1190results about How to "Raw materials are easy to get" patented technology

The present invention relates to a magnetic fluorescent double-functional microsphere with core-shell structure and its preparation method. Firstly, said invention uses strong acid and sodium citrate to modify surface of inorganic magnetic nano granules, then uses alkyl orthosilicate as precursor body, and adopts gel-sol process to prepare silicon dioxide magnetic microsphere with core-shell structure, finally utilizes the copolycondensation method of alkyl orthosilicate and silane coupling agent of bonded fluorescein to prepare silicon dixide fluorescent microsphere with magnetism. Said microsphere has magnetic response characteristic, and can send out fluorescence under the excitation of UV-light and visible light.

The invention provides a method of applying modified biodiesel as low sulfur diesel antiwear agent, comprising: adding modified biodiesel of 10- 2000ppm into low sulfur diesel, said modified biodiesel is produced through a 1-20 hour reaction with biodiesel and fatty alcohol or organic amine according to molar ratio of 1: 0.1- 5 at 50- 300 Deg. C . The biodiesel is the product of exchange between natural oil and fat and ester of low-carbon alcohol. By adding modified biodiesel into diesel with sulfur concentration lower than 500ppm can dramatically improve the lubricating property for low sulfur diesel.

The invention provides a completely new process route for synthesizing betamethasone and series products thereof. The invention adopts 1, 4, 9, 16-tetraene-pregna-3, 20-diketone as the original material which is modified by 9, 11 bits, 16, 17 bits and 21 bits so as to obtain the betamethasone and the series products thereof such as betamethasone acetate and betamethasone sodium phosphate and the like. The process has the advantage that the invention adopts the existing intermediates of manufacturers as the original material; the route is simple; the materials are available; the use of expensive accessories is avoided; the yield and the cost are dramatically better than that of the prior methods used for synthesizing the betamethasone and derivatives thereof; moreover, the adoption of the existing intermediates realizes the combined-line production of the betamethasone series products and dexamethasone series products, thus greatly reducing the manufacturing cost and the industrial manufacturing condition.

The invention disclose a method for intercepting and fixing the persistent organic contaminants of soil through bio-carbon which includes the following steps: 1) a biomass material is carbonized for 0.5 to 6 hours under the temperature of 250 to 550 DEG C and the condition of oxygen limitation and passes through the screen of 10 to 200 meshes, thus preparing the bio-carbon; 2) the prepared bio-carbon is added into the soil polluted by the persistent organic matters according to the ratio of 1 to 200tons/hektare and the soil within 0 to 30cm of a surface layer is ploughed for leading the soil to be fully mixed with the bio-carbon; 3) after being aged, the bio-carbon fiercely absorbs the persistent organic matters, thereby greatly reducing the biological effectiveness thereof and being capable of producing safe farm products in the oil polluted by the organic mattes. The bio-carbon adopted by the treatment method has the advantages of easy obtaining, low cost, environmental friendlessness, non-secondary pollution, simple preparation technique, good treatment effect and long time effectiveness; simultaneously the bio-carbon contains a plurality of carbon and other nutrition elements, thus being capable of providing abundant carbon sources and nutrition for the growing of soil crops and having the effect for enriching the soil.

The invention discloses a method for improving the mechanical stability of super-hydrophobic wood, belonging to the field of super-hydrophobic wood. The super-hydrophobic wood prepared by adopting the method disclosed by the invention overcomes the defects of poor surface mechanical property, short service life and the like of the super-hydrophobic wood prepared by adopting a conventional method, and is improved in durability and good in application prospect. A contact angle between the super-hydrophobic wood and water is more than 150 DEG, and a rolling angle is less than 10 DEG, therefore, the super-hydrophobic wood has excellent hydrophobic property and better self-cleaning property. The method comprises the following steps: soaking wood in epoxy resin to ensure that one layer of epoxy resin is covered on the surface of the wood; then soaking in a silicon dioxide solution grafted with an amino group to ensure that silicon dioxide reacts with epoxy resin so that the silicon dioxide is adhered on the surface of the epoxy resin to form a micro-nano secondary structure; and finally, carrying out hydrophobic modification on the micro-nano secondary structure on the surface of the wood, therefore the super-hydrophobic wood is prepared. The method is used for improving the mechanical stability of the super-hydrophobic wood.

