63 results about "Lead dioxide" patented technology

The invention discloses a lead-sodium storage battery positive electrode lead paste in the technical field of storage batteries. The lead-sodium storage battery positive electrode lead paste comprises the following components in parts by weight: 100 parts of lead oxide powder, 6-10 parts of sulfuric acid, 14-24 parts of deionized water, 0.05-0.07 part of short fibers, 2-8 parts of lead dioxide, 1-2 parts of tetrabasic lead sulfate, 0.5-1.5 parts of calcium sulfate, 0.05-0.15 part of stannous sulfate, 0.05-0.15 part of antimony trioxide, 0.5-1 part of carbon black, 0.1-0.2 part of carboxymethyl cellulose sodium and 0.1-0.5 part of a mixed carbon material. By improving the design of the process, the formation efficiency and low-temperature performance of the storage battery can be effectively improved, and the service life of the storage battery can be effectively prolonged.

The invention relates to a water-soluble plumbic acid static storage battery. The battery comprises a battery monomer, the battery monomer comprises an electrode plate, a static electrolyte and a container, the electrode plate is inserted in the electrolyte, the electrolyte comprises water-soluble lead salt, acid and water, and the battery monomer further comprises a lead dissolving agent or a structure extending the bottom end of a negative plate to the position below a positive plate. The lead dissolving agent can provide at least one water-soluble redox couple R oxidation and R reduction, and the redox couple electrode potential meets E theta (Pb < 2 + > / Pb) lt; e [theta] (R oxidation / R reduction) [lt]; e theta (PbO2 / Pb2 +). No diaphragm exists, the electrolyte is in a static state, facilities such as a circulating pump are not needed, lead ions are allowed to migrate under the concentration gradient effect, and meanwhile self-discharge caused by convection shuttling of the lead dissolving agent is greatly reduced. In the charging process, lead and lead dioxide can be flatly deposited on the surface of an electrode and can be completely dissolved in the discharging process, the cycling stability is good, and the components can be kept stable for a long time.

The invention relates to the field of sewage treatment, and discloses a sewage treatment method based on desulfurization and denitrification, which comprises the following steps: S1, magnetic flocculation-electro-catalysis pretreatment: adding a polyaluminum chloride-magnetic powder composite flocculant into sewage through a magnetic flocculation reactor to form a magnetic floc, removing suspended matters through a permanent magnetic separation device, and then entering an electro-catalysis oxidation pond, carrying out electrolysis by taking titanium-based lead dioxide as an anode and active carbon fiber as a cathode; and S2, performing synchronous desulfurization and denitrification on the three-dimensional electrode fluidized bed, feeding pretreated effluent into a three-dimensional electrode fluidized bed reactor, filling activated carbon particles as a third electrode, and adding a composite flora of thiobacillus and denitrifying bacteria. The efficient removal of sulfides, total nitrogen, total phosphorus and chemical oxygen demand in the sewage is realized through a multi-stage synergistic process of magnetic flocculation-electrocatalysis pretreatment, synchronous desulfurization and denitrification of a three-dimensional electrode fluidized bed, deep denitrification and dephosphorization of a denitrification filter tank and catalytic ozonation-membrane separation combined deep treatment.

The invention discloses a green continuous production process of electrolytic manganese dioxide, which comprises the following steps: mixing a manganese-containing raw material and sulfuric acid according to a mass ratio of 1: (1.2-1.5), and then carrying out acid leaching at 80-90 DEG C for 2-3 hours to improve the manganese leaching rate to 91-98%; 10-15% hydrogen peroxide oxidation is combined with accurate regulation and control and flocculent precipitation of pH 5-6, so that the iron impurity residue is less than or equal to 5 ppm; in the electrolysis process, sulfuric acid is continuously supplemented to maintain the concentration of 150-180 g / L, the titanium-based lead dioxide anode and the stainless steel cathode are matched, and the current efficiency is 88-91.5%; and carrying out three-stage countercurrent washing and drying at 120-130 DEG C on the product to obtain the electrolytic manganese dioxide with the purity of more than or equal to 93%. The process provided by the invention is suitable for resource utilization of low-grade pyrolusite, and the obtained product is mainly used in the fields of lithium-manganese battery positive electrode materials, magnetic materials and catalyst carriers.

