577 results about "Microfiltration membrane" patented technology

The invention discloses an alumina-based catalytic ceramic membrane loaded with high-content ferric oxide as well as a preparation method and application of the alumina-based catalytic ceramic membrane, and belongs to the technical field of inorganic functional ceramic microfiltration membranes and preparation of the inorganic functional ceramic microfiltration membranes. The invention solves the problems that the catalytic action of the existing catalytic ceramic membrane is limited by low catalyst loading capacity, the preparation process is complicated, the cost is high and the like. When the aluminum oxide-based ceramic membrane is prepared, silicon dioxide is added to generate a liquid phase in the sintering process to promote sintering, the catalyst alpha-Fe2O3 is added into the ceramic powder before sintering, the ceramic membrane with the catalytic function is prepared in a one-step forming and co-sintering mode, the preparation process is simplified, and meanwhile the preparation cost is reduced. The content of alpha-Fe2O3 on the surface and in the ceramic membrane is increased, and Fe < 3 + > is utilized to activate crystal lattices to promote sintering. Along with the increase of the addition amount of alpha-Fe2O3, small pores are discharged in the sintering process, pore walls are shrunk, macropores are generated, the pore diameter of the ceramic membrane is gradually increased, and the permeation flux of the ceramic membrane is improved.

The present disclosure relates to embodiments of a method for manufacturing a ceramic material comprising the steps of (a) homogenizing aluminum oxide, niobium pentoxide and solvent; (b) ultrasonicating the blend obtained in step (a); (c) adding an aliquot of the prepared suspension to the empty cavity of a mold, particularly between the polymeric mold and the metal mold; (d) immersing the mold into a coolant liquid-containing bath for sufficient time to ensure that all parts are completely frozen; (e) removing the ceramic body from the mold; (f) removing the solidified phase by means of sublimation hence obtaining a green tube; and (g) sintering the green tube, so as to obtain a solid structure. The present disclosure further relates to embodiments of a ceramic material and its use to manufacture a microfiltration membrane and / or a membrane support for fluid separation.

The utility model discloses a microfiltration purification separation device for yeast hydrolysis biological enzyme liquid, which belongs to the technical field of biological enzyme separation. The microfiltration purification separation device for yeast hydrolysis biological enzyme liquid comprises a treatment box, a cover plate is detachably installed on the top of the treatment box, a liquid inlet pipe is installed on the top of the cover plate, the top of the treatment box is open, the liquid inlet pipe is connected to the treatment box, the bottom of the treatment box is fixedly connected with a discharge pipe connected thereto, and a separation component is arranged inside the treatment box; the separation component comprises a separation barrel and a motor, the separation barrel is located in the inner cavity of the treatment box, the scheme controls the separation barrel to rotate by a motor, the liquid inside the separation barrel performs centrifugal motion, and the liquid is microfiltered and separated by a microfiltration membrane, while the separation barrel rotates, the microfiltration membrane can be continuously vibrated and deformed, particles and impurities on the microfiltration membrane can be effectively removed, the risk of blockage is reduced, and the microfiltration separation efficiency is improved.

The utility model provides a mercury-containing organic wastewater treatment device in a Tibetan medicine processing process. The mercury-containing organic wastewater treatment device comprises a raw water tank, a micro-filtration membrane treatment unit, an electro-catalysis pretreatment unit, a mercury capturing and separating unit and a high-precision filtering unit which are sequentially connected, and the electro-catalysis pretreatment unit is further connected with a comprehensive waste gas purification unit; the mercury capture and separation unit comprises a chalcogenide reaction tank, a PAM reaction tank and a clarification tank which are communicated in sequence; the chalcogenide reaction tank is connected with a chalcogenide dosing device; and the PAM reaction tank is connected with a PAM dosing device. According to the utility model, the processes of filtration, electro-catalysis pretreatment, heavy metal capture, targeted adsorption and solid-liquid separation are adopted to treat a large amount of high-mercury, high-chromaticity, high-suspended-matter and high-COD wastewater generated in the Tibetan medicine zogtai processing process, so that the organic matter content of a water sample can be greatly reduced, the chromaticity of water is reduced, the suspended matter in water is removed, and the mercury concentration in water is reduced.

