23 results about "Lead dioxide" patented technology

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 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.

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.

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.

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 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 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 embodiment of the application provides a titanium dioxide nanotube intermediate layer cooperated with neodymium modified titanium-based lead dioxide hydrophobic electrode and a preparation method and application thereof, and belongs to the technical field of electrocatalytic oxidation anode materials. The titanium-based lead dioxide hydrophobic electrode comprises a titanium base plate, a titanium dioxide nanotube intermediate layer formed on the surface of the titanium base plate, which is a vertically oriented nanotube array structure, and a neodymium modified lead dioxide surface active layer deposited on the surface of the titanium dioxide nanotube intermediate layer; wherein the neodymium modified lead dioxide surface active layer is a super-hydrophobic surface formed by regulating a hydrophobic agent, and the contact angle with water is greater than or equal to 140 degrees. The electrode prepared by the application solves the problems of easy falling off of the active layer and passivation of the titanium base, greatly prolongs the service life of the electrode, and enhances the catalytic activity and corrosion resistance, thereby improving the efficiency of wastewater advanced treatment and salt resource utilization.

This invention belongs to the field of electrocatalytic oxidation technology, specifically disclosing a modified titanium-based coated electrode, its preparation method, and its application. The electrode, from bottom to top, consists of a titanium substrate etched with mixed acid, a zirconium tin oxide intermediate layer constructed by thermal decomposition, and an electrodeposited lead dioxide active layer. The modified titanium-based coated electrode is applied to the electrocatalytic oxidation degradation of organic dye wastewater. The modified titanium-based coated electrode provided by this invention has low manufacturing cost. The lead dioxide active layer has a dense tetrahedral pyramidal structure, which effectively prevents reactive oxygen species from penetrating the electrode surface, protects the outer layer from detachment, improves electrode performance, extends electrode lifespan, and provides abundant active sites for efficient electrocatalytic degradation of organic pollutants.

The invention discloses a method for extracting lead from waste lead plaster by taking sulfide minerals as a reducing agent, and belongs to the field of hydrometallurgy. The method comprises the following steps: mixing, heating and stirring the waste lead plaster, sulfide minerals, ferric salt and a sulfuric acid solution, reducing and converting a lead-containing phase in the waste lead plaster into insoluble lead sulfate to obtain reducing slag, generating ferrous ions from the sulfide minerals under the action of a ferric salt catalyst, and reducing and converting lead dioxide in the waste lead plaster into lead sulfate; the reducing slag and an acetate solution are mixed, heated and stirred, lead sulfate is desulfurized and leached into soluble lead acetate, and a lead-containing leaching solution is obtained. Aiming at the waste lead plaster in the waste lead-acid storage battery, the low-cost sulfide mineral is used as a reducing agent, so that the process cost is reduced. By means of the two-step process of reduction conversion and desulfurization leaching, the additional impurity separation procedure is avoided, the extraction efficiency of lead in the waste lead plaster is 99% or above, the pure lead-containing leaching solution is obtained, and a new thought is provided for efficient recycling of the waste lead plaster.

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 confirming the passivation layer of the positive grid of a lead-acid battery panel, comprising the following steps: S1, initial cleaning; S2, removal of lead dioxide; S3, secondary cleaning; S4, drying treatment; and S5, acetic acid reaction test. By observing the reaction of the grid surface with the acetic acid aqueous solution (whether bubbles are generated) and the appearance of metallic luster, the presence of a passivation layer can be directly determined. The results are intuitive and easy to understand, requiring no complex data analysis. Pre-treatment steps such as initial cleaning, lead dioxide removal, and secondary cleaning effectively eliminate interference from other substances on the grid surface, ensuring the accuracy of the acetic acid reaction test. Furthermore, by optimizing reaction conditions (such as acetic acid concentration, reaction temperature, and reaction time), the reliability of the test results is further improved.

