350results about How to "Facilitates electron transfer" patented technology

Novel transition metal complexes of iron, cobalt, ruthenium, osmium, and vanadium are described. The transition metal complexes can be used as redox mediators in enzyme-based electrochemical sensors. The transition metal complexes include substituted or unsubstituted (pyridyl)imidazole ligands. Transition metal complexes attached to polymeric backbones are also described.

The invention provides a smoke catalysis and oxidation denitration process which takes a catalyst using TiO2 or ZrO2-TiO2 as a carrier and Co as active ingredient, uses the oxygen contained in the smoke to oxidate the NO as NO2 which is easy to be dissolved in water, utilizes the alkali solution to absorb the NO2 and remove the NOx. The process of the invention has high denitration efficiency and low cost, can selectively recover the nitrite in the denitration outgrowth and realize the resource utilization of the outcome after controlling the content of the NO2 in the oxidated smoke.

A catalyst for the photo-electrolysis of water molecules, the catalyst including catalytic groups comprising tetra-manganese-oxo clusters. A plurality of the catalytic groups are supported on a conductive support substrate capable of incorporating water molecules. At least some of the catalytic groups, supported by the support substrate, are able to catalytically interact with water molecules incorporated into the support substrate. The catalyst can be used as part of photo-electrochemical cell for the generation of electrical energy.

The invention discloses a method for preparing an immuno biosensor for measuring ractopamine (RAC) in the technical field of chemical detection. Nanogold, a carbon nano tube having conjugated bonding coupled RAC-bovine serum albumin, and prussian blue are modified on a glassy carbon electrode sequentially to obtain the electrochemical immuno biosensor. By the method, the electrochemical immuno biosensor which has high sensitivity, high stability and can quickly test the ractopamine can be prepared.

The invention provides a NiAl-laminated type bimetal hydroxide / carbon nano-tube compound electrode, a preparation method thereof, and an application of the electrode to the electro-catalytic oxidation of glucose. In the electrode, a glassy carbon electrode is taken as a substrate electrode and coated with a layer of film of a NiAl-laminated type bimetal hydroxide / carbon nano-tube compound. The preparation method comprises the following steps of: enabling laminated type bimetal hydroxide to grow in-situ on the surface of carbon nano-tubes by adopting a coprecipitation method to obtain the laminated type bimetal hydroxide / carbon nano-tube compound; then dispersing the compound into a water solution to prepare a solution; dispensing the solution on the surface of the clean glassy carbon electrode; drying at room temperature to volatilize the solvent and obtain the electrode modified by the laminated type bimetal hydroxide / carbon nano-tube compound. The electrode can be used for the electro-catalytic oxidation of the glucose under an alkaline condition and has favorable electro-catalysis performance and stability with simple synthesis method, low cost and wide application prospect.

A metal oxide dispersion comprising metal oxide particles with a necking structure, and a solvent, wherein the liquid droplet contact angle of the metal oxide dispersion to an ITO film (Indium-Tin Oxide type film) formed is from 0 to 60°. A metal oxide dispersion for the production of a dye-sensitized solar cell electrode, comprising Metal Oxide Particle Group F having a necking structure formed by m connected particles, Metal Oxide Particle Group G having only 0.2 m or less connected particles, and a solvent, and being formable into a film at 200° C. or less. A metal oxide electrode comprising an electrically conducting substrate having thereon a metal oxide layer comprising metal oxide particles bound by a binder, wherein the binder content is from 0.005 to 5 mass % based on the metal oxide film and the metal oxide layer has a pencil scratch strength of H or more according to JIS5600.

