869 results about "Oxygen vacancy" patented technology

The invention belongs to the technical field of monatomic nano-enzyme material preparation, and particularly relates to a nano-enzyme preparation method for acetylcholin esterase activity detection. The Ni-NiO heterojunction material is successfully synthesized by adopting Ni-MOF as a carrier and accurately regulating and controlling the ratio of nitrogen to air in the ultrafast Joule hot calcination process. The material has rich oxygen vacancies and metal Ni sites, the oxygen vacancies and the metal Ni sites can effectively serve as anchoring sites of Pt single atoms, the loading capacity and dispersity of the Pt single atoms are remarkably improved, and therefore the excellent nano-enzyme catalytic activity is shown. In addition, the preparation method disclosed by the invention is simple and convenient in process and has a wide industrial application prospect. An acetylcholin esterase activity colorimetric sensing method constructed on the basis of the nanometer enzyme for acetylcholin esterase activity detection prepared by the method has extremely high sensitivity and low detection limit. The detection limit of the technology can be as low as 0.037 mU / mL, the problem that the sensitivity of a traditional detection method in a low-concentration sample is insufficient is remarkably solved, and remarkable clinical application potential is shown.

The invention discloses a synthesis method of a hydrazine dicarboxylate modified cerium dioxide abrasive, and belongs to the technical field of precise polishing materials. The method comprises the following steps: taking cerous nitrate as a raw material, and preparing a cerous carbonate precursor through an ammonium carbonate precipitation reaction; and grinding and calcining the obtained precursor and hydrazine dicarboxylate to obtain the CeO2 grinding material with the surface rich in oxygen vacancies. And Ce < 4 + > can be partially reduced into Ce < 3 + > by reducing fragments generated by decomposition of the hydrazine dicarboxylate in the calcining process, so that an oxygen vacancy structure is formed through induction, and the chemical activity and the reaction rate of the abrasive are improved. The obtained grinding material shows excellent performance in chemical mechanical polishing (CMP) of K9 glass, the material removal rate (MRR) is increased by about 3.6 times compared with that of unmodified CeO2, the surface roughness (Ra) is reduced to about 0.16 nm or below, and grinding material particles are good in dispersity and less in agglomeration. The used hydrazine dicarboxylate is stable, low in toxicity and mild in reaction, and the particle size can be prevented from excessively growing while the high oxygen vacancy concentration is kept.

The invention discloses an oxide thin film post-processing method based on multi-stage cooling annealing, and aims to actively regulate and control thin film stress while repairing oxygen vacancies through a precisely designed heat treatment process. According to the method, the problem that stress control and defect repair are difficult to consider in the annealing process is solved, and a solid theoretical basis and scientific basis are laid for preparing low-absorption and high-stability oxide intense laser thin film devices.

The invention provides an oxygen vacancy defect carbon nitride anchored iron atom cluster catalyst and a preparation method and application thereof, and belongs to the technical field of catalysts. Iron atoms are anchored in a carbon nitride (Ov-C3N4) structure containing oxygen vacancy defects in a cluster form, and Fe-Ov-C defect bonds are formed between the oxygen vacancy defects in C3N4 and iron atom clusters to stabilize the iron atom clusters, so that the problem of thermodynamic instability of the catalyst is solved while higher atom utilization efficiency is obtained; the Fe-Ov-C defect bond atoms can reasonably regulate and control the electronic structure of the center of an iron cluster d band, so that the catalytic activity and the cycling stability are greatly enhanced; besides, iron atom clusters and persulfate act to cause O-O bond breakage, non-free radical singlet oxygen is formed, and the problem that the catalytic efficiency is sharply reduced due to free radical annihilation in a complex water environment can be effectively solved.

