109 results about "Tetracycline Hydrochloride" patented technology

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

The invention relates to a medication method of pearl nuclei. The technical proposal adopted by the method for solving the technical problems thereof is as follows: high-purity gelatin, tetracycline hydrochloride, polyvinylpyrrolidone (PVP) and vitamin C are weighed respectively as according to the mass ratio of 2-4%, 5-8%, 0.4-0.8% and 0.2-0.4%, added with sterilized seawater to 1,000ml, stirred in water bath at 50 DEG C and dissolved overnight; the pearl nuclei (clam or tridacna shells are ground to be round) are heated in a 50-60 DEG C thermotank to the temperature of 50-60 DEG C, the pearl nuclei are taken out, the overnight dissolved solution is put into a paint sprayer, and the surface of the pearl nuclei is sprayed and continuously turned over to cause the sprayed drug layer to be even, smooth and dry; the pearl nuclei are packaged in vacuum and transported to a pearl cultivation farm, pearl-culturing oyster are inserted into the pearl nuclei by the conventional nuclei insertion technology, and then post-operation recuperation and hanging cultivation are carried out. The medication method of the pearl nuclei has the advantages of effectively improving pearl nacre, lowering the mortality rate and nuclei spitting rate, improving the pearl output and economic benefit of breeding production, simple using method, easy operation and remarkable effect.

The invention discloses a method for detecting tetracycline hydrochloride by using terahertz time-domain spectroscopy, which comprises the following steps: preparing tetracycline hydrochloride tablet samples with different mass percents; acquiring terahertz time-domain spectra of the tetracycline hydrochloride tablet samples; performing Fourier transformation treatment on the terahertz time-domain spectra of the tablet samples, and obtaining absorption coefficients and refractive indices of the tablet samples through a formula; establishing a correction model according to the mass percent of each tablet sample and the corresponding absorption spectrum; and verifying and evaluating the correction model. According to the invention, the qualitative and quantitative detection of tetracycline hydrochloride can be realized; and the method has the advantages of simple sample pretreatment, easy operation, favorable repetitiveness, relatively accurate test result and the like. Thus, the method is of far reaching importance for detecting antibiotic residue in foods by using terahertz time-domain spectroscopy.

The invention discloses a trace antibiotic efficient enrichment and separation method in a water environment. The adsorption performance of magnetic graphene on tetracycline antibiotics under different adsorption conditions is studied, and the change of the antibiotic concentration in solution before and after the adsorption is detected by an ultraviolet spectrophotometer, so that the corresponding adsorption rate of the antibiotics and the magnetic graphene adsorption capacity are calculated. The influence of different factors on the adsorption performance of the antibiotics is investigated; the optimum adsorption condition is obtained; the adsorption effect mechanism is analyzed; the adsorption kinetics and adsorption thermodynamics are discussed. According to the method, tetracycline hydrochloride TC is adopted as the research object, and the adsorption characteristics of MGO on the TC under different factors of the solution pH, temperature, dissolved organic matter (taking humic acid as an example) and the like are systemically studied, in particular to the adsorption kinetics and adsorption thermodynamics of the MGO on the TC.

The invention belongs to the field of environmental technology and water treatment and specifically relates to a preparation method of a catalyst for photocatalytic degradation of antibiotic, a catalyst prepared by the method and application of the catalyst for photocatalytic degradation of antibiotic. The catalyst is anatase-phase banded-structure nanocrystal titanium dioxide exposing the crystal face {100}, and is synthesized by a homogeneous hydrothermal reaction and a calcination technology. The catalyst shows outstanding photocatalytic degradation performance on the photocatalytic degradation of broad-spectrum antibiotic medicines such as oxytetracycline, tetracycline hydrochloride, amoxicillin, norfloxacin and enrofloxacin. The catalyst has the characteristics of high activity, stable performance, easiness in separation, no toxicity and the like; the synthesis technology is pollution-free; the catalyst has a broad application prospect while the antibiotic medicine pollution is increasingly severe.

