52results about How to "Facilitates electron transfer" patented technology

The invention relates to a bioelectrochemical sensor used for detecting hydrogen peroxide and a manufacturing method of the bioelectrochemical sensor. The novel bioelectrochemical sensor is a sensor with a three-electrode system, wherein the counter electrode is a platinum electrode, the reference electrode is saturated calomel electrode and the working electrode is gold electrode. The sensor is based on orientation combination of a polypeptide horse radish peroxidase with characteristic sequence, the promotion effect of the polypeptide horse radish peroxidase on the activity of the enzyme and the characteristic of high sensitivity of electrochemical detection methods. The sensitivity of hydrogen peroxide sensors is effectively improved and satisfactory results are obtained.

The invention relates to the technical field of preparation of VOCs catalytic oxidation catalysts, in particular to a reticular spherical B-MnO2 catalyst based on a B-Ov-Mn active center and a preparation method and application of the reticular spherical B-MnO2 catalyst. The B-MnO2 catalyst is prepared from delta-MnO2 serving as a basic component, a B-O-Mn structure formed by doping B into the delta-MnO2, and an asymmetric oxygen vacancy B-Ov-Mn active center formed on the basis of the B-O-Mn structure, compared with the existing MnO2 catalyst, the B-MnO2 catalyst prepared by the preparation method disclosed by the invention is formed by connecting a plurality of nanosheets to form a net-shaped ball, so that the B-MnO2 catalyst has a high specific surface area; moreover, by constructing an asymmetric oxygen vacancy B-Ov-Mn active center, the catalyst can effectively promote the adsorption and activation of H2O and enhance the electron transfer between H2O molecules and the catalyst, so that water vapor contained in actually discharged VOCs waste gas and water vapor contained in the environment can be quickly converted into active hydroxyl groups and participate in catalytic oxidation reaction, and the catalytic oxidation effect is improved. Therefore, the inhibition effect of H2O molecules in a traditional MnO2 catalyst is converted into the promotion effect, and the MnO2 catalyst has good market competitiveness.

The invention belongs to the technical field of NH3 catalytic oxidation catalysts, and particularly relates to a preparation method and application of a surface defect-rich catalyst for NH3 catalytic oxidation, and the preparation method comprises the following steps: (1) mixing heteropolyacid, a molecular sieve and deionized water, grinding, carrying out vacuum drying, and calcining in an inert atmosphere to obtain catalyst carrier powder; (2) weighing a manganese precursor salt and an auxiliary agent precursor salt, dissolving the manganese precursor salt and the auxiliary agent precursor salt in water to prepare an aqueous solution, adding the catalyst carrier into the aqueous solution of the manganese precursor salt and the auxiliary agent precursor salt, carrying out vacuum drying, and calcining in an inert atmosphere to obtain a supported catalyst; and (3) reducing the supported catalyst in a mixed reducing atmosphere containing CO / inert gas to obtain the catalyst with rich surface defects. According to the method disclosed by the invention, rich defect sites can be constructed on the surface of the catalyst, the NH3 catalytic oxidation activity of the catalyst under a wide temperature window is promoted, and meanwhile, the N2 selectivity is improved.

The invention belongs to the technical field of electrochemical engineering, and relates to a three-dimensional electrochemical reactor which comprises a reactor shell assembly, three-dimensional electrode modules, counter electrode modules, diaphragms or polymer partition plates and an external power supply, the counter electrode modules are arranged in pairs, and the three-dimensional electrode modules are clamped between the counter electrode modules arranged in pairs; the diaphragm or the polymer partition plate is clamped between the electrode surface of the counter electrode module and the electrode surface of the three-dimensional electrode module, and the three-dimensional electrode module, the counter electrode module and the diaphragm or the polymer partition plate are arranged in an inner cavity of the reactor shell assembly; according to the invention, the fluid can flow through the interior and surface of the three-dimensional electrode, and a main electrochemical reaction field is transferred to the interior and surface of the three-dimensional electrode, so that the sufficient flow and mixing of the fluid between the electrodes are ensured while the electrode spacing is shortened as far as possible, the solution resistance is reduced, the cell voltage is reduced, and the current efficiency is improved; and energy consumption increase and equipment damage caused by overhigh voltage are avoided.