The invention belongs to the technical field of catalytic materials, particularly relates to an electrocatalytic anode oxygen evolution reaction catalyst based on an anion exchange membrane electrolytic cell, and particularly relates to a high-entropy oxide electrocatalyst and a preparation method thereof. The high-entropy oxide electrocatalyst is composed of five metal elements of Ni, Co, Fe, Mn and Al, is loaded on a foamed nickel substrate, has a nanosheet structure, is rich in oxygen vacancies on the surface, has excellent electrochemical catalysis performance and stability, and is suitable for electrocatalysis of an electrolytic water anode side in an alkaline environment. According to the preparation method of the high-entropy oxide electrocatalyst, foamed nickel is used as a substrate, salts of five metals of Ni, Co, Fe, Mn and Al which are equal in mole are subjected to hydrothermal synthesis to form a precursor, and then the high-entropy oxide electrocatalyst is prepared through self-etching, annealing oxidation and acid etching, and the high-entropy oxide electrocatalyst is easy and convenient to operate, good in repeatability, controllable in cost, excellent in performance and suitable for large-scale production.

The invention provides a heterojunction-based multi-mode photoelectric synapse device and a preparation method thereof. The heterojunction-based multi-mode photoelectric synapse device comprises a bottom electrode, a memristive functional layer, a photosensitive layer and a top electrode which are stacked in sequence, the memristive functional layer comprises metal oxide rich in oxygen vacancies and is provided with a micro-nano structure surface; the photosensitive layer covers the surface of the micro-nano structure of the memristive function layer, and forms a heterojunction interface with the memristive function layer; the oxygen vacancies and the heterojunction interface act synergistically, so that the device can respond to changes of optical signals, ambient temperature and ambient oxygen partial pressure at the same time, and the optical pulse intensity and the optical response current generated by the device have a non-linear relationship. Through cooperative regulation and control of an oxygen vacancy and a heterojunction interface, the device can respond to changes of an optical signal, environment temperature and environment oxygen partial pressure at the same time, a non-linear relation exists between optical pulse intensity and optical response current generated by the device, and then the function of integrating multi-mode sensing and sensing storage calculation is achieved.

The invention provides a surface modification method for a lithium-rich manganese-based positive electrode material, which comprises the following steps of: washing by using a peroxide-containing aqueous solution, properly increasing the washing temperature (preferably 40-80 DEG C), regulating the reaction pH value to 1-7, accurately controlling the ratio of acidity to free radical oxidation reaction, and optimizing the interface stability, oxygen vacancy density and Li < + > diffusion rate, thereby obtaining the lithium-rich manganese-based positive electrode material. Meanwhile, the dosage of peroxide (preferably persulfate) is reduced, the reaction time is shortened, the modification efficiency is improved, the raw material consumption is reduced, and the production cost is reduced.

A modified lithium-rich manganese-based positive electrode material, and a preparation method therefor and the use thereof. The modified lithium-rich manganese-based positive electrode material comprises a lithium-rich manganese-based positive electrode material, wherein the bulk phase of the lithium-rich manganese-based positive electrode material is doped with a high-valent transition metal element, and the surface phase of the lithium-rich manganese-based positive electrode material has a lithium metal compound coating layer and an oxygen vacancy. In the modified lithium-rich manganese-based positive electrode material, the doping with a bulk-phase high-valence transition metal element, the coating with a surface-phase lithium metal compound coating layer and the construction of an oxygen vacancy are conducted at the same time; and by means of the co-action of the three, the rate capability and the cycling performance of the lithium-rich manganese-based positive electrode material can be significantly improved, which is of great significance for the further commercialization of the lithium-rich manganese-based positive electrode material.

A vertical channel oxide semiconductor field effect transistor and a manufacturing method, relating to the technical field of information materials and devices. In the oxide semiconductor field effect transistor, a trench-shaped oxide semiconductor channel layer is used, the trench is then filled with an oxide semiconductor material, and an oxygen vacancy concentration of a material of an oxide semiconductor filling layer is less than an oxygen vacancy concentration of a material of the oxide semiconductor channel layer; and by using an oxide semiconductor having a low carrier concentration as an internal filling material, a threshold regulation capability of the vertical channel oxide semiconductor field effect transistor can be effectively improved, and the impacts of interface damage and unnecessary doping can be avoided, thereby achieving a vertical channel oxide semiconductor field effect transistor of which a threshold can be accurately regulated.