The invention discloses a terahertz time-domain spectroscopy method for quantitatively detecting tetracycline hydrochloride solutions. The method comprises the following steps: preparing polyvinylidene fluoride film samples of the tetracycline hydrochloride solutions with different concentrations; collecting terahertz time-domain spectroscopies of the polyvinylidene fluoride film samples of the tetracycline hydrochloride solutions; performing fourier transform processing on the terahertz time-domain spectroscopies of the polyvinylidene fluoride film samples, and using a formula to obtain absorption spectrums of the polyvinylidene fluoride film samples; establishing a correction model for predicting tetracycline hydrochloride concentrations; performing verification and evaluation on the correction model. The method can realize quantitative detection of the tetracycline hydrochloride solutions, and has the advantages of simplicity in pretreatment of the samples, easiness in operation, good repeatability, simplicity in data processing, relative accuracy in testing results and the like. Therefore, an important significance is provided by using the terahertz time-domain spectroscopy technology to detect antibiotic residues in liquid food.

The invention discloses a Fe3O4 / MoS2 / BiVO4 material preparing method, a product and an application of the product. The method comprises the steps: firstly, dissolving ferric chloride hexahydrate, sodium acetate and polyethylene glycol in ethylene glycol, carrying out a reaction at the temperature of 180-200 DEG C for 8-9 h, and thus obtaining ferric oxide; then, mixing sodium molybdate dehydrate,sodium molybdate tetrahydrate and thiourea evenly, adding ferroferric oxide, and carrying out a reaction for 22-24 h at the temperature of 180-200 DEG C, to obtain a Fe3O4 / MoS2 material; finally, dissolving bismuth nitrate pentahydrate and ammonium metavanadate in deionized water, adding the Fe3O4 / MoS2 material, mixing evenly, carrying out a reaction for 15-17 h at the temperature of 160-170 DEG C, and thus obtaining a Fe3O4 / MoS2 / BiVO4 composite material. When the composite material is used as a photocatalyst for treating tetracycline hydrochloride wastewater, the degradation rate can reach 90% or more, and the photocatalytic efficiency can be improved. At the same time, because of the presence of Fe3O4, the photocatalyst can be recovered more conveniently and simply for repeated experiments, the recovery cost of the photocatalyst is reduced, and the repeated utilization rate of the photocatalyst is improved.

The invention relates to a preparation of a TCH / HNTs / PLGA nanometer composite fibre medicine carrying system, comprising the following steps of: (1) taking the model medicine of tetracycline hydrochloride in phosphate buffer, heating, stirring, dissolving and cooling; (2) taking halloysite nanotubes to mix with the TCH solution for ultrasonic dispersion, placing in a vacuum drying box, vacuumizing, centrifuging, taking out the supernate, washing and precipitating to obtain HNTs carried with TCH; (3) drying, grinding and filtering the HNTs carried with TCH; and (4) dissolving PLGA in TMF / DMF solvent, standing, adding the powder obtained in the step (3) in the PLGA solution for ultrasonic dispersion to prepare electrostatic spinning solution, and then preparing the nanometer fibre felt by the regular electrostatic spinning method. The invention is simple and easy to operate; the mechanical strength of the fibre felt mixed with HNTs is obviously improved; and the dual-carrier medicine carrying system of HNTs / PLGA has favorable medicine continuous releasing effect.

The invention discloses a method for preparing novel carbon quantum dot / flower-shaped indium and calcium sulfide (CQDs / CaIn2S4) composite photocatalysts, and belongs to the field of environmental protection. The method includes preparing the CQDs / CaIn2S4 composite photocatalysts by the aid of in-situ hydrothermal processes at certain temperatures. The CQDs / CaIn2S4 composite photocatalysts prepared by the aid of the method can be applied to catalytically degrading tetracycline hydrochloride solution under the sunlight or visible light. The method has the advantages that the method includes simple technologies, is free of pollutant discharge in preparation procedures and is short in preparation period and low in energy consumption and cost, is a green synthesis technique, and the carbon quantum dot / flower-shaped indium and calcium sulfide composite photocatalysts can be prepared on a large scale; the visible light response and the adsorption capacity of the carbon quantum dot / flower-shaped indium and calcium sulfide composite photocatalysts can be improved after CQDs (carbon quantum dots) are compounded, the service lives of electrons-holes can be prolonged, photoelectron transmission can be promoted, and the visible light photocatalytic activity of the carbon quantum dot / flower-shaped indium and calcium sulfide composite photocatalysts can be greatly improved.

