149results about How to "Mass transfer rate is fast" patented technology

The invention provides a method for extracting effective constituents from maca. The method includes the following steps that fresh or dry maca roots are taken as raw materials, the maca roots are washed, impurities are removed, an ethyl alcohol-water solution is used as homogenate liquid, the maca roots are homogenized, crushed and extracted, so that a homogenate extracting solution is obtained, filtering is conducted, filtering residues are mixed with an extraction solvent, negative pressure cavitation solid-liquid mixing cyclone extraction is conducted to obtain the extracting solution, the extraction solutions are combined and concentrated, a concentrated solution and a low-level solvent are mixed, then negative pressure cavitation liquid-liquid extraction is conducted, an extracting liquor is obtained, an extract is obtained after concentration, ethyl alcohol is added for redissolving, and thus a solution 1 is obtained; the extracted maca filtering residues are extracted again through hot water, an extracting solution is obtained after filtering, and a solution 2 is obtained after concentration; the solution 1 and the solution 2 are combined and dried, and extractives of the effective constituents of the maca are obtained. The method for extracting the effective constituents from the maca has the advantages that the technological process is simple, the production cycle is short, the effective constituents can be efficiently extracted, products can maintain the original flavor of the maca, used equipment is conventional equipment, production cost is low, and industrial production is easy to achieve.

Hybrid ionic liquid hydrate consists of two types of positive ions containing nitrogen and binary or polybasic carboxylate negative ions which are different in structure and property. One type of positive ions includes protonated alkylamine positive ions, and another type of positive ions inlcudes N,N-dialkyl imidazole positive ions or N, N-dialkyl pyrrole positive ions or N-alkyl pyridines positive ions or N, N, N, N-tetraalkyl ammonium positive ions. Positive ions at one end of binary acid or polybasic acid of the hybrid ionic liquid hydrate have faintly acid while positive ions at the other end are neutral, and binary or polybasic carboxylic acid negative ions have alkalescence, thereby enabling the hybrid ionic liquid hydrate to have ultra-strong pH buffer capacity and to be capable of reversibly absorbing or adsorbing SO2 gas in an environment-friendly high-efficient circulating form. The hybrid ionic liquid hydrate which is utilized as SO2 absorbent is simple in requirements to equipment for absorbing SO2, moderate in operation condition of absorbing and desorbing SO2 and high in desulfuration efficiency without problems of waste liquid and waste water discharge and the like. Further, the invention discloses a process for preparing the hybrid ionic liquid hydrate.

The invention discloses a biological cycle moving bed sewage disposal system and method, which comprises the following steps: entering the raw water into anoxybiotic tank and anaerobic tank with pump from raw water tank; treating; feeding into the cycle moving bed reactor to proceed aeration oxygenation reaction; making the inner section in the tank body of current, inert support filler and bubble be directed with up-and-down cycle splitter, separating splitter and tailboard; forming circulatory flow; reacting the microbe of the current and the inert support filler completely; discharging into desilter; refluxing the depositing sludge in the bottom of the desilter into the anoxia tank; discharging the clear water in the upper of the desilter from the exhaust pipe; refluxing the treated water in the reactor into the anoxia tank through internal reflux pipe. This invention avoids the stratification, which can decrease the operating expense.

The invention discloses a method for extracting total flavonoids in grape seeds in a double-aqueous phase system, belonging to the field of separation and extraction methods of natural product active ingredients. The method comprises the following steps of: firstly preparing grape seed rough extract from grape seeds with ethanol; then adding absolute ethyl alcohol, ammonia sulfate, inorganic salt and water in the grape seed rough extract to form the double-aqueous phase system, mixing uniformly, standing for 5-30 minutes at room temperature for delamination to obtain an upper phase and a lower phase, concentrating the upper phase through pressure reduction and drying so as to obtain total flavonoids of grape seed. In the double-aqueous phase system, the mass percents of grape seed rough extract, absolute ethyl alcohol, ammonia sulfate and inorganic salt are respectively 5% to 30%, 10% to 30%, 16% to 30%, and 0 to 5%, the balance is supplemented to be 100% with water, and the pH of the double-aqueous phase system is 3.0 to 11.0. Flavonoids are extracted by utilizing double aqueous phases in the method; the method is simple, the operation is convenient, the production cost is low and the treating capacity is large, small test data can be directly amplified, and the yield of flavonoids in the grape seeds reaches up to 98.2%; and the method can be operated continuously, and is suitable for industrialized production of flavonoids in the grape seeds.

