16results about How to "Facilitates electron transfer" patented technology

The invention relates to a bioelectrochemical sensor used for detecting hydrogen peroxide and a manufacturing method of the bioelectrochemical sensor. The novel bioelectrochemical sensor is a sensor with a three-electrode system, wherein the counter electrode is a platinum electrode, the reference electrode is saturated calomel electrode and the working electrode is gold electrode. The sensor is based on orientation combination of a polypeptide horse radish peroxidase with characteristic sequence, the promotion effect of the polypeptide horse radish peroxidase on the activity of the enzyme and the characteristic of high sensitivity of electrochemical detection methods. The sensitivity of hydrogen peroxide sensors is effectively improved and satisfactory results are obtained.

The invention belongs to the technical field of NH3 catalytic oxidation catalysts, and particularly relates to a preparation method and application of a surface defect-rich catalyst for NH3 catalytic oxidation, and the preparation method comprises the following steps: (1) mixing heteropolyacid, a molecular sieve and deionized water, grinding, carrying out vacuum drying, and calcining in an inert atmosphere to obtain catalyst carrier powder; (2) weighing a manganese precursor salt and an auxiliary agent precursor salt, dissolving the manganese precursor salt and the auxiliary agent precursor salt in water to prepare an aqueous solution, adding the catalyst carrier into the aqueous solution of the manganese precursor salt and the auxiliary agent precursor salt, carrying out vacuum drying, and calcining in an inert atmosphere to obtain a supported catalyst; and (3) reducing the supported catalyst in a mixed reducing atmosphere containing CO / inert gas to obtain the catalyst with rich surface defects. According to the method disclosed by the invention, rich defect sites can be constructed on the surface of the catalyst, the NH3 catalytic oxidation activity of the catalyst under a wide temperature window is promoted, and meanwhile, the N2 selectivity is improved.

The invention provides a layered lattice iron bifunctional catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a layered structure material with deionized water to obtain slurry, adding the slurry into a nucleation reactor, violently stirring, and circularly stirring for multiple times; then collecting the slurry, centrifuging, and carrying out vacuum drying on the obtained solid material to obtain a purified material; and calcining the obtained material at high temperature for structural evolution to obtain the layered lattice iron bifunctional catalyst. The layered lattice iron bifunctional catalyst provided by the invention has a unique pore structure, a large specific surface area and wide pore distribution, effectively adsorbs and enriches organic pollutants in water, provides driving force for Fenton oxidative degradation of low-concentration organic pollutants, and improves the Fenton oxidative degradation efficiency; the layered lattice Fe exists in the catalyst in the form of an aluminum-oxygen-iron covalent bond, the Fe stability is improved, the Fe dissolution amount is extremely low in the oxidative degradation process, no iron mud is generated, and continuous removal reaction and recycling of the catalyst are facilitated.

This invention relates to the field of industrial wastewater treatment technology, and discloses an electrocatalytic oxidation device and its operating method for treating saline industrial organic wastewater. Wastewater enters the reaction chamber through the bottom inlet, is forced through the anode channels, and undergoes an electrochemical oxidation reaction on the anode surface to convert chloride ions into hypochlorous acid. A vacuum ultraviolet light source performs in-situ photolysis of water molecules and hypochlorous acid, exciting various active species, including strongly reducing hydrated electrons, strongly oxidizing hydroxyl radicals, and chloride radicals. This device, through the construction of a reduction-oxidation system, can efficiently degrade various pollutants with both electron-rich and electron-deficient characteristics. This invention utilizes the synergistic coupling of electrochemical generation and photochemical conversion to convert high-concentration chloride ions into active precursors, effectively overcoming the bottlenecks of low degradation efficiency and poor selectivity in traditional technologies for high-salt and complex water quality, and significantly improving the system's mineralization efficiency and energy utilization rate.

The present application relates to the application of open-cage borane compounds in the preparation of immunosuppressants, belonging to the technical field of biological medicine. The open-cage borane compounds of the present application include nest borane compounds and / or spider web borane compounds, and the pharmaceutically acceptable solvates or pharmaceutically acceptable complexes of the nest borane compounds and the spider web borane compounds. The open-cage boron clusters of the present application have dehydrogenase-like activity, can catalyze the dehydrogenation reaction of hydroxyl-containing organic substrates in a biological system, promote the conversion of NAD(P) + to NAD(P)H, further improve the intracellular oxidation-reduction ratio, induce cell redox stress, and further reshape the metabolic pattern of HSCs from the source, promote the differentiation of immune cells to immunosuppressive phenotype, and play an immunosuppressive role.