The preparation method comprises the following steps: selecting an abrasive material base material, mixing the abrasive material base material with a silane coupling agent for chemical modification, coating the surface with a modified abrasive material with a functional layer, adding the modified abrasive material into a stirring container, and dispersing to obtain the rough polishing liquid applied to the diamond substrate. An oxidizing agent and a dispersing agent are added into the abrasive dispersion liquid to be stirred to form a polishing solution, the particle size distribution condition of the modified abrasive in the polishing solution is monitored in real time through an online particle size analyzer, and the ultrasonic power and the treatment time are automatically adjusted; adding a pH regulator into the polishing solution by adopting a step-by-step titration method, and adjusting the pH value to 6-9; the polishing solution is filtered through a micro-filtration membrane, undispersed particles and impurities are removed, and a polishing solution finished product is obtained; through the chemical modification and ultrasonic-assisted technology and the real-time monitoring and automatic adjusting process, the dispersity of the grinding material and the uniformity of the polishing solution are remarkably improved, and the particle size distribution of the grinding material is optimized, so that the high-quality polishing solution is obtained.

The invention discloses a preparation method of a super-hydrophilic PVDF (polyvinylidene fluoride) microfiltration membrane, belongs to the technical field of filter membrane processing, and is used for solving the technical problem that the hydrophilic performance and flux of a microfiltration membrane in the prior art need to be further improved. The preparation method comprises the following steps: putting modified PVDF, acetone, N, N-dimethylformamide and an auxiliary additive into a reaction kettle, and uniformly mixing to obtain a mixed solution; the preparation method comprises the following steps: preparing modified polyolefin from modified graphene and ethylene-co-maleic anhydride, carrying out a polymerization reaction on the modified polyolefin and PVDF subjected to a dehydrogenation fluorination reaction to obtain modified PVDF, preparing a membrane from the modified PVDF, a solvent and an auxiliary additive through a phase inversion method, and further carrying out dipping treatment to obtain the PVDF / PVDF composite membrane. The hydrophilic performance and flux of the PVDF micro-filtration membrane are improved, and the mechanical performance of the PVDF micro-filtration membrane is also improved.

The invention discloses a preparation method for preparing a biological fertilizer by using valine fermentation liquor, and relates to the technical field of biological fertilizer preparation, and the preparation method has the advantages that large-particle impurities and suspended solids are effectively removed by pretreating the valine fermentation liquor and using a ceramic microfiltration membrane, so that a foundation is laid for subsequent purification; then, a special adsorption material is adopted, mesoporous silica is used as a basis, after amino functional groups are introduced through surface modification, the chemical property of the adsorption material is changed, the affinity to valine is enhanced, a polymerization reaction is performed under the action of an initiator to form a polymer network, then the template molecule valine is removed, and the adsorption material is prepared. According to the present invention, the high-purity valine solution is added to the valine solution, such that the identification site complementary to the shape, the size and the chemical function of the valine is left, the valine can be accurately identified and adsorbed, the separation purification effect of the valine is substantially improved, and the accuracy and the stability of the fertilizer nutritional components can be effectively ensured when the obtained high-purity valine solution is mixed with other nutrients.

The invention relates to the technical field of rural domestic sewage filtration, and discloses a rural domestic sewage filtration treatment device which comprises a treatment tank, the surface of the treatment tank is communicated with a water inlet pipe, one end, away from the water inlet pipe, of the treatment tank is communicated with a transmission pipe, the surface of the treatment tank is fixedly connected with a hydraulic rod, and the top of the hydraulic rod is fixedly connected with a linkage plate. The device further comprises a permeation component, and the permeation component comprises three frames. According to the rural domestic sewage treatment device, rural domestic sewage is conveyed into the treatment tank through the water inlet pipe, the ultrafiltration membrane can filter the sewage entering the treatment tank, large particles in the sewage are intercepted through the ultrafiltration membrane, the sewage is filtered for the second time through the microfiltration membrane, and the sewage can be discharged through the microfiltration membrane. The nanofiltration membrane can perform third filtration treatment on the sewage, and the microfiltration membrane and the nanofiltration membrane are used for performing separation treatment on impurities such as bacteria in the sewage, so that multiple filtration operation on the sewage is realized.