The invention belongs to the technical field of biological fuel cells, and discloses a phycomycetes microbial fuel cell and a preparation method and application of the phycomycetes microbial fuel cell. The phycomycetes microbial fuel cell comprises an anode chamber, a cathode chamber, a transverse diaphragm, an anode, a cathode and an outer circuit, wherein phycomycetes, a culture solution and a carbon source are respectively installed in the anode chamber and the cathode chamber. In the operation process of the phycomycetes microbial fuel cell, operation is conducted by repeatedly converting the electrodes; in the whole operation process, with the help of synergistic effects of the phycomycetes, the effect that azo dye pollutants are degraded efficiently is achieved; the electrodes are alternately used for degrading the azo dye pollutants, therefore, the physiologically toxic effect on current-producing bacteria by the azo dye pollutants is eliminated, and continuous efficient current generation is realized; the phycomycetes is adopted as a biocatalyst for both the anode and the cathode, no metal catalyst is used for modification, no exogenous artificial mediator is added, aeration is not needed, therefore, the construction and operation cost of the microbial fuel cell is lowered, the sustainability of the microbial fuel cell is enhanced, and industrial amplified production of the microbial fuel cell can be conducted beneficially.

The invention provides a high-property absorption and wave absorption type catalyst for VOCs (Volatile Organic Chemicals) catalytic oxidation. The high-property absorption and wave absorption type catalyst has a structural formula: a Cu-Mn-Ce / TiO2-molecular sieve or a CNDs-Cu-Mn-Ce / TiO2-molecular sieve, wherein CNDs serve as a modifier; Cu and Mn serve as catalytic activity components; Ce serves as a promoted catalytic metal; a TiO2-molecular sieve serves as a carrier. The invention further provides a preparation method of the catalyst. According to the catalyst and the preparation method of the catalyst provided by the invention, the treatment cost is greatly reduced and energy is utilized at maximum through the advantages of the combination of a plurality of materials, so that the relatively good VOCs catalytic oxidation effect can be realized under the microwave irradiation.

The invention provides a low-temperature SCR (Selective Catalytic Reduction) catalyst based on an active coke loaded active component and a preparation method of the low-temperature SCR catalyst. The catalyst is suitable for SCR reaction of nitrogen oxides under the condition of low temperature. A Mn and Ce composite oxide is loaded on an active coke particle with a relatively high special surface area and mechanical strength, so that the SCR reaction temperature is reduced, the adsorption capability and mechanical wear resistance of the catalyst are improved, and the whole sulfate resistance and regeneration capability of the catalyst are improved. The preparation method provided by the invention is simple in step, artful in process design and convenient for industrial production. The catalyst provided by the invention takes the active coke particle as a carrier on which the Mn and Ce composite oxide is loaded. Oxides of modified elements can also be loaded on the carrier of the catalyst, wherein the modified elements are selected from one or more of the following elements: Fe, Zr, Si, Ti, V, Mo, W, Cr, Au, Ag, Pt, Pd, Rh and Co.

A microneedle array device includes a substrate and an array of microneedles on the substrate. Each microneedle includes a redox enzyme and redox mediator and an electrically conductive layer on the substrate. The electrically conductive layer may extend partway up each microneedle exposing the tip thereof.

The present invention pertains to a nano-based sensing device (a sensor) comprising a nano-scale working electrode that can be used for the ultra-sensitive detection of blood analytes, disease biomarkers, and other target molecules. The present invention also pertains to a method for detecting target molecules using the sensor as the sensor element of a microfluidic device.

The invention provides a flexible sweat sensor. The flexible sweat sensor comprises a flexible substrate as well as a glucose working electrode, a lactic acid working electrode and a reference electrode which are arranged on the surface of the flexible substrate. Glucose oxidase (or lactate oxidase) on the electrode is utilized for oxidizing glucose (or lactic acid) in sweat to generate hydrogen peroxide; hydrogen peroxide can directly perform reduction reaction on the electrode; reduction current is detected through an electrochemical workstation and then the concentrations of the glucose andlactic acid in the sweat can be obtained according to the current magnitude and a standard curve. According to the preparation method disclosed by the invention, the response current level is improved by utilizing a Prussian blue layer to speed up the decomposition of hydrogen peroxide; the sensor disclosed by the invention has high sensitivity; the minimum detection limit for the glucose reaches10nM and the minimum detection limit for lactic acid reaches 1mu M.