The invention provides a method for performing extraction separation on cobalt and nickel by using a microfluid technology. The method comprises the following steps of: uniformly mixing an extraction agent and diluent which are subjected to homogeneous phase saponification by using a mixed material liquid of Co<2+> and Ni<2+>, using 2-ethyl cthylhexyl phosphonate mono 2-ethyl cthylhexyl ester as the extraction agent and using No.260 solvent oil and using the extraction agent and the diluent as an oil phase; introducing the water phase and the oil phase into a micro-reactor by virtue of two flow pumps; mixing the two phases in the micro-reactor and performing extraction reaction at 25-50 DEG C; and collecting a product at an outlet of the micro-reactor and standing for separating the phases to ensure that Co<2+> enters the oil phase and Ni<2+> stays in the water phase so as to realize extraction separation of cobalt and nickel. According to the method, continuous flow micro-reactor with an enhanced hybrid channel structure is adopted, the extraction separation of cobalt and nickel is carried out, and the reaction time is shortened to be within a micro-second level range, so that single-level cobalt extraction efficiency is obviously improved, and the extraction levels are reduced; and moreover, standing layering on the water phase and the oil phase can be quickly carried out without any emulsion phenomenon.

The invention discloses a microwave-assisted Soxhlet and solid-phase extraction coupling device, a microwave-assisted Soxhlet and solid-phase extraction coupling method and application of microwave-assisted Soxhlet and solid-phase extraction coupling. The microwave-assisted Soxhlet and solid-phase extraction coupling device comprises a microwave-assisted extractor, a Soxhlet extractor, solid-phase adsorbents, an extraction bottle, a reflux condensing pipe and the like, and extraction and purification are synchronously completed by means of coupling microwave-assisted Soxhlet extraction and solid-phase extraction. When in extraction, the solid-phase adsorbents are filled into a Soxhlet extraction device, the extraction bottle is directly placed in the microwave-assisted extractor for extraction after extraction solvents are added into the extraction bottle, analytes are collected into the extraction solvents, and interfering components in samples are adsorbed by the solid-phase adsorbents. High efficiency of microwave-assisted extraction, universality of Soxhlet extraction and high selectivity of solid-phase extraction are combined, the device is simple and convenient in operation, is conveniently used with an analysis instrument, and is suitable for extraction and purification of trace organics in complicated samples.

The invention relates to a method for synthesizing cyclic carbonate ester in a micro reactor system, which comprises the following steps of: firstly mixing a liquid material containing an epoxy compound and a catalyst with a gas material containing carbon dioxide in a micro mixer, and then synthesizing cyclic carbonate ester in a micro channel reactor through a cyclization reaction. For the method, the reaction temperature is 100-220 DEG C, the pressure is 1.0-7.0 MPa, the molar ratio of carbon dioxide to epoxy compound in the gas-liquid two-phase material is 1.0-5:1, the mass ratio of the epoxy compound to the catalyst is 1.0-1000:1, and the retention time of the gas-liquid two-phase material in the micro channel reactor is 1.0-300 s. The reaction system has quick mass transfer and heat transfer rates, continuous process, easiness in control, high process safety and high energy utilization ratio, and the space-time yield and the selectivity of the target product can be greatly increased.

The invention discloses a polymer brush graft boracic acid affinity separation material and a preparation method and application, which use a reversible-addition fragmentation chain transfer (RAFT) polymerization method, use amide compounds with phenylboronic acid groups as monomers, wherein the amide compounds are polymerized on the surfaces of polyacrylic acids, silica gels, agarose and magnetic nanoparticles to obtain the polymer brush graft boracic acid affinity separation material. The polymer brush graft boracic acid affinity separation material has the advantages of high adsorption capacity, excellent selectivity and rapid mass transfer rate, can be used for preparation, separation and content analysis of biomolecules containing cis vicinal diols, and can greatly improve separation enrichment efficiency.

