103results about How to "Improve electron transfer efficiency" patented technology

The invention discloses a water treatment method of zero-valent iron-copper bi-metal activated persulfate. The water treatment method specifically comprises the steps that bi-metals including zero-valent iron and copper are added into water containing micro-pollutants, then persulfate is added, full mixing is performed, the bi-metals including the zero-valent iron and the copper are utilized to activate the persulfate so as to remove the micro-pollutants in the water. The water treatment method utilizes the bi-metals including the zero-valent iron and the copper to efficiently activate the persulfate so as to produce free sulfate radicals having strong oxidizing property, can achieve the purpose of quickly and thoroughly removing micro-pollutants, including multiple types of poisonous and harmful micro-pollutants in water, such as polychlorinated biphenyl, brominated flame retardants, drugs and personal care products (PPCPs) and algal toxin, and has the advantages of high activation efficiency, high oxidation and degradation efficiency of pollutants, wide pH using range, convenient operation and the like. The water treatment method can be applied to underground water remediation, treatment of industrial water (including electroplating wastewater, hospital wastewater, printing and dyeing wastewater and the like), drinking water treatment, wastewater treatment and the like.

The invention discloses a making method of a graphene modified titanium oxide metal anticorrosion coating. The method comprises the following steps: preparing a graphene precursor solution, preparing a titanium oxide sol, preparing graphene modified titanium oxide powder, preparing a silane sol, making a composite coating, and making the metal anticorrosion coating. The thickness of the anticorrosion coating is 200-500nm. TiO2 particles in the graphene modified titanium oxide powder have uniform scales, and are uniformly distributed on a reduced graphene oxide layer, the crystal form structure of TiO2 is an anatase phase and brookite mixed crystal form, and the anatase phase and brookite mixed crystal form forms a compound energy zone structure, so the luminous energy utilization rate of titanium oxide is improved, the transfer path of electrons in the titanium oxide photocathode protection process is prolonged, the electron-hole recombination is reduced, and the photoinduced cathode protection effect of the coating is improved.

The invention discloses a method for treating water by using zero-valent iron-nickel bi-metal activated persulfate. According to the method, the zero-valent iron-nickel bi-metal activated persulfate is used, and micropollutants in the water are removed. The zero-valent iron-nickel bi-metal activated persulfate is used for efficiently generating high-oxidizing-property sulphate radical and high-oxidizing-property hydroxyl radical to attack the micropollutants, the micropollutants are degraded, and the purpose of quickly and thoroughly removing various poisonous and harmful micropollutants such as polychlorinated biphenyl, brominated flame retardants, medicines, personal care products (PPCPs) and algal toxin can be achieved. Compared with the existing the method for treating water by using zero-valent iron activated persulfate, the method has the advantages of high activating efficiency, high yield of the sulphate radical, high micropollutants removing efficiency and the like, is convenient and easy to operate, obvious in effect and wide in pH (potential of hydrogen) using range, and can be used for ground water remediation, treatment of industrial water comprising electroplating wastewater, wastewater of hospitals, printing and dyeing wastewater, treatment of drinking water, treatment of sewage and the like.

The invention discloses a preparation method of a sulfide-graphene composite material photoelectric catalyst. The preparation method comprises the following steps: first, dispersing graphene oxide powder in water to obtain a graphene oxide dispersion liquid; then, adding soluble metal salt into the dispersion liquid, stewing the liquid, washing precipitates, and drying and grinding the precipitates to obtain metal ion-doped graphene oxide powder; dispersing the powder into deionized water again, stirring the powder, adding a sulfide precursor salt solution, adding thiourea, stirring the materials, obtaining a reaction product according to a one-step hydrothermal method, naturally cooling the product to room temperature, centrifugally washing the reaction product, and drying the product toobtain solid powder. The preparation method of a sulfide / graphene compound is simple; metal ions are used as an interface connection agent for sulfide and the surface of the graphene and a seed layerfor sulfide growth, so that uniform dispersion of a sulfide sheet layer is promoted, and stacking of the sulfide sheet layer is inhibited; a large specific surface area can provide a plurality of active sites, so that the catalysis performance of a composite material is effectively improved.

