750 results about "Carbon quantum dots" patented technology

The invention discloses a metal-doped carbon quantum dot as well as preparation and application of the metal-doped carbon quantum dot in a nano antibacterial agent, citric acid, urea and tea polyphenol are taken as precursors, metal salt is added, carbon dot synthesis and metal ion doping are synchronously completed in one step through a hydrothermal method, and the metal-doped carbon quantum dot is prepared; the surfaces of the metal-doped carbon quantum dots are negatively charged, and the metal-doped carbon quantum dots have peroxidase-like activity and catalase-like activity at the same time; the metal ions adopt any one of Fe < 3 + >, Cu < 2 + > and Ce < 3 + >; the metal-doped carbon quantum dots are in a sphere-like shape. The metal-doped carbon quantum dots prepared by the preparation method disclosed by the invention have peroxidase-like activity and catalase-like activity at the same time through precise doping of metal ions, and the two activities have a synergistic effect in an oral periodontitis microenvironment, so that a good antibacterial effect is achieved.

The invention relates to a carbon quantum dot for strengthening and promoting growth of microalgae and application thereof. In the process of preparing the carbon quantum dots by a conventional hydrothermal method, a precursor mixture is subjected to acidification modification in advance, the pH value is adjusted to 2 by using nitric acid, and then a hydrothermal reaction is performed, so that the prepared carbon quantum dots have the capability of promoting the growth of microalgae. However, if other acids are adopted or pH adjustment is not in place, the effect cannot be achieved, and even the inhibition effect can be achieved. The obtained product is good in effect and stable in performance, no special reaction device needs to be additionally arranged in the acidification modification process, and the method has the advantages that operation is easy and convenient, raw materials are easy to obtain, and the process can be quantified; the method is simple and convenient in process operation, has universality and is easy for industrial production.

The invention discloses an MOF-CQD enzyme-sensitive FRET hydrogel diagnosis and treatment probe as well as a preparation method and application thereof, and belongs to the technical field of biomedical detection and treatment. The probe takes a carboxyl carbon quantum dot (CQD) as a donor and a metal organic framework (MOF) as an acceptor, and the donor and the acceptor are connected through a replaceable enzyme response polypeptide bridge; when the fluorescence is complete, FRET is generated to quench the CQD fluorescence, the FRET is interrupted after the target enzyme cuts off the peptide bridge, and the blue / red fluorescence ratio is changed to realize nanomole-level quantitative detection and has self-correction capability. The probe is packaged in a four-arm PEG transparent hydrogel which does not need a photoinitiator and can be quickly self-crosslinked, and can be prepared into a film, a tooth socket and the like for POCT (point-of-care testing) of parts such as an oral cavity / skin and the like. After detection, the MOF is activated by illumination of 630-660 nm to generate active singlet oxygen, so that local antibacterial or anti-tumor treatment is realized, and a diagnosis and treatment integrated scheme is constructed.

The invention discloses a silk protein-MXene composite film and a preparation method thereof. The silk protein-MXene composite film sequentially comprises a conductive surface layer, a porous response layer and a supporting bottom layer from top to bottom, the invention relates to the technical field of composite films. According to the fibroin-MXene composite film and the preparation method thereof, a three-layer gradient structure is formed by the conductive surface layer, the porous response layer and the supporting bottom layer, good conductivity and electromagnetic shielding effectiveness are ensured by utilizing oriented arrangement of MXene of the conductive surface layer, gallic acid and MXene form a hydrogen bond network, and nitrogen-doped carbon quantum dots coat the surface of MXene to form a physical barrier, so that the electromagnetic shielding effect is improved, and the electromagnetic shielding effect is improved. Through double oxidation resistance of gallic acid and nitrogen-doped carbon quantum dots, a sponge body structure formed by the porous response layer is matched to endow the composite film with high-sensitivity response to external stimulation, the supporting bottom layer is crosslinked by hexamethylene diisocyanate and enhanced by nanocellulose, the tensile strength is improved, and the tensile strength of the composite film is improved. And the contradiction between the mechanical property and the conductivity of the traditional composite film is effectively solved.

