131results about How to "Efficient catalytic activity" patented technology

The invention discloses a method for preparing a heterogeneous-phase Fenton catalyst and an application thereof, which belong to the fields of waste comprehensive utilization and water treatment. The method comprises the following steps: cleaning waste iron filings and biogas residue, drying the materials, crushing the materials, doping and dipping the materials, activating the materials at high temperature, pickling a sample and screening the sample to obtain the heterogeneous-phase Fenton catalyst. The method of the catalyst has the advantages of simple and easy operation, and saved preparation cost, effectively solves the resource utilization problem of waste iron filings and biogas residue, which belongs to the preparation technology of the sustainable development catalyst. The catalyst is used for processing difficultly-degraded waste water while being used for catalysis of Fenton, the pH value is not required to be adjusted, the pollutant removal effect is good, secondary pollution of iron filings and metal ions cannot be generated, the catalyst activity is not obviously changed through continuous operation with more than 600 hours, the catalyst has stable catalysis performance and good application performance, and is suitable for industrial popularization and application.

The invention belongs to the technical field of biology, and relates to a preparation method and application of shewanella spp-nanometer ferrous sulfide capsules. The method comprises the steps that an LB culturing medium and an M9 culturing medium are prepared, shewanella spp is inoculated to the LB culturing medium for culturing, and bacterial liquid is obtained; the LB culturing medium and theM9 culturing medium are mixed, sodium lactate, calcium chloride and magnesium sulfate are added, and reaction buffering liquid is obtained; then, the bacterial liquid is centrifuged, bacterial sludgeis added into the reaction buffering liquid until the OD 600 value is 0.05-5; then, a ferric chloride solution and a sodium thiosulfate solution are added into the reaction buffering liquid after inoculation of the bacterial sludge, and after culturing, centrifugation, washing and resuspending, the shewanella spp-nanometer ferrous sulfide capsules are obtained; in the process of synthesizing the capsules, the activity of the biological metabolism mechanism is fully utilized, the raw materials are simple and cheap, the application cost is low, and quantization production can be achieved; multi-period efficient removal for hexavalent chromium is efficiently achieved, and a new method is provided for efficiently processing heavy metal pollution.

The invention aims to provide a method for treating waste alkaline residues of a refinery plant. The method includes the steps that waste alkaline water of the refinery plant is delivered into a dilution tank and diluted with water according to the ratio of 7-15:1, the diluted waste alkaline water is delivered into a neutralization tank, the pH value is adjusted to 7-9 with a neutralization agent, then the waste alkaline water is delivered into an ozone-light wave catalytic oxidation reactor which is provided with a solid catalyst and an ultraviolet light generator inside, ozone is led into the ozone-light wave catalytic oxidation reactor, the waste alkaline water makes even and full contact with the ozone, the catalyst and ultraviolet light with catalytic oxidation reaction generated, foam generated in the reaction is led into a demister at the top of the ozone-light wave catalytic oxidation reactor, the demister performs foam killing, waste gas generated in the reaction is led into an incinerator through an exhaust pipe at the top of the demister, and the waste alkaline water treated through ozone-light wave catalytic oxidation is delivered into a waste water treatment plant to be further treated. By treating the waste alkaline residues through the method, the removal rate of various components of the waste alkaline residues is high, and the difficulty of further treatment of the waste water is greatly lowered.

The invention relates to the application of nano-nickel oxide as a mimetic peroxidase for detecting hydrogen peroxide. Nano-nickel oxide serves as the mimetic peroxidase and has the activity of the mimetic peroxidase; the particle size of nano-nickel oxide is not limited to 4nm, and nano-nickel oxide further contains nano-nickel oxide particles of other sizes. For the first time, nano-nickel oxide is found to have the function of the mimetic peroxidase and can be applied to detecting the content of hydrogen peroxide; compared with HRP, prepared nano-nickel oxide, serving as a catalyst, is high in stability and reusable, and has efficient mimetic peroxidase catalytic activity; in the absence of hydrogen peroxide, nano-nickel oxide is also capable of catalyzing a color developing agent, and can be used as a mimic enzyme; the preparation method of nano-nickel oxide is simple in process, high in operability, and capable of further satisfying production and application.

