39 results about "Dissolved iron" patented technology

The invention belongs to the technical field of hydrogen production by water electrolysis, and discloses a device and a method for hydrogen production by alkaline water electrolysis enhanced by active ions regulated and controlled by a magnetic field. An anode magnetic flow channel and an anode non-magnetic substrate in the electrolytic cell are integrally designed and are combined to form an anode magnetic field functional bipolar plate, and the anode magnetic flow channel is formed. In the electrolysis operation process, the migration behavior and spatial distribution of iron ions dissolved in the electrolyte are actively regulated and controlled by applying an external magnetic field to the anode region, so that the iron ion concentration of the electrolyte phase is not increased, and the main body structure and material system of the existing industrial electrolytic cell are not changed; and the dissolved iron ions are directionally enriched on an anode interface. Through the regulation and control, relatively high dynamic iron active site coverage can be maintained on the surface of the anode, the polarization loss of oxygen evolution reaction is reduced, and the efficiency and stability of the process of hydrogen production by alkaline water electrolysis under the conditions of high current density and wide load operation are improved.

The invention discloses a preparation method and application of a FeCo-MOF derived CoFe2O4 / biochar composite material, and belongs to the technical field of antibiotic wastewater treatment. The method comprises the following steps: (1) dissolving terephthalic acid in DMF (Dimethyl Formamide) to form a solution A, dissolving ferric salt and cobalt salt in DMF to form a solution B, mixing the two solutions, reacting, centrifuging, washing, drying and grinding to obtain a FeCo-MOF material; and (2) mixing the FeCo-MOF material with peanut shells, grinding, calcining the obtained mixed powder in an N2 atmosphere, and then grinding to obtain the FeCo-MOF derived CoFe2O4 / biochar composite material. When the prepared composite material is used as a catalyst to degrade OFL in a PMS system, the degradation efficiency reaches 79.78%-89.89%, and the degradation rate constant reaches 0.094 min <-1 >-0.139 min <-1 >.

The application discloses a method for rapidly and harmlessly treating phosphogypsum, and particularly relates to the harmless treatment technical field of industrial solid waste. The method comprises the following steps: mixing raw materials with an alkaline neutralizing agent, a trapping agent and an activating agent, adding a phosphorus solidifying agent and a fluorine solidifying agent, mixing, carbonizing and aging, and obtaining harmless phosphogypsum. The method adopts the alkaline neutralizing agent to rapidly neutralize free acid and improve the pH of the system; the trapping agent adsorbs heavy metals; the activating agent promotes As, Cd and the like to form a difficult-to-dissolve iron oxide gel or a precipitate; the phosphorus solidifying agent and the fluorine solidifying agent perform deep chemical precipitation to form a stable iron-calcium-phosphate / ferric fluoride composite solidified body. The functions of the agents are clear, and the agents have synergistic effects; the solidification effect of the agents on high water-solubility phosphorus, fluorine and various heavy metals is far better than that of a single or simply compounded agent system; and the leaching concentration can be reduced to a level far lower than the national standard.

The invention discloses a Fe-doped Bi2SeO5 nano material as well as a preparation method and application of the Fe-doped Bi2SeO5 nano material. The preparation method comprises the following steps: dissolving ferric chloride hexahydrate, bismuth nitrate pentahydrate and sodium selenite according to a specific ratio by using a hydrothermal synthesis technology and taking pure water as a solvent, and stirring at the room temperature of 25 DEG C until a system is uniform, so as to obtain a precursor mixed solution of the Fe-doped Bi2SeO5 nano material; the mixed solution is subjected to a hydrothermal reaction and then is subjected to heat treatment in an air atmosphere, and the target Fe-doped Bi2SeO5 nano material is finally obtained by regulating and controlling parameters such as a precursor ratio, a hydrothermal reaction temperature, heat preservation time and heat treatment conditions through a system. The nano material is used for catalytic degradation of antibiotics in a PMS system, and has the characteristics of strong anti-interference capability, good tolerance to acid and alkali environments, remarkable catalytic effect, high stability and the like.