The invention discloses preparation of a functionalized GO membrane electrode and application of the functionalized GO membrane electrode in removal of perfluorinated compounds through coupled alternating current catalysis, and the preparation method of the functionalized GO membrane electrode comprises the following steps: performing ultrasonic treatment on a graphene oxide dispersion liquid, adjusting the pH value to be alkaline, adding a functional reagent 1 which is a low-valence titanium oxide or a high-conductivity CNTs material, performing hydrothermal reduction reaction after uniform ultrasonic treatment, and obtaining the functionalized GO membrane electrode. A functional reagent 2 is added into the obtained dispersion liquid, the functional reagent 2 is a compound with imino groups or quaternary ammonium salt, the reaction liquid obtained after the reaction is subjected to suction filtration through a vacuum suction filtration method to a micro-filtration membrane serving as a support, and the functionalized GO membrane electrode is obtained. The functionalized GO membrane electrode prepared by the method disclosed by the invention is applied to an alternating-current electrochemical system, no medicament needs to be added, and the process is simple, economical and environment-friendly. The electrode material is good in stability and high in conductivity, a large number of active species are provided for the catalytic degradation process, degradation products are low in toxicity, and degradation of perfluorinated compounds can be rapidly and efficiently achieved.

The invention belongs to the technical field of iron ion detection, and particularly relates to a rapid detection method for ferric ions in water, which comprises the following steps: a fluorescent probe preparation step: taking trihydrate of copper nitrate and tryptamine, adding into a centrifuge tube in sequence, adding ultrapure water, performing ultrasonic dissolution, transferring into a high-pressure reaction kettle, and performing hydrothermal reaction to obtain a fluorescent probe; cooling to room temperature, centrifuging the obtained yellow green solution in a centrifugal machine, and filtering the supernate through a microfiltration membrane to obtain a copper-doped carbon quantum dot CuCDs stock solution, namely the fluorescent probe; analyzing and determining Fe < 3 + >: taking the diluent of the prepared CuCDs solution, adding the diluent into a centrifugal tube containing a Fe < 3 + > standard solution, uniformly mixing, carrying out fluorescent quantitative analysis and detection, and exploring the change rule of the fluorescence intensity ratio of CuCDs; according to the rapid detection method for Fe < 3 + > provided by the invention, the synthesized CuCDs have high sensitivity, can realize on-site rapid detection of Fe < 3 + > in a water medium, and shows a wide application prospect in the field of environmental monitoring.

A hollow fiber filter membrane, and a preparation method therefor and the use thereof, which relate to the technical field of separation membrane materials. By using in-situ gas generation combined with ultrasonic-assisted phase separation technology, and by means of adjusting the ratio of each component in spinning dope, core liquid and coagulation bath formulations and adjusting a spinning process, a hollow fiber filter membrane having a unique structure and surface morphology is obtained. The cross section of the hollow fiber filter membrane is of an asymmetric gradient sponge-like pore structure, with the pore size increasing first and then decreasing from the inside to the outside. The inner surface has smooth and loosely arranged slit-shaped pores, and the outer surface has round pores. The membrane has a PMI pore size of 0.1-0.45 μm, and is a microfiltration membrane. The membrane has a water flux of up to 300-650 LMH@Psi and a low shear force during tangential flow filtration, and exhibits a good anti-fouling performance, strong alkali resistance, good biocompatibility, and adequate mechanical properties for use.