The invention discloses a preparation method of Apremilast (I). The preparation method comprises the following steps: carrying out condensation on (R)-1-(Alpha-amino-benzyl)-2-isonaphthol (II) and 3-ethyoxyl-4-methoxybenaldehyde (III) to generate (1R, 3S)-1-phenyl-3-(3-ethyoxyl-4-methoxyphenyl)-2,3-dihydro-1H-naphthyl[1, 2-e][1, 3] oxazine (IV), carrying out cycloaddition reaction on the intermediate (IV) and a dimethyl sulfone organolithium salt to generate N-[(2S)-(1-(3-ethyoxyl-4-methoxyphenyl)-2-methylsulfonyl ethyl)]-(1R)-(Alpha-amino-benzyl)-2-isonaphthol (V), carrying out a hydrogenation reduction reaction on the intermediate (V) to prepare (S)-2-[1-(3- ethyoxyl-4-methoxyphenyl)]-1-methylsulfonyl-2-ethylamine (intermediate B), and carrying out condensation on the intermediate B and 3-acetamido phthalic anhydride (intermediate A) to prepare the Apremilast (I). The preparation method disclosed by the invention uses easily available raw materials and concise process, is economical, environment-friendly and suitable for industrial production.

The invention discloses a super-amphiphobic transparent nano coating and a preparation method thereof. Two different sizes (60-100nm and 20-50nm) of silica hybrid particles are prepared, and a coarse surface with a micro-nano structure is prepared by further reaction between the two hybrid particles. The sizes of the used hybrid particles are smaller than 100nm; scattering of a light of a visible light wave band is reduced, so that the condition that the prepared nano coating has high transparency on the visible light wave band is ensured, and then further surface energy-reducing treatment on the coarse surface is carried out by adopting a chemical vapor deposition method, so as to obtain the super-amphiphobic transparent nano coating. The prepared super-amphiphobic nano coating is significant in hydrophobic and oleophobic effects, high in transparency, and simple in production technology, and has a better practical application prospect.

The invention discloses a preparation method of tedizolid phosphate (I). According to the preparation method, a compound as shown in the formula II and a compound as shown in the formula III have a coupling reaction to generate tedizolid phosphate (I). The preparation method adopts easily available raw materials and a simple process, is economical and environmentally friendly and is suitable for industrial production.

The invention discloses a honeycomb-structured graphene aerogel ball and a production method thereof. The production method includes the steps of firstly, well mixing graphene oxide, water and alkaline substances to obtain slurry; secondly squeezing the slurry into coagulation bath through a needle to obtain a graphene oxide gel ball; thirdly, soaking the graphene oxide gel ball into water, adding reducing agent, and performing heating reaction for 10 hours to obtain a reduced graphene oxide gel ball; fourthly, placing the reduced graphene oxide gel ball into a low-temperature environment, freezing for 1-2 hours, and unfreezing under room temperature; fifthly, drying in an oven of 60 DEG C after solvent soaking and washing to obtain a reduced graphene oxide aerogel ball; sixthly, performing high-temperature treatment on the reduced graphene oxide aerogel ball under argon protection to obtain the graphene aerogel ball. The production method has the advantages that the method is simple in process and suitable for large-scale production, and the graphene aerogel ball produced by the method is excellent in resilience, conductivity and mechanical performance.

The invention discloses an injectable double-crosslinked hyaluronic acid aquagel and a preparation method thereof. The preparation method comprises the following steps: synthesizing formylated hyaluronic acid and amino/methylacryloyl bifunctional hyaluronic acid containing disulfide bond in the side chain, uniformly mixing the formylated hyaluronic acid and amino/methylacryloyl bifunctional hyaluronic acid containing disulfide bond in the side chain with a water-soluble photoinitiator, and carrying out photochemical polymerization to obtain the injectable double-crosslinked hyaluronic acid aquagel. The method has the advantages of accessible raw materials, mild reaction conditions, short reaction time, simple technique and the like. The prepared aquagel is formed by a Schiff base crosslinking mechanism and a photocrosslinking mechanism, and the two crosslinking networks are connected together. The crosslinking network chain of the aquagel contains the disulfide bond and Schiff base, and thus, the aquagel has dual sensitivities for reduction and pH. The hyaluronic acid aquagel has flexible and adjustable mechanical properties, microstructure, degradation property, swelling capacity and the like, is injectable, and has application prospects in the aspects of cell transfer, tissue engineering, three-dimensional cell culture and the like.