The application discloses a kind of magnetic foam structure composite material and its preparation method and application, belong to heat-conducting-wave-absorbing multifunctional material preparation technical field.The in-situ bubble assisted annealing process disclosed in the application is to dissolve iron nitrate, nickel acetate and polyvinylpyrrolidone in deionized water to obtain a mixed solution, then dry the solution to a viscous state, then place the viscous liquid in a tube furnace, pass inert gas and perform high-temperature annealing treatment to obtain the product.The application is simple to operate, has strong repeatability, low production cost, short cycle, is green and environmentally friendly, and can be prepared on a large scale.It can also prepare a series of magnetic foam structure composites by changing the feeding ratio and annealing temperature.The obtained magnetic foam has adjustable composition, texture, high thermal conductivity and wideband microwave absorption characteristics, and has good industrial application potential in heat management, microwave absorption and other fields.

The invention discloses a catalyst for preparing sulfur through low-temperature oxygen-resistant reduction of SO2 as well as a preparation method and application of the catalyst, and belongs to the technical field of catalysts. The method comprises the following steps that under the condition of a low-frequency ultrasonic field, ferric salt and optional auxiliary metal salt are dissolved in water to be mixed to form a metal solution, and then the metal solution is added into nanoscale titanium dioxide to obtain a mixed material; performing ultrasonic oscillation stirring on the mixed material to obtain a precursor solution; carrying out microwave treatment on the precursor solution under a low-frequency microwave condition, then carrying out ultrasonic treatment, standing and aging at room temperature, and drying after aging to obtain a dried block; and grinding the dried block, and roasting to obtain the catalyst for low-temperature oxygen-resistant reduction of SO2 to prepare sulfur. The catalyst is prepared under the synergistic effect of microwaves and ultrasonic waves, the structure of the catalyst is optimized, and the catalyst has more uniform and smaller particle size, shows larger specific surface area, exposes more active sites and can be used under complex atmosphere conditions such as oxygen-containing, water-containing, hydrogen-containing and the like.

The invention relates to the technical field of electro-catalytic materials, in particular to a CeFe-coated C / NF self-supporting electro-catalytic material and a preparation method and application thereof.The preparation method comprises the steps that ferric salt, terephthalic acid and benzoic acid are dissolved in a mixed solution of N, N-dimethylformamide, ethyl alcohol and water, then a first hydrothermal reaction and calcination are conducted, and derivative powder of an Fe-based MOF precursor MIL-53 (Fe) is obtained; the preparation method comprises the following steps: adding derivative powder of a Fe-based MOF precursor MIL-53 (Fe), cerous nitrate hexahydrate and polyvinylpyrrolidone into a mixed solution of ethanol, ethylene glycol and water, and uniformly mixing to obtain a mixed solution; the foamed nickel is put into the mixed solution for a second hydrothermal reaction, and the CeFe-coated C / NF self-supporting electro-catalytic material is obtained. According to the method, monocarboxylic acid benzoic acid is adopted as a structure regulating agent to obtain an ultrathin nanosheet-shaped Fe-based MOF precursor MIL-53 (Fe) nanosheet with a controllable microstructure and a controllable crystal structure, the nanosheet is calcined and then loaded with CeO2 in situ, and the problems that in the prior art, an electrocatalyst is high in manufacturing cost, high in overpotential and low in catalytic activity are solved.

The invention discloses a platinum-iron-molybdenum catalyst with high activity and stability as well as a preparation method and application thereof, and belongs to the technical field of heterogeneous catalysis. The preparation method comprises the following steps: dissolving ferric nitrate, ammonium molybdate and citric acid in water, mixing, and adjusting the pH value to be less than 1.0; carrying out water bath gelation on the solution, drying, and calcining in a tubular furnace to obtain an iron molybdate carrier; mixing a platinum source with the iron molybdate carrier, drying by distillation in an oil bath, and calcining in a muffle furnace after drying to obtain the platinum-iron-molybdenum catalyst. The platinum-iron-molybdenum catalyst prepared by the preparation method disclosed by the invention can show efficient catalytic activity and excellent stability in propane oxidation reaction no matter whether the platinum cluster prepared in advance or the precursor salt of direct wet impregnation platinum is loaded.