The invention discloses a responsive chitosan microsphere / cellulose hydrogel drug-loading composite membrane and preparation thereof. The preparation includes: preparing chitosan microspheres that load tetracycline hydrochloride which is an antibacterial drug; dispersing the prepared chitosan microspheres and 5-fluorouracil evenly in three-dimensional network structure formed by crosslinking carboxymethyl cellulose and cystamine dihydrochloride, wherein 5-fluorouracil is an anticancer drug. The responsive chitosan microsphere / cellulose hydrogel drug-loading composite membrane has good biocompatibility and reduction response, can release tetracycline hydrochloride and 5-fluorouracil in controlled manner in cancer tissue areas, and has antibacterial and anticancer functions.

The invention relates to a magnetic graphene oxide composite material for removing tetracycline hydrochloride in an aqueous solution and a preparation method thereof. The magnetic graphene oxide composite material is prepared by mixing graphene oxide and Fe3O4 nano particles according to a mass ratio of (2 to 1)-(1 to 2). The magnetic graphene oxide composite material is more environmentally friendly and is capable of effectively removing tetracycline hydrochloride in the aqueous solution. The Fe3O4 nano particles are compounded with graphene oxide to obtain the magnetic graphene oxide composite material which is an adsorption material; the material is capable of effectively adsorbing and removing tetracycline hydrochloride in the aqueous solution; the magnetic effect of the material is capable of ensuring that the adsorbent material is effectively separated from the adsorbed and treated aqueous solution; meanwhile, the problem of secondary pollution caused when graphene oxide is usedas the adsorbent is solved.

The invention belongs to the technical field of photocatalytic material synthesis, and particularly relates to a composite photocatalyst and its preparation method and an application. The composite photocatalyst can be applied to degrade tetracycline hydrochloride pollutant under the visible light. The preparation method includes steps of exactly weighing hexahydrated ferric trichloride in ethylene glycol and stirring to obtain solution A; adding sodium acetate in solution A to form solution B; adding g-C3N4 in the solution B, and stirring to form solution C; transferring the solution C to a reaction kettle; reacting for 6 hours in an oven at 200 DEG C; after naturally cooling to room temperature, centrifuging, washing and drying to obtain a sample.

The invention discloses a preparation method of a cesium lead bromide quantum dot / carbon nitride nanosheet photocatalyst. The preparation method comprises the following steps: 1, preparing cesium leadbromide quantum dots by an anti-solvent process; 2, preparing a bulk phase graphite phase carbon nitride powder through recrystallization and thermal polycondensation of polyurea; and 3, adding the cesium lead bromide quantum dots while ultrasonically stripping the bulk phase graphite phase carbon nitride to prepare the cesium lead bromide quantum dot / carbon nitride nanosheet photocatalyst material in one step. The cesium lead bromide quantum dot / carbon nitride nanosheet photocatalyst is prepared by simple one-step ultrasonication, and the obtained composite photocatalyst material has good water stability, and overcomes the defect of instability the cesium lead bromide quantum dots in water. The composite photocatalyst improves the utilization rate of visible lights and inhibits the recombination of photogenerated electrons and holes, so the composite photocatalyst can efficiently photocatalyze the degradation of tetracycline hydrochloride in water under the irradiation of visible light.

The invention belongs to the technical field of synthesis of a photocatalyst, and especially relates to a Fe2O3 / g-C3N4 composite system and a preparation method and an application thereof, which can be used for catalytic degradation of tetracycline hydrochloride pollutants by visible light. The method comprises the following steps: accurately weighing P123 and hexamethylene imine, dissolving the materials in a mixed solution of absolute ethyl alcohol and ethylene glycol, and stirring the materials to obtain a solution A; accurately weighing tetrahydrate ferrous chloride, and adding tetrahydrate ferrous chloride in the solution A and performing ultrasonic dissolving to form a solution B; adding mesoporous g-C3N4 in the solution B to form a fluid suspension C; performing ultrasonic dissolving and magnetic stirring on the fluid suspension C to obtain turbid liquid D; transferring the turbid liquid D to a reaction vessel, and reacting the materials in a baking oven at the temperature of 200 DEG C for 15 h; naturally cooling the materials to room temperature, and performing centrifugation, washing, and drying to obtain a solid F; and placing the solid F in a crucible, and placing the materials in a muffle furnace for calcining to obtain a sample.