The invention discloses a self-supporting carbon electrode based on a wood-bamboo material, a preparation method of the self-supporting carbon electrode and application of the self-supporting carbon electrode in manufacturing of a supercapacitor electrode. The preparation method comprises the following steps: (1) fully carbonizing wood and bamboo chips with through pores in an inert atmosphere to obtain wood and bamboo carbon chips; (2) soaking foamed nickel in a solution containing cobalt acetate and nickel acetate, then taking out and airing, wrapping the wood-bamboo carbon sheet, and extruding the foamed nickel under the pressure of 5-15kN / m < 2 > to enable the foamed nickel to be in full contact with all the surfaces of the wood-bamboo carbon sheet; and (3) fixing the foamed nickel-coated wood-bamboo-carbon sheet obtained in the step (2) on a first conductive support as a working electrode, placing the working electrode, a counter electrode and a reference electrode in a molten salt electrolyte in an inert atmosphere for electrolysis, applying a voltage of-2.1 to-2.3 V to the working electrode, carrying out electrolysis for 8-12 hours to realize pore forming and graphitization, and after the electrolysis is completed, taking out the foamed nickel-coated wood-bamboo-carbon sheet. And taking out the wood-bamboo carbon sheet sample from the foamed nickel, washing and drying to obtain the self-supporting carbon electrode.

The invention provides a layered lattice iron bifunctional catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a layered structure material with deionized water to obtain slurry, adding the slurry into a nucleation reactor, violently stirring, and circularly stirring for multiple times; then collecting the slurry, centrifuging, and carrying out vacuum drying on the obtained solid material to obtain a purified material; and calcining the obtained material at high temperature for structural evolution to obtain the layered lattice iron bifunctional catalyst. The layered lattice iron bifunctional catalyst provided by the invention has a unique pore structure, a large specific surface area and wide pore distribution, effectively adsorbs and enriches organic pollutants in water, provides driving force for Fenton oxidative degradation of low-concentration organic pollutants, and improves the Fenton oxidative degradation efficiency; the layered lattice Fe exists in the catalyst in the form of an aluminum-oxygen-iron covalent bond, the Fe stability is improved, the Fe dissolution amount is extremely low in the oxidative degradation process, no iron mud is generated, and continuous removal reaction and recycling of the catalyst are facilitated.

The invention belongs to the technical field of electrochemistry, and particularly relates to an alloy-loaded conductive aerogel catalyst as well as a preparation method and application thereof. The alloy-loaded conductive aerogel catalyst comprises a substrate and noble metal loaded on the substrate, the substrate adopts conductive aerogel, the loading mass ratio of the noble metal on the substrate is 1-20%, the noble metal comprises noble metal A and noble metal B, and the molar ratio of the noble metal A to the noble metal B is (1-9): 1; the precious metal A is Ir, and the precious metal B comprises one or more of Ru, Pt and Rh. According to the electrolyzed water anode catalyst, noble metal is impregnated and loaded by utilizing a porous structure of aerogel, the noble metal with extremely low content is loaded by utilizing the structural characteristics of the aerogel, meanwhile, an extremely strong dispersion effect is achieved, the catalyst is obtained by combining a sol-gel method and a calcination method, and the advantages of low overpotential, high catalytic activity, low cost and the like are achieved; and the market prospect is wide.

The invention belongs to the technical field of electrode materials, and particularly relates to a ZIF-derived CoZnS electrode material and a preparation method and application thereof. According to the preparation method, soluble cobalt salt and soluble zinc salt are taken as raw materials, NH4F is taken as a buffering agent and a structure-directing agent, urea is adopted to provide a weak base environment, a solvothermal reaction is adopted to prepare a foamed nickel-CoZn precursor, then coordination with the foamed nickel-CoZn precursor is carried out under the coordination effect of dimethylimidazole, conversion is carried out to ZIF, then a ZIF-67 structure is introduced, and the composite material is prepared. A ZIF-derived precursor is obtained, the vulcanization condition of the ZIF-derived precursor is controlled, and the ZIF-derived CoZnS electrode material is prepared. The ZIF-derived CoZnS electrode material has a uniform MOF structure and a three-dimensional array, provides sufficient active sites and a stable physical structure for a subsequent electro-catalytic hydrogen evolution reaction, and overcomes the technical defect of low catalytic site density in the prior art.