The invention discloses a preparation method and application of samarium-doped lanthanum ferrite nanofibers, and the preparation method is a design thought based on synergistic interaction of'defect engineering 'and'morphology control': samarium (Sm) ions with a specific proportion are creatively introduced to the A site of LaFeO3, and lattice distortion is induced by utilizing radius mismatch between the samarium (Sm) ions and lanthanum (La) ions; therefore, high-concentration gas-sensitive active sites (oxygen vacancies) are generated in the intrinsic structure of the material; and the material is constructed into a one-dimensional nanofiber network with a high specific surface area through an electrostatic spinning technology, so that the exposure efficiency of active sites is maximized.

The present disclosure relates a high entropy oxide and preparation method thereof. Specifically, the present disclosure provides a high entropy oxide of formula (FeNiCrMnMgCu)O including spinel structure, and the spinel structure includes oxygen vacancy (OV) concentration of 20 to 40%. The present disclosure further provides a photodetector, which includes a substrate, an absorbing layer comprising the high entropy oxide, and an electrode unit. With the plenty of oxygen vacancies, the high entropy oxide shows the excellent optical absorption properties, thereby having a bright prospect of the application.

The application discloses a preformed methane reforming catalyst and a preparation method thereof. The catalyst comprises a nickel-active alumina first functional component, a cerium oxide nanocluster second functional component and an alumina inert phase. The preparation method comprises preforming an inert phase pretreatment, hydrothermal treatment, calcination and reduction. The preformed inert phase after pretreatment is used as a carrier, which greatly improves the catalyst strength, pertinently weakens the metal-carrier interaction, avoids bed layer temperature drop and carbon deposition caused by local high strength reaction, and improves the operation stability. The first functional component with a layered structure and the second functional component rich in oxygen vacancies further improve the catalyst activity and stability, and the performance indicators are overall superior to those of the existing catalyst products. The preparation method is simple and easy to implement, has no special requirements on equipment, and is conducive to the popularization and application in the fields of methane steam reforming and methane dry reforming.

The invention discloses a Ce-MOF derived multi-metal oxide / ZSM-5-based composite catalyst as well as a preparation method and application thereof, and belongs to the technical field of aviation kerosene preparation. The H-ZSM-5 molecular sieve is synthesized by adopting a hydrothermal method, and Ce-MOF is grown on the surface of the H-ZSM-5 molecular sieve in situ. The high specific surface area, developed pore structure and abundant unsaturated sites of the Ce-MOF material are utilized to realize efficient loading of various active metals. And drying and calcining to obtain the Ce-MOF derived multi-metal oxide / ZSM-5 composite catalyst with a stable structure. Rich oxygen vacancies and active sites can efficiently activate CO2 molecules and promote the hydrogenation process of the CO2 molecules and H2 to generate a key methanol intermediate; accurate carbon chain growth regulation coupling effect can be performed on the methanol intermediate, and the methanol intermediate is quickly and effectively converted. The catalyst prepared by the method provided by the invention has a regular pore structure and suitable acidic sites, and on the basis of the cage control shape selective catalysis principle of the H-ZSM-5 molecular sieve, the per-pass conversion rate of CO2 exceeds 25%, the selectivity of aviation kerosene components in hydrocarbon products reaches 70.5%, and the generation of methane by-products is effectively inhibited.

The invention relates to a PEM ternary alloy catalyst for water electrolysis hydrogen production and a preparation method thereof, and belongs to the technical field of water electrolysis catalysts. 1-butyl-3-methylimidazolium tetrafluoroborate is introduced in the generation of a carrier manganese dioxide to increase the specific surface area of the carrier, fluorine doping and oxygen vacancy construction are realized on the surface of the carrier through hydrofluoric acid treatment, and then a metal precursor is dispersed through an ethylene glycol / water system; and finally, loading and alloying of the alloy nanoparticles are completed through hydrothermal reduction and heat treatment. The morphology and electronic structure of the carrier are synergistically regulated and controlled through ionic liquid and fluorine doping, the specific surface area and active sites are remarkably increased, strong interaction of metal and the carrier is achieved through ternary alloy component optimization, and the oxygen evolution reaction activity and stability of the catalyst and the precious metal utilization rate are effectively improved.

