79 results about "Iron oxyhydroxide" patented technology

A raw material solution containing trivalent iron ions, or trivalent iron ions and ions of a metal element that partially substitutes Fe sites, and an alkaline aqueous solution for neutralizing the raw material solution are added to a reaction system to adjust the pH of the reaction system from 1.0 to 3.0 or lower. Hydroxycarboxylic acid is added to the obtained reaction solution and the pH of the reaction system is then neutralized from 7.0 to 10.0 or lower. The obtained precipitate of a substituent metal element-containing iron oxyhydroxide is coated with silicon oxide, followed by heating so as to form particles of ε-iron oxide in which Fe sites are partially substituted by other metal elements, and then, a slurry containing the particles is classified. The iron-based oxide magnetic powder has a particle shape close to a perfect sphere and is suitable for use in a magnetic recording medium.

The application discloses a kind of composite desulfurizer suitable for oxygen-containing condition desulfurization and its preparation method and application, belong to desulfurizer technical field.The composite desulfurizer is double-layer composite structure;Wherein: outer layer is iron oxide hydroxyl layer, including iron oxide hydroxyl and first binder;Inner layer is copper zinc aluminum layer, including copper oxide, zinc oxide, alumina and second binder.The composite desulfurizer obtained in the application significantly improves the service life of desulfurizer under oxygen-containing condition, and the sulfur capacity of desulfurizer can be as high as 10~20%, and the simultaneous removal of organic sulfur and inorganic sulfur can be realized in one step, effectively reducing the desulfurization cost, with important application prospect.In addition, the preparation of double-layer structure composite desulfurizer is realized by double-layer extruding machine in the application, and the process is simple, which is beneficial to industrialized mass production.

The invention discloses a FeOOH / CNT composite layer modified diaphragm for a lithium-sulfur battery and a preparation method of the FeOOH / CNT composite layer modified diaphragm. The diaphragm takes a polypropylene diaphragm as a substrate, the surface of the diaphragm is modified with a composite layer composed of FeOOH and CNT, and the diaphragm is of a winding bar winding structure. The one-step synthesis is adopted, the reaction conditions are mild, and the process is simple. FeOOH enhances the adsorption effect on polysulfide by exposing abundant active sites, effectively inhibits the shuttle effect and improves the redox reaction kinetics; meanwhile, the CNT constructs a three-dimensional conductive network, the electron transmission path is shortened, and the sulfur positive electrode utilization rate and the interface conductivity are improved. Experimental results show that the initial specific capacity of the lithium-sulfur battery assembled based on the modified diaphragm reaches 1218.3 mAh g <-1 > at 0.2 C, the capacity fading rate of each circle is only 0.075% after 500 circles of circulation at 1C, and the lithium-sulfur battery shows excellent cycle stability and high specific capacity. The diaphragm provides an effective solution for improving the electrochemical performance of the lithium-sulfur battery, and has important application potential.

A method for making an iron-based oxide magnetic powder includes adding raw material solution containing trivalent iron ions, or trivalent iron ions and ions of a metal element that partially substitutes Fe sites, and an alkaline aqueous solution for neutralizing the raw material solution to a reaction system to adjust the pH of the reaction system to 1.0 or higher and 3.0 or lower. Hydroxycarboxylic acid is added to the obtained reaction solution and thereafter the pH of the reaction system is neutralized to 7.0 or higher and 10.0 or lower. The obtained precipitate of a substituent metal element-containing iron oxyhydroxide is coated with silicon oxide and then heated, whereby an iron-based oxide magnetic powder is obtained with a reduced content of fine and coarse particles, a particle shape close to a perfect sphere, and particles of ε-iron oxide in which Fe sites are partially substituted by other metal elements.

The present application belongs to the field of denitration agent preparation, and provides a selective non-catalytic reduction denitration agent and a preparation method thereof. First, urea is heat treated to change hydrogen bond strength and intermolecular force in the crystal, and increase thermal motion of urea molecules, so as to cause loose arrangement between molecules, increase exposure of reaction sites, and increase contact area of molecules, thereby increasing reaction rate. A phosphoric acid group is introduced into the urea after heat treatment, and phosphonated urea is formed through chemical reaction, so as to improve adsorption and reaction activity of the urea. This process helps to enhance the combination ability of urea and NOx, thereby improving the denitration efficiency. Appropriate amounts of sodium carbonate, sodium chloride and hydroxyl iron oxide are added to the reaction system, which helps to promote the activity improvement of the denitration agent, and can effectively deal with nitrogen oxide pollution in industrial waste gas.

