe3O4 nanoparticles as carriers, coating SiO2 insulating layers on surfaces of the nanoparticles, using a sol-gel technology to prepare a TiO2@SiO2@Fe3O4 photocatalyst, using polyethylene glycol to treat surface of the photocatalyst, and using modified TiO2@SiO2@Fe3O4 as a base material, enrofloxacin hydrochloride as a template molecule, methyl methacrylate as an imprinting functional monomer, styrene as a polymerization monomer, trimethylol propane trimethacrylate as a cross-linking agent, azodiisobutyronitrile as an initiator and a mixed solution of dimethyl sulphoxide and water as solvents to prepare the magnetic imprinting composite photocatalyst with the good light transmission. The invention is advantageous in that a magnetic separation characteristic of the photocatalyst enables separation and recovery of samples to be relatively convenient and high-efficiency.

The invention discloses a modified magnetic sludge biological carbon and a preparation method and applications thereof. The modified magnetic sludge biological carbon is prepared by carbonizing residual sludge, modifying sludge by alkali, and modifying sludge by acid. The provided modified magnetic sludge biological carbon has the advantages of good magnetic property, large specific surface and pore volume, abundant pore structure, many surface adsorption functional groups and adsorption sites, and strong performance on removing target pollutants; and the preparation method has the advantages of simple preparation, easy operation, low cost, high production efficiency, and convenience for large scale production. The provided modified magnetic sludge biological carbon is used to remove tetracycline hydrochloride in water for the first time, has the advantages of large adsorption amount, strong adsorption performance, high adsorption efficiency, simple and convenient operation, short processing period, low processing cost, and easy separation and recovery, and has a strong performance on removing tetracycline hydrochloride. The maximal balance adsorption amount can reach 253.8 mg / g. The performance of the biological carbon is obviously stronger than that of unmodified magnetic sludge biological carbon.

The invention provides TiO2 / RGO aerogel, and a preparation method and application of the TiO2 / RGO aerogel, belonging to the technical fields of material preparation and environment purification. By adopting L-Cysteine as a reducing agent and a crosslinking agent, the TiO2 / RGO aerogel is prepared by loading TiO2 onto ROG aerogel by a simple one-step hydrothermal method for the first time, and the TiO2 / RGO aerogel has a macrostructure of which the diameter is 2.0cm and the height is 3.5mm. The prepared aerogel has high specific surface area, can efficiently adsorb oily wastewater and treat the oily wastewater in a photocatalysis manner, and is easy to separate and recycle. The preparation method is simple, is beneficial to large-scale industrial production, and has significant economic benefits and social benefits, and raw materials are cheap and easily available.

The invention relates to a preparation method of coal-based magnetic activated carbon and the coal-based magnetic activated carbon. The preparation method of the coal-based magnetic activated carbon comprises the following steps of: placing deashing coal dust and dodecyl sodium sulfate into a ferric chloride solution, sufficiently mixing, and then standing for adsorption; then adding ammonia water and a sodium hydroxide solution or a potassium hydroxide solution, sufficiently stirring, and then standing for transforming ferric chloride into ferric hydroxide; filtering and drying solid-phase materials to obtain a mixture of deashing coal and the ferric hydroxide, i.e. a precursor of the coal-based magnetic activated carbon; sufficiently mixing the precursor with activating agents, i.e. potassium hydroxide or sodium hydroxide, adding distilled water to stir into paste, and warming for carbonization under the protection of nitrogen; and heating and activating under the protection of the nitrogen. The obtained coal-based magnetic activated carbon has difficult blockage of pores because a magnet exists in a state of Fe3C, thereby having higher saturation and magnetization intensity and larger specific surface area. The invention has the advantages of extensive source of coal raw materials, low cost, simple preparation process and easy separation and recovery of the coal-based magnetic activated carbon.

The invention discloses a method for synthesizing 2,5-dihydroxymethylfuran by selective hydrogenation of 5-hydroxymethylfurfural. The method is characterized in that a magnetic metal-organic coordination polymer is used as an acid and base bifunctional catalyst, low-price and easily-obtained low carbon alcohol is used as an in-situ hydrogen donor, and the 5-hydroxymethylfurfural is efficiently transformed into the 2,5-dihydroxymethylfuran by a selective transfer hydrogenation reaction under mild operation conditions and the maximum yield of the 2,5-dihydroxymethylfuran can be up to 98.6 percent. The magnetic metal organic coordination polymer used in the method disclosed by the invention has the advantages of relatively-high acid-base strength, more acid-base sites, relatively-large specific surface area and suitable pore size; in addition, the magnetic metal organic coordination polymer is simple in preparation process, is easy to separate and recover and shows excellent catalytic activity and catalytic stability. Furthermore, the low carbon alcohol is used as the in-situ hydrogen donor in the invention, so that the use of molecular hydrogen is avoided and the safety of the reaction process is improved; besides, the low carbon alcohol can be used as a reaction solvent and the introduction of exogenous substances is reduced, and thereby the production cost can be further reduced.