The invention provides a flexible MOF (Metal Organic Framework) microfiltration membrane as well as a preparation method and application thereof, and belongs to the technical field of polymer composite membranes. In the flexible MOF microfiltration membrane provided by the invention, the polymer nanofiber membrane formed by the polymer nanofibers has a relatively large specific surface area, so that the flexible MOF microfiltration membrane has a relatively large contact area with pollutants; meanwhile, the defective MOF particles are uniformly distributed on the surface of the polymer nanofiber of the polymer nanofiber membrane, and the defective MOF nanoparticles provide abundant active sites, so that the adsorption capacity to pollutants can be improved. The result of the embodiment shows that compared with MOF particles, the flexible MOF microfiltration membrane provided by the invention has the advantages that the phosphate adsorption capacity is enhanced by about 50%, and the terephthalic acid leaching rate in the adsorption process is reduced from 12.0% to 0.3%.

The invention belongs to the technical field of radioactive wastewater treatment and uranium extraction from seawater, and discloses a high-flux cellulose immobilized tannin membrane adsorption material as well as a preparation method and application thereof. The membrane adsorption material comprises an aldehyde cellulose acetate microfiltration membrane and waxberry tannin which is cured on the microfiltration membrane through gradient cross-linking. The membrane adsorption material provided by the invention keeps a reticular porous structure of a cellulose microporous filter membrane and has the characteristics of high flux and rapid mass transfer, the pure water flux of a single-layer membrane can reach 300 L / (m.h), the treatment capacity of a multi-layer membrane is remarkably increased, large-flow treatment can be realized, and the efficiency of extracting uranium from seawater or uranium-containing wastewater is remarkably improved.

The invention relates to the technical field of carbon nanotubes, and particularly discloses a purification method of a carbon nanotube. The purification method of the carbon nano tube comprises the following steps: (1) weighing a carbon nano tube crude product and various raw materials, (2) adding the carbon nano tube crude product and a surfactant into deionized water, and carrying out ultrasonic dispersion to obtain a dispersion liquid, (3) carrying out gradient centrifugation on the dispersion liquid, and taking an upper-layer suspension liquid, and (4) mixing hydrochloric acid, nitric acid and the suspension liquid, and treating the carbon nano tube to obtain the carbon nano tube. (5) treating the carbon nano tube by dilute acid, mildly oxidizing the carbon nano tube by using a low-concentration hydrogen peroxide solution, and then placing the carbon nano tube in a magnetic field to adsorb magnetic impurities, (6) carrying out cross-flow filtration by using a polycarbonate microfiltration membrane and collecting the treated carbon nano tube, and (7) annealing the treated carbon nano tube by using inert gas and freeze-drying to obtain the purified carbon nano tube. According to the purification method, the metal catalyst, amorphous carbon and graphite impurities can be efficiently removed, and meanwhile, the integrity of the tube wall of the carbon nano tube is kept.

The invention discloses a membrane device for treating electroplating nickel-containing wastewater, which comprises a microfiltration membrane assembly, a reverse osmosis high-pressure pump, a reverse osmosis membrane assembly, a primary concentration high-pressure pump, a primary concentration membrane assembly, a secondary concentration high-pressure pump, a secondary concentration membrane assembly, a connecting pipeline, an instrument panel and a membrane frame, the microfiltration membrane assembly, the reverse osmosis high-pressure pump, the reverse osmosis membrane assembly, the first-stage concentration high-pressure pump, the first-stage concentration membrane assembly, the second-stage concentration high-pressure pump, the second-stage concentration membrane assembly, the connecting pipeline and the instrument panel are all mounted on the membrane frame. The membrane device for treating wastewater is attractive, convenient to operate, small in occupied area and capable of being integrally migrated, a large amount of site construction work is saved, and standardized design and production can be achieved according to different water treatment amounts.