A water treatment method for reducing the dissolved silica content thereof, the method being characterized in that it comprises at least one step of adsorbing the dissolved silica, the step consisting of passing the water through a reactor containing a granular adsorbent material consisting of iron(III) hydroxide and / or iron(III) oxyhydroxide grains, and at least one step of regenerating the adsorbent power of the granular material, the step consisting of bringing the granular material into contact with a base and at least one chloride.

The invention relates to the technical field of electromagnetic functional materials, and provides a frequency-band-adjustable ferromagnetic core-shell nanorod wave-absorbing material and a preparation method thereof.The preparation method comprises the steps that an iron oxyhydroxide precursor is prepared through a hydrothermal synthesis method, the iron oxyhydroxide precursor is reduced through a liquid-phase pyrolysis method, and nanorod-shaped ferroferric oxide is obtained; growing a carbon layer on the surface of the nanorod-like ferroferric oxide through a high-temperature sintering method to obtain the nanorod-like ferroferric oxide composite material coated with the ultrathin carbon layer; and carrying out orientation arrangement on the nanorod-like ferroferric oxide composite material coated with the ultrathin carbon layer through magnetic field control. According to the invention, cooperation of structural design and light weight, improvement, regulation and control of electromagnetic characteristics and improvement of electromagnetic wave absorption efficiency can be realized.

The invention relates to the technical field of desulfurizing agents, in particular to a reusable iron oxyhydroxide desulfurizing agent and a preparation method thereof. The problem that the activity of a traditional material is reduced due to sulfate accumulation and compact layer formation in a vulcanization-regeneration cycle is solved. The preparation method comprises the following steps: dissolving ferric nitrate and urea, adjusting the pH value to 1.8, and adding cerous nitrate and citric acid; heating, introducing zirconium oxynitrate, controlling the pH value at 3.7-3.9 for 2-3 hours, heating to 7.2, adding samarium nitrate and zirconium acetylacetonate, aging, and mixing with bentonite and ammonium bicarbonate for molding; and finally, carrying out segmented activation in a nitrogen and low-oxygen mixed atmosphere. The desulfurizer has high specific surface area and pore volume, the breakthrough sulfur capacity reaches 148-160mgS / g, the 10-time circulating sulfur capacity retention rate is 88-91%, and the desulfurizer is high in particle compressive strength, low in abrasion rate and suitable for the industrial desulfurization process.

The invention discloses a rare earth doped iron oxyhydroxide / ferric oxide-three-dimensional graphene composite material and a preparation method thereof, the material is x% RE-FeOOH / Fe2O3 (at) 3D Gr, x is the molar ratio of rare earth ions to iron ions, the value range of x is 1-8.5, RE is one of rare earth elements Ce, La, Sm, Nd or Y, and RE is one of rare earth elements Fe, La, Sm, Nd or Y; the preparation method comprises the following steps: preparing a mixed solution A from an iron salt, a rare earth salt and an alkaline solution, adding a complexing agent into a graphene oxide solution to prepare a mixed solution B, performing ultrasonic treatment on the two solutions, mixing, adding a reducing agent, performing ultrasonic treatment again, and finally performing hydrothermal treatment, washing, freeze drying and low-temperature sintering. Rare earth ions can induce oxygen vacancies, increase active sites and promote ion transmission, the maximum mass specific capacitance of the material under 0.5 A / g reaches 1218.7 F / g, and the maximum capacitance retention rate of a flexible supercapacitor assembled by the material is 97% after 5000 times of charging and discharging.

The application discloses a preparation method and application of an ozone oxidation catalyst. 2+ The preparation method of the ozone oxidation catalyst comprises the following steps: adding a sandstone carrier, Fe, H2O2, an iron source material and wastewater into a fluidized bed reactor to obtain initial reaction liquid with pH of 4-5; swelling the sandstone carrier in the initial reaction liquid; and obtaining the sandstone carrier loaded with hydroxyl iron oxide crystals after reaction of the initial reaction liquid. The catalyst prepared by the application has a nano structure, high active component, and can realize degradation of a large category of wastewater such as coal chemical industry, coking and acrylic fiber by catalyzing ozone. The catalyst is simple and economical to prepare, has less active catalytic species dissolved in the running process, has a large pH range for degradation of the wastewater, and has the advantages of easy preparation, high efficiency, stability and low economic cost.

