16 results about "Nitrate pollution" patented technology

The invention relates to a CdS / denitrifying bacteria hybrid system as well as a construction method and application thereof, and relates to the technical field of water nitrate pollution treatment. Comprising composite denitrifying bacteria, Zn-doped CdS heterojunction nanoparticles loaded on the surface of the composite denitrifying bacteria, and an electronic mediator anchored at the interface of the heterojunction nanoparticles and a flora, the composite denitrifying bacteria are prepared from Stutzeria balearica CXK-1 and Stutzeria balearica GUA-1 according to the volume ratio of the Stutzeria balearica CXK-1 to the Stutzeria balearica GUA-1 to the Stutzeria balearica GUA-1 to the Stutzeria balearica GUA-1 being 1 to (0.8 to 1.2). The hybrid system can utilize photoelectrons to drive microbial denitrification under an illumination condition, so that the reduction of nitrate radicals is realized, and the effect of water treatment is achieved.

The invention discloses a two-dimensional metal phosphorus chalcogenide piezoelectric catalyst and preparation and application thereof.The catalyst comprises a block material and a two-dimensional nanosheet obtained through ultrasonic stripping of the block material, and the two-dimensional metal phosphorus chalcogenide piezoelectric catalyst has a piezoelectric effect, can capture environmental mechanical energy such as water flow, ultrasonic waves and wind energy and drives a piezoelectric catalytic reaction to convert nitrate into ammonia. The material is prepared by combining vacuum chemical vapor transport with an ultrasonic stripping method, and the material with high quality and good stability can be synthesized in batches. During application, the catalyst is dispersed in water or integrated into a film, and nitrate pollutants in sewage can be efficiently converted and ammonia is synchronously generated under the action of mechanical energy such as ultrasound, stirring or water flow fluctuation. The process is simple and reliable, and a feasible new technical path is provided for realizing nitrate pollution abatement and green synthesis of ammonia.

The application relates to the field of active nitrogen testing, and discloses a double-flow reactor experimental device for measuring active nitrogen emission and reaction rate, which comprises a reaction mechanism and an irradiation mechanism, the reaction mechanism comprises a first reactor, the outer surface of the first reactor is provided with a constant-temperature water layer, a second reactor is connected with the first reactor through a first connecting pipe, an ozone analyzer is installed on the first connecting pipe, and two dryers are installed on the first connecting pipe; the constant-temperature water layer outside the first reactor in the reaction mechanism can stably control the temperature and store soil samples; the second reactor is connected with the first reactor through the first connecting pipe and is used for particulate matter film samples; the ozone analyzer, an NOx analyzer and the dryers on the first connecting pipe can synchronously detect the concentrations of related gases, and the dryers can eliminate water vapor interference; the double-flow reactor experimental device solves the problem of measuring key parameters of active nitrogen under the background of farmland nitrogen application and nitrate pollution in urban groups, and has the advantages of synchronous analysis of multiple parameters, accurate simulation of environmental conditions, low-interference detection and the like.

The application discloses a method for simultaneously treating domestic sewage and underground sewage based on a BES system of autotrophic denitrification and anaerobic ammonia oxidation, and belongs to the fields of environmental engineering and wastewater treatment. The method is specifically based on a BES system, and simultaneously solves the problems of ammonia nitrogen removal of domestic sewage and nitrate pollution of underground water through cathode coupling autotrophic denitrification and anaerobic ammonia oxidation technology. Specifically, an anode chamber biological electrode is arranged in an anode chamber, a cathode chamber biological electrode is arranged in a cathode chamber, the anode chamber electrode and the cathode chamber electrode are connected through external wires and an external resistance, domestic sewage is pumped into the anode chamber through a peristaltic pump, nitrate-rich underground water is pumped into the cathode chamber through the peristaltic pump, and the reacted anode liquid is pumped into the cathode chamber through the peristaltic pump. That is, the application innovates the design of the BES system and the water inlet mode, significantly improves the denitrification efficiency, and also realizes energy output.

The invention discloses an iron-based perovskite oxide catalyst for synthesizing ammonia through nitrate electrocatalytic reduction. The structural general formula of the iron-based perovskite oxide catalyst is ABO3-delta (0 < = delta < = 1) and AA 'BB' O6. Wherein the A site of the ABO3-delta (0 < = delta < = 1) type perovskite oxide is composed of rare earth or alkali metal elements, and the B site is composed of an iron element. An A site and an A'site of the AA 'BB' O6 type perovskite oxide are respectively composed of a rare earth element and an alkali metal element, a B site is an iron element, and a B 'site is a molybdenum element. The catalyst shows nitrate reduction reaction (NO3RR) activity superior to that of a commercial iron oxide material in alkaline electrolyte, and the enhanced catalytic effect of the catalyst is derived from remarkably improved reaction mass transfer efficiency and active site density. Experimental results show that the catalyst system has excellent cycle stability and operation durability, and keeps stable catalytic performance under continuous operation conditions. The invention provides a novel catalytic material solution with practical value for water nitrate pollution abatement and green ammonia synthesis technology.