A process for effectively preparing the theapolyphenol includes mixing fresh tea leaves with solvent, homogenizing, solid-liquid extracting, filtering, mixing dregs with solvent, solid-liquid extracting, collecting the liquid extract, concentrating, mixing with dichloromethane solution, liquid-liquid extracting, centrifugal treating, mixing the liquid extract with ethyl acetate, liquid-liquid extracting, centrifugal treating, filtering, concentrating, drying and purifying. Its advantages are short period and high output rate.

The invention relates to a protein surface molecular imprinting material based on an RAFT (Reversible Addition-Fragmentation Chain Transfer) strategy. The protein surface molecular imprinting material is subjected to polymerization reaction by taking a silica gel granule with a dithioester functional group modified as a matrix, a lysozyme as a template protein, MAA (Methyl Acrylic Acid) and HEMA (Hydroxyethyl Methacrylate) as monomers, MBA (Methylene Diacrylamide) as a cross-linking agent and a phosphate water solution as a solvent and adopting a redox initiate polymerization reaction mode; after the polymerization reaction is completed, the template protein formed in a polymer is eluted, and then the dithioester functional group on a material surface is reduced into sulfhydryl, so that a hydrophilic lysozyme molecular imprinting core-shell structure microsphere can be obtained; and the hydrophilic lysozyme molecular imprinting core-shell structure microsphere is applied to the specific identification of the lysozyme. The protein surface molecular imprinting material disclosed by the invention can be used for realizing the controllability of the polymerization reaction and polymer chain growth by virtue of the reversible addition-fragmentation chain transfer strategy, and realizing narrow polymer distribution, controllable chain length and uniform polymer layer distribution so as to form sufficient surface imprinting sites.

The invention relates to a vibrating screen plate tower for continuous production of liquid-liquid-liquid three-phase extraction. A cylindrical tower body comprises a light-phase clarification outer tank connected to the upper part of the cylindrical tower body and a tower bottom clarification tank connected to the lower part; a spindle leads to the lower part of the cylindrical tower body from the exterior of the light-phase clarification outer tank; the upper part and the lower part of the cylindrical tower body are provided with a conical liquid baffle and a light-phase distributor which are arranged on the spindle respectively; a middle screen plate is arranged in the middle of the spindle; a heavy-phase guide cylinder is arranged inside the light-phase clarification outer tank; a heavy-phase mixing chamber is arranged inside the heavy-phase guide cylinder; a bottom liquid outlet of the heavy-phase guide cylinder is positioned at the conical liquid baffle; a polymer phase distributor and an aqueous phase distributor are arranged on a polymer phase conduit and an aqueous phase conduit in the heavy-phase mixing chamber; a tower top screen plate is fixedly arranged on the spindle in the heavy-phase mixing chamber; a sealing ring is arranged between the spindle and the heavy-phase mixing chamber; and two layers of deflection baffles which are arranged in a staggered mode are fixedly arranged on the spindle in the tower bottom clarification tank. The vibrating screen plate tower has high mass transfer efficiency and high controllability.

The invention belongs to the field of material science and engineering and bioseparation engineering, and concretely relates to a preparation method for a fluorescent western-blotting magnetic composite microballoon. A miniemulsion polymerization method is employed to take phycocyanin as a molecular imprinting template and combine with a magnetically-sensitive fluorescent material, so that the phycocyanin molecular-imprinted-polymer magnetic fluorescent composite microballoon is obtained. By using the miniemulsion polymerization method, the molecular-imprinted-polymer microballoon integrates the magnetic and fluorescence double-responsive material, has specific recognition and autonomous adsorption on phycocyanin, is good in selectivity, high in adsorption efficiency, fast in speed, convenient and rapid for separation under the effect of an external magnetic field, and good in repeated usage performance, and is capable of realizing fluorescence real-time detection and fluorescence imaging at a relatively wide pH scope. Also the obtained magnetic core-shell blotting microballoon is regular in morphology and uniform in particle size. The preparation method has the advantages of low cost, simple and convenient operation, good reappearance and the like, and has wide application prospect.

