1495 results about "Iron chloride" patented technology

The invention relates to the technical field of biocatalysts, in particular to a FeCo-NC bimetallic monatomic nano-enzyme as well as a preparation method and application thereof. The preparation method of the nano enzyme comprises the following steps: preparing Co-ZIF-8 from zinc nitrate, cobalt nitrate and 2-methylimidazole; the Co-ZIF-8 and ferric chloride are used for preparing the FeCo-NC bimetallic monatomic nano-enzyme, the molar ratio of the zinc nitrate to the cobalt nitrate is (20-30): 1, and the molar ratio of the cobalt nitrate to the ferric chloride is (2-6): 1. The nano-enzyme prepared by the embodiment of the invention is of a monatomic structure, has double-enzyme activity, can simultaneously simulate catalase and NADH oxidase, and has the capability of removing active oxygen.

The invention provides a novel method for synthesizing 1, 4-bis (4-fluorobenzoyl) benzene, which belongs to the technical field of aromatic halide production, and comprises the following steps: under inert gas, adding supported solid acid and fluorobenzene into a reaction container; the preparation method comprises the following steps: dropwise adding paraphthaloyl chloride into a reaction container, and reacting at 5-30 DEG C for 1-8 hours to obtain 1, 4-bis (4-fluorobenzoyl) benzene; carrying out purification treatment on the reaction system to obtain 1, 4-bis (4-fluorobenzoyl) benzene with the purity of 97.2% or above; the supported solid acid is composed of a carrier and Lewis acid; lewis acid is selected from any one of aluminum chloride, ferric chloride, titanium tetrachloride and zinc chloride; the carrier is selected from any one of an HY molecular sieve, an Hbeta molecular sieve, a ZSM-5 molecular sieve, acid-treated K10 montmorillonite, aluminum oxide and an MCM-41 molecular sieve. The reaction system condition is mild, the product purity is larger than or equal to 97.2%, after the condition is optimized, the purity is larger than 99.5%, the product and the catalyst can be separated through filtering, waste salt is avoided, the catalyst can be recycled, and the reaction is green and environmentally friendly.

The invention discloses a preparation method of antistatic modified chinlon filaments, and relates to the field of chinlon filaments. When the antistatic modified chinlon filament is prepared, (formylmethyl) diethyl phosphate and 1-aminopyrrole react to prepare pyrrole diethyl phosphate; reacting the hydroxylated multi-walled carbon nanotube with pyrrole diethyl phosphate to obtain a modified multi-walled carbon nanotube; the preparation method comprises the following steps: reacting 2, 2 '-bipyridine-5, 5'-dicarboxylic acid with 2-amino-5-nitrophenol, and then reducing to obtain a benzoxazole diamine monomer; then, adipic acid, 1, 5-diaminopentane and a benzoxazole diamine monomer are subjected to a reaction, and modified polyamide is prepared; uniformly mixing the modified polyamide, the modified multi-walled carbon nanotubes, pyrrole, ferric trichloride and copper chloride, and performing melt spinning to obtain the antistatic modified polyamide filament. The antistatic modified chinlon filament prepared by the invention has excellent antistatic, flame-retardant, anti-aging and mechanical properties.

The invention provides a preparation method of calcium-modified ferrihydrite and application of the calcium-modified ferrihydrite in improvement of a soil structure, and belongs to the technical field of soil structure improvement. The preparation method of the modified ferrihydrite comprises the following steps: gradually adding a sodium hydroxide solution into a ferric trichloride solution, and stirring and mixing until the pH value of a suspension reaches neutral; aging the suspension at room temperature for 12 hours, centrifuging to remove supernate, and washing the synthesized ferrihydrite with pure water for 2-3 times; then adding a calcium chloride solution for salt washing for 2-3 times so as to fully replace sodium ions on the surface of ferrihydrite into calcium ions; and washing with pure water for 2-3 times to obtain the calcium modified ferrihydrite. The calcium modified ferrihydrite provided by the invention eliminates the influence of dispersive sodium ions or potassium ions in ferrihydrite synthesized by a traditional method, is a nanoscale weak crystalline mineral, has the effect of rapidly improving the stability of soil aggregates, can rapidly aggregate soil particles after being applied to soil, effectively enhances the structural stability of the soil, and improves the soil quality. Therefore, good materials and means can be provided for soil structure improvement.