The invention discloses a functionalized carbon quantum dot modified all-vanadium redox flow battery electrolyte. The functionalized carbon quantum dot has a large specific surface area and a carboxyl functional group on the surface; the electrolyte of the flow battery is a dilute sulfuric acid solution of vanadium; the main evaluation indexes of the electrochemical performance are the cycle efficiency, the capacity retention ratio and the battery performance of the electrolyte; the invention aims to discuss the catalytic action of the surface functional groups of the functionalized carbon quantum dots on the oxidation-reduction reaction of vanadium ions in the electrolyte of the all-vanadium redox flow battery by using the functionalized carbon quantum dots as an additive of the electrolyte. Meanwhile, the influence of the concentration and doping of the carbon quantum dots on the electrochemical performance of the electrolyte of the all-vanadium redox flow battery is researched, so that the working efficiency and the overall performance of the battery are improved, the characteristics of the electrolyte are improved, and the energy consumption of the battery is reduced.

The invention relates to the technical field of electrode paste, in particular to a preparation method of high-pressure-resistant high-strength graphite enhanced electrode paste, which comprises the following steps: sequentially performing oxidation modification and silane modification on crystalline flake graphite powder, preparing silane modified graphite powder, and synchronously preparing a boron-nitrogen source precursor; coating the aminated carbon quantum dots with silicon to obtain silicon-coated carbon quantum dots; preparing a composite adhesive, a tungsten carbide-aluminum nitride composite reinforced phase and carbon-plated silicon powder; the preparation method comprises the following steps: blending and kneading silane modified graphite powder, a boron-nitrogen source precursor and other components, and pressing under gradient pressure to obtain a green body; and performing segmented roasting on the green body, and cooling to obtain the target electrode paste. According to the invention, crystalline flake graphite oxidation-silane modification is adopted to optimize interfacial compatibility, silicon-coated carbon quantum dots are adopted to reinforce a bonding system, a composite reinforcement phase is adopted to construct a mechanical support network, boron-nitrogen source in-situ doping supplemental reinforcement is adopted, and gradient pressure pressing and segmented roasting are combined to ensure that the structure is compact. The normal-temperature compressive strength, high-temperature mechanical stability and compactness of the electrode paste are improved through the synergistic effect of all links, and the electrode paste can stably adapt to the high-temperature and high-load working conditions.

The invention provides an oil field productivity monitoring method using a carbon quantum dot tracer agent, and the method comprises the steps: S100, obtaining the convection term and diffusion term characteristics of an oil field through the injection of the carbon quantum dot tracer agent and an inert tracer agent, and building an oil field monitoring characteristic set; step S200, selecting main characteristics of oil field monitoring from the oil field monitoring characteristic set by using a Spearman correlation coefficient and a random forest tree model method; and S300, inputting the main features into a neural network to monitor the productivity of the oil field, wherein the neural network is a particle swarm optimization-back propagation neural network for Wiener process optimization.

The invention belongs to the field of carbon nanomaterials, and provides a method for preparing a carbon quantum dot material doped with elements such as silicon and aluminum by oxidative depolymerization and stripping of coal gangue. Comprising the steps of screening and matching of coal gangue, oxidative depolymerization stripping, centrifugal dialysis membrane filtration and modification, drying and the like, raw materials and all the steps are specifically set, and the particle size or fluorescence performance of fluorescent carbon dots can be specifically selected and set according to selective oxidative depolymerization stripping conditions. The main particle size of the prepared multi-inorganic-element doped carbon quantum dot material is kept within the range of 1.5-2.0 nm, the structure is stable, the optical performance also meets the requirements, and the material can be further modified and is expected to be applied to the fields of photovoltaic equipment, biological imaging, photocatalytic degradation of organic pollutants or sensing and the like.

The application discloses a cross-linked ETFE composite film with gradient ultraviolet shielding function and a preparation method and application thereof, and belongs to the technical field of ETFE film preparation. The cross-linked ETFE composite film is composed of three layers of a surface layer, a middle layer and a bottom layer. The surface layer material comprises ETFE resin and fluorinated carbon quantum dots; the middle layer material comprises ETFE resin, allyl-containing comonomer A and phenyl-containing comonomer B; and the bottom layer material comprises ETFE resin and CeO2 nanowires. The fluorinated carbon quantum dots have a particle size of 3-5 nm and contain a -C4F9 structure. The comonomer A is an allyl-containing fluorine olefin monomer, and the comonomer B is a phenyl-containing organic fluorinated compound. Through the synergistic effect of the surface layer self-migration fluorinated carbon quantum dots, the middle layer copolymerization modification and the bottom layer CeO2 nanowires, high light transmittance, full-waveband ultraviolet shielding and long-term weather resistance are achieved.