The invention relates to a method for preparing a standard substance for detecting antibiotics in cosmetics. The standard substance is formed by mixing aqueous solution of the antibiotics or solution of propylene glycol and cosmetic cream, wherein the cosmetic cream comprises the following components in percentage by weight: 73 to 78 percent of de-ionized water, 3 to 3.5 percent of propylene glycol and 0.2 to 0.25 percent of carbomer in phase A, 4.5 to 5 percent of stearate, 3 to 4 percent of cetyl alcohol and stearyl alcohol and 10 to 14 percent of 26# white oil in phase B and 1.2 to 1.25 percent of phenoxyethanol and ethylhexylglycerin in phase C; and the concentration of the antibiotics in the standard substance reaches 0.1g / 100mL. The method has the advantages that: the antibiotics and the cosmetic cream are mixed to form the standard substance for detecting the antibiotics such as minocycline hydrochloride, oxytetracycline dehydrate, tetracycline hydrochloride, chlortetracycline hydrochloride, doxycycline hydrochloride and chloramphenicol in the cosmetic; and the standard substance is the same as a sample of the cosmetic containing the antibiotics in the actual use; thus the detection of the antibiotics in the cosmetic conforms to the state of the actual application better and is more accurate.

The invention relates to a method for measuring a residual solvent in a tetracycline hydrochloride bulk drug by utilizing headspace gas chromatography. The method comprises the following steps of: preparing tetracycline hydrochloride into a solution and placing the solution into a headspace bottle; heating the solution, and volatilizing a volatile organic solvent from the solution; after balance is achieved, taking a gas at the upper part in the headspace bottle, and injecting the gas into a gas chromatograph for separation and measurement. The method for measuring the residual solvent in the tetracycline hydrochloride bulk drug by utilizing headspace gas chromatography can prevent solid tetracycline hydrochloride from remaining at an injection port of a gas chromatographic column, the chromatographic column can not be affected, thus the service life of the chromatographic column is prolonged, also the interference factors are less, the measured result is accurate, and the detection limit is high because of great sample size.

The invention relates to a method for preparing high-purity tetracycline hydrochloride. Tetracycline urea double salt and hydrochloric acid serve as raw materials, and reaction of the tetracycline urea double salt and hydrochloric acid and crystallization of tetracycline hydrochloride are simultaneously performed. The method comprises the following steps of: mixing the double salt with an organic alcohol mixed solvent according to a ratio, adding hydrochloric acid at the temperature of 5-20 DEG C, continuously stirring and filtering; transferring the filtrate into a crystallizer, raising the temperature, adding a seed crystal when the system temperature reaches 27-32 DEG C, further raising the temperature to 40-50 DEG C, and growing the grain at constant temperature; reducing the temperature of the suspension to 5-20 DEG C; and filtering, washing and drying the obtained crystal mush, thereby obtaining a tetracycline hydrochloride crystal product. The reaction and crystallization processes in the solvent system are screened and optimized, the tetracycline hydrochloride crystal which is uniform in particle size distribution, zero in coalescence and complete in crystalline form and has the purity of more than 98.0 percent is obtained, and the process yield is more than 88.0 percent. The problems that the product is non-uniform in particle size distribution and severe in coalescence so that the purity of the product is reduced are solved, and the product quality is obviously improved.

The invention belongs to the technical field of nanometer material synthesis and relates to a "Z-Scheme" Co3O4 / g-C3N4 composite system which is synthesized by one step by using a simple and rapid hydrothermal method and can be used for degrading tetracycline hydrochloride under visible light, wherein the surface of g-C3N4 is modified by a mesoporous Co3O4 nanosphere composed of monocrystal nanodots in the system. A sample is prepared by the steps: firstly, preparing g-C3N4 for later use; and then, controllably preparing the "Z-Scheme" Co3O4 / g-C3N4 composite system, accurately weighing a certain quantity of cobaltous nitrate hexahydrate and cetyltrimethyl ammonium bromide, dissolving cobaltous nitrate hexahydrate and cetyltrimethyl ammonium bromide into a mixed solution of deionized water and methanol, then, adding g-C3N4, carrying out magnetic stirring for 24h after carrying out ultrasonic dispersion for 30min, then, transferring a suspension liquid into a 50ml high-pressure reactor, carrying out reaction in a baking oven at 180 DEG C for 24h to obtain a dark yellow sediment, and then, carrying out centrifuging, cleaning and drying.