The invention provides a laser-enhanced three-dimensional micro-region electro-deposition method. the method integrates laser irradiation into a microtubule-based micro-region electro-deposition device to obtain an improved deposition rate. Electrolyte is poured into an electrolyte chamber and a microtubule, a tip of the microtubule is close to a sample surface by the regulation of a translation stage, a droplet at the tip of the microtubule forms a meniscus on the sample surface so that the diffusion of the droplet on the sample surface is limited, and machining accuracy of electro-depositionis beneficially controlled. As the electrolyte in the microtubule is connected with the positive potential and the surface of a conductive sample is the negative potential, the electro-deposition process can occur. The laser is irradiated on the contact surface between the droplet and the sample, and a laser thermal effect improves the electron transfer efficiency in the electrolyte, acceleratesthe positive shift of the electrochemical balance potential and causes local eddy current stirring in the droplet, and therefore accelerates the electro-deposition process. According to the preset pattern, the electronic control transition stage movement is regulated, so the three-dimensional relative movement of the microtubule and the sample surface is realized.

The present invention is a kind of biosensor for quickly detecting glutamate-pyruvate transaminase. The biosensor is made through micro electromechanical processing process to form metal film electrodes and modifying the surface of the film electrodes with one layer of oxidation reduction polymer film as electronic medium to transfer electron between enzyme and electrode surface. The biosensor of the present invention has short response time and high sensitivity, and may be used in the quick detection of glutamate-pyruvate transaminase in fluid medium, such as blood, blood serum, urea, etc.

The invention provides a method for promoting the startup of an anaerobic reactor, and belongs to the field of anaerobic biological treatment of wastewater. The method comprises the following steps: (1) performing mixed culturing on a conductive particle dispersion and anaerobic activated sludge to prepare compound anaerobic activated sludge; and (2) inoculating the anaerobic reactor with the compound anaerobic activated sludge obtained in step (1) at a concentration of 5-15 gVSS / L, and intensifying the startup of the reactor, wherein the conductive nanoparticles are an electrical non-biotoxicmaterial. The conductive nanomaterial is compounded with bacteria in an anaerobic sewage treatment system in the method to enhance the metabolism of anaerobic bacteria, and the introduction of the conductive particles effectively improves the anaerobic reactor's ability to cope with high organic load, enhances the stability in the startup process of the reactor, and promotes the startup of the reactor.

The invention relates to a strong-basicity ternary composite metal-graphene-ion exchange resin material and a preparing method thereof to mainly solve the problems that in the prior art, strong-basicity ion exchange resin is poor in heat resistance and swelling resistance and likely to be decomposed and deactivated when heated in the application process. The strong-basicity ternary composite metal-graphene-ion exchange resin material is prepared from, by weight, 75-90% of polymerized monomers, 5-15% of copolymer monomers, 0.1-10% of graphene, 0.1-1% of metal particle components and 0.1-10% of an initiator. According to the technical scheme, the problems are well solved, and the strong-basicity ternary composite metal-graphene-ion exchange resin material can be used for industrial production of strong-basicity composite ion exchange resin materials.

The invention relates to a composite film electrode and a preparation method thereof. The electrode is a graded porous nano composite film which is composed of an insulating substrate, a first binding layer, a conductive gold layer, a second binding layer and a modified aluminum layer, wherein small holes with a hole diameter of 2-20 nm are uniformly distributed on the conductive gold layer according to a distribution density of 1010 / cm2-1012 / cm2, and the small holes with the hole diameter of 20-400 nm are uniformly distributed on the second binding layer and the modified material layer according to the distribution density of 109 / cm2-1012 / cm2; and the preparation method of the electrode comprises the following steps of: firstly, preparing a multi-layer composite film on the insulating substrate, then, performing anodizing and hole enlargement on the multi-layer composite film to implement that an aluminum layer becomes a porous alumina layer, a gold layer becomes a nano porous structure, the second binding layer becomes a porous oxide of tantalum, niobium or titanium, and cleaning and drying the multi-layer composite film to get a finished product of the graded porous nano alumina / gold composite film electrode. The graded porous nano alumina / gold composite film electrode has high in electroanalytical activity and the dual advantages of a nano porous gold and a porous anodizedaluminum; and the preparation method is simple and reliable, solves the defect of inconvenience in operation caused by high brittleness of an AAO, and fits for mass production.

