32results about How to "Non-toxic method" patented technology

The invention belongs to the field of food and medicine and relates to a method for improving the viscosity of gelatin by using a glutamine transaminase for catalyzing gelatin crosslinking. According to the method, gelatin molecules are catalyzed to crosslink by using the glutamine transaminase at a certain pH value and temperature, the adjustment on the viscosity of the gelatin can be realized through controlling the reaction time and the addition of the glutamine transaminase. The method can be widely applied to bone gelatin and skin gelatin which are prepared by acid, alkali and enzyme methods. The method disclosed by the invention is safe and non-toxic, is simple in process and is applicable to gelatin production plants or application units; and the viscosity of the gelatin is improved through the method disclosed by the invention, so that the quality and application value of the gelatin are improved.

The invention relates to a preparation method of a boron nitride nano tube. The method comprises the steps of carrying out ball milling on metal magnesium powder and low-cost boron oxide as a boron source instead of B to prepare a precursor; preparing the pure-phase boron nitride nano tube with a high length-diameter ratio in high-temperature ammonia gas atmosphere in a vertical induction heating furnace. According to the invention, used raw materials are boron oxide powder and metal magnesium powder which both belong to ordinary chemical raw materials which are industrially produced, are low and easily available and non-toxic; the synthesized boron nitride nano tube is high in purity, large in length-diameter ratio, little in defect and uniform in morphology; the method is non-toxic, reliable and suitable for synthesis on large scale; the prepared boron nitride nano tube can be applied to the fields of nanoelectronics, electronic heat dissipation elements, solid/liquid lubricants, nano composite materials, high-temperature structure members and the like.

The invention relates to a preparation method of biobased water-borne UV (ultraviolet) curing environment-friendly nail polish. The preparation method is characterized by comprising the following steps of weighing 30 to 50% of biobased water-borne UV curing environment-friendly nail polish resin, 5 to 10% of deionized water, 40 to 60% of pigment, 0.1 to 0.5% of wetting dispersant, 0.1 to 0.5% of flatting agent, 0.2 to 0.5% of defoaming agent, and 1.0 to 2.0% of thickener; adding the pigment, the wetting dispersant, the flatting agent, the defoaming agent and the deionized water into a ball mill to mill, so as to obtain a color paste a; adding the biobased water-borne UV curing environment-friendly nail polish resin into the color paste a, stirring at high speed, adding the thickener, and filtering by a 200-mesh filter net, so as to obtain the biobased water-borne UV curing environment-friendly nail polish. The prepared biobased water-borne UV curing environment-friendly nail polish has the characteristics that the curing speed is quick, the transparency is good, the storage stability and luster are high, the adhesion force is good, and the like. The preparation method has the advantages that the green, environment-friendly, non-toxic and non-odor effects are realized, and the product cost is reduced.

The invention provides a method for preparing an oil body. The method comprises the following steps: (i) providing an oil material; (ii) damaging cell walls and/or damaging cellulose, pectin, hemicellulose or glucan in the cell walls of the oil material in the presence of water and an enzyme; (iii) separating to obtain the oil body.

The invention provides a method for simultaneously preparing an oil body and non-hydrolyzed protein, comprising the following steps: (i) providing an oil material; (ii) in existence of water and enzyme, destroying the cell walls of the oil material and/or destroying cellulose, pectin, hemicellulose or glucan in the cell walls of the oil material; and (iii) separating the oil body and protein obtained by reaction.