The invention relates to a long-chain triazine macromolecular flame retardant with a bicyclic phosphate structure and a preparation method thereof. The structure of the flame retardant is shown the specification, and the flame retardant is prepared by carrying out condensation polymerization on cyanuric chloride, 1-O-4-hydroxymethyl-2,6,7-trioxa-1-phosphabicyclo[2,2,2] octane (PEPA) and diamine, binary alcohol/phenol or binary thiol/thiophenol with a structural general formula of ZH-R-ZH in the presence of an acid-binding agent. The preparation method provided by the invention has the advantages that raw materials are readily available and the process is simple. The obtained intumescent flame retardant has the advantages of good thermal stability, high char yield at high temperature and significant expansion properties and can be used in the flame retardant modification of the materials singly or together with other materials; and the carbon source, acid source and foam source components of the flame retardant are in the same macromolecule, thus effectively solving the problems that the components of the flame retardant system are not uniformly distributed in the materials, overcoming the problems of volatilization, migration, exudation and the like of inorganic flame retardants and low-molecular-weight organic flame retardant systems and simultaneously alleviating the defects that the mechanical behavior of the materials deteriorates because of the addition of the flame retardant.

The invention discloses Beta-cyano phosphoryl derivatives as well as a preparation method and an application thereof. Alkene is used as an initiator, and raw materials are easy to obtain and wide in type; products prepared with the method are diversified in type and wide in application range, can be directly used and can be used for synthesizing organic phosphine flame retardants, drugs and extracting agents. Besides, the method adopts simple steps, has mild reaction conditions, causes low pollution and is suitable for industrial production, the yield of target products is high, and reaction operation and after-treatment process are simple.

The invention provides a co-doped micro-sphere-carbon fiber composite material and a preparation method thereof and belongs to the technical field of preparation of micro-nano composite materials. The method comprises the following steps: adding a high molecular material into a MOFs solution and stirring to obtain a mixed solution; carrying out electrostatic spinning on the mixed solution; putting a material subjected to the electrostatic spinning into a quartz boat and raising the temperature to be 700 DEG C to 900 DEG C under the protection of nitrogen gas; and carrying out heat treatment for 1h-3h to obtain the co-doped micro-sphere-carbon fiber composite material. The invention further provides the co-doped micro-sphere-carbon fiber composite material prepared by the preparation method. The preparation method is simple and raw materials are easy to obtain; and the composite material has very good electrochemical catalysis properties and can be widely applied to the aspects including oxygen reduction, oxygen releasing, hydrogen releasing and the like.

The invention relates to a preparation method of a nanofiber separation composite membrane with a gluing transition layer. The method comprises the steps of: (1) preparing a gluing layer macromolecule solution; (2) immersing a nanofiber non-woven fabric into the gluing layer macromolecule solution for treatment, so that a gluing layer can form on the surface of the nanofiber non-woven fabric; (3) preparing a functional barrier layer on the gluing layer, and conducting a heat treatment or chemical treatment finally, thus obtaining the nanofiber separation composite membrane. Being simple and practicable, the preparation method provided in the invention has easily available raw materials and low cost. And the nanofiber separation composite membrane of the invention can be widely used in the fields of nanofiltration, reverse osmosis and the like.

The invention discloses a preparation method of atorvastatin calcium, which comprises the steps of: firstly, synthesizing a primary ring segment compound of the atorvastatin calcium in the formula 5, and simultaneously synthesizing a side chain segment compound in the formula 16; carrying out pyrrole cyclization reaction on the primary ring segment compound in the formula 5and the side chain segment compound in the formula 16 to obtain a connecting intermediate compound in the formula 17; removing protective groups of the compound in the formula 17, carrying out saponification on ester groups of the compound in the formula 17 to obtain sodium salt compound in the formula 18 of the atorvastatin; and adding a calcium chloride water solution in a water solution of the compound in the formula 18 to be filtered to obtain the atorvastatin calcium. The invention has easy obtaining and low cost of the raw materials and higher synthesis yield, and can overcome the defects of the prior art.