The invention discloses a method for improving copper electrodeposition quality, which belongs to the technical field of copper electrodeposition, and comprises the following steps: preparing a copper sulfate electrodeposition solution; adding a composite additive consisting of an extracting agent, thiourea or / and chloride ions into the copper electrodeposition solution, uniformly mixing, and conveying into an electrodeposition tank; the Pb-Sn-Ca anode plate is placed in a pretreatment solution to be subjected to activating treatment, and a uniform and compact lead dioxide coating is formed on the surface of the Pb-Sn-Ca anode plate; a plurality of activated Pb-Sn-Ca anode plates and 316L stainless steel cathode plates are alternately arranged in an electrodeposition cell at intervals, the whole electrodeposition cell is placed in a bath type ultrasonic wave generating device for electrodeposition treatment, an electrodeposition copper sheet is obtained, and cell voltage is recorded. According to the invention, an anode plate pretreatment activation process is adopted, a composite additive is added to optimize an electrode liquid formula, and an ultrasonic strengthening means is supplemented, so that the current efficiency in the copper electrodeposition process is improved, and the copper electrodeposition surface appearance and roughness are effectively improved.

The invention provides a plating bath for preparing a titanium-based lead dioxide electrode through electro-deposition and a preparation method of the plating bath, and relates to the field of plating baths, and the plating bath comprises lead p-toluenesulfonate, p-toluenesulfonic acid, fluoride of alkali metal and a dopant. The titanium-based lead dioxide electrode plating bath selects lead p-toluenesulfonate as a main salt and p-toluenesulfonic acid as an acid source, on one hand, the p-toluenesulfonic acid has a weak complexing effect and can form a complex with lead ions in the plating bath, the polarization effect of electro-deposition is increased, the compactness of a lead dioxide electro-deposition layer is improved, and the electrode stability is improved; on the other hand, p-toluenesulfonic acid serving as a hydrophilic organic molecule containing a large-pi conjugated system can be adsorbed on the surface of a lead dioxide crystal, growth of the lead dioxide crystal is regulated and controlled, electrodeposition distortion and internal stress of a lead dioxide active layer are reduced, and the accelerated life of an electrode is prolonged; and meanwhile, the p-toluenesulfonic acid can promote the dominant growth of beta-PbO2 with high catalytic activity, and is beneficial to improving the electrocatalytic activity of the titanium-based lead dioxide electrode.

The invention belongs to the technical field of adsorption materials, and particularly relates to a hydroxyl-free lead dioxide-based nitric oxide absorbent and a preparation method thereof. The method comprises the following steps: preparing a mixed solution of perchloric acid and lead perchlorate, standing to form a saturated solution, and performing electrodeposition by using the saturated solution as an electrolyte to obtain a lead dioxide deposition layer; and cleaning, drying and crushing the sediments, drying the sediments in an air dry oven with an air exchange function, and calcining the sediments at high temperature to form a target product. The obtained absorbent has the characteristics of hydroxyl-free structure, nanoscale particle size, high porosity, excellent adsorption performance and the like. Test results show that the absorbent has good selective adsorption capacity on NO2, and the adsorption efficiency can reach 85% or above. The material is suitable for nitrogen oxide interference absorption in the determination process of the hydrocarbon content in coal, and has important application value.

This invention relates to a method for preparing a composite electrode for electrochemical oxidation of antibiotics, belonging to the technical field of electrode materials for electrochemical wastewater treatment. The method is characterized by the uniform distribution of carbon nanotubes containing lead dioxide nanospheres on the surface of a boron-doped diamond film grown on a silicon substrate. The preparation method includes: growing a boron-doped diamond film on the silicon substrate surface, preparing carbon nanotubes containing lead dioxide nanospheres, and preparing the composite electrode by spin-coating. This invention designs a PbO2 nanostructure with more active sites to improve electrochemical activity, resulting in a fast degradation rate and high removal rate for antibiotic wastewater, while preventing water pollution caused by residual PbO2 during the degradation process. It has significant practical application value.