The invention discloses an oxygen-enriched destressing crystal growth method and a crystal growth furnace, and relates to the technical field of crystal growth, and the oxygen-enriched destressing crystal growth method comprises the following steps: step 1, pre-treating a PMNT polycrystal material, and putting the pretreated PMNT polycrystal material into a crucible; 2, pre-flushing the growth furnace and creating an oxygen partial pressure environment; 3, raising the temperature in the growth furnace to melt and homogenize the PMNT polycrystal material in the crucible; step 4, the crucible moves downwards for directional solidification of the crystal, a solid-liquid interface is formed and stably moves upwards, and in the process, a dynamic regulation and control strategy is adopted in the growth furnace to control an oxygen-enriched environment to promote crystal growth, so that the crystal digests growth stress in the growth process, and formation of oxygen vacancies is inhibited; and step 5, after crystal growth is finished, gradient cooling is performed to room temperature in an oxygen-enriched environment, and a crystal ingot is obtained. Oxygen is used as a regulation and control tool, the stress problem caused by oxygen vacancy is physically solved, the color center and performance problems caused by oxygen vacancy are chemically solved, and the crystal growth quality is improved.

The invention relates to a memristor and a preparation method thereof. The preparation method comprises the following steps: providing an insulating substrate with a bottom electrode formed on the surface; depositing an aluminum oxide thin film on the bottom electrode by adopting electron beam evaporation under a room temperature condition to form a resistive function layer, and not performing high-temperature annealing treatment after deposition is completed, so that a primary oxygen vacancy defect is reserved in the thin film; and then depositing a top electrode on the resistive function layer through thermal evaporation or electron beam evaporation to obtain the memristor. The resistive function layer is an aluminum oxide film which is not densified through annealing, and internal defects of the resistive function layer provide a channel for metal ion migration, so that the reversible resistive characteristic is achieved. The memristor device is simple in structure and suitable for normal-temperature process preparation, the stable resistance switching behavior can be achieved, excessive densification of a film layer and thermal damage of an ITO electrode interface caused by high-temperature annealing are avoided, and the memristor has high cycle durability and nonvolatile data retention capacity and has the stable bipolar resistance change characteristic.

The invention provides an oxygen vacancy adjustable catalyst for synergistically removing nitrogen oxides and volatile organic compounds as well as a preparation method and application of the oxygen vacancy adjustable catalyst. The catalyst takes natural ore as a raw material, main active components are MnO2 and Fe2O3, and an inert component is mainly SiO2. The catalyst with different oxygen vacancy concentrations is obtained by regulating and controlling the ratio of the active components and the calcining atmosphere, and the catalyst has good catalytic performance of synergistically removing nitrogen oxides and volatile organic compounds. Under the conditions that the volume space velocity (24000 h <-1 >) is high, the concentration of NO and NH3 is 500 ppm, the concentration of toluene is 50 ppm and 5 vol.% O2 / N2, the conversion rate of NO is kept at 80% or above within the range of 90-260 DEG C, and the conversion rate of toluene reaches 50% at the temperature of 114 DEG C and reaches 90% at the temperature of 224 DEG C. The simple preparation method is utilized, ores are selected as active components, the catalyst with the adjustable oxygen vacancy is prepared, and the catalyst is suitable for collaborative purification of NOx and VOCs in flue gas in the industries of coal-fired power plants, cement, metallurgy and the like.