This invention relates to the field of industrial wastewater treatment technology, and discloses an electrocatalytic oxidation device and its operating method for treating saline industrial organic wastewater. Wastewater enters the reaction chamber through the bottom inlet, is forced through the anode channels, and undergoes an electrochemical oxidation reaction on the anode surface to convert chloride ions into hypochlorous acid. A vacuum ultraviolet light source performs in-situ photolysis of water molecules and hypochlorous acid, exciting various active species, including strongly reducing hydrated electrons, strongly oxidizing hydroxyl radicals, and chloride radicals. This device, through the construction of a reduction-oxidation system, can efficiently degrade various pollutants with both electron-rich and electron-deficient characteristics. This invention utilizes the synergistic coupling of electrochemical generation and photochemical conversion to convert high-concentration chloride ions into active precursors, effectively overcoming the bottlenecks of low degradation efficiency and poor selectivity in traditional technologies for high-salt and complex water quality, and significantly improving the system's mineralization efficiency and energy utilization rate.

A method and application of CO2 laser-induced synthesis of jujube-shaped heterostructure electrocatalysts, after mixing a sulfur source and distilled water, adding a cobalt source, sodium citrate and a tin source, stirring evenly, the sulfur source is L-cysteine, ammonium thiocyanate, thiourea or sulfur powder, the cobalt source is hexahydrated cobalt nitrate, cobalt chloride and cobalt acetylacetonate, the tin source is stannous chloride, tin tetrachloride or stannous sulfate, hydrothermally reacting in a stainless steel autoclave, washing, centrifuging, vacuum drying at room temperature, obtaining an electrocatalyst precursor; grinding the electrocatalyst precursor into powder, evenly paving, and inducing CO2 laser in an air atmosphere; cooling to room temperature, washing, drying and grinding into powder to obtain a jujube-shaped heterostructure CoS / SnO2@C electrocatalyst. Advantages: simple synthesis, short time consumption, low energy consumption, good dispersibility, excellent ORR and OER electrocatalytic performance, can be used to prepare cathode electrocatalysts for lithium oxygen batteries.

The present invention discloses a device and a method for efficiently treating liquid manure of livestock and poultry based on a CSTR integrated reactor. The device provided by the present invention includes a reactor, a feeding system and a discharging system; the reactor includes a stirring device, the stirring device includes a vertical stirring shaft and a horizontal stirring rod, the two form an angle and are a hollow structure; a spiral belt stirring paddle is provided at the end of the horizontal stirring rod; the feeding system is provided with a feeding pipeline and a flushing pipeline; the discharging system is provided with a sand flushing pipeline and a water outlet pipeline. The present invention uses a stirring device to flush the material into the middle of the tank under stirring, which helps to mix it fully. At the same time, the flushing pipeline and the sand flushing pipeline are used to solve the defects of upper layer compaction and bottom layer sand deposition in the tank, thereby improving the efficiency of anaerobic digestion and methane production of liquid manure of livestock and poultry.

Host-guest supramolecular probes and applications for accelerating nitroreductase detection belong to the fields of organometallic supramolecular, bioinorganic and biofluorescent probes. The supramolecular host-guest probe platform, which is assembled based on the metal organic cage main structure constructed based on the cofactor structure and the nitroreductase small molecule fluorescent probe, can be used for the rapid quantitative detection of nitroreductase in tumors, simplifying the enzyme-catalyzed double substrate process to a single substrate process. The traditional fluorescent sensor that depends on the cofactor concentration is no longer interfered by the cofactor, and has a rapid fluorescent signal response to the detection of the target enzyme. There is a linear relationship between the fluorescence emission change of the host-guest probe and the nitroreductase concentration, and compared with the simple small molecule probe, the host-guest probe shows better sensitivity to the target enzyme. This host-guest supramolecular fusion strategy provides an effective tool for the new rapid quantitative detection of nitroreductase and provides a new method for biological tracing.