The present invention provides a bioelectrochemical system and method for enhancing plastic degradation. The method of the present invention utilizes a bioelectrochemical system to couple electroactive plastic degrading bacteria to enhance the degradation of plastics in the environment. The device is composed of an anode system and a cathode system. The electroactive plastic degrading bacteria and the plastic are both located in the anode system and the cathode system. The anode system is placed in a sedimentary layer in an actual environment, and the cathode system floats on the water surface. The two are connected by wires and resistors and fixed with a barrel. The electroactive plastic degrading bacteria can not only degrade plastics, but also provide electrons to the bioelectrochemical system, promote electron transfer in the bioelectrochemical system, and further accelerate the degradation of plastics. Under the dual strengthening effects of the bioelectrochemical system and the electroactive plastic degrading bacteria, the method realizes the enhanced degradation of plastics. The method has low cost and low energy consumption. It can also recycle electrical energy while accelerating the restoration of the water environment, and has good economic benefits and application prospects.

The invention relates to the technical field of agriculture, in particular to a method for fusing anaerobic fermentation compost, which comprises the following steps: mixing organic waste raw materials, and adding sodium citrate and magnesium sulfate for treatment; feeding the treated raw materials into an anaerobic reactor, adding an iron-based core-shell structure material, controlling the pH value of the system, and carrying out anaerobic fermentation to obtain digestion residues; bicarbonate and sodium citrate are added into the digestion residues to be mixed; and entering an aerobic composting stage, controlling the moisture content of the pile body under an oxygen supply condition, heating the pile body, maintaining the pile body to enter a decomposition stage, and carrying out natural aging to produce a decomposed organic fertilizer. In the invention, by virtue of the porous structure and surface characteristics of the iron-based core-shell structure material, not only is the stability of the fermentation process ensured, but also the microbial electron transfer process is optimized, and the methane production efficiency is improved; the compound microbial agent effectively increases the number of effective microbial communities, improves the temperature and ventilation conditions in the composting process, and ensures uniform decomposition of the organic wastes.

The utility model relates to a multi-stage ecological interception ditch for agricultural non-point source pollution prevention and control, which is suitable for agricultural non-point source pollution prevention and control. Comprising a ditch body, ecological protection slopes are arranged on the two sides of the ditch body, slope plants are arranged on the slopes of the ecological protection slopes, a plurality of interception dams are distributed in the ditch body in a staggered mode to form a snakelike overflowing channel, the upstream side of each interception dam is provided with a slag blocking net, the upper edge of each slag blocking net is higher than the water surface, and the area between every two adjacent interception dams is a purification area. By arranging multiple stages of interception units, the retention time of a water body is greatly prolonged, so that the sewage treatment and purification efficiency is further improved. Through multiple effects of physics and microorganisms, the filtering and conversion performance of the ecological interception ditch on nitrogen and phosphorus in water is improved, and then the purification effect of the ecological ditch is integrally improved.

This invention provides a permeable reactive wall process and its application for simultaneously removing hexavalent uranium and sulfate from groundwater. The permeable reactive wall process consists of a first treatment unit and a second treatment unit arranged sequentially along the water flow direction. The first treatment unit is filled with a first reaction medium, including zero-valent iron, sulfur-modified coconut shell charcoal, and sulfate-reducing bacteria. The second treatment unit is filled with a second reaction medium, including zero-valent iron, ferric oxide, sulfur-modified coconut shell charcoal, and *Priestia* sp., a non-pathogenic and environmentally friendly bacterium that can simultaneously remove uranium from water through adsorption and reduction. The composite permeable reactive wall process provided by this invention has strong resistance to interference from other substances in the water. When used to simultaneously remove sulfate and hexavalent uranium from groundwater at 15–35°C, the removal rates of both sulfate and uranium in the groundwater are greater than or equal to 90%.

The application discloses a method for promoting As oxidation by activating goethite with antibiotic molecules, and comprises the following steps: S1, goethite preparation; S2, adjusting the pH of a solution containing antibiotic molecules and trivalent arsenic to 5.5-6.5, adding goethite, and carrying out reaction in dark at 23-27 DEG C and 150-190 rpm for 2-72 h to realize the activation of goethite by antibiotic molecules and further complete As oxidation; wherein the concentration of antibiotic molecules in the solution is 45-55 mu M, the concentration of trivalent arsenic is 2.67 mu M, and the adding ratio of goethite to the solution to be treated is 30-50 mg:20 ml; the application firstly proposes that antibiotic molecules can complex and reduce the surface Fe(III) of goethite to generate Fe(II), further promotes the oxidation of As(III), and provides a brand-new treatment mode for the pollution conversion of composite pollutants.

