36results about How to "Stable and reusable" patented technology

The invention discloses a preparation method of a metal-base ceramic composite filter membrane. The method includes steps: firstly, uniformly coating powder on the surface of a porous matrix, and obtaining a porous metal membrane layer by means of sintering; secondly, soaking the porous metal membrane layer into electrolyte to be anodized and obtaining a transition layer; thirdly, adding oxide powder into dispersing agent to obtain coating liquid; fourthly, coating the coating liquid onto the transition layer and sintering the transition layer after the transition layer is dried; and fifthly,repeating the fourth step for a product after being sintered until a porous ceramic filtering membrane with the thickness ranging from 2mum to 80mum is obtained, and obtaining the metal-base ceramic composite filtering membrane. The problem that bonding is not firm enough when metal and ceramic are compounded is resolved, the effective transition layer is formed on the metal matrix, so that a ceramic layer is firmly bonded with the metal matrix, processability of the prepared composite filter membrane is good, and the composite filter membrane can be used for preparing filtering devices in various shapes, simultaneously, has excellent chemical attack resistance, is high in pressure resistance and stable in repeatability, and can be used as a key component for micro-nano filtering and separating.

The invention provides a preparation method and application of a rod-like ozone catalyst Cu-OMS-2. The preparation method includes: providing a first solution, wherein the first solution comprises a Mn<2+> solution [such as manganese acetate (Mn(CH3COO)2), manganese chloride (MnCl2 4H2O), manganese nitrate (Mn(NO3)2) and manganese sulfate MnSO4 H2O], copper chloride dihydrate (CuCl2 2H2O) and a dispersing agent; providing a second solution, wherein the second solution comprises a second solvent and potassium permanganate (KMnO4) powder evenly dispersed in the second solvent; dropwise adding the second solution into the first solution, and stirring and performing ultrasonic treatment to obtain a mixture; placing the mixture into a high-temperature reaction kettle to perform reaction, centrifuging, drying, grinding, and calcining at high temperature to obtain the Cu-OMS02 ozone compound catalyst. Cu<2+> is doped into an OMS-2 crystal structure and then used for ozone catalysis, metal iondissolution after traditional metal catalyst reaction is lowered effectively, and catalyst activity and stability are increased.

The invention provides a titanium modified Fe3O4 magnetic nano-particle, a preparation method and the application thereof. The preparation method specifically comprises the following steps: in a eutecticevaporate solvent of choline chloride and urea, taking ferrite as an iron source, tetrabutyl titanate as a titanium source and air as an oxidizing agent, and using a precipitation oxidization process to synthesize the titanium modified Fe3O4 magnetic nano-particle in one step. According to the preparation method provided by the invention, the obtained material has excellent catalytic degradation capacity (for example, under the conditions of room temperature and neutral pH, the color removal rate for a 0.01 mmol/L methylene blue solution within 2h reaching 93.8%, and the removal rate for a20 mg/L Ciprofloxacin solution reaching 96.5%) for organic waste water, is easy for magnetic separation recycle and stable in reuse performance, and is a novel magnetic environmentally-friendly material with low cost, quick and convenient operation, obvious effect and wide application prospect.

The invention discloses an organic heteropoly hybrid catalyst for an esterification reaction. The organic components comprise polyvinyl pyrrolidone, methyl-pyrrolidone and caprolactam. The heteropoly acid is 12-phosphotungstic acid, 12-phosphomolybdic acid and 12-silicotungstic acid. The preparation method comprises the step that the organic components and the heteropoly acids are subjected to protonation to obtain the organic heteropoly hybrid catalyst. The invention has the advantages that the preparation process of the catalyst is simple and practicable; and the obtained catalyst is suitable for the esterification reaction of many kinds of carboxylic acids and alcohol, and has the characteristics of high catalytic activity and selectivity, convenient recycling, and stable reutilization performance, thereby being an environment-friendly novel solid acid catalyst.

The invention provides a preparation method and application of an oxygen-doped graphite-phase carbon nitride ozone catalyst. The preparation method comprises the following steps that a first solution is prepared, wherein the first solution contains g-C3N4 powder and H2O2 which are mixed evenly and is ultrasonically stirred to obtain a substance about to react; hydrothermal synthesis reaction is conducted on the substance about to react to obtain a mixture; the mixture is cooled, H2O2 residues are removed, and then drying and grinding are performed to obtain the oxygen-doped graphite-phase carbon nitride ozone catalyst. Inorganic carbon and nitrogen materials are used for ozone catalysis process, and the problem that after reaction of traditional metal catalysts, part of metal ions is dissolved and accordingly catalyst activity reduction, further environmental pollution and the like are caused is solved.

The method discloses a method for selectively adsorbing and separating acetophenone and alpha-methyl benzyl alcohol. Based on the characteristics of the difference of the adsorption capacity of beta-cyclodextrin to the acetophenone and the alpha-methyl benzyl alcohol, the insolubility of the beta-cyclodextrin in a mixing solution of the acetophenone and the alpha-methyl benzyl alcohol and the like, the purpose of separation and purification is realized by performing preferential adsorption on the acetophenone under an moderate condition by taking the beta-cyclodextrin as an adsorbent. The method is moderate in separation condition, good in separation effect, simple in process, energy-saving, environmental-friendly and the like; and the adsorbent can be used repeatedly.

The invention belongs to the technical field of wastewater treatment, and relates to a modified silicone rubber composition, a textile fabric and application thereof. The modified silicone rubber composition comprises silicone rubber and an anthraquinone-containing fluorosilicone compound, the weight ratio of the silicone rubber to the anthraquinone-containing fluorosilicone compound is 100: 0.05-3, and the anthraquinone-containing fluorosilicone compound is obtained by a reaction between an anthraquinone compound and a fluorosilicone polymer. The textile fabric prepared from the modified silicone rubber composition has a good effect of promoting the microbial degradation of azo dyes and nitrates.

