674 results about "Prussian blue" patented technology

The invention discloses a preparation method and application for preparing a cobalt-doped manganese dioxide material by taking Co3 [Co (CN) 6] 2 as a hard template, and belongs to the technical field of electrode material preparation. The preparation method comprises the following steps: firstly, preparing a Co3 [Co (CN) 6] 2 type Prussian blue nano cubic material through a liquid phase coprecipitation reaction method; and then preparing the cobalt-doped manganese dioxide material with a loose porous structure by taking the Co3 [Co (CN) 6] 2 type Prussian blue nano cubic material as a hard template and potassium permanganate as a reaction raw material and adopting a hydrothermal synthesis method, specifically, forming a submicron cube with the size of 200-700nm by combining nanosheets with the thickness of about 10-20nm, and preparing the cobalt-doped manganese dioxide material with the loose porous structure by adopting a hydrothermal synthesis method. And an optimization strategy of Co atom doping of manganese dioxide and nanosheet morphology control is synchronously completed. When the material is used as an electrode material, the conductivity of the manganese dioxide electrode material is greatly improved, the capacity of an aqueous zinc ion battery is improved, and the material has excellent charge-discharge cycle stability.

The invention belongs to the field of electrochemistry, and particularly relates to a method for electrochemical lithium extraction of a decommissioned lithium battery assisted by a pseudocapacitor cathode, which comprises the following steps: a) providing an anode electrode and a cathode electrode; the anode electrode is an anode electrode made of a recycled retired lithium battery anode material or an retired lithium battery anode plate; the cathode electrode contains a Prussian blue analogue, the Prussian blue analogue is prepared by mixing citrate, transition metal salt and cyanide in water for reaction, and the transition metal salt is one or more of cobalt salt, ferric salt, copper salt and nickel salt; and b) immersing the anode electrode and the cathode electrode into the electrolyte, and electrifying to carry out electrochemical lithium extraction. According to the method, a pseudocapacitance material with a lithium discharging characteristic is adopted as a cathode to replace a common metal pole plate or a carbon material, a pseudocapacitance reaction with a corrected electrode potential is adopted to replace a hydrogen evolution reaction on the cathode of an existing system, and finally, low-energy-consumption and high-selectivity recovery of lithium is realized.

The invention belongs to the technical field of novel energy storage battery materials, and particularly relates to a high-entropy Prussian blue positive electrode material as well as a preparation method and application thereof. The chemical formula of the positive electrode material is NaxM [Fe (CN) 6] y.mH2O (at) C, M comprises five different elements of Fe, Ni, Co, Mn, Zn, Ti, V or Cu, the molar ratio of the five different elements is 1: 1: 1: 1: 1-1: 3: 3: 3: 3, x is larger than 0 and smaller than or equal to 2, y is larger than 0 and smaller than or equal to 3, m is larger than 0 and smaller than or equal to 5, and the molar ratio of a carbon component to a high-entropy Prussian blue component is 1: 5-1: 10. Different physical and chemical properties of a plurality of metal elements are utilized, different transition metal elements are coordinated with cyano groups, respective advantages are exerted, the defects of a single metal element are overcome, a stable continuous transmission channel for sodium ions and electrons is constructed in a Prussian blue structure, and the performance of the Prussian blue is improved. Jahn-Teller distortion can be effectively inhibited through the synergistic effect of various metals, and the long cycle stability of the Prussian blue material is remarkably improved.

The invention discloses a Prussian blue type composite positive electrode material and a preparation method and application thereof, and the Prussian blue type composite positive electrode material provided by the invention is composite powder containing a Prussian blue type positive electrode material, a conductive agent, a binder and a functional additive, the mass ratio of the Prussian blue positive electrode material to the conductive agent to the binder to the functional additive is (90-99): (1-5): (0-5): (0-0.5). According to the Prussian blue composite positive electrode material provided by the invention, the components are uniformly distributed, the Prussian blue composite positive electrode material has the characteristics of high compaction, easy dispersion, relapse resistance, high conductivity and the like, and the Prussian blue composite positive electrode material can be directly used for wet homogenization and can also be directly used for dry electrode manufacturing.

