186 results about "Methylene blue" patented technology

The invention discloses a polyacid-based metal viologen framework crystalline material as well as a preparation method and application thereof, and belongs to the technical field of heterogeneous catalytic materials. The crystalline material is synthesized in one step through a hydrothermal method, the molecular formula is Cu2 (H2O) 2 (L) 2 [PW12O40] [OH]. 2H2O, the crystalline material belongs to a monoclinic system, the space group is P21, the cell parameters are alpha = 90 degrees, beta = 114.208 (2) degrees and gamma = 90 degrees, and the structure of the crystalline material is determined through X-ray diffraction. According to the material, accurate compounding of polyacid clusters and metal viologen on the molecular level is achieved, an effective electron transmission channel is constructed, separation of photon-generated carriers is remarkably promoted, and excellent photocatalytic activity is shown. At the ambient temperature, the crystalline material can be used as a catalyst to efficiently degrade dye pollutants (such as methylene blue and rhodamine B) in a water body, the degradation rate within 60 minutes exceeds 90%, and the crystalline material has good cycle stability and structural durability.

The invention discloses an indium-based metal-organic framework material based on a pyridine hexacarboxylic acid ligand as well as a preparation method and application of the indium-based metal-organic framework material, the chemical formula is {[NH2Me2] 2 [In4 (mu2-O) (H6L) 2 (H2O) 2]. 3DMF. 10H2O} n, and H6L is an organic ligand 4, 4 ', 4' '-(pyridine-2, 4, 6-triyl) triisophthalic acid. The material has excellent thermal stability and chemical stability, and due to the frame charge characteristic and the excellent pore structure of the material, the metal organic frame material shows efficient dye selective adsorption and separation performance, can selectively adsorb cationic dye methylene blue MB and repel anionic dye methyl orange MO at the same time. In conclusion, a new design thought is developed for the novel indium-based metal organic framework material based on the pyridine hexacarboxylic acid ligand, and meanwhile, a new candidate is provided for developing a high-efficiency dye wastewater purification material.

This invention discloses an amplification-free electrochemical biosensor and method based on CRISPR-Cas13a. The sensor includes an electrochemical biosensor substrate, a dual-channel RNA reporter molecule, a CRISPR-Cas13a reaction system, and a dual-channel differential signal processing module. The working electrode surface is immobilized with a stem-loop structured first reporter molecule and a linear second reporter molecule loaded with gold nanoparticles, labeled with methylene blue and ferrocene signal molecules respectively, and immobilized with a ferrocene-specific capture probe. When target RNA is present, Cas13a is activated and non-specifically cleaves the reporter molecule, reducing the methylene blue signal and enriching and enhancing the ferrocene signal. Background self-calibration is achieved through dual-channel differential ratio calculation. This invention integrates signal attenuation and signal enhancement modes, offering advantages such as nucleic acid amplification-free operation, fast detection speed, high sensitivity, and strong anti-interference capability.

The invention relates to the technical field of dye separation, and discloses a loose nanofiltration membrane and a preparation method and application thereof, the loose nanofiltration membrane comprises a porous support membrane, and a polyesteramide separation layer formed on the porous support membrane through one-step interfacial polymerization of nucleoside monomers and multi-acyl chloride monomers. The nucleoside monomer is one or more than two of adenosine, guanosine and cytidine nucleoside. The nucleoside monomer with a long-chain structure, a branched-chain structure, a rigid twisted structure and a plurality of hydrophilic reaction sites is selected as an interfacial polymerization water-phase monomer, so that the loose nanofiltration membrane is endowed with excellent permeation and separation performance. The membrane has a high rejection rate on dye molecules such as Congo red and methyl blue, also has high water permeability and extremely high dye / inorganic salt separation selectivity, and shows good application potential in the aspects of dye production and purification and dye wastewater recovery.