The invention discloses iron phosphate and a preparation method thereof.The preparation method of the iron phosphate comprises the steps that iron phosphate slag is dissolved with acid, and iron phosphate metal liquid is obtained; carrying out recrystallization and solid-liquid separation on the iron phosphate metal liquid, and washing the separated solid phase to obtain a washing material; mixing the sizing material with a cloth bag dust collection material, and carrying out solid-liquid separation to obtain an iron phosphate dihydrate filter cake; and sequentially drying and roasting the iron phosphate dihydrate filter cake to obtain the anhydrous iron phosphate. According to the invention, the cloth bag dust collecting material can be recycled by adopting lower energy consumption and a simpler process, so that the production cost is greatly reduced. Meanwhile, the cloth bag dust collection material is dehydrated, does not need to be dehydrated in the sintering process, and is doped among the iron phosphate dihydrate particles, so that the probability of forming hard agglomeration among the particles is reduced, and the particle consistency of the anhydrous iron phosphate product is improved.

The invention discloses a method for repairing a bolt with a rusted surface. The method comprises the following steps that the bolt with the rusted surface to be repaired is placed in a cleaning tank containing acid cleaning liquid; the sound velocity and the conductivity of tank liquid are monitored in real time through a cooperative sensing system arranged in a circulation loop of the cleaning tank; calculating the concentration of acid in the acidic cleaning solution and the concentration of dissolved iron generated by dissolution of the rust in real time; calculating the instantaneous dissolution reaction rate of the rust in the acidic cleaning solution; an end point of the cleaning process is determined based on a variation trend of the instantaneous dissolution reaction rate, and the cleaning step is terminated when the end point is reached. According to the method, the reaction rate is monitored in real time, the optimal end point of rust removal is automatically judged, it is guaranteed that rust is thoroughly removed, meanwhile, the situation that bolt base metal is damaged due to excessive cleaning is avoided, and therefore the high consistency of repairing quality is guaranteed.

A method for preparation of an iron salt battery electrolyte comprises: supplying FeCl3 into an agitated reactor containing a dilute solution of HCl having a pH less than 1; supplying elemental iron into the reactor such that the elemental iron reacts with iron(III) to form iron(II); monitoring the pH of reactor solution; using the monitored pH to control supplying additional HCl into the reactor in order to maintain a pH of the reactor solution less than 1; and converting excess Fe3+ to Fe2+ in an electrochemical cell having a membrane or separator between an anode and cathode by directing the reactor solution from the reactor through the anode. A flow rate of the reactor solution through the anode is controlled to obtain a final Fe3+ concentration in the anode outlet FeCl2 stream of 15% or less than 15% of a total dissolved iron concentration as the iron salt battery electrolyte.

The invention discloses an attapulgite / bimetal oxide composite material and a preparation method and application thereof, and relates to the technical field of heavy metal Cd (II) treatment.The preparation method comprises the following steps that 1, ferric salt and magnesium salt are dissolved in a water-based solvent to form a homogeneous solution, 2, attapulgite powder is added into the solution obtained in the step 1, stirring reaction is conducted under the alkaline condition, and the attapulgite / bimetal oxide composite material is obtained; carrying out solid-liquid separation, drying and grinding to obtain an attapulgite / double-metal hydroxide composite material; and (3) calcining the A-LDH obtained in the step (2) in an inert atmosphere, and cooling to obtain the attapulgite / bimetallic oxide composite material. According to the invention, A-LDH is synthesized by adopting a simple coprecipitation method, and ATP is uniformly distributed on the surface of FeMg-LDH. Therefore, along with the improvement of the dispersing performance of the A-H composite material in an aqueous solution, the aggregation behavior of LDH is obviously reduced, and after the A-LDO is further formed through high-temperature pyrolysis, the distribution area of each component is uniform, the pore structure is richer, and the adsorption effect is better.