The invention provides a photocatalytic composite material with p-n heterojunction, and belongs to the field of organic pollutant treatment. The narrow-band-gap photocatalytic composite material withp-n heterojunction disclosed by the invention improves deficiency of a single catalyst, has a small band gap energy (1.87 eV), has a large absorption threshold on visible light, and has enhanced lightutilization efficiency. The p-n heterojunction caused by bending of the energy band increases the hole transfer ability, inhibits electron-hole recombination, improves the separation efficiency of photogenerated electrons and holes, prolongs the carrier lifetime and enhances the catalytic activity. Under visible light, the photocatalytic composite material has good degradation effects on organicpollutants in water, such as MO, MG, BPA, tetracycline hydrochloride, etc. At the same time, the narrow-band-gap photocatalytic composite material with p-n heterojunction disclosed by the invention can settle in water through standing, so that the narrow-band-gap photocatalytic composite material can be separated from an aqueous solution, and thus the narrow-band-gap photocatalytic composite material is beneficial to recovery and reuse of materials, has good regenerative capacity and can be recycled.

The invention relates to modification of multi-element metal oxide, in particular to a method for preparing an Ag / AgCl / AgBi(MoO4)2 plasma photocatalyst by taking sodium chloride, silver nitrate, bismuth nitrate and sodium molybdate as raw materials. The method comprises the following steps: taking the silver nitrate and the bismuth nitrate with equivalent substance amounts, and dispersing the silver nitrate and the bismuth nitrate into deionized water; then adding a sodium molybdate aqueous solution, stirring and mixing, then carrying out microwave hydrothermal reaction, and alternately cleaning obtained precipitation by using ethanol and the deionized water for three times; carrying out ultrasonic dispersion on obtained AgBi(MoO4)2 into ethylene glycol, adding sodium chloride of different substance amounts, and continuously stirring for 4 hours and carrying out photoreduction reduction; after the reaction is ended, filtering, washing and drying the precipitation to obtain the Ag / AgCl / AgBi(MoO4)2 plasma photocatalyst. An experiment of degrading tetracycline hydrochloride (TC) under visible light proves that the prepared composite photocatalyst has good photocatalytic activity.

The invention discloses preparation and application of a palygorskite / graphite phase carbon nitride compound composite material. The preparation method of the pal / g-C3N4 composite material includes: subjecting palygorskite to ultrasonic dispersion in distilled water, adding dicyandiamide and mixing the substances evenly, and then performing ultrasonic treatment for 0.5-1h; conducting heating to 45-50DEG C, and further performing stirring till complete dryness by evaporation, conducting grinding into powder, placing the product in a muffle furnace, and conducting calcination at 520-550DEG C for 3.5-4h; performing cooling to room temperature, and then conducting grinding into powder, thus obtaining the pal / g-C3N4 composite material. The invention adopts water bath method to compound dicyandiamide and palygorskite to successfully prepare the pal / g-C3N4 composite material, the catalytic activity of g-C3N4 is combined with the adsorption performance of palygorskite, and the two substances cooperate to enhance the light absorption intensity of the composite sample, thus improving the photocatalytic efficiency, and reaching the effect of efficient removal of pollutants. Experiments show that the composite catalytic material has high catalytic oxidation rate on tetracycline hydrochloride, and the total removal rate reaches 85%.

The invention provides a preparation method and application of hollow spherical NiFe2O4@ N-C, and belongs to the field of adsorbing materials. According to the product, N-doped carbon composite hollowspheres (NCHSs) as a template is compounded with Ni(NO2)2 6H2O, Fe(NO3)3 9H2O, sodium citrate, NH4F and urea as raw materials to prepare the NiFe2O4@N-C nanometer spheres with a hollow structure, wherein the NiFe2O4@N-C nanometer spheres are formed through aggregation of nanosheets, and the diameter of the NiFe2O4@N-C nanometer spheres is 200-300 nanometers. The hollow NiFe2O4@N-C nanometer spheres are high in degree of crystallinity, perfect in crystal form and capable of adsorbing tetracycline hydrochloride. Besides, the hollow NiFe2O4@N-C nanometer spheres have excellent magnetic performance and can be recycled. Through the test results of the embodiment, it can be known that when the hollow spherical NiFe2O4@ N-C as the adsorbing material is used for adsorbing the tetracycline hydrochloride, the maximal adsorption capacity is 271.739 mg / g; moreover, through cyclic tests, it can be known that the adsorbing agent is high in recycling ability and high in stability and has a practicalapplication value.