This invention discloses a method for leaching lithium iron phosphate mixed powder with iron salts and recovering all components, belonging to the field of battery recycling. The invention uses an iron salt solution to leach the mixed powder, obtaining a lithium-containing leachate and leaching residue. Ferrous ions in the leachate are regenerated into ferric iron through acidification and oxidation, and recycled for leaching the next batch of mixed powder. After reaching a preset number of cycles, the leachate is used for re-leaching multiple batches of leaching residue to improve the lithium leaching rate. Ultimately, a enriched solution containing Li, Fe, Cu, and Al and graphite-containing iron phosphate residue are obtained. Copper is recovered from the enriched solution through iron powder replacement, and a high-purity lithium chloride solution is obtained through extraction and separation, while ferric chloride (recycled) and aluminum chloride crystals are also recovered. The leaching residue is treated with hydrochloric acid to obtain regenerated graphite, and the pH is adjusted with alkali to obtain high-purity iron phosphate. This method achieves full component recovery under mild conditions, reducing separation steps and chemical consumption through a "leaching-regeneration-leaching" cycle mechanism, thus achieving both environmental and economic benefits.

The invention relates to a preparation method and application of a mine water flocculation agent with an adsorption function. The mine water flocculation agent is prepared from the following raw materials: a mineral material, chitosan, water, silicate, acid, aluminum chloride salt, ferric chloride salt and polyacrylamide. The preparation method comprises the following steps: carrying out heat treatment on a mineral material, then adding water and chitosan, then adding silicate, reacting to generate polysilicic acid, grafting the polysilicic acid on chitosan macromolecules, then adding aluminum chloride salt and ferric chloride salt, reacting, finally adding polyacrylamide, and aging to obtain the composite material. The mine water flocculating agent provided by the invention can synchronously remove suspended matters, fluorides and COD (Chemical Oxygen Demand), and has the advantages of low dosage, short reaction time and high settling speed.

The invention discloses a heavy metal chelating agent for industrial wastewater and a preparation method of the heavy metal chelating agent, and belongs to the technical field of sewage treatment.The preparation method comprises the steps that 2-hydroxyphenylboronic acid is subjected to graft modification through acrylic acid and polymerized on the surface of activated biomass porous carbon powder with acrylic acid, boron-containing polymer modified porous carbon is obtained, and then ferric chloride hexahydrate serves as an iron source; a boron-containing polymer modified porous carbon surface and aminated magnetic adsorption nanospheres are obtained, B-N coordination is formed between the aminated magnetic adsorption nanospheres and the boron-containing polymer modified porous carbon surface, boron element fixation is achieved through modified copolymerization, loss caused by long-time use of the boron element is avoided, lasting and stable chelation is guaranteed, activated biomass porous carbon serves as a carrier, and macromolecular resin serves as a coating layer. The environment-friendly biochar has the advantages of favorable degradability, greenness, degradability, safety and high efficiency, and avoids the problem of secondary pollution caused by the use of a chelating agent.

The invention provides a leakage point pressure difference response high-strength blocking agent based on iron ion dynamic cross-linked latex and a preparation method thereof, and the raw materials comprise the following components in parts: 60-120 parts of latex, 60-120 parts of deionized water, 5-15 parts of an activator, 5-10 parts of a defoamer, 100 parts of a terminator, 100 parts of a stabilizer, 10 parts of a 20% ferric chloride solution, and the balance of water. Rubber particles are dynamically crosslinked through ferric ions, and the plugging strength is remarkably improved. Compared with a traditional differential pressure plugging agent, the plugging strength for small holes with the diameter of 0.5 mm reaches 35.67 MPa and is improved by about 238%, and the plugging strength for large holes with the diameter of 1 mm reaches 9.68 MPa and is improved by about 428%. And the plugging device is suitable for plugging conditions with higher leakage point pressure difference. In addition, the plugging agent can realize rapid and high-strength plugging of an underground pipe column, and provides a more efficient and more reliable solution for well site construction.