The invention discloses an on-line coupling system for a dynamic liquid-liquid solid imprinted microextraction-liquid phase chromatogram, which comprises a magnetic agitator, a water bath bottle, an extracting bottle, a draft tube, a peristaltic pump, a high-pressure six-way switching valve, a molecularly imprinted solid phase extracting material, a high-pressure six-way sample valve, a quantifying cup, a sample needle, a liquid phase chromatographic pump, a chromatographic column, a detector, a liquid phase chromatogram and the like. Through the coupling of a dynamic liquid-liquid solid imprinted microextracting device and the liquid phase chromatogram, the on-line overall processes of the preenrichment, the extraction, the desorption, the separation and the detection of a target analytein a water phase sample are achieved. By using the system, the universality of liquid-liquid extraction, the high selectivity and the high enrichment capability of a molecularly imprinted solid phasemicroextraction technique, the efficient separation capability and the high sensitivity of the liquid phase chromatogram are combined; the analysis degree of automation is improved; the analysis timeis shortened; the accuracy and the precision are improved; and the system can be effectively applied to the analysis and the detection of a trace organic matter in a complicated sample.

The invention discloses a polydopamine coated magnetic Fe3O4 molecularly imprinted polymer, a preparation method thereof and application of the polydopamine coated magnetic Fe3O4 molecularly imprintedpolymer. The invention also discloses an electrochemical sensor based on the polydopamine-coated magnetic Fe3O4 molecularly imprinted polymer, a preparation method of the electrochemical sensor and application of the electrochemical sensor. According to the polydopamine coated magnetic Fe3O4 molecularly imprinted polymer, the preparation method thereof, the application of the polydopamine coatedmagnetic Fe3O4 molecularly imprinted polymer, the electrochemical sensor based on the polydopamine-coated magnetic Fe3O4 molecularly imprinted polymer, the preparation method of the electrochemical sensor and the application of the electrochemical sensor of the invention, Fe3O4 is used as a carrier, molecular imprinting is directly carried out on the surface of the Fe3O4, and therefore, a complexsurface modification process is simplified. DDT recognition, extraction and separation performed a target compound have the advantages of specificity, simple steps, high efficiency and the like; a surface molecular imprinting technology is combined with electrochemical impedance spectroscopy (EIS), so that the constructed electrochemical impedance sensor integrates the advantage of selectivity ofthe molecular imprinting and the advantage of high sensitivity of the EIS.

The invention discloses a graphene oxide doped molecular imprinted polymer stirring rod as well as a preparation method and application thereof. The graphene oxide doped molecular imprinted polymer stirring rod comprises a glass capillary tube, an iron core and an extraction coating; the iron core is arranged in the glass capillary tube with two hotly-sealed ends; and the extraction coating is a graphene oxide doped propranolol molecular imprinted polymer coating which is chemically bonded on the surface of the glass capillary tube. According to the graphene oxide doped molecular imprinted polymer stirring rod, a glass stirring rod which is activated by a sodium hydroxide solution is immersed into a mold containing a graphene oxide doped molecular imprinted prepolymerization solution; and after reaction is finished, the graphene oxide doped molecular imprinted polymer coating stirring rod is taken out. The graphene oxide doped molecular imprinted polymer stirring rod disclosed by the invention can be used for selectively extracting and analyzing medicines, and has the advantages of strong water-phase identification capability, good extraction selectivity, high adsorption capacity, rapid mass transfer rate, good mechanical stability, good heat stability, good chemical stability and the like.

The invention discloses a polymer-supported dual-core acid ion liquid catalyst and preparation and application thereof. According to the polymer-supported dual-core acid ion liquid catalyst, vinylbenzyl chloride and vinyl benzene serve as polymeric monomers, divinyl benzene serve as cross-linking agent, polymers obtained through free radical polymerization serve as carriers, bis(2-chloroethyl) amine, benzimidazole, 1, 3-propane sultone and concentrated sulfuric acid or trifluoromethanesulfonic acid serve as the raw materials, and through a bonding method, effective immobilization of ionic liquid onto polymeric microspheres can be achieved. The polymer-supported dual-core acid ion liquid catalyst blends the advantages of the ionic liquid and polymers and has the advantages of being large in specific surface area, adjustable in pore structure, high in hydrophobicity, simple in preparation method, high in catalytic activity and mass transfer rate, good in selectivity, high in stability, easy to recover and separate, environmentally friendly, broad in industrialized application prospect and the like. When applied to esterification reaction of various acids and alcohols, the polymer-supported dual-core acid ion liquid catalyst can achieve good effects.

