466 results about "Catalytic decomposition" patented technology

The invention discloses a method for preparing tantalum carbide powder by carburization based on a double-effect synergistic effect of molten salt activation and catalytic decomposition, which comprises the following steps: mixing molten salt powder A and tantalum powder to obtain mixed powder, heating the mixed powder to 600-1200 DEG C for activating treatment to obtain activated tantalum powder, separately placing molten salt powder B and the activated tantalum powder in a heating furnace, heating the heating furnace to 100-200 DEG C, heating the heating furnace to 100-200 DEG C, and heating the heating furnace to 100-200 DEG C to obtain the tantalum carbide powder. The heating furnace is heated to enable the molten salt powder B to be converted into molten salt, then carbon source gas firstly flows through the molten salt to form active gas, the active gas makes contact with the activated tantalum powder to react, and the tantalum carbide powder is obtained. On one hand, the tantalum powder is subjected to surface activation treatment through the molten salt, and the reaction activity of the tantalum powder is improved; the molten salt medium assists in organic gas decomposition, the thermal decomposition efficiency of the organic gas is improved, the production energy consumption is effectively reduced under the cooperation of the molten salt auxiliary gas decomposition and the molten salt activation tantalum powder process, and the product purity and uniformity are improved.

The invention discloses an efficient and lasting multifunctional refrigerator deodorant which comprises the following components: (a) 50-85wt% of a porous adsorption material with a high specific surface area; (b) 5-30 wt% of a catalyst capable of effectively catalyzing and decomposing organic odor molecules in a low-temperature environment of 0-10 DEG C; and (c) 3 to 15 weight percent of long-acting slow-release type broad-spectrum antibacterial agent. According to the efficient and lasting refrigerator deodorant and the preparation method thereof, the dual effects of physical adsorption and low-temperature catalytic decomposition are utilized, multiple types of peculiar smell molecules can be rapidly adsorbed and thoroughly decomposed, and the deodorization efficiency is remarkably higher than that of a single adsorbent; the service life is greatly prolonged and is 3-5 times that of common activated carbon, the food decay speed is reduced, the food fresh-keeping period is indirectly prolonged, and food safety is guaranteed. The use process is safe and reliable, the use is convenient, external conditions such as illumination and heating are not needed, the device can be directly placed in a refrigerator, the replacement frequency is reduced due to long-term effect, and the comprehensive use cost is low.

The invention discloses an in-vehicle intelligent mosquito repelling method, and relates to the technical field of intelligent vehicle environment control, and the method comprises the steps: synchronously collecting in-vehicle multi-modal data through a sensor, and carrying out the preprocessing of the in-vehicle multi-modal data, and obtaining the preprocessed in-vehicle multi-modal data; a chemical mosquito repelling mode or a physical mosquito repelling mode is selected based on the preprocessed multi-mode data, and in-vehicle mosquito repelling control is carried out; the mosquito density at the air outlet of the air conditioner is calculated, and if the mosquito density in the unit volume exceeds the preset density, an ultraviolet LED lamp is turned on for catalytic decomposition of dimethyl phthalate residues in the air; according to the method, historical driving data of a user is obtained through a vehicle-mounted T-BOX, an LSTM neural network is adopted for mosquito occurrence probability prediction, a pre-mosquito-repelling request is pushed to a user mobile terminal according to a prediction result, and in-vehicle intelligent mosquito repelling based on multi-modal sensing is completed. Efficient, safe and low-pollution mosquito repelling measures are achieved, response can be conducted quickly, and the health and comfort of passengers are guaranteed.

The invention discloses a preparation method and application of a bimetallic sulfide / three-dimensional porous carbon catalyst, and relates to the technical field of electrolyzed water catalysts.The preparation method comprises the following steps that melamine sponge is cleaned, and the clean melamine sponge is obtained; the preparation method comprises the following steps: dissolving metal salt 1 and metal salt 2 in an ethanol aqueous solution, and adding alkali and an aniline monomer to obtain a precursor solution; completely soaking the clean melamine sponge in a precursor solution, carrying out constant-temperature hydrothermal reaction, and sequentially washing and drying to obtain the melamine sponge anchored with bimetal ions; introducing inert gas for protection, and performing high-temperature vulcanization treatment to obtain the three-dimensional porous carbon catalyst embedded with the bimetallic sulfide heterostructure. The catalyst comprises uniformly dispersed bimetallic sulfide nanoparticles and a spongy three-dimensional porous carbon carrier, shows excellent bifunctional catalytic activity and stability when being applied to an electro-catalytic water decomposition reaction, and has a wide application prospect.

