1187results about How to "Improve the coordination effect" patented technology

The invention relates to a system and a method for open intelligent management of a laboratory. The system comprises a server and a client, wherein the server comprises a university level platform node server and a plurality of college level platform node servers; the university level platform node server performs data communication with a university shared data base through a data communication module and a synchronous module, and performs data communication with the college level platform node servers through the data communication module; the client is connected with the server through a campus network inside a university and through the INTERNET outside the university; and the client comprises a laboratory management control system and an intelligent laboratory management system. The method comprises the management of experiments or experiment courses specified in a teaching program and the management of open experiments or equipment usage outside the teaching program. According to the invention, all-day open of the laboratory can be realized, and the working efficiency of laboratory management personnel can be greatly improved.

The invention provides a method for improving the quality of cut stems. The method comprises the following steps that (1) tobacco stems are washed and degraded; (2) moisture regain is conducted on the tobacco stems and the tobacco stems are stored; (3) the tobacco stems are expanded and pressed; (4) stem pieces are degraded and stored; (5) material adding is conducted on the stem pieces; (6) the stem pieces are dried; (7) the dried stem pieces are stored; (8) moisture regain is conducted on the dried stem pieces and the dried stem pieces are expanded and pressed; (9) the stem pieces are cut into shreds and materials are added; (10) the cut stems are expanded and dried. Cigarettes with the cut stems prepared through the method are clear in fragrance characteristic, the fragrance quality is good, the smoke state is improved, the fine and smooth performance is improved, the harmony is better, miscellaneous gases are reduced, the dry sensation is reduced, and taste is more comfortable.

The invention discloses an amidoxime spherical lignin chelate adsorbing resin and a preparation method thereof. A spherical lignin bead is prepared by adopting reversed-phase suspension polymerization techniques of programmed heating, crosslinking and solidification and taking concentrated pulping black liquor or concentrated pulping red liquor as a raw material. The spherical lignin bead is grafted with copolymerized acrylonitrile through further amidoxime to obtain the spherical lignin chelate adsorbing resin which has the grain-size average pore size of 5-150nm, the uniformity coefficient of not more than 1.30, the specific surface area of 30-480m<2> / g, the water content of 55-75%, the bulk density of 0.60-0.73g / ml, the bulk volume of 2.25-5.80ml / g, the amidoxime group content of 6.51-15.85mmol / g and the chelate adsorption capacity of 5-15 mmol / g. The method of the invention is simple for operation, has low production cost, is expected to be of value in the practical application to the enrichment recovery of noble metals and the extraction of uranium from seawater.

The invention discloses elastic anti-fouling outer wall paint with acid rain resistance. The outer wall paint comprises the following components in percentage by weight: 10 to 20 percent of water, 0.5 to 0.8 percent of acrylic ammonium salt dispersant, 20 to 26 percent of rutile type titanium white powder, 2 to 3 percent of kieselguhr, 8 to 15 percent of superfine barium sulfate, 1 to 2 percent of sericite powder, 40 to 50 percent of self-crosslinked elastic acrylic polymer latex, 3 to 5 percent of opaque covering polymer, 1 to 2 percent of anti-freezing agent, 1 to 2 percent of film-forming aid, 0.5 to 0.8 percent of mold-proof anti-algae agent, 1 to 3 percent of organic silicon waterproof agent and 0.5 to 1.5 percent of polyurethane associated thickener. The paint has the advantages of acid rain resistance, good anti-fouling performance, excellent elasticity, mold injury resistance, good storage stability and capability of repeatedly coating a paint film.

The invention discloses a coumarin-thiacalix [4] arene fluorescent reagent as well as a preparation method and an application thereof, which belong to the chemical field of organic synthesis and analysis. The invention prepares an excellent coumarin-thiacalix [4] arene derivative which can be used for respectively detecting performances of fluorine ions and zinc ions. The preparation method of the coumarin-thiacalix [4] arene fluorescent reagent comprises the following steps of: respectively connecting two coumarin fluorescent groups at the lower 1,3-site of the calixarene and connecting two methoxyl ethyl at the 2,4-site through step by step reaction by using coumarin-thiacalix [4] arene and 7-hydroxycoumarin as starting materials to prepare the coumarin-thiacalix [4] arene fluorescent reagent. Under a special medium condition, the compound can be used as a dual-functional fluorescent or colorimetric reagent for detecting micro fluorine ions and zinc ions with high sensitivity and high selectivity by utilizing fluorescence spectrum and ultraviolet absorption spectrum.

