1110results about "Nano-carbon" patented technology

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 belongs to the technical field of lithium battery materials, and particularly relates to a lithium trifluoromethanesulfonate in-situ doped graphdiyne composite material and a preparation method and application thereof. The preparation method of the lithium trifluoromethanesulfonate in-situ doped graphdiyne composite material adopts a one-step in-situ synthesis method, and specifically comprises the following steps: adding hexaacetylene benzene and lithium trifluoromethanesulfonate into a solvent, mixing, adding a catalyst, carrying out a heating reaction, and carrying out post-treatment on the obtained reactant to obtain the lithium trifluoromethanesulfonate in-situ doped graphdiyne composite material. Finally, the lithium trifluoromethanesulfonate in-situ doped graphdiyne composite material is obtained. The preparation method of the lithium trifluoromethanesulfonate in-situ doped graphdiyne composite material provided by the invention is simple in process, the prepared composite material is good in interface stability, and when the composite material is applied to a negative electrode of a lithium ion battery, the electrochemical performance of the battery can be improved, and the service life of the battery can be prolonged.

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 invention discloses a preparation method of ocimum gratissimum carbon dots and application of the ocimum gratissimum carbon dots in antibacterial drugs and food preservation. The preparation method of the ocimum gratissimum carbon dots comprises the following steps: performing steam distillation on ocimum gratissimum leaves to remove essential oil, drying in the shade, and crushing; adding an alcohol solvent into the powder, extracting, filtering, concentrating and drying to obtain an alcohol extract; dispersing the alcohol extract in distilled water, and stirring and pyrolyzing on a heating table; and diluting the pyrolysis product with distilled water, centrifuging, taking supernate, filtering with a filter membrane, dialyzing, and freeze-drying to obtain the carbon dots. The obtained carbon dots have a carbon dot-vesicle coexisting structure, and the average particle size is 5.732 + / -0.5 nm. The prepared ocimum gratissimum carbon dots can be applied to preparation of antibacterial drugs, especially drugs for inhibiting the activity of bacillus cereus and listeria, and the field of food preservation, and have the advantages of being wide in raw material source, simple in preparation method, low in cost, environmentally friendly and the like.

The invention discloses a high-performance sodium ion battery negative electrode ZnS / CoS (at) C composite material and a preparation method thereof, the material preparation method has the characteristics of definite control parameter, easy purity control, simple operation, good process repeatability and the like, and the prepared sodium ion secondary battery negative electrode material has excellent sodium ion intercalation and deintercalation capability and can be used for preparing a sodium ion secondary battery negative electrode material. The specific capacity, the cycling stability, the coulombic efficiency and the rate capability of the sodium ion secondary battery can be effectively improved, the requirements of different conditions can be met, and the application prospect is wide.

The invention discloses a mucosal epithelial cell targeted oral ROS response type nano-enzyme as well as a preparation method and application thereof, and relates to the technical field of biological medicines. The oral ROS response type nano-enzyme comprises Ce-CDs carbon dots and a betaine polymer, and the betaine polymer is coated on the surfaces of the Ce-CDs carbon dots to form nano-particles; the Ce-CCDs carbon dots are prepared by taking a metal cerium source and chlorogenic acid as raw materials through a pyrolysis method. Through structural innovation and function integration, the prepared nano-enzyme shows outstanding advantages in the aspects of catalytic activity, targeted delivery, collaborative treatment, industrial application and the like, a new technical scheme is provided for efficient and safe treatment of inflammatory bowel diseases, and the nano-enzyme has remarkable technical innovation and clinical application value.

A composite, comprising a binder, the binder comprising one or more of polymeric, metallic, or ceramic, or pyrolytic carbon binder and a nanostructured carbon having a cellular structure. The cellular structure comprises one or more cell walls having a structure formed by a template and one or more cavities. Each cavity is substantially enclosed by the one or more cell walls and substantially unimpregnated by a liquid or solid.

