1214 results about "Heteroatom" patented technology

The invention discloses a modified organic silicon resin, a high-temperature-resistant coating and a preparation method thereof, the modified organic silicon resin is prepared by hydrolyzing at least two different siloxane monomers and then carrying out condensation reaction on the hydrolyzed siloxane monomers and at least one boric acid monomer, and the main chain of the organic silicon resin is of a heteroatom doped structure formed by a Si-O bond, a B-O bond and a B-O-Si bond; at 200-250 DEG C, the modified organic-inorganic high-temperature-resistant composite material is subjected to a self-crosslinking reaction. The high-temperature-resistant coating overcomes the defect that the high-temperature-resistant coating in the prior art cannot meet the high-temperature test, and avoids the defects that organic and inorganic high-temperature-resistant coatings crack, the impact resistance and hardness are not matched, the water resistance is poor, and the wear resistance is poor.

The invention provides a composite pollution repairing agent as well as a preparation method and application thereof, and belongs to the technical field of environmental functional materials. The composite pollution repairing agent comprises biochar, nano zero-valent iron (nZVI) loaded on the biochar, cyclodextrin and heteroatoms, and at least part of the nZVI is wrapped in the cyclodextrin. According to the prepared composite pollution repairing agent, solid waste resource utilization can be effectively achieved, the removal rate of micro-plastics reaches 90% or above, and the removal rate of heavy metal is 100%. The composite pollution repairing agent has excellent performance and good application prospect, provides a feasible solution for micro-plastic and heavy metal composite pollution treatment, and shows remarkable practical application value.

The invention relates to the technical field of batteries, in particular to a negative electrode material, a preparation method thereof and a battery. The negative electrode material comprises a silicon nano material; the metal silicide layer at least partially coats the surface of the silicon nano material; the nitrogen and sulfur doped carbon layer at least partially coats the surface of the metal silicide; and the thickness of the metal silicide layer is greater than that of the nitrogen and sulfur doped carbon layer. According to the negative electrode material, the preparation method thereof and the battery provided by the invention, the coating structure of the negative electrode material is optimized, and the metal silicide / heteroatom doped carbon double-layer coated silicon nano material can be prepared by adopting a synthesis method which is low in energy consumption and capable of constructing a functional multi-layer coating structure, so that the long cycle life and the high-rate fast charging performance can be considered at the same time.

The invention relates to a sodium ion battery hard carbon material preparation method, which comprises: (S1) uniformly mixing an asphalt substance and a heteroatom-rich organic matter to obtain a mixed precursor I; (S2) carrying out heat treatment on the mixed precursor in an oxidizing atmosphere, cooling, and wrapping the heteroatom-rich organic matter in the asphalt melting process to obtain a mixed precursor II; and (S3) calcining, cooling, grinding, washing and drying the mixed precursor II in an inert atmosphere or a hydrocarbon atmosphere to obtain the amorphous sodium ion battery negative electrode material. The negative electrode material obtained by the preparation method disclosed by the invention has high capacity and high energy density, a carbon material which is low in cost, simple in preparation process, adjustable in disorder degree, high in carbon yield and suitable for large-scale production is provided, and the carbon material is applied to the sodium ion secondary battery as the negative electrode material.

The invention discloses an acid liquid system based on synergistic interaction of a corrosion inhibitor and an iron stabilizer and a preparation method, and relates to the technical field of oilfield chemistry, the acid liquid system comprises the following components by mass: 10%-20% of an acid liquid, 0.5%-3% of a composite corrosion inhibitor, 0.5%-2% of an iron stabilizer, 0.1%-0.5% of a discharge aiding agent, 0.2%-0.8% of an acid thickening agent, and the balance of water; the main component of the composite corrosion inhibitor in the acid liquid system is long-chain alkyl bis-imidazoline-thiadiazole amide hydroxypropyl sulfobetaine, and the composite corrosion inhibitor contains a bis-imidazoline ring and a thiadiazole amide ring, and can form more stable multi-active-site adsorption on the metal surface to form a compact and stable protective film, so that the metal surface corrosion resistance is improved, and the metal surface corrosion resistance is improved. Long carbon chains in molecules can effectively block corrosive media, N, O and S heteroatoms in the molecules are adsorbed on the iron surface through lone pair electrons to inhibit corrosion, the slow-release effect is further enhanced, and therefore the slow-release efficiency is improved by 40% or above.