The invention discloses a method for partially oxidizing sodium alginate. The steps of the method are as follows: 1) a sodium alginate solution is prepared; 2) a potassium permanganate solution is prepared; 3) the pH value of the sodium alginate solution is adjusted by an acid solution; 4) the potassium permanganate solution is added to the sodium alginate solution and stirred for reaction under conditions of room temperature and light prevention; the oxidizing reaction stops when the mixed solution is colorless; 5) the solution after reaction is added with sodium chloride and then added with ethanol so as to separate precipitation out of the filtrate, and coarse products are obtained after decompression and pumping filtration; 6) the coarse products are dissolved in water and dialyzed; 7) after the complete dialysis, dialyzate is pre-freezed and then freeze-dried, and finally partially oxidizing sodium alginate products are obtained. The method has the advantages of simple and easy control of process, easy collection of raw materials, low cost and convenient popularization and application; the partially oxidizing sodium alginate prepared can be used to degrade gel materials, drug slow release materials, biological carrier materials and tissue engineering materials, etc.

The invention discloses a preparation method for spinel structure lithium titanate. The invention is characterized in that titanate and lithium inorganic compound and organic acid or ammonium salt with low cost is taken as the raw material; the gel precursor is compounded through simple composite water solution sol and gel route; the precursor reacts for 1 to 8 hours by ranging from 500 DEG C to 800DEG so as to obtain loosened porous nanometer spinel structure lithium titanate(Li4Ti5O12) with granularity range from 0.5 to 10 micrometers and without impurity. The granularity of the product reaches 100nm to 500nm after being grinded through a planetary ball mill. The performances such as the circulated volt-ampere characteristics, the high current performance and the Ohm essential resistance of products prepared with the invention are obviously superior to that of products prepared through solid state reaction, with circulated rate capability of 100mAh/g to 165mAh/g, thereby being high performance cathode materials for lithium ion battery. The invention has the advantages of low raw materials cost, simple procedure, suitable industrial transformation, and excellent product performance.

The invention discloses a method for manufacturing anode materials for sodium ion batteries and application of the anode materials. Different types of metal are doped in each anode material. The anode materials can be expressed as Na<2/3>A<1-x>B<x>O<2>. The A represents selected transition metal with electrochemical activity, the B represents the doped metal, and the content x of the B is higher than 0 and is lower than or equal to 0.20. The method includes mixing materials at earlier stages; drying the materials and carrying out heat treatment on the materials; compressing the materials to obtain sheets; calcining the sheets at high temperatures to obtain the metal-doped anode materials for the sodium ion batteries. The method and the application have the advantages that the anode materials for the sodium ion batteries have high discharge voltages and are high in circulation capacity and excellent in stable circulation, accordingly, the specific capacity and the energy density of the batteries can be greatly improved when the anode materials are used as anodes of the sodium ion batteries, and the anode materials have excellent application prospects.

The invention discloses an antibacterial mildew-resistant powder coating. The antibacterial mildew-resistant powder coating comprises following ingredients, by mass, 15 to 25 parts of epoxy acrylic resin, 2 to 4 parts of triglycidyl isocyanurate, 5 to 8 parts of bisphenol A epoxy resin, 45 to 60 parts of hydroxy polyester resin, 5 to 10 parts of hydroxy acrylic resin, 40 to 50 parts of a filling material, 0.3 to 0.5 part of a levelling agent, 0.2 to 0.6 part of a degassing agent, and 1 to 5 parts of a nano inorganic mildew inhibitor. The raw materials of the antibacterial mildew-resistant powder coating are easily available, and are cheap; a preparation method of the antibacterial mildew-resistant powder coating is simple; scratch resistance of the antibacterial mildew-resistant powder coating is excellent; glossiness is controllable, and is less than 5%; weather resistance is excellent; nano TiO2, nano ZnO, and nano SiO2 are added, and long-lasting antibacterial performance is obtained because of adding of the inorganic materials; and the antibacterial mildew-resistant powder coating is nontoxic, is friendly to the environment, and is suitable for industrialization.

The invention discloses a preparation method for 2-amino-4, 6-dimethoxy pyrimidine, which includes the following steps: 1, malononitrile and methanol are used as raw materials and perform addition reaction in organic solvent to obtain 1, 3-dimethoxy malononitrile imine dihydrochloride; 2, the 1, 3-dimethoxy malononitrile imine dihydrochloride is added in alkali solution, and cyanamide and disodium hydrogen phosphate are added in the alkali solution to perform cyanamide reaction so as to obtain 3-amino-3-methoxyl-N-cyan-2-propionamidine; and 3, the 3-amino-3-methoxyl-N-cyan-2-propionamidine is added in toluene solution, stabilizing agent is added in the toluene solution to perform ring closing reaction so as to obtain 2-amino-4, 6-dimethoxy pyrimidine. The preparation method is safe, environment-friendly, economical, high in yield and purity and suitable for industrial production.