The invention discloses a carbon quantum dot / metal organic framework composite material as well as a preparation method and application thereof, and the method is characterized in that carbon quantum dots derived from waterborne polyurethane are embedded into a zeolite imidazate framework 8 to prepare the carbon quantum dot / metal organic framework composite material. The composite material can be used as a ratio type fluorescent probe for trace detection of tetracycline, a dual-emission fluorescence signal of the probe is derived from tetracycline which quenches blue fluorescence of puCDs at 450 nm through an inner filter effect, and the coordination effect between Zn < 2 + > and tetracycline triggers an aggregation-induced emission effect, so that new fluorescence emission is generated, and the detection sensitivity is improved. The intensity of the two signals changes in proportion to the concentration of tetracycline, the wide linear concentration detection range and the low detection limit are achieved, the probe has the high recovery rate and the large adsorption capacity in detection, the problems that a traditional detection method is insufficient in sensitivity, poor in anti-interference capacity, high in cost and the like are solved, and the application prospect is wide. A new thought is provided for constructing a ratio type fluorescent probe with a removal function.

The invention relates to the technical field of functional board manufacturing, in particular to a damp-proof and wear-resistant composite board and a laminating process thereof. The composite material is prepared from 40-50 parts of dithiocar-bamate modified epoxy resin, 30-40 parts of nano silicon dioxide-carbon quantum dot modified polyurethane, 5-8 parts of a graphene-silane-metal organic framework compound, 2-4 parts of magnetic field oriented silicon carbide whiskers and 1-3 parts of self-repairing microcapsules. The modified epoxy resin is prepared from epoxy chloropropane and mercapto silane through a reaction, the graphene compound is embedded into the ZIF-8 nanoparticles, and the silicon carbide whiskers are directionally arranged through a 0.5-1T magnetic field during lamination; the plate is of a three-layer structure, covalent bonds are formed among layers through a silane coupling agent, and the plate has moisture-proof, wear-resistant and self-repairing functions. The composite material is low in water absorption rate, high in wear resistance frequency, high in microcrack repairing efficiency, high in interlayer bonding strength, capable of being stably used in high and low temperature environments, efficient in preparation process and suitable for the fields of high-end buildings, electronic equipment and the like, and the moisture-proof grade reaches IP67.

The invention relates to the technical field of agricultural application of nano materials, and discloses a preparation method and application of a photosynthetic accelerant containing carbon quantum dots. Urea and citric acid are adopted as raw materials, and the nitrogen-carbon molar ratio and hydrothermal reaction parameters are optimized, so that efficient doping of nitrogen and accurate regulation and control of the particle size are achieved, and the photosynthetic accelerant containing the carbon quantum dots is obtained. The nitrogen-doped carbon quantum dot photosynthetic promoter with excellent upconversion performance is successfully synthesized, the promoter has good water solubility and biocompatibility, the photosynthetic efficiency of plants can be greatly improved within the concentration range of 0-100 mg / L, a safe application window is defined, and by establishing foliage spraying and water planting dual-mode application specifications, the application range of the nitrogen-doped carbon quantum dot photosynthetic promoter is widened, and the application range of the nitrogen-doped carbon quantum dot photosynthetic promoter is widened. The problems that current crops are insufficient in solar spectrum utilization and low in light energy conversion efficiency are solved in a targeted manner by utilizing an ultraviolet light-photosynthetically active radiation conversion function mediated by the carbon quantum dots and combining the targeted enrichment permeation characteristic of the carbon quantum dots in chloroplast.