The invention discloses a black phosphorus-methylene blue nano composition for improving blood brain permeability and a synthesis method thereof. The synthesis method comprises the following steps: step 1, mixing black phosphorus nanosheets with polyethylene glycol for reaction; step 2, carrying out centrifugal cleaning on the reaction liquid in the step 1, and collecting a lower-layer reactant; step 3, adding aminated superparamagnetic nanoparticles and methylene blue into the lower reactant obtained in the step 2 for reaction; and 4, carrying out centrifugal cleaning on the reaction liquid obtained in the step 3, and collecting a lower-layer reactant. The invention also discloses the black phosphorus-methylene blue nano composition synthesized by the synthesis method, the drug loading rate of methylene blue in the composition exceeds 60%, and the composition has good biological safety, is non-toxic to cells and mice, is very simple and convenient in preparation process, and has a wide application prospect in the aspect of improving the blood-brain barrier permeability.

The invention relates to an application of a nanosphere fluorescent probe combined CRISPR (clustered regularly interspaced short palindromic repeats) in detection of exosomes, which comprises the following steps: inserting DNA nanospheres as a carrier of fluorescent signal molecule methylene blue into a cholesterol probe on an exosome membrane to start a strand displacement reaction, activating trans-cleavage activity of Cas12a by a reaction product to split the DNA nanospheres wrapped with methylene blue, further, qualitative and quantitative analysis of the exosome is realized through fluorescence signal detection of methylene blue. Compared with a common CRISPR / Cas-based biosensing platform, the nanosphere fluorescent probe and the CRISPR are combined, so that high-sensitivity detection of the exosome can be realized, and the application scene of the nucleic acid nanoprobe and the CRISPR-Cas system in fluorescent biosensing is widened.

The invention discloses a printing and dyeing wastewater nanofiltration membrane anti-pollution-separation performance evaluation method, and belongs to the field of membrane separation technology performance detection.The evaluation method comprises the steps that a to-be-detected nanofiltration membrane is designed for staged pollution experiments, actual printing and dyeing wastewater is filtered, and the nanofiltration membrane for continuously filtering the printing and dyeing wastewater is subjected to staged cleaning regeneration; and testing data such as flux, methylene blue rejection rate and NaCl rejection rate in the experiment process, calculating a flux comprehensive attenuation rate, a graded recovery rate, a separation performance stability coefficient, a charge stability coefficient and a hydrophilic promotion rate, and evaluating the anti-pollution-separation performance grade of the to-be-tested nanofiltration membrane according to calculation results. The technical defects that parameters of a traditional evaluation system are disjointed and dimensions are one-sided are overcome, and the evaluation method can directly guide modification optimization and engineering type selection of the nanofiltration membrane for printing and dyeing wastewater treatment.

The application discloses an electrochemical sensor for detecting IBD protein markers and a preparation method thereof. The electrochemical sensor is composed of a CNT-embedded semi-cured PDMS flexible substrate, deposited gold nanoparticles and a nucleic acid sensing layer. The nucleic acid sensing layer comprises a tumor necrosis factor-alpha sensor, an interleukin 6 sensor, an interleukin 8 sensor, a transforming growth factor beta 1 sensor, a reference electrode and a counter electrode. The tumor necrosis factor-alpha sensor, the interleukin 6 sensor, the interleukin 8 sensor and the transforming growth factor beta 1 sensor all adopt single-stranded aptamers modified by a signal molecule methylene blue, and the nucleotide sequences corresponding to the single-stranded aptamers are SEQ ID NO. 1-4. The application can improve the modulus matching of the sensor and human tissue and excellent biocompatibility, realize accurate detection of low-concentration biomarkers and stable signal output of the sensor under a strain working condition.