The invention discloses a negative pole made of a silicon / graphite nanosheet composite material of a lithium ion battery, which comprises the following components in percentage by mass: 85 to 95 percent of nanometer silicon powder-graphite nanosheet composite material, and 5 to 15 percent of polyvinylidene fluoride, wherein the content of nanometer silicon powder is between 20 and 75 percent in the nanometer silicon powder-graphite nanosheet composite material. A preparation method thereof comprises the steps of: preparing graphite oxide, preparing a mixed dispersion system of the nanometer silicon powder and graphite oxide nanosheets; adding a reducing agent, namely hydrazine hydrate into the mixed dispersion system of the nanometer silicon powder and the graphite oxide nanosheets, and reducing the graphite oxide nanosheets into graphite nanosheets to obtain a composite material of the nanometer silicon powder and the graphite nanosheets; and fully mixing the composite material of the nanometer silicon powder and the graphite nanosheets with N-methylpyrrolidone sol of the polyvinylidene fluoride, blending the mixture into paste, evenly coating the paste onto a copper coil, and performing drying and roller compaction. The negative pole made of the silicon / graphite nanosheet composite material of the lithium ion battery has high electrochemical capacity and good cycling stability performance.

The invention discloses an electrochemical sensor used for instantly monitoring and detecting the water biotoxicity. The electrochemical sensor comprises a work electrode, a counter electrode, a reference electrode and a electrolytic cell; the work electrode is a polymer fixed microbial electrode, and the polymer fixed microbial electrode comprises an electrode and a polymer and bacteria mixed layer coated outside the electrode; and the material of the above polymer is gelatin or chitosan, the above bacteria comprise Escherichia coli and / or yeast, and the electrode is a glassy carbon electrode, a gold electrode, a platinum electrode or a boron-doped diamond film electrode. The invention also discloses an apparatus of the electrochemical sensor used for instantly monitoring and detecting the water biotoxicity. The electrochemical sensor can instantly monitor the water biotoxicity change and detect the water biotoxicity value, can realize instant, online and continuous detection, and has the characteristics of high analysis sensitivity, low cost, simple operation, portability and the like.

The invention discloses preparation and an application of a plasma gold / zinc oxide composite nanosheet array device. The preparation of the composite nanosheet array device is that gold nanoparticles are deposited on a zinc oxide nanorod array with an in-situ photodeposition method, and the morphology of the zinc oxide array is gradually converted into a nanosheet structure from a nanorod structure. The synthesized plasma gold / zinc oxide composite nanosheet array device is adopted for efficient photocatalytic reduction of carbon dioxide, illumination is carried out for 3 hours, and the yields of methane and ethane reach up to 95%. The preparation method of the device is simple, experimental conditions are easy to control, and the device is low in energy consumption, low in raw material price, suitable for large-batch production, very friendly to environment, high in carbon dioxide reduction rate under sunlight illumination, good in photocatalytic activity and stability and expectedly applied to actual production of solar fuel.

The invention discloses a preparation method of a ferrite modifying MXene layered gas diffusion electrode. The preparation method comprises the following steps that (1) an MXene material is prepared;(2) ferrite modifies the MXene material; and (3) the layered gas diffusion electrode is prepared. The invention further discloses the ferrite modifying MXene layered gas diffusion electrode and application thereof. The ferrite modifying MXene layered gas diffusion electrode can be used for preparing electrochemical cathode materials which are applied to an electrochemical / ozone coupling water treatment system. The preparation method can easily get the raw materials, the technological operation is simple, the cost is low, the electrode strength is high, the electrochemical catalytic activity ishigh, the dispersity is good, and the water treatment technique consumes low energy and has the high efficiency. The ferrite modifying MXene layered gas diffusion electrode prepared by adopting the method has the wide application prospects on degradation treatment of PPCPs (pharmaceutical and personal care products) pollutants on the three-phase reaction interface.