The invention discloses a preparation method of a Fe-based catalyst for preparing ethanol through CO2 hydrogenation in the technical field of catalysts, which comprises the following steps: step 1) solution mixing: dissolving iron salt and a complexing agent in water and fully stirring to form a uniform solution, and aging and washing to obtain a material; (2) drying the solution: putting the material obtained in the step (1) into a drying oven, and carrying out drying operation to obtain a dried material; (3) calcining a precursor: calcining the material obtained in the step (2) in a muffle furnace in calcining equipment to obtain a catalyst; 4) atmosphere treatment: carrying out atmosphere treatment on the material obtained in the step 3) to obtain an active component iron species; and step 5) carrier loading: loading an active component iron species on the carrier to obtain the combined catalyst, the Fe-based catalyst which is mild in reaction condition, simple in preparation method, environment-friendly, energy-saving and high in economic benefit is obtained, and the Fe-based catalyst can be used in preparation of ethanol by hydrogenation of carbon dioxide.

The application provides a preparation method of an iron-zinc co-doped graphite-like wastewater self-purification catalyst and application thereof, and the method comprises the following steps: dissolving iron metal salt and zinc metal salt in deionized water, adjusting pH to form a solution A by using ammonia water, adding melamine to form a dispersion B after stirring, then adding an organic complexing agent, stirring, and then stirring to dryness in a water bath, and then drying in a blast drying oven, and finally uniformly grinding the obtained product and sodium bicarbonate, and then calcining, and grinding the obtained black solid to obtain the Fe 0 -Fe x C y @C catalyst. The preparation method is simple, requires low equipment, and the prepared Fe 0 -Fe x C y @C catalyst can effectively and rapidly remove organic pollutants such as bisphenols, ciprofloxacin and sulfamethoxazole in water without adding an oxidant; has excellent removal effect on difficult biodegradable organic pollutants at neutral room temperature, has high stability, and has very low metal ion dissolution rate.

The invention relates to a chloride ion modified beta-type iron oxyhydroxide material, a preparation method and a method for separating hexafluoropropylene / octafluoropropane mixed gas, and belongs to the technical field of fluorine special electron gas separation and purification. The preparation method comprises the following steps: dissolving chloride of iron into a mixed solvent of ethylene glycol and water to obtain an iron salt solution; adding oxalic acid into the ferric salt solution to obtain a mixed solution; and reacting the mixed solution at 100-180 DEG C for 6-24 hours to generate a precursor, heating the precursor in an inert atmosphere to 150-250 DEG C, and calcining for 1-6 hours to obtain the chloride ion modified beta-type iron oxyhydroxide material. A set amount of chloride ions are introduced into a beta-FeOOH structure, the pore size distribution of beta-FeOOH can be regulated and controlled, the pore size of beta-FeOOH can allow hexafluoropropylene with small dynamic size to enter, octafluoropropane with large dynamic size is prevented from entering, and the requirement for separating and purifying hexafluoropropylene / octafluoropropane mixed gas through an adsorption method is met.

The invention provides a Na-containing spinel type iron-cobalt bimetallic catalyst and a preparation method and application thereof, and relates to the technical field of catalysts.The method comprises the steps that iron source soluble salt and cobalt source soluble salt are dissolved in deionized water, and ammonia water is added to prepare an alkaline mixed solution; the alkaline mixed solution is placed in a hydrothermal reaction kettle for a hydrothermal reaction, and an iron-cobalt bimetallic oxide reaction product is obtained; the iron-cobalt bimetallic oxide reaction product is subjected to suction filtration and washing with a NaOH-containing aqueous solution, the mass fraction of Na in the catalyst is controlled to be 0.1-3 wt.% by regulating and controlling the concentration and the volume of the NaOH aqueous solution for washing, and the Na-containing spinel type iron-cobalt bimetallic catalyst is obtained after drying. By regulating and controlling the mass fraction of Na in the catalyst, the directional regulation and control of product distribution in the CO2 hydrogenation reaction can be realized, and the product requirements of various different application scenes can be met.

A method for producing an iron chromium electrolyte, the method comprising leaching iron and chromium from a ferrochrome alloy using hydrochloric acid at an elevated leaching temperature. A crude iron chromium electrolyte comprising dissolved iron and dissolved chromium is produced. The crude electrolyte is purified and conditioned to produce a functional iron chromium electrolyte.