The utility model discloses a device for producing biological stuffing by using a waste microfiltration membrane, which comprises a box body, the side surface of the box body is hinged with one end of a sealing box door, the inside of the box body is fixedly connected with two symmetrical clapboards, the side surfaces of the clapboards are fixedly connected with a placing plate, a plurality of circulating holes are formed in the placing plate, and the side surfaces of the clapboards are fixedly connected with a fan. The bottom of the partition plate is provided with an air outlet. The side face of the box body is fixedly connected with a discharging pipe. The outer side of the discharging pipe is fixedly connected with a valve. The inner wall of the box body is fixedly connected with a temperature sensor. The upper surface of the box body is fixedly connected with a storage box. Through the rotating shaft, the spraying pipe, the stirring blades, the driven gear and the driving gear, nutrients on the microfiltration membrane are more uniform, the uniformity of the nutrients is ensured, precipitation is avoided, through the partition plate, the placing plate, the circulating hole, the fan, the heating rod and the air outlet, hot air is more uniform, the drying efficiency is improved, and the drying effect is improved. And the heat distribution in the box body is more uniform.

Provided are a method for producing ultrapure water, an apparatus for producing ultrapure water, and a system for producing ultrapure water, with which it is possible to sufficiently reduce the number of fine particles such as iron and silica in ultrapure water without using complicated equipment and without significantly reducing the amount of produced water. A method for producing ultrapure water, which comprises filtration treatment using one or more filtration membranes selected from the group consisting of an ultrafiltration membrane (UF), a microfiltration membrane (MF), and an ion exchange membrane, said filtration treatment being performed under conditions satisfying (1) and (2) at the same time. (1) The permeated water flux during filtration is within the range of 0.5-2.0 times the optimal permeated water flux determined by the inter-membrane pressure difference / permeated water flux of the filtration membranes. (2) The water recovery rate in the filtration treatment is 50% or more but less than 80%.

The invention discloses infant formula milk powder with high-activity immune protein and a preparation method of the infant formula milk powder, and belongs to the technical field of preparation of dairy products. The preparation method comprises the following steps: degreasing and degerming fresh milk, transferring lactoferrin phase combination, enriching lactoferrin to a whey phase through filtration of a microfiltration membrane, further desalting and concentrating the whey phase through ultrafiltration and electrodialysis, and forming active whey rich in lactoferrin after sterile concentration; the trapped fluid filtered by the microfiltration membrane is subjected to milk killing (primary sterilization), then is blended with other nutrients, is homogenized, is subjected to material killing (secondary sterilization) and is concentrated, and finally, the treated trapped fluid and the active whey which is subjected to sterile concentration and is rich in lactoferrin are mixed on line and then are subjected to evaporation concentration and spray drying; the infant formula milk powder rich in active whey protein with high lactoferrin content is obtained.

The invention relates to the technical field of oil-water separation, in particular to a waste oil continuous flocculation sedimentation deslagging device which comprises a tank body, the tank body comprises a sedimentation area and a deslagging area, a sedimentation assembly is arranged in the sedimentation area, a quick release structure is arranged between the tank body and the sedimentation assembly, the sedimentation assembly comprises a plurality of inclined plate pieces, and the quick release structure comprises a fixing piece. According to the invention, the ceramic micro-filtration membrane is embedded on the inclined plate, and oil sludge, colloid and asphalt are quickly pulled down and adsorbed on the surface of the inclined plate by adopting a micro-negative pressure technology, so that the oil sludge, colloid and asphalt can be quickly separated from the inclined plate, and the oil sludge, colloid and asphalt can be quickly separated from the inclined plate; when a certain thickness is formed on the surface, the oil sludge slides down to the slag area along with the inclined plate, and the settlement assembly is locked through the matching of the fixing piece and the inserting piece, so that complicated procedures such as screws and bolts are not needed, and the installation is faster and more convenient.

