47 results about "CHLORIDE HEXAHYDRATE" patented technology

The invention discloses a flexible lanthanum zirconate-alumina fiber membrane as well as a preparation method and application thereof, and belongs to the technical field of inorganic nonmetal ceramic fiber materials. The preparation method comprises the following steps: dissolving zirconium oxychloride octahydrate, lanthanum chloride heptahydrate and aluminum chloride hexahydrate into absolute methanol, sequentially adding acetylacetone and triethylamine, stirring, and drying under reduced pressure to obtain a zirconium-lanthanum-aluminum polymer precursor containing triethylamine hydrochloride; soaking the zirconium-lanthanum-aluminum polymer precursor containing triethylamine hydrochloride in acetone, standing, filtering, concentrating under reduced pressure, and drying to obtain a zirconium-lanthanum-aluminum acetylacetone polymer precursor; the preparation method comprises the following steps: preparing a spinning solution from a zirconium-lanthanum-aluminum acetylacetone polymer precursor, absolute methanol serving as a solvent and polyoxyethylene serving as a spinning aid, and carrying out electrostatic spinning on the spinning solution to obtain a lanthanum zirconate-aluminum oxide precursor fiber membrane; and performing heat treatment on the lanthanum zirconate-aluminum oxide precursor fiber membrane to obtain the flexible lanthanum zirconate-aluminum oxide fiber membrane. According to the preparation method, acetylacetone is added into zirconium oxychloride, lanthanum chloride and aluminum chloride for coordination to form a linear zirconium-lanthanum-aluminum acetylacetone polymer, so that the technical problem that lanthanum zirconate long fibers with high strength and good flexibility are difficult to obtain is solved.

The preparation method comprises the following steps: mixing and stirring calcium chloride dihydrate, aluminum chloride hexahydrate, ethylene glycol, polyoxyethylene and formamide to obtain a clear and stable solution, cooling the solution to 0 DEG C, dropwise adding epoxypropane and gel, aging, drying wet gel, and drying to obtain the supported calcium-iron-based catalyst. A porous mayenite block is obtained after heat treatment, the porous mayenite block is ground and smashed to obtain CaO-Cal2Al14O33 powder, the molar ratio of the adding amount of calcium to the adding amount of aluminum is 24-36: 14, Fe is impregnated and loaded, the loading amount of Fe is 12-18 wt%, and the supported calcium-iron-based catalyst is prepared and used in biomass pyrolysis gasification. The porous mayenite block is used as the carrier, the dispersity of the active component iron is effectively improved, the calcium oxide content in the catalyst is controlled by controlling the calcium-aluminum ratio in the preparation process of the catalyst carrier, the carbon deposition resistance of the iron-based catalyst is effectively improved, and the H2 ratio in produced gas is increased.

The application belongs to the technical field of photocatalytic materials, and particularly relates to a semi-metal carbon nitride / metal organic framework MIL-53Fe heterojunction photocatalyst, a preparation method and application thereof. The mass ratio of the semi-metal carbon nitride and the metal organic framework MIL-53Fe is 1:10-3:10. The preparation method comprises the following steps: dissolving sodium tricyanomethanide and 1-butyl-3-methyl imidazole chloride in deionized water, and obtaining the semi-metal carbon nitride by using a thermal polymerization method; dissolving iron chloride hexahydrate and 1,4-benzenedicarboxylic acid in dimethylformamide, and then adding the semi-metal carbon nitride, and obtaining the semi-metal carbon nitride / metal organic framework MIL-53Fe heterojunction photocatalyst by using a hydrothermal method. The formation of the heterojunction can greatly improve the photocatalytic reduction activity of the semi-metal carbon nitride / metal organic framework MIL-53Fe on carbon dioxide.