The invention provides a method for extraction-oxidation ultra-deep desulfurization of diesel in a microreactor system. The method is characterized by improving an existing extraction-oxidation ultra-deep desulfurization technology based on ionic liquid by utilizing the microreactor system. The method comprises the following steps: enabling the diesel and an extracting agent-ionic liquid to be subjected to contact and mixing in a first micromixer; extracting most of sulfide from the diesel to the ionic liquid in a micromixing channel; then enabling a diesel-ionic liquid two-phase mixed material and an oxidant to be subjected to contact and mixing in a second micromixer, and completing oxidation and removing of the sulfide in a microchannel reactor connected with an outlet of the second micromixer, thus realizing ultra-deep desulfurization of the diesel, wherein the retention time of reaction materials in the microchannel reactor is 10 to 90 minutes. Compared with the prior art, the method has the advantage that efficient desulfurization and equipment miniaturization are realized through intensification on a desulfurization process; the technology is simple, continuous production can be realized, and a wide practical industrial application prospect is obtained.

The invention provides an environmentally-friendly transport vehicle for fresh and live aquatic products. The environmentally-friendly transport vehicle comprises a carriage, a solar cooling system isarranged on the carriage, the carriage is internally provided with keep-alive boxes with a water cycle device, and a solar power system used for power supply is provided; the water cycle device comprises a water pump, a water inlet of the water pump is communicated with the keep-alive boxes, a water outlet of the water pump is connected with a filtering and sterilization box, the filtering and sterilization box is connected with a cool-heat-exchanger through a foam separation device, the cool-heat-exchanger is communicated with the keep-alive boxes, and the water pump is connected with a controller. According to an inner-box environment monitoring system of the transport vehicle, optical fiber sensors are applied to measurement of oxygen, the temperatures and ammonia-nitrogen in water inan aquatic product transporting process, so that the transport environments of the aquatic products are accurately monitored in real time; according to the transport vehicle, the multiple keep-alive boxes are independently controlled, and the appropriate environments are provided for each kind of aquatic products, so that the transporting keep-alive rate of the fresh and live aquatic products is effectively improved.

Disclosed is a method for preparing an organic arsines molecular imprinting monolithic column and application thereof. The method comprises the steps of taking organic arsines veterinary drug carbarsone / nitarsone as template molecules, dissolving the template molecules in a mixed solution of carbinol and dodecanol, adding functional monomers, adding a cross-linking agent and a initiating agent after the mixture is prepolymerized at a low temperature, injecting the mixture into a lower-end-sealed empty column tube of a solid phase extraction column after nitrogen is led, sealing the upper end of the empty column tube of a solid phase extraction column, triggering polymerization at a temperature ranging between 10 DEG C and 30 DEG C for 12 hours to 60 hours, and then obtaining the molecular imprinting monolithic column. The molecular imprinting monolithic column which has good adsorption and enrichment effects on the organic arsines veterinary drug is obtained after the column is eluted from a porogen and the template molecules by a mixed solution of the carbinol and acetic acid. Compared with a traditional mass polymerization method, the method has advantages that the preparation and the postprocessing are simple, recognition is good, cost is low, and the required apparatus and reaction conditions can be acquired easily. The molecular imprinting monolithic column provided by the method can separate, enrich and purify the organic arsines veterinary drug remained in animal origin foods.

The invention discloses nucleic acid aptamer-molecular imprinting synergistic recognition magnetic microspheres and a preparation method and application thereof. The nucleic acid aptamer-molecular imprinting synergistic recognition magnetic microspheres disclosed by the invention comprise magnetic microsphere inner cores and nucleic acid aptamer-molecular imprinting synergistic recognition shells;the nucleic acid aptamer-molecular imprinting synergistic recognition shells have molecular imprinting polymer rigid recognition cavities; the molecular imprinting polymer rigid recognition cavitieshave structural stability, difficult deformation and strong specific adsorptivity; and nucleic acid aptamers are not easy to digest.