A preparation method of nano composite MoS2 / Ag / TiO2 NTs is characterized in that according to the principle, a titanium mesh is used as a base, and integrated MoS2 / Ag / TiO2 NTs is grown in situ on theTiO2 NTs / Ti mesh via simple photo-reduction and hydrothermal processes; when exposed to visible light (gamma> / =420 nm), the catalyst MoS2 / Ag / TiO2 NTs on the titanium mesh 4 cm<2> can substantially degrade 100 mL of 10 mg / L tetracycline hydrochloride solution within 2 hours. The preparation method has the advantages that the composite is prepared on the titanium mesh, the problem with catalyst immobilization is solved, the composite is convenient and quick to use and convenient to recycle and reuse, catalytic activity of the composite rarely fails, the composite may also be connected with an external circuit, and bias voltage helps improve photo-induced electron-hole separation efficiency so that catalytic efficiency of the composite is improved.

The invention discloses a preparation method and application of a loofah sponge biomorphic supported nitrogen-doped carbon nanotube coated iron nanoparticle Fenton-like catalyst, relates to a preparation method and application of a Fenton-like catalyst, and aims to solve the problems of easy agglomeration of active components, ion leaching, slow Fe < 3 + > / Fe < 2 + > conversion under a neutral condition and poor cycling stability of the existing Fenton-like catalyst. The method comprises the following steps: 1, preparing dried loofah sponge with the particle size of 8-10mm; 2, alkalization treatment; 3, precipitating Fe < 3 + > on the surface of the loofah sponge; 4, doping a nitrogen source; 5, carrying out pyrolysis; 6, cleaning and drying. The loofah sponge biomorphic supported nitrogen-doped carbon nanotube coated iron nanoparticle Fenton-like catalyst is used for degrading tetracycline hydrochloride in sewage. The method is suitable for degrading antibiotics.

The invention belongs to the field of inorganic nanometer materials and relates to a preparation method of a ZnO-loaded CdIn2S4 nano-cube composite catalyst and the application of the catalyst to the field of environmental governance. CdIn2S4 nano-cubes are synthesized by using cadmium nitrate tetrahydrate, indium nitrate monohydrate and thioacetamide as raw materials, and a ZnO-loaded CdIn2S4 nano-cube compound is synthesized through deposition and a hydrothermal method. The composite material has the advantages of large specific surface area, wide spectral response range, strong light-harvesting ability, convenience in separation of photon-generated carriers and the like and has very excellent solar photocatalytic degradation ability. A synergistic effect can be used in the ZnO-loaded CdIn2S4 nano-cube composite material, effective transfer and separation of the photon-generated carrier are realized, the light absorption range of the compound is widened, and effective degradation of tetracycline hydrochloride and ofloxacin by the compound under solar light is realized.

The invention relates to a preparation technology avoiding reduction of tetracycline hydrochloride technical original drug property. The preparation technology comprises the following steps that a tetracycline hydrochloride wet product is prepared; the prepared tetracycline hydrochloride wet product is dried and ground into powder. A preparation technology of tetracycline hydrochloride comprises the steps that reagent bottles used for containing the tetracycline hydrochloride powder are cleaned firstly; then the tetracycline hydrochloride powder is quantitatively filled into the cleaned reagent bottles according to specifications, and nitrogen is fed into the bottles; the bottles are covered with pretreated rubber plugs, and then cap binding treatment is conducted through aluminum caps to make products sealed; inner tags sticking, packing and light inspection are sequentially conducted on the reagent bottles which are subjected to cap binding; then outer tags stick to packing boxes, and inspection and packing are conducted. By means of the preparation technology avoiding reduction of the tetracycline hydrochloride technical original drug property, the problem that the effect of a tetracycline hydrochloride technical original drug for injection is prone to reduction by means of an existing preparation technology of the tetracycline hydrochloride is solved.

