114results about How to "Mild and easy to control" patented technology

The invention relates to a lignocellulose acid / alkali coupling pretreatment method. Lignocellulose is separated into cellulose, hemicellulose and lignin by acid / alkali coupling pretreatment; and simultaneously, lignocellulose components are separated and subjected to high-efficiency enzymolysis and saccharification. The method comprises the steps of lignocellulose pretreatment, component separation, cellulose enzymolysis, solvent recovery and the like. The lignocellulose material is pretreated by formic acid or dilute sulphuric acid and is then subjected to solid-liquid separation, wherein the liquid component is used for recovering hemicellulose hydrolyzed sugar and part of lignin; and the solid component is further treated by ammonia water or a sodium hydroxide solution and is then subjected to solid-liquid separation, the liquid component is used for recovering lignin, and the solid component (cellulose) is subjected to enzymolysis and saccharification. By converting the lignocellulose into cellulose hydrolyzed sugar (glucose), hemicellulose hydrolyzed sugar (xylose and xylooligosaccharide) and lignin, the invention provides a basis for full-biomass utilization and develops a green process route for recovering the pretreatment solvent.

The invention discloses a preparation method of a porous Ti3C2 / g-C3N4 composite film material. The preparation method comprises following steps: Ti3C2 powder and g-C3N4 powder are prepared firstly, then the Ti3C2 powder and the g-C3N4 powder are mixed in a certain mass ratio and dispersed in a solution mixed by 100 ml of deionized water and isopropyl-ketone, an obtained mixed suspension is subjected to ultrasonic processing in nitrogen atmosphere at 45 DEG C for 6-10 h and then subjected to centrifugal treatment at the rotational speed of 3,000 r / min, unstripped aggregate is removed, a mixed solution with homogeneously dispersed Ti3C2 and g-C3N4 is reserved and filtered by a mixed cellulose ester filter membrane with the aperture of 0.05 mu m, the filter membrane is dried in vacuum at the room temperature for 20-30 h, substances on the mixed cellulose ester filter membrane are removed, and the Ti3C2 / g-C3N4 composite film material is obtained. Compared with the prior art, the prepared Ti3C2 / g-C3N4 composite film material has the advantages of flexibility, porosity and the like and can be applied to chemical synthesis of a catalyst, a hydrogen storage material and the like. The preparation method has the characteristics of simple operation, little pollution, mild and easily controlled conditions and easiness in implementation of industrial production.

Disclosed are a bionic bone repairing scaffold of a layered structure and a manufacturing method thereof. The scaffold is formed by at least one scaffold unit (4). The scaffold unit (4) is of a cylinder structure with a helical section, the cylinder structure is formed by continuously rolling a laminar material (2) tightly from inside to outside, and the diameter of the cylinder structure is from 0.1 mm to 50 mm. The structure is similar to the Harvard system of the natural bone, has a highly bionic effect, can well implement mechanical transfer between a defect site and normal bone tissue, can maintain good structure stability even in a degradation process, and completes the repair and function reconstruction of the bone tissue. The three-dimensional size of the bone repairing scaffold can be adjusted flexibly by controlling the thickness and height of the laminar material (2), and the number of rolling layers, so as to satisfy different use requirements.

The invention relates to a g-C3N4 supported cobalt oxide catalyst and a preparation method thereof. The preparation method comprises the following steps: preparing an aqueous solution of cobalt acetate and an aqueous solution of g-C3N4, mixing, and magnetically stirring to obtain a mixed solution A; adding ammonia water to the mixed solution A in a dropwise manner, and magnetically stirring to obtain a mixed solution B; adding the mixed solution B to an autoclave provided with a polytetrafluoroethylene liner, and carrying out a hydrothermal reaction at 130-160DEG C for 8-12h to obtain a mixture; and centrifuging the mixture, removing the obtained supernatant, washing the obtained residual solid substance, transferring the solid substance to an oven, and drying at 60DEG C for 8h to prepare the g-C3N4 supported cobalt oxide catalyst. The prepared catalyst can be used in catalysis of carbon monoxide low temperature oxidation, and can maintain complete conversion of carbon monoxide into carbon dioxide at 122DEG C for at least 2400min.