The utility model relates to an aluminum mud recycling system which comprises an aluminum mud collecting chamber, a reaction tank, a first settling chamber and an aluminum chloride collecting chamber which are connected in sequence, an outlet of the aluminum chloride collecting chamber is connected with an evaporator which is sequentially connected with a crystallizer and a first filter, and an outlet of the first filter is further connected with an inlet of the evaporator. The other outlet of the aluminum chloride collecting chamber is connected with a polymerization chamber which is connected with a second settling chamber, and the second settling chamber is connected with the curing chamber through a second filter. The aluminum mud recycling system can be used for preparing aluminum chloride hexahydrate crystals and liquid polyaluminum chloride at the same time, and the prepared liquid polyaluminum chloride is high in purity and wide in application range.

This invention belongs to the field of tempered laminated glass technology, specifically relating to a bubble-free composite molding process for tempered laminated glass. A functional coating is also provided, which is prepared from the following components: modified silicone-acrylic emulsion, modified nano-cesium tungsten bronze, curing agent, dispersant, leveling agent, defoamer, silane coupling agent, ultraviolet absorber, film-forming aid, and deionized water. This invention utilizes the crosslinking modification of vinyltriisopropoxysilane and the grafting modification of vinylphosphonic acid to effectively improve the interfacial bonding force between the emulsion film and the glass substrate and functional fillers. Simultaneously, a modifier prepared by aminotrimethylenephosphonic acid and lanthanum chloride hexahydrate is used to modify the surface of nano-cesium tungsten bronze, solving the technical problem of easy agglomeration of unmodified nano-cesium tungsten bronze, thus laying the foundation for the high performance of functional coatings and tempered laminated glass.

The invention provides antibacterial hydrogel artificial skin and a preparation method thereof, and belongs to the technical field of 3D printing biomaterials, the antibacterial hydrogel artificial skin is prepared from the following raw materials by weight: 1-3 parts of aluminum chloride hexahydrate, 30-45 parts of water, 15-22 parts of graft modified chitosan, 8-15 parts of acrylamide, and 1-3 parts of N, N-dimethylformamide. The coating comprises the following components in parts by weight: 0.2-0.8 part of N, N '-methylene bisacrylamide, 0.5-1.5 parts of a photoinitiator, 6-12 parts of quaternized chitosan and 4-8 parts of nano-hydroxyapatite. Wherein the graft modified chitosan is prepared from the following raw materials: 5 to 10 parts of chitosan, 80 to 120 parts of acetic acid solution with the concentration of 2 percent, 0.8 to 2.5 parts of glycidyl methacrylate and 0.05 to 0.2 part of azodiisobutyronitrile. According to the application, by adopting a formula taking the grafted modified chitosan as a core, a collaborative design of multi-scale crosslinking and personalized 3D printing is formed, high mechanical strength, broad-spectrum long-acting bacteriostasis, precise form adaptation and excellent biocompatibility of the hydrogel are realized, and the clinical complex wound repair requirements are met.

The invention relates to the field of fuel and boiler systems, in particular to a coal gangue valuable element self-heating extraction system which comprises a feeding module, a crushing module, a decarburization activation module and a valuable element extraction module which are sequentially linked to form a closed loop. The feeding module adopts a belt type and spiral feeding combination; the crushing module is used for crushing the coal gangue until the particle size is below 2cm by using a jaw crusher; the temperature of the decarburization activation furnace is controlled at 750-850 DEG C, coal gangue decarburization, ash activation and rare earth calcination are achieved, flue gas is subjected to heat exchange to produce 300-450 DEG C high-temperature steam for energy supply, and bottom slag is ground to 200 meshes or below for standby application. The valuable element extraction comprises a magnetic separation iron removal sub-module, a hydrochloric acid leaching sub-module and the like, and the system adopts gradient energy utilization (high-temperature steam, medium-temperature steam and low-temperature steam are respectively used for acid leaching, aluminum chloride hexahydrate crystallization, extraction and white carbon black preparation). The system realizes the utilization of all components such as carbon and aluminum in the coal gangue, produces high-value products such as metal gallium and rare earth oxides, realizes self-heating to reduce energy consumption, is matched with an environment-friendly treatment unit, is adaptive to different coal gangue components, and is good in energy efficiency and economical efficiency.