The invention discloses an efficient continuous PET (polyethylene terephthalate) degradation process based on a membrane method technology, which comprises the following steps: mixing an immobilized enzyme compound, a PET raw material to be degraded and a glycine buffer solution to form a reaction solution for degradation, then constructing a'continuous reactor 'by using two size screening membranes, performing primary separation by using an ultrafiltration membrane or a microfiltration membrane, and performing secondary separation by using an ultrafiltration membrane or a microfiltration membrane. A nanofiltration membrane or a reverse osmosis membrane is adopted for secondary separation of the degradation product, automatic separation of the degradation product and a reaction system and automatic purification of the degradation product are achieved, and then the enzymatic degradation efficiency and the product recovery efficiency are improved. Through the construction of the continuous reactor, the automatic PET degradation is realized, so that the costs in the aspects of labor, time, economy and the like are remarkably saved. The undegraded PET and a small amount of exfoliative enzyme can be circulated back to the reaction kettle after being intercepted by the size screening membrane, and the process not only can promote full contact between the undegraded PET and the hydrolase, but also can reduce the loss of the enzyme in the degradation process.

The invention discloses an anaerobic ammonia oxidation membrane biological method and a reactor, and relates to the technical field of sewage treatment.The reaction method comprises the steps that S1, anaerobic ammonia oxidation sludge is inoculated; s2, injecting domestic sewage; s3, domesticating anaerobic ammonium oxidation bacteria; and S4, carrying out intermittent aeration. And stable supply of nitrite in the partial nitrification / anaerobic ammonia oxidation process is realized through intermittent aeration. The reactor comprises a water inlet device, a reactor main body, a membrane assembly, an aeration assembly and a water outlet device, the water inlet device is communicated with the reactor main body, the membrane assembly is arranged in the reactor main body, the membrane assembly comprises a membrane frame and a micro-filtration membrane, the micro-filtration membrane wraps the membrane frame and surrounds to form a filter space, and the filter space is communicated with the water outlet device. The membrane component is used for discharging water, and the micro-filtration membrane has a small pore size, so that microbial sludge can be intercepted in the reactor, sludge-water separation is realized, anaerobic ammonia oxidation sludge in a reaction system cannot be reduced due to water discharging, and 100% of biomass is reserved.

The invention belongs to the technical field of inorganic ceramic membranes, and relates to a preparation method of a high-permeation-flux silicon carbide ceramic microfiltration membrane. Coating a silicon carbide ceramic support with the coating liquid, drying to obtain a silicon carbide ceramic microfiltration membrane blank, and sintering the blank to obtain the silicon carbide ceramic microfiltration membrane with high permeation flux. According to the invention, the silane coupling agent is used as a bonding auxiliary agent of the coating liquid to couple the methyl cellulose and the silicon carbide, so that the viscosity of the methyl cellulose can be enhanced, the dispersity and the film-forming property of the coating liquid can be improved, the coating liquid is stable, only one-time coating is needed, an intermediate transition layer is not needed, and the cost is low. The silicon carbide ceramic microfiltration membrane with high pure water permeation flux can be prepared at a low sintering temperature, and the production time and cost of the silicon carbide ceramic microfiltration membrane are reduced.

The invention discloses a complex-containing electroplating wastewater treatment method, and belongs to the technical field of sewage treatment engineering, and the complex-containing electroplating wastewater treatment method comprises the following steps: S1, introducing complex-containing electroplating wastewater into an adjusting tank for homogenization and impurity removal; s2, carrying out complex breaking treatment on the homogeneous and impurity-removed complex-containing electroplating wastewater through a multi-source catalytic oxidation complex breaking unit; s3, the pH is adjusted, impurities in the complexed electroplating wastewater are moderately precipitated, then the complexed electroplating wastewater is filtered through a coagulation microfiltration membrane assembly, and a metal liquid phase is obtained; s4, after being fed into a resin recovery unit, eluting, and finally recovering valuable metals through an electro-deposition tank or a resin coupling evaporation concentration unit; s5, feeding the wastewater into a guarantee reaction sedimentation tank for oxidation reaction and coagulation reaction to obtain primarily treated wastewater; and S6, mixing the primarily treated wastewater, and treating the wastewater in an evaporation recycling system to obtain standard wastewater and industrial salt. According to the invention, heavy metal complexes in the electroplating wastewater can be effectively broken, and efficient recovery of heavy metals and reuse of wastewater reaching the standard are realized.