The invention relates to a method for preparing porous spherical stannous oxide nano material. The method comprises the steps of: slowly dripping a certain amount of prepared sodium hydroxide anhydrous ethanol solution into stannous chloride anhydrous ethanol solution, and stirring while dripping; after dripping, continuously stirring for 10-20min to obtain stannous oxide precursor liquid, wherein in the obtained stannous oxide precursor liquid, the molar concentration of dihydrated stannous chloride is controlled to be 0.125-0.25mol / L and the molar ratio between the dihydrated stannous chloride and sodium hydroxide is controlled to be 1: 2-1: 3.5; putting the prepared stannous oxide precursor liquid into a reaction kettle, wherein the filling degree is 80-90%; sealing the reaction kettle, and carrying out heat preservation on the reaction kettle in an electric constant temperature drying oven for 6-15h at the temperature of 130-170 DEG C; then naturally cooling the reaction kettle to room temperature; and carrying out centrifugation, washing and drying on the product to obtain gray black nano stannous oxide material. The method is simple in operation, mild in condition, easy in control of the condition, low in cost, less in pollution and easy for industrial production; and the prepared porous spherical stannous oxide nano material has the advantages of being even in morphology, high in component purity and the like.

The invention provides a simple preparation method of an indium oxide nano-cube. The method comprises the following steps of: selecting a quaternary micro-emulsion consisting of alkyl polyethenoxy ether as a nonionic surfactant, n-caprylic alcohol as a cosurfactant, cyclohexane and an In(NO3)3 aqueous solution, and intensely stirring the components on a magnetic mixer after the components which form the micro-emulsion are mixed to prepare a uniform and transparent invert In(NO3)3 micro-emulsion with stable property; dropwise adding the micro-emulsion containing In(NO3)3 into an NaOH aqueous solution, and keeping on stirring for 30 minutes; transferring the mixture into a 25mL reaction kettle lined with polytetrafluoroethylene; setting the reaction temperature and the reaction time, and naturally cooling to room temperature after a hydrothermal assistance reaction; centrifugally separating, and repeatedly washing with acetone, absolute ethanol and distilled water to obtain In(OH)3 white precipitate; and putting the In(OH)3 white precipitate into a muffle furnace for high-temperature calcining to prepare the indium oxide nano-cube with relatively uniform shape and size. By utilizingthe technical scheme of preparing the cubic indium oxide by a single micro-emulsion assistance hydrothermal method, the invention solves the problems that the traditional preparation method of the indium oxide cannot conveniently control the grain size of a product and has rigorous preparation conditions. The method provided by the invention has the characteristics of simple production process, safe production process, difficulty in agglomeration of the product and the like, and can be widely used for preparing a semi-conductor functional material.

The invention relates to a positive / negative (P / N) heterojunction based silicon / titanium dioxide three-dimensional composite material with synergic anti-reflection performance. The silicon / titanium three-dimensional composite material is prepared according to the following method of (1) firstly, carrying out anisotropic etching on a silicon wafer with an alkali liquid, and forming a closely-arranged square conical shape on the surface of the silicon wafer; (2) secondly, carrying out hydrophilic treatment on the silicon wafer etched in the step (1), growing titanium dioxide crystal seed on the surface of the silicon wafer, and placing the silicon wafer in a muffle for calcination; and (3), finally, placing the silicon wafer with the titanium dioxide crystal seed on the surface, obtained in the step (2), in a reaction kettle, and obtaining the silicon / titanium dioxide three-dimensional composite material by adopting a hydrothermal method. The composite material disclosed by the invention is compatible with capabilities of excellent reflection elimination and high-efficiency photo-induced charge separation, and can be applied to the fields such as photocatalysis, a photoelectric conversion device and a solar cell.