The invention relates to a method for preparing a steroid immunosensor based on sheet black phosphorus and application and belongs to the technical field of novel biosensing and detection. The sheet black phosphorus is provided with a structure having the property similar to graphene and has good conductivity. Ionic liquid serves as a dispersing agent of the sheet black phosphorus and is applied to a base of the immunosensor. A porous PtAu alloy film is utilized to firm combine a base layer material and an antibody, and the stability of the sensor is enhanced. Base solution potassium ferricyanide is utilized as signals, and ultrasensitive detection of steroid is performed.

The invention provides a high-activity nano-grade flue gas denitrification catalyst for removing nitric oxides in fuel gas under a low temperature condition, and a low-temperature liquid-phase preparation method of the high-activity nano-grade flue gas denitrification catalyst. The method does not relate to high-temperature roasting; and the prepared catalyst exists in a manner of a lot of amorphous state mixed oxides, and the activity is obviously improved. The high-activity nano-grade flue gas denitrification catalyst can be widely applied to selective catalytic reduction reaction of the fuel gas under an SO2-free or low-concentration SO2 environment of the fuel gas, so as to reduce the nitric oxides in the fuel gas into N2 and H2O. The catalyst takes a Ti oxide as a main component and is at least loaded with Mn-Ce-M-Ti-Ox of compound oxides of active components Mn and Ce, wherein M represents one or more elements of Fe, Co, Cu, Cr, Zr, Al and V; and the mol ratio of the elements is as follows: Ti: Mn: Ce: M is equal to 1: (0.005-1): (0.005-1): (0-0.3).

An immobilization carrier containing an electron acceptor compound is used in addition to glutaraldehyde and poly-L-lysine to immobilize an enzyme and an electron acceptor compound simultaneously to an electrode. For example, here are used diaphorase as the enzyme and 2-amino-3-carboxy-1,4-naphthoquinone (ACNQ) as the electron acceptor compound.

A conductive polymer composition comprising: a polymer having a HOMO level greater than or equal to −5.7 eV and a dopant having a LUMO level less than −4.3 eV.

The invention discloses a fluorescent sensing polymer material for detecting nitryl explosives and a preparation method. The preparation method of the material comprises the following steps: taking 2,5- dibromo thiophene, poly(phenyleneethynylene) polymer and 2,7-dibromo-9,9-diphenylfluorene as raw materials; and polymerizing to obtain the fluorescent sensing polymer material. 9,9-Diphenylfluorene and thiophene monomer are introduced to synthesize the poly(fluorenyleneethynylene) polymer (PFEs). The 9,9-diphenylfluorene unit is introduced in the poly(phenyleneethynylene) polymer to weaken Pi-Pi stacking between skeletons, permeability of the polymer is improved, the polymer has rigid steric hindrance, meanwhile, the thiophene unit is introduced to enable the polymer to be rich in electrons, and an electron transfer function of the electrons between the nitro-aromatic compounds and the sensor is promoted.

The invention relates to a wastewater treatment process with an effect of coupling nano magnetite for enhancing the activity of anaerobic microorganisms, and aims at solving the problems that a traditional anaerobic biological treatment system is easy to acidify, instable in performance and the like. Nano magnetite of which the average particle size is smaller than 100nm is prepared by the steps of dissolving ferric salts, precipitating, separating, washing and the like; the nano magnetite and anaerobic sludge are sufficiently and uniformly mixed at a proportion of 1.55gFe / g MLVSS (Mixed Liquor Volatile Suspended Solid) by a stirring method, a nitrogen blowing method and the like; a mixture is cultured by an anaerobic organism treatment device under the constant temperature condition of 35DEG C; with good electrical conductivity and high specific surface area of the nano magnetite, interspecific electron transfer between the anaerobic microorganisms is remarkably enhanced, the activity of the anaerobic microorganisms is greatly improved, and finally, the performance of an anaerobic organism treatment process is improved.