According to the method, melamine and urea are used as carbon and nitrogen sources, hollow tubular phosphorus-doped carbon nitride is constructed by adopting a sodium polyphosphate-assisted hydrothermal-thermal polymerization method, molybdenum disulfide is loaded on the surface of P-TCN in a hydrothermal in-situ growth mode, and the hollow tubular phosphorus-doped heterojunction photocatalyst is obtained. The hollow tubular phosphorus-doped heterojunction photocatalyst P-TCN / MoS2 is prepared; the catalyst disclosed by the invention shows excellent degradation performance on ciprofloxacin, levofloxacin, rhodamine B and methylene blue under an illumination condition. The catalyst disclosed by the invention is simple in preparation method, low in cost and easily available in raw materials, and has a wide application prospect in the field of photocatalytic treatment of antibiotic and dye wastewater.

The invention discloses a preparation method of an intestinal canal filling temperature-sensitive gel injection for gastrointestinal anastomosis guided by an ultrasonic endoscope, and belongs to the technical field of regenerative medicine. According to the specific method, poloxamer, chitosan, polycarbophil, polyvinylpyrrolidone, iohexol and methylene blue are utilized to construct the novel intestinal canal filling temperature-sensitive gel injection. The injection can be injected into the anastomotic intestinal segment of the small intestine by using a conventional nasobiliary drainage tube which is clinically used at present, and the injection becomes viscous immediately under the action of the pH value of the small intestine after injection, so that the injection is inhibited from spreading all around. Meanwhile, the injection is quickly converted into high-strength hydrogel under the action of body temperature, and the hydrogel is adhered to small intestine mucosa to inhibit gel sliding. Therefore, the injection can form a section of gel on a target small intestine section, local immobilization filling and supporting of the target small intestine section are achieved, development can be achieved, the operation difficulty of intestinal tube puncture and stent placement in gastrointestinal anastomosis guided by an ultrasonic endoscope can be greatly reduced, the operation efficiency and the success rate are improved, and the operation cost is reduced. The dosage is less than that of normal saline which is conventionally used clinically, and the effect is better. Moreover, the gel temperature can be reduced by injecting low-temperature normal saline after the operation, so that the gel is thoroughly dissolved into a solution and discharged out of the body, and the phenomenon that the gel remains in the intestinal canal after the operation to cause obstruction is avoided. Therefore, the novel intestinal canal filling temperature-sensitive gel injection has very important clinical practical application value for gastrointestinal anastomosis guided by an ultrasonic endoscope.

The application relates to the technical field of adsorbents, in particular to modified sodium alginate as well as a preparation method and application thereof; the preparation raw materials of the modified sodium alginate include sodium alginate, an activating agent, a mercapto reagent, a carboxylic acid compound containing an unsaturated double bond and an initiator. The application adopts natural polysaccharide sodium alginate as raw materials, which is widely sourced, non-toxic and biodegradable; a functional group carboxyl is introduced into the sodium alginate through a mercapto-alkene click reaction; the surface adsorption active sites of the modified sodium alginate are increased; the modified sodium alginate can effectively adsorb and remove methylene blue and ciprofloxacin in water; and the modified sodium alginate can still maintain good adsorption performance after being subjected to multiple cycles of adsorption-desorption.

The invention discloses an application of methylene blue in preparation of drugs for preventing and treating aortic dissection and aortic aneurysm, which proves that after methylene blue is orally taken in an aortic aneurysm mouse model, expansion of aortic diameter can be inhibited and occurrence rate of aortic dissection and aortic aneurysm can be reduced after methylene blue is given. Abnormal aorta dilatation of mice and disorder and fracture of elastic fibers caused by BAPN water drinking are improved. Therefore, the death rate of the BAPN-induced aortic dissection and aortic aneurysm mice can be reduced and the disease progress of the aortic dissection and aortic aneurysm can be delayed by giving the methylene blue, so that the expansion condition of the aorta of the mice is improved and the survival rate is increased.

This method provides in situ quantification of the overall mitochondrial redox state, the redox state of individual cytochromes such as complex III and IV, and methods for treatment should the redox state be identified as hyperoxidized. Mitochondrial rescue from IRI-mediated injury can be achieved using methylene blue, which acts as an alternate electron donor to bypass complex III.