The invention discloses a surface oxygen vacancy ultrathin bismuth oxychloride nanosheet and a preparation method thereof. The preparation method comprises the following steps: selectively adding organic small molecule triethylamine with coordination ability into a system; utilizing a competitive coordination effect of small organic molecules to form surface defects; adjusting parameters of a hydro-thermal synthesis system; centrifuging, performing ultrasound treatment, washing and freeze drying; controlling to synthesize an ultrathin surface oxygen vacancy bismuth oxychloride two-dimensionalnanosheet material. By means of the technical scheme that the competitive coordination effect of the reducing small organic molecules is fully utilized to form the surface defects, the problem that anexisting ultrathin bismuth oxychloride nanosheet preparation method cannot accurately form the surface defects and has rigorous preparation conditions is solved. The method has the characteristics ofsimple production technology, safe production process and wide application to preparing inorganic functional materials.

The invention discloses a double-water-phase extraction method for cistanche deserticola phenylethanoid glycosides. The method comprises the following steps: 1) adding a cistanche deserticola raw material powder into a double-water-phase system; 2) extracting; and 3) transferring a phenylethanoid glycosides enriching phase, concentrating and drying, so as to obtain the cistanche deserticola phenylethanoid glycosides. The method for extracting phenylethanoid glycosides from cistanche deserticola is simple, high in extraction yield, easy for amplified continuous production operation, low in energy consumption, high in phenylethanoid glycosides content in the extract product, and overcomes the disadvantages that conventional method for extracting phenylethanoid glycosides from cistanche deserticola is tedious in operation, time-consuming, low in extraction yield, not high in extracted phenylethanoid glycosides quality, and the like.

The invention discloses a new method for preparing piribedil in a high-purity high-yield manner. The method is characterized by comprising the following steps of: utilizing piperidine as a raw material, and preparing the piribedil through four-step reaction, namely a blanc chloromethylation, an N-single protection piperazine ammoniation, deprotection and 2-cloro pyridine condensation. Compared with the traditional method, the method provided by the invention has the advantages that the N-single protection piperazine replaces piperazine, the piperazine dosage is reduced, a side reaction is alleviated, the impurities of a reaction process are reduced, the operation is simple, the condition is mild and is easy to control, the aftertreatment is convenient, according to the method, the environmental protection is realized, the total recovery is high, and the method is novel and used for industrially compounding piribedil.

The invention provides a preparation method of cadmium molybdate octahedrons with controllable grain size. The method comprises the following steps: adopting quaternary microemulsion composed of nonionic surfactant alkyl polyethenoxy (10) ether (OP-10), cyclohexane, n-octanol and water, using sodium molybdate and cadmium nitrate as reactants, mixing the components of inverse microemulsion, violently stirring with a magnetic stirrer to obtain uniform and transparent inverse microemulsion with stable property, then dropwise adding the microemulsion with cadmium nitrate in the microemulsion withsodium molybdate to react, ageing, centrifugalizing and washing the product with acetone, absolute ethanol and secondary water repeatedly to obtain the cadmium molybdate octahedrons having uniform shape, size and height. The invention adopts the technical scheme that the template action of the inverse micell microemulsion is used to prepare barium molybdate octahedrons so as to solve the problem that the grain size of the product is hard to control by using the existing preparation method of cadmium molybdate octahedrons. The method of the invention is characterized by simple production technology, safe production process and difficult agglomeration of the product and can be widely used in the preparation of inorganic functional materials.

The invention discloses a MnOx catalyst for catalytically eliminating benzene series in air and a preparation method of the MnOx catalyst. The active component of the catalytically eliminating benzene series in air is mixed oxide of MnO2 and Mn2O3; and the mixed oxide of MnO2 and Mn2O3 is provided with a mesoporous structure. The preparation method of the MnOx catalyst comprises the steps of primary dipping, primary roasting, secondary dipping, secondary roasting, template removing, washing and drying, and the like. The mixed oxide with mesoporous structure formed by base metal manganese is used as the active component of the catalyst provided by the invention, the catalyst cost is greatly reduced, and the MnOx catalyst has good benzene series catalytic combustion activity at high reaction air speed (66,000mL.h<-1>.g<-1>) and low reaction temperature (503K), and has good low temperature benzene series catalytic combustion activity.