The invention belongs to the field of water pollution treatment, and particularly relates to a method suitable for ion type rare earth mine area groundwater pollution remediation. An in-situ chemical reduction area and an in-situ microbial enhanced purification area are sequentially arranged in the water flow direction, the in-situ chemical reduction area comprises a primary treatment area, a metal ion capture area and an adsorption reduction area, and a metal ion capture agent with a graphene-loaded nanoscale zero-valent iron composite material and lignin active powder loaded on a porous carrier is designed; the in-situ microbial enhanced purification area comprises a nitrification area and a denitrification area; according to the remediation method, chemical reduction, physical adsorption and microbial remediation are coupled, deep treatment of the ionic rare earth mine underground water polluted by heavy metal and polluted by rare earth ions, ammonia nitrogen and nitrate is achieved through mutually independent, synergistic and multi-stage treatment, the removal rate of the ammonia nitrogen can reach 99% or above, and the removal rate of the heavy metal and the rare earth ions can reach 100%.

The invention discloses a manufacturing method of an electrode for electrocatalytic reduction of nitrate, an electrode product and application, and belongs to the technical field of electrochemical water treatment in environmental engineering. The titanium-based cobalt-doped tin dioxide electrode with the double-layer structure is prepared by adopting a sol-gel-step heat treatment method, the bottom layer is an antimony-containing cobalt tin oxide conductive layer, the surface layer is an antimony-free cobalt tin oxide catalytic layer, and the molar ratio of tin to cobalt in the two layers is (5: 1)-(7: 1). The long-standing technical prejudice that a titanium-based antimony-doped tin dioxide electrode can only be used for anodic oxidation and cannot be used for cathode nitrate reduction in the field is overcome, the Faraday efficiency of the prepared electrode in high-concentration nitrate wastewater of 1000 mg / L is as high as 97.2%, the ammonia nitrogen selectivity is 99.3%, the performance degradation is only 6.3% after continuous operation for 500 h, and the prepared electrode has a good application prospect. The catalyst has high catalytic activity, high product selectivity and long-term operation stability, is suitable for treatment of various nitrate-polluted water bodies, and can synchronously realize harmless treatment of pollutants and resource recovery of ammonia nitrogen.

The application discloses a preparation method of a copper-cobalt-doped carbon nitride electrocatalyst, and a product and application thereof. The copper-cobalt-doped carbon nitride electrocatalyst is prepared by taking 3-amino-1,2,4-triazole as a precursor, 1,10-phenanthroline as a ligand, and a copper source and a cobalt source as metal sources, and has a C3N5 carrier and Cu / Co dispersed in the carrier. The catalyst has rich active sites and excellent conductivity, and through the synergistic effect of copper and cobalt, the hydrogen evolution side reaction is inhibited, and the activity, selectivity and stability of the electrocatalytic reduction of nitrate to produce ammonia are improved. The problems of low activity, low faradic efficiency, poor stability and high cost of the existing electrocatalytic nitrate reduction ammonia catalyst are effectively solved. The preparation method adopts a non-noble metal + non-metal substrate, raw materials are easy to obtain, the preparation process is simple, and the cost is low, and thus the method can realize large-scale production. The obtained catalyst is suitable for the field of electrocatalytic reduction of nitrate to produce ammonia, can realize water nitrate pollutant treatment and high-value ammonia resource recycling, and has dual benefits of environmental protection and economy.

Electrochemical conversion of nitrate to ammonia is an approach to alleviate nitrate pollution in water and simultaneously generate green NH3 fuels. The practical application of this approach is challenging due to the lack of efficient electrocatalysts. The present disclosure relates generally to an electrocatalyst including a plurality of CuWO4 hollow nanospheres, which include asymmetric oxygen vacancies and adjacent Mo clusters, and methods of making and using the same. The electrocatalyst of the present disclosure is designed for efficient ammonia electrosynthesis.

This invention relates to the field of groundwater pollution detection technology, specifically providing an in-situ detection device for nitrate pollution in groundwater. The mounting body has a clamping portion for mounting on one side of the wellhead; the clamping assembly includes a first clamping member driven by a first driving member, which is disposed opposite to the clamping portion and can move under the drive of the first driving member to clamp or release the edge of the wellhead; the deployment assembly includes a winding mechanism and a locking structure driven by the first driving member, the locking structure unlocking or locking the winding mechanism under the drive of the first driving member; the detection unit is connected to the winding mechanism via a flexible member, and when the winding mechanism is unlocked, the flexible member is allowed to release, allowing the detection unit to fall under its own weight. This invention uses a single driving member to simultaneously drive the clamping assembly to complete both wellhead fixing and locking structure unlocking of the winding mechanism, achieving a continuous action between device fixing and detection unit deployment, significantly improving on-site operation efficiency and reducing operational complexity.