The invention discloses a preparation method of a silver phosphate film, belonging to a preparation method of a photo-catalytic and photo-electrochemical material of a semiconductor. The preparation method of the silver phosphate film comprises the following steps: (1) ultrasonically washing a glass or silicon wafer substrate by using ethyl alcohol and an acetone reagent sequentially; (2) depositing an Ag film on the substrate by using sputtering and thermal evaporation methods; (3) dropwise adding silver nitrate AgNO3 to the Ag film until the Ag film is fully filled with silver nitrate AgNO3, carrying out spin-coating and drying; and then dropwise adding a disodium hydrogen dodecahydrate Na2HPO4 aqueous solution, carrying out spin-coating and drying; and (4) putting the Ag film in a muffle furnace, heating to 300-550 DEG C, and sintering for 0.5-3h under the condition of preserved temperature to obtain the silver phosphate Ag3PO4 film, wherein the mass percent concentration of a silver nitrate AgNO3 aqueous solution is 0.017%-0.34%; the mass percent concentration of the disodium hydrogen dodecahydrate Na2HPO4 aqueous solution is 0.014%-0.28%; the silver phosphate Ag3PO4 film with the structure has a thickness of 0.3-10 microns. The preparation method of the silver phosphate film has the advantages that the method is simple, non-toxic and easy to operate; the inert atmosphere protection is not needed in the method, so that the method is low in cost and suitable for industrial production; the film prepared by the method is relatively good in adhesive force; and the thickness of the film is easy to control.

The invention relates to a novel method for preparing a chiral dicarbonyl derivative by catalysis, needs to overcome various defects in the conventional method for preparing the chiral dicarbonyl derivative and provides an environment-friendly, economic, efficient and nontoxic method for preparing the chiral dicarbonyl derivative. The method of the invention is characterized in that a chiral diamine derivative is used as a catalyst, the molar ratio of the catalyst to raw materials is 1:10-20 and the target product, namely the chiral dicarbonyl derivative is obtained by performing reaction at the normal pressure and the room temperature in a non-polar solvent; the raw materials are an achiral dicarbonyl derivative and a nitroolefin derivative and the molar ratio of the using amount of the achiral dicarbonyl derivative to the using amount of the nitroolefin derivative is 1:1; the non-polar solvent is toluene; and the catalyst is one of the following catalysts from a to i.

The invention discloses a heterostructure catalyst for decomposing water into hydrogen by utilizing solar energy and a preparation method of the catalyst, and belongs to a preparation method of a semiconductor photocatalytic material. The preparation method comprises the following steps: 1) dispersing SiO2 nanospheres into deionized water, adding urea and nickel nitrate, and uniformly conducting mixing; 2) transferring the mixed solution into a hydrothermal reaction kettle, and conducting reacting at 105 DEG C for 12 hours; (3) after natural cooling, centrifuging a product, and drying the product to obtain SiO2-coated nickel silicate powder; (4) dispersing the SiO2-coated nickel silicate into deionized water, adding sodium sulfide, and adjusting the pH of a mixed solution by using NaOH; 5) transferring the mixed solution into a hydrothermal reaction kettle, and conducting reacting at 160 DEG C for 12-20 hours; 6) after natural cooling, centrifugally collecting black precipitates, and performing vacuum drying to obtain NiS hollow nanosphere powder; 7) dissolving NiS and glycerin in water, and adding zinc chloride, indium chloride and thioacetamide; 8) reacting the solution for 2 hours at 80 DEG C in a stirring state; and 9) carrying out centrifugation, washing and drying to obtain NiS-coated ZnIn2S4. The NiS-coated ZnIn2S4 spherical heterostructure has the advantages of large specific surface area, low density, good surface permeability and visible light response.

The invention discloses a preparation method of a visible light absorption layer based on an Ag3PO4 film, and belongs to a preparation method of photocatalysis and photoelectric materials. The visible light absorption layer is prepared by using a four-step process including coprecipitation, spin coating, drying and sintering, and the method comprises the steps of 1) preparing Ag3PO4 nano-scale ultrafine powder of which the size scale is between 20 and 500 nm by using a coprecipitation method; 2) ultrasonically dispersing the Ag3PO4 powder into transparent organic solvents, and performing spin coating on the obtained sol shaped dispersion liquid on a substrate to obtain a prefabricated Ag3PO4 film layer; and 3) putting the prefabricated Ag3PO4 film layer into an oven at the temperature of 20-80 DEG C for drying, and putting into a muffle furnace for sintering and removing organic residues. The Ag3PO4 visible light absorption layer has a thickness of 0.2-10 microns, and is high in response characteristics and adhesive force of visible light; because the visible light absorption layer is used as a photocatalyst, the visible light absorption layer is easy to recover, can be used for a photo-anode of a photoelectrochemical cell, and has a large application potential on the fields of light degradation pollutants, photolysis of water, photovoltaic conversion and the like. The method is simple, free of toxicity, easy to operate and low in cost.