The invention provides a preparation method and application of boron isotope separation resin microspheres. The preparation method comprises the following steps: (1) adding dimethyl sulfoxide into polystyrene-divinylbenzene resin microspheres to swell for 3 hours, adding concentrated sulfuric acid to treat until the sulfonation rate is 0.3-0.4 meq / g, washing with water, treating with an ammonium chloride aqueous solution, washing with water, drying in vacuum, atomizing and spraying a ferric chloride-ferrous chloride aqueous solution, evaporating in vacuum to remove part of water, and introducing ammonia-containing nitrogen flow to treat to obtain polystyrene-divinylbenzene resin microspheres; and washing with water, grinding the surface, treating with a sodium hydroxide aqueous solution and washing with water. The boron isotope separation resin microspheres are suitable for chromatographic separation of 10B and 11B in a boric acid-sodium hydroxide aqueous solution with the pH of 6-7.5, a desorption solution is pure water, the feeding rate is 0.3-0.6 m / h, and a boric acid-containing aqueous solution enriched with 10B can be obtained; the service life of the chromatographic column is more than 6 months, the adsorption separation performance is reduced by not more than 20%, and the chromatographic column has a certain application prospect.

The invention discloses a tannic acid modified lignin phenolic resin antibacterial adhesive and a preparation method thereof, and belongs to the technical field of bio-based adhesives. Alkali lignin is used as a raw material to prepare lignin nano-particles, then ferric trichloride and tannic acid are used for modifying the lignin nano-particles, and the tannic acid modified lignin phenolic resin antibacterial adhesive is prepared. Gallotannic acid / iron complexed lignin nano-particles are obtained, the gallotannic acid / iron complexed lignin nano-particles, phenol, formaldehyde and alkali liquor are mixed, and the lignin phenolic resin adhesive is prepared through an addition condensation reaction. The lignin phenolic resin adhesive prepared by the invention can realize high-proportion phenol substitution, has a good photo-thermal antibacterial effect, and provides a new way for development of an antibacterial environment-friendly adhesive.

The invention belongs to the technical field of pollutant detection, and relates to an iron-based nano enzyme and application thereof in quinolone antibiotic detection. The preparation method comprises the following steps: adding ferric trichloride hexahydrate and cerium nitrate hexahydrate into water, uniformly mixing to obtain a mixed solution A, uniformly mixing the mixed solution A with an organic polyacid ligand solution, and then carrying out a reflux reaction to prepare a Ce / Fe-MOF precursor; and adding the Ce / Fe-MOF precursor and sodium hypophosphite into a tubular furnace, and calcining in a nitrogen atmosphere to prepare Ce / Fe-P. According to the present invention, the synthesized material has the nanometer prism mesoporous structure, the contact area with the substrate is effectively increased, the visual detection of the NOR can be achieved based on the principles of low-concentration NOR activity improving and high-concentration Ce / Fe-P activity inhibition, and the high sensitivity, the low detection limit, the wide linear response range and the good selectivity and the good stability are provided.

The invention provides a material for removing sodium ions in saline-alkali soil and a preparation method, and relates to the field of sodium ion adsorbents, the preparation method comprises the following steps: (1) lignin modification: under a water bath condition, dissolving sulfate lignin in a mixed solution of analytically pure acetic acid and 30% hydrogen peroxide, then adding ferric chloride, reacting for 1.5-2.5 hours, diluting with distilled water by 7-8 times, centrifuging and washing to obtain modified lignin; drying to obtain oxidized lignin; (2) hydrogel synthesis: mixing and stirring the oxidized lignin and analytically pure acrylic acid, adding a cross-linking agent and an initiator, and reacting in a drying oven at 65-75 DEG C for 1.5-2.5 hours to form a sodium ion adsorption material with a porous interpenetrating network structure; by modifying the lignin, particularly introducing more hydroxyl and carboxyl groups, the performance of the lignin in the application of adsorbing ions, preparing hydrogel and the like can be improved.