The invention relates to a preparation process of a novel Danfit sparkling grape juice, and belongs to the technical field of grape juice preparation. Fully mature, brightly colored, non-rotten and pesticide-free Danfit grape fruits are selected, rinsed in clean water, dried and then the fruit stems are removed; the grapes are crushed after being quickly frozen at low temperature, and the pulp after low-temperature immersion is squeezed using a press to make all the juice flow out; the squeezed juice is first filtered with a filter screen, then put into a sterilized container, a clarifier is added, and naturally clarified at low temperature; the upper clarified liquid is taken and finely filtered through a modified microfiltration membrane; the sugar-acid ratio of the grape juice is adjusted and then homogenized, and then rapidly cooled after ultra-high temperature instantaneous sterilization; the sterilized grape juice is cooled and added to a soda mixer, filled with carbon dioxide, and then poured into a sterilized glass bottle, and sealed and packaged; the novel Danfit sparkling grape juice prepared by the invention contains a high level of proanthocyanidins.

The invention discloses an analysis method for simultaneously analyzing various non-volatile compounds in tea leaves by using UPLC-MS / MS. The method for simultaneously analyzing amino acid, alkaloid, nucleoside and nucleotide non-volatile compounds in tea leaves comprises the following steps: firstly, accurately weighing a tea leaf sample in a centrifugal tube, adding boiling water, uniformly mixing and soaking, and then, carrying out ultrasonic treatment; taking a proper amount of sample, passing through a microfiltration membrane, and putting into a sample injection bottle for detection; secondly, setting instrument conditions: an ultra-high performance liquid chromatography triple quadrupole tandem mass spectrometer, gradient elution: a mobile phase A is chromatographic grade acetonitrile, a mobile phase B is 0.1% formic acid aqueous solution, the flow velocity is 0.200 mL / min, and positive ion scanning is carried out; monitoring multiple reaction ions; the method is high in accuracy, low in detection limit, stable and reliable, and the tea quality is judged by performing data analysis on 43 types of non-volatile compounds such as amino acids, alkaloids, nucleosides and nucleotides in commercially available special-grade Zunyi black tea and physical standard samples through the analysis method.

The invention provides a sebacic acid extraction and purification method and a product, and the method comprises the following steps: (1) filtering fermentation liquor of sebacic acid through a microfiltration membrane to obtain first filtrate; carrying out decoloration treatment, acidification crystallization treatment and solid-liquid separation treatment on the first filtrate to obtain a first solid; (2) mixing the first solid, alkali and water to form a solution, and carrying out decoloration treatment, acidification crystallization treatment and solid-liquid separation treatment on the solution to obtain a second solid; and (3) mixing the second solid with water to form a mixture, carrying out heat preservation treatment on the mixture at 80-115 DEG C, then cooling to 25-45 DEG C for crystallization, and carrying out solid-liquid separation treatment to obtain the product, wherein the temperature of acidification crystallization is 70-120 DEG C, and the heat preservation time is 10-90 min. According to the embodiment of the invention, the quality of the sebacic acid product is improved, and the sebacic acid product is high in purity and low in ash content and nitrogen-containing impurity content.

The invention relates to a synchronous determination method for triazole pesticides in a feed. The method comprises the following steps: S1, preparing a matrix matching series of standard working solutions; s2, extracting a to-be-detected feed sample with acetonitrile to obtain a to-be-purified solution; s3, enabling the to-be-purified solution to completely pass through a Captiva EMR-Lipid solid-phase extraction column, collecting all effluent, fixing the volume by using acetonitrile, uniformly mixing, and enabling the mixture to pass through a microfiltration membrane, so as to obtain a to-be-detected sample solution; and S4, carrying out high performance liquid chromatography-tandem mass spectrometry determination on the matrix matching series standard working solution and the to-be-detected sample solution, and quantifying each to-be-detected medicine by adopting an external standard method. The method provided by the invention is good in extraction and purification effect and high in sensitivity, can realize accurate qualitative and quantitative determination of chlorazophos, tebuconazole, tebuconazole, diniconazole, iminazole, flusilazole and tetraconazole residues in a feed sample with relatively high extraction efficiency and relatively low time cost and economic cost, and can provide technical support for feed quality safety detection.