The manufacturing method of the disclosed interface-enhanced anode plate comprises the following steps: carrying out sand blasting and acid pickling on the surface of the doped titanium substrate; snSO, HSO, gelatin and thiourea are selected as deposition liquid, electro-deposition is conducted on the surface of the doped titanium substrate, and ZnSO is added into the deposition liquid to continue electro-deposition; an electrolyte containing NHF and citric acid is selected, the workpiece is used as an anode to be subjected to oxidation treatment in the electrolyte, then the workpiece is placed in alkali liquor to be subjected to alkali etching treatment, and finally the workpiece is subjected to thermocuring treatment. Pb (NO), nanometer TaO5, Cu (NO). 3HO and PVP-K30 are selected as deposition liquid, and electro-deposition is carried out on the surface of a workpiece. The disclosed titanium-based lead dioxide anode plate sequentially comprises a doped titanium substrate, a SnO intermediate layer and a nano-modified beta-PbO active layer from inside to outside, the SnO intermediate layer and the doped titanium substrate are combined to form a first enhanced interface, and the SnO intermediate layer and the nano-modified beta-PbO active layer are combined to form a second enhanced interface. The anode plate has higher coating bonding strength and longer service life.

The invention discloses a method for detecting lead plaster components of a waste lead-acid storage battery. The invention relates to the technical field of waste storage battery resourceful treatment and detection, the method comprises preparation and calibration of an EDTA standard solution, and continuous determination of the content of lead oxide, lead sulfate, metal lead and lead dioxide in lead plaster, through use of formic acid, ammonium carbonate and other reagents and combination of an ultrasonic-assisted extraction technology, the dissolution efficiency is significantly improved, and the content of lead oxide, lead sulfate, metal lead and lead dioxide in the lead plaster is determined. The reaction time is greatly shortened; the selective dissolution of the metal lead is realized by accurately controlling the low-temperature condition and the reaction time, and the interference of lead dioxide is effectively avoided; according to the method, by optimizing a reagent system and introducing ultrasonic-assisted extraction, the dosage of strong acid and the emission of toxic wastes are greatly reduced, the method is more environment-friendly while the result accuracy is ensured, and the method is clear in operation flow, good in reproducibility and suitable for rapid and reliable determination of the components of the lead paste in an industrial recovery scene.

The present application relates to a kind of U-shaped titanium copper clad aluminum base lead dioxide composite anode plate for non-ferrous electro-deposition and preparation method thereof, belong to hydrometallurgy technical field.The composite anode plate of the present application includes titanium copper clad aluminum rod conductive beam, transition titanium copper clad aluminum plate, U-shaped titanium copper clad aluminum rod manganese dioxide composite anode and longitudinal conductive reinforcing rib, titanium copper clad aluminum rod conductive beam and transition titanium copper clad aluminum plate include secondary aluminum layer, copper layer and titanium layer from inside to outside in sequence;U-shaped titanium copper clad aluminum rod manganese dioxide composite anode rod and longitudinal conductive reinforcing rib include titanium copper clad aluminum rod matrix, tin-sb-bi-ce-nickel composite oxide Sn-Sb-Bi-Ce-NiO x bottom layer, manganese-cerium-copper composite oxide Mn-Ce-CuO x Middle layer and cerium-doped-cobalt γ-MnO2 Composite active layer.Compared with traditional lead-silver multi-element alloy, the anode life of the composite anode plate of the present application can be prolonged by 2 times, the cell voltage is reduced by more than 12%, the current efficiency is increased by more than 4%, and the quality of cathode product is high.

The application discloses a method for removing a hard-to-dissolve covering layer on the surface of a titanium-based lead dioxide anode, which comprises the following steps: softening treatment of the hard-to-dissolve covering layer on the surface of the titanium-based lead dioxide anode by using sodium hexametaphosphate or citric acid, and then complexing removal of the hard-to-dissolve covering layer on the surface of the titanium-based lead dioxide anode by using an alkaline solution containing potassium sodium tartrate under the assistance of ultrasonic waves. The method is simple in operation, and can simply and quickly remove the dense hard-to-dissolve covering layer deposited on the surface of the titanium-based lead dioxide anode without damaging the coating of the titanium-based lead dioxide anode, thereby improving current efficiency, reducing power consumption, prolonging the service life of the titanium-based lead dioxide anode and achieving the purpose of energy-saving and consumption-reducing production.