The invention belongs to the technical field of nano-drugs, and discloses a multifunctional nano-drug delivery system for treating neovascular eye diseases and a preparation method of the multifunctional nano-drug delivery system. The nano drug delivery system disclosed by the invention is a composite nano preparation which takes dendritic mesoporous silica nanoparticles as a carrier and co-loads cerium zirconium oxide nano enzyme and an anti-VEGF (vascular endothelial growth factor) drug, various active oxygen can be efficiently removed, oxygen is continuously released through catalytic decomposition of hydrogen peroxide, a retina hypoxia microenvironment is improved, and the retina hypoxia effect is improved. According to the present invention, the anti-VEGF drug delivery system can reduce the oxidative stress induced retinal pigment epithelial cell apoptosis rate, reduce the inflammatory reaction, and simultaneously achieve the slow release and the controlled release of the anti-VEGF drug, and the drug effect maintenance time can achieve more than 60 days, such that the multi-target synergistic treatment can be achieved through the synergistic regulation of the multiple pathological links such as oxygen deficit-oxidative stress-inflammation-angiogenesis, and the anti-VEGF drug delivery effect can be achieved. The choroidal neovascularization can be effectively inhibited by single intravitreal injection, and a new strategy of multi-target collaborative treatment is provided for neovascular macular degeneration and other eye diseases.

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

The invention provides a composite polymer coconut shell charcoal tufted carpet as well as a preparation method and application thereof, and belongs to the field of polymer composite carpets. The adsorption layer is compounded on the back surface of the bonding layer, so that organic matters and toxic and harmful substances in the carpet are efficiently removed. The coconut shell charcoal in the adsorption layer is acidified by nitric acid, then an active functional group is introduced, the coconut shell charcoal and a titanium source are subjected to a hydrothermal reaction, then calcination is performed to improve the crystallinity and the interface bonding force, and the adsorption-photocatalytic decomposition dynamic cycle of volatile organic compounds is achieved. And meanwhile, interlayer adhesion is enhanced by combining a needling process, and high mechanical strength and environmental protection performance are synchronously realized. Through multi-component cooperation and process optimization, a carpet solution with functionality and durability is provided for the fields of automotive interiors and the like.

The invention relates to the technical field of combustion equipment, and discloses a pure ammonia combustor carrying ammonia catalytic combustion and decomposition compositing and a control method.The pure ammonia combustor comprises a combustion sleeve, the combustion sleeve comprises an inner sleeve body and an outer sleeve body, an outer cavity is formed between the inner sleeve body and the outer sleeve body, and the inner sleeve body is provided with an inner cavity; the inner cavity comprises a combustion nozzle, a combustion cavity and a to-be-combusted cavity, a first ignition device is arranged between the combustion cavity and the to-be-combusted cavity, the to-be-combusted cavity communicates with a first air inlet, and the outer cavity comprises a preheating cavity, a combustion catalysis cavity and a catalytic decomposition cavity; the preheating cavity is located on the periphery of the combustion cavity. The combustion catalysis cavity is located on the periphery of the to-be-combusted cavity and provided with an ammonia catalytic combustion catalyst and a second ignition device, and the catalytic decomposition cavity is provided with an ammonia catalytic decomposition catalyst and communicates with the to-be-combusted cavity. The problems that pure ammonia ignition is difficult, the laminar flow combustion speed is low, flames are difficult to stabilize, and NOx emission is high are solved.

The invention relates to a self-supporting electrode and a preparation method and application thereof, and belongs to the technical field of new energy and alkaline electro-catalytic water decomposition. A preparation method of a self-supporting electrode comprises the following steps: taking a nickel net, foamed nickel or a stainless steel net as a substrate, taking deionized water containing a ferric iron compound and phosphate as an etching solution, soaking the substrate in the etching solution at room temperature, taking out the substrate, and drying at room temperature to obtain a surface-modified self-supporting electrode; according to the method, PO4 < 3-> is introduced while the Fe / M self-supporting electrode is synthesized through a one-step etching method, so that the free energy of * OH and * O intermediates is adjusted, the valence state is adjusted, and the oxygen evolution reaction rate is increased; meanwhile, PO4 < 3-> and Fe sites act, so that the Fe coordination sites are stabilized, and precipitation of iron is prevented; the self-supporting electrode prepared by using a room-temperature one-step chemical etching method not only has good water electrolysis oxygen evolution reaction activity, stability and repeatability, but also is simple and rapid in preparation process and low in cost, and large-scale industrial production can be realized.