The invention relates to a bionic artificial bone scaffold and a preparation method thereof. The method comprises the following steps: preparing material solutions A and B; utilizing an electrostatic spinning method to respectively prepare the material solutions A and B into a central channel layer and a peripheral column layer of a scaffold, wherein nanometer fibers in the central channel layer are in same spiral directions and the fibers in two adjacent nanometer fiber layers in the peripheral column layer are in opposite spiral directions; micro-level finely simulating a three-dimensional microenvironment of an osteon; hierarchically adding growth factors, supplying a differential inducing environment to seed cells BMSCs and constructing the bionic artificial bone scaffold with vascularizing tissues in the central channel layer and bone tissues in the peripheral column layer. The staggered orientation of the nanometer fibers in the scaffold can greatly enhance the structural stability; effective mechanic support is supplied to a bone defect part; the mutually connected network frame thereof is beneficial to cell permeation growth and blood vessel and nerve growth and also is convenient to transfer nutrient substances and metabolic wastes; the bionic artificial bone scaffold has ideal popularization and application values in the fields of biomedical materials and tissue engineering.

The invention provides a preparation method and application of a CoOOH nanosheet modified Fe2O3 composite photo-anode. The preparation method comprises the following steps: (1) impregnating a preparedFe2O3 electrode plate into a pre-prepared soluble cobalt salt aqueous solution, then carrying out air-purging drying on the electrode plate, and repeating the impregnating operation for several times; and (2) placing the Fe2O3 electrode slice impregnated with the cobalt salt in a strong alkaline solution for hydrolysis, then centrifugally washing the Fe2O3 electrode slice with deionized water, and drying the electrode slice in a drying oven to obtain the CoOOH nanosheet modified Fe2O3 composite photo-anode material. The method provided by the invention is simple and mild to operate, can be completed at room temperature, greatly reduces the energy consumption and risk of synthesis compared with the traditional synthesis method, and has a series of advantages of high catalytic water oxidation activity, good reaction kinetics and the like when being used as a photoelectrically decomposed water anode.

The invention relates to a preparation method of nanometer aluminum oxide / gadolinium-aluminum perovskite composite powder, and aims at solving the technical problems that an existing preparation method of Al2O3 / GdAlO3 composite powder is high in synthetic temperature, not suitable for large scale synthesis and high in cost, and difficultly controls a quick reaction. The preparation method of the nanometer aluminum oxide / gadolinium-aluminum perovskite composite powder includes: 1, preparing a gadolinium nitrate solution; 2, preparing an aluminum nitrate solution; 3, precipitating the gadolinium nitrate solution and the aluminum nitrate solution together; 4, centrifuging and drying the gadolinium nitrate solution and the aluminum nitrate solution after the gadolinium nitrate solution and the aluminum nitrate solution are precipitated together; 5, performing roasting. The preparation method of the nanometer aluminum oxide / gadolinium-aluminum perovskite composite powder has the advantages of using an alcohol-water heating method according to the principle that an electric medium constant of an alcohol-water solution is obviously reduced and ultrafine particles which are evenly dispersed are easy to form, is performed under mild conditions easy to control, can adapt to different aluminum oxide / gadolinium-aluminum perovskite composite powder systems, and simultaneously can control two phases of compositions, is low in production cost and simple, can not cause pollution on environment, can prepare the nanometer composite powder good in dispersion performance, and can achieve large scale volume production.

The invention discloses a method promoting bacterial leaching of photocatalytic semiconductor sulphide minerals through graphene, and belongs to the technical field of biological metallurgy. The technical scheme lies in that graphene has the advantages of good electrical conductivity, large surface area, good light transparency, and the like, can promote transfer of photoinduced electrons and increase the utilization rate of photoinduced electrons, and the leaching rate of the semiconductor sulphide minerals is remarkably increased; acidophilic iron-sulfur oxidizing bacteria leach the semiconductor sulphide minerals under the conditions of addition of 0.2 to 0.3 g / L graphene and illumination; compared with the leaching result obtained under the conditions that the environment is dark and no graphene is added, the leaching result obtained under the conditions that the light intensity is 6000 to 12000 Lux and the 0.2 to 0.3 g / L graphene is added has the advantage that the leaching rate is increased by 28.9% to 49.7%; and compared with the leaching result obtained under the conditions that the light intensity is 6000 to 12000 Lux and no graphene is added, the leaching result obtained under the conditions that the light intensity is 6000 to 12000 Lux and the 0.2 to 0.3 g / L graphene is added has the advantage that the leaching rate is increased by 3.3% to 19.9%. According to the method, the leaching rate of the semiconductor sulphide minerals can be remarkably increased, and the semiconductor sulphide minerals have better comprehensive utilization value.

