22 results about "Metal pollution" patented technology

The utility model relates to a kind of water body heavy metal pollution cyclic repair equipment, its structure is: three purification columns are positioned in the shell inner cavity circumference, heavy metal chelate particles are equipped in purification column;Water tank is connected at the lower end of shell, three water tanks of upper open are distributed in the circumference in water tank, the top of water tank corresponds with the position of purification column, the top of water tank is connected inlet pipe, extends water tank, pipe end portion has butterfly valve, the bottom of water tank is connected outlet pipe, extends water tank, pipe end portion has three-way valve;Positioning plate is connected at the upper end of shell, three water circulation pumps are peripherally arranged in positioning plate, the water inlet of water circulation pump upper end is communicated with the inner cavity of corresponding water tank by outlet pipe, the water outlet position of water circulation pump lower end corresponds with the upper end opening position of purification column. The repair equipment can repair heavy metal pollution water body by the purification column filled with adsorption material, and through water circulation system, improve water body repair efficiency, realize heavy metal recovery and the reuse of adsorption material.

The application relates to the technical field of nanomaterials, in particular to a hydrogen-bonded organic framework loaded nanoseelenium material and a preparation method and application thereof, wherein the preparation method comprises the following steps: preparing a hydrogen-bonded organic framework material HOF; resuspending the prepared HOF in a bovine serum albumin aqueous solution, stirring and reacting, centrifugal washing and concentrating, and resuspending in a buffer solution; on the basis of the above solution, adding a sodium selenite solution dissolved in the buffer solution to continue stirring, adding a reducing agent to react, and growing nanoseelenium SeNPs on the surface of the HOF in situ; centrifugal washing and purifying the obtained product, resuspending in a polyethylene glycol aqueous solution to react, centrifugal washing and concentrating, and obtaining HOF@SeNPs. The prepared HOF@SeNPs are suitable for the fields of plant selenium-rich cultivation, crop heavy metal pollution control, animal cadmium poisoning relief, selenium-rich animal product feeding and the like, and provide a new idea for green agriculture and environment remediation and selenium element strengthening of agricultural products.

The application relates to the technical field of semiconductor and MEMS devices, in particular to a monolithic integration method of dielectric isolation bipolar IC and piezoresistive MEMS devices. A buried layer of a bipolar IC circuit is prepared on the upper surface of a second silicon base; then a single crystal silicon epitaxial layer is grown on the upper surface of the second silicon base; a circuit function area (including an NPN area and a PNP area) is prepared on the single crystal silicon epitaxial layer corresponding to the area of the bipolar IC circuit; an isolation groove penetrating through the single crystal silicon epitaxial layer and the second silicon base is formed by adopting an etching process, so that the NPN area and the PNP area in the bipolar IC circuit form isolated islands respectively; polycrystalline silicon is used to fill the isolation groove; a piezoresistor is prepared on the upper surface of the single crystal silicon epitaxial layer, and metal wires connecting the NPN area, the PNP area and the piezoresistor are prepared respectively. The application overcomes the problems of device thickness and stress mismatch, conflict of material resistivity requirements, and metal pollution control difficulty faced by IC-MEMS preparation.

This invention relates to the fields of environmental engineering and pollution remediation technology, and in particular to a bioelectrochemical system for the remediation and fixation of heavy metal pollution in groundwater and its application. The bioelectrochemical system employs an integrated columnar layered structure simulating vertical seepage of groundwater, comprising, from bottom to top: a groundwater inlet zone, a first transition support layer, an anodic reaction zone, an intermediate isolation layer, and a cathodic reaction zone. Electroactive microorganisms in the anodic zone oxidize organic matter, releasing electrons. These electrons are transferred to the cathode via an external circuit, driving the reduction of heavy metal ions (such as Cr(VI)) to a lower valence state, while pyrite releases Fe. 2+ Biochar promotes precipitation by enhancing fixation through adsorption and electron shuttle. This bioelectrochemical system enables continuous in-situ remediation of groundwater, achieving a Cr(VI) removal rate of up to 92.7%, while simultaneously removing organic matter and nitrogen and phosphorus pollutants. It exhibits stable long-term operation with a low risk of heavy metal re-release, requires no large amounts of chemical reagents or external power supply, and has low operating costs.

This invention discloses a method for predicting wastewater volume and heavy metal flux in watershed mining projects, belonging to the field of mining area environmental pollution simulation and water resource management. This invention achieves dynamic collaborative simulation of wastewater generation, collection, treatment, and discharge processes by constructing a framework coupling a distributed hydrological model with the mining area's water supply and drainage network. Furthermore, it introduces a quantile gradient boosting regression algorithm to correct the residuals of the physical baseline simulation results, thereby improving prediction accuracy under low-frequency monitoring conditions. This invention can effectively characterize the spatiotemporal coupling relationship between rainfall-runoff generation processes and engineering operations, and has significant application value in mining wastewater discharge control, heavy metal pollution prevention and control, and engineering decision support.