Provided are: a novel complex capable of efficiently adsorbing and collecting arsenic (V) dissolved in water; and a novel arsenic adsorbent. This complex contains iron (III)-containing particles supported on microfibrous cellulose. At least a portion of the iron (III)-containing particles has an aspect ratio of 2 or more. The iron (III)-containing particles preferably contain at least one iron compound selected from iron oxides, iron hydroxides, and iron oxyhydroxides. This arsenic adsorbent contains the complex.

Provided is a hydrogen sulfide removing agent that can be stably used while maintaining hydrogen sulfide removing ability equivalent to that of a hydrogen sulfide removing agent comprising an amorphous iron oxyhydroxide. This iron oxyhydroxide-based hydrogen sulfide removing agent contains amorphous iron oxyhydroxide and a crystalline component. The content of the amorphous iron oxyhydroxide is not less than the content of the crystalline component.

The multifunctional high-capacity reinforced flocculant composite material comprises a Cu (II) removal flocculant, an Hg (II) removal flocculant, an AS (III) removal flocculant, an Ni (II) removal flocculant, an Sb (V) removal flocculant and an AS (V) removal flocculant. The Sb (V) and AS (V) removal flocculants are composite flocculants, the Cu (II) removal flocculant is an Al-Fe loaded flocculant, the Hg (II) removal flocculant is an AlZn50 alloy, the AS (III) removal flocculant is an AlZn20 alloy, and the Sb (V) and AS (V) removal flocculants are composite flocculants which take acrylamide (AM) as a substrate and are inoculated with FeOOH in the process of initiating polymerization. The flocculant composite material disclosed by the invention is suitable for meeting the requirements of high pollution concentration, complex form and speed and efficiency in an emergency process of various heavy metal coexisting wastewater, and is suitable for removing various heavy metal ions under the conditions of large water flow, high heavy metal ion concentration and the like.

The application discloses a method for preparing an ultra-low sulfur iron product and the ultra-low sulfur iron product, and relates to the technical field of high-purity iron products. The method comprises the following steps: obtaining a hydroxyl ferric oxide precursor; placing the hydroxyl ferric oxide precursor in a container, and keeping the temperature in the container at 400-800 DEG C; dehydrating and transforming the hydroxyl ferric oxide into a ferroferric oxide crude product; reducing the ferroferric oxide crude product into magnetite under a reducing atmosphere; oxidizing the magnetite into ferroferric oxide under an oxidizing atmosphere; repeating the reduction-oxidation steps at least once to obtain ultra-low sulfur ferroferric oxide, or repeating the reduction steps at least once to obtain ultra-low sulfur magnetite, or repeating the reduction steps at least once to reduce the ferroferric oxide into iron single substance to obtain ultra-low sulfur iron single substance. The reduction and oxidation steps are cycled to efficiently remove the sulfur wrapped in the crystal lattice and the sulfur in the deep layer of the particles, and meanwhile, the temperature of the fire desulfurization is lowered.

The invention belongs to the technical field of hydrogen preparation by electrolyzing water, and particularly relates to a CoOOH-FeOOH composite electrode as well as a preparation method and application thereof. The preparation method comprises the following steps: loading CoO on a FeOOH / foamed nickel electrode to obtain a CoO-FeOOH / foamed nickel electrode; taking the CoO-FeOOH / foamed nickel electrode as a working electrode, forming a three-electrode system together with a reference electrode and a counter electrode, immersing one end of the three-electrode system into an alkaline electrolyte, and performing electrochemical activation to obtain a CoOOH-FeOOH composite electrode; according to the invention, CoOOH and FeOOH are compounded, so that the technical defects of cobalt oxide and iron oxyhydroxide are overcome; when the hydrogen production device is applied to hydrogen production by electrolyzing alkaline water, high-efficiency, stable and low-cost hydrogen production by electrolyzing water under the alkaline condition is realized.