The invention discloses preparation of a phosphate radical modified carbon quantum dot nickel-based catalyst and application of the phosphate radical modified carbon quantum dot nickel-based catalyst in alkaline seawater electrolysis, and belongs to the technical field of hydrogen production through electro-catalysis and seawater electrolysis. The preparation method of the phosphate radical modified carbon quantum dot nickel-based catalyst comprises the following steps: mixing citric acid and urea in water to obtain a carbon quantum dot precursor solution; and mixing the carbon quantum dot precursor solution, phytic acid and a nickel substrate, and reacting to obtain the phosphate radical modified carbon quantum dot nickel-based catalyst. The phosphate radical modified carbon quantum dot nickel-based catalyst is designed by introducing a composite modification layer of carbon quantum dots and phosphate radicals on the surface of a nickel substrate, and the phosphate radical modified carbon quantum dot nickel-based catalyst has an obvious promotion effect on the OER activity through the synergistic effect of PO4 groups and CDs in the phosphate radical modified carbon quantum dot nickel-based catalyst; therefore, the catalyst can show excellent oxygen evolution reaction activity and long-term stability in alkaline seawater containing Br <-> and Cl <->.

The invention relates to the field of manufacturing of multi-color sheath glass, in particular to glass and a preparation method of a multi-color sheath of the glass. The glass base layer comprises glass, a multicolor sheath layer and a surface self-cleaning layer. The surface self-cleaning layer of the glass has a novel composite structure of a nanocrystalline multicolor sheath layer and a quantum dot sensitized self-cleaning layer. The structure effectively solves the problem of color covering of a traditional thick coating. In addition, through cooperative modification of the carbon quantum dots and the graphene quantum dots, the photoresponse range of titanium dioxide is expanded from ultraviolet light to visible light, so that the photocatalytic efficiency of the titanium dioxide is remarkably improved.

The invention discloses an anti-ultraviolet, antibacterial, antioxidant and high-light-transmittance food packaging film, and belongs to the field of food packaging materials, and the anti-ultraviolet, antibacterial, antioxidant and high-light-transmittance food packaging film comprises 40-60 parts of a chitosan solution; 40-60 parts of a gelatin solution; 0.01 to 0.2 part of nitrogen-doped carbon quantum dots; 0.001 to 0.02 part of an antibacterial agent; the invention further discloses a preparation method of the food packaging film. The preparation method comprises the following steps: S1, preparing a chitosan solution; s2, preparing a gelatin solution; s3, preparing nitrogen-doped carbon quantum dots; s4, the chitosan solution, the gelatin solution, the nitrogen-doped carbon quantum dots and the antibacterial agent are mixed and dried, and the multifunctional food packaging film is prepared. Generally speaking, the transparency of the food packaging film is greatly reduced while the ultraviolet barrier property of the food packaging film is improved. The nitrogen-doped carbon quantum dot disclosed by the invention has excellent absorption performance on ultraviolet light in a range of 200-400nm, almost has no absorption on visible light of 400nm or above, and has excellent oxidation resistance. The food packaging film prepared by the invention not only has excellent ultraviolet blocking capability and high visible light transmittance, but also has remarkable antibacterial and antioxidant characteristics, and shows an excellent fresh-keeping effect on strawberries and fresh-cut apples.

The invention discloses a self-repairing composite floor for a clean room and a preparation method of the self-repairing composite floor, and the preparation method comprises the following steps: carrying out amination treatment on nano silicon dioxide and carbon quantum dots by using a silane coupling agent, and sulfonating polyethersulfone ketone by using concentrated sulfuric acid; the preparation method comprises the following steps: carrying out curing treatment on epoxy resin, an amine curing agent, N-hydroxyethyl maleimide and tetrakis (3-mercaptopropionic acid) pentaerythritol ester to obtain epoxy-mercaptan resin; the preparation method comprises the following steps: carrying out prepolymerization reaction on vacuum dehydrated polyester polyol, tetrahydroxyethyl ethylenediamine, furanpropanol, diisocyanate, a catalyst, 2, 2 '-thiodiethanol and hydroxyl silicone oil to obtain a star-shaped polyurethane prepolymer, adding epoxy-thiol resin, glyceryl borate, sulfonated polyethersulfone ketone, aminated silicon dioxide, aminated carbon quantum dots and an auxiliary agent, carrying out ultrasonic treatment, and carrying out drying to obtain the star-shaped polyurethane resin. The self-repairing coating material is obtained; and coating the self-repairing coating material on the surface of a base plate, and performing hot-pressing curing molding to obtain the self-repairing composite floor for the clean room.