This invention discloses a process and coating structure for rare earth modified trivalent chromium pearl chromium plating on zinc alloys. The process includes sequentially preparing a cyanide-free copper plating layer, a cyanide-free copper-zinc alloy plating layer, a high-corrosion-resistant nickel-phosphorus alloy plating layer, a bright nickel-cobalt alloy plating layer, a pearl nickel plating layer, a rare earth modified trivalent chromium pearl chromium plating layer, and an anti-discoloration protective film on a zinc alloy substrate. The rare earth modified trivalent chromium pearl chromium plating process is as follows: chromium chloride hexahydrate 90-130 g / L, potassium chloride 90-160 g / L, ammonium chloride 90-160 g / L, ammonium bromide 18-28 g / L, ammonium formate 40-60 g / L, boric acid 45-65 g / L, rare earth additives 8-12 mL / L, leveling agent 2-4 mL / L, accelerator 1-3 mL / L, plating bath pH 2.5-3.2, plating bath temperature 25-35℃, and cathode current density 8-16 A / dm². The rare earth additives have a synergistic effect on improving the performance of trivalent chromium plating solution. No rust was observed on the surface of the plated parts after undergoing a neutral salt spray test for 132 hours according to GB / T 10125–2021 standard.

The invention discloses an activated aluminum oxide modified activated carbon fiber felt and a preparation method and application thereof, and belongs to the technical field of adsorption materials, and the preparation method comprises the following steps: S1, preparing an activated activated carbon fiber felt; s2, adding urea and aluminum chloride hexahydrate into deionized water, stirring and dissolving, then adding the activated activated carbon fiber felt, stirring and mixing uniformly, transferring into a reaction kettle for reaction, cooling, taking out, washing and drying to obtain an aluminum oxide precursor modified activated carbon fiber felt; s3, transferring the alumina precursor modified activated carbon fiber felt into a tubular furnace, performing annealing treatment in a nitrogen atmosphere, and cooling to room temperature to obtain an activated alumina modified activated carbon fiber felt; the preparation method is simple and easy to implement, the used materials are wide in source and low in cost, and the prepared activated aluminum oxide modified activated carbon fiber felt shows excellent fluorine ion removal rate and removal efficiency on a water body containing low-concentration fluorine ions and has wide application prospects.

The invention discloses a soil conditioner and a preparation method thereof, and relates to the technical field of soil improvement. The preparation method comprises the following steps: mixing diatomite with a hydrochloric acid solution, heating and stirring for reaction, performing suction filtration, washing with deionized water until filtrate is neutral, and drying and grinding to obtain purified diatomite; dissolving magnesium chloride hexahydrate, aluminum chloride hexahydrate and urea in deionized water to form a salt-urea mixed solution, adding purified diatomite for dispersion, and carrying out hydrothermal reaction, cooling, suction filtration, hot deionized water washing and drying on the turbid liquid to obtain a layered double hydroxide-diatomite composite material; the composite material is dispersed in a Tris-HCl buffer solution, dopamine hydrochloride is added under stirring for a reaction, suction filtration, deionized water washing and drying are performed after the reaction, and the soil conditioner is obtained. The modifier prepared by the invention can efficiently fix anionic and cationic heavy metals in soil, and is good in stability.