The invention belongs to the technical field of organic electroluminescent materials, and provides an iridium-containing heterocyclic phosphorescent doping material and an organic electroluminescent device.The doping material has a compound general formula shown in the formula I. Quinoline and a naphthalene ring are connected through silane or germane, and a silicon or germanium six-membered heterocyclic structure is formed. And reacting with iridium metal and a diketone monomer to obtain the iridium metal heterocyclic phosphorescent organic light-emitting material. The heteroatom silicon or germanium in the material can adjust molecular orbital HOMO and LUMO energy levels, and the polarity effect of heteroatoms promotes electron migration, reduces interface potential barriers and electron injection barriers, reduces carrier injection loss and improves carrier mobility, so that driving voltage is reduced, and the external quantum efficiency of a device is improved. In addition, the silicon or germanium heterocyclic ring has better rigidity, so that the overall stability of the structure is enhanced, and the rigid structure can prolong the service life of the device.

The invention relates to a compound of formula (I) wherein X is selected from the group consisting of-O-(CH2) n-wherein n is 0 to 4, R1 and R2 are independently selected from the group consisting of C11-C25 alkyl groups, SP is a spacer, in particular selected from the group consisting of saturated C4-C8 alkyl groups, unsaturated C4-C8 alkyl groups and substituted or unsubstituted C6 aromatic compounds, in particular substituted C6 aromatic compounds are alkyl substituted C6 aromatic compounds, Y is a heteroatom, n is 0 to 4, and R1 and R2 are independently selected from the group consisting of C11-C25 alkyl groups, SP is a spacer, in particular selected from the group consisting of saturated C4-C8 alkyl groups, unsaturated C4-C8 alkyl groups, and substituted or unsubstituted C6 aromatic compounds, in particular substituted C6 aromatic compounds are alkyl substituted C6 aromatic compounds. L is a peptide synthesis linker, in particular selected from the group consisting of-O-and-NH-, L is a peptide synthesis linker, and m is 0 or 1, in particular m is 1.

The invention provides a preparation method for preparing porous carbon based on an aerogel method, the porous carbon and application of the porous carbon, and belongs to the technical field of porous carbon material preparation. The preparation method comprises the following steps: mixing polyhydroxy phenol, aromatic aldehyde, acrylamide, graphene oxide and lithium salt according to a mass ratio of 100: (50-200): (5-30): (1-5): (1-5), carrying out hydrothermal reaction at 100-200 DEG C for 1-6 hours, and freeze-drying at-40 DEG C to obtain a hydrogel precursor; and carbonizing the precursor in organic heteroatom gas at 500-800 DEG C, mixing the intermediate with alkali according to the ratio of 100: (100-500), activating at 900-1100 DEG C, pickling and drying to obtain the porous carbon. The conductivity of the product is improved by means of graphene, lithium salt and heteroatoms, and the aerogel method obtains large aperture, has the characteristics of low impedance, high first efficiency and small charge-discharge expansion, and can be efficiently applied to silicon-carbon materials.

The invention discloses an electrolyte based on a fluorine-containing polynitrile compound and a high-voltage supercapacitor, and belongs to the field of energy storage materials. The electrolyte comprises a fluorine-containing polynitrile compound, an organic solvent and electrolyte salt; the structure of the fluorine polynitrile compound is as follows: Fm-A-(CN) n, wherein A is C1-C10 alkyl, C6-C14 aryl or a heteroatom-containing linking group, m is greater than or equal to 1, and n is greater than or equal to 2. By introducing the Fm-A-(CN) n structure compound and utilizing the synergistic effect of fluorine atoms and cyano groups, a stable interfacial film is formed on the surface of an electrode, so that the working voltage of the electrolyte is increased to 3-3.2 V. The capacitance decay rate of the electrolyte in the range of 60-80 DEG C is lt; the method is suitable for the fields of vehicle-mounted energy storage, power grid frequency modulation and the like.