The invention discloses a method for manufacturing a foam stainless steel composite tube. The method includes the first step of preparing a dispersant, the second step of preparing stainless steel powder slurry, the third step of evenly coating the stainless steel powder slurry on the outer surface of a stainless steel tube, carrying out heat treatment after drying and obtaining a stainless steel powder sintered porous layer, the fourth step of covering the surface of the stainless steel powder sintered porous layer with a foam formwork, evenly applying the stainless steel powder slurry to the foam formwork, carrying out heat treatment after drying and obtaining a stainless steel foam layer, namely obtaining the foam stainless steel composite tube. According to the method, raw materials are wide in source range and easy to obtain, the manufacturing process is simple, the heat conductivity coefficient of the obtained foam stainless steel composite tube is reduced by more than 10 times compared with that of a stainless steel bare tube, critical heat flux density is improved more than twice, the specific area is large, and the foam stainless steel composite tube has the advantages of being good in machining performance, little in raw material consumption, large in heat exchange specific area and stable in repetitive use performance and can serve as a key part of a radiator.

The invention provides an application of a Ca-based solid base heterogeneous catalyst in preparation of dimethyl carbonate. The Ca-based solid base heterogeneous catalyst is a Ca3Co4O9 catalyst and is used in a reaction for preparing dimethyl carbonate through transesterification of cyclic carbonate and methanol. The Ca-based solid alkali heterogeneous catalyst Ca3Co4O9 has the advantages of high temperature resistance, oxidation resistance, good thermal stability, high chemical stability and the like, loss of Ca active components can be effectively inhibited, high dimethyl carbonate yield is realized under normal-pressure and low-temperature reaction conditions, and in addition, the catalyst is simple in preparation method, stable in repeated use performance and suitable for industrial production. The industrial amplification is facilitated.

The present invention relates to a process for synthesizing p-aminophenol through nitrobenzene hydrogenation. The process comprises: adding water, concentrated sulfuric acid, zinc sulfate, nitrobenzene and a surfactant hexadecyl trimethyl ammonium bromide to a reactor provided with an active reaction member according to a mass ratio of concentrated sulfuric acid to zinc sulfate to nitrobenzene to hexadecyl trimethyl ammonium bromide to water of 0-20:0-2:2-20:0.01:100; and adopting N2 to replace air for 8-12 min, heating to a reaction temperature of 80-200 DEG C, introducing H2 to achieve a hydrogen partial pressure of 0.1-2.0 MPa, and carrying out a reaction for 3-8 h to make the nitrobenzene convert into the p-aminophenol. According to the present invention, the active reaction member is adopted to synthesize the p-aminophenol through nitrobenzene hydrogenation, wherein the highest p-aminophenol yield is 83.7%, the repeated use performance is stable, the reaction result does not significantly change after repeating the reaction more than 50 times, and the catalyst loss and regeneration problems are not produced during the reaction process.

The invention discloses a method for separating rare earth elements. The method comprises the following steps: (1) preparation of mixed resin, (2) column packing, (3) column separation, (4) column washing and (5) column cycling. The method has the advantages that the rare earth elements are separated by adopting an ion-exchange resin method, thus solving the problem of environmental pollution caused by saponification; the problem of low rare earth adsorption quantity caused by low extraction equilibrium acidity of rare earth ions is solved by applying the H<+1> adsorption capacity of N235 resin; the exchange acidity of an adsorption zone can be controlled by utilizing the acid absorption capacity of N235, so that resin has better light rare earth separating capacity; separation of the rare earth elements by adopting a fractional extraction-elution process is achieved by utilizing a mode of connecting a plurality of columns in series and a new method is provided for separation of the rare earth elements.

The invention discloses an emergency treatment apparatus applicable to catalytic oxidation of high-risk wastewater. The emergency treatment apparatus comprises a base plate, an oxidizing agent storage zone, a mixer, a catalytic converter, a pressure water pump and a three-way valve, wherein the oxidizing agent storage zone, the mixer, the catalytic converter and the pressure water pump are all fixedly mounted on the base plate; the wastewater inlet pipe of the apparatus is connected with the water inlet of the three-way valve via the pressure water pump; the other water inlet of the three-way valve is connected with the oxidizing agent storage zone; the water outlet of the three-way valve is connected with the mixer; the mixer is connected with the water inlet of the catalytic converter; and the catalytic converter is provided with a water outlet which is connected with a wastewater outlet pipe. The apparatus provided by the invention treats wastewater by using the principles of cooperation between photocatalysis and chemical catalysis and can realize diversified treatment of a plurality of components in sewage; process conditions of oxidation and degradation are mild; heating is not needed; the range of the acid-base value of sewage is wide; no secondary pollution is produced; and a catalyst is shaped and can be repeatedly and stably used.

The present invention discloses a pencil-like optical fiber sensor probe, including an inner tube, a light screening casing, a clamping device, an optical fiber and an optical probe; a portable immunosensor, including the pencil-like optical fiber sensor probe, an immersion immune response reagent strip, a touch-screen computer, a compact battery-powered sensitive photon counting detector and a case; and a use of the immunosens in detecting inflammatory markers. The design of the pencil-like optical sensor probe greatly simplifies the immune analysis process by combining the immersion immune response reagent strip. Each optical probe allows for up to 10 immunoassays, which reduces the experimental cost and avoids frequent replacement of the probe. The integrated detecting system is powered by battery which is suitable for in-situ analysis and detection. The sensor also has a high stability and sensitivity.