The invention discloses an efficient treatment and recovery method for chlor-alkali salt mud, and belongs to the technical field of chlor-alkali salt mud recycling. The invention relates to an efficient treatment and recovery method for chlor-alkali salt mud. The method specifically comprises the four steps of gradient pretreatment, electrochemical synergistic oxidation treatment, dynamic electrode assisted filtration and resource utilization or safe disposal. Large-particle impurities and water-soluble sodium chloride are effectively removed through three-section type screening and air flotation reverse water washing, organic impurities are subjected to synergistic oxidative degradation by adopting an electrochemical reaction tank with a titanium-based platinum-coated or lead dioxide as an anode, and then efficient filtration and dehydration are performed by utilizing a dynamic electrode system with a rotating anode structure; finally, the salty mud is subjected to drying treatment and component split-flow recycling. The method is high in desalination rate, thorough in impurity removal and remarkably improved in filtering efficiency, meanwhile, the recycled product can be used for waste acid neutralization or building material filler, waste recycling and cyclic utilization are achieved, and the method is suitable for salt mud closed-loop treatment in the chlor-alkali industry and has the advantages of being environmentally friendly, low in energy consumption, stable in operation and the like.

The invention relates to a titanium-based lead dioxide composite anode plate for hydrometallurgy and a preparation method of the titanium-based lead dioxide composite anode plate, and belongs to the technical field of hydrometallurgy. The titanium mesh-based lead dioxide composite gradient plate comprises a Ti-Cu-stainless steel conductive beam, a titanium transition plate and a titanium mesh-based lead dioxide composite gradient plate body, and the titanium mesh-based lead dioxide composite gradient plate body comprises a longitudinal conductive reinforcing rib I, a longitudinal conductive reinforcing rib II, a transverse conductive reinforcing rib I, a transverse conductive reinforcing rib II, an annular conductive reinforcing rib and a titanium-based lead dioxide composite mesh plate. The titanium-based lead dioxide composite screen plate sequentially comprises a titanium mesh substrate, a gamma-MnO2-CaOx composite oxide bottom layer doped with cobalt-coated glass fiber powder / nano Al2O3 particles, a Pb-Co-Zr-SbOx oxide middle layer and a beta-PbO2-WOx composite oxide active layer doped with SrTiO3-SiO2-Ag composite ceramic powder from inside to outside. The conductive support sequentially comprises a titanium substrate, a Pb-Co-Zr-SbOx oxide middle layer and a SrTiO3-SiO2-Ag doped composite ceramic powder beta-PbO2-WOx composite oxide active layer from inside to outside. The lead dioxide plating layer of the anode plate is not prone to falling off, the oxygen evolution potential is low, the service life is long, and the electric efficiency is high.

Aspects disclosed herein include a method for stabilizing a lead anode, the method comprising: operating an electrochemical cell comprising performing electrochemical reduction at a first cathode and electrochemical oxidation at a first anode; wherein: the electrochemical cell comprises a first anodic chamber having a first anolyte in contact with the first anode, a first cathodic chamber having a first catholyte in contact with the first cathode, and a first separator separating the first anolyte from the first catholyte; the first anode is a lead electrode; each of the first anolyte and the first catholyte independently comprises aqueous iron cations and aqueous anions; and the first anolyte comprises the aqueous iron cations at a concentration selected from the range of 0.01 M to 0.5 M.

The application discloses a lead-sodium storage battery positive pole lead paste in the technical field of storage batteries, which comprises the following components by weight: lead oxide powder 100 parts, sulfuric acid 6-10 parts, deionized water 14-24 parts, short fibers 0.05-0.07 parts, lead dioxide 2-8 parts, lead sulfate 1-2 parts, calcium sulfate 0.5-1.5 parts, stannous sulfate 0.05-0.15 parts, antimony trioxide 0.05-0.15 parts, carbon black 0.5-1 part, sodium hydroxymethyl cellulose 0.1-0.2 parts and mixed carbon material 0.1-0.5 parts. Through the design improvement of the process, the application can effectively improve the formation efficiency, low-temperature performance and service life of the storage battery.

An electrochemical cell assembly includes an electrochemical cell including housing and a negative active material disposed within a first electrode chamber of the housing. The negative active material includes lead. The electrochemical cell further includes a positive active material disposed within a second electrode chamber of the housing and a separator disposed in the housing between the first electrode chamber and the second electrode chamber. The positive active material includes lead and / or lead dioxide. The electrochemical cell assembly further includes a pumping assembly configured to pump a plurality of electrolytes through either the first electrode chamber or the second electrode chamber during operation of the electrochemical cell based on a process of a cell cycle of the electrochemical cell.