The invention discloses a microcapsule wrapping a solid sun-screening agent, a preparation method and application thereof. The microcapsule comprises the solid sun-screening agent and a natural polymer. The solid sun-screening agent is wrapped in the microcapsule formed by the natural polymer. The solid sun-screening agent is an inorganic ultraviolet screener, an organic ultraviolet adsorbent or a mixture of the inorganic ultraviolet screener and the organic ultraviolet adsorbent. The natural polymer is agar, agarose, cellulose, chitosan or a derivative thereof. The microcapsule provided by the invention can be used in cosmetic to effectively prevent the solid sun-screening agent from being decomposed, and the sun-screening agent is separated from skin, so that irritation to skin is reduced. Hydrophilic natural polymer can cover color, improve feel and enhance cooperation in cosmetic.

The invention provides a quantum dot ligand exchange method. The quantum dot ligand exchange method includes the following steps: providing sulfydryl short-chain carboxylic acid and long-chain alcohol, refluxing the sulfydryl short-chain carboxylic acid and the long-chain alcohol to allow esterification, and performing dehydration to form a sulfydryl long-chain ester, wherein the number of carbon atoms in the molecular structure of the sulfydryl short-chain carboxyl acid is smaller than or equal to 8, the molecular structure of the long-chain alcohol only contains hydroxyl functional groups, and the number of carbon atoms is larger than or equal to 8; providing a first quantum dot with an oil-soluble ligand, mixing the first quantum dot with the sulfydryl long-chain ester, and stirring the mixture for ligand exchange to obtain a second quantum dot taking the long-chain ester as a ligand; adding catalysts and deionized water into the second quantum dot to allow hydrolysis reaction to obtain a water-soluble quantum dot with a short-chain carboxylic ligand.

A preparation method for a Cu-based hydrogenation catalyst comprises the following steps: dissolving soluble copper salt into water, then adding a carrier into the solution, and uniformly loading a copper precursor on the surface of the carrier to obtain a precursor sample; mixing the precursor sample and ethanol to form a suspending liquid, coating the suspending liquid on the surface of a glass sheet, impulsing polyisocyanate into an MLD reaction cavity, then impulsing an M precursor to be subjected to monomolecular layer reaction on the sample surface in sequence to obtain a hybrid membrane coated copper precursor compound; conducting heat treatment on the compound in air to obtain a nanometer CuO-MOx compound, and then conducting reduction in the reducing atmosphere to obtain the Cu-MOx interface catalyst. The preparation method has the advantage that the Cu-MOx interface structure can be regulated and controlled.

The invention discloses a preparation method of a three-dimensional graphene oxide / polyethyleneimine / carboxymethyl cellulose composite material. The preparation method comprises the following steps: performing nucleophilic substitution of an amino group on a molecular chain of polyethyleneimine and a carboxyl group and an epoxy group on the surface of graphene oxide to prepare a graphene oxide / polyethyleneimine composite material, and then with glutaraldehyde as a coupling agent, further modifying the graphene oxide / polyethyleneimine by using carboxymethyl cellulose to obtain the three-dimensional graphene oxide / polyethyleneimine / carboxymethyl cellulose composite material. Through introduction of the carboxymethyl cellulose, the number of negatively charged oxygen-containing adsorption sites of the material is increased, and a three-dimensional spatial structure is formed, so that the adsorption performance is further improved. Under a weak acid condition, the three-dimensional graphene oxide / polyethyleneimine / carboxymethyl cellulose composite material has a very good Pb<2+> adsorbing effect, and the adsorption capacity of the three-dimensional graphene oxide / polyethyleneimine / carboxymethyl cellulose composite material is 34.6% higher than that of the graphene oxide / polyethyleneimine, so that the three-dimensional graphene oxide / polyethyleneimine / carboxymethyl cellulose composite material can be applied to heavy metal adsorption treatment.