The invention provides a method for preparing a gardenia red pigment by using an immobilized enzyme, which comprises the following steps of: using geniposide as a raw material; performing alkaline hydrolysis and acidification on the raw material, and adding the immobilized enzyme into the raw material to perform enzymolysis; filtering the mixture to obtain enzymolysis solution; adding a primary amino compound into the enzymolysis into to perform a reaction; filtering the mixture to obtain solution of the gardenia red pigment; and performing acid deposition, deposition washing neutralization, dehydration and drying on the solution of the gardenia red pigment to obtain the gardenia red pigment. The method has the advantages that: an enzyme preparation can be recycled, the reaction condition is mild, an acid deposition method is adopted to perform enrichment, the process is simple, the energy consumption is low, and a product can be separated easily. The gardenia red pigment prepared by the method can obviously reduce the production cost. The product has the maximum absorption of 530 nm, has high water-solubility and high light, heat, acid, alkali and metal ion stability, and is favorable for widening the application range of the gardenia red pigment.

The invention discloses a preparation method and application of a beta-FeOOH-loaded graphene oxide catalyst. The preparation method comprises the following steps: dispersing graphene oxide in water, carrying out ultrasonic treatment so as to obtain uniform dispersion liquid of graphene oxide, then adding ferric trichloride into the dispersion liquid of graphene oxide, carrying out heating in a constant-temperature water-bath so as to load beta-FeOOH onto the surface of graphene oxide and subjecting the obtained product to centrifugation, washing and drying so as to obtain the nanometer beta-FeOOH-loaded graphene oxide catalyst. The catalyst and hydrogen peroxide are added into a dye water body with a certain concentration; and under illumination of visible light, dye chroma is removed, biotoxicity is reduce, and the water body is purified. The catalyst is free of secondary pollution, and an intermediate produced in the reaction has obvious reduced biotoxicity; reaction conditions are mild, and the reaction can be carried out under the condition of visible light; process flow is simple in operation; raw materials used for preparation of the catalyst are easily available; the reacted solid phase catalyst is easy to separate; so the catalyst has good application prospects in the field of water pollution treatment.

The invention discloses a high-adsorption porous carbon supported zero-valent iron catalyst as well as a preparation method and an application thereof and provides a new catalyst for an adsorbing andactivating oxidizing agent to decompose organic pollutants in soil and water. With high polymer and biomass as carbon sources, a compound catalyst with zero-valent iron supported in a porous carbon framework in a high-dispersion manner is prepared with a carbon thermal reduction one-step method. According to the prepared porous carbon supported zero-valent iron catalyst, nano zero-valent iron particles are uniformly distributed in the porous carbon framework, and the catalyst has a high specific surface area (500-1,000 m<2> / g) and large pore volume (0.3-0.7 cm<3> / g) and is magnetic. The preparation method of the catalyst can be used for batch production. The prepared catalyst can rapidly and massively adsorb organic pollutants, activate persulfate, hydrogen peroxide and other strong oxidizers, has the reaction activity higher than that of bivalent iron salt and imported commercial zero-valent iron and has broad application prospects in decomposing persistent organic pollutants in waterand soil.

The invention discloses a preparation method of a magnetic biochar adsorbing material for arsenic-cadmium combined pollution remediation. The preparation method comprises the following steps: 1) drying and smashing plant straw as biomass; 2) dissolving ferrous compound and ferric compound into water to obtain ferric salt solution according to a molar ratio of ferric ion to ferrous iron as (1.8 to 2.2) to 1; firstly adjusting a pH value of the ferric salt solution to 11 to 12, then adding the biomass obtained in the step 1), stirring at temperature of 60 + / - 10 DEG C for 2 + / -0.5 hours and finally standing for 22 to 26 hours under a sealed condition, wherein solid-fluid weight ratio of the biomass to the ferric salt solution is 4.5 to 5.5%; 3) drying solid obtained in the step 2), adding calcium carbonate powder of 0.8 to 1.2% of the weight of dried solid and pyrolyzing in 400 + / - 50 DEG C for 2 + / - 0.5 hours under inert gas atmosphere to obtain the magnetic biochar material.