The invention relates to ultra-small prussian blue nano-particles (T-USPB-C) carrying tirofian, a preparation method of the nano-particles and application of the nano-particles in preparation of drugs for reducing MVO and MIRI. According to the preparation method, the T-USPB-C is prepared by three steps. The T-USPB-C provided by the invention can carry tirofiban, and has catalase and superoxide dismutase simulated nano-enzyme activity. Moreover, the size of the nano-scale drug is required to reach a nano-scale size, and the drug can be efficiently cleared through kidney excretion, so that the potential long-term toxicity problem is minimized. The ultra-small prussian blue nanoparticle carrying the tirofian has an excellent active oxygen scavenging capability. Microvascular perfusion can be rapidly improved through the antithrombotic effect, then the protection effect is continuously achieved through the anti-oxidation and anti-inflammatory mechanism, and microvascular injury and MIRI are effectively prevented.

The invention relates to the technical field of supercapacitor electrode materials, in particular to an MXene composite material for a supercapacitor and a preparation method of the MXene composite material. The preparation method comprises the following steps: preparing an MXene nanosheet; the MXene nanosheet is put into a NaOH solution for alkali treatment; and mixing and stirring the alkalized MXene nanosheet, CuSO4. 5H2O and K3Fe (CN) 6, carrying out centrifugal washing, and drying in a vacuum drying oven to finally obtain the MXene composite material. The MXene is subjected to alkali treatment to enlarge the interlayer spacing of the MXene, and the MXene is compounded with the Prussian blue, so that the Prussian blue grows between the MXene layers and on the surface of the MXene, the interlayer spacing of the MXene is further enlarged, self-stacking of the MXene is inhibited, the conductivity of the Prussian blue is improved, and the electrochemical performance of the MXene-based supercapacitor electrode material is improved.

The invention discloses a Prussian blue analogue electrode and a preparation method and application thereof.The preparation method comprises the following steps that a manganese salt solution, a nickel salt solution and a potassium ferricyanide solution are prepared and added into water at the same time, a mixture with the molar ratio of manganese to nickel being larger than or equal to 0.1: 1 is obtained, aging, washing and drying are conducted, and the Prussian blue analogue electrode is obtained. And mixing the manganese-doped Prussian blue analogue with a binder, a conductive agent and a solvent, carrying out ultrasonic treatment to obtain an electrode slurry liquid, covering the surface of a current collector with the electrode slurry liquid, and drying to obtain the Prussian blue analogue electrode. The Prussian blue analogue electrode prepared by the method has the advantages of low energy consumption, high salt adsorption capacity, high salt adsorption rate and the like, can be used for desalting treatment as a capacitive deionization cathode, has the salt adsorption rate and the salt adsorption capacity which are more than two times of those of a conventional electrode, and is high in use value, good in application prospect and wide in application prospect. The method is of great significance in promoting wide application of the capacitive deionization technology.

The invention belongs to the field of wastewater treatment technology and energy conservation and environmental protection, and particularly relates to a preparation method and application of aerogel for selectively separating radionuclide cesium in water. The preparation method comprises the following steps: preparing graphene oxide by using a hydrothermal technology, preparing molybdenum disulfide / GO aerogel by using a hydrothermal synthesis and ultrasonic technology, and inlaying and growing Prussian blue (PB) on the surface of the aerogel, so that the problems that PB and MoS2 are easy to agglomerate and difficult to recover are solved, the GO aerogel is endowed with multiple functions, and the constructed PB / MoS2 / GO aerogel is used for selectively separating radionuclide cesium in water. The selective separation performance of the aerogel on the radionuclide cesium in water under different conditions is investigated, efficient enrichment and recovery of the radionuclide cesium are effectively realized by utilizing the ultralight and highly porous characteristics of the aerogel, and the application potential of the aerogel in the aspects of reducing secondary pollution and improving the environmental treatment effect is proved. An efficient and environment-friendly solution is provided for radionuclide wastewater treatment, and the method has a wide market application prospect.