The present invention belongs to the technical field of blockchains, and discloses a unified public transport accounting and transaction system based on a blockchain. The system is formed by a blockchain bottom layer service and an application layer. The blockchain bottom layer service comprises an account center module, a transaction generation module, an information storage module and a data access and management module, and the account center module is configured to establish an account main body and account authority or authorization; the transaction generation module is configured to establish an transaction information module; the information storage module is configured to store block information; and the data access and management module is used for data access, data analysis and other monitoring management. The application layer comprises an application layer light wallet and an application layer management tool. The unified public transport accounting and transaction system can achieve unification of the national public transport system account systems, users' accounts can be general throughout the country and the account information is conveniently checked; the public account information can be selectively published or fully published; and moreover, through adoption of the blockchain technology and multi-accounting nodes, the data safety and the data reliability canbe ensured.

The invention provides a preparation method and application of an anti-soil polymer. The prepared polymer is used as a dispersant for a hydraulic cementing agent and / or an aqueous dispersion for potential hydraulic cementing agent and has good anti-soil performance. The preparation method the anti-soil polymer comprises a step of subjecting polyether macromonomer A with a special structure, monomer B containing a phosphoric acid or phosphorous acid group, optional monomer D and aldehyde C to condensation polymerization so as to prepare the anti-soil polymer, wherein the monomer D is selected from the group consisting of phenol, aniline, p- / o-aminobezene solfonic acid, p- / o-hydroxybenzoic acid, p- / o-aminobenzoic acid, p- / o-hydroxyezene solfonic acid, p- / o-toluidine and p- / o-methylphenol, a mol ratio of the polyether macromonomer A to the monomer B to the monomer D is 1: (0.5-12): (0-8.0), and a mol ratio of the polyether macromonomer A to the monomer B and the monomer D is 1: (0.5-12.0).

The invention discloses a preparation method and an adsorption method of a Ni<2+> adsorbent. The method comprises the following steps: (1) with tetraethoxysilane as a silicon source and triblock copolymer (P123, EO20PO70EO20) as a template agent, synthesizing a silica-based mesoporous material SBA-15, and modifying the inner surface of the silica-based mesoporous material SBA-15 with 3-aminopropyl triethoxy silane (APTES) through an alkyl coupling method to obtain an amino functionalized silica-based mesoporous material NH2-SBA-15; (2) grafting amino acid onto NH2-SBA-15 by a post-transplantation method to obtain the amino acid modified silica-based mesoporous material, namely, the adsorbent; (3) regulating the pH value of the adsorbent to 3-5 by virtue of a water solution containing Ni<2+>, and feeding the adsorbent to adsorb Ni<2+> in a water body, wherein the mass ratio of the adsorbent to Ni<2+> in the water body is 5:1 to 8:1, the adsorption temperature is 20-30 DEG.C, and the adsorption time is 10-30 minutes. The adsorbent preparation method is high in operability and good in reproducibility, the obtained amino acid modified silica-based mesoporous material has a good removal effect for heavy metal ions, Ni<2+>, in a water body, the equilibrium adsorption capacity of the adsorbent reaches up to 60mg.g<-1> above, and thus the actual application value of the adsorbent is good.

The invention relates to a rare-earth organic coordination polymer, and a preparation method and application thereof. The rare-earth organic coordination polymer has the following chemical formula: {(bpy)[Re(ip)1.5(H2O)4]}n, wherein bpy is 4,4'-bipyridyl, ip is isophthalic acid divalent negative ions, Re is one or more of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sc, Y and the like,and n is degree of polymerization. A hydro (solvent)-thermal synthesis method is used for preparing the rare-earth organic coordination polymer, is environment-friendly and easy to operate, low in cost and high in yield, and is suitable for large-scale industrial production. The prepared rare-earth organic coordination polymer has the good application prospects in fields of luminescence, catalysis, adsorption, magnetism, ion exchange, high polymer material aids and the like.