This invention discloses a method for preparing lead halide semiconductor thin films from waste lead paste. The method includes the following steps: A: Thoroughly cleaning the substrate, followed by drying; B: Collecting a portion of lead paste from waste lead-acid batteries, first using a desulfurizing agent to desulfurize the lead paste with lead sulfate, then adding a reducing agent to convert lead dioxide into lead oxide, and then using an organic acid leaching agent to obtain an acid solution containing divalent lead ions; C: Depositing the acid solution containing divalent lead ions and a certain amount of halogenated acid or halide salt onto the treated substrate, then placing the substrate on a hot plate for high-temperature annealing, obtaining the lead halide semiconductor thin film after annealing, and then drying it in a drying oven. This method not only simplifies the steps and directly yields lead halide thin films, reducing excessive waste of lead resources, but also promotes the large-scale application of optoelectronic devices with the obtained lead halide thin films.

The invention provides a waste lead dioxide anode resource recycling method which comprises the following steps: pretreatment: cleaning a waste lead dioxide anode to remove electrolyte crystals on the surface; the pretreated waste anode is placed in a hydrochloric acid solution to react for 30-50 min, and surface metal oxide is removed; the waste anode is placed in a solution B and soaked for 20-40 min at the normal temperature, part of lead dioxide is dissolved, and the solution B comprises 13-18 wt% of nitric acid and 13-18 wt% of hydrogen peroxide; adding nitric acid and hydrogen peroxide to enable the mixed solution to contain 23-27wt% of nitric acid and 23-27wt% of hydrogen peroxide, heating the mixed solution to 50-60 DEG C, continuously reacting for 25-40 minutes under the condition of blowing air, and dissolving the residual lead dioxide to obtain a leaching solution; the leaching liquid is repeatedly used until the concentration of lead nitrate in the leaching liquid reaches 250-320 g / L, and the leaching liquid is conveyed to an electroplating production line to be recycled after being filtered; and the treated titanium base material is cleaned and then is electroplated again for use. The waste lead dioxide anode resource recycling method provided by the invention is a low-temperature, high-efficiency and low-pollution regeneration technology, and can realize the repeated use of a titanium substrate and the recycling of a lead nitrate solution.

The utility model discloses a treatment device integrating activated carbon adsorption and activated carbon regeneration with a multilayer structure. The treatment device comprises an electrolytic bath, a direct-current power supply and a circulating pipeline, a plurality of groups of electrode plates which are sequentially arranged in parallel are arranged in the electrolytic bath, and each group of electrode plates comprises a titanium-based lead dioxide anode plate and an activated carbon particle cathode plate; the direct-current power supply is connected with the multiple groups of electrode plates through wires, the cathode of the direct-current power supply is connected with the active carbon particle cathode plate, and the anode of the direct-current power supply is connected with the titanium-based lead dioxide anode plate; the circulating pipeline is provided with a centrifugal pump, the water inlet end and the water outlet end of the circulating pipeline are respectively connected with the water inlet and the water outlet of the tank body, and the circulating pipeline is used for circulating wastewater to pass through the tank body. The design of the electrode plate optimizes the electrochemical reaction efficiency, the direct-current power supply ensures stable current output, and continuous circulation of wastewater is realized through the circulation pipeline. The device performs in-situ regeneration on activated carbon through electrochemical reaction, so that the operation efficiency is improved.

The invention relates to a water-soluble plumbic acid static storage battery. The battery comprises a single battery body, the single battery body comprises an electrode plate, a static electrolyte and a container for containing the electrolyte, the electrode plate is inserted into the electrolyte, the electrolyte comprises water-soluble lead salt, acid, a lead dissolving agent and water, the lead dissolving agent can provide at least one water-soluble redox couple R oxidation and R reduction, and the water-soluble redox couple R oxidation and R reduction can be separated from the electrode plate. The electrode potential of the redox couple satisfies E [theta] (Pb < 2 + > / Pb) lt; e [theta] (R oxidation / R reduction) [lt]; e theta (PbO2 / Pb2 +). No diaphragm exists, the electrolyte is in a static state, facilities such as a circulating pump are not needed, lead ions are allowed to migrate under the concentration gradient effect, and meanwhile self-discharge caused by convection shuttling of the lead dissolving agent is greatly reduced. In the charging process, lead and lead dioxide can be flatly deposited on the surface of an electrode and can be completely dissolved in the discharging process, the cycling stability is good, the components can be kept stable for a long time, and the cost is low.