The invention discloses a non-aqueous electrolyte additive for Prussian blue and analogues thereof, an electrolyte and a sodium-ion battery, and relates to the technical field of sodium-ion batteries, the non-aqueous electrolyte additive comprises a silane additive, the silane additive comprises a compound with a Si-O structure or / and a compound with a Si-N structure, in the silane additive, the silane additive comprises a compound with a Si-O structure and / or a compound with a Si-N structure, the mass ratio of the compound with the Si-O structure to the compound with the Si-N structure is (10: 0)-(0: 10), the mass percentage content of the electrolyte additive in the electrolyte is 0.5-10%, and compared with a contrast sample without the electrolyte additive, the electrolyte and the sodium ion battery prepared by using the electrolyte additive provided by the invention have the advantages that the charge-discharge rate of the contrast sample is 1C, the charge-discharge rate of the sodium ion battery is greatly improved, and the charge-discharge rate of the sodium ion battery is greatly improved. The first charge-discharge capacity and the cycle performance are obviously improved, and the capacity retention ratio is still 90% or above after 200 cycles.

The invention discloses a ferrate nanocage superstructure material and a preparation method and application thereof, the preparation method comprises the following steps: preparing a zinc-iron Prussian blue nanocube precursor material, then dispersing the precursor material in deionized water, and standing and aging for 24-120 hours at 15-45 DEG C to obtain a zinc-iron Prussian blue nanocage; the preparation method comprises the following steps of: dispersing in diluted hydrochloric acid, adding metal salt, uniformly stirring, standing and reacting for 6-48 hours at the temperature of 50-120 DEG C, filtering, washing, drying, and annealing for 1-5 hours at the temperature of 300-500 DEG C; according to the invention, the zinc-iron Prussian blue nanocube is used as a precursor, the zinc-iron Prussian blue nanocage is obtained through aging, and the ferrite nanocage superstructure material is prepared through ion exchange and has excellent gas-sensitive characteristic.

The invention relates to the technical field of nano-enzyme preparation and electrochemical and colorimetric dual-mode sensing, and particularly discloses a Mn3Fe2.7-atC nano-enzyme, a preparation method thereof and application of the Mn3Fe2.7-atC nano-enzyme in determination of amoxicillin content. The preparation method of the Mn3Fe2.7 at C nano-enzyme is characterized by comprising the following steps: dissolving manganese chloride and trisodium citrate in water to prepare a solution A; dissolving potassium ferricyanide in water to prepare a solution B; adding the solution B into the solution A under a stirring condition, continuously stirring for 16-32 hours after the solution B is added, carrying out suction filtration, and drying the obtained precipitate to obtain a ferromanganese prussian blue analogue precursor; and placing the ferromanganese prussian blue analogue precursor in a tubular furnace, carrying out pyrolysis, and after the pyrolysis is finished, carrying out acid soaking, washing and drying to obtain the Mn3Fe2.7 at C nano-enzyme. When the Mn3Fe2.7 (at) C nano-enzyme is used for measuring the content of amoxicillin, the accuracy is good, and meanwhile, the Mn3Fe2.7 (at) C nano-enzyme has the advantages of interference resistance, stability, good recovery rate and the like.