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 a lycium ruthenicum biomass carbon dot as well as a preparation method and application thereof. The novel lycium ruthenicum carbon dots are prepared by taking lycium ruthenicum as a raw material and adopting a one-step hydrothermal method, and the novel lycium ruthenicum carbon dots are used for detecting residual herbicides in soil without being interfered by other substances. The method for detecting the herbicide residues in the soil by adopting the prepared novel carbon dots is superior to a large instrument, the detection method has the advantages of simplicity in operation, low cost, high sensitivity and the like, the source of the lycium ruthenicum is wide, and the preparation process is green and environment-friendly. Therefore, the prepared carbon dots provide a new method for detection of the fine phosphinate ammonium salt, and a thought and a method are provided for specific application in agricultural production.

The invention relates to the technical field of pharmaceutical preparations, in particular to a preparation process of carbon dots for killing helicobacter pylori and application of the carbon dots in oral pharmaceutical preparations. The preparation method comprises the following steps: mixing microcrystalline cellulose and glycerol, freezing and crushing at an ultralow temperature, and selectively hydrolyzing by combining citric acid-malic acid mixed acid liquor to efficiently prepare a high-crystallinity cellulose nanocrystal template; the controllable synthesis of the carbon dots is realized by utilizing the hydrogen-bond interaction of hydroxyl / carboxyl on the surface of the cellulose nanocrystal and the nitrogen doping effect in the polymerization and carbonization process of citric acid and urea. Besides, when a sodium alginate-chitosan double-layer structure is constructed, carbon dots are introduced into the inner layer to endow the inner layer with special performance, a protein-polysaccharide network is formed on the outer layer through transglutaminase enzymatic crosslinking, and the oxidation resistance and mechanical strength are enhanced through secondary curing of tea polyphenol. According to the invention, food-grade raw materials are used for realizing high-efficiency antibiosis, the oral preparation safety specification is met, and the clinical transformation potential is realized.

The invention relates to a method for preparing a hard carbon material from carbon dot heterogeneous cross-linked bituminous coal, a coal-based hard carbon material and application. The preparation method comprises the following steps: (1) soaking pretreated bituminous coal in an acid solution, washing to be neutral, and drying to obtain dry pulverized coal; (2) dispersing the carbon dots in an alcohol solvent for ultrasonic treatment to obtain a dispersion liquid; (3) mixing the dried pulverized coal obtained in the step (1) and the dispersion liquid obtained in the step (2), mechanically stirring, and drying to obtain a mixture; (4) performing low-temperature heating crosslinking on the mixture obtained in the step (3) in an oxygen-containing atmosphere so as to obtain a heterogeneous crosslinking product; and (5) performing high-temperature carbonization on the heterogeneous cross-linked product in an inert atmosphere to obtain the coal-based hard carbon material. The coal-based hard carbon material can be used as a sodium ion battery / potassium ion battery negative electrode, and has excellent sodium / potassium storage performance.

The invention relates to a preparation method and application of carbon nanosphere modified biomass monolithic composite porous carbon, and belongs to the field of energy and chemical industry, and the preparation method comprises the following steps: S1, cutting pine into pine chips, drying, and carbonizing at high temperature to obtain a carbonized product; s2, dipping the carbonized product in a hydrochloric acid solution, then washing the carbonized product to be neutral, dehydrating the carbonized product, and polishing the dehydrated carbonized product; s3, putting the composite porous carbon into a glucose solution, carrying out vacuum-assisted impregnation, transferring into a hydrothermal reaction kettle, carrying out hydrothermal carbonization, drying, and carrying out constant-temperature chemical conversion; and S4, placing the composite porous carbon in a potassium bicarbonate solution for vacuum impregnation, drying and dehydrating, placing in a tubular furnace for constant-temperature chemical conversion to obtain a converted and carbonized product, impregnating in hydrochloric acid, washing, and drying. The specific surface area of the integral composite porous carbon is effectively increased, the electrode / electrolyte interface contact characteristic is remarkably optimized, and the pore channel space utilization rate and the energy storage performance are synchronously improved.