The invention relates to the technical field of desulfurizing agents, in particular to a ferric oxyhydroxide desulfurizing agent and a preparation method thereof. According to the iron oxyhydroxide desulfurizing agent, zinc oxide nanoparticles are doped on the surface of iron oxyhydroxide, then the zinc oxide nanoparticles and manganese dioxide form a core-shell structure with manganese dioxide as a shell and iron oxyhydroxide as a core, and finally the core-shell structure is loaded on carbon nanofibers to finally obtain the iron oxyhydroxide desulfurizing agent. The iron oxyhydroxide desulfurizer disclosed by the invention has excellent sulfur removal performance, can still keep relatively excellent sulfur removal performance under the condition that interfering ions such as PO4 < 3-> and SO3 < 2-> exist in water, and can be widely applied to the field of industrial sulfur removal.

This invention discloses a method for preparing lithium iron phosphate using iron hydroxyl oxide as an intermediate, belonging to the field of new energy battery materials. The method includes: removing impurities from a ferrous sulfate solution, adding ammonium bicarbonate and ammonium fluoride, heating and passing an oxidizing gas to react and generate the iron hydroxyl oxide intermediate; mixing and milling this intermediate with a phosphorus source, a lithium source, and a carbon source, spray drying, and sintering under an inert atmosphere to obtain lithium iron phosphate cathode material. This invention uses iron hydroxyl oxide as the sole iron source, eliminating the need for the iron phosphate intermediate throughout the entire process. In step two, ammonium fluoride is used for in-situ doping with fluorine, and combined with the structural template effect of the nanorod-shaped iron hydroxyl oxide, uniform nanoparticles are obtained with only one milling operation, forming microporous channels. This method simplifies the production process, reduces equipment investment and energy consumption, and the resulting material exhibits high capacity, high initial efficiency, and excellent rate performance.

The invention discloses a method for producing high-quality diamond by utilizing biochar, and belongs to the technical field of diamond production. The method comprises the following steps: performing drying, crushing, high-temperature deliming and pickling pretreatment on biochar to obtain refined biochar; under the protection of inert gas, mixing with a transition metal catalyst, carrying out high-temperature and high-pressure treatment to complete graphitization, and carrying out acid pickling to obtain high-purity graphite; briquetting graphite and a metal catalyst, and synthesizing diamond under high-temperature and high-pressure conditions; and finally, sequentially carrying out crushing, deep acid pickling and ultrasonic-assisted electrolytic treatment on the diamond synthetic block, adsorbing and removing trace metal impurities by adopting modified iron oxyhydroxide, and carrying out separation, washing, drying, cutting and polishing to obtain the high-quality diamond. According to the method disclosed by the invention, the biochar is used as a sustainable carbon source, and the problems of more biochar impurities, difficulty in graphitization, incomplete impurity removal by a traditional acid pickling method, serious environmental pollution and the like are solved by integrating graphitization, synthesis and green purification processes.

The present application aims to provide a sucrose hydroxyl ferric oxide tablet composition and a preparation method thereof. The present application belongs to the technical field of pharmaceutical preparations, and particularly relates to a sucrose hydroxyl ferric oxide tablet composition and a preparation method thereof. The sucrose hydroxyl ferric oxide is a particle with a certain particle size distribution, and the pharmaceutical composition is prepared by adding pharmaceutically acceptable pharmaceutical adjuvants, the preparation method is simple, the product has small friability, is easy to package, and is more conducive to commercial production.

The application provides a preparation method of a sucrose-hydroxyl iron oxide compound, relates to the field of compound preparation methods, and specifically comprises the following steps: (1) synthesis of hydroxyl iron oxide; (2) desalination; and (3) synthesis of the sucrose-hydroxyl iron oxide compound. In the process of removing the inorganic salt of the hydroxyl iron oxide in the preparation method of the sucrose-hydroxyl iron oxide compound, the hydroxyl iron oxide is first diluted with water and then filtered and desalted, so that the desalination efficiency is significantly improved, the overall production cycle is greatly shortened, the production efficiency is improved, and the production cost is saved.