The invention provides a preparation method of a manganese-based Prussian blue sodium ion battery positive electrode material, which comprises the following steps: firstly, adding a mixed solution of a part of manganese salt and a chelating agent into a sodium ferrocyanide solution at a first flow rate in a protective atmosphere for reaction; and continuously adding the residual mixed solution of the manganese salt and the chelating agent into the reaction system in the previous step at a first flow rate, adding the mixed solution of the transition metal salt and the chelating agent at a second flow rate, reacting again, and aging to obtain the manganese-based Prussian blue sodium-ion battery positive electrode material. The chelating agent is used for assisting coprecipitation to synthesize the Prussian blue analogue coated manganese-based Prussian blue sodium ion battery positive electrode material with stable heterogeneous lattices, so that the volume change and particle cracking of the positive electrode material in the charging and discharging process can be effectively inhibited in the circulating process, and the structure collapse is prevented; the cycle stability of the positive electrode material in the charge-discharge process is effectively improved, and the cycle life of the battery is prolonged.

The invention discloses a preparation method of a Prussian blue analogue (CoFe-PBA) and copper metal organic framework (HKUST-1) composite core-shell material and application of the composite core-shell material in oxygen evolution reaction (OER). The material is prepared through a step-by-step synthesis and composite process: firstly, synthesizing copper-based MOF (HKUST-1) and a ferrocobalt Prussian blue analogue (CoFe-PBA), then compounding the copper-based MOF (HKUST-1) and the ferrocobalt Prussian blue analogue (CoFe-PBA) through a solvothermal method to form a core-shell structure (HKUST-1-atCoFe-PBA), and further performing high-temperature oxidation and vulcanization treatment to obtain HKUST-1-atCoFe-O and HKUST-1-atCoFe-S materials. According to the composite material, the electron transmission efficiency and the catalytic activity are remarkably improved by utilizing the synergistic effect of multi-metal active sites of Cu, Co and Fe. No precious metal or strong corrosive reagent is used in the preparation process, the cost is low, and the green synthesis requirement is met. An electrochemical test shows that the OER overpotential of the optimized catalyst at the current density of 10mAcm is only 268mV, and the catalyst shows excellent catalytic performance. The material can be widely applied to the fields of water electrolysis hydrogen production and the like, and has important industrial application prospects.

The invention discloses a method for preparing a sodium-rich boundary-rich iron-based prussian blue analogue (FePBA) through one-step hydrothermal synthesis assisted by sodium thiosulfate. The method specifically comprises the following steps: preparing a solution A and a Na4Fe (I I) (CN) 6 solution; the molar ratio of ferrocyanide to Fe ions in the solution B is 3: 4. And preparing a solution B to react with ferrocyanide to form FePBA. Adding sodium citrate to form a sodium and citrate-rich environment, then adding ferric iron salt, and fully stirring to chelate the added Fe < 3 + > with the citrate; and adding sodium thiosulfate after the step. Preparing a PVP (Polyvinyl Pyrrolidone) solution to play roles in dispersing FePBA and reducing agglomeration, and taking the PVP solution as a solution C; slowly dropwise adding the solution A and the solution B into the solution C at a constant speed by using a rubber head dropper to finally obtain a precursor solution, carrying out hydrothermal reaction for 6 hours at 110 DEG C, carrying out suction filtration on the obtained precipitate, and drying to obtain a FePBA sample. According to the invention, the time required for synthesis is greatly shortened, and the traditional coprecipitation of more than 24 hours is improved into rapid hydrothermal reaction of 6 hours.

The invention discloses a method for detecting glucose on the basis of cascade catalysis of cerium dioxide / gold nano cluster-Prussian blue nano enzyme (AuNCs-CeO-HMPB). The material is prepared by compounding cerium dioxide (CeO) with similar glucose oxidase activity and hollow Prussian blue nanoparticles (AuNCs-HMPB) modified by gold nanoclusters with similar peroxidase activity through a hydrothermal assembly method. In the presence of glucose, CeO catalyzes oxidation of glucose to generate gluconic acid and H2O2, then AuNCs-HMPB synergistically catalyzes decomposition of newly generated H2O2 to generate high active oxygen species, further a colorless 3, 3 ', 5, 5'-tetramethyl benzidine (TMB) color developing agent is oxidized to generate obvious color change, and based on the cascade catalytic reaction, the enzyme-free glucose colorimetric sensor is successfully constructed. The sensor shows excellent detection performance on glucose under optimized conditions (pH = 4.0, 50 DEG C), the linear detection range is 10.00-90.00 [mu] mol / L, and the detection limit is 2.1 [mu] mol / L (S / N = 3).