The invention discloses a copper-doped cerium oxide antifouling agent and a preparation method and application thereof.The antifouling agent takes cerium oxide as a main body material, copper is introduced for doping, Cu < 2 + > partially replaces Ce < 4 + > to enter crystal lattices, charge imbalance is caused, more oxygen vacancies are induced to be generated, meanwhile, reduction conversion from Ce < 4 + > to Ce < 3 + > is promoted, and formation of the oxygen vacancies is further stabilized. The oxygen vacancies obviously enhance the surface catalytic activity of the material, H2O2 and Br <-> in seawater can be efficiently catalyzed to generate hypobromous acid (HOBr) with a bactericidal effect, the function of natural halogenated peroxidase is simulated, and long-acting and environment-friendly biological antifouling is realized. The antifouling agent provided by the invention can be synthesized by adopting a hydrothermal method, is simple and convenient in process, is suitable for large-scale preparation, is suitable for various marine environment antifouling scenes such as hulls, marine engineering equipment and underwater sensors, and has a good application prospect.

The invention relates to the technical field of preparation of catalytic materials, in particular to a preparation method of a manganese dioxide room-temperature catalyst, which comprises the following steps: dissolving a manganese-containing soluble salt in deionized water to form a solution A; adding an oxidizing agent F into the solution A to form a mixed solution B; s3, carrying out hydrothermal reaction on the mixed solution B to obtain a reaction product; washing the reaction product for multiple times, centrifuging, precipitating and drying to obtain a sample; and calcining the sample to obtain the manganese dioxide catalyst. According to the preparation method of the manganese dioxide room-temperature catalyst, the manganese dioxide phase structure is accurately regulated and controlled, and the manganese dioxide synthesized by the method for regulating and controlling the phase structure has high specific surface area and rich oxygen vacancies; meanwhile, accumulation of intermediate products such as formic acid and CO is effectively inhibited through high-density distribution of defect sites, and the formaldehyde removal rate at the room temperature (25 DEG C) can reach 90% or above.

The invention relates to the technical field of visual sensing modules, and discloses a sensing-storage-calculation integrated bionic visual sensing module in-storage calculation method and system.The method comprises the steps that photo-induced electrons excited by incident photons are directly injected into memristor oxygen vacancy conductive filaments through a shared electrode interface, and photocurrent driving signals are obtained; in a forward SET mode, driving memristor oxygen vacancy conductive filaments to form cross array conductivity distribution, and calculating row line driving voltage of a memristor cross array; applying the current to each cross point of cross array conductance distribution in a reverse RESET mode to obtain a flowing current of each cross point; and converging and summing the flowing current of each cross point at a column line node to obtain a column line output current, performing capacitor charging integration on the column line output current, and converting the column line output current into an analog domain convolution operation voltage, thereby avoiding intermediate multiple analog-to-digital and digital-to-analog conversion loss. And end-to-end low-delay and low-power-consumption processing from photon sensing to feature calculation is realized.

The invention discloses a coal mine return air corner CO purification method based on catalytic oxidation, and relates to the technical field of coal mine return air corner CO purification, the coal mine return air corner CO purification method comprises the following steps: mixing manganese salt, cerium salt and a complexing agent by adopting a sol-gel coprecipitation method, stirring to form sol, and sequentially drying and calcining at high temperature to prepare a Mn-Ce-O composite oxide catalyst precursor; loading the Mn-Ce-O composite oxide catalyst precursor on a mesoporous carbon carrier subjected to hydrophobic modification treatment through an impregnation method, and carrying out drying and inert atmosphere heat treatment to obtain the low-temperature adaptive composite catalyst with an oxygen vacancy structure and moisture resistance, forming the low-temperature adaptive composite catalyst into a regular structure unit, filling the regular structure unit into a front end area of a reactor to form a first catalyst layer, filling a downstream area of the reactor with a thermal stability catalyst to form a second catalyst layer, and forming a catalytic reaction structure with an activity gradient along an airflow direction; the catalytic reaction structure with the activity gradient is integrated in a modular shell.