The invention discloses a polyurea-polysiloxane organic-inorganic hybridized concrete biological pollution protection material and a preparation method thereof. The pollution protection material is composed of a surface protection material and a base protection material, wherein the surface protection material is composed of the following raw materials in parts by weight: polyaspartic acid ester modified polysiloxane, modified isocyanate, a biological growth inhibitor, a catalyst, a coupling agent, an anti-ageing agent, a filler and pigment; the base protection material is composed of the following raw materials in parts by weight: modified epoxy resin, an epoxy curing agent, an reactive diluent, a coupling agent, an anti-ageing agent and a filler. The pollution protection material is excellent in biological pollution imitation performance, has the characteristic of low surface energy and can prevent biofouling. Special elements in structure interior of the material can inhibit growth of ocean and fresh water creatures, thereby achieving the aim of preventing biological pollution.

The invention relates to a compound corrosion and scale inhibitor which comprises the following raw materials according to mass ratio: 15%-30% of organic phosphonic acid, 10%-20% of acrylic acid or acrylic acid copolymer, 2%-10% of poly-maleic acid, 1%-3% of azole ramifications, 15%-30% of multivariate organic sulfonate, 2%-6% of dimethyl formamide and 20%-35% of water. The compound corrosion and scale inhibitor of the invention is used for a system which employs normal water as circulating cooling water, so as to solve corrosion problem caused by circulating water of normal-water to equipment. Corrosion rate of copper product is lower than the national standard of 0.005mm / a, thereby generating no equipment scaling caused by calcium phosphate deposition. Compared with corrosion inhibitors of the same kind, the compound corrosion and scale inhibitor has a lower dosage and is effective in corrosion and scale inhibiting. The compound corrosion and scale inhibitor is simple in operation, convenient, quick, safe and efficient.

The invention discloses a preparation method of a dual-functional electrocatalyst with a hollow polyhedral nano-cage microstructure doped with carbon material loading alloy, belonging to the field ofzinc Air Battery Catalyst Technology. The technical scheme of the invention mainly comprises the following steps of: adding an alcohol solution of cobalt nitrate and 2-Polyhedral ZIF- 67 precursor Wassynthesized by the reaction of methimidazole with ethanol at room temperature., and then that ZIF-67 precursor and that nickel source are heat and refluxed in an alcohol solvent to obtain hollow polyhedral nanocage product, and the obtained product is solvothermally react with the magnesium source and the boron source to obtain the target product. The catalyst of the invention introduces nickel and magnesium, so that the synergistic action between different components enhances the catalytic activity of the composite material, and the introduction of heteroatom boron effectively optimizes theelectronic structure of the material and improves the electrocatalytic performance. The catalyst of the invention and the preparation method thereof are prepared from zinc. The catalyst for air battery has a wide application prospect.

The invention provides a wet-type water-retaining property dustfall agent. The wet-type water-retaining property dustfall agent comprises, by weight, 0.2%-0.15% of starch grafting acrylate, 0.5%-2% of lauramidopropyl betaine, 0.01%-0.1% of cetyl trimethyl ammonium bromide, 0.2%-0.6% of sodium dodecyl sulfate, 0.3%-0.8% of sodium dodecyl benzene sulfonate, 0.1%-0.3% of sodium dodecyl sulfate, 0.4%-1.3% of sodium N-oleoyl-N-methyltaurinate, 0.02%-0.3% of dodecyl dimethyl betaine, 0.2%-0.6% of cocoanut fatty acid diethanolamide, 0.1%-1% of sooctyl alcohol sodium sulfate and the balance water. The wet-type water-retaining property dustfall agent is compressed by a hydraulic device and then forms mist spray to be sprayed to dust production points by nozzles, foam collides with dust particles in the air after being sprayed out, hence, high-concentration dust can be caught and settled, the surface tension of the water can be effectively lowered, the water spray can better wrap the dust, the high wetting water-retaining property is achieved, the dust concentration on an excavation working face can be effectively lowered, and the dust on the working face can be restrained for a long time.