The invention relates to a ruthenium-based catalyst as well as a preparation method and application thereof. The ruthenium-based catalyst comprises a modified carrier and ruthenium loaded in the modified carrier, wherein the modified carrier is titanium dioxide loaded with noble metal components; the preparation method comprises the following steps: dipping a carrier in a solution containing a noble metal component to obtain a dipped carrier; carrying out first drying and first roasting on the impregnated carrier to obtain a modified carrier; preparing a suspension containing the modified carrier, and adding a ruthenium precursor salt and a reducing agent into the suspension for dipping to obtain a mixed material; and after centrifuging the mixed material, carrying out washing treatment, secondary drying and secondary roasting. The modified carrier can effectively regulate and control oxygen vacancies and the content of trivalent titanium in the carrier, so that the electron transfer process between the carrier and metal is promoted, the ruthenium element is further loaded in the modified carrier, and the improvement of the Fischer-Tropsch synthesis activity and the target product selectivity can be effectively promoted.

The present application relates to the application of open-cage borane compounds in the preparation of immunosuppressants, belonging to the technical field of biological medicine. The open-cage borane compounds of the present application include nest borane compounds and / or spider web borane compounds, and the pharmaceutically acceptable solvates or pharmaceutically acceptable complexes of the nest borane compounds and the spider web borane compounds. The open-cage boron clusters of the present application have dehydrogenase-like activity, can catalyze the dehydrogenation reaction of hydroxyl-containing organic substrates in a biological system, promote the conversion of NAD(P) + to NAD(P)H, further improve the intracellular oxidation-reduction ratio, induce cell redox stress, and further reshape the metabolic pattern of HSCs from the source, promote the differentiation of immune cells to immunosuppressive phenotype, and play an immunosuppressive role.

The present invention relates to the field of anaerobic digestion, and specifically to a method for preparing magnetic biochar for immobilizing ammonia nitrogen-tolerant anaerobic microorganisms and a method for alleviating ammonia nitrogen inhibition. The present invention first domesticates anaerobic microorganisms with high tolerance to ammonia nitrogen under ammonia stress conditions, and the microbial structure and function are more complete, the adaptability is strong, and the microorganisms have general tolerance to high ammonia nitrogen systems. Then, the microorganisms with high tolerance to ammonia nitrogen are immobilized on magnetic biochar materials to construct a microhabitat system rich in ammonia nitrogen-tolerant anaerobic microorganisms, thereby ensuring efficient anaerobic digestion under high ammonia nitrogen conditions.

The present invention provides a bioelectrochemical system and method for enhancing plastic degradation. The method of the present invention utilizes a bioelectrochemical system to couple electroactive plastic degrading bacteria to enhance the degradation of plastics in the environment. The device is composed of an anode system and a cathode system. The electroactive plastic degrading bacteria and the plastic are both located in the anode system and the cathode system. The anode system is placed in a sedimentary layer in an actual environment, and the cathode system floats on the water surface. The two are connected by wires and resistors and fixed with a barrel. The electroactive plastic degrading bacteria can not only degrade plastics, but also provide electrons to the bioelectrochemical system, promote electron transfer in the bioelectrochemical system, and further accelerate the degradation of plastics. Under the dual strengthening effects of the bioelectrochemical system and the electroactive plastic degrading bacteria, the method realizes the enhanced degradation of plastics. The method has low cost and low energy consumption. It can also recycle electrical energy while accelerating the restoration of the water environment, and has good economic benefits and application prospects.

The invention discloses a nickel-copper diatomic catalyst and application thereof, the nickel element and the copper element in the nickel-copper diatomic catalyst are dispersed in a catalyst skeleton in an atomic scale, and the catalyst skeleton forms a metal organic framework with metal ions and organic ligands. The nickel-copper diatomic catalyst shows excellent catalytic performance in the application of preparing carbon monoxide through carbon dioxide electrocatalytic reduction, and has huge commercial application potential.