The invention belongs to the technical field of rubber auxiliaries and rubber tracks, and particularly relates to a coupling agent composition for inhibiting rubber appearance flooding and application of the coupling agent composition in the rubber tracks. The coupling agent composition comprises the following components in percentage by weight: 15%-30% of coupling agent, 1%-15% of metal chloride and 70%-85% of clay mineral. Different from a microcapsule technology only aiming at anti-aging agent migration, the coupling agent composition disclosed by the invention can effectively capture various types of color-flooding source substances including carbon black residues, anti-aging agents, antioxidants and the like by starting from common characteristics (containing unsaturated bonds, heteroatoms and aromatic structures) of color-flooding small molecules and through the synergistic effect of the coupling agent and metal ions, so that the color-flooding source substances can be effectively captured. And the method has wide applicability. In addition, a composite system composed of the clay, the coupling agent and the metal chloride can improve the bonding strength of the rubber and a track framework material, and is suitable for being applied to a heavy-load rubber track.

Disclosed are biodegradable polyesters. Methods for their production and adhesives prepared therefrom. The polyesters comprise a plurality of adducts of two dicarboxylates or anhydrides with a compound having at least two fused ring heterocycles containing a heteroatom and a hydroxyl group pendant from each ring, the adducts are linked by the residues of one or more diols of alkylene diols or polyoxyalkylene diols and a plurality of one or more aliphatic diols containing a pendant carboxylate group. Ester groups are formed by reaction of the hydroxyl groups of the fused ring compounds and the diols with the carboxylate groups of the dicarboxylates and the composition contains pendant carboxylate groups, wherein the composition contains two dicarboxylates, a first dicarboxylate or an anhydride containing between the carboxylate or carboxyl groups a C1-8 hydrocarbylene group and a second dicarboxylate containing between the carboxylate groups a C9-60 hydrocarbylene group.

The invention discloses a hydrogen energy fuel cell catalyst carrier based on a graphene graft polymer, which is characterized in that two-dimensional graphene is used as a substrate, the surface of the two-dimensional graphene is modified with an oxygen-containing functional group, and a functional polymer branch chain containing nitrogen, sulfur or phosphorus heteroatoms is covalently grafted to form a local three-dimensional network winding structure; the carrier is loaded with platinum, palladium, ruthenium and other metal or alloy nanoparticles, the particle size is 2-8 nm, the loading capacity is 10%-40%, and the particles are anchored to polymer functional sites or reduced in situ to a graphene defect area through coordination. A polymer branch chain has pH responsiveness and can adjust the local proton transmission efficiency; the grafting density is 3-15 grafting points per 100 carbon atoms, so that high dispersion and stable anchoring of metal particles are effectively realized; the specific surface area of the carrier is 400-800m < 2 > / g, the electrochemical active area is not less than 80m < 2 > / g, and the activity retention rate is greater than 80% after 5000 circles of accelerated durability tests. The activity, the stability and the proton conduction performance of the catalyst are remarkably improved, and the catalyst is suitable for high-performance fuel cells.

Disclosed are biodegradable polyesters prepared from bio sourced materials and methods for their production. The polyesters comprise a plurality of adducts of two dicarboxylates or anhydrides with a compound having at least two fused ring heterocycles wherein each heterocycle contains a heteroatom of oxygen or sulfur and at least one hydroxyl group pendant from each ring. wherein the plurality of adducts are linked by a plurality of residues of one or more diols of alkylene diols or polyoxyalkylene diols and a plurality of one or more aliphatic diols containing a pendant carboxylate group wherein ester groups are formed by reaction of the hydroxyl groups of the fused ring compounds and the diols with the carboxylate groups of the dicarboxylates and the composition contains pendant carboxylate groups.

The invention discloses a preparation method of phosphorus-doped and closed-pore synergistically regulated biomass hard carbon and application of the phosphorus-doped and closed-pore synergistically regulated biomass hard carbon in a negative electrode of a sodium-ion battery, and belongs to the technical field of electrode materials. The preparation method comprises the following steps: preparing a water-based starch suspension with a certain mass fraction by taking starch as a biomass precursor, carrying out a cross-linking reaction through sodium trimetaphosphate to form a phosphate ester bond bridged stable network structure, pre-oxidizing the cross-linked precursor, and then carbonizing in a high-temperature inert atmosphere to obtain the water-based starch composite material. And the hard carbon material with expanded interlayer spacing, phosphorus doping and high closed pore volume is prepared. The material shows high reversible capacity, high initial coulombic efficiency, excellent rate capability and cycling stability when being used as a sodium-ion battery negative electrode active material. According to the preparation method disclosed by the invention, through a simple cross-linking-carbonizing process, cooperative regulation and control of heteroatom doping and a closed-pore structure are realized, and a new strategy is provided for large-scale preparation of the high-performance biomass hard carbon negative electrode.