The invention discloses a Fe-doped Bi2SeO5 nano material as well as a preparation method and application of the Fe-doped Bi2SeO5 nano material. The preparation method comprises the following steps: dissolving ferric chloride hexahydrate, bismuth nitrate pentahydrate and sodium selenite according to a specific ratio by using a hydrothermal synthesis technology and taking pure water as a solvent, and stirring at the room temperature of 25 DEG C until a system is uniform, so as to obtain a precursor mixed solution of the Fe-doped Bi2SeO5 nano material; the mixed solution is subjected to a hydrothermal reaction and then is subjected to heat treatment in an air atmosphere, and the target Fe-doped Bi2SeO5 nano material is finally obtained by regulating and controlling parameters such as a precursor ratio, a hydrothermal reaction temperature, heat preservation time and heat treatment conditions through a system. The nano material is used for catalytic degradation of antibiotics in a PMS system, and has the characteristics of strong anti-interference capability, good tolerance to acid and alkali environments, remarkable catalytic effect, high stability and the like.

This invention discloses a metal-organic framework material in which sulfonic acid and carboxylic acid groups are simultaneously coordinated with chromium ions, its preparation method, and its application. Belonging to the field of crystalline materials technology, the chemical formula is [Cr(OH)(SO3)(CO2)(C6H4)], and the ligand is p-sulfobenzoic acid. It is prepared by the following steps: p-sulfobenzoic acid and chromium chloride hexahydrate are ground and mixed to obtain a premix; the premix is ​​heated to 150-250℃ and reacted for 12-144 hours; after the reaction, the product is washed with ethanol, centrifuged, and dried to obtain the chromium-based metal-organic framework material. The obtained chromium-based metal-organic framework material exhibits excellent proton conductivity, with a conductivity reaching 8.54 × 10⁻⁶. ‑3 S·cm ‑1 (98%RH).

The invention discloses aluminum oxide-based high-dispersity grinding powder and a preparation method thereof, and relates to the technical field of aluminum oxide grinding powder. Comprising the following steps: step 1, adding aluminum chloride hexahydrate and aluminum nitrate nonahydrate into deionized water, adding a precipitator, a dispersant, ammonium fluoride and a functional additive, stirring at 85-95 DEG C for 3-4 hours, aging for 0.5-1.5 hours, washing and drying to obtain aluminum hydroxide powder; 2, grinding aluminum hydroxide powder and a sintering aid to obtain a raw material; and 3, calcining the raw materials in stages, and cooling to room temperature to obtain the high-dispersity grinding powder. The functional additive, the dispersing agent and other raw materials are combined with the sintering aid and a specific process to finally obtain the product; the system can effectively prevent carbonization of organic matters and inhibit abnormal growth of crystal grains, so that the dispersity and hardness of the product are remarkably improved while the crystal grain size of the product is controlled.

The present application belongs to the technical field of solid composite propellant recycling, and particularly relates to a method for crushing waste solid composite propellant. First, a composite precipitate of iron hydroxide and aluminum hydroxide is generated by using ferric chloride hexahydrate and aluminum chloride hexahydrate, the precipitate is filtered and washed, and then is mixed with carbon nanotubes and ethanol for ball milling, and finally is calcined to obtain a nano composite grinding aid. After the nano composite grinding aid is prepared into a suspension, the waste solid composite propellant is crushed together with the suspension, and the crushed solid composite propellant particles are separated by screening. The nano composite grinding aid prepared by the present application can improve the performance of the propellant, and the crushing method is particularly suitable for combustion recycling of the waste solid composite propellant. In the combustion recycling, the combustion efficiency and energy release are enhanced, so that the recycling heat value and energy utilization rate of the propellant can be significantly improved.

The invention provides high-purity aluminum oxide nano powder and a preparation method thereof, and belongs to the technical field of nano material preparation. The preparation method comprises the following steps: by taking aluminum sulfate octadecahydrate and aluminum chloride hexahydrate as aluminum salts and polyethylene glycol and fumaric acid as admixtures, slowly adding an aluminum salt solution into an ammonium carbonate solution to react, washing, centrifuging, filtering, drying and sieving to obtain precursor powder, adding ethanol into the precursor powder to prepare slurry, then adding behenic acid into the slurry, and carrying out ball milling to obtain a finished product. And carrying out ball milling, sieving, drying and calcining to obtain the high-purity aluminum oxide nano powder. The prepared aluminum oxide nano powder is uniform in particle size distribution and good in dispersity, the purity is larger than 99.99%, and the requirement of the high-end aluminum oxide nano powder industry can be met.