The present invention relates to the technical field of heavy metal wastewater treatment, in particular to an electrochemical device and an extraction method for extracting copper from copper-containing wastewater, wherein the electrochemical device comprises an anode material consisting of activated carbon, graphite, lead dioxide, BDD and Cu m X 1-a-b Y a Z b and a cathode material made of Cu n X 1-c-d Y c Z dand a carbon-selenium complex, and the cathode and anode are connected to a power supply for the treatment of copper-containing wastewater; wherein 1 < m ≤ 2, 1 ≤ n < 2 and m > n; 0 ≤ a ≤ 1, 0 ≤ b ≤ 1 and 0 ≤ a + b ≤ 1; 0 ≤ c ≤ 1, 0 ≤ d ≤ 1 and 0 ≤ c + d ≤ 1; and X, Y and Z are selected from one of S, Se and Te. The present invention uses copper-based sulfur compounds as electrode material and forms an electrochemical device with other electrodes, wherein the device is an electrocatalytically coupled deionization system with electrochemical oxidation and complexation breaking properties and exhibits good selective removal of Cu. 2+in organic, complex copper-containing wastewater, highly acidic wastewater, and wastewater contaminated by high concentrations of salt ions and heavy metal ions; this device can effectively break down the complexation of the organic pollutant complex Cu-EDTA, thus facilitating the extraction of Cu 2+ complete.

The invention belongs to the technical field of electrochemical anode preparation, and particularly relates to a preparation method and application of a high-energy-efficiency titanium-based lead dioxide anode, and the preparation method comprises the following steps: pretreating a titanium plate, preparing a tin-antimony solution, coating and sintering the titanium plate to prepare a tin-antimony oxide intermediate layer, and electrodepositing and plating lead to obtain the high-energy-efficiency titanium-based lead dioxide anode. According to the method, the electrochemical performance and catalytic activity of the titanium-based lead dioxide anode can be improved, and the zinc electrodeposition power consumption of the titanium-based lead dioxide anode is reduced when the method is applied to the field of zinc electrodeposition.

The invention relates to a preparation method of a catalytic anode based on a porous tetragonal system lead dioxide coating, and belongs to the technical field of hydrometallurgy. The method comprises the following steps: by taking a lead-silver alloy matrix electrode as an anode and a stainless steel plate as a cathode, carrying out anode constant-current electrodeposition in a lead oxide alkaline electrolyte to obtain a lead-silver / orthorhombic system lead dioxide electrode; a lead-silver / orthorhombic system lead dioxide electrode is used as a working electrode, a stainless steel plate is used as a counter electrode, a mercury / mercurous sulfate electrode is used as a reference electrode, linear scanning electrodeposition is carried out in a methanesulfonic acid-methanesulfonic acid lead-acid system, and the porous tetragonal system lead dioxide coating catalytic anode material is obtained. The porous tetragonal lead dioxide coating catalytic anode material has excellent oxygen evolution electro-catalytic performance and stability, and can solve the bottleneck problems of high energy consumption per ton of zinc and high maintenance cost caused by overlarge oxygen evolution overpotential, short service life and the like of the traditional lead-silver anode catalytic material in the zinc electrodeposition process in zinc hydrometallurgy.

The application discloses an electrochemical method for degrading pesticide gamma-HCH in water by using a modified lead dioxide-graphite felt electrode, and belongs to the field of water treatment by using an electrochemical method. The application first prepares a modified lead dioxide electrode, constructs an electrolysis reaction system by cooperating with a graphite felt electrode, and combines an electrolyte to electrochemically degrade pesticide gamma-HCH in water. The method is simple, practical and efficient, has high degradation efficiency and environmental friendliness, and is capable of degrading pesticide gamma-HCH in water in a very short time through cathode leading and anode assisting, based on direct electron transfer and indirect oxidation path, and maintaining a high removal rate in a pH range of 3-11.

This invention discloses a carboxyl-modified lanthanum-cerium co-doped lead dioxide catalytic electrode, its preparation method, and its application, belonging to the field of wastewater treatment technology. The preparation method of the carboxyl-modified lanthanum-cerium co-doped lead dioxide catalytic electrode of this invention includes the following steps: mixing lead salt, cerium salt, lanthanum salt, and sodium fluoride, adjusting the pH to acidic to obtain an electrodeposition solution; using a carbon substrate as the anode and the electrodeposition solution as the electrolyte, performing electrodeposition to obtain a LaCe / PbO2-C electrode; immersing the LaCe / PbO2-C electrode in a carboxyl-containing organic acid solution to carry out a carboxyl modification reaction, completing the preparation. The electrochemical system based on the CA@LaCe / PbO2-C catalytic anode constructed in this invention is effective in treating favipiravir and Cu... 2+ Regarding mixed wastewater, it can achieve efficient degradation of organic pollutants and simultaneous recovery of heavy metal ions.