The invention belongs to the technical field of zeolite materials, in particular to a method for synthesizing ZSM-5 zeolite orderly accumulated by nanometer crystallite. The method comprises the following steps: adding MFI type zeolite seed crystal in a common ZSM-5 zeolite synthesizing solution; and synthesizing the ZSM-5 zeolite with multistage pore canals and controllable granular size by modulating the synthesizing ration, reaction condition or adding additives. In the invention, the ZSM-5 zeolite is an assembly body of a class of single crystals, which is grown by orderly packing seed crystals by ZSM-5 zeolite crystallite, has small granular and a multistage pore canal structure, larger surface area, shorter mass transfer route, good stability, and can be used for reactions for diffusion control or the surface activity site control. The method has short hydro-thermal treatment time, high crystallinity and yield and the like, and is convenient to separate the ZSM-5 zeolite.

This invention involves magnetic solid base catalyst, its components including magnetic material and metal oxide or magnetic vector with a mixture of metal salt as a catalyst, activity group is alkali metal salts. Their preparation methods: magnetic material and metal oxide or metal salts fully mixed grinding and dispersed evenly to join the binder, and then roasted and insulation, get a magnetic catalyst carrier; put active component into deionized water prepared impregnating solution; Magnetic catalyst carrier parked in the above impregnated solution to response, static aging, drying, calcination and insulation, then get a magnetic solid base catalyst. The invention magnetic solid base catalyst production process is simple, low cost, used for the preparation of the bio-diesel in transesterification reaction, catalytic function is superior, separation and recovery is convenient after transesterification reaction.

The invention discloses a compound heavy metal adsorbent. The compound soil heavy metal adsorbent comprises a floating core and a compound high molecule coating the floating core, wherein the mass ratio of the floating core to the compound high molecule is (1-5):1; the compound high molecule comprises a first polymer and a second polymer of which the mass ratio is (5:1)-(1:5); the first polymer is alginic acid or calcium alginate; the second polymer is modified chitosan; a modification group of the modified chitosan is small molecule chelator; the small molecule chelator has a carboxyl group and at least two chelation groups; the amino group ratio of the small molecule chelator substituted chitosan is above 30%; and the remaining amino groups in the chitosan and hydroxyl groups of the first polymer are crosslinked through dialdehyde molecules. According to the invention, the soil heavy metal adsorbent is prepared by compounding the modified chitosan modified with the small molecule chelator with the alginic acid / calcium alginate and the floating core, thereby improving the adsorbability of the soil heavy metal adsorbent.

The invention relates to a magnetic graphene enzyme-mimicking property-based acetylcholine visual-detection method, belonging to the technical field of biosensing. A hydrothermal method is used for synthesizing Fe3O4 / rGO by one step, H2O2 (hydrogen peroxide) is catalyzed to oxidize a substrate TMB (tetramethylabenzidine) to generate blue by utilizing the peroxidase-like property of the Fe3O4 / rGO, and the characteristic absorption intensity of an oxidation product of the TMB at the wavelength of 652nm is detected to realize the detection of hydrogen peroxide; furthermore, the H2O2 can be catalyzed to oxidize and convert the colorless TMB into a corresponding blue product based on the Fe3O4 / rGO, and the blue product is combined with acetyl choline to decompose H2O2 in the presence of both acetylcholinesterase and choline oxidase, and a novel acetylcholine visual-sensing method is established. The invention aims to provide an acetylcholine colorimetric detection method, and according to the method, the operation is convenient and flexible, the detection cost is low, the sensitivity is high, and instruments and equipment are simple.

The invention relates to treatment of oil-field oily sludge and particularly relates to a treatment method of recycling oil-field oily sludge. A treatment device comprises a waste oil sludge lifting device, a vibrating sieve, an extracting tank, a three-phase separating tank, a distillation tower, and an electrical floating and filtering device; a treatment method comprises steps of mechanical sieving, solvent extracting, three-phase separating, solvent recycling and oil residue treating. According to the method, the extracting method is the water-assisted solvent extracting process, so that the extraction is relatively sufficient and the later-stage phase separating and recycling are relatively facilitated; a solvent can be recycled, and assisted water can be recycled after electrical floating and filtering treatment, so that secondary pollution is not caused, mud residue can be effectively utilized after biological treatment, and therefore, a waste oily sludge resource is sufficiently utilized, petrol resources are saved, environmental pollution is eliminated, and economic and social benefits are generated.