The invention relates to the technical field of hydrotalcite materials, in particular to an efficient desulfurized titanium-based hydrotalcite-like material and a preparation method thereof. The preparation method of the efficient desulfurization titanium-based hydrotalcite-like material comprises the following steps: adding zinc nitrate hexahydrate and urea into water, stirring for 10-20 minutes, dropwise adding titanium tetrachloride into the mixture, continuously stirring for 20-40 minutes, aging for 40-50 hours at 120-140 DEG C, carrying out suction filtration, washing, carrying out vacuum drying, and grinding to obtain a precursor; dissolving aluminum chloride hexahydrate and cerium chloride into water, adding the precursor, stirring for 20-40 minutes, reacting for 15-20 hours at 160-180 DEG C, cooling to room temperature, washing to be neutral, drying in vacuum, cooling to room temperature, heating to 300-400 DEG C, preserving heat for 5-10 hours, and cooling to room temperature. The problems of insufficient specific surface area and poor adsorption selectivity are effectively solved, the breakthrough sulfur capacity is high, and the adsorption performance is excellent.

This invention provides a method for preparing high-modulus modified thin bamboo veneer and laminates. The method improves the material's modulus, toughness, and bonding properties while retaining the bamboo veneer. A green and environmentally friendly eutectic solvent, a compound solution of choline chloride, glycerol, and aluminum chloride hexahydrate, is used to impregnate the ultrasonically treated bamboo veneer sheets. Under specific temperature and time conditions, some lignin in the main components is removed, and the waxy layer and SiO2 on the bamboo veneer surface react chemically with the solvent components to form new silicides, significantly increasing the modulus. The waxy layer, which affects bonding, dissolves or is removed, resulting in a viscous lamination on the surface. The porosity of the main cells in the inner layer increases, facilitating subsequent bonding or other impregnation treatments, thus enabling controllable board structure and properties. The high-strength and tough modified bamboo veneer unit prepared by this invention does not require de-greening treatment, improving bamboo utilization.

This invention discloses a molecular sieve-based composite adsorbent and its preparation method, relating to the field of wastewater treatment technology. The molecular sieve-based composite adsorbent is composed of phosphorus-modified ZSM-5 molecular sieve co-modified with iron and lanthanum, 3-aminopropyltriethoxysilane, sodium alginate, and aluminum chloride hexahydrate. The grafted and co-modified ZSM-5-based adsorbent is embedded and fixed in an aluminum alginate gel network, forming a multi-level composite adsorbent based on molecular sieves and possessing multiple active centers including metal oxides, amino groups, and a gel layer. This not only enhances the adsorption capacity for various heavy metals through abundant adsorption sites but also effectively reduces the material's sensitivity to pH changes through physical barriers and stabilizing components, maintaining good stability and adsorption performance within the pH range of 4-9.

The invention belongs to the technical field of crystals, and discloses a spodumene epoxy resin film and a preparation method and application thereof. The spodumene synergistic adhesive comprises the following raw materials in parts by mass: 1-3 parts of pretreated spodumene, 0.1-0.15 part of synergistic particles, 10-20 parts of epoxy resin AB glue and 0.1-0.15 part of a toughening agent. Wherein the pretreated spodumene is spodumene powder modified for 1-4 hours in the atmosphere of argon and hydrogen mixed gas at 200-500 DEG C; the synergistic particles are prepared from lead bromide, europium chloride hexahydrate, terbium chloride hexahydrate, 1-octadecene, zinc acetate dehydrate, 2-methylimidazole and a silane coupling agent KH-560. The introduction of the pretreated spodumene and the synergistic particles effectively improves the X-ray imaging resolution, the size stability and the luminescence uniformity of the epoxy resin film. Therefore, the method has a wider application prospect in the field of three-dimensional X-ray imaging.