The invention discloses an organic polymer heavy metal chelating flocculant as well as a preparation method and an application thereof. The organic polymer heavy metal chelating flocculant is prepared from the following raw materials in parts by weight: 100 parts of carboxymethyl starch, 5-20 parts of a crosslinking agent, 0.05-0.5 part of an initiator, 5-20 parts of acrylamide and 28-60 parts of carbon disulfide, wherein the crosslinking agent is adipic acid, phosphorus oxychloride or sodium trimetaphosphate. The organic polymer heavy metal chelating flocculant has the efficacies of both excellent heavy metal chelating precipitation and flocculation, has the advantages of rapidness in reaction speed, ideal effect of removing heavy metal ions, high treatment efficiency and the like, is low in dosage and cost and is capable of economically and efficiently treating sewage containing the heavy metal ions.

The invention discloses SiO2 / MoS2 core-shell-structure microspheres and a preparation method thereof. The method comprises the following steps: dissolving tetraethoxyl silicion and triethanolamine (or diethanolamine or ethylenediamine or 2-amino-2-methyl-1-propanol) in anhydrous ethanol, dropwisely adding distilled water, and carrying out hydrolysis reaction under certain conditions to prepare SiO2 microspheres; and dispersing the obtained SiO2 microspheres in a water solution containing ammonium molybdate, polyvinylpyrrolidone (K30) and sodium diethyldithiocarbamate, and carrying out hydrothermal reaction in a high-pressure autoclave to obtain the SiO2 / MoS2 core-shell microspheres. The SiO2 microspheres prepared by the method have uniform size; and the composite SiO2 / MoS2 core-shell microspheres have the advantages of uniform shape and size and favorable dispersity, and can be used for a lubricating oil additive to improve the lubricating conditions.

The invention relates to a method for cultivating cross rice. Wherein, it comprises that (1), selecting the light-temperature sensitive sterile system with low-temperature sterile or short-light low-temperature sterile; (2), selecting the sterile masculinity as gene system; (3), crossing sterile system S with sterile masculinity system S', to obtain stable sterile masculinity S / S' F1; (4), screening and recovering system R; (5), using S / S' F1 as mother type to be crossed with recover system R, to find the needed cross combination, to produce cross rice. The invention can improve the match property of sterile system and reduce produce cost.

The invention provides a low-relative-molecular-weight anti-clay type phosphate-based superplasticizer, and a preparation method and application thereof. The low-relative-molecular-weight anti-clay type phosphate-based superplasticizer has excellent anti-clay performance. The preparation method is easy to operate, mild in reaction conditions, capable of realizing industrial production and free ofenvironmental pollution. The preparation method comprises the following steps: (1) with polyamine of a specific structure as a starting agent, carrying out a ring opening reaction on epoxyalkane, andthen carrying out purifying to obtain a branched polyether polyamine intermediate with a terminal hydroxyl group; and (2) phosphorylating the terminal hydroxyl group of the branched polyether polyamine, and then carrying out purifying to obtain the low-relative-molecular-weight anti-clay type phosphate-based superplasticizer. The low-relative-molecular-weight anti-clay type phosphate-based superplasticizer has a molecular weight of 5, 000 to 14, 000.

The invention provides an application method of an aliphatics bis-hydroximic acid compound to mineral flotation, and belongs to the technical field of mineral flotation. The aliphatics bis-hydroximic acid compound is expressed as the formula I: FORMULA; and in the formula I, R is alkylene containing 1-20 carbon atoms. The aliphatics bis-hydroximic acid compound serves as a collecting agent for flotation of scheelite, wolframite, scheelite and wolframite mixed ore, tin ore and rare earth ore, can enhance a chelating effect on metal oxidation minerals, promotes absorption of the collecting agent on the surfaces of the minerals, has such characteristics as high collecting capacity, high selectivity and low ore ton quantity, and is suitable for treating difficult-selected fine grain ore.