The invention discloses a high-pressure belt conveyor low-cost sludge dewatering technology, and relates to the technical field of sludge dewatering, the technology comprises the following steps: S1, in a pretreatment stage, adding a ferric chloride agent and destroying a sludge colloid structure; s2, in the conditioning stage, lime powder is added to adjust the pH value, and a porous skeleton structure is constructed; s3, adding a polyacrylamide medicament in a flocculation stage to form a compact floc; s4, a high-pressure belt filter press is used for mechanical dehydration in the dehydration stage; s5, recovering the filtrate for redissolving the medicament; s6, performing dynamic linkage optimization of chemical dosing and filter pressing parameters through a dynamic chemical dosing algorithm of the control system; the dosage of chemicals is effectively reduced, the sludge dewatering effect is improved, the sludge dewatering treatment cost is reduced, and the cyclic utilization of resources is realized; the technical problems that an existing sludge dewatering technology is too high in agent cost, low in agent matching and combination reliability and insufficient in technology adaptability are solved.

The invention relates to a sludge biochar modified layered bimetallic oxide, and a preparation method and application thereof. The modified layered bimetallic oxide is prepared from the following main raw materials: domestic sewage aeration tank sludge, NaOH, Na2CO3, FeCl3. 6H2O and MnCl2. 4H2O. The domestic sewage aeration tank sludge is used for preparing dry sludge, the ferric chloride solution and the manganese chloride solution are used for preparing sludge composite layered double hydroxides, and the final layered bimetallic oxide composite sludge biochar catalyst can be prepared by calcining the sludge composite layered double hydroxides. The modified layered bimetallic oxide prepared by the scheme of the invention can effectively degrade bisphenol A, has relatively strong reusability, and still keeps good degradation ability in a relatively wide pH environment.

According to the method, phosphomolybdic acid, copper chloride and ferric chloride serve as precursors, copper and iron-containing phosphomolybdic acid nano-enzyme (Cu, Fe-PMs) with peroxidase-like activity is synthesized through a microwave method, under the acidic condition, on one hand, the surface of Cu and Fe-PMs carries negative charges, high affinity is generated between Cu and Fe-PMs and a substrate TMB with positive charges, and on the other hand, the surface of Cu and Fe-PMs has negative charges; on the other hand, Cu / Fe / Mo three-metal redox couple accelerates the regeneration of Fe < 2 + > and plays an important role in the activity of peroxidase, and meanwhile, due to the introduction of sodium dehydroacetate, Cu and Fe in Cu and Fe-PMs and pyranoid ring and keto O in sodium dehydroacetate interact through coordinate bonds to cause electron interaction, so that the peroxidase-like activity of Cu and Fe-PMs is enhanced, and the peroxidase-like activity of Cu and Fe-PMs is improved. And the Fenton reaction is enhanced through transfer of electrons among the sodium dehydroacetate, the Cu and the Fe-PMs. When Cu and Fe-PMs oxidize TMB and H2O2, sodium dehydroacetate enhances the absorbance of the system, and on the basis, a novel colorimetric rapid detection method of sodium dehydroacetate is established.

The invention discloses a preparation method of a wool-based nitrogen-doped magnetic biochar material, which comprises the following steps: firstly, impregnating impurity-removed and scale-removed wool in a ferric chloride solution for coordination reaction to obtain a wool / iron complex; adding melamine, metal salt and the wool / iron complex into deionized water, sealing to form a closed environment, and then vibrating to uniformly disperse the metal salt and melamine on the surface of the wool; taking out and drying until no water exists to obtain a metal salt / melamine / wool mixture; carbonizing the mixture in an oxygen-free environment, and removing metal salt and impurities in the product; and drying to obtain the wool-based nitrogen-doped magnetic biochar material. The magnetic biochar material loaded with magnetic nanoparticles is prepared from wool, has excellent adsorption effect and adsorption catalysis effect on complex mixed dye liquor, achieves catalysis and adsorption synergistic integration, has superparamagnetism, and can realize solid-liquid separation and recovery by setting an external magnetic field.

The invention discloses a preparation method for selectively oxidizing thioether into sulfoxide through photo-initiation, and belongs to the field of synthesis of medical compounds. The preparation method comprises the following steps that in the air atmosphere, a thioether compound is dissolved in an acetonitrile-water mixed solvent, inorganic metal salt catalysts such as ferric chloride and copper sulfate are added, the mixture reacts for 8-48 h at the temperature of 0-45 DEG C under illumination with the wavelength of 295-405 nm, selective oxidation is carried out, and the sulfoxide product is obtained, and the molar ratio of thioether to the catalysts is 5: 1. The method overcomes the problems of excessive oxidation risk, complicated operation, environmental pollution and the like caused by dependence of a noble metal catalyst and use of a strong oxidant in the existing thioether oxidation method, has the advantages of high catalytic efficiency, high yield and excellent selectivity, can greatly reduce the production cost, is suitable for later industrial synthesis and amplification, and has wide application prospects. The method has the advantages of no expensive metal catalyst or oxidant, simple preparation process, high efficiency, environmental protection, safety and cost saving.