The invention provides a preparation method of an integrated platinum group metal gas diffusion catalyst layer, which comprises the following steps: (1) mixing a zinc-based organic metal framework, polyacrylonitrile and N, N-dimethylformamide to obtain an electrostatic spinning precursor solution; (2) spinning the electrostatic spinning precursor solution by using an electrostatic spinning machine, and collecting to obtain a Zn-MOF fiber layer; (3) the Zn-MOF fiber layer is placed in inert gas for high-temperature carbonization, the carbonization temperature is 700-1000 DEG C, and a Zn-containing N-doped carbon fiber layer is obtained; and (4) dipping the Zn-containing N-doped carbon fiber layer in a platinum group metal salt solution at 20-60 DEG C for 2-24 hours, taking out and drying to obtain the platinum group metal gas diffusion catalyst layer. According to the invention, a catalytic layer (CL) and a gas diffusion layer (GDL) are combined into a whole, and adjustment of a multi-stage pore channel is realized.

The invention relates to the technical field of agriculture, in particular to a method for fusing anaerobic fermentation compost, which comprises the following steps: mixing organic waste raw materials, and adding sodium citrate and magnesium sulfate for treatment; feeding the treated raw materials into an anaerobic reactor, adding an iron-based core-shell structure material, controlling the pH value of the system, and carrying out anaerobic fermentation to obtain digestion residues; bicarbonate and sodium citrate are added into the digestion residues to be mixed; and entering an aerobic composting stage, controlling the moisture content of the pile body under an oxygen supply condition, heating the pile body, maintaining the pile body to enter a decomposition stage, and carrying out natural aging to produce a decomposed organic fertilizer. In the invention, by virtue of the porous structure and surface characteristics of the iron-based core-shell structure material, not only is the stability of the fermentation process ensured, but also the microbial electron transfer process is optimized, and the methane production efficiency is improved; the compound microbial agent effectively increases the number of effective microbial communities, improves the temperature and ventilation conditions in the composting process, and ensures uniform decomposition of the organic wastes.

The invention belongs to the technical field of electrochemistry and chemical engineering, and particularly relates to a preparation method of nicotinamide adenine dinucleotide. The nicotinamide adenine dinucleotide can be efficiently prepared at a high yield under a low negative voltage by constructing a reaction system and utilizing cooperation between an electrode material and an electrochemical potential. The composite metal electrode is prepared by calcining metal and carbon, so that the yield of nicotinamide adenine dinucleotide is increased. By selecting the foam metal, diffusion and adsorption of NAD * and H * in the electrode material are facilitated, and more active sites are provided for charge transfer. According to the application, the carbon nanoparticles are introduced into the reaction liquid, and more active sites are provided to improve the electron transfer efficiency, so that the yield of nicotinamide adenine dinucleotide is further improved. Tests show that titanium foam metal is used as a working electrode, carbon nanoparticles are added into a reaction solution, and the yield is up to 99.3% after the reaction is carried out for 5s under the low negative voltage of-0.7 V.

The utility model relates to a multi-stage ecological interception ditch for agricultural non-point source pollution prevention and control, which is suitable for agricultural non-point source pollution prevention and control. Comprising a ditch body, ecological protection slopes are arranged on the two sides of the ditch body, slope plants are arranged on the slopes of the ecological protection slopes, a plurality of interception dams are distributed in the ditch body in a staggered mode to form a snakelike overflowing channel, the upstream side of each interception dam is provided with a slag blocking net, the upper edge of each slag blocking net is higher than the water surface, and the area between every two adjacent interception dams is a purification area. By arranging multiple stages of interception units, the retention time of a water body is greatly prolonged, so that the sewage treatment and purification efficiency is further improved. Through multiple effects of physics and microorganisms, the filtering and conversion performance of the ecological interception ditch on nitrogen and phosphorus in water is improved, and then the purification effect of the ecological ditch is integrally improved.