The invention discloses an acrylic acid and sulfonated dihydroxypropyl chitosan modified polysulfone membrane and a preparation method thereof. The preparation method comprises the following steps: grafting acrylic acid (AA) on the surface of a polysulfone membrane (PSF membrane) through ultraviolet grafting to obtain an acrylic acid modified polysulfone membrane (AA-PSF membrane); grafting sulfonated dihydroxypropyl chitosan (SDHPCS) on the surface of the AA-PSF membrane through a condensation reaction of carboxyl and amino to obtain the acrylic acid and sulfonated dihydroxypropyl chitosan modified polysulfone membrane (SDHPCS-AA-PSF membrane). The invention is characterized by adopting the polysulfone membrane as a base membrane, grafting the acrylic acid on the membrane surface and thengrafting the sulfonated dihydroxypropyl chitosan to obtain the acrylic acid and sulfonated dihydroxypropyl chitosan modified polysulfone membrane which has good hydrophilcity and blood anticoagulation; moreover, the preparation technology is simple, and the conditions are mild and easy to control.

The invention relates to a method for synthesizing an ivabradine key intermediate (S)-4,5-dimethoxy-1-(methylamino)methyl-benzocyclobutane hydrochloride. The method comprises the following steps: performing chiral resolution on 4,5-dimethoxy-1-methylamino-benzocyclobutane to obtain an S configuration of the 4,5-dimethoxy-1-methylamino-benzocyclobutane; preparing formamide from amino group; and reducing with zinc powder to prepare the ivabradine key intermediate in the formula (I). Compared with a traditional method for preparing methylamine by reducing ethyl chloroformate, lithium aluminium hydride or sodium di-aluminum hydride, the method is simple in operation, high in product purity, little in side effect, mild and easily controllable in condition, convenience in post-treatment, environment-friendly, and higher in total yield, and is a brand-new method for synthesizing (S)- 4,5-dimethoxy-1-(methylamino)methyl-benzocyclobutane hydrochloride.

The invention discloses an advanced intermediate of rosuvastatin calcium and a preparation method of the advanced intermediate. An intermediate R1 is prepared from a chiral side chain D42 containing athiadiazole sulfone structure and a parent nucleus Z8.1 containing a pyrimidinecarboxaldehyde structure through Julia enylation reaction. The invention discloses a novel preparation method of R1. Theproduct provided by the invention has the advantages of low preparation cost, high total yield and good quality, and is suitable for industrial production.

The invention discloses a method for preparing fingolimod hydrochloride. The fingolimod hydrochloride is prepared by taking a compound (II) as starting material through six reaction steps such as hydrolysis, chlorination, reaction and salification. Compared with a traditional method, the method disclosed by the invention has the advantages that the required raw material is convenient and easily obtained, the operation is simple, the conditions are mild and easily controlled, the posttreatment is convenient, the environmental friendliness is realized and the yield in high; the method disclosed by the invention is suitable for industrial mass production.

The invention relates to a method for preparing a titanium dioxide pattern without a residue layer by a room-temperature transfer impressing technology. The method comprises the following steps: (1) mixing a thermoplastic polymer solution and titanium dioxide sol or a titanium salt solution to prepare a precursor solution; (2) spin-coating or spray-coating the surface of a soft template with the precursor solution in the step (1) to form a composite film, wherein the surface of the soft template has a convex-concave structure; (3) contacting the soft template obtained in the step (2) and a hydrophilic base at room temperature, and transferring the composite film to the surface of the base; (4) calcining the sample obtained in the step (3), and cooling to room temperature; (5) putting the sample obtained in the step (4) into a mixed solution of titanium salt, concentrated hydrochloric acid and water, and forming the titanium dioxide pattern without the residue layer on the surface of the base under the hydrothermal condition. The invention relates to the technical field of micro-nano processing of materials. The titanium dioxide pattern without the residue layer is prepared on planar and curved bases by the room-temperature transfer impressing technology.