The invention discloses a chlorobenzene wastewater continuous stripping purification recovery device and an implementation method, the chlorobenzene wastewater continuous stripping purification recovery device comprises an aeration tank, an alkali water washing system, an acid water washing system, an acid-base neutralization system and a ferric hydroxide separation system, the aeration tank is connected with the alkali water washing system, the acid water washing system is connected with the alkali water washing system, and the acid water washing system is connected with the ferric hydroxide separation system. The acid-base neutralization system is connected with the alkali-water washing system, the acid-water washing system and the ferric hydroxide separation system, and the alkali-water washing system and the acid-water washing system are both in two-stage steam stripping, and have the following advantages: alkali washing water and acid washing water generated in the chlorobenzene production process are subjected to two-stage nitrogen steam stripping, so that the content of organic matters is greatly reduced; ferric hydroxide is generated through neutralization of acid-alkali wastewater, the total amount of the wastewater is reduced, then the ferric hydroxide reacts with hydrochloric acid in the pickling water to generate ferric trichloride, hydrochloric acid is neutralized, the neutralization product ferric hydroxide is consumed, the wastewater amount is reduced, and recycling of wastewater resources is achieved.

The invention discloses a solar photovoltaic cable sheath material and a tear-resistant photovoltaic cable, and belongs to the field of photovoltaic cable manufacturing. The sheath material comprises the following components in parts by weight: 70-120 parts of ethylene propylene rubber, 10-13 parts of crosslinked polyethylene, 3-7 parts of zinc oxide, 1-4 parts of stearic acid, 1-2 parts of paraffin, 2-5 parts of an anti-aging agent RD, 8-12 parts of zinc borate, 150-200 parts of a reinforcing agent, 10-12 parts of high abrasion furnace black, 9-13 parts of tricresyl phosphate, 9-13 parts of red phosphorus, 0.5-1 part of an accelerant TMTD, 3-5 parts of DCP and 1-2 parts of HVA-2. The reinforcing agent composed of sodium silicate, ferric chloride and aluminum hydroxide is added into the sheath material, so that when the sheath material is damaged, sodium silicate and ferric chloride react under the influence of air moisture to generate colloidal silicic acid carrying ferric hydroxide and aluminum hydroxide, and the damaged part is filled with the colloidal silicic acid; and meanwhile, the aluminum hydroxide can promote the colloidal silicic acid to be dried, so that the damaged part is repaired, and the situation that the tear resistance of the cable is remarkably worsened due to damage is avoided.

The invention provides a composite polyaluminum ferric chloride water purifying agent as well as a preparation method and application thereof, and belongs to the technical field of waste resource recycling and municipal sewage treatment. The industrial hazardous waste aluminum ash is subjected to innocent treatment and then reacts with the pickling steel waste liquid of the steel mill, and the polyaluminum ferric chloride meeting the industrial standard is prepared. The polyaluminum ferric chloride and a cationic adsorbent are compounded according to a specific proportion to obtain the composite polyaluminum ferric chloride water purifying agent. According to the method provided by the invention, the resource recycling of hazardous wastes is realized, and the composite polyaluminum ferric chloride water purifying agent obtained by the method is used for treating municipal sewage, so that the treated water quality can reach the first-grade discharge standard A.