The invention discloses a novel continuous automated reaction process for preparing an aminopolycarboxylic acids chelating agent and belongs to the technical field of aminopolycarboxylic acids chelating agents. Production is conducted through a flow reactor, a whole reaction system is under DCS automation control, and the process comprises the following steps: 1, material blending and mixing, wherein raw materials are continuously and stably pumped into a batcher for mixing, so that a liquid mixture is obtained; 2, preheating treatment, wherein the liquid mixture is pumped out of the batcher through a material delivering pump, and the liquid mixture which is pump out is subjected to heating treatment through a heater; 3, reaction and generation, wherein heated liquid materials and formaldehyde or heated liquid materials and a glycolonitrile solution are added into the reactor for a reaction, ammonia gas generated through the reaction is discharged through the top of the reactor and collected, and a reaction solution is drained through the bottom of the reactor and delivered to the acidification procedure for after-treatment through the material delivering pump, so that the aminopolycarboxylic acids chelating agent is obtained. By means of the process, the aminopolycarboxylic acids chelating agent can be produced in a continuous and automated mode, and stability of the reaction process is improved.

The invention discloses a method for efficiently preparing nano barium sulfate with uniform particles. Soluble BaS raw ore is used as a raw material to prepare the nano barium sulfate by virtue of pretreatment, main reaction and after-treatment. The method specifically comprises the following steps: adding the raw material soluble BaS raw ore into deionized water, dissolving to obtain a 0.1 to 5 mol / L BaS solution, wherein the BaS solution is used as a reaction solution a for standby use; preparing a sulfuric acid solution with the same concentration as the reaction solution a, wherein the sulfuric acid solution is a reaction solution b which is used for the standby use; pumping the reaction solution a and the reaction solution b into a micro reactor to react at a speed of 50 to 150 ml / min, standing for 0.1 to 20 s in the micro reactor, collecting a product c at an outlet of the micro reactor, and recovering H2S gas generated in the main reaction; and centrifuging, washing and drying the product c to obtain a target object nano barium sulfate with uniform particles. The nano barium sulfate product prepared by the method has the characteristics of uniformity in size distribution, good dispersity, narrow distribution of particle size and the like, and the particle size of the product is in a range of 30 to 50 nm.

The invention relates to a device and a method for recovering and concentrating ortho-toluidine in ortho-toluidine wastewater by membrane extraction. The method comprises: conveying wastewater containing ortho-toluidine to a silicon rubber extraction membrane tube, wherein the silicon rubber extraction membrane tube is put in an acidic extraction solution, ortho-toluidine in the wastewater can penetrate through the tube wall of the silicon rubber extraction membrane tube, enter into the extraction solution and react to generate ortho-toluidine ions, and the rest of the wastewater is discharged from the outlet of the silicon rubber extraction membrane tube with standard level or post-treatment; and taking out the extraction solution when the concentration of the ortho-toluidine ions in the extraction solution exceeds a predetermined value, and adding alkali liquor into the extraction solution to obtain recovered and concentrated ortho-toluidine. According to the device and method provided by the invention, the extraction solution is acidic and is reacted with alkalescent ortho-toluidine to generate the ortho-toluidine ions which cannot penetrate through the silicon rubber extraction membrane tube so as to prevent the ortho-toluidine from returning to the wastewater again. A lot of ortho-toluidine can be separated and concentrated, the mass transfer velocity is relatively rapid, industrial treatment and concentration and recovery of the ortho-toluidine are facilitated, and the use level of the extraction solution is extremely little.

An anti-micellar method for degradating cellulose includes dissolving cellulase in buffering liquid, preparing the organic solution of surfactant, mixing them together, adding microcrystalline cellulse, phosphoric acid buffering liquid and extractant, strong waving, centrifugal layering, and taking the upper soluiton, laying to obtain glucose solution.