The invention relates to a preparation method of a carbon-based gold-containing bimetallic catalyst. The specific method comprises the following steps: carrying out secondary doping on eigenstate polyaniline, carrying out high-temperature pyrolysis in an inert atmosphere to obtain a heteroatom-doped carbon-based carrier, and changing the variety, the content and the distribution of heteroatoms on the carbon surface of the carrier by adjusting the variety and the content of acid. And preparing gold-containing bimetallic nanoparticles by using a colloid method, and depositing bimetallic particles by virtue of adsorption of the carbon carrier and bimetallic to obtain the carbon-based gold-containing bimetallic catalyst. Wherein the doping element can anchor and disperse the noble metal, and the introduced second metal can improve the hydrogenation activity of the catalyst. The catalyst is simple in preparation process, good in activity, excellent in selectivity and excellent in cycling stability, is particularly suitable for a reaction for preparing 4-chloroaniline through catalytic hydrogenation of 4-chloronitrobenzene, and has good application potential.

The invention discloses a solid electrolyte-coated silicon-carbon composite material and a preparation method thereof, and is characterized in that a negative electrode material has a core-shell structure, the core is metal-doped porous carbon and nano silicon deposited in pores, and the shell is a solid electrolyte complex. The preparation method comprises the following steps: uniformly mixing an emulsifier, a phenolic compound, an aldehyde compound, a cross-linking agent, a metal salt of the cross-linking agent and a template agent, then adding an oxidizing agent for reaction, and preparing metal-doped porous carbon through heteroatom doping and activation; depositing nano silicon through a vapor deposition method, coating the surface of the nano silicon with a solid electrolyte through a liquid phase method, and carbonizing to obtain the solid electrolyte coated silicon-carbon composite material. The obtained material has the characteristics of excellent fast charging performance, high initial efficiency and the like when applied to lithium ion batteries.

The application belongs to the technical field of deep eutectic solvents, and particularly relates to a ternary deep eutectic solvent and preparation and application thereof. The ternary deep eutectic solvent is composed of choline chloride, 5-sulfosalicylic acid and gamma valerolactone according to a molar ratio of 1:4:(3-25). The strong hydrogen bond network structure between the green solvent system first destroys the ester bond between lignin and hemicellulose, then cuts off the beta-O-4 bond between lignin molecules, so as to separate lignin. Meanwhile, the deep eutectic solvent can improve the stability of carbon cations due to the conjugation effect between the lone pair electrons on the heteroatom oxygen and the central carbon in the molecular structure of gamma valerolactone, so as to inhibit the condensation reaction of lignin.

According to the heteroatom-doped carbon nanohorn catalyst and the preparation method and application thereof, doping elements are accurately introduced into a carbon nanohorn framework in the preparation process of the catalyst, a stable heterostructure is formed, two-dimensional adsorption and activation of O2 molecules on the surface of an electrode are effectively enhanced, a two-electron reduction path is remarkably promoted, and the heteroatom-doped carbon nanohorn catalyst is prepared. The four-electron reduction side reaction is inhibited, the H2O2 selectivity and the oxygen reduction reaction (ORR) activity are enhanced, and the H2O2 yield and the Faraday efficiency are remarkably improved. Meanwhile, the heteroatom-doped carbon nanohorn catalyst has high electrochemical stability in a chloride ion-containing system, shows excellent stability and corrosion resistance under a natural seawater condition, and is suitable for long-time continuous operation.

Organotin compositions having the formula RSnL3 and corresponding synthetic methods are described. R includes aromatic, cyclic and / or halogenated ether moieties, or polyethers, and L includes hydrolysable groups. The organotin compositions may be formed as radiation-patternable coatings on substrates. The coatings may have an average thickness from about 1 nm to about 75 nm and have the formula RSnOn(OH)3-2n, forming an oxo-hydroxo network, where R is a hydrocarbyl ether group with 1 to 30 carbon atoms and 0<n<3 / 2, wherein regions of the coating are soluble in 2-heptanone in a puddle development step following a bake at 150° C. for 120 seconds. The coatings may be radiation-patternable using UV, EUV or ion beam radiation, and corresponding methods are described.