The invention relates to a preparation method of an alkali-earth metal doped MnO2 catalyst capable of efficiently performing catalyzing purification on VOCs through photothermal synergy. The method is characterized by taking low-cost and easily available soluble alkaline-earth metal R (Mg, Ca and Sr) (II) salt, Mn (II) salt and KMnO4 as raw materials and synthesizing the target catalyst through hydrothermal reaction. The method has the advantages of mild reaction condition, simple process, no additives, no high-temperature calcination and no load of noble metals, so that the production cost is greatly reduced. The prepared alkali-earth metal doped MnO2 compound catalyst has high adsorption in ultraviolet, visible and infrared spectra, catalysis activity and stability for efficiently degrading the VOCs through photoinduced thermal catalysis of ultraviolet, visible, infrared and full spectra; the photothermal catalysis activity of the catalyst is far higher than that of commercial TiO2(P25) which is used as a reference photocatalyst; the shortcoming that TiO2(P25) only has ultraviolet catalysis activity is overcome.

The invention belongs to the technical field of organic synthesis, and particularly relates to application of a cyclopalladated ferrocenylimines-phosphine adduct in the synthesis of a cyclopropyl alkyl aromatic compound. Halogenated aromatic hydrocarbon Aryl-X, alkali and cyclopropyl borate which serve as raw materials, and the cyclopalladated ferrocenylimines-phosphine adduct is used as a catalyst. The catalyst has high stability, efficient catalytic activity and wide application range, and a corresponding coupling product can be synthesized in a mode of high yield (which is up to 96 percent) on the premise of small catalytic quantity; and the method is mild in reaction condition, wide in range of substrates and high in specifity of reaction.

The invention belongs to the technical field of nano materials, and particularly relates to a porphyrin-based metal organic framework material for flower-like morphology of a CO2 cyclization catalyticreaction and a preparation method thereof. The method ultrasonically disperses ZrCl4 6H2O, triethylamine, glacial acetic acid, Ni-TCPP and H2O in DMF, conducts magnetic stirring, conducts heating ina stainless steel high-pressure autoclave at 0-200 DEG C for 1-20 hours, and conducts separating and purifying to obtain a flower-like porphyrin MOF catalyst; the catalyst prepared by the above methodexhibits high catalytic activity and high recyclability on the CO2 cyclization reaction.

The invention provides an iron-based catalyst for strengthening ozone oxidation of organic pollutants. The catalyst can efficiently catalyze the organic pollutants which are difficult to degrade by the ozone oxidation under the condition of low ozone concentration to remove difficultly degraded organic substances, and is prepared by taking natural zeolite, artificial zeolite or a zeolite-like material as a carrier loaded with active components, wherein the active components comprise ferrihydrite and delta-hydroxyl oxidize iron in a mass ratio of (20 to 80): (20 to 80); the invention further provides a preparation method of the catalyst and a method for treating wastewater by using the catalyst which can effectively remove antibiotics such as metronidazole difficult to degrade in hospital wastewater; furthermore, the invention improves a disinfection device of existing hospital wastewater, namely a filling layer of the iron-based catalyst is added in an ozone contact pool, thereby not only disinfecting wastewater, but also decomposing the antibiotics in wastewater without changing original operating parameters.

The invention relates to a method for acquiring a novel pullulanase gene and a high-yield strain. The method comprises the following steps: adopting a system for comparing the structure similarity of more than ten pullulanase genes derived from different microorganisms; selecting high-conservative area for performing multi-sequencing combination and designing a long primer; adopting a short-time PCR technique and taking the chromosome DNAs from different microorganisms as templates, thereby acquiring a corresponding suspected pullulanase gene fragment; cloning the gene fragment into a high-expression vector pHY-WZX and performing heterologous expression on the bacillus subtillis; screening a slab by dibbing pullulan with the acquired converter; acquiring the converter with an obvious transparent ring, shaking flask and fermenting and then confirming the strain with the highest enzyme activity. A new process for efficiently fermenting pullulanase on the basis of special starch hydrolysate is established. The efficient preparation for pullulanase in 25L and 30m<3> fermentation system is realized. The highest enzyme activity can reach up to 880U/mL.

The invention discloses a zirconium-based MOF catalyst loaded with double active sites as well as a preparation method and an application of the zirconium-based MOF catalyst. The method comprises thefollowing steps: adding zirconium salt and an organic ligand into an organic solvent, taking organic acid as a regulator, and carrying out self-assembly reaction to obtain a metal organic framework; adding salicylaldehyde for aldehyde amine condensation to obtain chelating coordination sites, adding palladium salt, and performing coordination through an impregnation method; reducing the obtained MOF in hydrogen to obtain an MOF loaded with Pd nanoparticles; reacting MOF and zinc salt in an organic solvent, and obtaining the catalyst. The Pd-Zn-coated UiO-68-NH2-CH3 catalyst synthesized by thepreparation method disclosed by the invention has efficient catalytic activity in a tandem alcohol oxidation/aldehyde cyanosilylation reaction. According to the catalyst, a metal organic framework UiO-68-NH2-CH3 is constructed, Pd nanoparticles and Zn <2+> are loaded by taking the metal organic framework UiO-68-NH2-CH3 as a carrier, the loading capacity of the Pd nanoparticles is 4-8wt%, and the loading capacity of the Zn <2+> is 3-5wt%.