The invention discloses a preparation method of chitosan-based medicine-carrying flexible sponge. The method comprises the following steps: taking chitosan as raw material, dropwisely adding a precipitant sodium hydroxide to obtain chitosan gel precipitate in the process of continuously stirring an acetic acid solution of chitosan, centrifugally cleaning the chitosan gel precipitate, and then mixing the chitosan gel precipitate with a cross-linking agent of oxidizing carboxymethyl cellulose, a plasticizer glycerol and an antibacterial drug tetracycline hydrochloride, and freeze-drying the castfilm to obtain the medicine-carrying flexible sponge body. According to the invention, the chitosan gel precipitate prepared by acid-base titration is used for preparing the sponge body, and the stability of the sponge obtained by freeze-drying is good, and the structure is not damaged when swelling is caused, and one-step molding is carried out, and the structure collapse caused by alkali washing and secondary freeze-drying is avoided, and because of the one-step molding, the chitosan-based medicine-carrying flexible sponge is convenient to carry medicine. According to the invention, glycerol is added as a plasticizer, so that the sponge is soft and elastic. The method has the advantages of short process period, simple and convenient process, low cost and suitability for commercial production.

The invention relates to a preparation method of an iron vanadate loaded cotton fabric, and belongs to the field of material preparation. The preparation method is characterized by comprising the following steps: wetting a cotton fabric with deionized water, placing the wet cotton fabric in an ethanol-water system, carrying out ultrasonic treatment, taking out the cotton fabric, washing the cottonfabric with deionized water, and drying the cotton fabric for later use; adjusting the pH value in a three-necked flask filled with the ethanol-water system, adding a silane coupling agent, and fullyhydrolyzing the silane coupling agent by ultrasonic treatment; adding iron vanadate powder, and continuously carrying out surface modification on the iron vanadate by ultrasonic treatment; then adjusting the pH value of the system by using a sodium hydroxide solution, putting the three-necked flask into an oil bath, and drying the cotton fabric, which is wetted by deionized water and dried by extruding, under mechanical stirring; and then washing the cotton fabric with water and drying the cotton fabric to obtain the iron vanadate loaded cotton fabric. The silane coupling agent KH560 is usedas an important medium to enable iron vanadate and cotton fabric to be firmly bonded, a novel catalyst namely iron vanadate / cotton fabric is successfully prepared by impregnation, and iron vanadate isuniformly distributed on the surface of the fabric and has good catalytic degradation performance for tetracycline hydrochloride.

The invention belongs to the field of nano-materials, and relates to a preparation method of a tungsten oxide / bismuth oxybromide composite material. The method comprises the following steps: weighing a certain amount of Bi24O3Br10 powder, adding a certain amount of deionized water, and carrying out ultrasonic treatment and stirring to uniformly disperse the powder in order to obtain a suspension 1; weighing a certain amount of WO3 powder, adding a certain amount of deionized water, and carrying out ultrasonic treatment and stirring to uniformly disperse the WO3 powder in order to obtain a suspension 2; mixing the two suspensions, and stirring the suspensions for 8-12 h to obtain a suspension 3; transferring the suspension 3 into a reaction kettle provided with a polytetrafluoroethylene liner, placing the reaction kettle in an oven, and carrying out a hydrothermal reaction; and naturally cooling the reaction kettle to room temperature, centrifuging the obtained reaction product to obtain a yellow solid precipitate, washing the precipitate, drying the washed precipitate, taking out the dried precipitate, and grinding the precipitate in a mortar to form powder for later use. The above prepared composite photocatalyst can effectively catalyze the degradation of an antibiotic tetracycline hydrochloride under visible light irradiation, and has a potential application prospect in antibiotic wastewater treatment.

The invention discloses a preparation method and application of a photocatalyst, and belongs to the field of photocatalysis. According to the preparation method, guanidine hydrochloride, ammonium chloride and bismuth nitrate are used as raw materials, and high-energy ball milling treatment is carried out in a closed container under a protective gas atmosphere, then roasting is carried out, and theBiOCl / g-C3N4 layered heterojunction photocatalyst is synthesized. The preparation method disclosed by the invention is simple in steps, the obtained catalyst is good in stability, and the degradationrate of tetracycline hydrochloride and / or cefradine in water through the use of the obtained catalyst is up to 99% or above. In the method disclosed by the invention, no solvent is used, so that themethod is environmentally friendly, economic and practical, meets the actual production requirements, and can be popularized and used in a large scale.