The invention discloses a magnesium-aluminum hydrotalcite-based radiation cooling cotton fabric based on salt lake bischofite and a preparation method thereof, and the preparation method specifically comprises the following steps: drying natural crystal bischofite, dissolving in absolute ethyl alcohol, filtering, and evaporating to obtain bischofite; soaking the cotton fabric in a sodium hydroxide solution, heating, washing and drying; the preparation method comprises the following steps: respectively dissolving bischofite, aluminum chloride hexahydrate and urea in deionized water, mixing the obtained bischofite solution, aluminum chloride hexahydrate solution and urea solution, placing the mixture in a reaction kettle, soaking the cotton fabric in the reaction kettle for reaction, washing and drying. The magnesium-aluminum hydrotalcite-based radiation cooling cotton fabric prepared by the invention has high sunlight reflectivity, intermediate infrared emissivity and radiation cooling performance. The sunlight reflectivity of the radiation cooling cotton fabric exceeds 90%, the mid-infrared emissivity exceeds 75%, the radiation cooling temperature exceeds 5 DEG C, and thermal comfort can be provided for a human body in a hot environment under the condition that no power resource is consumed.

The application discloses a method for preparing flower-shaped biochar balls and lignin-based carbon dots from waste distiller's grains in multiple scales and application thereof. The application is based on the multiple-scale development and utilization of waste distiller's grains. Aluminum chloride hexahydrate and glycerol are used as a eutectic solvent to separate lignin from the distiller's grains, so that a mixed solution A of distiller's grains cellulose carbohydrates, lignin and the eutectic solvent is obtained. The mixed solution A is mixed with an acetone aqueous solution, and centrifugal separation is performed to obtain a mixed solution B of cellulose carbohydrates and lignin-eutectic solvent. After the acetone in the solution B is removed, a concentrated mixed solution B is obtained, and then a hydrothermal reaction is performed to obtain a lignin-based carbon dot solution. The distiller's grains cellulose carbohydrates are subjected to a hydrothermal reaction to obtain cellulose hydrothermal carbon balls. The cellulose hydrothermal carbon balls, melamine, cobalt acetate hexahydrate and potassium bicarbonate are uniformly mixed by co-grinding, and then pyrolysis is performed to obtain flower-shaped biochar ball catalysts. The waste distiller's grains are converted into the lignin-based carbon dot solution which can be applied to heavy metal ion sensing and the catalyst which can be applied to the remediation of organic pollutants in water bodies in multiple scales and high value, so that the comprehensive utilization rate of the waste distiller's grains is improved, and the application has remarkable resource and environmental values.

The invention discloses a preparation method of flame-retardant aerogel capable of catalytically purifying formaldehyde at room temperature, and the preparation method comprises the following steps: firstly, carrying out acid-alkali treatment on solid wastes in the planting industry to obtain cellulose with higher purity, and then loading manganese oxide on the cellulose to obtain the flame-retardant aerogel. Finally, sodium alginate, boric acid and aluminum chloride hexahydrate are combined to be matched with a specific aerogel preparation method to prepare the flame-retardant aerogel capable of catalytically purifying formaldehyde at room temperature. The cellulose is extracted by taking solid wastes in the planting industry as raw materials, so that the method is environment-friendly and low in cost; the manganese oxide is loaded on the cellulose, so that the problems that traditional catalyst powder is difficult to recover and dust pollution is easily caused can be solved; the prepared aerogel material has excellent flame retardance, heat resistance, heat preservation, heat insulation and room-temperature formaldehyde catalytic purification performance, and has positive practical application value.