The invention discloses a preparation method of a nanometer cobalt oxide / graphene composite material. A surface active agent is dissolved into water, graphite is added, after 10 to 50 hours of ultrasonography, the rotational speed is controlled to be 4000 to 5000 r / min and the centrifugation is performed for 10 to 30 min, cobalt salt is added into an obtained supernatant fluid, stirring is unceasingly performed for 20 to 30 min, and a solution A is obtained; a urea water solution with the concentration of 1-5 mol / L is dripped into a solution A, then the temperature is controlled to be 90 to 180 DEG C for reaction for 5 to 15 hours, an obtained reacting liquid is naturally cooled to be at the room temperature and then centrifugation is performed, after washing, precipitates are treated through vacuum drying, then under the protection of inert gas, and the temperature is risen at a speed of 1 DEG C / min and under the protection of inert gas to be 400 to 500 DEG C for calcination for 3 to 5 hours, that is, the nanometer cobalt oxide / graphene composite material is obtained. According to the preparation method provided by the invention, the reaction conditions are mild, oxidation of a strong oxidant is not used, the prepared graphene is less in defects, and the catalytic performance is improved greatly.

The invention relates to the field of microbial power generation, in particular to a mixed flora and a purpose thereof, a microbial electrogenesis system containing the mixed flora, and a microbial fuel cell. Through construction of an engineered mixed flora, the characteristic of definite division of labor is realized; zymophyte 1 provides carrier riboflavin of electron transfer for the system; and zymophyte 2 converts most common cheap glucose into a small molecule acid and provides the small molecule acid for electrochemically active microorganisms, so that the spectrum of carbon sources of the electrochemically active microorganisms is expanded. According to the mixed flora and the purpose thereof, the microbial electrogenesis system containing the mixed flora and the microbial fuel cell, two zymophytes with different purposes are constructed by performing methods, such as genetic engineering alteration, on type strains of escherichia coli or bacillus subtilis-protokaryotic gram negative bacteria and gram-positive bacteria; and therefore, the spectrum of carbon sources of the microbial fuel cell is expanded and the electron transfer efficiency of the electrochemically active microorganisms is enhanced. A stable, reasonable and efficient functional mixed flora compound electrogenesis system is constructed from three important angles of a material flow, an energy flow and an information flow.

The invention discloses an electrochemical sensor of a DNA probe based on fluorescein and sulfydryl modification. The electrochemical sensor comprises an electrode and a DNA probe, wherein the electrode adopts a three-electrode system, and the two ends of the DNA probe are respectively modified with the fluorescein and the sulfydryl; gold nanoparticles are deposited on the surface of a gold electrode, and the sulfydryl modified on the DNA probe is combined with the gold nanoparticles through a gold-sulfur bond; the gold nanoparticles and the fluorescein modified on the DNA probe can enable the DNA probe to form an arch-shaped structure through the surface adsorption action. The electrochemical sensor provided by the invention has the advantages that the gold nanoparticles are modified on the surface of the gold electrode through an electro-deposition effect, the nanogold modification can greatly increase the fixed carrying capacity of probe ssDNA of the surface of the electrode, and the probe forms the arch-shaped structure through the surface adsorption action of the nanogold on the fluorescein. The connection has high electron transmission efficiency, the change of the DPV signal before and after hybridization can be improved, and the detection sensitivity is improved.

A novel electrocatalyst made of an oxidase having high electron transfer efficiency and an enzymatic electrode using the same are provided. The electrocatalyst is made of CueO. The enzymatic electrode comprises a carbonaceous porous body and an electrocatalyst made of CueO supported on the surface of the carbonaceous porous body. CueO is preferably CueO from Escherichia coli. The carbonaceous porous body constituting the enzymatic electrode is preferably carbonaceous gel. Also, the enzymatic electrode may further comprise a mediator which facilitates transfer of electron between the carbonaceous porous body and said CueO.

The invention provides a composite electrode, a preparation method thereof, an application of the composite electrode and an electro-catalysis complete hydrolysis device, and relates to the technical field of complete hydrolysis. The composite electrode comprises a conductive substrate, a first active material layer and a second active material layer, the first active material layer is arranged at least part of surface of the conductive substrate to form a material containing a transition metal phosphide of the first active material layer, and the second active material layer is arranged at least part of surface of the first active material layer to form a material containing hydroxyl oxidation transition metal of the second active material layer. The composite electrode is low in cost, and electro-catalysis complete hydrolysis is efficiently and stably implemented by the aid of the composite electrode.

A light energy conversion material, comprising:a porous material including an electron donor in a skeleton thereof; andan electron acceptor disposed in at least one portion among a pore, the skeleton and the outer circumference of the porous material.