The invention belongs to the technical field of hydrogen production by photothermal catalytic decomposition of seawater / sewage, and particularly relates to a construction method of a gas-gas-solid interface seawater desalination / sewage purification and in-situ hydrogen production reaction system. The reaction system consists of a bifunctional photo-thermal catalysis / evaporation material and a reaction device, solar energy is taken as an energy source, and seawater / sewage is taken as a reactant to carry out gas-steam-solid interface seawater desalination / sewage purification and photo-thermal decomposition of water to produce hydrogen. The bacterial cellulose hydrogel is used as a supporting substrate of a water supply substrate and a photo-thermal evaporation material, and the photo-thermal catalytic material is limited on an air-water interface, so that the stability of the photo-thermal catalyst is improved, and the defects of underwater light attenuation, large hydrogen mass transfer resistance and the like of a traditional liquid phase reaction system are overcome. Seawater desalination / sewage purification is synchronously realized, hydrogen is produced through in-situ decomposition of desalted water vapor, and the synchronous improvement of the seawater desalination / sewage purification rate and the in-situ water decomposition hydrogen production rate is promoted through the design of a gas-steam-solid interface reaction system.

The invention relates to the technical field of petroleum engineering well cementation, and discloses a well cementation construction process of a highly-deviated well, which comprises the following steps of: cleaning an oscillating foundation, and stripping well wall pollutants by generating an oscillating effect through periodically changing circulating pressure and flow velocity; electrochemical synergistic cleaning is carried out, and organic pollutants are decomposed through the electrolysis effect; catalytic decomposition cleaning accelerates fracture of a mud cake polymer molecular chain; carrying out ion exchange treatment to change a pollutant charge distribution state; and a circulating purification step: removing reaction products in real time and recovering reaction conditions. Physical and chemical composite cleaning is achieved through the synergistic effect of multiple processes, highly-deviated well annulus pollutants are thoroughly removed, and the well cementation quality and the shaft sealing performance are remarkably improved.

The invention discloses an indoor intelligent formaldehyde detection and purification device and a use method thereof. The device comprises a movable shell, a self-adaptive intelligent control system, a pretreatment unit, an efficient adsorption unit and a core catalysis unit. The pre-treatment unit is used for filtering and dehumidifying, the efficient adsorption unit is used for adsorbing formaldehyde and desorbing to realize regeneration of a composite adsorbent layer, and the core catalysis unit is used for catalytically decomposing formaldehyde and desorbed formaldehyde; and the self-adaptive intelligent control system is used for acquiring outdoor air data, dynamically tracking formaldehyde pollution and regulating and controlling purification. Through three stages of units, in combination with a multi-stage cooperative processing and intelligent feedback control technology, formaldehyde is efficiently and directionally removed by virtue of a three-stage linkage mechanism of pre-adsorption enrichment, gradient desorption regeneration and catalytic deep decomposition, the selectivity is good, safety is realized, no extra volatile organic compound is released, and the catalytic efficiency is high; adsorbent regeneration improves stability and reduces cost.

The utility model belongs to the technical field of wastewater treatment, and relates to a two-stage oxidation device for sintering desulfurization and denitrification wastewater treatment. The device comprises a primary ozone treatment module, a secondary ozone treatment module, an ozone generator and an activating and dosing device. The process flow comprises two stages of primary ozone process treatment and secondary ozone process treatment. The wastewater directly reacts and indirectly reacts with ozone in sequence in the treatment process, organic waste in the wastewater is effectively and fully catalyzed and decomposed, and finally up-to-standard discharge is achieved. The device and equipment provided by the utility model are simple, do not need a complex treatment process, are easy to maintain, and are relatively low in maintenance medicament cost. The device provided by the utility model has continuity, can realize continuous water production, and does not generate secondary chemical pollution.