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

The invention discloses a self-repairing material for electronic device packaging and a preparation method and a packaging method thereof, and belongs to the technical field of electronic device packaging. The self-repairing material comprises the following components: a dynamic reversible chemical bond network formed by a DA bond prepolymer and a hydrogen bond donor in a synergistic manner, boron nitride nanosheets and carbon quantum dots, adding boron nitride nanosheets and carbon quantum dots into the DA bond prepolymer, and fully dispersing; then adding a hydrogen bond donor, and fully stirring to obtain a self-repairing material; spraying a self-repairing material on the surface of the substrate to form a thick packaging layer, curing to form a three-dimensional interpenetrating network structure, and packaging the electronic device; according to the invention, the packaging layer has a rapid self-repairing capability and supports efficient repair; the material has high thermal conductivity, mechanical strength and thermal expansion matching with an LED chip; the self-repairing process does not need high temperature or complex equipment, and is compatible with the existing packaging production line.

The invention belongs to the technical field of nano functional materials and intelligent textiles, and particularly discloses a preparation method and application of high-brightness nitrogen-doped carbon quantum dots based on phycocyanin. The method is used for solving the problems of large difference and poor reproducibility when the same biomass in different batches is used for preparing the carbon dots in the prior art. Comprising the following steps: (1) freeze-drying spirulina, and grinding into powder to obtain spirulina powder; (2) extracting phycocyanin by utilizing spirulina powder; (3) phycocyanin is added into the reaction container, then distilled water is added, the adding amount ratio of phycocyanin to distilled water is 1 g: 33.3-50 mL, and full stirring is conducted; and then, carrying out carbonization treatment, cooling to room temperature, collecting the solution, and dialyzing for 24 hours, so that the solution outside a dialysis bag is a purified carbon quantum dot solution. According to the method, the phycocyanin is used as a single nitrogen source for the first time, the reproducibility of preparing the carbon dots from the same biomass in different batches is good, and large-scale production is facilitated.

The invention provides a formaldehyde-removing hot-melt composite elastic material and bedding using the same. The material comprises 60-80 parts of a polymer matrix, 15-25 parts of a formaldehyde catalytic decomposition agent, 5-10 parts of a polarity regulator and 0.5-2 parts of a processing aid, and is formed in one step through melt blending-hot pressing foaming. A polymer matrix is in an island phase state constructed by thermoplastic polyurethane and an ethylene-vinyl acetate copolymer through melt blending, the Shore hardness of 80A-95A and the glass transition temperature smaller than or equal to 30 DEG C are both considered, and low-temperature high resilience is achieved. The catalytic decomposition agent is compounded by MIL-101 (Cr)-NH2 and aminated carbon quantum dots according to a ratio of (3-5): 1, and formaldehyde is continuously oxidized into CO2 and H2O at normal temperature without light. The silane-modified tourmaline is used as a polarity regulator, and particle agglomeration is inhibited and an interface polarization electric field is enhanced through epoxy group covalent bonding. The density of the obtained material is 40-60 kg / m < 3 >, the aperture ratio is larger than or equal to 80%, the air permeability is larger than or equal to 500 L / (m < 2 >. S), and the material is applied to comfortable layers of mattresses, pillows or back cushions and keeps efficient formaldehyde removal and mechanical supporting functions for a long time.

The invention discloses a high-flame-retardant bio-based aerogel material and a preparation method thereof, and belongs to the technical field of flame-retardant bio-based aerogel. The high-flame-retardant bio-based aerogel material prepared by the preparation method disclosed by the invention is prepared from the following raw material components in parts by mass: 10 parts of a bio-based flame-retardant filler with a porous structure, 40 to 50 parts of a hydrophobic siloxane monomer, 12.4 to 12.6 parts of an ammonium phytate solution, 6.2 to 6.3 parts of guanosine, 31.1 to 31.4 parts of cellulose nanofibers and 0.01 to 0.02 part of benzaldehyde-polyethylene glycol-silane, the preparation method comprises the following steps: firstly, carrying out hydrolytic polycondensation on a bio-based flame-retardant filler with a porous structure and a hydrophobic siloxane monomer to form a siloxane polymer network with the bio-based flame-retardant filler as a branching center; then adding cellulose nanofibers, guanosine and an ammonium phytate solution, and performing freeze casting-freeze drying-heating post-treatment to obtain the composite material. Wherein the bio-based flame-retardant filler is obtained by compounding a porous cuttlefish ink carbon quantum dot composite material with phytic acid siloxane and trimethoxy (3-(4-nitrophenoxy) propyl) silane.