The present disclosure relates to waterborne compositions which comprise methylene blue as a preservative to prevent and / or significantly reduce the buildup of microbials, and mold growth during storage after manufacture and prior to use. This is particularly designed for waterborne coating compositions, especially waterborne film forming coating compositions for which standard biocides are unsuited because of their end use and customer requirements and for which if left unpreserved the development of such microbials, and mold growth can lead to several negative effects including viscosity change, color change, odor and even performance failure.

This invention relates to a method for preparing sodium trimolybdate ammonium monohydrate, characterized in that: (1) ammonium molybdate is dissolved in pure water, and the mass-to-volume ratio of ammonium molybdate to water is controlled at (1-15):50, and stirred evenly; then saturated sodium chloride solution is added to the solution, and the volume ratio of saturated sodium chloride solution to water is controlled at 1:2-5:1; after stirring evenly, 5~95 o C. Let stand for 4-12 days to obtain white flocculent matter; (2) Gently remove the white flocculent matter with a key or glass rod, and wash it by suction filtration or centrifugation. Since sodium trimolybdate monohydrate is water-soluble, it should be washed in small amounts and multiple times; (3) Dry and grind the washed white flocculent matter to obtain sodium trimolybdate monohydrate. Advantages of the present invention: The content of sodium trimolybdate monohydrate obtained is 92-98%, and the yield is 95-99%. The adsorption rate of sodium trimolybdate monohydrate on wastewater containing basic fuchsin and methylene blue is as high as 80% or more.

This invention belongs to the field of SERS detection technology, specifically relating to an Ag-Cu 0.5 Zn 0.5 Application of Fe2O4 composite SERS substrate in the detection of methylene blue in wastewater. First, Cu was prepared using a calcination method. 0.5 Zn 0.5 Fe2O4 nanomaterials, and then Ag NPs are grown on Cu 0.5 Zn 0.5 Ag-Cu was prepared on Fe2O4 support surface. 0.5 Zn 0.5 Fe2O4 composite SERS substrate was loaded onto a glass slide. This substrate integrates the LSPR effect of Ag NPs and Cu. 0.5 Zn 0.5 The cation rearrangement and lattice distortion effects introduced by Fe2O4 optimize the separation and migration behavior of photogenerated charges. The abundant defect states and tunable electronic structure brought about by Cu / Zn synergistic regulation are conducive to constructing efficient interfacial charge transfer channels, thereby enhancing the Raman signal and enabling the detection of trace amounts of methylene blue in wastewater.

The invention provides an antheraea pernyi fresh-keeping method which comprises the following steps: S1, dividing a first group and a second group with different freezing response characteristics according to development biological characteristics of antheraea pernyi; the freezing response characteristic is represented by at least one parameter of tissue moisture content, methylene blue penetration depth and body wall elasticity modulus; s2, differential preprocessing is applied to the first group and the second group, so that the difference of the first group and the second group on any characterization parameter does not exceed a preset threshold value; s3, combining the two groups of tussah and freezing; in the first cooling stage, cooling from 0-1 DEG C to-10 DEG C at the speed of 0.8-1.2 DEG C / min; in the second cooling stage, cooling is conducted from-10 DEG C to-30 DEG C at the speed of 0.45-0.55 DEG C / min; in the third cooling stage, cooling from-30 DEG C to-45 DEG C at the speed of 1.8-2 DEG C / min; and S4, after freezing is completed, vacuum packaging is performed, and storage is performed at minus 45-minus 40 DEG C. According to the fresh-keeping method for the tussah, the integrity of a cell structure is maintained, juice loss is reduced, and abnormal release of endogenous enzyme is inhibited, so that nutritional ingredients are better reserved in the long-term freezing storage process, and the sensory characteristics of compact meat, uniform color and luster and no peculiar smell are maintained.