This invention provides a method and system for precise source tracing of heavy metals in sediments based on background value stripping, relating to the fields of environmental monitoring and pollution source tracing. The invention optimizes sampling based on a three-level zoning method using watershed boundaries, hydrological models, and lake bay morphology, establishing pollution time series by 1cm stratification combined with 210Pb dating. By constructing a background sediment database and employing the Savitzky-Golay filter curvature extremum method and robust double standard deviation method to determine zoning background values, the anthropogenic source content of different eras is obtained after stripping the natural background, achieving precise identification and source tracing of heavy metal pollution evolution.

This invention relates to the field of groundwater pollution remediation technology, specifically to a multifunctional synergistic filler and a green electricity-driven electrochemical groundwater remediation method. The filler uses attapulgite or montmorillonite-modified biomass pyrolytic carbon as a substrate, in-situ constructing a three-dimensional interconnected conductive network of graphene quantum dots and carboxylated carbon nanotubes. It anchors bifunctional catalytic sites composed of layered bimetallic hydroxides and defective metal oxides, possessing multiple functions including water permeability, adsorption and capture, electron transfer, and electrocatalytic reduction. Based on this filler, this invention constructs an e-PRB remediation wall, using solar green electricity to drive a fluctuating electric field to enhance the directional migration and in-situ fixation of heavy metals. An integrated multi-field coupling numerical model and dual intelligent control algorithm enable adaptive operation, simultaneously completing targeted heavy metal remediation, resource recovery, and in-situ regeneration of the filler. This method boasts high remediation efficiency, low carbon footprint, and environmental friendliness, making it suitable for various in-situ remediation scenarios for heavy metal pollution in groundwater.

The utility model discloses a wafer fixing device, including electrostatic chuck, compression ring and deposition ring, the electrostatic chuck outside is provided with deposition ring, the electrostatic chuck is located the bottom of wafer, the compression ring is located the top of wafer, the inside diameter of deposition ring is greater than electrostatic chuck outside diameter, the outside diameter of deposition ring is greater than the outside diameter of wafer, the inside diameter of compression ring is less than the outside diameter of wafer, the bottom of electrostatic chuck is provided with heater and motor, the heater is driven under motor, makes the wafer that places on electrostatic chuck ascending movement and with compression ring contact through the screw rod drive mechanism, and the compression ring covers deposition ring completely. The wafer fixing device provided by the utility model can effectively improve and reduce the high warping degree wafer sputtering process difficulty, increase wafer utilization, reduce wafer sticking, back metal pollution and the problem of tip discharge.

This invention belongs to the field of industrial catalysis technology, specifically relating to a heterogeneous catalyst based on metallocene supported by Xianglian biochar, its preparation method, and its applications. The process includes: dissolving a metal precursor in an ethanol solution, mixing it with biochar, ultrasonically dispersing the mixture, vacuum drying, and then reducing it at 300°C by introducing a H2 / N2 mixture to form nanoscale metal particles. The electron density of the metal centers is then controlled by grafting an ionic liquid to inhibit the aggregation of active sites, thus obtaining the heterogeneous catalyst based on metallocene supported by Xianglian biochar. The advantages of this invention are: the catalyst exhibits excellent catalytic performance under mild conditions; the catalyst has good control over the molecular weight of the product; as a heterogeneous catalyst, it is easy to recycle and reuse, reducing metal pollution and improving economic efficiency; and the preparation method is simple and easy to implement for industrial production.

This invention belongs to the field of heavy metal pollution remediation technology in water environments, and provides a magnetic porous loess organic composite material, its preparation method, and its application. The preparation method of the magnetic porous loess organic composite material includes: acid-activating loess material to obtain acid-activated loess material; mixing the acid-activated loess material with an alkaline pore-forming agent in water to form a homogeneous slurry, then adding an acid solution dropwise to form a mixed slurry, and reacting under stirring conditions to obtain porous loess material; assembling the porous loess material with Fe3O4 nanoparticles in the presence of sodium carboxymethyl cellulose to obtain a Fe3O4 / loess magnetic composite material; mixing the Fe3O4 / loess magnetic composite material, an amino compound, and an aldehyde compound, and allowing the amino compound and aldehyde compound to undergo a Schiff base reaction to obtain the magnetic porous loess organic composite material. This invention solves the problems of the limited adsorption effect of natural loess on heavy metal ions and the problems existing in the composite process with Fe3O4 nanoparticles.