The invention relates to the technical field of fuel cell new materials and new energy, in particular to an A-site high-entropy perovskite cathode material and a preparation method thereof. According to the technical scheme, the material comprises the following raw materials: Pr (NO3) 3.6 H2O, La (NO3) 3.6 H2O, Co (NO3) 2.6 H2O, CaCO3, BaCO3, SrCO3 and citric acid. The molar ratio of the praseodymium ions to the lanthanum ions to the cobalt ions to the calcium ions to the barium ions to the strontium ions to the citric acid is 1: (1-2). According to the invention, the A site of the perovskite material is doped with a plurality of elements, a rapid quenching preparation process is combined, the oxygen vacancy concentration and the proton conduction path can be optimized, the ORR activity and the conductivity can be improved, and excellent electrochemical performance and thermal stability can be shown through the synergistic effect of the plurality of elements and structural regulation and control, so that the performance of the cell can be improved.

The invention discloses a difunctional composite lithium supplement additive and a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The bifunctional composite lithium supplement additive provided by the invention comprises lithium-rich lithium ferrite as a core layer and a lanthanum gallate coating layer coating the outer surface of the core layer. The lithium supplementing additive prepared by the invention realizes dual inhibition on released high-active oxygen species, the released O2 is captured and fixed in the coating layer through oxygen vacancy adsorption and lattice constraint, and a physical barrier is synchronously formed in the coating layer in a deep lithium removal process to block a migration channel of active oxygen to an electrolyte, so that the lithium supplementing effect is improved. Therefore, the cycling stability of the lithium ion battery is greatly improved, the service life of the lithium ion battery is greatly prolonged, and the application prospect in the lithium ion battery is wide.

The present invention relates to the technical field of photocatalysts, and in particular to a microspherical TiO2-x / C / FeMn-LDHS / g-C3N4 composite photo-Fenton catalyst, and a preparation method therefor and a use thereof. The preparation method in the present invention is simple and the process is controllable. The prepared microspherical TiO2-x / C / FeMn-LDHS / g-C3N4 material has the advantages of combined spherical structure and layered structure, heterojunction, carbon layer protection, and stabilized oxygen vacancies while retaining the redox properties of TiO2, improves the conversion efficiency of photo-generated electrons, has high catalytic performance and a stable structure, and when used as a photo-Fenton catalyst, has important applications in the field of efficient removal of ammonia nitrogen and lipophilic antibiotics in water.

The invention discloses a bismuth oxyiodide modified oxygen-vacancy-enriched titanium dioxide nanotube array and a preparation method and application thereof, which realize wide-range and efficient light response efficiency: BiOI (forbidden bandwidth is approximately equal to 1.8 eV) is used as an excellent visible-light-driven photocatalyst and forms a semiconductor heterojunction with TNAs after being loaded, the spectral response range of the material is widened to a visible light wave band, and the visible-light-driven visible-light-driven photocatalyst can be used for preparing a visible-light-driven photocatalyst. And the construction of interface oxygen vacancies also improves the transmission efficiency of photon-generated carriers, so that the photocatalytic efficiency and the visible light utilization rate of the material are greatly improved. The material prepared by the invention can be used for a long time after being fixed in a reactor, and after the material is recycled for 20 times, the degradation rate of typical refractory organic matters in single 60 minutes can still be kept above 90%.

The invention belongs to the technical field of solid oxide batteries, and relates to a doped biphase oxygen electrode material based on in-situ reconstruction and a preparation method and application thereof. The doping type biphase oxygen electrode material based on in-situ reconstruction is a perovskite type oxide, and the chemical formula is PrBaCo < 2-x-y-z > M < 1 > < x > Y < z > M < 2 > < y > O < 5 + delta >, in the formula, M1 is any one of Zr, Hf and Ti, M2 is any one of Nb, Mo, Ta and V, x is greater than or equal to 0.05 and less than or equal to 0.15, y is greater than or equal to 0.05 and less than or equal to 0.15, z is greater than or equal to 0.05 and less than or equal to 0.2, and delta represents a non-stoichiometric oxygen vacancy. The doped oxygen electrode material with a biphase structure is prepared by co-doping M1, M2 and Y according to a specific proportion to partially replace Co at the position B, and the oxygen electrode material has a relatively low thermal expansion coefficient and is well matched with an electrolyte BCZYYb. The oxygen electrode material has good electrochemical performance and excellent long-term working stability.