The invention discloses a preparation method of a meta-aramid-based polyamide composite nanofiltration membrane. The preparation method comprises the following steps: dissolving 12 wt.%-20 wt.% of a meta-aramid polymer in a mixed solution of N,N-dimethylacetamide, an inorganic additive and an organic additive, coating a polyester non-woven fabric with the obtained solution, immersing the polyesternon-woven fabric in a coagulating bath, and preparing a meta-aramid porous base membrane by adopting a phase inversion method; immersing the meta-aramid porous base membrane into a polyamine solution, waiting for a period of time, taking out the membrane, and removing moisture on the surface of the membrane by using a rubber roller; immersing the membrane into a polyacyl chloride solution, carrying out an interfacial polymerization reaction, taking out the membrane, transferring the membrane into a drying oven, and carrying out heat treatment; and finally, taking out the membrane, immersing the membrane into deionized water, and conducting rinsing to obtain the polyamide composite nanofiltration membrane. The meta-aramid-based polyamide composite nanofiltration membrane has the advantagesof acid and alkali corrosion resistance, solvent resistance, long service life, simple process low production cost, pure water flux of 35 L.M<-2>.H<-1> under a transmembrane pressure difference of 0.5 MPa, a monovalent salt rejection rate of 30% or above, and a divalent salt rejection rate of 95% or above.

The invention discloses metal nanoparticles with peroxidase activity and a preparation method thereof. The preparation method comprises the following steps of (1), 50-200 microliters of phosphate buffered solution at 20-80 mM and pH value 5.0 and 20-100 micro liters of sodium tetrachloropalladate aqueous solution at 20-100 mM are added to a centrifuge tube of 1.5 mL; and (2), 20-100 microliters of reduced coenzyme sodium salt solution at 10-100 mM is added to the liquid obtained in the step (1), distilled water is added to make the final volume of the liquid be 400 microliters, the liquid is stirred and mixed evenly, and the liquid mixture is left to stand at 20-30 DEG C for 8-24 hours to obtain the metal nanoparticle liquid with peroxidase activity. The method is simple, short in period, mild in conditions, and easy to control, and facilitates large-scale industrial production and preparation; and the metal nanoparticles with peroxidase activity have high catalytic activity.

The invention discloses a Miao medicine preparation for treating osteoarticular diseases. The Miao medicine preparation is prepared from the following raw medicinal materials in parts by weight: 1 to 7 parts of radix angelicae sinensis, 1 to 3 parts of stigma saffron crocus, 1 to 4 parts of rhizoma Chuanxiong, 1 to 3 parts of cortex eucommiae and 1 to 3 parts of caulis sargentodoxae. The invention further discloses a preparation method of the Miao medicine preparation. The Miao medicine preparation for treating osteoarticular diseases provided by the invention can be used for effectively treating the osteoarticular diseases. The Miao medicine preparation for treating osteoarticular diseases has the effects of remarkably reducing the IL-1beta(Interleukin-1beta) expression and TNF-alpha(Tumor Necrosis Factor-alpha) expression, thereby restricting inflammatory response and protecting cartilage tissues. The Miao medicine preparation disclosed by the invention can be used for effectively treating cervical spondylosis, has a better curative effect and has the efficacies of tonifying the liver and kidney, strengthening tendons and bones, dispelling wetness and wind and promoting blood circulation to remove meridian obstruction, and can also be used for restricting neuropathic pain. The preparation method disclosed by the invention is simple and easy to operate, mild in conditions, easy to control, short in preparation time, low in cost and easy for large-scale production.

The invention belongs to the technical field of photocatalysis, and particularly relates to a preparation method and application of erbium-doped zinc cobaltate photocatalyst powder. The general formula of the photocatalyst is ZnEr2xCo2 (1-X) O4 where x is equal to 0.02 to 0.06. The preparation method is to use zinc cobaltate as a matrix which is doped with an erbium element, and the crystalline form of the doped matrix is not affected. The photocatalyst powder obtained is high in purity, and the photocatalysis performance is greatly improved. The preparation process realized by adopting direct sintering is simple and easy to operate, the calcination temperature is low, and the conditions are mild and easy to control. The sample prepared has the advantages of high purity, high yield and no need of adding precipitant and low cost, and is suitable for industrial production. The erbium-doped zinc cobaltate photocatalyst powder disclosed by the invention can be applied to increasing the photocatalytic degradation rate of Congo red.