The present invention discloses a production method of artificial fish bank. Said production method includes the following steps: firstly, making a stereo fish bank skeleton, placing at least two closed flexible tube moulds in which flowable substance is filled up in the fish bank skeleton interior, then filling the concrete into the fish bank skeleton, at the same time making the flexible tube mould and connecting member be filled in the concrete, make at least one end of flexible tube be exposed to exterior, after the concrete is solidified, pouring out the flowable substance from the flexible tube mould, at the same time drawing out the flexible tube mould so as to form the invented fish bank whose interior and surface have porous structure.

The invention discloses winkle feed and a preparation method. The winkle feed is characterized by comprising, by weight percentage, dried waste fish or fish meal, soybean cake powder, bran, rice husk, vegetable leaves, grass meal, bone tankage, animal visceral meal and shell powder. The method includes: taking the substances according to the proportion, respectively sufficiently grinding the substances, sieving via a 80-mesh sieve, beating the vegetable leaves into vegetable slurry, feeding the raw material powder and the vegetable slurry together into a fish feed mixing machine for mixing for 50 minutes, using a special fish feed circular mould pelletizer to prepare pallet feed with the particle size of 2 millimeters, and airing the feed prior to bagging and packaging. The winkle feed is prepared from multiple feed raw materials in a proportioned manner, provides a feed basis for winkle production, and is reasonable in proportioning of animal protein and vegetable protein in components, rich in nutrient components, and beneficial to digestive absorption of winkles to the various nutrient components. The feed prepared by the formula is easily available to raw materials, good in palatability, easy for digestion and fast in absorption, and the winkles are fast in growth, high in disease resistance and high in cultivation survival rate.

The invention discloses a non-halogen fire resistant low-temperature shrinkable and heat-shrinkable pipe material and a preparation method thereof. The preparation method of the material comprises the following steps: using ethylene-vinylacetate copolymer as base material to add nitrogen and phosphorus series fire retardant, inorganic fire retardant and other additives, and performing mixing granulation, extrusion moulding, irradiation crosslinking, extension forming and other working procedures to obtain the finished product. By adopting the preparation method of the invention, the defects of the prior art such as high response temperature of heat-shrinkable pipe and poor fire resistance can be overcome; and the product has good performance, meets the requirements of environmental protection and is suitable for the cables and components in war industry, aviation and aerospace, civil high-end electrical and electronic equipment and the like.

The invention relates to a compound microbial inoculum for decomposing straw as well as preparation method and application thereof. The compound microbial inoculum for decomposing straw comprises bacillus subtilis, bacillus megaterium, bacillus pumilus, bacillus cereus, fused lactobacillus, azotobocter chroococcum and saccharomyces cerevisiae. A straw bio-organic fertilizer can be prepared by processing the straw by adopting the microbial inoculum. The invention has easy material obtaining, simple production method; and in addition, the straw bio-organic fertilizer has sufficient organic matter fermentation and good fertilizer efficiency and can generate non-polluted green foods and organic foods and play certain roles in improving the soil quality and protecting the environment.

The invention relates to organic biological feed additives containing nano selenium and zinc oxide, a preparation method and a use method. The product of the organic biological feed additives is russety dry powder with a granularity between 80 and 140 nanometers, and can form suspension with water; the selenium content is between 0.00 and 36.00 percent and the zinc content is between 0.00 and 45.00 percent; the selenium content and the zinc content can not be 0 simultaneously; the organic biological feed additives are prepared by nano selenium organic biological intermediates and nano zinc oxide organic biological intermediates which are respectively prepared by fermentation of selenium dioxide and nano zinc oxide through microorganisms in the presence of various nutrient components; and 2.3 to 11.5 mass times of water is uniformly mixed with the organic biological feed additives containing the nano selenium and the zinc oxide and then sprinkled in feed which is then used for feeding laying hens, milk cows or nanny goats for 5 to 10 days. Compared with contrast feed, the selenium content and the zinc content of produced eggs are respectively 2 to 5 times and 2 to 2.5 times; the selenium content and the zinc content of produced milk are respectively 3 to 6 times and 2 to 4 times; and the selenium content and the zinc content of produced goat milk are respectively 3 to 7 times and 3 to 6.5 times.