The invention provides a preparation method of a Cu2O hexagram microcrystal composite material having a high-index crystal plane structure and adopting functionalized carbon nano tubes as a carrier. PEDOT (poly(3,4-ethylenedioxythiophene)) functionalized MWCNTs (multi-walled carbon nanotubes) are taken as a carrier, the size of a Cu2O hexagram microcrystal can be remarkably reduced, the dispersity and the utilization efficiency of Cu2O catalysis particles are improved, electro transfer between glucose and a composite material catalyst is facilitated, and the electrocatalytic activity of the Cu2O hexagram microcrystal composite material adopting the PEDOT functionalized MWCNTs as the carrier for glucose oxidation is greatly enhanced, so that a non-enzyme electrochemical glucose sensor established through the composite material has excellent detecting performance. The preparation process of the sensor is simple, and the sensor has wider linear range, lower detection limit and good reproducibility, stability and antijamming capability in the aspect of glucose detection and has a good application prospect in the field of clinical diagnosis, food industrial analysis and the like.

The invention belongs to the field of chemistry, and provides a preparation method of graphene / xylogen-based active carbon; the method comprises the following steps: 1) preparing xylogen-based active carbon; 2) mixing graphite oxide with active carbon to obtain graphite oxide / xylogen-based active carbon compound; 3) activating the compound by alkali, treating with pyrolysis and reduction, so as to prepare graphene / xylogen-based active carbon composite material; 4) preparing an electrode slice. Comparing to the prior art, the obtained graphene / xylogen-based active carbon provides a larger specific surface, a smaller mass transfer resistance, and a better conductivity. Additionally, applying the synthesized graphene / xylogen-based active carbon to the electrode material of a super capacitor is much better than the existing active carbon material from cost and performance.

The invention belongs to the technical field of electrochemical biosensors and particularly relates to an enzyme biosensor for detecting cholesterol as well as a preparation method and an application of the biosensor. The enzyme biosensor adopts a classical three-electrode system, wherein a specific matter recognizing enzyme membrane is solidified on a working electrode and mainly formed by mixing graphene, thionine, cholesterol oxidase, horse radish peroxidase and chitosan. The preparation method of the enzyme biosensor comprises the following steps: firstly uniformly mixing a thionine solution, a chitosan solution of the graphene, a horse radish peroxidase solution and a cholesterol oxidase solution, dripping onto the processed working electrode, forming the three-electrode system together with a reference electrode and a counter electrode to obtain the enzyme biosensor. The enzyme biosensor disclosed by the invention has the advantages of economical efficiency, simplicity, rapidness, sensitivity and the like, is simple in preparation and can be used for the quantitative determination of the cholesterol.

The invention discloses a pyrolytic carbon loaded zero-valent iron (ZVI) composite material, and a preparation method and an application thereof. The method comprises the following steps: mixing natural hematite powder with crushed pine biomass according to a mass ratio, adding water, performing ultrasonic dispersion, drying the obtained raw material mixture, putting the obtained dried raw material mixture into a tubular furnace, carrying out oxygen-limiting pyrolysis in a hydrogen-argon mixed gas atmosphere, raising the temperature to a target temperature of 800-1500 DEG C at a preset heatingrate, and carrying out joint pyrolysis on pine biomass and natural hematite (the main component is Fe2O3) to reduce Fe2O3 into ZVI and generate the composite material PC / ZVI. Doping with graphene and / or p-benzoquinone can supplement functional group loss of a carbon material after high-temperature pyrolysis, further promotes zero-valent iron electron transfer and remarkably improves the heavy metal removal capacity.