The invention relates to a method for detecting lithium ion content of an anodization tank liquid. The method comprises the steps of apparatus analysis condition selection, reagent preparation, standard solution preparation, spectrum measurement, theoretical tank liquid preparation and spectral measurement. The invention provides the method for detecting lithium ion content of an anodization tank liquid by an inductively coupled plasma emission spectrometer (ICP-OES). The method can effectively shorten analysis detection time by 50% and fills in the blank of detection of the metal ion content of the anodization tank liquid by the inductively coupled plasma emission spectrometer. The method is accurate, simple and fast. The method widens application of the inductively coupled plasma emission spectrometer in the tank liquid analysis field, is nontoxic and environmentally friendly and effectively solves the problem of environmental pollution in tank liquid analysis.

The invention relates to a deoxidized fresh-keeping method for pleurotus eryngii, and belongs to the technical field of fresh keeping of edible fungi. The deoxidized fresh-keeping method comprises thefollowing steps of 1, iron powder activation; 2, slow release of activated iron powder, wherein the activated iron powder is coated with hydrophobically modified sodium alginate; 3, preparation of adeoxidizing agent, wherein the deoxidizing agent is an iron-based deoxidizing agent; 4, packaging of the deoxidizing agent, wherein the prepared deoxidizing agent is put into 4-centimeter-long and 3-centimeter-wide breathable small packaging bags with holes; 5, pre-cooling of the raw material, wherein the pleurotus eryngii is pre-cooled for 24 hours at the temperature of 8 DEG C; 6, subpackaging of the raw material, wherein the pre-cooled pleurotus eryngii is subpackaged into polyethylene packaging bags; 7, deoxidized packaging; 8, low-temperature storage. By means of the fresh-keeping method,the cold storage life of the pleurotus eryngii can be obviously prolonged, and the original flavor and taste of the pleurotus eryngii can be well maintained. The method is simple in operation, safe,free of toxicity, low in cost and wide in market application prospect.

The invention discloses a method for reducing microbiological indicators of corn starch, and belongs to the technical field of corn starch. The invention discloses a method for reducing microbial indicators of corn starch, and the method comprises ozone treatment, ultraviolet treatment, filtration and temperature control for reducing the microbial indicators of washing water. Reverse osmosis water is added into washing water, so that the buffering capacity of the water is reduced, and pH regulation and control are facilitated; ozone is introduced into a pipeline for conveying starch milk, so that the microbiological indicators of the material is reduced. According to the method disclosed by the invention, no pollution is caused in the production process, the use is convenient, the effect is obvious, and the microbiological indicators in the obtained corn starch can be effectively controlled below the national hygienic standard requirement of edible corn starch.

The invention discloses a cobalt-lanthanum co-doped visible-light response BiVO4 photoelectrode and a preparation method thereof, and belongs to the field of nano functional materials. The method comprises the following steps: 1) adding p-benzoquinone and ethanol into an aqueous solution dissolved with potassium iodide and bismuth nitrate, and fully stirring; 2) taking the solution as an electrolyte, carrying out electro-deposition for 5-15 minutes, and depositing on a conductive substrate to obtain a bismuth oxyiodide (BiOI) film; 3) dissolving vanadyl acetylacetonate in dimethyl sulfoxide, adding a proper amount of cobalt source and lanthanum source, and uniformly stirring and mixing; (4) transferring the dimethyl sulfoxide solution mixed with the vanadium source, the cobalt source and the lanthanum source, and uniformly coating a bismuth oxyiodide (BiOI) film with the dimethyl sulfoxide solution; 5) transferring into a muffle furnace, and calcining for 1-2 hours at the temperature of 400-550 DEG C; and (6) taking out a sample, soaking the sample in a sodium hydroxide solution for 30-60 minutes, cleaning and drying to obtain the cobalt-lanthanum co-doped bismuth vanadate (Co/La-BiVO4) nano-porous electrode. The preparation method has the advantages that the visible light response of the BiVO4 film can be effectively enhanced through co-doping of cobalt and lanthanum elements, and better photoelectrochemical hydrogen production performance is obtained.