This invention proposes a photocatalytic material based on Bi2O2S, its preparation method, and its application. The Bi2O2S-based photocatalytic material comprises Bi2O2S, oxygen vacancies introduced onto the Bi2O2S, and an S-type heterojunction constructed on the Bi2O2S. The Bi2O2S-based photocatalytic material is O... V -Bi2O2S / Bi4O5I2 composite photocatalytic material; the O V The preparation method of the -Bi2O2S / Bi4O5I2 composite photocatalyst material includes: Step 1) preparing O V -Bi2O2S catalyst; Step 2) Preparation of O V -Bi2O2S / Bi4O5I2 composite photocatalytic material; the O V The Bi2O2S / Bi4O5I2 composite photocatalytic material is suitable for hydrogen peroxide synthesis; this invention is a novel composite photocatalytic material with a novel structure and excellent performance.

The invention belongs to the technical field of reverse osmosis membranes, and relates to a visible-light-responsive carbon nitride / zinc oxide heterojunction modified reverse osmosis membrane and a preparation method thereof.The method specifically comprises the steps that porous ultrathin carbon nitride nanosheets are prepared; synthesizing zinc oxide nanoparticles rich in oxygen vacancies; and compounding the two to form the Z-type heterojunction photocatalyst. The heterojunction is stably loaded in a polyamide separation layer through an interfacial polymerization process, the composite reverse osmosis membrane is prepared, and the membrane disclosed by the invention has a remarkable visible light response characteristic while maintaining a high desalination rate. The method has the core advantages that the visible light utilization rate and the photo-generated charge separation efficiency are remarkably improved through the construction of the heterojunction, so that the membrane can actively and efficiently degrade organic pollutants under illumination, self-cleaning is realized, the anti-pollution capacity is greatly improved, and the chemical cleaning period is greatly prolonged.

The invention relates to a flower-like MOFs-derived Mn-based composite oxide catalyst as well as a preparation method and application thereof.The flower-like MOFs-derived Mn-based composite oxide catalyst is prepared by taking Mn-based organic frameworks (MOFs) prepared by stirring at normal temperature as a precursor, forming flower-like MOFs by regulating and controlling self-assembly conditions, and cracking the MOFs by a three-section high-temperature pyrolysis method to obtain a dandelion-like Mn-based metal oxide. The oxide has a larger specific surface area and abundant active sites. The preparation method has the advantages that the MOFs skeleton structure obtained by stirring at normal temperature is used as an oxide precursor, more oxygen vacancies can be introduced by utilizing a three-section calcination method, the morphology of MOFs can be maintained, the specific surface area is high, more surface active sites are exposed, the oxidation-reduction performance is improved, and the preparation method is simple and convenient to operate. The bimetallic composite oxide is ensured to have more efficient and stable toluene removal performance at low temperature, and the catalyst is environment-friendly and has a wide industrial prospect.

The invention discloses an electrochemical luminescence immunosensor for detecting interleukin-1 beta as well as a preparation method and application of the electrochemical luminescence immunosensor. The electrochemical luminescence immunosensor comprises a three-electrode system consisting of a working electrode, a reference electrode and a counter electrode, the working electrode is a modified electrode of CoAl layered double hydroxides, the modified electrode is subjected to alkali etching and then loaded with platinum nanoparticles, then an interleukin-1 beta antibody is fixed, and non-specific sites are closed, so that the working electrode is obtained; when the immunosensor is used for detection, a solution containing luminol is used as an electrolyte. The working electrode of the immunosensor takes oxygen vacancy-rich CoAl layered double hydroxide as a substrate, platinum nanoparticles are combined to realize an EMSI effect, an electrochemical luminescence signal of a luminol-dissolved oxygen system is remarkably enhanced, and antigen-antibody specific recognition is combined to realize quantitative detection of IL-1beta. The method has the characteristics of strong anti-interference capability, high detection speed and good stability.