This invention belongs to the field of nanoenzyme technology, specifically relating to a method for preparing gold magnetic nanoenzymes and a method for enhancing their catalytic activity. Citric acid is added to an aqueous dispersion of Fe3O4 and mixed to obtain citric acid-modified magnetic Fe3O4 nanoenzymes. The citric acid-modified magnetic Fe3O4 nanoenzymes are then added to a solution containing a reducing agent and mixed to obtain a dispersion. A gold-containing compound is added, and the mixture is heated to its boiling point until the solution changes from black to brownish-yellow. The solution is then centrifuged, washed, and magnetically separated. The resulting brownish-yellow substance is redispersed in water to obtain a gold magnetic cascade nanoenzyme. The prepared gold magnetic cascade nanoenzyme possesses cascade catalytic reaction activity.

This invention discloses a method for preparing an iron / carbon quantum dot / biochar composite photocatalytic material and its application, belonging to the field of catalytic decomposition technology. Waste wolfberries are carbonized in an aqueous solution of 0.02–2 mol / L K₄[Fe(CN₆)]·3H₂O at 180–200°C for 6–8 hours. The resulting mixture is then centrifuged at 8000–10000 rpm for 10 minutes to separate the lower solid layer. This lower solid layer is dried at 60–80°C for 6 hours, ground, and sieved to obtain the iron / carbon quantum dot / biochar composite material. This invention uses a one-step synthesis method, eliminating the need for secondary composite processes and avoiding cumbersome and energy-intensive preparation steps. The resulting biochar material can be used as a purification material for sulfonamide and fluoroquinolone antibiotics in water, effectively solving the problem of sulfonamide and fluoroquinolone antibiotic pollution in aquatic environments requiring removal.

The invention discloses a catalyst for synthesizing cyclic carbonate and a preparation method of the catalyst. The catalyst is MO (at) Ag-HOF; wherein Ag-HOF represents a hydrogen bond organic framework material [Ag (HMCTA) (H2MCTA)] synthesized from AgNO3 and 5-methyl-1-(4-carboxyl phenyl)-1H-1, 2, 3-triazole-4-formic acid (H2MCTCA), and the chemical formula of the Ag-HOF is shown in the description. When the MO-Ag-HOF catalyst is used for cyclization synthesis of trimethylene carbonate from CO2 and 3-chloro-1-propanol, the catalytic activity is high, the reusability is good, and the yield of the product is greatly improved.

This invention discloses a method for enhancing electron transfer in a longitudinal phase-separation anaerobic reactor. This method achieves efficient degradation of various recalcitrant organic wastewaters and efficient biogas recovery in the anaerobic reactor. By longitudinally partitioning the reactor, relative phase separation of the acid-producing and methanogenic stages is achieved. Precise addition of acid-producing and methanogenic phase media materials through phase separation enhances the electron transfer process in the anaerobic treatment, resulting in a faster electron transfer rate, improved stability and pollutant treatment efficiency, shorter reactor start-up time, smaller footprint, easier control, lower cumulative effects of intermediate products such as VFAs, and higher treatment efficiency and energy recovery rate.

The invention discloses an oxygen-enriched defect type iron-copper-aluminum nano flower-shaped catalyst for efficiently and synergistically degrading NO and methylbenzene and a preparation method of the oxygen-enriched defect type iron-copper-aluminum nano flower-shaped catalyst. The catalyst is characterized in that CuO and Al2O3 are doped into Fe3O4 through a one-step in-situ synthesis method, the catalyst is prepared through a double-titration anion intercalation method, FeSO4. 7H2O, Cu (NO3) 2.3 H2O and Al (NO3) 3.9 H2O serve as metal sources, Fe3O4 accounts for 55%-65% of the total mass of the catalyst, and the doping amount of CuO is 25%-30%, and the doping amount of Al2O3 is 10%-15%. The prepared catalyst is of a nanoflower-ball-shaped mesoporous structure, has a large specific surface area and rich oxygen vacancies and active sites, not only has excellent performance of synergistically degrading NO and toluene at medium and low temperatures, but also has stable sulfur and water resistance, is green, safe, environment-friendly and low in energy consumption, and has a wide industrial application prospect.

According to the bifunctional nano-enzyme-based bimodal food-borne pathogenic bacterium detection method and kit disclosed by the invention, an identification probe is a bifunctional probe of an Au-coated PB nano-enzyme modified pathogenic bacterium specific antibody Ab2, and a colorimetric-Raman bimodal detection system is constructed by matching with an Ab1 modified magnetic capture probe and a Raman label and combining a magnetic separation technology; the dual-mode detection system has the advantages of high sensitivity (LDD = 1.9 CFU / mL), high specificity, simplicity and convenience in operation, rapidness and stability when being used for detection, the reliability and accuracy of detection are remarkably improved through mutual verification of two modes of Raman detection and colorimetric detection, and the dual-mode detection system is suitable for on-site rapid detection of food-borne pathogenic bacteria in food matrixes such as fruit juice and the like and has a wide application prospect. And an effective technical means is provided for food safety detection.