The invention provides a solid polymer electrolyte doped with modified nanofiller and a preparation method of the solid polymer electrolyte and belongs to the technical field of solid polymer electrolyte materials. The novel solid polymer electrolyte doped with modified nanofiller is prepared by mixing dopamine coated silicon dioxide nanoparticles grafted with polyethylenimine on the surfaces, lithium salt, polyoxyethylene, polyethylenimine and an organic solvent capable of dissolving polyethylene oxide and then drying the mixture for film formation. The preparation method comprises the steps as follows: preparing the dopamine coated silicon dioxide nanoparticles, grafting the particles with polyethylenimine on the surfaces, preparing an electrolyte mixed solution and preparing an electrolyte film. The preparation technology is simple, high in efficiency and low in production cost, and the prepared solid polymer electrolyte for lithium ion batteries has better thermal stability and mechanical strength as well as excellent safety performance and has very bright market prospects.

The invention relates to a cigarette siraitia grosvenorii additive and a preparation method and application thereof. The preparation method comprises the following steps: first grinding fresh siraitia grosvenorii, using ethanol water solution to extract first ethanol extracting solution; using ethanol water solution to extract second ethanol extracting solution from raffinate; mixing the first ethanol extracting solution and the second ethanol extracting solution, then performing reduced pressure concentration to obtain siraitia grosvenorii extract, adopting the extract and amino acid and derivative thereof to perform a reaction and obtaining the cigarette siraitia grosvenorii additive. The quantity of aroma of tobacco products prepared with the cigarette siraitia grosvenorii additive of the invention is increased so as to reduce the irritation to the throat and increase the comfort level of cigarettes.

The invention discloses an ultra-small metal chalcogenide compound nano crystal and a biological synthesis method and application thereof. In one embodiment, the synthesis method is as follows: a protein with the isoelectric point PI lower than 9.0 and a metal salt are mixed with water evenly to form a mixed solution, the mixed solution is adjusted to alkaline, a reducing agent and a sulfur source are added for reaction to form the ultra-small metal chalcogenide compound nano crystal with the particle size less than 10nm. The method has the characteristics of mild reaction conditions, simple operation, direct use of particles without additional surface modification in biological photothermal therapy, and the like, the prepared ultra-small metal chalcogenide compound nano crystal is uniform in size, good in dispersion and high in stability, and the prepared ultra-small metal chalcogenide compound nano crystal has very good bio-compatibility without any surface modification, also has the photothermal effect, and is a great-application-prospect nano material used for photothermal therapy and biological fluorescence imaging.

The invention discloses a method for preparing compound biological activity sterilizing fluid, which comprises the steps: a proper amount of surface active agent is added to low molecular chitosan quaternary ammonium salt or low molecular chitosan solution under a stirring condition to be used as first fluid, povidone iodine is swelled to be used as second fluid, and the first fluid and the second fluid are evenly mixed according to a proper proportion and are regulated to a prescriptive range by a chemical reagent to obtain the compound biological activity sterilizing fluid. The prepared compound biological activity sterilizing fluid uses low molecular chitosan and povidone as double carriers, the chitosan not only can strengthen the bacterium inhibiting and sterilizing effects of the povidone iodine, but also has a certain adsorbing function for iodine released by the povidone iodine, causes the release of the iodine to be doubly controlled to reduce the volatilization of the iodine and increase the release uniformity of the iodine, the chitosan has degradability, the skin mucosa protecting function and the bacterium inhibiting function, therefore, the compound biological activity sterilizing fluid is stable and environmental-friendly and has high efficiency, low toxicity, low irritation and the skin protecting function.

The invention discloses a preparation method of a semi-interpenetrating network hydrogel film material for extracting uranium from seawater. The preparation method comprises the steps: dissolving polypropylene amidoxime, a monomer, a photoinitiator and a crosslinking agent at a certain mass ratio in an alkaline aqueous solution so as to obtain a precursor solution firstly, then injecting the precursor solution into a mold, and performing a polymerization reaction under ultraviolet light or sunlight so as to obtain the semi-interpenetrating network hydrogel film material. The preparation methodis simple and rapid, has low cost, and can be applied to large-scale production of the PAO semi-interpenetrating network hydrogel film material through low energy consumption and environment-friendlysunlight polymerization under the alkaline condition; and the material has a thickness of 0.2 mm, uniform micro-pore size, high adsorption efficiency, high selectivity and excellent mechanical properties, and can be reused multiple times.