The invention discloses a multi-target joint optimized antibiotic molecule design system and method applied to the field of biological medicine, and the method comprises the steps: obtaining FabI enzyme and AcrAB-TolC efflux pump structure data, extracting double-target space and physicochemical characteristics, and constructing a joint pharmacophore model containing a FabI inhibition domain and an efflux pump blocking domain; screening candidate molecules meeting a double-domain space matching threshold, screening high-affinity double-target molecules through conformation sampling and free energy calculation, and forming a lead compound library through multi-layer filtration of metabolic stability, membrane penetrability, quantum chemical properties and synthesis feasibility; carrying out electron effect, chain length or heteroatom fine tuning on dominant molecules through in-vitro bacteriostasis and efflux inhibition experiment feedback, and carrying out iterative optimization until MIClt is met; 2 [mu] g / mL and the efflux inhibition rate is gt; according to the present invention, the antibacterial effect and the drug resistance inhibition ability are significantly improved, the molecular synthesizability and the biological safety are ensured, and the engineering design new path is provided for the Gram-negative bacterium drug resistance crisis.

A method of forming an ionic liquid at room temperature combining a first heterocyclic compound having at least one heteroatom in a first heterocycle ring and a second heterocyclic compound having at least one heteroatom in a second heterocycle ring, wherein the first heterocyclic compound acts as a Brønsted acid and the second heterocyclic compound acts as a Brønsted base in an acid-base reaction to form the ionic liquid is disclosed. Furthermore, a carbon dioxide sorbent comprising the ionic liquid and a porous support is claimed. A method of forming the carbon dioxide sorbent comprising incorporating the ionic liquid in pores of a porous support is also disclosed.

The invention relates to the field of batteries, in particular to a solid electrolyte, a preparation method of the solid electrolyte, a battery, a battery assembly and an electric device. The coating layer is arranged on the surface of the solid electrolyte main body, the coating layer contains a coating agent, the coating agent contains hydrophobic groups and heteroatom groups, and heteroatoms in the heteroatom groups comprise at least one of N, P, S and O. The solid electrolyte has excellent air stability.

The invention provides a micromolecular acrylate compound and a preparation method and application thereof, the micromolecular acrylate compound has a structure as shown in the following formula I. In the formula I, L is selected from hydrogen or a group as shown in the following formula I-0, and A is selected from a biaromatic ring containing heteroatoms or a fused ring containing heteroatoms; x1 and X2 are independently selected from hydrogen or methyl; and m1 and m2 are each independently an integer from 1 to 7. According to the invention, the refractive index of the micromolecular acrylate compound can be improved, the high refractive index and low viscosity of the micromolecular acrylate compound are both considered, and the application of a nanoimprint process is met.

According to the method, a heteroatom EWT structure molecular sieve with a framework containing aluminum atoms and heteroatoms is adopted as a catalyst, the molecular sieve has the advantage of improving the utilization rate of an acid center, and when the molecular sieve is used for a gas-phase non-hydroisomerization reaction of the unsym-trimethylbenzene, the utilization rate of the acid center is increased; according to the present invention, the activity, the selectivity and the stability are high, the catalytic performance is significantly improved, the mesitylene selectivity and the mesitylene yield are higher than the heteroatom-free [Si, Al]-EWT structure molecular sieve, and the by-products such as tetratoluene and xylene are significantly reduced.

The invention belongs to the technical field of energy storage materials, and particularly discloses preparation and application of a high-performance asphalt-based porous carbon material. The method comprises the following steps: pre-treating asphalt; carrying out hydrothermal synthesis on microcrystalline cellulose and phytic acid to obtain cellulose ester; the preparation method comprises the following steps: compounding humic acid, hectorite powder and cellulose ester, and freeze-drying to obtain a compound additive; carrying out microwave-hydrothermal reaction on the pretreated asphalt and a compound additive to form a precursor; and activating the precursor, carbonate and phosphate in a multi-section gradient atmosphere, and finally washing and drying to obtain the porous carbon material. According to the method, strong base etching is replaced by synergistic pore-forming and atmosphere activation of the composite additive, so that green controllable pore expansion and uniform doping of heteroatoms are realized; and a graded pore channel structure is accurately constructed through multi-section carbonization. The obtained material has a three-dimensional interpenetrating network, a high specific surface area and excellent conductivity, can effectively buffer ion embedding stress, remarkably improve electrochemical stability and inhibit volume expansion, and is suitable for lithium and sodium ion battery negative electrodes and supercapacitor electrodes.