The invention discloses a method and product for loading a semiconductor photocatalyst on the surface of an electrospun fiber. The method comprises the following steps: (1) preparing an electrospinning template fiber material; (2) preparing a reaction solution for synthesizing the semiconductor photocatalyst through a hydro-thermal method; (3) soaking the template fiber material obtained in the step (1) in the reaction solution obtained in the step (2), putting the reaction solution with the template fiber material in a closed hydro-thermal kettle to perform a hydro-thermal reaction, and synthesizing a nano semiconductor photocatalyst on a fiber surface of the template fiber material through the hydro-thermal method; and (4) performing cleaning and drying. The method is easy to operate, and can realize large-scale production, and an obtained product is a flexible material which is difficult to damage and high in photocatalytic efficiency, can be separated and recovered easily after use, and can be reused.

The invention relates to a kind of Mg-Al hydrotalcite loaded bimetallic nano-catalyst and its preparation method, and relates to application of the catalyst system in oxidation of alcohol into corresponding carbonyl compounds. The catalyst preparation method consists of: 1) preparing an Mg-Al hydrotalcite carrier through a urea decomposition method; 2) loading the precursors of metal Pd and Au on the Mg-Al hydrotalcite surface; and 3) then reducing Pd (II) and Au (III) through NaBH4, thus obtaining the bimetallic nanometer particle catalyst. The catalyst provided in the invention has the advantages of high catalytic activity, good stability, separability, and easy recovery, thus being applicable to alcohol oxidation reactions in aqueous phases.

The invention discloses a preparation method of separating a zinc oxide-based photocatalyst by magnetic control, which comprises the following steps: preparing a magnetic material, then using the preparative magnetic material as a core to prepare the core-shell photocatalyst capable of separating by magnetic control. According to the invention, the photocatalyst enables easy separation and recovery through an external magnetic field, the method for the photocatalyst by magnetic control has the advantages of simple process and small operation difficulty, the prepared photocatalyst has the advantages of high activity, table performance and strong practicality, and possesses strong popularization and application value. Compared with a ZnO photocatalyst prepared by the same method, the catalytic activity of the photocatalyst of the invention is enhanced, the external magnetic field enables easy separation and recovery, and the preparation technology is simple. According to the composite photocatalysis material prepared by the magnetic material and ZnO, compared with simple ZnO, the photocatalysis effect is maintained after 3 times circular usage, and the practical usage cost can be substantially reduced on certain degree.

The invention relates to the technical field of nano material preparation and energy environmental protection, in particular to high-performance micro-nano multilevel-structure MoS2 material and a preparation method thereof. The preparation method is characterized in that nonionic surfactant polyglycol is introduced to allow MoS2 super-thin nano sheets generated by reaction to self-assemble into nano-sphere units, the nano-sphere units further assemble to form microspheres with a micro-nano multilevel structure, the microspheres are 2-10 micrometers in diameter, the nano-spheres are 50-200 nanometers in diameter, the nano sheets are 100-300 nanometers in length, 100-300 nanometers in width and 2-50 nanometers in thickness, the nano-sphere units interweave to form the microspheres, and the specific surface area of the microspheres is 10-100m<2> / g. The MoS2 material can bring the advantages of high activity and high efficiency of nano units into play. The preparation method completed in one step under a hydrothermal condition is simple in process, low in energy consumption and cost, short in preparation cycle, environmental friendly, beneficial to engineering large-scale preparation and application, and the like.

The invention relates to a polyvinyl-imidazole-supported cobalt carbonyl catalyst, a preparation method and an application of the catalyst. The raw materials comprise a high-molecular compound containing imidazole groups and cobalt carbonyl, and the catalyst is used to catalyze an alkoxycarbonylation reaction of ethylene oxide to synthesize methyl 3-hydroxypropanoate. The method provided by the invention has the characteristics that the cobalt carbonyl which is used in the alkoxycarbonylation reaction of ethylene oxide is loaded on the PVI high-molecular compound containing imidazole groups through coordination, and the catalyst can be recycled and reused in the premise that the catalytic activity is not decreased. The polyvinyl-imidazole-supported cobalt carbonyl catalyst prepared by the method has the advantages of simple preparation method, high stability, easiness for separation recovery and cyclic utilization after the reaction, and stable catalytic performance after repeated use for multiple times.