The invention provides a multistage composite microporous membrane electrode, a preparation method thereof and a water treatment and purification method. The multistage composite microporous membrane electrode comprises an inorganic ceramic microfiltration membrane, an anode electrocatalytic active layer and a cathode electrocatalytic active layer, the anode electrocatalytic active layer and the cathode electrocatalytic active layer are respectively positioned on two sides of the surface of the inorganic ceramic microfiltration membrane; the thickness of the inorganic ceramic microfiltration membrane is 2-6 mm, the thickness of the anode electrocatalytic active layer is 100-800 nm, and the thickness of the cathode electrocatalytic active layer is 1 [mu] m-1 mm; silicite nanocrystals are loaded on the inner walls of pore channels of the inorganic ceramic microfiltration membrane. The particle size of the silica zeolite nanocrystal is 50 to 200 nm. When the multi-stage composite microporous membrane electrode provided by the invention is used for water treatment and purification, oxygen molecules can be efficiently enriched in micropores, the conversion efficiency of hydroxyl radicals is improved, and efficient removal of refractory organic matters is realized.

The invention belongs to the technical field of protein transfer printing, and provides application of a polyvinylidene fluoride microporous filter membrane and a protein immunoblotting method.The surface of the polyvinylidene fluoride microporous filter membrane is provided with spherocrystal and rod-like short fiber crystals and is free of a compact skin layer. According to the application, the polyvinylidene fluoride microfiltration membrane serves as a solid-phase carrier in the western blotting process to conduct high-sensitivity detection on a protein sample with the microgram-level content, and a clear protein band is obtained; the polyvinylidene fluoride microfiltration membrane is prepared by the following method: at a first temperature, dissolving polyvinylidene fluoride in a solvent, adding an additive, mixing to obtain a feed liquid, and cooling the feed liquid to a second temperature to obtain a membrane casting liquid; preparing the membrane casting solution into a liquid membrane; and carrying out steam induced phase separation on the liquid membrane, and then immersing the liquid membrane into a coagulating bath for coagulating and forming to obtain the polyvinylidene fluoride microporous filter membrane. The polyvinylidene fluoride microfiltration membrane prepared by the invention has a good protein transfer printing effect in a protein immunoblotting process, and the detection effect is particularly obviously improved.

The invention discloses a green alga polysaccharide extract for moisturizing spray and a preparation method of the green alga polysaccharide extract, relates to the technical field of plant polysaccharide extraction, and belongs to the patent classification number C08B37 / 00. Comprising the following steps: washing fresh green algae, drying and crushing, adding green algae powder into hot spring water, adding cellulase, pectinase and amylase, heating for enzymolysis reaction, after the enzymolysis reaction is finished, performing enzyme deactivation treatment to obtain enzymatic hydrolysate, filtering the enzymatic hydrolysate through a microfiltration membrane, and collecting microfiltration membrane permeate liquid, thereby obtaining the green algae. And filtering the microfiltration membrane permeate through an ultrafiltration membrane, collecting an ultrafiltration membrane trapped concentrated solution, and drying the ultrafiltration membrane trapped concentrated solution to obtain the green alga polysaccharide extract. According to the method, a membrane technology is adopted, a microfiltration membrane and an ultrafiltration membrane are combined to extract the green algae polysaccharide, the membrane separation and purification process is carried out under the normal temperature condition, the molecular structure of the green algae polysaccharide cannot be damaged, the activity of the green algae polysaccharide is kept, and the method is green, environmentally friendly, energy-saving and consumption-reducing.