This invention provides an iron-modified magnesium slag-based amorphous iron hydroxide composite material, its preparation method, and a method for synergistically removing iron and manganese from acidic mine water, belonging to the technical field of mine water treatment materials. The preparation method of the composite material includes: dissolving iron salt in water to obtain an iron salt solution; adding undisturbed magnesium slag to the iron salt solution for a co-precipitation reaction; after the co-precipitation reaction is complete, performing solid-liquid separation, washing, and drying to obtain the iron-modified magnesium slag-based amorphous iron hydroxide composite material; wherein the undisturbed magnesium slag serves as an alkali source and silicon source to provide OH... ‑ The active silicate ions and the hydrolysis products of iron salts co-precipitate to form silicon-doped amorphous iron hydroxyl oxide. This invention yields a highly stable amorphous composite material with a specific surface area more than 18 times higher than that of undisturbed magnesium slag, exhibiting both slow alkalinity release and efficient adsorption catalysis.

The present disclosure provides methods and compositions for dissolving iron sulfide deposits in aqueous systems. The method may include adding the composition to an aqueous medium. The composition may include a polycarboxylate polymer and / or a salt thereof. The composition may optionally comprise a solvent and / or an additive. The compositions and methods are useful for dissolving typical insoluble inorganic salts encountered in the oil gas, recovery, water, and processing industries.

The application provides a wave-absorbing composite material preparation method and a wave-absorbing composite material, and the method comprises the following steps: placing foamed nickel in a hydrochloric acid solution for ultrasonic treatment; sequentially performing ultrasonic cleaning treatment on the foamed nickel by using deionized water and anhydrous ethanol, and drying the foamed nickel to obtain pretreated foamed nickel; dissolving iron nitrate nonahydrate, nickel nitrate hexahydrate, polyvinylpyrrolidone and urea in deionized water to obtain a uniform mixed solution; performing hydrothermal reaction on the uniform mixed solution and the pretreated foamed nickel to obtain an intermediate product; performing ultrasonic cleaning and drying treatment on the intermediate product to obtain FeNi layered double metal hydroxide / foamed nickel, and placing the FeNi layered double metal hydroxide / foamed nickel in an inert atmosphere tube furnace for high-temperature calcination treatment, naturally cooling to room temperature for second heat preservation treatment, and obtaining a FeNi-based composite metal oxide / foamed nickel composite material, so as to solve the problem that current wave-absorbing materials are difficult to simultaneously consider excellent impedance matching and strong electromagnetic wave attenuation capability, and the wave-absorbing effect is not ideal.

The application discloses a kind of based on iron mineral base material catalytic oxidation self-precipitation technology's manganese-containing mining and metallurgical wastewater treatment method, the steps of the treatment method include: pre-adjusting the pH of manganese-containing mining and metallurgical wastewater, remove non-complex state divalent manganese ion and coexisting pollutant;Iron mineral base catalyst is added and ozone is passed to form strong oxidizing free radicals, iron mineral base catalyst mineral phase reconstruction occurs homogeneous dissolution, iron atom is converted and released as high valence iron;Ozone, strong oxidizing free radicals and high valence iron synergistically catalyze oxidation complex state and non-complex state divalent manganese ion, manganese ion form conversion occurs self-precipitation;High valence iron bridging network, iron self-flocculation occurs, and flocculation-co-precipitation reaction of manganese iron ion occurs, to obtain flocculation-co-precipitate;Separation is carried out through inclined-tube sedimentation tank.The application realizes the efficient conversion of ozone and the oxidation and deep removal of complex state and non-complex state manganese ion by introducing iron mineral base catalyst, reduces the cost while realizing waste treatment with waste.