The invention provides a solid-state lead-acid storage battery based on curved-surface graphene, and relates to the technical field of batteries, the solid-state lead-acid storage battery comprises a positive plate, a negative plate and a solid-state electrolyte, the positive plate uses lead dioxide as an active substance, and is in contact with the solid-state electrolyte to complete an oxidation reaction; the negative plate adopts metal lead Pb to participate in the reduction reaction; according to the solid electrolyte, lithium carbosilicate-based gel is adopted as electrolyte, and an ion conduction channel is provided, so that effective charge transfer is carried out between a positive electrode and a negative electrode; according to the invention, lead Pb is used as a negative electrode, lead dioxide is used as a positive electrode, lithium carbosilicate is used as an electrolyte, the curved graphene with a specific quantum effect is added into the positive and negative electrode plates, and the electrode reaction kinetics is optimized by using the curved shell structure and the high specific surface area characteristic of the curved graphene, so that the energy conversion efficiency of the battery is improved from 35%-55% traditionally to 70%-99% or above.

This invention discloses a method for preparing an iron-cobalt co-doped lead dioxide electrode and its application in the synergistic degradation of antibiotic-containing wastewater. Using titanium as a substrate and in-situ self-grown titanium dioxide nanotubes as a transition layer, the iron-cobalt co-doped lead dioxide electrocatalytic anode (Fe-Co-PbO2-TNAs / Ti) is prepared. This invention combines anodic oxidation with cathodic reduction, along with high-temperature calcination in a tube furnace. First, a TiO2 nanotube array (TNAs / Ti) is constructed on the surface of the titanium substrate. Then, the Fe-Co-PbO2-TNAs / Ti anode is prepared using a water bath-electrodeposition method, while simultaneously preparing an S-doped Co3O4 cathode. The constructed anode-cathode coupling system achieves the synergistic effect of anodic oxidation and cathodic reduction, effectively improving the removal capacity of typical recalcitrant organic pollutants in pharmaceutical and chemical wastewater by regulating the generation of active species and the interfacial electron transfer process.

The invention relates to a tetratitanium heptaoxide modified lead dioxide composite electrode as well as a preparation method and application thereof. The lead dioxide composite electrode comprises a titanium substrate, an alpha-lead dioxide intermediate layer and an active layer which are sequentially stacked, the active layer comprises beta-lead dioxide doped with tetratitanium heptaoxide; by doping tetratitanium heptaoxide in the active layer and cooperating with the arrangement of the alpha-lead dioxide intermediate layer, the lead dioxide composite electrode is more compact in structure and stronger in stability, and meanwhile, active sites on the surface of the electrode are increased, so that the electrochemical oxidation performance is improved, and the service life of the electrode is prolonged. The leaching rate of As is preferably improved to 97.0% or above when the arsenic-containing copper ash leaching agent is applied to the arsenic-containing copper ash leaching process; the conversion rate of As (III) in the enriched arsenic solution is preferably increased to 94.5% or above, and the preparation method is simple in technological process, easy in condition control and easy for large-scale production.

The invention relates to a titanium-based polyaniline gradient composite electrode plate for non-ferrous metal electrodeposition and a preparation method of the titanium-based polyaniline gradient composite electrode plate, and belongs to the technical field of non-ferrous metal electrodeposition metal extraction. The titanium-based polyaniline gradient composite electrode plate comprises a titanium-coated cobalt-coated aluminum-based conductive beam, a titanium transition plate and a titanium mesh-based polyaniline gradient plate, wherein longitudinal conductive reinforcing ribs, transverse conductive reinforcing ribs I and transverse conductive reinforcing ribs II of the titanium mesh-based polyaniline gradient plate form a conductive frame; titanium mesh-based polyaniline gradient plates I with small meshes are welded in the upper area and the lower area of the conductive frame, and titanium mesh-based polyaniline gradient plates II with large meshes are welded in the middle area of the conductive frame. Compared with the traditional titanium-based lead dioxide, the titanium-based polyaniline gradient composite electrode plate has the advantages that the cell voltage of the titanium-based polyaniline gradient composite electrode plate serving as an anode is reduced by more than 0.1 V, the current efficiency is improved by more than 2%, a plating layer is not easy to fall off, and the quality of a cathode product is high when the titanium-based polyaniline gradient composite electrode plate is subjected to electrodeposition under the same condition in a sulfuric acid electrolyte system containing high fluorine chloride ions.