The application discloses a nickel-iron-based catalyst and a preparation method and application thereof. The preparation method of the nickel-iron-based catalyst comprises the following steps: S1, subjecting a base material to pre-activation treatment to obtain a first precursor, and then subjecting the first precursor to activation treatment to obtain a second precursor; S2, subjecting the second precursor to calcination treatment to obtain the nickel-iron-based catalyst. The nickel-iron-based catalyst comprises a nickel-iron base, and nickel and iron on the surface of the nickel-iron base exist in the form of nickel-iron oxide, nickel-iron oxyhydroxide and a nickel-sulfonic oxygen-iron hetero bridging structure. The nickel-sulfonic oxygen-iron hetero bridging structure has a covalent connection structure of Ni-O-SO3-Fe. In actual application, the nickel-iron-based catalyst can have excellent effects such as high activity and high stability, and can be a self-supporting OER electrode and directly used for an AEMWE anode. The whole preparation method is simple and easy to implement, and has the advantages of low cost and the like.

Provided is a powder of iron oxyhydroxide in which the nanoparticle content is controlled. A powder of iron oxyhydroxide in which the minor axis diameter Dn50 is from 100-300 nm and the proportion of particles having a minor axis diameter of less than 100 nm is 3.0% or less is provided through a method that includes: adding a metal-carbonate-free and metal-bicarbonate-free alkali to an iron(II)-containing aqueous solution to adjust the iron(II) concentration to 0.10-0.35 mol / L; blowing in an oxygen-containing gas to achieve a flow rate of 0.02-0.13 L / min per 1.00 mol of iron(II) while maintaining a solution temperature of 20-35°C; adding iron(II) to satisfy 7.0 ≤ (p + q) / p ≤ 12.0, where p is the substance amount / mol of iron(III) in the resulting nuclei, and q is the substance amount / mol of iron(II) added; adjusting the concentration of iron(II) to 0.45-0.85 mol / L; and blowing in an oxygen-containing gas at a flow rate of 0.01-0.10 L / min per 1.00 mol of iron(II) in a first stage and 0.03-0.12 L / min in a second stage while maintaining a solution temperature of 50-80°C.

The invention discloses a water-eroded slope cropland composite modifier and a preparation method and application thereof, and belongs to the technical field of soil improvement and water and soil conservation. In order to solve the technical problems that traditional biochar is easy to wash off, short in lasting effect and poor in improvement effect in a slope cropland water-eroded environment, the invention provides a composite modifier for water-eroded slope cropland, and amorphous iron oxyhydroxide nanoparticles are accurately loaded on pores and surfaces of biochar through an in-situ synthesis method; by combining the biochar and the calcium chloride-attapulgite composite adhesive, a stable soil aggregate is formed through the cementation effect of the iron oxyhydroxide, the pore adsorption effect of the biochar and the consolidation effect of the calcium chloride-attapulgite composite adhesive, synergistic interaction is achieved, the corrosion resistance and the water binding capacity of the slope cropland are effectively improved, and water and soil synergistic treatment is achieved.

The invention provides an underground water arsenic removal system and a construction method and application thereof, and belongs to the technical field of underground water treatment. The system comprises a trivalent arsenic biological oxidation reactor, a drop oxygenation area and a ferrous biomineralization contact oxidation arsenic removal reactor which are connected in sequence. Wherein a filter material of the trivalent arsenic biological oxidation reactor contains a biological membrane formed by facultative arsenic oxidizing bacteria, so that trivalent arsenic in underground water can be selectively oxidized into pentavalent arsenic, and meanwhile, ferrous oxidation in water is relatively less; the filter material of the ferrous biomineralization contact oxidation arsenic removal reactor contains iron oxidizing bacteria and iron oxyhydroxide minerals, and arsenic removal is realized by biomineralization contact oxidation of ferrous on the filter material. According to the method, the trivalent arsenic is subjected to biological pre-oxidation through the trivalent arsenic biological oxidation reactor, so that the arsenic removal efficiency in the subsequent ferrous iron biological mineralization contact oxidation stage is remarkably improved, and different types of arsenic-containing underground water can be effectively treated.

The application relates to a preparation method of a magnesium alloy surface super-hydrophobic coating, which comprises the following steps: (1) constructing a micro-arc porous magnesium oxide coating on the surface of the magnesium alloy through a micro-arc oxidation technology; (2) immersing the magnesium alloy with the micro-arc porous magnesium oxide coating on the surface in a ferrous ion solution, then carrying out hydrothermal treatment in pure water, and obtaining the magnesium alloy with Mg-Fe layered double hydroxide nanosheets on the surface; (3) immersing the magnesium alloy with the Mg-Fe layered double hydroxide nanosheets on the surface in the ferrous ion solution, self-assembling iron hydroxyl nanosheets on the Mg-Fe layered double hydroxide nanosheets, and obtaining the magnesium alloy with secondary micro-nano rough structures on the surface; and (4) carrying out thermal reduction treatment on the magnesium alloy with the secondary micro-nano rough structures on the surface in a reducing atmosphere, and obtaining the magnesium alloy with the super-hydrophobic coating on the surface.