The invention discloses a soil cation exchange capacity detection method based on color developing solution image recognition, and relates to the technical field of soil physicochemical property detection. Comprising the following steps: acquiring a supernatant image after a soil sample of to-be-detected soil reacts with a methylene blue solution under a multi-light-source condition; zero-sample semantic segmentation is carried out on color blocks in the supernatant image to extract position information of different color developing areas in the color blocks, and color partitions are obtained; performing color correction on the color subareas to eliminate color deviation of the color subareas under different light source conditions to obtain RGB parameters of the methylene blue circular color development area; and inputting the RGB parameters into an extreme gradient lifting algorithm so as to fit a numerical relationship between the color concentration of the color developing area and the soil cation exchange capacity, thereby obtaining the soil cation exchange capacity of the soil to be detected. According to the method, a complex chemical detection process is converted into a visual calculation task, and an artificial chemical process depending on multiple ion exchange, washing and titration is simplified.

The invention discloses an erbium-doped zinc selenide composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving zinc nitrate hexahydrate and erbium nitrate hexahydrate in deionized water, wherein the molar ratio of erbium ions in the zinc nitrate hexahydrate is 0.02-0.08; adding sodium selenite and sodium hydroxide; adding a reducing agent hydrazine hydrate; after hydrothermal reaction for h, washing and drying to obtain the erbium-doped zinc selenide composite material. The material is of a cubic phase ZnSe structure, erbium is uniformly doped in crystal lattices, and the material is in a nearly spherical particle shape. Rich 4f electronic defect states are introduced into a ZnSe band gap through erbium doping, charge transfer (chemical enhancement) is remarkably promoted, the free carrier concentration is improved to excite localized surface plasma resonance (electromagnetic enhancement), and the synergistic effect of two enhancement mechanisms is achieved. The detection limit of the SERS substrate to methylene blue is as low as 3.24 * 10 <-8 > mol / L, the enhancement factor is as high as 1.73 * 10 < 4 >, and a new way is provided for environmental pollutant monitoring.

An optical fiber photoelectric sensor for synchronously detecting NT-proBNP and cTnI comprises an optical fiber, and a sensing area Zone I and a sensing area Zone II which are independent in function are etched on the optical fiber. Au NPs layers are modified on the surfaces of two sensing areas with independent functions to enhance the photoelectrochemical activity, bismuth oxyiodide nanoflowers and NT-proBNP aptamers are fixed on the surface of Zone I to serve as functional elements, and the specific detection of NT-proBNP is realized by excitation with the wavelength of 450 nm; a dsDNA structure containing a cTnI aptamer is fixed on the surface of Zone II, methylene blue is embedded into dsDNA, and the wavelength of 650 nm is used as an excitation light source to specifically detect cTnI. According to the invention, synchronous detection of NT-proBNP and cTnI can be realized, and the reliability of a detection result is improved.

This invention discloses a method and application for preparing metal-doped composite catalysts based on ZIF-67, relating to the field of wastewater treatment technology. This invention constructs a multi-component synergistic system through the coordination of functional groups on the surface of biochar with ZIF-67 and the electronic coupling effect between rare earth metals and Co. Compared with traditional pure chemical support synthesis methods, this reduces costs and improves environmental compatibility. The metal-doped composite catalyst prepared by this invention is a novel heterogeneous catalyst. Through the electrostatic interaction between the biochar support and Co ions, and the metal-metal bonds formed between La / Ce and Co, it significantly enhances the stability of Co ions, effectively avoiding secondary pollution. The metal-doped composite catalyst prepared by this invention can efficiently activate persulfate to generate reactive oxygen species and synergistically remove multiple pollutants from complex water bodies containing sulfamethoxazole, tetracycline, levofloxacin, and other antibiotics such as methylene blue.