The application discloses a preparation method of an iron-cobalt co-doped lead dioxide electrode and application of the electrode in synergistic degradation of antibiotic-containing wastewater, and the iron-cobalt co-doped lead dioxide electrocatalytic anode (Fe-Co-PbO2-TNAs / Ti) is prepared by taking titanium as a substrate and in-situ growing titanium dioxide nanotubes as a transition layer. The application combines anodic oxidation and cathodic reduction, and combines high-temperature calcination of a tubular furnace, to first construct TiO2 nanotube arrays (TNAs / Ti) on the surface of a titanium substrate, and then to prepare the Fe-Co-PbO2-TNAs / Ti anode by using a water bath-electrodeposition method, and to simultaneously prepare an S-doped Co3O4 cathode. The constructed anode-cathode coupling system can realize the synergistic effect of anodic oxidation and cathodic reduction, and can effectively improve the removal capacity of typical refractory organic pollutants in pharmaceutical chemical wastewater by regulating the generation of active species and the interface electron transfer process.

The present invention relates to a water-soluble lead-acid static storage battery. The present invention comprises a battery cell. The battery cell comprises electrode plates, a static electrolyte, and a container. The electrode plates are inserted in the electrolyte. The composition of the electrolyte comprises a water-soluble lead salt, an acid, and water, and further comprises a lead-dissolving agent, or a structure extends from a bottom end of a negative electrode plate to below a positive electrode plate. The lead-dissolving agent is capable of providing at least one water-soluble redox couple Rox / Rred, the electrode potential of the redox couple satisfying Eθ(Pb2+ / Pb)<Eθ(Rox / Rred)<Eθ(PbO2 / Pb2+). The present invention has no separator, and the electrolyte is in a static state, requiring no facilities such as a circulation pump, allowing lead ions to migrate under the action of a concentration gradient, while also greatly reducing self-discharge caused by convective shuttling of the lead-dissolving agent. During charging, lead and lead dioxide can be smoothly deposited on electrode surfaces, and can be completely dissolved during discharging, achieving good cycle stability and enabling components to remain stable over a prolonged period.

The application discloses a recycling method of metal ions in an electrodeposition process. The application adopts a double-tank circulation structure of an electrodeposition main tank and an independent dissolving tank, and at least two groups of graphite cathodes are arranged to be alternately switched. In the electrodeposition process, hydrogen ions are continuously released by an anode lead dioxide generation reaction, so that the concentration of free nitric acid is increased. After a single batch deposition is completed, the copper-accumulated cathode is transferred into the independent dissolving tank, free nitric acid generated in the next batch electrodeposition is used as a copper dissolving agent to dissolve the cathode elemental copper, and copper ions are circulated back to the main tank through the tank liquid to supplement the consumption, so that the closed-loop recycling of copper ions is realized. The application does not need to additionally add a copper dissolving agent for the copper dissolving process, can greatly reduce the supplement amount of copper salt in the production process, can reduce the production cost, shorten the cathode treatment cycle, and improve the continuous production efficiency of lead dioxide plated parts.

The present disclosure provides a composite conductive film, a preparation method and application thereof, wherein the composite conductive film comprises: a metal microfiltration membrane substrate; a lead dioxide layer on the surface of the substrate by electrochemical deposition; and a transition metal oxide loaded on the lead dioxide layer, wherein the transition metal oxide is a microspherical skeleton structure, and the transition metal comprises any one of ruthenium, iridium, tin and nickel.

The invention discloses an electrodeposition device and method for regulating and controlling the apparent density and morphology of copper powder through an external field enhanced electrodeposition method, and belongs to the technical field of metal powder preparation. Activating the anode plate to form a uniform and compact lead dioxide coating on the surface of the anode plate; an electro-deposition device capable of automatically feeding an additive is adopted, and the device is provided with a stirring container and a temperature control base, so that constant-temperature heating can be realized; the circulation of the electrodeposition liquid of the stirring container and the electrodeposition tank can be realized through the liquid conveying control mechanism, the liquid inlet pipe and the liquid return pipe to maintain the stability of solution components; and a plurality of activated anode plates and cathode plates are alternately arranged in an electrodeposition cell at intervals, auxiliary ultrasonic enhanced electrodeposition treatment is carried out on the electrodeposition cell, electrodeposition copper powder is obtained, and the apparent density is recorded. According to the electrodeposition device, integrated collaborative operation of anode pretreatment activation, ultrasonic external field strengthening and copper electrodeposition is met, the automation degree is high, accurate regulation and control and morphology optimization of the apparent density of the copper powder can be achieved, and the production stability and the product consistency of the copper powder are improved.