The invention relates to a method for rapidly preparing a negative electrode of a lithium and sodium ion battery from a waste sodium electrode plate. Comprising the following steps: (1) respectively disassembling a Prussian blue positive pole piece, a hard carbon negative pole piece and a diaphragm in a sodium-electricity waste soft package, and soaking in deionized water; (2) respectively standing the solution obtained in the step (1), centrifuging, and drying in a blast oven; (3) directly tabletting the Prussian blue positive electrode powder dried in the step (2) and a diaphragm, preparing a slurry from the hard carbon negative electrode powder and sodium alginate with the concentration of 2% according to a ratio of 98: 2, and drying in a vacuum oven at 90 DEG C for 12 hours; the problem that the waste soft package of the sodium battery is difficult to recycle is solved. The obtained negative electrode material realizes electrochemical performance close to that of a fresh negative electrode under the carbonization of a rapid Joule heat means.

The invention belongs to the technical field of cultural relic protection, and particularly relates to a preparation method of an antibacterial hydrophobic coating for stone cultural relic protection. According to the method, an attapulgite / copper-iron prussian blue analogue / silver nano composite material is synthesized by adopting a simple wet chemical method and an electrochemical replacement method, in the preparation process, natural nano rodlike mineral attapulgite is used as a carrier, and prussian blue analogue nano particles are loaded on the surface of the carrier by adopting an in-situ precipitation method; the antibacterial property of the natural mineral material is effectively improved; furthermore, nano Ag is used for modifying the Prussian blue analogue, so that the killing effect of the composite material on bacteria and fungi can be effectively enhanced, the photo-thermal performance of the Prussian blue analogue can be improved, and the purpose of long-acting bacteriostasis is achieved; and finally, carrying out hydrophobic treatment on the coating by using fluorinated silane to obtain the antibacterial hydrophobic self-cleaning coating for protecting the stone cultural relics.

The invention discloses a preparation method of an electrochemical sensor based on laser-induced graphene / molecularly imprinted polymer, which comprises the following steps: preparing three electrodes of a graphene pattern through laser induction, electro-depositing Prussian blue on an LIG electrode to serve as a redox medium, electro-depositing a molecularly imprinted polymer to serve as an identification original, and preparing the electrochemical sensor based on the graphene / molecularly imprinted polymer. The sweat detector is used for detecting non-electroactive substances in sweat. The sensor adopts a sensing mode of linear voltammetry, and can detect trace element pyridoxine molecules in sweat with high sensitivity. The molecularly imprinted polymer is called as an artificial antibody, shows extremely high sensitivity and selectivity, can monitor different substances by replacing template molecules, and is high in sensitivity and low in detection limit. The preparation method provided by the invention has the characteristics of simple process, low cost, high selectivity, high sensitivity and low detection limit.

The invention provides a rubidium and cesium adsorbent and a preparation method and application thereof. The preparation method comprises the following steps: providing a doped and modified Prussian blue analogue, wherein the Prussian blue analogue comprises a Prussian blue matrix material and a transition metal doping element doped in the Prussian blue matrix material; granulating a mixed material containing the doped and modified prussian blue analogue and a granulating agent to obtain a rubidium and cesium adsorbent precursor; a mixed reaction system containing the rubidium and cesium adsorbent precursor and a surface modifier are subjected to a reaction, the surface modifier contains one or more functional structures of an amino group, a sulfonic group, a carboxyl group, a sulfydryl group, an acryloyloxy group, an epoxy group, a crown ether structure and a calixarene structure, and therefore the rubidium and cesium adsorbent is obtained. Through a multi-aspect synergistic strategy of transition metal doping, granulation and surface modification, the prepared rubidium and cesium adsorbent has good stability and high adsorption capacity, and has strong selectivity to Cs < + > / Rb < + >.