The invention relates to the technical field of preparation of positive electrode materials, and discloses a method for preparing a lithium iron phosphate positive electrode material from an atom-doped carbon coating layer, in particular to a method for preparing a lithium iron phosphate positive electrode material from the carbon coating layer on the surface of the lithium iron phosphate positive electrode material containing a plurality of heteroatoms M, and the molecular formula of the heteroatoms M is LiFePO4 / C (at) M. The preparation method comprises the steps of grinding twice and sintering, the structure of the carbon material is adjusted by utilizing the synergistic coupling characteristic of doped atoms, and the high electron mobility and ion mobility of the lithium iron phosphate positive electrode material are enhanced. The prepared positive electrode material has excellent electrochemical performance, and the charge-discharge specific capacity and the rate capability are improved.

The invention provides a negative electrode active material and a preparation method and application thereof, the negative electrode active material comprises a modified carbon-coated silicon negative electrode material and a modified carbon nanotube, and the modified carbon-coated silicon negative electrode material comprises a carbon-coated silicon negative electrode material and heteroatoms; the carbon-coated silicon negative electrode material comprises a silicon material and a carbon layer coated on the outer surface of the silicon material, heteroatoms are arranged inside or / and on the surface of the carbon layer, and the heteroatoms comprise at least one of O, N and F elements; the modified carbon nanotube is wound on the surface of the modified carbon-coated silicon negative electrode material, the modified carbon nanotube comprises a carbon nanotube and a first oxygen-containing functional group, the first oxygen-containing functional group is arranged on the end surface or / and the defect position of the carbon nanotube, and the first oxygen-containing functional group is connected with the carbon layer through a hydrogen bond. According to the negative electrode active material, the heteroatoms and the first oxygen-containing functional group are introduced, so that the conductivity of the negative electrode active material can be improved, and the expansion of the silicon material in the charging and discharging process is inhibited.

The preparation method comprises the following steps: S1, uniformly mixing a lithium source, an iron source, a phosphorus source, a fast ion conductor and a rare earth compound, adding ethanol and an MOF material, and sintering at the temperature of 100-200 DEG C for 1-3 hours to obtain a lithium iron phosphate precursor A; s2, transferring the lithium iron phosphate precursor A into a tubular furnace, raising the temperature to 300-500 DEG C, introducing heteroatom gas, raising the temperature to 700-900 DEG C, and introducing carbon source gas to obtain a lithium iron phosphate precursor B; and S3, dispersing the lithium iron phosphate precursor B, a carbon source and a functional additive into a solvent, performing spray drying, and performing high-temperature sintering for 2-12 hours to obtain the high-capacity and high-compaction lithium iron phosphate positive electrode material. The diffusion path of lithium ions is shortened, and the transmission performance of the lithium ions is remarkably improved; meanwhile, the specific capacity of the material is improved; and moreover, agglomeration of iron phosphate is avoided, the coating uniformity is improved, the power performance is improved, and the compaction density of the lithium iron phosphate material is further improved.

The invention belongs to the technical field of biochemistry, and discloses a chemiluminescent probe responding to beta amyloid protein as well as a preparation method and application thereof. The structural formula of the probe is shown in the specification. According to the probe designed by the invention, the near-infrared chemiluminescence capability (gt; 650nm) is realized through an extended conjugated structure; meanwhile, high selectivity on A beta is realized by introducing a heteroatom conjugate pi bridge.

The invention discloses nitrogen-doped carbon quantum dots derived from American cockroach dregs as well as a preparation method and application of the nitrogen-doped carbon quantum dots, and belongs to the technical field of nitrogen-doped carbon quantum dots. The nitrogen-doped carbon quantum dots are prepared from the American cockroach dregs by a one-step hydrothermal method, optimal synthesis parameters are obtained through experimental optimization of synthesis conditions, and the prepared nitrogen-doped carbon quantum dots have excellent optical characteristics and stability; the invention also provides an application of the nitrogen-doped carbon quantum dot in Ag < + > detection, the nitrogen-doped carbon quantum dot has good selectivity, sensitivity and anti-interference performance on Ag < + >, a detection mechanism is an internal filtering effect and light-induced electron transfer, and the nitrogen-doped carbon quantum dot can be used as a preferred fluorescent material of an Ag < + > fluorescent sensor. The nitrogen-doped carbon quantum dots synthesized by the method not only have an Ag < + > sensing function, but also realize high-valued utilization of medicine residues, and also provide a new thought for self-doping of heteroatoms.