[Problem] To provide: a method for producing precursor fine particles, the method being improved in productivity and quality stability of ε-type ferric oxide fine particles; a method for producing ε-type ferric oxide fine particles; and precursor fine particles. [Solution] This method for producing precursor fine particles can be used for the production of ε-type ferric oxide fine particles, and is characterized by including an irradiation step in which a ferric salt in a solvent 5 is irradiated with a femtosecond pulse laser to produce precursor fine particles P each containing iron hydroxide oxide. In the irradiation step, precursor fine particles P each containing ε-type iron hydroxide oxide may be produced. In the irradiation step, the ferric salt in the solvent 5 that contains an alcohol may be irradiated with the femtosecond pulse laser.

A method for preparing a polyamide nanofiltration membrane loaded with modified hydroxyl iron is disclosed, belonging to the field of nanofiltration membrane technology. The method solves the problems of low water flux, low interception rate, and easy shedding of the selective layer in existing nanofiltration membranes. Method: preparing hydroxyl iron functionalized with a silane coupling agent; preparing polyethyleneimine-modified hydroxyl iron; preparing a modified hydroxyl iron base membrane; and preparing a modified FeOOH nanofiltration membrane. The nanofiltration membrane of the present invention has higher water flux and retention rate because the introduced modified hydroxyl iron is loaded on the base membrane to form a scaffold, effectively preventing the polyamide layer from entering the base membrane and blocking the base membrane pores. The modified hydroxyl iron has a large number of hydrophilic groups, which can adsorb more aqueous phase monomers and facilitate subsequent interfacial polymerization reactions. At the same time, the grafted polyethyleneimine has a large number of amino groups that can react with acyl chloride groups, thereby increasing stability, preventing the selective layer from shedding, and increasing the crosslinking degree of the polyamide layer, forming a thinner and denser polyamide layer.

The present application relates to the field of composite materials, and particularly relates to a kind of doped graphene / hydroxyl iron oxide pressing agent, composition is: graphene+alpha-hydroxyl iron oxide+pressing agent, wherein pressing agent is: 30g PVA1788+4g AM+2mL AA.Preparation method is: step 1: weighing 30g PVA1788, 4g AM and 2mL AA configuration pressing agent;Step 2: 3 ‰ graphene and 5 ‰ alpha-hydroxyl iron oxide are added in the pressing agent of step 1, and a doped graphene / hydroxyl iron oxide pressing agent is prepared.The doped graphene / hydroxyl iron oxide pressing agent prepared by the present application is applied to the purification of radioactive aerosol in cooperation with ion wind.By experiment, it can be seen that the auxiliary effect of ion wind is very obvious, the pressing effect is more than 99% after 5min of sedimentation, and the pressing effect is more than 99.9% after 15min of sedimentation.

The application discloses a preparation method of a palladium-hydroxyl iron oxide (Pd-FeOOH) catalyst and application thereof, and belongs to the technical field of light-assisted zinc air batteries. In the method, cetyltrimethylammonium bromide is used as a structure directing agent, ferrous sulfate heptahydrate is used as an iron source, and sodium borohydride is used as a reducing agent under an acidic condition to prepare a nanosheet-shaped hydroxyl iron oxide carrier. Then, sodium tetrachloropalladate is used as a palladium source, and methanol is used as a sacrificial agent to load palladium on the surface of the hydroxyl iron oxide through an in-situ photodeposition method. The method has the following characteristics: by regulating the nanosheet structure of the hydroxyl iron oxide carrier and the in-situ deposition process of palladium, the uniform dispersion of the palladium active component on the surface of the hydroxyl iron oxide and the interface structure construction can be realized, the adsorption, activation and reduction capacity of the catalyst for oxygen molecules are improved, and the light-assisted oxygen reduction reaction performance of the catalyst is enhanced. The Pd-FeOOH catalyst prepared by the method is used for an air electrode of a light-assisted zinc air battery, and the oxygen reduction reaction performance of the air electrode can be effectively improved.