The invention discloses a spherical Prussian blue material as well as a preparation method and application thereof. The preparation method comprises the following steps: enabling a mixed reaction system containing soluble transition metal hexacyanoid salt, soluble transition metal salt, a complexing agent, soluble sodium salt, a surfactant and a carbon sphere precursor to react, and then selectively performing or not performing aging treatment to prepare the spherical Prussian blue material. According to the preparation method provided by the invention, the spherical Prussian blue material is obtained by regulating and controlling the reaction raw materials and the reaction steps, so that the rate capability and the cycle stability of the Prussian blue material are improved, and the problem that the compaction density and the compaction density are reduced due to the fact that the rate capability of a Prussian blue cube is improved due to carbon coating is solved.

The invention relates to an oxsalazine-loaded hollow mesoporous prussian blue / polydopamine nano-enzyme as well as a preparation method and application thereof, and belongs to the technical field of material synthesis and molecular biology. Osalazine is loaded in hollow mesoporous Prussian blue (HMPB), and the surface of the hollow mesoporous Prussian blue is coated with a polydopamine layer. The composition is used for promoting IBD treatment. The drug loading system has good peroxidase activity, can quickly release drugs in an inflammatory environment for a long time, plays effective anti-inflammatory and anti-oxidation roles in IBD treatment, and has good biological safety.

The invention discloses manganese-based Prussian blue-polyacrylic acid / polyvinyl alcohol hydrogel for preventing and treating allergic rhinitis. Monodisperse manganese-based Prussian blue nanoparticles synthesized by taking polyacrylic acid as a template are stably immobilized in a polyacrylic acid / polyvinyl alcohol hydrogel matrix. The obtained composite hydrogel membrane has the following prominent advantages: the composite hydrogel membrane has excellent hydrogel characteristics, including controllable membrane thickness, good tissue adhesion and air permeability; reliable biocompatibility and safety are shown; allergen permeation is effectively blocked through a physical barrier effect; prussian blue is continuously released in the slow-release degradation process, active oxygen free radicals are remarkably removed, and the powerful anti-inflammatory effect is achieved. Due to the synergistic effect of double mechanisms of protection and treatment, the material has important clinical application value and development potential in the fields of prevention and treatment of allergic rhinitis.

The invention discloses a two-dimensional Co-Fe Prussian blue analogue catalytic membrane as well as a preparation method and application thereof, and belongs to the technical field of catalytic membrane degradation treatment of environmental organic pollutants. The two-dimensional Co Fe PBA nanosheets are fixed to the hydrophilic polytetrafluoroethylene membrane modified by polydopamine in a vacuum filtration mode, the stability of the material is improved, the leaching rate of metal ions of the Co Fe PBA nanosheets is reduced, and the two-dimensional flaky Prussian blue analogue catalytic membrane is promoted to activate PAA to catalyze organic pollutants. The prepared two-dimensional flaky Prussian blue analogue catalytic membrane can treat different organic pollutants, is high in structure and performance stability and wide in pH application range, has high tolerance to complex water bodies, can be expected to be applied to continuous and efficient treatment of actual water bodies, and has wide application prospects. And new opinions and possibilities are provided for the treatment of environmental pollutants.

The invention relates to a fluorescently-labeled Prussian blue nano-particle as well as a preparation method and application thereof, the fluorescently-labeled Prussian blue nano-particle is prepared, and a carboxyl functional group is reserved on the surface of the nano-particle and is used for being subsequently coupled with an antigen or antibody molecule through a covalent bond. The nano material can provide colorimetric and fluorescent dual-mode detection functions, is beneficial to enhancing the detection sensitivity of an immunochromatography technology, and meanwhile, retains the detection convenience. The material is simple in preparation method, low in cost and easy for large-scale production and application.