This invention provides a method and system for heavy metal source tracing and impact assessment based on the coupling mechanism of multi-pathway migration processes of pollutants. The system includes: data collection and monitoring surveys, pollutant source tracing analysis, heavy metal occurrence and release risk analysis, migration and transformation model construction and parameter experiments, simulation and impact assessment. It adopts a closed-loop technical route of "field investigation-monitoring-source tracing-simulation-assessment," constructing a multi-module migration and transformation model coupling hydrodynamics, sediment transport, convection-diffusion transport, and sediment-water interface exchange, and calibrating key parameters through indoor experiments. This invention can achieve accurate identification of heavy metal pollution sources and refined simulation of migration processes, supporting forward risk extrapolation and reverse control threshold calculation, providing systematic technical support for watershed water environment governance and protection.

The present invention provides a highly conductive irregularly shaped gasket and a method for manufacturing the same, which is free from metal contamination, exhibits low deformation and low rebound. [Solution] The metallic foil 11 is made of a specific metal that does not cause metal contamination, including aluminum, and is configured as a rectangular thin film whose longitudinal size corresponds to the longitudinal size of the insulating fabric, and is provided on the surface of the rectangular insulating fabric 10. The elastic member 12 is configured as an elongated shape whose longitudinal size corresponds to the longitudinal size of the insulating fabric, and has an irregular cross-sectional shape that bulges upward from the bottom surface. In the irregular gasket of the present invention, one end of the insulating fabric in the short direction is attached to the lower surface of the elastic member in the short direction, the back surface of the insulating fabric is attached to the surface of the elastic member, and the other end of the insulating fabric in the short direction is attached to the elastic member, so that the metallic foil is continuously arranged from the upper surface to the lower surface of the elastic member in the short direction via the insulating fabric.

This invention discloses a method for analyzing and evaluating heavy metal pollution in sediments, belonging to the field of environmental statistical modeling technology. The method includes: acquiring sediment physicochemical property indicators; calculating the effective adsorption capacity of each component using a preset saturation response relationship; inputting the physicochemical indicators into a Bayesian network constructed with hierarchical mechanism constraints to infer the latent variable of heavy metal adsorption affinity; constructing a competitive mapping function containing a vacancy constant term based on a competitive Langmuir mechanism to calculate the capacity occupancy rate under multi-metal competition conditions; and finally calculating the predicted heavy metal content from the effective adsorption capacity and occupancy rate. This invention introduces a physical capacity upper limit and a multi-metal competition occupancy mechanism into the Bayesian network, solving the problems of prediction distortion and lack of competition mechanism in traditional models under high loads, and achieving accurate evaluation consistent with physicochemical laws.

This invention discloses a CaAl-LDH modified biochar composite material based on calcium carbonate slag and corn cob, its preparation method, and its applications. The preparation method uses industrial solid waste calcium carbonate slag as the calcium source for synthesizing CaAl-LDH. First, a mixed salt suspension containing calcium source and aluminum salt is prepared. Then, a co-precipitation method, ball milling, and hydrothermal reaction process are used to thoroughly mix the mixed salt suspension with agricultural waste corn cob particles, followed by a hydrothermal reaction. After filtration and freeze-drying of the filter residue, the CaAl-LDH modified biochar composite material is finally obtained. This invention simultaneously realizes the resource utilization of industrial solid waste and agricultural waste, is green and environmentally friendly, and has low cost. In addition, the ball milling method effectively avoids the consumption of large amounts of alkali solution in traditional processes. Through one-step hydrothermal composite, CaAl-LDH and biochar are more tightly bound, resulting in a composite material with significant synergistic effects in the fields of acidic soil improvement and heavy metal contaminated soil remediation.

The application discloses a soil matrix prepared based on pyrite slag, and a preparation method of the soil matrix, which comprises the following steps: mixing pyrite slag, hair and sulfuric acid together for pretreatment, wherein the weight ratio of the pyrite slag, the hair and the sulfuric acid is 5-10:0.5-2:5-10. In the process of extracting iron elements from the pyrite slag by acid leaching, the hair is added for hydrolysis to obtain hydrolyzed protein, which can well remove heavy metals in the pyrite slag by complexing with heavy metals in the pyrite slag, so that the content of the heavy metals in the pyrite slag is significantly reduced, the soil matrix prepared from the pyrite slag is suitable for plant growth, and the heavy metal pollution of the soil is reduced.