The invention discloses a method and equipment for simulating nitrate pollution hydrological remaining time in an underground water system, and relates to the field of hydrogeology and environment simulation, and the method comprises the steps: obtaining the geometric dimension, hydrological physical parameters and geochemical parameters of a target underground water system, and building an ideal basin concept model of a flux upper boundary, constructing a mathematical model with coupled water flow-solute transport-groundwater age distribution; simulating groundwater flow, solute transport and transformation process, groundwater age and life expectancy distribution under a steady-state condition and solute transport and transformation process under an unsteady-state condition based on the constructed model; and determining the characteristic hydrological leaving time of the nitrate under a steady state condition, and determining the hydrological leaving time of the nitrate under an unsteady state condition at the same time. According to the simulation method for the nitrate hydrological remaining time, quantitative calculation of the nitrate pollution lag time in an underground water system is achieved, and a direct basis is provided for pollution source tracing, treatment scheme making and effect pre-judgment.

The application belongs to but is not limited to the technical field of new energy batteries, and discloses a photocatalytic fuel cell system based on a heterojunction structure for pollutant treatment and a preparation method thereof. Based on a PFC system, antibiotic pollutants are oxidized at an anode, and nitrate pollutants are reduced at a cathode. An energy difference between Fermi energy levels of an anode heterojunction and Fermi energy levels of a cathode heterojunction drives system electron transfer to output electric energy. Based on the reaction principle of the PFC, nitrate existing in wastewater is used as a cathode electron acceptor, and the reduction of nitrate pollutants to synthesize ammonia and the oxidation of organic pollutants are realized in cooperation, so that the two kinds of pollutants at the anode and the cathode are synchronously removed.

A process for synthesizing ammonia (NH3) with semiconductor nanoparticles is provided. The process involves production of ammonia (NH3) through photocatalytic reduction of nitrate (NO3 -) and nitrite (NO2 -) ions using indium phosphide (InP) quantum dots (QDs) under visible light irradiation. The process utilizes InP QDs as an effective photocatalyst, 5 achieving NH3 yields ~ 94% within 2 hours at room temperature. The process provides selective NH3 production with minimal by-products, effective operation at low substrate concentrations (down to 250 μM), and reduced toxicity compared to traditional quantum dot materials. The process not only addresses the environmental concerns associated with nitrate pollutants but also contributes to sustainable ammonia production, making it suitable for 0 applications in energy and water remediation sectors.

The application discloses a simulation method and equipment for nitrate pollution hydrological residual time in a groundwater system, and relates to the field of hydrogeology and environmental simulation. The method comprises the following steps: obtaining the geometric size, hydrological physical parameters and geochemical parameters of a target groundwater system, establishing an ideal basin conceptual model of a flux upper boundary, and constructing a mathematical model coupling water flow, solute transport and groundwater age distribution; simulating the groundwater flow, solute transport and transformation process, groundwater age, expected life distribution under steady-state conditions and the solute transport and transformation process under non-steady-state conditions based on the constructed model; and determining the nitrate characteristic hydrological residual time under steady-state conditions and the nitrate hydrological residual time under non-steady-state conditions. The application provides a simulation method for nitrate hydrological residual time, realizes quantitative calculation of the nitrate pollution lag time in the groundwater system, and provides direct basis for pollution tracing, treatment scheme formulation and effectiveness prediction.

The invention belongs to the technical field of electrocatalytic materials and energy conversion, relates to a polyacid-based complex based on a heterocyclic fused aromatic ligand, a preparation method of the polyacid-based complex and application of the polyacid-based complex to electrocatalytic reduction of nitrate to synthesize ammonia, and aims to solve the problem that an existing polyacid catalyst is insufficient in ammonia production rate in neutral electrolyte. The invention provides a crystal with a chemical formula of [(HNCP) Ni (H2O) 4] 3 [PW12O40] (HNCP is 2-(4-(4-carboxyl phenyl) phenyl) imidazo (4, 5-f) (1, 10) phenanthroline) through a heterocyclic fused aromatic ligand-metal ion-polyacid collaborative design. The preparation method comprises the following steps: dispersing phosphotungstic acid, nickel chloride and HNCP in an ethanol-distilled water mixed solvent, adjusting the pH value, and carrying out solvothermal reaction at 150 DEG C to obtain the product. The maximum ammonia production rate of the complex in a neutral electrolyte at normal temperature and normal pressure can reach 7.66 mg.h <-1 >. Mg-1. Cat., and the complex has important application value in the fields of energy storage and conversion and nitrate pollution abatement.

The invention discloses a bismuth-based metal-organic framework loaded nanocluster material and application thereof, and belongs to the technical field of material chemistry. The bismuth-based metal-organic framework loaded nanocluster material is obtained by carrying out electrochemical in-situ reconstruction on a bismuth-based metal-organic framework material under a strong acid condition, and can be used for electric synergistic catalysis of nitrate and pyruvic acid. The method not only can effectively remove nitrate pollutants, but also can efficiently and selectively synthesize amino acid, and shows excellent product selectivity and potential economic value. A new strategy is provided for nitrate pollution treatment, nitrate is expected to be converted into a high-value amino acid product, and the win-win situation of environmental treatment and resource utilization is achieved.