This invention provides a permeable reactive wall process and its application for simultaneously removing hexavalent uranium and sulfate from groundwater. The permeable reactive wall process consists of a first treatment unit and a second treatment unit arranged sequentially along the water flow direction. The first treatment unit is filled with a first reaction medium, including zero-valent iron, sulfur-modified coconut shell charcoal, and sulfate-reducing bacteria. The second treatment unit is filled with a second reaction medium, including zero-valent iron, ferric oxide, sulfur-modified coconut shell charcoal, and *Priestia* sp., a non-pathogenic and environmentally friendly bacterium that can simultaneously remove uranium from water through adsorption and reduction. The composite permeable reactive wall process provided by this invention has strong resistance to interference from other substances in the water. When used to simultaneously remove sulfate and hexavalent uranium from groundwater at 15–35°C, the removal rates of both sulfate and uranium in the groundwater are greater than or equal to 90%.

The invention relates to the technical field of biomedicine, in particular to engineered nanoparticles for regulating and controlling obesity-related ion channels and a preparation method and application method thereof, and the engineered nanoparticles are composed of brown adipose cell membrane vesicles, water-soluble embedded membrane conjugated oligomerization electrolyte, amphiphilic molecules and Aifm2 plasmids. According to the engineered nanoparticles for regulating and controlling the obesity-related ion channel, by catalyzing conversion from NADH to NAD < + >, accelerating electron transfer, promoting glycolysis and regulating and controlling the cell membrane ion channel function, intracellular Ca < 2 + > signal transduction is affected, UCP1 heat production is promoted, energy consumption is achieved, and BAT non-trembling heat production is enhanced.

The application discloses a method for promoting As oxidation by activating goethite with antibiotic molecules, and comprises the following steps: S1, goethite preparation; S2, adjusting the pH of a solution containing antibiotic molecules and trivalent arsenic to 5.5-6.5, adding goethite, and carrying out reaction in dark at 23-27 DEG C and 150-190 rpm for 2-72 h to realize the activation of goethite by antibiotic molecules and further complete As oxidation; wherein the concentration of antibiotic molecules in the solution is 45-55 mu M, the concentration of trivalent arsenic is 2.67 mu M, and the adding ratio of goethite to the solution to be treated is 30-50 mg:20 ml; the application firstly proposes that antibiotic molecules can complex and reduce the surface Fe(III) of goethite to generate Fe(II), further promotes the oxidation of As(III), and provides a brand-new treatment mode for the pollution conversion of composite pollutants.

The present invention discloses a material recovery method in the process of microbial anaerobic digestion, and belongs to the technical field of resource utilization of organic solid waste and residual sludge. It includes zeolite modification: modifying zeolite with an iron-containing solution to obtain iron oxide modified zeolite; inoculum: selecting sludge that has undergone anaerobic fermentation as seed sludge, washing, sieving and storing at low temperature, and awakening it with glucose as substrate when it is taken; sludge anaerobic digestion: taking another part of the sludge as substrate, contacting and mixing the seed sludge with the substrate at a ratio of volatile solid VS of (1-2): (2-1) to digest the material; then adding iron oxide modified zeolite to the digested material, reacting in an oxygen-deficient, sealed environment; during the reaction, collecting gas.

According to the cobalt-based sulfide self-supporting catalytic material, the preparation method and the application thereof, the cobalt-based sulfide self-supporting catalytic material has rich Co9S8 and CuCo2S4 heterogeneous interfaces, electron transfer of the interfaces is promoted, the adsorption capacity of an oxygen intermediate is optimized, and the catalytic performance of the cobalt-based sulfide self-supporting catalytic material is improved. And the bifunctional catalytic activity of oxygen evolution reaction and oxygen reduction reaction of the material can be improved. The preparation method of the cobalt-based sulfide catalytic material only relates to simple two-step hydrothermal reaction, compared with an organic solvent, water is adopted as the solvent in the preparation method, so that the preparation method is safer and more environmentally friendly, the hydrothermal temperature is only 80-200 DEG C, and the condition is mild. The cobalt-based sulfide self-supporting catalytic material provided by the invention is applied to a zinc-air battery as a battery positive electrode, the charge-discharge cycle life of the cobalt-based sulfide self-supporting catalytic material is remarkably superior to that of a commercial 20% Pt / C + RuO2 catalyst, and the cobalt-based sulfide self-supporting catalytic material has a good market application prospect.