The invention provides a living cell surface double-tumor marker in-situ detection method based on a closed bipolar electrode (cBPE) array and an electrochemiluminescence (ECL) technology. The living cell surface double-tumor marker in-situ detection method is used for synchronously quantifying carcino-embryonic antigen (CEA) and alpha-fetoprotein (AFP). According to the system, the high specific surface area, the ordered porous structure and the rich surface amino active sites of a covalent organic framework (COF) material are utilized, and the excellent conductivity and biocompatibility of gold nanoparticles (Au NPs) are combined, so that the bifunctional signal probe COF (at) Au (at) MBApt is constructed. The probe can simultaneously load a large number of signal molecule methylene blue (MB) and is coupled with a targeting aptamer (Apt), so that high-capacity labeling and specific recognition of a target marker are realized.

The application discloses a CuS / Cu3(MoO4)2(OH)2 composite and a preparation method and application thereof. The CuS / Cu3(MoO4)2(OH)2 composite material is prepared by using CuCl2, Na2MoO4 and Na2S as raw materials and adopting a hydrothermal method. The CuS / Cu3(MoO4)2(OH)2 composite acoustic catalyst provided by the application can be used for ultrasonic catalytic degradation of organic pollutants in cooperation with H2O2. When the ultrasonic power is 500 W and the ultrasonic time is 30 min, the degradation rates of acid orange 7, tetracycline, rhodamine B, congo red, methylene blue and basic red 2 in water can reach 89.6(±5.78)%, 92.91(±0.36)%, 96.93(±0.16)%, 97.73(±0.61)%, 98.53(±0.37)% and 99.87(±0.18)%, respectively.

The invention relates to the technical field of resin preparation, in particular to zirconium-loaded chromium removal resin as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing methyl acrylate, divinyl benzene and dibenzoyl peroxide to obtain a homogeneous organic mixture; mixing water, cellulose, sodium chloride and the methylene blue solution to obtain a mixture; mixing the homogeneous organic mixture, the mixed material and a pore-foaming agent, then carrying out heat treatment, recovering the pore-foaming agent to obtain a polyacrylic acid-divinylbenzene copolymer, and the like, so as to obtain the zirconium-loaded chromium-removing resin. The zirconium stability of the zirconium-loaded chromium removal resin is very good, and the resin-loaded zirconium shedding rate is less than 50% after the resin is soaked in 1 + 1 hydrochloric acid for 48 h; the zirconium-loaded chromium removal resin can effectively remove chromium metal in the cobalt chloride solution, the chromium metal is less than 0.01 mg / L, and the requirements of customers are met.

The application provides a spherical lignin-phenolic resin and a preparation method and application thereof in adsorbing N-containing organic dyes, and belongs to the technical field of adsorbing materials. The lignin-phenolic resin with regular spherical morphology is prepared by one-step condensation polymerization reaction through the reverse suspension polymerization method under acid catalysis, wherein lignin, hydroquinone and trioxane are used as raw materials. The lignin belongs to renewable resources, has the characteristics of low cost and environmental friendliness, can replace phenol as the main phenol source, and the replacement rate can reach 75%. The yield of the synthesized phenolic resin is as high as 60-80%. In addition, the monomer type can be selected to introduce rich phenolic hydroxyl groups, sulfonic acid groups and other oxygen-containing groups in the resin, the monomer ratio is controlled to change the crosslinking structure of the resin, the adsorption capacity of the resin for N-containing organic dyes is effectively improved, and efficient adsorption of rhodamine B and methylene blue can be realized.

The application discloses a kind of preparation and application of light evaporation-light catalysis coupling hydrogel, using preparation hydrogel is placed on the surface of various sewage (seawater, methylene blue solution, tetracycline solution), carry out light evaporation-light catalysis coupling process under solar drive to handle sewage, and collect evaporation water and concentrated water, determine water quality change situation.The application proposes a simple one-pot solvothermal method to synthesize MWCNTs@NH2-MIL-88B(Fe) composite material, and then load it into a double network hydrogel composed of PVA and gelatin.Using the high light absorption capacity and superior electron transfer ability of MWCNTs, combined with the unique Fenton effect of NH2-MIL-88B(Fe) (NM88B), the hydrogel with rich pore structure can simultaneously perform photocatalytic degradation and photovoltaic evaporation processes, ultimately achieving the removal of clean water and organic pollutants.