The invention belongs to the technical field of hydrogen production by electrocatalytic decomposition of water, and provides an iron-doped nickel hydroxide composite iron-doped cerium oxide electrocatalyst and application thereof in electrolyzed water. The iron-doped nickel hydroxide composite iron-doped cerium oxide electrocatalyst comprises a nickel substrate, wherein a porous catalytic activity layer of three-dimensional flower-shaped spherical nanoparticles formed by stacking two-dimensional nanosheets is loaded on the surface of the nickel substrate. The catalytic active layer comprises an iron-doped hexagonal stacked nickel hydroxide structure, the catalytic active layer comprises an iron-doped cubic stacked cerium oxide structure, and no iron with a crystalline structure exists in the catalytic active layer. The iron-doped nickel hydroxide composite iron-doped cerium oxide electrocatalyst disclosed by the invention shows excellent oxygen evolution performance in an oxygen evolution reaction of electrocatalytic water decomposition.

The present invention relates to reactors and reactor components which have good resistance to NH3 and N2 and possibly to H2O at high temperatures and moderate pressures and thus can be used in industrial-scale reactions for the catalytic decomposition of NH3 into N2 and H2.

The application discloses a bifunctional In-doped Ni2Mo3N@Mo2C binary heterojunction catalyst and a preparation method and application thereof. A dimethyl imidazole solution is slowly added into a Mo salt solution to obtain a suspension liquid containing a Mo metal organic framework Mo-MOF; the suspension liquid is left to stand, and a precipitate is centrifuged and washed, and vacuum dried to obtain the Mo-MOF containing the Mo metal organic framework; a Ni salt, an In salt and the Mo-MOF are added into an anhydrous ethanol solution to perform ion exchange, and the precursor is vacuum dried to obtain the bifunctional In-doped Ni2Mo3N@Mo2C binary heterojunction catalyst. The catalyst material has excellent basic oxygen evolution and urea oxidation activity, and has a good application prospect in electrocatalytic decomposition of water, urea-assisted electrolysis of water and treatment of sewage containing urea.

The invention discloses a low-temperature catalytic degreasing and rapid densifying process of an MIM (metal injection molding) forming part, which comprises the following steps: (1) low-temperature catalytic degreasing: in a nitrogen atmosphere, catalytically decomposing a POM (polyoxymethylene) binder by a nitric acid / organic acid composite catalytic system at 80-120 DEG C; (2) surface activation treatment of the degreased green body: performing vacuum plasma cleaning to remove surface catalyst residues, and switching to H2 / N2 mixed gas to reduce residual impurities; and (3) gradient rapid sintering densification: gradient rapid sintering densification is adopted, three-stage gradient temperature control-pressure control is adopted, and the total sintering time is less than or equal to 3 hours. According to the method, low-temperature catalytic degreasing is adopted, the degreasing time is shortened, the surface of a degreased green body is activated, a traditional acid pickling or secondary degreasing step is avoided, gradient rapid sintering densification is achieved, and the density and performance of the material are improved.

The present invention belongs to the field of wastewater treatment technology, and specifically relates to a cascade treatment system and method for aquaculture wastewater based on photoelectrocatalytic degradation. The system includes: a solid-liquid separation device, a photoelectrocatalytic decomposition device, and a capacitive deionization device; the solid-liquid separation device is used to perform solid-liquid separation on aquaculture wastewater to obtain solid waste residue and waste liquid; the photoelectrocatalytic decomposition device is used to perform photoelectrocatalytic degradation on the waste liquid to remove organic matter in the waste liquid. The anode of the photoelectrocatalytic decomposition device is a composite photocatalyst, and the cathode is a modified activated biochar. The anode is used to catalytically degrade the organic matter in the waste liquid during photoelectrocatalytic degradation, and the cathode is used to provide active sites during photoelectrocatalytic degradation; the capacitive deionization device is used to remove charged particles from the waste liquid discharged from the photoelectrocatalytic decomposition device to remove organic matter. The system described in the present invention can be used to separate aquaculture wastewater with high turbidity step by step, achieving more efficient and energy-saving sewage degradation.

The invention belongs to the field of electro-catalytic materials, and particularly relates to a bifunctional electro-catalytic water decomposition material and preparation and application thereof.The preparation method includes the steps that a first MOF precursor material is subjected to a first-stage coordination reaction in a solution containing an auxiliary a and an auxiliary b, and a first MOF is obtained; the first MOF is used as a substrate, a second-stage coordination reaction is carried out on a second MOF precursor material in a solution of an auxiliary c, the second MOF is deposited on the first MOF, and a core-shell double-MOF material is prepared; performing heat treatment on the core-shell dual-MOF material to obtain a heat-treated material; and mixing the heat treatment material with a phosphorus source, carrying out phosphating roasting treatment, and putting a phosphating product into a liquid-phase cooling medium while the phosphating product is hot, and carrying out quenching treatment, so as to obtain the bifunctional electro-catalytic water decomposition material. The bifunctional electro-catalytic water decomposition material prepared by the preparation method disclosed by the invention has excellent HER and OER dual catalytic activity.