The invention provides a natural dye lake pigment and a preparation method thereof, and belongs to the technical field of pigments. Soluble silicon-doped carbon quantum dots are introduced into a natural dye solution to serve as a precipitator, the aggregation state of the natural dye is changed, and the lake pigment is obtained through mixing treatment. The prepared natural dye lake pigment is simple in preparation method and mild in preparation condition, the prepared pigment greatly overcomes the defects that natural dye is prone to discoloration and unstable, the oxygen heat resistance of the pigment is improved, the color stability is good, the lake pigment only comprises five elements of C, H, O, N and Si, the ecological pollution-free characteristic is achieved, and the application prospect is wide.

The invention relates to the technical field of microfluidics, in particular to a carbon quantum dot hydrothermal synthesis system and method based on microfluidics thermal field equilibrium, which comprises a thermal field sensing module, an equilibrium analysis module, a thermal field coupling module, an equilibrium regulation and control module and a closed loop execution module, the thermal field sensing module is used for collecting array temperature on the surface of the micro-fluidic chip and fluid pressure data in a flow channel, and reconstructing three-dimensional temperature distribution in the micro-channel through a multi-physics field coupling algorithm to obtain a real-time thermal field state matrix. According to the invention, by constructing a multi-physical field coupling algorithm of a thermocouple array-flow resistance model-conjugate heat transfer equation, the three-dimensional temperature distribution of the fluid in the micro-channel can be inverted and reconstructed by using surface temperature and pressure data, so that a control system can pass through a chip matrix, and the temperature of the fluid in the micro-channel can be controlled. The radial temperature gradient and the axial thermal distortion in the fluid are directly sensed, the hysteresis and the error of sensor measurement are eliminated, and a real physical basis is provided for accurate temperature control.

A sunscreen formulation includes carbon quantum dots having reacted units of citric acid and thiamine and particles of a metal-organic framework including zinc and reacted units of terephthalic acid. The sunscreen formulation further comprises a liquid carrier and a stabilizer. The quantum dots are dispersed in the metal-organic framework. The particles of the metal-organic framework are dispersed in the liquid carrier.

The invention relates to the technical field of biomedical materials, in particular to a preparation method of TPP-mediated mitochondrial-targeted cerium-doped antioxidant carbon quantum dots, which comprises the following steps: mixing citric acid, urea and cerium salt serving as raw materials, and reacting by adopting a hydrothermal method to synthesize the cerium-doped carbon quantum dots; then triphenylphosphine is grafted to the surface of the cerium-doped carbon quantum dot through an amide method, separation and purification are carried out after the reaction is completed, the target carbon quantum dot is obtained, and the cerium element in the cerium salt is used for endowing the carbon quantum dot with an anti-oxidation function. The carbon quantum dots prepared by the method are accurate in mitochondria targeting and strong in oxidation resistance, the preparation process is simple, convenient, environment-friendly and large-scale, and the product is uniform in particle size, stable in fluorescence, good in biocompatibility and wide in application prospect in the field of biomedicine.

The invention provides a preparation method and application of a matcha-based carbon quantum dot green corrosion inhibitor. The novel environment-friendly carbon quantum dot is successfully synthesized by taking matcha powder and polyethyleneimine as precursors and adopting a hydrothermal method, and low-dose and high-effect carbon steel anti-corrosion protection can be remarkably realized by introducing a nitrogen-containing functional group (such as amino) on the surface of a matcha molecule containing hydroxyl and carboxyl. The matcha-based carbon quantum dot is used for a carbon steel corrosion inhibitor, self-corrosion of carbon steel in an acid medium can be inhibited, the corrosion resistance is improved, the higher requirement of the green chemistry concept on corrosion inhibitor development is met, and the problem that an existing carbon quantum dot corrosion inhibitor is not ideal in corrosion inhibition performance is solved.