The invention discloses a marble 3D printing consumable capable of improving strength and a preparation method. The marble 3D printing consumable capable of improving strength comprises the following components in parts by weight: PLA, marble powder, a compatilizer, a nucleating agent, a lubricant, an antioxidant, modified TPU and sodium fluosilicate. Wherein the modified TPU comprises the following components in parts by weight: TPU, sodium silicate and aluminum chloride hexahydrate. Sodium silicate and aluminum chloride hexahydrate are wrapped by TPU, and during actual printing, the TPU is melted by the temperature of a nozzle to release sodium silicate and aluminum chloride hexahydrate, and hardness is enhanced under the combined action of the TPU and water. The artificial marble has the beneficial effects that the strength can be improved while the visual effect of marble can be simulated.

The utility model relates to an aluminum mud recovery device which comprises an aluminum mud collection chamber which is sequentially connected with a reaction tank, a first settling chamber, a filter press and an aluminum chloride collection chamber, an outlet of the aluminum chloride collecting chamber is connected with an evaporator which is sequentially connected with a crystallizer and a first filter, and an outlet of the first filter is further connected with an inlet of the evaporator. The other outlet of the aluminum chloride collecting chamber is connected with a polymerization chamber, the polymerization chamber is connected with a calcium aluminate storage tank, a basicity measuring chamber and a second settling chamber through electromagnetic valves, and the second settling chamber is connected with a curing chamber through a second filter. The aluminum mud recovery device disclosed by the utility model can be used for simultaneously preparing aluminum chloride hexahydrate crystals and liquid polyaluminum chloride, and the prepared liquid polyaluminum chloride is high in purity and basicity and is suitable for being applied to a water purifying agent.

This invention relates to the field of water treatment chemicals, and is used to solve the problem that existing water treatment chemicals are unable to remove substances such as Pb from water. 2+ Cd 2+ To address the technical problem of heavy metal ion contamination, this invention provides a water pollution treatment agent and its preparation method. The preparation method includes the following steps: synthesizing MOFs using aluminum chloride hexahydrate and 2-aminoterephthalic acid; using crown ether and povidone K30 as auxiliary agents; and modifying the MOFs with tannic acid. This water pollution treatment agent can effectively adsorb and absorb heavy metal ions, reducing their content. It is suitable for various types of polluted water bodies, protecting the ecological environment. Furthermore, the method for preparing the water pollution treatment agent is simple and easy to operate.

The application discloses a preparation method of hierarchical-pore chiral MOFs for chiral drug resolution, and the method comprises the following steps: dissolving 2-amino-1,1'-biphenyl-4,4'-dicarboxylic acid in DMF to obtain an initial solution; increasing the temperature to 110-130 DEG C, adding aluminum chloride hexahydrate, and stirring for 24 h or more; after cooling, performing solid-liquid separation, washing, drying, and vacuum drying to obtain DUT-5-NH2; dissolving chiral molecules in MES buffer, adding a coupling agent to activate for 1-2 h, adding DUT-5-NH2, immediately adding acetonitrile to stop the hydrolysis process of DUT-5-NH2 after ultrasonic treatment for 1-2 min; again performing ultrasonic treatment for 1-2 min, and stirring for 5 d or more; performing solid-liquid separation, washing, and drying to obtain hierarchical-pore chiral MOFs materials; four kinds of hierarchical-pore chiral MOFs are successfully prepared by using the post-synthesis modification method, are used for selective adsorption and separation of macromolecular chiral drugs, and have good separation effects on various macromolecular chiral drugs, and therefore, the synthesis method is simple, the performance is excellent, the stability is good, the cost is low, and therefore, the method has a wide prospect in the separation of macromolecular chiral drugs.

The application discloses a trivalent chromium plating process for high-strength steel structural parts, a process and a plated layer structure, which comprises sequentially plating cobalt-titanium alloy, cyanide-free copper, bright nickel, trivalent chromium and rare earth electrolytic protection on a high-strength steel base body. The trivalent chromium plating process composition and parameters comprise 90-130 g / L of chromium chloride hexahydrate, 80-120 g / L of potassium chloride, 100-150 g / L of ammonium chloride, 18-24 g / L of ammonium bromide, 45-50 g / L of ammonium formate, 50-60 g / L of boric acid, 8-12 mL / L of rare earth additive, 2-4 mL / L of trivalent chromium plating walking position agent, 1-3 mL / L of accelerator, 2.5-3.2 of plating solution pH value, 25-35 DEG C of plating bath temperature, 10-16 A / dm of cathode current density and moderate air agitation. 2 The hydrogen brittleness test is carried out according to HB 5067.1-2005 'Plating Process Hydrogen Brittleness Test Part 1: Mechanical Method', and the test result meets the standard requirement. The plated layer has excellent performance and good market prospect.