The invention relates to a platinum-zinc alloy supported nitrogen-doped porous multi-layer carbon material and preparation and application thereof, the carbon material takes a rod-like graded porous carbon nanomaterial as a carrier, and platinum-zinc alloy particles and zinc monatomic are jointly supported on the surface of the carrier; the preparation method comprises the following steps: S1, adding zinc acetate and hexadecyl trimethyl ammonium bromide into DMF (Dimethyl Formamide), carrying out ultrasonic treatment, adding into a polyacrylonitrile solution, and stirring; s2, performing electrostatic spinning on the obtained spinning precursor solution; s3, adding the obtained nanofiber into a zinc acetate dihydrate solution, then adding a dimethylimidazole solution, carrying out hydrothermal reaction, soaking the obtained product in a chloroplatinic acid methanol solution, and then carrying out freeze drying; and S4, heating carbonization is carried out under the protection of an inert atmosphere, then annealing and cooling are carried out, and the PtZn-Zn-N4-HPCNFs material is obtained. Compared with the prior art, the catalytic performance and the like in the reaction processes of oxygen reduction reaction (ORR), chlorine evolution reaction (CER) and the like can be effectively improved.

The invention provides a positive active material and a preparation method thereof, a positive plate and a battery. The positive electrode active material comprises an inner core and a shell layer coating at least part of the surface of the inner core; the inner core comprises LiMn < 1-x > FexMyPO4; wherein 1-x is greater than 0; x > 0; y > 0; the M element comprises one or more of Mg, Ca, Sr, Co, Ti, Zr, Ni, Cr and Zn; the shell layer comprises a carbon element and a nitrogen element. The positive electrode active material provided by the embodiment of the invention has relatively good electron and ion conductivity, can stabilize Mn ions in the positive electrode active material, and is beneficial to reducing impedance of a battery and improving capacity, initial charging efficiency and capacity retention rate of the battery.

The invention discloses an OER electrocatalyst as well as a preparation method and application thereof, and belongs to the technical field of electrolyzed water. The OER electrocatalyst is a Ni (OH) 2-CoWO4 / Co3W3C-coated CNF heterojunction composite material with a 3D (three-dimensional) structure. According to the preparation method, a CNF nano array is taken as a substrate, and the Ni (OH) 2-CoWO4 / Co3W3C-coated CNF multilevel heterostructure composite material is prepared through in-situ growth of CoWO4 / Co3W3C and in combination with water bath etching treatment. The in-situ constructed heterostructure catalyst not only improves the stability of the material structure, but also effectively improves the catalytic performance of OER. The preparation technology is simple, large-scale implementation is easy, and the method is suitable for preparing the high-performance OER anode material in batches.

The invention belongs to the technical field of preparation of wave-absorbing materials, and particularly relates to a cobalt-based nitrogen-doped carbon nano composite material with a hollow cubic structure as well as a preparation method and application thereof. Comprising the following steps: taking ZnCo-ZIF with a nano cubic structure as a core, coating ZnCo-ZIF with polydopamine by adopting a precipitation method to form a precursor with a core-shell structure, and carbonizing the precursor at 800-900 DEG C to obtain the cobalt-based nitrogen-doped carbon nano composite material with the hollow cubic structure. According to the invention, the dielectric loss capability can be enhanced by using the conductivity and interface polarization effect of the coated carbon layer, and the Co particles introduce strong magnetic loss; meanwhile, due to interface polarization caused by abundant heterogeneous interfaces existing between the Co particles and the coating carbon layer, between the magnetic particles and the carbon nanotubes and between the carbon matrix and the carbon nanotubes in the composite material, the impedance matching characteristic can be improved, and high reflection loss and wide effective absorption bandwidth can be achieved under the low matching thickness.

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.