The invention discloses an instrument-free enzyme-linked immunosorbent assay method. According to the method, an antigen-antibody specific immune reaction is carried out in a 96-pore plate so as to capture an analyte antigen or antibody in a sample; nanoparticles are introduced to catalyze a reaction for generating nanogold between chloroauric acid and a reducing agent; a watch or a mobile phone is used for recording the time required for mixed solution to become red, so as to complete instrument-free enzyme-linked immunosorbent assay, wherein the time is negatively correlated to the concentration of a target antigen or antibody in the sample. According to the method, widespread watches or mobile phones are used for carrying out signal reading, so that the cost of quantitative analysis isreduced. Through collaborative use of lipidosome for wrapping plenty of nanoparticles and efficient catalytic activity of the nanoparticles for the reaction of reducing the chloroauric acid by the reducing agent to generate the nanogold, the response signals for the specific binding reaction of single antigen-antibody are amplified, so that the detection sensitivity is improved.

The invention discloses a preparation method of a Fenton catalyst. The preparation method comprises the following steps of a, grinding a precursor (FeCl3.6H2O) into powder; b, adding the precursor powder (FeCl3.6H2O) into a crucible, and sealing; c, placing the sealed crucible loaded with the precursor powder (ferric chloride) into an oven, and calcining; d, naturally cooling the calcined crucible in step c to normal temperature, fetching out the solid which is sintered at the bottom part of the crucible, grinding into powder, cleaning, and drying. The preparation method of the Fenton catalyst has the advantages that the reaction time is short, the conditions are moderate, the amount of raw materials is small, and the large-scale industrialization is easily realized; the prepared catalyst has strong suitability to pH (potential of hydrogen) value in the Fenton reaction process, and still has higher catalyzing activity under the condition of neutral pH value.

The invention belongs to the technical field of organic synthesis, and in particular relates to an application of a cyclopalladated ferrocenylimine-phosphine adduct in synthesis of an asymmetric biaryl compound. In synthesis of the asymmetric biaryl compound, the cyclopalladated ferrocenylimine-phosphine adduct is utilized as a catalyst, and the catalyst has the advantages of good stability, efficient catalytic activity and wide applicability; and by utilizing the catalyst, a corresponding coupling product with high yield (up to 95%) can be obtained on the premise of smaller catalytic amount, and the synthesis process has the characteristics of mild reaction conditions, wide substrate range and strong reaction specificity.

The invention relates to a nitrogen heterocyclic carbene silver complex based on bispyrazole methyl phenoxy methylimidazole and a preparation method and application thereof. The preparation method of the nitrogen heterocyclic carbene silver complex is as follows: at room temperature in dark conditions, a bispyrazole methyl phenoxy methyl substituted imidazolium salt and silver oxide in the molar ratio of 1 to 0.7 are dissolved in an organic solvent for reaction for 24 hours, then filtered and concentrated to prepare the nitrogen heterocyclic carbene silver complex. The nitrogen heterocyclic carbene silver complex has strong capability of emission fluorescence and catalyzing of coupled reaction of acetylene, amine and aldehyde three components, and can be mainly used in fluorescent materials and organic catalysis technology field.

The invention discloses an application of cubic boron nitride as mimetic peroxidase. Specifically, cubic boron nitride is taken as mimetic peroxidase to measure the hydrogen peroxide concentration. Cubic boron nitride simulates peroxidase, the particle size of cubic boron nitride is not limited, and cubic boron nitride particles all have mimetic peroxidase activity. At first, people find that cubic boron nitride can simulate peroxidase; the enzyme catalytic activity of cubic boron nitride is as good as that of horse radish peroxidase (HRP); and cubic boron nitride can be used to measure the content of hydrogen peroxide in a solution sample. Compared with natural enzymes, cubic boron nitride (simulated enzyme) is more stable in extreme environments such as strong acid, strong alkali, high temperature, and the like, moreover, cubic boron nitride can be repeatedly used, and the catalytic activity is maintained in a high level. The preparation technology is simple, the repeatability and stability are high, and the cost is low. Cubic boron nitride is used as a novel mimetic peroxidase, and can replace peroxidase in fields such as immunoassay, biological detection, clinical diagnosis, pollutant degradation, and the like.