The invention discloses a coagulant material, a preparation method and application, and the method comprises the following steps: adding a silane coupling agent into water for pre-hydrolysis to obtain a pre-hydrolysis solution; secondly, a mixed solution of aluminum chloride and ferric chloride is prepared and stirred to be completely dissolved and evenly mixed, and the mass ratio of aluminum chloride to ferric chloride is 9: 1-5: 5; the pre-hydrolysis solution and a mixed solution of aluminum chloride and ferric chloride are mixed and stirred evenly, and the ratio of the total substance mass of silicon to ferro-aluminum in the silane coupling agent is 0.1-0.5; dropwise adding a sodium hydroxide solution into the mixed solution, and adjusting the alkalization degree until the mass ratio of [OH] to [Al + Fe] is 1-2; and standing and curing the solution of which the alkalization degree is adjusted to obtain the aluminum-iron covalent composite coagulant. The coagulant has the advantages of efficient fluorine removal capability, rapid floc growth, good settling performance, low aluminum residue and the like, and is suitable for wide pH range and water quality conditions.

The invention belongs to the technical field of synthetic purifying agents, and discloses a multipurpose synthetic purifying agent and a use method thereof, and the purifying agent comprises the following components in percentage by weight: 18-50% of ferric trichloride; 2-37% of polyaluminum ferric chloride; 10 to 60 percent of calcium chloride dihydrate; 22 to 52 percent of ferrous sulfate; 5-45% of polyaluminum chloride; 10-30% of basic aluminum chloride; according to the invention, COD in wastewater can be rapidly removed, the pH value is neutralized, the hydrophilicity is changed, a diffusion layer is compressed, the counter-ion effect is increased, and the purpose of oxidation reduction is finally achieved; in the hydrolysis process, a surfactant and various pollution factors in wastewater can be effectively adsorbed and polymerized into jelly, and the jelly is rapidly precipitated and separated in a short time, so that the wastewater is purified.

The invention discloses a preparation method of a porous carbon material, which comprises the following steps: mixing indigo blue and ferric chloride, and pyrolyzing in a protective atmosphere to obtain the porous carbon material. The porous carbon material is prepared by taking indigo blue as a precursor and ferric chloride as an activating agent, the preparation method of the porous carbon material has the advantages of atom economy, simplicity in operation and low cost, the ultrahigh yield of the porous carbon material can be obtained, and the preparation method is suitable for large-scale industrial popularization and application.

The present invention relates to the technical field of preparation of adsorbent materials for removing heavy metals from acidic wastewater, specifically a method for preparing a resin-based magnetic composite adsorbent material, comprising the following steps: using waste expanded resin as a base carrier, ferric chloride as an added magnetic auxiliary substance, mixing magnesium sulfate and aluminum sulfate evenly, stirring at high speed and ultrasonic dispersion, then adding sodium phosphite and sodium hypophosphite and placing them in a microwave reactor, adjusting the pH of the sodium phosphite and sodium hypophosphite in the reactor to precipitate, while the phosphite intercalates into the precipitate, finally filtering the precipitate and washing and drying to obtain a novel adsorbent material for excellent adsorption of heavy metals in acidic mine wastewater. The material prepared by the present invention can effectively adsorb various heavy metal ions such as cadmium, chromium, zinc, lead, manganese, copper, etc. in acidic mine wastewater, has a large adsorption capacity, and the adsorbent material has magnetism and can be regenerated by solid-liquid separation through magnetism.

The present invention discloses a method for synthesizing 9-bromoanthracene. Anthracene and potassium bromide are used as raw materials. The final product, 9-bromoanthracene, is obtained by reacting anthracene and potassium bromide in the presence of ferric chloride and 1-acetoxy-1,2-benzidoxyl-3-(1H)-ketone. The method has the advantages of being inexpensive and readily available, easy to produce, and readily purifiable, and can be developed into an industrialized production method.

The invention discloses a method for preparing ferric trichloride and / or phosphoric acid from residues obtained after lithium extraction of failed lithium iron phosphate, which comprises the following steps: S1, taking the residues obtained after lithium extraction, and adding a leaching agent for leaching to obtain a leachate 1 and residues 1; s2, an extraction agent is added into the leachate 1 for extraction, the pH of an oil-water mixed homogeneous phase is controlled to be 0.2-1.0, and phosphorus-containing extraction raffinate 1 and an organic phase containing ferric trichloride are obtained; then the organic phase containing ferric trichloride is subjected to reverse extraction, and a ferric trichloride solution is obtained; the leaching agent in S1 is a hydrochloric acid solution, and the extracting agent in S2 is a tributyl phosphate solution. By the adoption of the method, iron and phosphorus in the slag obtained after lithium extraction are extracted respectively, ferric trichloride and wet-process phosphoric acid can be used for water treatment and chemical production respectively, and recycling of the slag obtained after lithium extraction is achieved.