The invention provides a ferronickel-based self-supporting oxygen evolution electrode and a preparation method thereof. The preparation method comprises the following steps: S1, adding ferric salt, nickel salt and an additive into a solvent to obtain a metal seed solution; s2, an electrode substrate is placed in the metal seed solution, the surface of the electrode substrate is heated at the initial pH at the heating rate of 0.7-2.5 DEG C / min to form an iron-rich phase, when the pH reaches 6.5-7.5, a nickel-based transition layer is formed on the surface of the iron-rich phase at the heating rate of 0.1-0.7 DEG C / min, and when the pH reaches 7.5-8, the nickel-based transition layer is formed on the surface of the iron-rich phase at the heating rate of 0.1-0.7 DEG C / min; and stopping heating and carrying out heat preservation reaction to form the ferro-nickel layered double hydroxide on the surface of the nickel-based transition layer. The controllable preparation of the high-performance self-supporting electrode is realized by accurately controlling the hydrothermal reaction process, the pores of the three-layer structure prepared on the surface of the electrode substrate are sequentially increased from inside to outside, the discharge of reactant bodies and products is promoted, compared with the prior art, the ion diffusion path is shortened by the three-layer graded pore channels, the concentration polarization is obviously reduced, and the performance of the electrode is improved. The catalytic activity and the service life are both considered.

The invention provides a condenser pickling cleaning solution which is composed of the following components in percentage by mass: 3%-8% of sulfamic acid, 1%-4% of glycolic acid, 1%-4% of formic acid, 0.5%-2% of EDTA (Ethylene Diamine Tetraacetic Acid) disodium salt, 0.1%-0.5% of organic phosphonate, 0.05%-0.2% of zinc salt, 0.1%-0.5% of a copper corrosion inhibitor, 0.01%-0.1% of a nitrogen-containing surfactant, 0.05%-0.3% of a dispersing agent and the balance of water. By compounding sulfamic acid, glycolic acid and formic acid, iron scale and calcium scale are efficiently dissolved, and the corrosion rate is low. The organic phosphonate, the zinc salt and the copper corrosion inhibitor form an omnibearing metal protection system. The EDTA and the dispersing agent ensure stable dispersion of the dirt and the ions, so that secondary deposition and blockage are avoided, and safe and efficient cleaning is realized.

The application discloses a method for removing new pollutants in groundwater by injecting in-situ reaction zone, and belongs to the field of groundwater pollution remediation of contaminated sites. The method comprises the following steps: (1) preparing a solid particle catalyst slurry; (2) preparing an oxidizing agent solution; and (3) synchronously injecting the catalyst slurry obtained in the step (1) and the oxidizing agent solution obtained in the step (2) into an aquifer, respectively, so that the catalyst slurry and the oxidizing agent solution react in a water environment to form an in-situ reaction zone. The method uses a non-dissolved iron-manganese catalyst to prepare the catalyst slurry, avoids the early dissolution of the iron-manganese catalyst in water to generate ferrous ions, avoids the early activation of persulfate to cause the instantaneous generation of a large number of free radicals and cause self-annihilation reaction, and causes the loss of the oxidizing agent, so that the utilization rate of the oxidizing agent is effectively improved, and the cost of the reagent is saved.

This invention provides a method for degrading water pollutants based on iron-manganese intercalated montmorillonite and low molecular weight humic acid. In this method, the carboxyl groups, phenolic hydroxyl groups, and kun groups in the low molecular weight humic acid can dissolve some of the Fe in the iron-manganese intercalated montmorillonite and form Fe(II) / Fe(III)-organic complexes. These complexes can shuttle electrons from Fe(II) in the interlayer structure of the iron-manganese intercalated montmorillonite to O2, promoting the generation of reactive oxygen species. Furthermore, the kun groups in the low molecular weight humic acid can act as bridges, mediating the shuttle of Fe(II) from the interlayer structure of the iron-manganese intercalated montmorillonite to O2, thereby generating more reactive oxygen species. This achieves the goal of degrading pollutants in water. The removal rate of antibiotics in water reaches 90-98%, the removal rate of estrogen reaches 92-99%, and the removal rate of endocrine disruptors reaches 95-99%.