The invention relates to the technical field of polymeric hydrogels and provides a strong-toughness and anti-fouling dual-network hydrogel and a preparation method thereof in order to solve the problem and defect that a traditional dual-network hydrogel is lack of biocompatibility and anti-protein non-specific adsorption property. The strong-toughness and anti-fouling dual-network hydrogel is prepared by chemically crosslinking N-hydroxyethyl acrylamide to form a covalent cross-linked network firstly, and then, forming physical crosslinking under a coordination effect of sodium alginate and multivalent cations interspersed in the covalent cross-linked network. The strong-toughness and anti-fouling dual-network hydrogel provided by the invention is excellent in mechanical properties and good in anti-fouling and antibacterial properties as well as biocompatibility so as to have a potential application prospect in the biomedical field; and the preparation method is simple in operation step, mild and easily-controlled in condition, free of specific requirements for equipment and beneficial to large-scale industrial production.

The invention discloses a method for promoting leaching of photocatalysis semiconductor sulfide mineral bacteria by oxalic acid, and belongs to the technical field of biological metallurgy. Semiconductor sulfide minerals are leached out under a light condition when the oxalic acid of 0.01-0.2 g / L is added into acidophilic iron-sulfur oxidizing bacteria. The oxalic acid can be in hole reaction with oxidizing light, the utilization ratio of photo-induced electrons is increased, and therefore the leaching rate of the semiconductor sulfide minerals is obviously increased. The leaching rate of the semiconductor sulfide minerals with the light intensity being 6000-8500 Lux and with oxalic acid of 0.01-0.2 g / L added is increased by 30.4-42.7% comparing with the leaching result of the semiconductor sulfide minerals with the light intensity being 0 Lux and with no oxalic acid added, and is increased by 5.3-15.3% compared with the leaching result of the semiconductor sulfide minerals with the light intensity being 6000-8500 Lux and with no oxalic acid added. The method can improve the photocatalysis efficiency so as to obviously improve the leaching rate of the semiconductor sulfide minerals, the semiconductor sulfide minerals have more comprehensive utilization value, and the method has great significance in achieving the application the semiconductor sulfide minerals as photocatalyst in the bioleaching field.

The present invention discloses an environmentally-friendly chemical woven bag comprising an outer layer, a middle layer and a base layer, the outer layer is a pearlised film layer, the middle layer is a polyethylene layer, and the base layer is prepared by alternately weaving warp and weft prepared from polypropylene. The present invention also discloses a preparation method of the environmental chemical woven bag. The environmental chemical woven bag has good waterproof and anti-corrosion properties, is clean in appearance, and three-dimensional, has UV resistance and high and low temperature resistance, and can replace paper-plastic bags for long-term storage of chemical products.

The invention discloses a high-efficiency nontoxic gas generating agent. The high-efficiency nontoxic gas generating agent is characterized in that the generating agent comprises the following ingredients, by weight, 8-12 parts of copper nitrate basic, 3-5 parts of potassium perchlorate, 4-6 parts of guanidine nitrate, 1-2 parts of carboxymethylcellulose sodium gel, 0.5-0.8 part of metal hydroxides, 2-3 parts of catalysts and 0.8-1.2 parts of processing adding agents. The gas generating agent provides gases with a necessary amount for filling an inflatable cushion in a short time, the burning rate scope is wide, slagging is easy, the filterability is good, the burning temperature is low, the generated gases are clean, have no solid particles and are nontoxic, namely, the contents of carbon monoxide, nitrogen oxides and chlorination products are low. The preparation technology of copper nitrate basic is simple, conditions are mild and easy to control, the cost is low, the safety and environment requirements are met, the sheet-shaped structure can provide large gaps and a large specific surface area, and the reactivity is raised.