The invention relates to a negative active material and a preparation method thereof, a negative pole piece and a sodium ion battery. The negative electrode active material comprises a core-shell structure metal phosphide, and the core-shell structure metal phosphide comprises: an inner core, which comprises a bimetal phosphide derived from a Prussian blue compound; the shell layer covers at least part of the surface of the inner core, and the shell layer comprises metal phosphide. According to the negative electrode active material provided by the invention, through the synergistic effect of the bimetal phosphide derived from the Prussian blue compound in the inner core and the metal phosphide of the shell layer, the cycle performance and the rate capability of the battery are improved.

The invention discloses a method for preparing a Prussian blue compound through a lateral growth mechanism, and belongs to the technical field of material preparation. On the premise of not changing the overall frame structure of the existing Prussian blue, the low-potential Prussian blue compound FeR [Fe (CN) 6] with different nickel substitution amounts is obtained by adjusting the types and contents of transition metal elements and substituting atoms bridged with cyanide ions. According to the present invention, by using the anisotropy of the compound, the formation of the cubic phase crystal structure through the lateral growth mechanism is clarified from the atomic level, the preparation of the Prussian blue compound can be completed within a short time through the thermodynamic and dynamic condition setting, and the method has characteristics of no toxicity, no harm, no excess impurity generation, and increase of the synthesis yield;

The invention discloses a soluble double-layer microneedle patch loaded with an LL37-coated ZIF-8 and Prussian blue nano-enzyme pharmaceutical composition and application, and belongs to the technical field of biomedical materials. The soluble double-layer microneedle patch provided by the invention comprises a needle body layer and a backing layer, the needle body layer comprises a pullulan polysaccharide matrix, LL37 (at) ZIF-8 and a Prussian blue nano enzyme; and the backing layer comprises a pullulan polysaccharide matrix. According to the preparation method, pullulan, LL37 ZIF-8 and Prussian blue nano enzyme (PB) are combined for use, so that the soluble double-layer microneedle patch integrating efficient antibiosis, continuous antioxidation, healing promotion and biocompatibility can be obtained, and the application performance is good; and the preparation method has the advantages of mild reaction conditions, simple preparation, low raw material price, easiness in batch production and manufacturing and the like, and is easy for large-scale production.

The invention belongs to the technical field of antibacterial materials, and particularly relates to a nano composite antibacterial agent for in-situ growth of a silver ion modified Prussian blue analogue on attapulgite as well as a preparation method and application of the nano composite antibacterial agent. According to the method, the attapulgite-silver ion modified prussian blue analogue nano composite antibacterial agent is synthesized by adopting a simple wet chemical method and an electrochemical replacement method, in the preparation process, natural nano rod-like mineral attapulgite is used as a carrier, and nano particle prussian blue and the nano rod-like attapulgite are combined by adopting an in-situ precipitation method; the antibacterial property of the natural mineral material is effectively improved; furthermore, the composite material is modified through silver nitrate by using an electrochemical replacement method, so that the killing effect of the composite material on bacteria and fungi can be effectively enhanced, and the purpose of long-acting bacteriostasis is achieved.

The invention provides a selective adsorption thallium removal agent and a preparation method thereof, and belongs to the technical field of adsorption materials. The thallium removal agent provided by the invention comprises bentonite and Prussian blue loaded on the bentonite, the mass of the Prussian blue accounts for 10-30% of the mass of the bentonite, the crystal space after the bentonite absorbs water and expands is fully utilized, and Prussian blue nanoparticles are uniformly dispersed between layers and on the surface of the bentonite, so that the thallium removal agent is prepared. The adsorption sites of Prussian blue and bentonite are fully exerted, and the adsorbability of thallium ions in wastewater is greatly improved.