The application discloses a trivalent chromium plating process, which comprises the following process parameters: chromium chloride hexahydrate 80-140 g / L, potassium chloride 90-160 g / L, ammonium chloride 90-160 g / L, ammonium bromide 16-30 g / L, ammonium formate 40-60 g / L, boric acid 45-65 g / L, rare earth additive 8-12 mL / L, walking agent 2-4 mL / L, accelerator 1-3 mL / L, plating solution pH value 2.5-3.2, plating bath temperature 25-35 DEG C, cathode current density 10-18 A / dm 2 2, inert anode is adopted, and moderate air stirring is adopted. The rare earth additive comprises lanthanum chloride heptahydrate 40-140 g / L and praseodymium chloride heptahydrate 0-130 g / L. The steel base is subjected to cyanide-free copper plating + bright nickel plating + trivalent chromium plating + rare earth electrolytic protection, neutral salt spray test is carried out according to GB / T 10125-2021 'Salt Spray Test of Artificial Atmosphere Corrosion Test', and the prepared sample surface is free of corrosion product generation. The technical scheme obviously improves the corrosion resistance of the trivalent chromium plating layer, and has a good market prospect.

The invention belongs to the technical field of aerogel materials in colloidal chemistry, and particularly relates to an aerogel-based composite heat dissipation coating and a preparation method thereof. The preparation method comprises the following steps: S1, preparing silica sol by using sodium metasilicate and hydrochloric acid as raw materials, preparing aluminum oxide sol by using aluminum chloride hexahydrate, deionized water and absolute ethyl alcohol as raw materials, then mixing the silica sol, the aluminum oxide sol, a carbon nanocage and epoxypropane, and then performing supercritical drying treatment to obtain a carbon nanocage catalyst; a composite aerogel base material is obtained; and S2, preparing silver-containing graphene from graphene nanosheets and silver nitrate as raw materials, compounding the silver-containing graphene with carbon nanotubes to obtain a high-thermal-conductivity filler, mixing the high-thermal-conductivity filler with a binder to obtain coating slurry, coating the surface of a composite aerogel base material with the coating slurry, and carrying out heat treatment and vacuum drying to obtain the aerogel-based composite heat dissipation coating. According to the invention, light weight and high heat conductivity are realized, and the mechanical properties of the material are effectively improved.

The invention discloses a preparation method of a core-shell type MOF / COF / MOF composite nano-enzyme, the composite nano-enzyme and application of the composite nano-enzyme. CuMOF nano-particles are synthesized through a solvothermal method and serve as an inner core MOF of a three-layer MOF / COF / MOF material and a catalytic activity core of a bimetallic nano-enzyme; the preparation method comprises the following steps: by taking CuMOF as a template and selecting DHBDC and TAPB as monomers, constructing a COF layer through Schiff base condensation reaction; cuMOF / COF is used as a carrier, europium chloride hexahydrate is used as a metal source, isophthalic acid is used as an organic ligand, EuMOF is grown on the surface of the carrier in situ through a solvothermal method, the core-shell MOF / COF / MOF composite nano-enzyme with CuMOF as a core, COF as a middle layer and EuMOF as an outer layer is prepared, the structure is regular, functions are complementary, interface and pore channel layers can be increased, the structural stability can be enhanced, more catalysis and adsorption sites are provided, and the preparation process is simple and convenient. And multifunctional coupling is realized.