The invention provides a molecular classifier for detecting gastric cancer miRNA. A preparation method of the molecular classifier comprises the following steps: depositing a PABA modification layer on the surface of a screen-printed electrode; activating carboxyl on the surface of the para aminobenzoic acid modification layer by adopting an EDC / NHS composite system; carrying out amination modification on an MXene material, and coating the surface of the activated para aminobenzoic acid modification layer with the modified MXene material to form an MXene functional layer; depositing gold nanoparticles on the surface of the MXene functional layer to obtain an electrochemical activity sensing interface; a signal reporter molecule is combined with an aptamer probe, the signal reporter molecule is a DNA tetrahedron-methylene blue complex, and the combined complex is dropwise added on the surface of an electrochemical activity sensing interface, so that the aptamer probe is combined on the surface of the electrochemical activity sensing interface. The molecular classifier can be used for preparing gastric cancer miRNA detection products, and the problems that in the prior art, a classifier is high in complexity and high in signal leakage risk are solved.

The present application relates to a kind of functional materials for organic dye adsorption and degradation and its preparation method and application, belong to pollutant degradation field.The present application uses one-step hydrothermal synthesis method, with anhydrous ferric chloride, tin chloride tetrahydrate and sodium hydroxide as raw material, successfully constructs the Fe (Sn (OH) 6) / FeSnO (OH) 5 heterojunction composite material with close interface combination.The material can realize the efficient removal of typical organic pollutants methylene blue at normal temperature and pressure, and the degradation rate can reach more than 90% in a short time, showing excellent adsorption and degradation performance.The present application has simple process, mild reaction condition, low raw material cost, avoids complex post-processing process, has good scalability and application potential.The material can provide an efficient, economical technical solution for the treatment of refractory organic pollutants in water, has significant environmental benefits and practical application value.

This invention discloses a method for preparing and using a magnetic Fenton-type catalytic carbon sheet, comprising the following steps: S1, weighing glucose and ferric chloride in a mass ratio of 5:1 and adding them to a 500mL beaker, adding 200mL of purified water, and stirring until completely dissolved; S2, sonicating the solution in a water bath at 80℃ for 3 hours, slowly adding 0.1mmol / L NaOH until the pH value is 9-11, and continuing sonication for 1 hour; S3, pouring the solution into a ceramic double-layer crucible, placing it in a vacuum drying oven and heating it at 102℃ for 24 hours, then calcining it in a muffle furnace at 700-800℃ for 2-5 hours, and removing it after the temperature drops to room temperature; S4, grinding it thoroughly in an agate mortar, passing it through a sieve, washing it successively with pure water and anhydrous ethanol, and magnetically filtering it; S5, placing the filter cake in a vacuum drying oven and drying it at 102℃ for 6 hours. h. Store in a sealed container. The magnetic Fenton-like catalytic carbon sheet prepared by this invention has uniform nano-Fe3O4 particles, high dispersibility, and a high specific surface area, making it valuable for the efficient removal of methylene blue from water.

This invention belongs to the field of nanofiltration membrane technology, and particularly relates to a polyamide nanofiltration membrane, its preparation method, and its application. The polyamide nanofiltration membrane provided by this invention includes an ultrafiltration membrane and a polyamide selective layer attached to the ultrafiltration membrane. The polyamide selective layer is formed by a polycondensation reaction of a fully amino columnar aromatic hydrocarbon [5] and 1,3,5-benzenetricarboxyl chloride. The polyamide nanofiltration membrane of this invention can separate organic micropollutants such as Congo red, Rhodamine B, methylene blue, and methyl orange dyes, with a rejection rate of more than 95%. It also has good separation performance for some inorganic salts, with a rejection rate of more than 50%. The polyamide nanofiltration membrane of this invention can adapt to some harsh acid and alkali environments while maintaining excellent rejection performance. The polyamide nanofiltration membrane provided by this invention also has excellent antifouling performance.