The invention relates to a sewage treatment device and particularly relates to a biological membrane electrode and UASB (Upflow Anaerobic Sludge Blanket) coupled reactor comprising a reactor cylinder, a biological membrane electrode system, an electrochemical testing system and a cathode potential testing device, wherein the reactor cylinder internally and sequentially comprises a water distribution plate and the biological membrane electrode system from bottom to top; a sludge bed region is arranged between the biological membrane electrode system and a three-phase separator; the biological membrane electrode system comprises an anode and a cathode; the cathode potential testing device comprises a reference electrode, a salt bridge and sealed electrolyte, wherein the salt bridge is used for communicating the sludge bed region near the cathode and the sealed electrolyte, one end of the reference electrode is connected with the sealed electrolyte, and the other end of the reference electrode is connected with the electrochemical testing system. The biological membrane electrode and UASB coupled reactor provided by the invention is used for promoting the oxidative metabolism of microorganisms to organic pollutants and increasing the COD (Chemical Oxygen Demand) removal rate through the coupling effect of a micro electric field and the microorganisms; meanwhile, the micro electric field can be used for promoting the transfer of electrons in the system and increasing the degradation rate of the pollutants.

The invention provides a MOFs (Metal-Organic Frameworks)-based carbon-cladded ZnO core-shell structure nano-material and a preparation method thereof and relates to a ZnO composite nano-material and apreparation method thereof, aiming at solving the technical problem that the decomposition speed is slow when an existing single ZnO catalyst is used for catalyzing thermal decomposition reaction ammonium perchlorate. The nano-material provided by the invention is a nano-sphere which takes a ZnO spherical nanoparticle as a core and carbon as a shell. The preparation method comprises the followingsteps: 1, dissolving zinc acetate in diethylene glycol and reacting, and taking supernatant; 2, then dissolving the zinc acetate in the diethylene glycol; adding the supernatant and reacting to obtain ZnO nanoparticles; 3, enabling 2-methylimidazole and the ZnO nanoparticles to react to prepare 2-methylimidazole zinc salt cladded ZnO core-shell structure spherical particles; 4, calcining to obtain the carbon-cladded ZnO core-shell structure nano-material. When the material is used for catalyzing thermal decomposition of AP, a decomposition peak is advanced to 293 to 295 DEG C and the apparentdecomposition heat reaches 1,420 to 1,435J / g, so that the material can be applied to the field of catalysis.

The invention discloses a graphene / single-walled carbon nanotube / hemin (RGO-SWCNT-Hemin) nanocomposite, a preparation method of the nanocomposite and application of the nanocomposite for detection of the concentration of hydrogen peroxide. Firstly, hemin is dissolved in tetrahydrofuran in an ultrasonic mode and added to distilled water, and NaNO3 and SWCNTs continue to be added in an ultrasonic mode; two high-purity graphite rods serving as a positive electrode and a negative electrode are inserted into mixed liquor, 10V direct voltage is applied to the two graphite rods under ultrasonic conditions, electrolysis is conducted for 8 hours, sediment on the lower layer of the liquor is centrifugally removed after the reaction finishes, the mixed liquor is then subjected to centrifugal washing, and the RGO-SWCNT-Hemin nanocomposite is obtained. There is no literature report about the nanocomposite at current, the preparation method is simple, and the nanocomposite can be produced on a large scale. Besides, the H2O2 detection sensitivity of the nanocomposite is high.

The invention discloses lithium iron phosphate anode materials of a three-dimensional conductive network structure and a preparation method thereof and belongs to the technical field of lithium ion battery anode materials. The materials are compound materials composed of lithium iron phosphate (LFP), electrochemical stripping graphite oxide (ECGO) and a carbon covering film, and the materials are of the three-dimensional structure that the outer layer is covered with the carbon film and the ECGO is connected with the LFP molecules internally. The preparation method comprises the steps that graphite block materials are stripped by the electrochemical oxidation technology, and the ECGO which is good in hydrophilia and electrical conductivity is obtained; the LFP (LFP / ECGO) with the surface combined with a large amount of ECGO is prepared by the hydrothermal method; a layer of carbon film is formed on the surface of the LFP / ECGO by the pressure burning technology. The electrical conductivity performance of the materials can be improved, and the specific capacity and tap density of the materials are not affected much. According to the obtained LFP anode materials (LFP / ECGO) of the 3D conductive network structure, compared with the pure LFP, LFP / ECGO or LFP / C, the electrochemical performance of the LFP / ECGO / C materials is the best.