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 discloses a double-carbon-layer-coated spherical silicon carbon material which is characterized in that spherical silicon carbon is used as an inner core, the outer surface of the spherical silicon carbon is sequentially coated with an isotropic hard carbon layer and a composite carbon layer, and the isotropic hard carbon layer and the composite carbon layer form a double-layer carbon coating layer; the spherical silicon carbon is a composite porous carbon microsphere in which disordered silicon is uniformly distributed and the surface is provided with a silicon-oxygen layer; the composite porous carbon microspheres comprise isotropic soft carbon and isotropic hard carbon, and the composite carbon layer comprises graphitized carbon and isotropic soft carbon; the mass of the isotropic soft carbon and the isotropic hard carbon in the composite porous carbon microspheres accounts for 42%-76% of the mass of the double-carbon-layer-coated spherical silicon carbon material, and the mass of the disordered silicon accounts for 22%-76% of the mass of the double-carbon-layer-coated spherical silicon carbon material; the oxygen element accounts for 0.1-2% of the mass of the double-carbon-layer-coated spherical silicon carbon material; the nitrogen element accounts for 0-0.08% of the mass of the double-carbon-layer-coated spherical silicon carbon material; the comprehensive performance of the silicon-carbon negative electrode material, the rate capability of the battery and the capacity reversibility are improved.

The invention discloses a preparation method and application of a chlorogenic acid carbon quantum dot microsphere capsule, a natural active product chlorogenic acid (CHA) in coffee is used as a raw material, and chlorogenic acid carbon quantum dots (CHA CDs) with anti-inflammatory and antioxidant activity are synthesized through a hydration method; then, the chlorogenic acid carbon quantum dots (CHACDs) are packaged with chitosan, and meanwhile, the chitosan on the outer layer of the capsule is modified with the DNA aptamer, so that the chlorogenic acid carbon quantum dot microsphere capsule Apt-CS (at) CHA CDs are obtained. The chlorogenic acid carbon quantum dot microsphere capsule disclosed by the invention not only has anti-inflammatory and antioxidant activity, but also can regulate intestinal flora, enhance intestinal barrier function and immune conditions; moreover, the microsphere capsule can be retained in the intestinal tract for a long time, so that the microsphere capsule can resist inflammation and remove high-level reactive oxygen species (ROS), can be retained in the intestinal tract for a long time and play a role in regulating intestinal flora, finally, the disease development of IBS is comprehensively relieved, and the microsphere capsule has a very good application prospect.

The invention discloses a three-dimensional bio-based hierarchical pore nanocarbon water photovoltaic power generation material as well as a preparation method and application of the three-dimensional bio-based hierarchical pore nanocarbon water photovoltaic power generation material. The specific technical scheme of the preparation method comprises the following steps: firstly, preparing an acetic acid solution containing chitosan, glucose and borax, and standing the solution at room temperature for 24 hours; then, freeze-drying the precursor solution, and pre-carbonizing xerogel in a drying oven for a certain time; and finally, adding a certain amount of water into the pre-carbonized dry gel, putting the pre-carbonized dry gel into a reaction kettle with a polytetrafluoroethylene lining, reacting for a certain time at a certain temperature, dialyzing the obtained wet gel, and drying at normal temperature and normal pressure to prepare the nano carbon aerogel with the hierarchical pore structure. The nano carbon aerogel has good hydrophilicity, abundant surface charges and a hierarchical pore structure, and is a low-cost and excellent water evaporation induced power generation material.

The invention discloses an alloying method which comprises the following steps: smelting silicon and aluminum to form a silicified aluminum alloy, grinding the silicified aluminum alloy to a nanometer level through a ball milling method, adding hydrochloric acid with a certain concentration into an obtained product, and washing and drying the product to obtain porous nanometer silicon powder. And carrying out carbon coating by using the obtained porous nano silicon powder as a raw material through CVD (Chemical Vapor Deposition), adding the porous nano silicon powder into a rotary furnace, introducing a carbon source, and depositing carbon on the surface and in holes of the porous silicon to finally obtain the nano silicon-carbon powder composite material.