The invention aims to provide a device and method for extracting iron from red mud and preparing iron oxide red, and belongs to the technical field of resource utilization, hydrochloric acid is adopted to leach iron element in the red mud, and a ferric chloride solution is separated from leachate through an extraction process. And then, carrying out alkali precipitation, washing and firing to prepare the high-purity iron oxide red. By using the method disclosed by the invention, the iron resource in the red mud can be recycled, so that the dual purposes of resource utilization and environment-friendly treatment are achieved.

The invention belongs to the field of membrane pollution control, and particularly relates to a modification method for prolonging the service life and performance of a pervaporation membrane in seawater. According to the method, the pervaporation membrane is soaked in deionized water for treatment, so that anticorrosive substances on the surface of the membrane are stripped, the soaked pervaporation membrane is pasted in a membrane assembly, then the membrane assembly is soaked in a tannic acid solution for 60 s, and after soaking is finished, the membrane assembly is taken out. The membrane assembly is taken out, the surface of the membrane is washed with deionized water and then moved into a ferric chloride solution to be soaked for 60 s, finally, the surface of the membrane is washed with deionized water, so that the polyphenol coating is successfully attached to the surface of the membrane, and the unique property of the polyphenol coating becomes the key for prolonging the service life of the membrane; when the PH is lower than 3, most-OH groups in the tannic acid are protonated, so that the polyphenol coating is disintegrated and separated from the pervaporation membrane, and pollutants accumulated on the surface of the membrane are removed at the same time. And subsequently. The surface of the pervaporation membrane is coated with a new polyphenol coating again, so that the service life of the pervaporation membrane is prolonged, and the method also has important significance in reducing the treatment cost of desalinated seawater.

The invention relates to the technical field of electro-catalysis, in particular to a modified iron monatomic catalyst based on biomass carbon as well as a preparation method and application of the modified iron monatomic catalyst. The preparation method comprises the following steps: mixing and stirring chitosan, an acetic acid solution, thiourea and ferric chloride, adjusting the pH value to 7.5-8.5, and freeze-drying to obtain an aerogel precursor; pre-carbonizing the aerogel precursor to obtain a pre-carbonized product; mixing the pre-carbonized product with an alkali reagent, and calcining to obtain a metal nanoparticle doped monatomic catalyst; and carrying out ultrasonic treatment on the metal nanoparticle doped monatomic catalyst by using a mixed acid solution, washing to be neutral, and drying to obtain the modified iron monatomic catalyst. By adopting the modified iron monatomic catalyst provided by the invention, non-polar CO2 molecules and NO3 <-> are efficiently converted into urea under mild conditions, the yield of the urea is up to 2978.6 mu g h <-1 > mgcat <-1 >, and the maximum Faraday efficiency is up to 30.4%.

The invention provides a wide pH applicable multi-biomolecule detection MOF probe, a preparation method, a detection method and application, the probe is an MIL-53 (Fe) (at) AA (at) EZ probe, and comprises a metal organic framework MIL-53 (Fe), amino acid and enzyme; the preparation method comprises the following steps: weighing terephthalic acid and ferric chloride hexahydrate, adding into N, N-dimethylformamide, mixing and stirring, pouring the mixed solution into a stainless steel autoclave, heating and reacting, naturally cooling to room temperature, centrifugally separating a product, and washing with N, N-dimethylformamide and absolute ethyl alcohol to obtain the metal organic framework MIL-53 (Fe). The preparation method comprises the following steps: mixing a metal organic framework MIL-53 (Fe) with an amino acid solution, and carrying out ultrasonic treatment and stirring to obtain an MIL-53 (Fe) coated AA solution; the method comprises the following steps: dissolving enzyme in an MIL-53 (Fe) (at) AA solution, uniformly mixing, stirring, centrifugally separating a product, taking precipitate, and drying in vacuum to obtain the MIL-53 (Fe) (at) AA (at) EZ probe. The pH application range is wide, one-step detection can be achieved, and the method has the advantages of being rapid in reaction, high in sensitivity, low in detection limit and easy and convenient to operate.