The invention discloses a carbon quantum dot-polyvinyl alcohol composite film and a preparation method thereof, and belongs to the technical field of food packaging fresh-keeping materials. The composite film is prepared by taking apocynum venetum carbon quantum dots and polyvinyl alcohol as raw materials under the action of a plasticizer, wherein the apocynum venetum carbon quantum dots are prepared from apocynum venetum fiber powder, dithiosalicylic acid and urea through a hydrothermal method. The composite film provided by the invention has excellent ultraviolet shielding, pH-responsive fluorescence discoloration, antibacterial and antioxidant properties, and can realize visual monitoring of the freshness of high-protein food. The preparation method disclosed by the invention is simple in process, environment-friendly, suitable for the field of food active packaging and wide in application prospect.

The invention relates to the technical field of biomedical materials, in particular to an alendronate-modified ZIF-8 encapsulated TPP-carbon dot bone targeting nano-material and a preparation method and application thereof.The alendronate-modified ZIF-8 serves as a carrier, TPP-modified carbon dots are encapsulated in the carrier, citric acid, urea and cerium salt serve as raw materials of the TPP-modified carbon dots, and the alendronate-modified ZIF-8 encapsulated TPP-carbon dot bone targeting nano-material is prepared through a one-step method. After cerium-doped carbon quantum dots are synthesized through a hydrothermal method, TPP is grafted through an amide method, alendronate endows the material with a bone targeting function, and TPP modified carbon dots endow the material with antioxidant and mitochondrial targeting functions. According to the invention, the bone targeting property is excellent, and bone focuses are efficiently enriched; the anti-oxidation and anti-inflammatory capacities are high, and the infected microenvironment can be improved; zIF-8 packaging is stable, and functional components can be controllably released; multiple components cooperate to promote bone repair, accumulation of non-target organs is little, and the composition is safe, reliable and suitable for treatment of various bone-related diseases.

A method for preparing a composite nanofiltration membrane based on aspartic acid modified carbon quantum dots belongs to the field of nanofiltration membrane preparation, and comprises the following steps: 1) dissolving citric acid monohydrate in water, adding aspartic acid, heating and stirring, and then adding a sodium hydroxide solution to adjust pH; (2) carrying out suction filtration on the mixed solution obtained in the step (1) by using a microfiltration membrane, dialyzing and purifying in ultrapure water, and freeze-drying to obtain the aspartic acid modified carbon quantum dots; (3) fixing a polysulfone base membrane in a mold, preparing a water-phase solution containing anhydrous piperazine and aspartic acid modified carbon quantum dots, pouring the water-phase solution into the mold to be in contact with the base membrane, and air-drying; and 4) preparing a trimesoyl chloride solution by using n-hexane as a solvent, pouring the trimesoyl chloride solution into a mold for contact, and finally drying to obtain the composite nanofiltration membrane.When the concentration of the aspartic acid modified carbon quantum dots is 2000ppm, the water flux reaches 168LMH, the retention rate reaches a peak value when the concentration of the quantum dots is 1000ppm and is 1.3 times of that of a base membrane, and the composite nanofiltration membrane shows excellent performance.

The invention discloses a short-Fe-C-bond Fe-based catalyst for catalyzing CO2 hydrogenation, a preparation method of the short-Fe-C-bond Fe-based catalyst and application of the short-Fe-C-bond Fe-based catalyst in preparation of C2 < + > high-added-value products, and belongs to the technical field of CO2 capture, utilization and storage. The catalyst is a carbon quantum dot doped Fe-based catalyst, and is prepared by the following steps: dissolving carbon quantum dots CQDs in an ethanol aqueous solution to obtain a CQDs dispersion liquid; and then adding cubic Fe2O3 nanoparticles, stirring for reaction, and drying to obtain the Fe-based catalyst with the short Fe-C bond. The short Fe-C bond Fe-based catalyst is simple to prepare and low in cost, can realize high-selectivity synthesis of C2 + products through one-step catalytic hydrogenation of CO2, and effectively reduces the selectivity of main C1 by-products CO and CH4. The invention develops a new regulation and control strategy for the electronic structure of the Fe-based catalyst for the CO2 hydrogenation catalytic reaction, provides a new thought for reasonably designing the catalyst with a directional synthesis function, and has a good application prospect in the field of CO2 capture, utilization and storage.