The invention describes a preparation method of a rigid polyurethane foam wood-imitation material. The preparation method comprises the following steps: taking a mixture of polyether glycol, a catalyst, a foam stabilizer, a foaming agent, a fire retardant and the like as a white material, taking polymethylene polyphenyl isocyanate as a black material, injecting a certain amount of the mixed materials into a mould at temperature of 23-25 DEG C of the white material and the black material with mechanical stirring rate of 2000-3000r/min and mass ratio of the white material to the black material as 100/105-110, and demoulding after being at constant temperature of 35 DEG C for half an hour to obtain the rigid polyurethane foam wood-imitation material. The polyether glycol in the white material is a mixture of GR-4110, GR-403 and GE-210; the catalyst is a mixture of SFC, A33 and PC-41; the foam stabilizer is AK-8805, and the foaming agent is a mixture of HCFC-141b and H2O; and the fire retardant is DMMP. The black material is PM-200, Suprasec 5005 or Desmodur 44V20L.

The preparation process of phosphate radical adsorber features that powdered inorganic mineral soil containing silica, magnesia, alumina and ferric oxide is made to mix with water solution of oxychloride capable of hydrolyzing to obtain white or brown precipitate, and the precipitate is further high temperature treated to obtain the porous granular adsorber. The porous granular adsorber has great amount of hydroxyl radicals in the surface and can produce exchange reaction with phosphate radical in water to eliminate phosphate radical, so that it may be used in the purification of phosphate containing water and the treatment of phosphate containing sewage. The adsorber has low cost, easy-to-obtain material, great adsorption capacity, high selectivity, simple operation acid and alkali resistance, radiation resistance and simple regeneration, and the concentrated phosphate radical may be used in producing fertilizer or for agricultural production directly.

The invention belongs to the technical field of organic matter catalytic degradation materials, and provides a biochar-loaded zero-valent iron composite material and a preparation method thereof. Thepreparation method comprises the following steps that 1, a biomass material is mixed with an aqueous solution of an iron source, and ultrasonic dispersion is carried out to obtain a raw material mixture, wherein the iron source is at least one of iron salt and ferrous salt; 2, a hydrothermal reaction is carried out on the raw material mixture to obtain an iron-carbon precursor; 3, the iron-carbonprecursor is calcined in an inert gas atmosphere to obtain the biochar-loaded zero-valent iron composite material. According to the method, a reducing agent is not needed, the raw materials are cheapand easy to obtain, the amount of generated wastewater is small, the operation is simple, and the method is an environment-friendly process.

The invention discloses a novel method for synthesizing (1R,2R)-2-(2,3-dihydrobenzofuran-4-yl) cyclopropanemethylamine. The method comprises the following steps: chloridizing (1R,2R)-2-(2,3-dihydrobenzofuran-4-yl) cyclopropanecarboxylic acid to generate (1R,2R)-2-(2,3-dihydrobenzofuran-4-yl) cyclopropane carbonyl chloride; (2) performing ammonolysis on (1R,2R)-2-(2,3-dihydrobenzofuran-4-yl) cyclopropane carbonyl chloride to generate (1R,2R)-2-(2,3-dihydrobenzofuran-4-yl) cyclopropane formamide; and (3) reducing the (1R,2R)-2-(2,3-dihydrobenzofuran-4-yl) cyclopropane formamide to generate the (1R,2R)-2-(2,3-dihydrobenzofuran-4-yl) cyclopropanemethylamine. The method provided by the invention has the advantages of easily available raw materials, simplicity in operation, higher yield in each step, less side reaction, high product purity, simplicity and convenience in post-treatment, and suitability for industrialized production.

The invention discloses a preparation method of a water-soluble N-acetyl-L-cysteic acid-modified CdTe quantum dot. The preparation method comprises the following operating step of: under the protection of nitrogen gas, injecting a prepared sodium hydrogen telluride NaHTe or potassium hydrogen telluride KHTe solution into a prepared mixed solution of a cadmium salt and water-soluble N-acetyl-L-cysteic acid to obtain a water-soluble CdTe quantum dot with an adjustable fluorescence emission wavelength and high fluorescence quantum yield. The invention has the advantages: the method has the advantages of readily-available raw materials, low cost, easiness and safety for operating, environment friendliness and the like; and the prepared water-soluble CdTe quantum dot has the advantages of high water solubility, adjustable fluorescence emission wavelength, high fluorescence quantum yield, high biocompatibility and the like, and can be taken as a novel fluorescence nano-probe for wide application to the fields of biochemical analysis and biomedicine.