The invention belongs to the field of nano material preparation, and particularly discloses a tea polyphenol-modified graphene-loaded nano-iron material, and a preparation method and application thereof. The preparation method comprises the following steps: (1) adding FeSO4.7H2O to an ethanol solution so as to form a mixed solution; and (2) adding graphene to the mixed solution under closed conditions of protective gas, then adding a dispersant, performing ultrasonic dispersion, adding a tea polyphenol aqueous solution under a condition of stirring, carrying out a reaction, and performing filtration and vacuum drying so as to obtain the tea polyphenol-modified graphene-loaded nano-iron material. The prepared tea polyphenol-modified graphene-loaded nano-iron material is added to 250mL of ahexavalent chromium (Cr<6+>) solution with a concentration of 150 mg / L, the removal rate can reach 96-98% within 200 min through testing, and compared with existing adsorption materials, the tea polyphenol-modified graphene-loaded nano-iron material has an improved adsorption effect.

The invention discloses a siloxane-terminated polyether type lithium battery adhesive and a preparation method thereof. The preparation method comprises the following steps: 1) sequentially adding a solvent and cyanate into a reaction bottle, performing stirring and mixing, further adding a phase transfer catalyst, performing heating to 70-100 DEG C, and performing uniform constant temperature activation and dispersion for 30 minutes; and 2) respectively dropwise adding measured chlorosilane and polyether alcohol, or chlorosilane and polyester alcohol into the activation solution in the step 1), increasing the exothermic reaction temperature to 90-120 DEG C, maintaining the temperature range, performing a continuous reaction for 6-8 hours, after the reaction is completed, performing cooling to the room temperature, performing filtering so as to obtain filtrate, and removing the solvent, so as to obtain the siloxane-terminated polyether type lithium battery adhesive. The siloxane-terminated polyether type lithium battery adhesive disclosed by the invention is simple in preparation method, low in cost, high in efficiency, fast in adhesion and easy in industrialization. Prepared siloxane-terminated polyether for adhesion of lithium batteries is capable of improving the efficiency of the lithium batteries, high and low temperature resistance, stable charge and discharge efficiencyand bonding properties of the lithium batteries.

A method of transferring electrons with a light energy conversion material is described. The material includes a silica porous material having silicon atoms chemically bonded with an organic group that is an electron donor in a skeleton thereof, and an electron acceptor disposed in at least one portion among a pore, the skeleton and the outer circumference of the porous material. The method includes absorbing light energy by the organic group and transferring electrons excited by the light energy to the electron acceptor.

A preparation method of a Co3O4 / graphite felt composite electrode applied to an anodic oxidation system belongs to the technical field of electrochemical water treatment. With the graphite felt beinga substrate, cobalt acetate is supported thereon, and then the graphite felt is calcined at high temperature in air atmosphere to obtain a Co3O4-supported graphite felt; then at a certain high temperature, the Co3O4-supported graphite felt is calcined so that the graphite felt is etched by the Co3O4 to finally obtain the Co3O4 / graphite felt composite electrode. Compared with non-etched Co3O4-supported graphite felt composite electrode produced under same conditions, the Co3O4 / graphite felt composite electrode has higher oxidization effect.

The invention provides a silicon-based covalent organic framework photoelectrode and a preparation method and application thereof. The silicon-based covalent organic framework photoelectrode comprises a silicon substrate, and an electron conduction layer, a covalent organic framework layer and an electron mediator layer which are sequentially arranged on one side of the silicon substrate from bottom to top. According to the invention, the electron mediator is fixed on the covalent organic framework layer in a mode of forming coordinate bonds, electron transfer between the electron mediator and the covalent organic framework layer can be greatly promoted, and meanwhile, the photoelectrode is constructed into a stacked arrangement structure, so that efficient transfer of electrons between layers can be promoted; and finally, the electron transfer efficiency between the electron mediator and the silicon substrate is improved, and in-situ recovery and utilization of the electron mediator are realized. By means of the photoelectrode, the catalytic activity of photoelectrochemical coenzyme NAD (P) H regeneration can be effectively improved, meanwhile, the preparation method is simple and convenient, complex operation is not needed, and large-scale application in industrial production is facilitated.