This invention relates to a method for reacting Cu 2+ Pb 2+ A metal-organic framework (MOF) material with highly efficient and complete displacement capability, particularly an adsorbent with CaBDC as its core. This material is synthesized via a solvothermal method, using CaBDC as its core. 2+ A CaBDC structure was formed using a metal node and terephthalic acid (BDC) as the organic ligand. Using ZnBDC as a control system, its effect on Cu was investigated. 2+ or Pb 2+ The adsorption performance of Cu. 2+ or Pb 2+ In wastewater, after stirring or shaking for more than 2 hours, and centrifuging to remove solid precipitate, Cu can be obtained. 2+ or Pb 2+ Pollution removal. CaBDC MOF for Cu 2+ and Pb 2+ The removal capacity is high (maximum approximately 310 and 1015 mg / g), the removal rate is fast (both reach adsorption equilibrium within 60 min), and the removal mechanism is ion exchange. Experimental studies and XRD and SEM images before and after adsorption were used to reflect the synthesized materials and phases. Experimental results show that the adsorption mechanism of CaBDC is Ca... 2+ With Cu 2+ Pb 2+ Complete displacement between them to achieve Cu in aqueous solution 2+ Pb 2+ This invention achieves highly efficient, stable, and irreversible removal, solving the problems of low adsorption capacity, slow reaction rate, and poor selectivity of traditional adsorption materials, while causing no secondary pollution to the environment. This invention provides some inspiration for MOF materials in removing heavy metal pollution from water, and also holds promise for developing more highly efficient, non-toxic, harmless, and large-scale synthesizable novel materials for pollutant removal.

The application discloses a wafer carrying box, which comprises a box body and a box door. The box body has a first internal space for placing a wafer and a front opening as a wafer transmission channel. The box door is used for opening and closing the front opening. The box body and the box door are both made of a plate structure with a metal surface covered with resin composite material. At least one surface of the box body is provided with an exhaust hole penetrating through the plate structure, which is used for vacuumizing the first internal space and isolating the wafer and air through vacuum. The metal base material of the plate structure is used for eliminating static electricity and providing a stable structure for the wafer carrying box in a vacuum environment of the first internal space. The resin composite material on the surface of the metal base material of the plate structure is used for eliminating metal pollution. The application further discloses a wafer carrying box using device and a using method. The application can eliminate the adverse effects of AMC, water vapor and static electricity on the wafer at the same time, thereby reducing wafer surface defects and finally improving product yield.

The application provides a processing method of lithium niobate with sub-10-nanometer resolution. The application combines and synergistically optimizes focused inert gas ion beam direct writing, heat treatment and wet chemical etching process, and finally realizes the etching processing of lithium niobate. The method has high manufacturing precision and can realize sub-10-nanometer resolution; the side wall appearance can be controlled in the range of 90° (vertical side wall) to 120° (inscribed side wall), and the depth-width ratio can be realized from 1:20 to 15:1. Compared with the common lithium niobate processing technology at present, the method can realize high-precision processing only by three steps (one ion irradiation, one heat treatment and one chemical wet etching), and has the advantages of simple manufacturing process, high efficiency, no need to prepare a mask, high flexibility, no introduction of metal pollution, strong matching adaptability with other processes and device design.

This invention relates to the field of metal pollution control technology in mining environments, and particularly to a method for preparing a passivating agent based on tannic acid-modified biochar and its application in pyrite passivation or ecological restoration. The method includes: pyrolyzing bagasse and immersing it in hydrochloric acid for deashing, followed by oxidation in a hydrogen peroxide solution to obtain biochar; mixing the biochar with a tannic acid solution, adjusting the pH of the mixture to 8-8.5, and performing surface modification to obtain the passivating agent. This method solves the problems of biochar materials failing to form a dense and stable protective layer in acidic environments and the insufficient durability of single organic ligand treatments. The passivation layer formed through chemical bonding controls the generation of acidic mine wastewater at its source and improves the oligotrophic environment of tailings ponds, laying the foundation for ecological restoration. Compared to traditional treatments, this invention provides a long-lasting and stable passivation effect, utilizes bagasse as a raw material, has resource advantages, is environmentally friendly, and can improve soil fertility, showing good economic and application prospects.

This invention belongs to the fields of novel graphite materials in the core electronics industry and air pollution control technology in the advanced environmental protection industry. Specifically, it relates to a superhydrophilic boron-doped graphite electrode for electrolysis processes and its preparation method. The electrode includes a graphite substrate and the following functional layers sequentially constructed on the surface of the substrate: a solid-solution boron-doped layer and a surface superhydrophilic oxygen-containing functional group layer. In the solid-solution boron-doped layer, boron atoms are embedded in the graphite lattice, and the surface superhydrophilic oxygen-containing functional group layer is composed of oxygen-containing functional groups introduced by electrochemical oxidation, resulting in a hydrophilic contact angle of less than 10° on the electrode surface. The method includes steps such as mixing graphite powder with a boron source and pressing it into a green body; high-temperature solid-solution boron doping of the green body; crushing, sieving, and secondary shaping; and electrolytic treatment of the electrode for superhydrophilic modification. This invention achieves the reduction of heavy metal pollution through heavy metal anode substitution and the reduction of particulate matter pollution through bubble behavior regulation. It can reduce oxygen evolution overpotential, improve bubble desorption performance, and inhibit graphite oxidation and shedding.