The invention provides a phosphorus-doped nitrogen-rich porous carbon nanosheet for regulating nitrogen activity as well as a preparation method and application of the phosphorus-doped nitrogen-rich porous carbon nanosheet, and belongs to the technical field of preparation of negative electrode materials. The preparation method of the phosphorus-doped nitrogen-rich porous carbon nanosheet for regulating and controlling the nitrogen activity comprises the following steps: adding a metal source solution into an amine compound solution, stirring to obtain a precipitate, washing and drying to obtain a nanosheet precursor, then heating in an inert gas atmosphere, preserving heat to obtain a two-dimensional N / C nanosheet, and finally phosphating the two-dimensional N / C nanosheet, the amine compound comprises hexamethylenetetramine. The phosphorus-doped nitrogen-rich porous carbon nanosheet for regulating and controlling the nitrogen activity has relatively large interlayer spacing and rich pore defects and edge sites, can adsorb more Na < + >, can effectively reduce the diffusion distance of Na < + >, and has excellent conductivity as a negative electrode material.

The invention provides a preparation method of lithium iron phosphate, lithium iron phosphate and a lithium ion battery, and belongs to the technical field of new energy batteries. The preparation method comprises the following steps: providing ternary composite iron phosphate; mixing the ternary composite iron phosphate with a lithium source and a ligand in a solvent to form a precursor solution, and spraying a nitrogen source solution into the precursor solution in a spraying form to obtain slurry; drying the slurry to obtain a solid precursor; and carrying out heat treatment on the solid precursor in an atmosphere containing red phosphorus steam, and cooling to obtain the lithium iron phosphate. The ternary composite iron phosphate with a specific proportion is adopted as the raw material, so that the electrochemical performance of the lithium iron phosphate is effectively improved; the preparation method is simple in process, easy to control and capable of realizing large-scale industrial production. The prepared lithium iron phosphate has high specific capacity, long cycle life and good rate capability, and the overall performance of the lithium ion battery is remarkably improved.

A phosphate positive electrode active material, a preparation method therefor, a positive electrode sheet, a battery cell and an electrical apparatus. The method comprises: providing a mixed solution comprising a lithium source, a metal source, a phosphorus source and a surfactant, the metal source being an iron source and / or a manganese source; subjecting the mixed solution to a hydrothermal reaction to prepare reaction particles; mixing the reaction particles with a carbon source, and wet grinding same to obtain a paste; and performing heat treatment on the paste to prepare a phosphate positive electrode active material, the temperature of the heat treatment being 650℃ to 1300℃. The present method improves the conductivity and the capacity per gram of the carbon-coated phosphate positive electrode active material, increases the charge-discharge capacity and the cycle capacity retention rate of battery cells, and greatly enhances the continuity of production processes. The positive electrode sheet, battery cell and electrical apparatus having the beneficial effects of the positive electrode active material can be achieved.

The invention provides a preparation method and application of a lithium iron phosphate positive electrode material, and belongs to the technical field of lithium batteries. The method comprises the following steps: S1, providing a mesoporous template; s2, filling a pore channel of the mesoporous template with an iron source and a phosphorus source through gas-phase transmission, and performing heat treatment to form an iron-phosphorus oxide precursor; s3, enabling a lithium source to react with the iron phosphorus oxide precursor through gas-phase lithium infiltration to generate lithium iron phosphate; s4, depositing a continuous carbon layer on the surface of the lithium iron phosphate through chemical vapor deposition; and S5, removing the mesoporous template to obtain the lithium iron phosphate / carbon composite material with the three-dimensional bicontinuous network structure. According to the preparation method, efficient utilization of an iron source, a phosphorus source and a lithium source is realized through gas-phase transmission and gas-phase lithium infiltration, the preparation cost is reduced, a continuous carbon layer is deposited on the surface of lithium iron phosphate in the chemical vapor deposition step, and the conductivity and the cycling stability of the material are further improved.