The application discloses a metal surface heat treatment device with a self-diagnosis function and a treatment method, relates to the technical field of metal heat treatment devices, and comprises a main base, the upper surface of the main base is provided with a cooling soaking pool, and the upper surface of the main base is further provided with an auxiliary mechanism; the auxiliary mechanism comprises a material conveying component and a gas collecting assembly; the material conveying component comprises a conveying frame body arranged on the upper surface of the cooling soaking pool and provided with a feeding conveyor belt on the upper surface; the gas collecting assembly is composed of a detection component and a processing component; the gas collecting assembly comprises a side base connected with one side surface of the main base, and the upper surface of the side base is provided with a treatment box body; and the processing component comprises a regenerative catalytic oxidizer and a receiving pool. In the scheme, the gas collecting assembly can intelligently collect organic mist generated during metal quenching, and the organic mist is treated through condensation or catalytic decomposition; in addition, the treatment product can be reused to improve the performance of the cooling liquid.

The invention discloses a carbon dioxide catalytic decomposition material which is characterized in that the main effective component of the carbon dioxide catalytic decomposition material is biomass activated carbon / Rh2O3 / NiO phase. The material provided by the invention can more efficiently and stably realize the treatment of decomposing and converting carbon dioxide into carbon monoxide, so that the material is more beneficial to large-scale production and preparation.

The invention relates to the technical field of ammunition destruction flue gas treatment, in particular to a flue gas purification device for ammunition destruction and a use method thereof, and the flue gas purification device comprises a quench tower, a rotational flow spray chamber, a dry adsorption bin, a catalytic decomposition reactor and a discharge monitoring terminal; according to the device, rapid cooling, acid gas neutralization, organic matter and heavy metal adsorption and NOx catalytic reduction are achieved for high-temperature and high-toxicity flue gas generated by ammunition pyrolysis through a multi-stage collaborative purification process, PLC intelligent control and online monitoring are integrated, and three operation modes of conventional operation, emergency operation and regeneration are supported; the system can effectively improve the purification efficiency, realizes independent maintenance of the module, dynamically responds to the destroying working condition change, and ensures that the emission reaches the standard.

The invention discloses decorative cement with formaldehyde adsorption and catalytic decomposition functions and a preparation and construction method thereof, and belongs to the technical field of building materials. The decorative cement is prepared from the following dry powder raw materials in parts by weight: 78-83 parts of an inorganic powdery cementing material, 4-6 parts of a formaldehyde adsorption catalytic decomposition component A, 9-13 parts of a formaldehyde adsorption catalytic decomposition component B and 2-3 parts of an additive. Through compounding of multiple components, efficient adsorption, catalytic oxidation and thorough decomposition of formaldehyde can be achieved under the conditions of normal temperature, normal pressure and natural light, and meanwhile the comprehensive functions of long-acting formaldehyde removal, moisture resistance, bacterium resistance and the like are achieved. The material is simple and convenient in preparation process, can be smeared or sprayed after being mixed with water according to a water-binder ratio during construction, is good in construction performance, can be used as an indoor wall decoration material to replace traditional plastering gypsum, and has environment friendliness, high efficiency and durability.

The invention discloses a copper-based multifunctional close-fitting textile and a preparation method thereof. The copper-based multifunctional close-fitting textile comprises a copper conductive fiber layer which is blended and woven with any other fibers; the natural fiber layer is selected from any natural fiber and is blended with the copper conductive fiber layer, the product integrates antifungal, deodorizing and dustproof synergy and is selectively applied to various use fields, and the blended spinning of the copper conductive fiber layer and the natural fiber layer can make the antistatic performance be improved in a breakthrough manner; in a dry environment, due to static electricity generated by friction in natural fibers, copper ions can quickly disperse electrostatic charges and guide the electrostatic charges to the ground through an electron conduction mechanism, and static electricity accumulation is eliminated. Dust prevention is realized by electrostatic adsorption of particles. The copper ions can destroy bacterial cell membranes and inhibit reproduction of the bacterial cell membranes, and can treat common bacteria such as escherichia coli and staphylococcus aureus and fungi such as trichophyton rubrum and trichophyton asthenia. The photocatalytic material is used for photothermal catalytic decomposition of peculiar smell molecules.