The invention belongs to the technical fields of novel functional materials, immunoassay and biosensing and provides a preparation method and application of an immunosensor based on titanium dioxide-doped graphene-loaded trepan-shaped gold palladium core-shell nanoparticles. A marker-free electrochemical immunosensor is constructed by taking the titanium dioxide-doped graphene-loaded trepan-shapedgold palladium core-shell nanoparticles as a signal amplifying platform, so that the quantitative determination of ovarian cancer markers is realized, and the immunosensor has the advantages of strong specificity, high sensitivity, low detection limit and the like. The specificity has important scientific significances and application values in the detection of ovary diseases.

The invention discloses an enzyme-free electrochemical immunodetection system for KIM-1 protein in the technical field of protein detection, which comprises an upper-layer compound and a lower-layer compound, wherein the upper-layer compound is a PdPtBP mesoporous nano-particle / MXene nano-compound prepared by combining PdPtBP mesoporous alloy nano-particles and a Ti3C2TX MXene dispersion liquid, and a labeled antibody is combined on the PdPtBP mesoporous nano-particle / MXene nano-compound; the lower-layer compound is a modified electrode, the modified electrode is an electrode modified by CuCl2nanowires and gold nanoparticles, and a capture antibody is combined on the modified electrode; and the detection system is a PBS solution containing H2O2. According to the scheme, enzyme-free detection of protein is realized, and the problems of high detection cost, complex operation, low sensitivity, poor specificity and the like in the prior art are solved.

The invention discloses an electric-enhanced zero-valent-iron anaerobic water treatment device. The device comprises an up-flow anaerobic bioreactor, wherein an electric enhanced zero-valent-iron system is arranged in the middle of a barrel of the up-flow anaerobic bioreactor; the electric enhanced zero-valent-iron system comprises 2N electrodes formed by anodes and cathodes which are periodicallyarranged at intervals in the axial direction, wherein N is a positive integer; the anodes and the cathodes are connected with a direct-current power source outside the barrel through wires; and the space between every two adjacent electrodes are filled with a zero-valent-iron layer. According to the invention, on the basis of a zero-valent-iron coupling anaerobic reactor, a plurality of series orparallel electrodes are added, so that the over potential of a reaction is reduced, the electron obtaining rate of cathode microorganisms is accelerated, and the reduction reaction is promoted to berapidly carried out. An electric field is added, so that activity of the microorganisms can be stimulated, electron transfer between the electrodes and the microorganisms on the surface of the electrodes is facilitated, and the reaction rate of anaerobic zero-valent iron is enhanced to a greater extent.

The invention discloses a plant-SMFC system for electricity generation and algae-rich water body remediation and application equipment thereof. Plants in the system are hydrilla, the system comprisesa cathode and an anode which are made of graphite materials, the anode is located in bottom mud of a water body, the cathode is located in overlying water, a resistor is electrically connected betweenthe cathode and the anode, and the resistor is connected with an external electric appliance in parallel. The bottom mud contains sedimentary algae, and compared with other plants, the hydrilla can obviously enhance electricity generation capacity of the SMFC, so that a better synergistic effect is achieved. The equipment for planting the hydrilla can bring hydrilla seedlings to the surface of underwater bottom mud, the roots of the hydrilla seedlings can be inserted into the bottom mud, rapid and large-area hydrilla seedling planting is achieved, the difficulty of hydrilla seedling plantingis reduced, the roots of the hydrilla seedlings are inserted into the bottom mud, upward floating of the hydrilla seedlings is avoided, and the survival rate of the hydrilla seedlings is increased.

The invention discloses a high-power flexible single-enzyme glucose fuel cell and a preparation method thereof. According to the present invention, a three-dimensional semiconductor nano material Bi3Ti2O8F is prepared by using a hydrothermal synthesis method, and the Bi3Ti2O8F nanosheet is crosslinked and vertically grows, so that rich active sites are provided for fixing the glucose oxidase and transferring the electrons, and the electron transfer rate is obviously increased. A high-power flexible single-enzyme fuel cell is prepared by taking a flexible PTFE / rGO sheet prepared by a simple tabletting method as a biological cathode, the glucose oxidase as an anode catalyst, the Nafion / GOD / Bi3Ti2O8F / rGO as a biological anode and the glucose as a biofuel. The flexible glucose fuel cell disclosed by the invention is prepared by utilizing a single enzyme system without needing a diaphragm, and has a larger open circuit voltage and power density. The performance of the battery is measured inthe 75 mM glucose buffer solution, on the optimal condition, an output voltage is about 0.6 V, and the output power density of 650 [mu] W.cm <-2 >. The high-power flexible single-enzyme glucose fuelcell and the preparation method thereof are suitable for the fields of portable medical detection equipment and green renewable energy sources.