This invention relates to a method for preparing an electrode for measuring chemical oxygen demand (COD) in water, and pertains to the field of electrode preparation technology. The method for preparing the electrode for measuring COD in water using this invention involves the preparation of a lead dioxide electrode using titanium or titanium alloys as the conductive substrate material. In this method, a lead dioxide sensitive film is first deposited on the surface of titanium or titanium alloy using an electrochemical method. Subsequently, the exposed titanium or titanium alloy conductive substrate is rapidly oxidized using an electrochemical passivation method to form an electrochemically inert insulating layer. This solves the problems of baseline drift and large background current caused by the slow oxidation of the exposed titanium or titanium alloy conductive substrate during the testing process. The method for preparing the electrode for measuring COD in water using this invention is simple, rapid, highly operable, and highly controllable, and can meet the requirements for batch preparation. The prepared lead dioxide electrode can be used as the working electrode of a COD electrochemical sensor.

The present invention relates to a membrane electrode for preparing ozone and a preparation method thereof. The anode surface of the membrane electrode is loaded with an anode catalyst layer, and the cathode surface is loaded with a cathode catalyst layer. The anode catalyst layer comprises lead dioxide, a binder, a dispersing solvent and a surfactant, and the mass ratio of the lead dioxide, the binder, the dispersing solvent and the surfactant is 1: (6-7): (40-50): (0.13-0.26). The anode catalyst layer is loaded on one side of a proton exchange membrane by a transfer method. The cathode catalyst layer comprises platinum carbon, a binder and a solvent, and the platinum loading amount in the cathode catalyst layer is 0.5-1 mg / cm 2 The mass ratio of carbon content in the platinum carbon to the binder is 1:(0.5-1). The cathode catalyst layer is spray-coated on the other side of the proton exchange membrane. The membrane electrode of this invention has stable performance and can be used in ozone generators. It only needs a voltage of 3.5V to decompose water into ozone, with high efficiency and fast production speed.

The invention relates to the technical field of hydrometallurgy, in particular to a method for recycling lead series products from waste lead plaster three-chamber ore pulp through electrolysis and phase separation. The invention discloses a method for recycling a lead-series product through electrolysis and phase separation of waste lead plaster three-chamber ore pulp. The method comprises the following steps that 1, electrolyte is placed in a cathode chamber, an anode chamber and an intermediate chamber of an electrolytic bath; 2, adding waste lead paste powder into the electrolyte of the middle chamber, and uniformly dispersing; and step 3, switching on a power supply for electrolysis, obtaining metal lead in the cathode chamber after electrolysis is finished, obtaining lead dioxide in the anode chamber, and obtaining lead sulfate in the intermediate chamber. According to the method, oxidation deposition of lead is achieved in the anode area to generate lead dioxide, reduction electrodeposition of lead ions is completed in the cathode area to prepare metal lead, and a lead sulfate product is enriched and separated out in the middle chamber. The method integrates waste lead plaster leaching, electrolysis and product separation, is short in process and low in energy consumption, and provides a new technical path for clean and high-value recovery of the waste lead plaster.

The invention discloses an aluminum-lead dioxide aqueous ion battery and application thereof in energy storage equipment. The aluminum-lead dioxide aqueous ion battery comprises a positive electrode chamber and a negative electrode chamber, the positive electrode chamber and the negative electrode chamber are separated by a diaphragm; the positive electrode chamber comprises a positive electrode and a positive electrode electrolyte, the positive electrode contains an active substance, the active substance comprises lead dioxide, and the positive electrode electrolyte is an acidic electrolyte; the negative electrode chamber comprises a negative electrode and a negative electrode electrolyte, and the negative electrode is an aluminum negative electrode; and the negative electrode electrolyte is an alkaline electrolyte. The aluminum-lead dioxide aqueous ion battery provided by the invention realizes high battery voltage output under the aqueous electrolyte condition, and is simple in setting and green and environment-friendly. The aluminum-lead dioxide aqueous ion battery provided by the invention has high energy density, power density and good safety.