The invention discloses a FeCo / ZSM-5 catalyst as well as a preparation method and application thereof. According to the catalyst, a ZSM-5 molecular sieve with a specific silica-alumina ratio is used as a carrier, and active components of iron (Fe) and cobalt (Co) are loaded. The preparation method comprises the following steps: dissolving an iron source and a cobalt source in an alcohol solvent, adding the ZSM-5 molecular sieve, carrying out ultrasonic-assisted impregnation, drying, grinding and carrying out high-temperature roasting in an inert atmosphere. According to the method, the dispersity of metal components in pore channels of the molecular sieve is improved by utilizing ultrasonic-assisted impregnation, high CO conversion rate and high liquid fuel (C5 < + >) selectivity are realized under the condition of low-hydrogen-carbon-ratio synthesis gas by regulating and controlling the acidity of the carrier and the Fe-Co bimetallic synergistic effect, and meanwhile, the generation of byproducts such as methane and carbon dioxide is remarkably inhibited. The catalyst is simple in preparation process and high in mechanical strength, and has a good industrial application prospect.

The invention provides a NiMo-coated NiFe-LDH electrocatalyst with a heterostructure as well as a preparation method and application of the NiMo-coated NiFe-LDH electrocatalyst. The method comprises the following steps: dissolving ferric salt, nickel salt, ammonium fluoride and urea in a solvent to form a homogeneous solution; the solution and pretreated foamed nickel are subjected to a one-step hydrothermal reaction, after the reaction is finished, ethanol-water alternate washing is conducted, vacuum drying is conducted, and a NiFe-LDH precursor is obtained; the preparation method comprises the following steps: by taking a precursor as a working electrode, carrying out electro-deposition in an electrolyte containing Ni and Mo components, so as to grow a compact and uniform totem-shaped NiMo layer on the surface of NiFe-LDH in situ, and finally obtaining the NiMo-NiFe-LDH heterojunction electrocatalyst. According to the catalyst, high conductivity of the NiMo layer and high intrinsic activity of NiFe-LDH are utilized, more accessible active sites are synergistically exposed, an interface rapid electron transmission channel is constructed, and hydrogen evolution / oxygen evolution overpotential is remarkably reduced; and meanwhile, the compact NiMo layer can effectively block electrolyte erosion and inhibit structure collapse, so that efficient and stable electrochemical hydrolysis is realized.

The invention discloses a manganese-containing ore metallurgical wastewater treatment method based on an iron mineral-based material catalytic oxidation self-precipitation technology, and the treatment method comprises the following steps: pre-adjusting the pH value of the manganese-containing ore metallurgical wastewater, and removing non-complexed divalent manganese ions and coexisting pollutants; an iron mineral-based catalyst is added, ozone is introduced to form strong oxidizing free radicals, the iron mineral-based catalyst is subjected to mineral phase reconstruction and homogeneous dissolution, and iron atoms are converted and released into high-valence iron; the ozone, the strong-oxidizing free radicals and the high-valence iron cooperate to catalyze and oxidize complex-state and non-complex-state divalent manganese ions, and the manganese ions are subjected to form transformation to generate self-precipitation; high-valence iron is bridged to form a net, iron self-flocculation occurs, and ferromanganese ions are subjected to a flocculation-co-precipitation reaction to obtain a flocculation-co-precipitate; and separating through an inclined tube sedimentation tank. By introducing the iron mineral-based catalyst, efficient conversion of ozone and oxidation and deep removal of complexing state and non-complexing state manganese ions are realized, the cost is reduced, and the purpose of treating waste with waste is realized.

The invention relates to a Klebsiella variicola ZF-01 strain and an application thereof. The strain is preserved in the Guangdong Microbial Culture Collection Center, the address of the preservation unit is the 5th floor of the building 59, No.100 Courtyard, Xianlie Middle Road, Guangzhou, the preservation time is November 05, 2025, and the preservation number is GDMCC No.66771. According to the method disclosed by the invention, the deep effect between the Klebsiella variicola and the minerals is utilized, and iron minerals are dissolved by using metabolites of the iron reducing bacteria, so that crystal lattices of the minerals are destroyed, so that impurity components are dissolved out, and a new thought is provided for promoting the development of kaolin iron removal and whitening towards a green, efficient and low-carbon direction.