The invention relates to a plant for producing H2 by catalytic decomposition of NH3. The plant according to the invention can be operated in a start-up mode in order to heat the devices of the plant to an elevated operating temperature using a heat transfer medium, for example after interruption of the continuous operation of the plant due to maintenance work. After heating to an operating temperature, the apparatus of the invention may be operated in a production mode to continuously produce H2. The invention also relates to a method for starting up a plant for producing H2 by catalytic decomposition of NH3.

The invention discloses preparation of a nickel and cerium doped cobalt-based catalyst and application of the nickel and cerium doped cobalt-based catalyst in catalytic decomposition of nitrous oxide. The nickel and cerium doped cobalt-based catalyst is of a Ni and Ce co-doped spinel type Co3O4 structure and has a mesoporous structure, and the molar ratio of cobalt to nickel to cerium is 1: 0.12: 0.04. The preparation method comprises the following steps: preparing a mixed solution in which the molar ratio of cobalt nitrate to nickel nitrate to cerium nitrate is 1: 0.12: 0.04 by adopting a coprecipitation method, adding sodium carbonate as a coprecipitator into the mixed solution, adjusting the pH value of the mixed solution to 9 while stirring, carrying out coprecipitation and aging, then washing and drying the precipitate, and roasting for 3 hours in an air atmosphere at 300-400 DEG C to obtain the nickel and cerium doped cobalt-based catalyst. The catalyst provided by the invention has good low-temperature nitrous oxide decomposition capability and anti-interference capability under complex working conditions.

This invention belongs to the field of electrocatalytic materials, specifically relating to bifunctional electrocatalytic water splitting materials and their preparation and application. The preparation steps include: performing a first coordination reaction on a first MOF precursor material in a solution containing promoter a and promoter b to obtain a first MOF; using the first MOF as a substrate, performing a second coordination reaction on a second MOF precursor material in a solution containing promoter c to deposit the second MOF onto the first MOF, thus obtaining a core-shell bifunctional MOF material; subjecting the core-shell bifunctional MOF material to heat treatment to obtain a heat-treated material; then mixing the heat-treated material with a phosphorus source for phosphating and calcination, and rapidly cooling the phosphating product while hot in a liquid-phase cooling medium to obtain the bifunctional electrocatalytic water splitting material. The bifunctional electrocatalytic water splitting material prepared by the method of this invention exhibits excellent dual catalytic activity for both HER and OER.

The invention discloses a sulfonated MXene sensing layer, a preparation method thereof and a biosensor, and belongs to the technical field of electrochemical sensors. The sensing layer contains a sulfonated MXene material, and the sulfonated MXene material is obtained by performing covalent bond modification on a sulfonic acid group on the MXene material. According to the preparation method, sulfonic acid groups are covalently grafted on the surface of MXene through plasma treatment, so that the MXene has high specific surface area, excellent electron conductivity, efficient enzyme immobilization capability and H2O2 catalytic decomposition activity. The biosensor constructed based on the sensing layer comprises a flexible substrate, a three-electrode system and a limited diffusion layer, the response speed, the detection precision, the stability and the anti-interference performance (such as uric acid resistance and ascorbic acid resistance) of the sensor are remarkably improved, and the biosensor is particularly suitable for being applied to an implantable continuous glucose monitoring system.

The application discloses a gold leaching method for pyrite-containing gold ore, and comprises the following steps: after the pyrite-containing gold ore is finely ground, water is added to obtain a slurry; a gold leaching reagent solution is added into the slurry to obtain a mixed leaching solution; the pH value of the mixed leaching solution is adjusted to alkaline, and leaching treatment is performed; and after filtration, a gold-containing leaching solution is obtained; the gold leaching reagent solution comprises polyphosphate, copper salt and thiosulfate; in the gold leaching reagent, polyphosphate is added; under alkaline conditions, polyphosphate ions can be selectively adsorbed or complexed on the surface active sites of pyrite to form a physical or chemical masking layer, thereby effectively blocking the direct contact of pyrite with dissolved oxygen and thiosulfate in the solution, inhibiting the catalytic decomposition of pyrite, significantly reducing the invalid consumption of thiosulfate, stabilizing the pH value and potential of the leaching system, and guaranteeing the efficient leaching of gold.