The invention discloses a multi-stage structure electrode for electrolyzing water, and a preparation method of the multi-stage structure electrode. The preparation method comprises the following steps: carrying out electrochemical etching to obtain a primary-structure rough nickel net, depositing iron-based bimetal and alloy thereof on the surface of the rough nickel net according to different application purposes, and carrying out electrochemical oxidation in an alkaline electrolyte to form an iron-based bimetallic oxyhydroxide on the surface to obtain a tertiary structure. According to the method, the roughness of the surface of the nickel net is increased, anchoring sites are increased, and through the synergistic effect between the multi-stage structures, efficient catalytic activity is achieved while lasting durability is kept, and the performance is better than that of a loaded single-stage structure or a loaded double-stage structure; when the decomposition voltage reaches 2.0 V, the maximum current density can reach 10000 A/m<2> or above; the stability test after activation is that the performance remains basically unchanged after continuous hydrogen production for more than 100 hours at the current density of 6000 A/m<2>, and the electrode material prepared by the method shows excellent catalytic activity and stability, and is very suitable for industrial application of an electrolytic bath for electrolyzing water.

The invention discloses a preparation method and application of a modified active carbon fiber based on 8-hydroxyquinoline ferrum. The preparation method of the supported active carbon fiber comprises the following steps of: (1) respectively dissolving ferric salt and 8-hydroxyquinoline compounds into an organic solvent, and mixing the ferric salt and the 8-hydroxyquinoline compounds according to a certain proportion to prepare a quinoline ferrum complex solution; (2) supporting a quinoline ferrum complex on an active carbon fiber by using an adsorption method or covalent bond grafting method; and (3) finally, taking out the active carbon fiber, washing the surface of the active carbon fiber by using water, and placing the active carbon fiber into a drying oven to dry to obtain the modified active carbon fiber. The modified active carbon fiber is simple in preparation, lower in requirement for reaction environments, capable of efficiently treating printing and dyeing wastewater through catalyzing hydrogen peroxide under the condition that the pH is 2-11, being repeatedly used many times and making up the defects of secondary pollution, narrow pH application range and the like of the traditional Fenton, and higher in implementation value and socioeconomic benefit.

The invention relates to a preparation method of mesoporous nitrogen-doped graphene-loaded molybdenum disulfide synthesized by laser irradiation and application of the mesoporous nitrogen-doped graphene-loaded molybdenum disulfide in electrocatalytic hydrogen production. In order to solve the problems that by an existing synthesis process, transition metal oxide/sulfide composite mesoporous nitrogen-doped graphene rich in carbon-pyridine nitrogen metal bonds cannot be synthesized at low temperature and under low pressure, and the content of the carbon-pyridine nitrogen metal bonds in the composite system cannot be regulated and controlled effectively, it is found that the content of the carbon-pyridine nitrogen-molybdenum bonds in the composite catalyst can be improved by irradiating graphene oxide with laser in a range of 177-315 mJ, and in a hydrothermal process, the mass ratio of laser irradiation graphene oxide to tetrathiomolybdic acid as raw materials is 1: 1-1: 8, the loading amount of the molybdenum disulfide on mesoporous graphene can be optimized, thus, while the conductivity of the molybdenum disulfide is improved, the intrinsic activity of the molybdenum disulfide can also be improved synergistically by the carbon-pyridine nitrogen molybdenum bonds at an interface, and the electrocatalysis process of HER is promoted. The preparation method is simple in process, ingenious in design and low in cost, and is safe and environmentally friendly.

The invention relates to a preparation method and applications of Ni-doped FeOOH/NF synthesized by using a millisecond laser direct writing technology. According to the invention, foamed nickel in aniron salt solution is irradiated by using a millisecond laser to prepare Ni-doped FeOOH with a three-dimensional structure; the application of the Ni-doped FeOOH/NF in an oxygen evolution reaction isthat the catalytic performance of an oxygen evolution reaction (OER) is improved by utilizing the high activity sites caused by rich defect sites and edge nickel doping and good conductivity of the Ni-doped FeOOH; and the synthesis method is simple in process, convenient to operate and easy to control, does not use toxic reaction raw materials, and is an environment-friendly synthesis process.