The invention discloses compound biochar-based slow-release fertilizer and an application method thereof and mainly relates to the field of biochar-based fertilizer. A preparation method of the compound bio-carbon-based slow-release fertilizer comprises mixing agricultural rice straws and wood shavings, preparing char, adding sodium selenite into the char to obtain biochar, mixing pig manure and chicken manure, carrying out fermentation on the pig manure and chicken manure, carrying out metal passivation treatment to obtain manure-based fertilizer, further fermenting the biochar and the manure-based fertilizer, and adding diatomite into the fermentation product for modification to obtain slow release fertilizer granules. In use, preferably, the slow-release fertilizer granules are applied to the field according to a ratio of 256 kg per mu, and a field moisture capacity measured value is kept in a range of 70% to 80% in the whole growth period. The compound biochar-based slow-release fertilizer can meet the demand of nitrogen and phosphorus in the early stage and the whole period of rice seedling, has sufficient and lasting fertilizer effects, prevents the effects of heavy metals, improves the soil environment, inhibits methylmercury, and can produce high-yield good-quality selenium-rich rice.

The invention relates to an environment friendly oxidation type hydrophobic glucomannan adsorption material and a method for preparing the same, and belongs to the technical field of compositions containing glucomannan materials. The adsorption material comprises the following components in portion by weight: 20 to 100 portions of glucomannan, 50 to 500 portions of 0 to 70 percent glucomannan swelling inhibitor, 5 to 100 portions of alkali, 50 to 500 portions of water, and 1 to 20 portions of oxidizing agent. The preparation method comprises that: the glucomannan is swelled in an alkali mixed solvent of the swelling inhibitor, and subjected to acetyl group removing reaction for 1 to 40 hours at a temperature of between 35 and 90 DEG C; the mixed solution is filtered and washed so as to remove the swelling inhibitor and the excessive alkali, and the obtained product is dried at a temperature of between 50 and 100 DEG C for 8 to 24 hours to obtain the hydrophobic glucomannan; the hydrophobic glucomannan is swelled in water, the pH value is adjusted to be 3 to 12, and then the oxidizing agent is added to hydrophobic glucomannan and reacts for 1 to 24 hours; and the obtained mixed solution is filtered, washed and dried at a temperature of between 50 and 100 DEG C for 8 to 24 hours to obtain the oxidation type hydrophobic glucomannan adsorption material. The material has higher selective adsorption capability on heavy-metal ions and radioactive nuclides, and can be widely applied to the adsorption and separation of the heavy-metal ions and radioactive nuclides generated in mining, mining and metallurgy, chemical industry, electroplating, machinery, nuclear industry, environmental protection and restoration, and the like.

The invention relates to a preparation method of a oxygen reduction catalyst and aims to provide a preparation method of a macroporous carbon oxygen reduction catalyst containing sulfur, nitrogen and transition metal element. The method comprises the following steps: adding a thiourea solution into a glucose solution, dropwise adding hydrochloric acid in water bath, and reacting to obtain a glucose thiourea prepolymer solution; adding a suspension containing transition metal salt and a nano-CaCO3 powder into the solution, heating to react and spray-drying to obtain a catalyst precursor; heating to carry out deep polymerization and carbonization; and cooling, ball-milling, removing a template by the use of hydrochloric acid, rinsing and drying to obtain a product. The transition metal element is added before the formation of a porous material such that more catalytic centers can be formed and distribution of catalytic centers is more uniform. The catalyst has large specific surface area, good conductivity and high catalytic activity, and is especially suitable for high current working condition. A synthesized non-noble metal catalyst can be applied to various fuel cells and also can be used as a cathode catalyst of an air cell. Costs are low.