The invention provides a preparation method and application of a cellulose-based hard carbon negative electrode material, and belongs to the technical field of sodium ion battery negative electrode material preparation. Comprising the following steps: preparing a strong oxidizing acid solution, adding a cellulose raw material into the prepared solution, carrying out ultrasonic vibration, and uniformly stirring; then adding a long-chain molecular compound into the mixture, and stirring until the mixture is uniformly mixed to obtain a mixed solution; then transferring into a hydrothermal reaction kettle for hydrothermal treatment, and after the hydrothermal reaction kettle is cooled to room temperature, centrifuging, washing and drying a hydrothermal product; and finally, transferring the hydrothermal product into a high-temperature tubular furnace, and performing high-temperature pyrolysis carbonization treatment in an inert atmosphere to obtain the cellulose-based hard carbon negative electrode material. A hard carbon precursor containing a large amount of carbonyl and nitrogen doping is constructed through a hydrolysis competition mechanism, then the hard carbon negative electrode material is prepared through high-temperature pyrolysis carbonization, and the problems of low reversible capacity of biomass derived hard carbon, poor first-week coulombic efficiency, battery performance optimization under extremely high and low temperature conditions and the like are solved.

The invention discloses a method for detecting glyphosate in coffee through Cu-CDs / ABEI (at) Ag nano-enzyme catalytic chemiluminescence, and belongs to the technical field of chemical analysis and detection.The method comprises the steps that 4-aminoantipyrine serves as a precursor, Cu < 2 + > serves as a doping element, copper-doped carbon dots (Cu-CDs) are synthesized through a microwave method, Cu-CDs and ABEI serve as reducing agents to synthesize the Cu-CDs / ABEI (at) Ag nano-enzyme, and the Cu-CDs / ABEI (at) Ag nano-enzyme is used for detecting glyphosate in coffee through Cu-CDs / ABEI (at) Ag nano-enzyme. The Cu-CDs / ABEI (at) Ag nano-enzyme has excellent peroxidase (POD-like) activity, so that H2O2 decomposition is promoted, and a chemiluminescence signal is enhanced; the glyphosate can interact with the Cu-CDs / ABEI (at) Ag nano-enzyme to inhibit the POD-like activity of the nano-enzyme, so that the chemiluminescence intensity generated by oxidation of ABEI is reduced; on the basis, the method is used for detecting glyphosate in a coffee sample, and has the characteristics of high specificity, simplicity in operation and sensitivity.

The invention discloses a carbon nanofiber and carbonaceous honeycomb framework composite conductive agent material and a preparation method thereof, and belongs to the field of carbon materials. The method comprises the following steps: blending ferric nitrate and nickel nitrate with citric acid according to a molar ratio of 3: 1 to prepare an impregnation precursor solution; dipping an organic colloidal crystal template and drying to obtain a catalyst precursor; in a double-temperature-zone tubular furnace, a carbon source and a catalyst precursor are synchronously heated in a specific atmosphere, and the composite material with a fishbone-shaped structure is obtained through one-step roasting. The material is a composite system of carbon nanofibers and a carbonaceous honeycomb structure, the electronic conductivity reaches 40-140 S / cm, the structure and thermal stability are good, and the rate capability and cycle life of an electrochemical energy storage system such as a lithium ion battery can be remarkably improved and prolonged as a conductive agent. The method is simple in process and mild in condition, and has a good application prospect.

The invention relates to a carbon quantum dot-ZIF-8 compound capable of being used for sewage detection as well as a preparation method and application of the carbon quantum dot-ZIF-8 compound. Through cooperation of the ZIF-8 and the carbon quantum dots, the carbon quantum dot-ZIF-8 compound is allowed to realize high-precision detection of tetracyclines through a double-peak ratio method.