The invention provides a method for increasing the methane yield of sludge anaerobic digestion by utilizing an iron / carbon / biological enzyme coupling technology, which comprises the following steps: S1, weighing Baijiu koji, putting into a triangular flask, adding distilled water, carrying out constant-temperature water bath for 0.5-1.5 hours, then carrying out suction filtration by using quantitative filter paper, and screening out large-particle substances and part of mould and saccharomycetes to obtain a leaching solution for later use; s2, injecting sludge into an anaerobic reaction container, adding nano zero-valent iron, activated carbon and the Baijiu distiller's yeast leaching filtrate prepared in the step S1, continuously filling inert gas, removing oxygen, and sealing the reaction container; and S3, carrying out constant-temperature anaerobic digestion on the sealed reaction container. The reinforcer (nano zero-valent iron, activated carbon and distiller's yeast leaching liquor) adopted by the method is low in cost, cheap and easy to obtain, small in addition amount and low in operation cost, has a good application prospect, and solves the technical problems of low substrate conversion rate and low biogas yield in the anaerobic digestion process in the prior art.

The invention discloses a method and device for quickly detecting the content of theaflavin in black tea, and relates to a tea quality quick detection technology. According to the method, a cyclic voltammetry curve of black tea soup by adopting a taste sensor, a chemometric method is adopted to process the curve, extract a characteristic value, establish and optimize a model, so that theaflavin inblack tea can be quickly and quantitatively detected. According to the method and the device for quickly detecting the content of theaflavin in black tea, the experimental steps can be simplified, samples do not need complicated pre-treatment, and the detection cost is low.

The invention discloses a method for preparing an electrode material by graphene oxide and poly 3, 4-ethylenedioxythiophene. The method comprises the following steps of (1) immersing carbon felt in ahydrogen peroxide solution, performing constant-temperature reaction under 90 DEG C, washing the carbon felt with deionized water, and drying the carbon felt; (2) mixing a graphene oxide solution, 3,4-ethylenedioxythiophene solution and an electrolyte sodium sulfate solution, performing ultrasonic reaction to obtain an electrolyte suspension liquid, immersing the carbon felt in the electrolyte suspension liquid, performing immersion for 30 minutes under a room temperature, performing immersing for 2-3 hours under 40 DEG C, and performing electrodeposition; and (3) performing microwave reaction on the carbon felt for 5 minutes, and performing drying. The electrode material prepared by the method is compact and uniform in surface, the electrode is high in specific area and conductivity, lowin impedance and high in electron transfer efficiency, and has favorable biocompatibility, namely power generation performance.

The invention provides an in-situ synthesis method of a metal-loaded tungsten trioxide-based nano heterojunction material. The method comprises the following steps: 1, preparing blue tungsten oxide of which the surface layer contains reductive oxygen vacancies and pentavalent tungsten; and 2, growing metal nanoparticles on the surface of the blue tungsten oxide in situ by utilizing the reducibility of the blue tungsten oxide, so as to obtain the metal-loaded tungsten trioxide-based nano heterojunction composite material. The composite material synthesized through in-situ growth has a tightly-combined heterojunction interface, is high in electron transfer efficiency, can regulate and control an energy band, promotes charge separation and transfer, solves the problems of high recombination rate of tungsten trioxide photo-induced electrons and holes and low conduction potential of the tungsten trioxide, greatly improves the photocatalytic activity and stability of the material, and can be widely applied to the fields of photocatalytic solar fuel preparation, photocatalytic degradation of pollutants and the like.

The invention discloses a method for removing estradiol in tail water of a sewage treatment plant by using an Fe(III)-reinforced constructed wetland. A proper amount of Fe(III) (goethite or hematite) is added to a constructed wetland system, an Fe(III)-microorganism interaction system is constructed, the electron transfer efficiency of microorganisms is improved, and the capacity of the constructed wetland for removing the estradiol in the tail water of the sewage treatment plant is reinforced. The estradiol in the tail water of the sewage treatment plant is effectively removed by the aid of the constructed wetland, and eco-environment risks of recycling of the tail water of the sewage treatment plant are greatly reduced.