The invention relates to a rapid crystallization method for synthesizing EMT molecular sieve. In a synthetic system, an EMT molecular sieve seed crystal synthesized under the condition of no templateagent is added and made into a gel. After the gel is aged, the gel is hydrothermally crystallized for 12 to 72 hours, and then crystallized under microwave conditions for 4 to 360 minutes to synthesize the EMT molecular sieve. Compared with the prior art, the method for synthesizing the EMT molecular sieve has a small use amount of the template agent, short molecular crystallization time, high degree of crystallinity, and low energy consumption.

The invention discloses a preparation method and application of aptamer-modified chitosan nano fibers. The preparation method comprises the following steps: (1) preparing a chitosan solution; (2) preparing chitosan nano fibers; (3) chemical immobilization: taking the aptamer solution, adding an EDC / NHS (1-ethyl-3-(3-dimethylaminopropyl)carbodiimide / N-hydroxysuccinimide) solution for activation, adding the chitosan nano fibers obtained in the step (2), and oscillating to react at normal temperature; and (4) after-treatment: carrying out solid-liquid separation on the reaction mixed solution obtained in the step (3) to obtain the aptamer-modified chitosan nano fibers. The aptamer-modified chitosan nano fibers are suitable for high-selectivity separation and enrichment of trace or ultra-trace mycotoxin substances and other substances in the food and environment, and have the advantages of high selectivity, high extraction capacity, high stability and simple preparation process.

The invention discloses an iron oxyhydroxide nanorod / foam carbon composite material and a preparation method and application thereof. According to the iron oxyhydroxide nanorod / foam carbon composite material, foam carbon is used as a substrate, and iron oxyhydroxide nanorods are uniformly loaded on the substrate. The iron oxyhydroxide nanorod / foam carbon composite material is prepared by uniformly loading iron oxyhydroxide nanorods on the foam carbon substrate through a hydrothermal synthesis method. The iron oxyhydroxide nanorod / foam carbon composite material can be directly used as an adsorbent for removing arsenic from a water body. The iron oxyhydroxide nanorod / foam carbon composite material has strong adsorption capacity and less secondary pollution, is easy to separate and recover, has fast mass transfer rate, is low-cost, and can achieve rapid, efficient and selective removal of arsenic in a water body.

The invention provides a method for continuously catalyzing and degrading lignin bio-oil into aromatic hydrocarbons and naphthenic hydrocarbons with a micro-channel reaction device. The method comprises the following steps that firstly, in an alcohols solvent, a base catalyst is used for catalyzing lignin to be hydrogenated and depolymerized into phenolic bio-oil; secondly, the base catalyst in the phenolic bio-oil is filtered out, the phenolic bio-oil and hydrogen are pumped into the micro-structure reaction device respectively at the same time and mixed evenly and then react in the micro-channel reaction device, and the phenolic bio-oil is hydrocracked into aromatic hydrocarbons or naphthenic hydrocarbons, wherein the micro-channel reaction device is filled with a dual-functional catalyst; thirdly, aromatic hydrocarbons or naphthenic hydrocarbons are extracted from reaction liquor.

The invention relates to a modified electrode for a norfloxacin molecular imprinting electrochemical sensor and a preparation method of the modified electrode. Norfloxacin is adopted as template molecules, methacrylic acid is adopted as functional monomers, ethylene glycol dimethacrylate is adopted as a cross-linking agent, a molecular imprinting polymer MWCNTs-MIP nano-modified material is grafted on the surface of a three-dimensional network multi-walled carbon nanotube prepared by means of a thermal polymerization method, and the nanotube is modified onto the surface of a substrate electrode. The electrode prepared by grafting the molecular imprinting polymer MWCNTs-MIP nano-modified material on the surface of the three-dimensional network multi-walled carbon nanotube has the advantagesof high porosity, large specific surface area, high electrical conductivity and good biocompatibility. The modified electrode is used in the electrochemical sensor and has a good detection response to norfloxacin molecules, the linear range of the modified electrode is 0.003-0.391 mirco-mol / L and 0.391-3.125 mirco-mol / L, and the detection lower limit is 1.58 nmol / L. The modified electrode can beapplied to the content detection of norfloxacin in capsule preparations and plasma samples.