This invention belongs to the field of nanoenzyme technology, specifically relating to a method for preparing gold magnetic nanoenzymes and a method for enhancing their catalytic activity. Citric acid is added to an aqueous dispersion of Fe3O4 and mixed to obtain citric acid-modified magnetic Fe3O4 nanoenzymes. The citric acid-modified magnetic Fe3O4 nanoenzymes are then added to a solution containing a reducing agent and mixed to obtain a dispersion. A gold-containing compound is added, and the mixture is heated to its boiling point until the solution changes from black to brownish-yellow. The solution is then centrifuged, washed, and magnetically separated. The resulting brownish-yellow substance is redispersed in water to obtain a gold magnetic cascade nanoenzyme. The prepared gold magnetic cascade nanoenzyme possesses cascade catalytic reaction activity.

The invention discloses a preparation method of a high-activity endogenous nitrogen-doped biochar-zero-valent iron composite material, which comprises the following steps: taking agricultural residue bean dregs as a precursor, washing with deionized water for several times, drying, and grinding the dried bean dregs into fine powder; weighing a certain amount of potassium carbonate and bean dreg powder to prepare a solution, violently mixing the prepared potassium carbonate solution and bean dreg powder at room temperature for a period of time, and then drying; grinding the obtained dried product, putting a sample into a crucible with a cover, and pyrolyzing in a muffle furnace in an oxygen-limited environment to obtain charcoal; mixing and stirring the obtained biochar material and hydrochloric acid for a period of time to remove residual potassium carbonate, and repeatedly washing the sample with deionized water until the sample is neutral; the micron zero-valent iron powder and the biochar are added into a planetary ball mill according to a certain proportion to be subjected to ball milling, and the composite material is obtained. Through the mode, the prepared composite material is low in cost and simple in synthesis method, has a high specific surface area, and can be used for reducing and removing hexavalent chromium in a water body.

This invention discloses a method for preparing an iron / carbon quantum dot / biochar composite photocatalytic material and its application, belonging to the field of catalytic decomposition technology. Waste wolfberries are carbonized in an aqueous solution of 0.02–2 mol / L K₄[Fe(CN₆)]·3H₂O at 180–200°C for 6–8 hours. The resulting mixture is then centrifuged at 8000–10000 rpm for 10 minutes to separate the lower solid layer. This lower solid layer is dried at 60–80°C for 6 hours, ground, and sieved to obtain the iron / carbon quantum dot / biochar composite material. This invention uses a one-step synthesis method, eliminating the need for secondary composite processes and avoiding cumbersome and energy-intensive preparation steps. The resulting biochar material can be used as a purification material for sulfonamide and fluoroquinolone antibiotics in water, effectively solving the problem of sulfonamide and fluoroquinolone antibiotic pollution in aquatic environments requiring removal.

The invention relates to a cobaltosic oxide quantum dot modified titanium dioxide multi-heterogeneous interface photoelectrode and construction and application thereof.The photoelectrode comprises 3D TiO2 serving as a substrate electrode and Co3O4 quantum dots loaded on the 3D TiO2, the 3D TiO2 is provided with anatase-rutile phase junctions composed of rutile phase one-dimensional nanorods and anatase phase two-dimensional nanorods, the Co3O4 quantum dots are loaded on the Co3O4 quantum dots, the Co3O4 quantum dots are loaded on the Co3O4 quantum dots, the Co3O4 quantum dots are loaded on the Co3O4 quantum dots, and the Co3O4 quantum dots are loaded on the Co3O4 quantum dots. And a p-n junction is formed between the Co3O4 quantum dot and the 3D TiO2. The 3D Co3O4QDs (at) TiO2 photoelectrode has efficient and stable photoelectrocatalytic oxidation performance in a PEC / PMS system, nearly 100% removal of 20ppm OFL can be achieved within 15-30 min under simulated sunlight, the removal rate of the OFL is still kept at 97.6% after circulation is conducted for five times, and the 3D Co3O4QDs (at) TiO2 photoelectrode has efficient and stable photoelectrocatalytic oxidation reduction performance.