167results about How to "Improve catalytic degradation efficiency" patented technology

The invention relates to a nano particle taking Fe3O4 as core, in particular to a TiO2/SiO2/Fe3O4 nano particle with nuclear structure and manufacturing method thereof. The invention solves the technical problems that nano TiO2 particle catalyst has low catalytic efficiency under natural light and is difficult to meet recovery control while remaining high catalyst activity in sewage treatment. The method includes steps of preparing SiO2/Fe3O4 solution, preparing titanium sol and mixing the prepared SiO2/Fe3O4 solution and the titanium sol. The invention adopts ferromagnetic particle as a carrier core and prepared TiO2/SiO2/Fe3O4 particle with nuclear shell structure as catalyst, and the catalyst particle has good dispersity and water-solubility and can be fully contacted with organic pollutant in sewage, thereby not only having high efficiency of suspended phase photocatalyst but also realizing magnetic control of catalyst by super paramagnetic nuclear energy, thus being effectively recovered.

The invention discloses a preparation method of a noble metal-loaded activated carbon fiber monoatomic catalyst for catalytic degradation of VOCs at room temperature. The method includes the steps of:(a) pretreatment of a carrier: immersing activated carbon fiber in a sulfuric acid solution, performing ultrasonic treatment, then subjecting the ultrasound treated solution to heating reaction in awater bath pot, then performing cleaning with distilled water to neutral, and conducting natural airing to obtain modified activated carbon fiber; (b) noble metal loading: impregnating the modified activated carbon fiber in a noble metal solution, and performing ultrasonic treatment and standing, then adding a sodium hydride solution to reduce noble metal, finally taking out the activated carbon fiber, and conducting washing and drying to obtain a noble metal-loaded activated carbon fiber semi-finished product; and (c) calcination: putting the noble metal-loaded activated carbon fiber semi-finished product in a muffle furnace for calcination, thus obtaining the noble metal-loaded activated carbon fiber monoatomic catalyst finally. The method provided by the invention greatly improves the catalytic degradation efficiency of the monoatomic catalyst.

The invention relates to a preparing method for an oriented-zinc-oxide-nanometer-bar-loaded fiber membrane. The preparing method includes the following steps that a high-molecular polymer and zinc acetate are dissolved in an organic solvent, magnetic nanometer particles are added into the mixture, the mixture is fixed to be even, and then an electrostatic spinning solution is obtained; an ordered high-molecular polymer/zinc acetate/magnetic nanometer particle fiber is prepared with a magnetic-field-assisting electrostatic spinning technology; zinc salt, hexamethylene tetramine and ammonium hydroxide are mixed to be even in water, and a growth solution is obtained; the high-molecular polymer/zinc acetate/magnetic nanometer particle fiber is subjected to low-temperature heat treatment, the zinc acetate is converted into zinc oxide, then the zinc oxide is put into the growth solution, and the oriented-zinc-oxide-nanometer-bar-loaded fiber membrane is obtained after a reaction with the hydrothermal method. According to the preparing method, the reaction condition is wild, operation is easy, and the controllability is high; the product prepared with the method is not limited by application in the inorganic substance aspect, the photoelectric performance is excellent, and the catalytic degradation efficiency is improved.

The invention relates to the technical field of nano photocatalysis, particularly to Bi2WO6 modified TiO2 nanobelt photocatalyst, a preparation method and application thereof. The Bi2WO6 modified TiO2 nanobelt photocatalyst takes the shape of an anatase type nanobelt and is 4.8-5.2 mum in length and 380-420 nm in width. The preparation method of the photocatalyst mainly includes the steps of titanium sheet pretreatment, TiO2 nanobelt forming through the sodium hydroxide solution corrosion method, preparation of Bi2WO6 modified TiO2 nanobelt through the hydrothermal synthesis method and forming of Bi2WO6 modified TiO2 nanobelt photocatalyst through calcination. The prepared Bi2WO6 modified TiO2 nanobelt photocatalyst provided by the invention takes the shape of the anatase type nanobelt, has smaller forbidden bandwidth and larger specific surface area, thereby having the photocatalytic activity for organic substance degradation 25% above higher than that of a pure TiO2 nanobelt, and has excellent cycling stability, can be repeatedly used, and avoids secondary pollution during the photocatalytic degradation.

The invention relates to a preparation method and application of a CO<2+>-doped titanium dioxide self-cleaning film. The preparation method comprises the following steps: uniformly mixing dibutyl phthalate with absolute ethyl alcohol, and adding diethanol amine to prepare a transparent solution A; uniformly mixing deionized water, acetylacetone and absolute ethyl alcohol, so as to prepare a transparent solution B; adding cobalt acetate tetrahydrate into the obtained mixed solution, regulating the pH value of the mixed solution to 2.0-5.0, mixing to form uniform sol, and ageing to obtain gel C; soaking a cleaned substrate into the gel C, standing still and repeatedly lifting and coating till obtaining the film with the required thickness, and then sequentially drying and annealing, so as to obtain the CO<2+>-doped titanium dioxide self-cleaning film. The preparation method has the advantages that process devices are simple, the cost is low, the film-forming property and the repetitiveness are good, and the capacity of the prepared film for catalyzing the degradation of methyl orange under the sunlight radiation is obviously higher than that of a titanium dioxide film.

The invention discloses a Fe3O4 @rGO@MIL-100 (Fe) photo-Fenton catalyst and preparation and application thereof. The photo-Fenton catalyst is formed by coating ferroferric oxide, partially-reduced graphene oxide and MIL-100 (Fe) layer by layer. A preparation method of the photo-Fenton catalyst comprises: firstly, preparing ferroferric oxide; then modifying the surface of the ferroferric oxide by 3-aminopropyltriethoxysilane; sequentially coating the graphene oxide and the MIL-100 (Fe); finally, carrying out vacuum high-temperature drying reduction to prepare the photo-Fenton catalyst. The catalyst is applied to photo-Fenton degradation on chlorphenol polluted wastewater, and has an excellent degradation effect; not only is a pH range of a Fenton reaction expanded, and a use amount of a H2O2 reagent is reduced, but also degradation efficiency of the Fenton reaction on the chlorphenol wastewater is greatly improved in the aspect of dynamics, and treatment cost of the chlorphenol wastewater is greatly reduced; the photocatalytic-Fenton catalyst is low in cost and environmental friendly, and has industrialized application prospect.

An ultrasonic-chemical process for preparing the high-activity nano-crystal visual-light photcatalyst BiVO4 for fast degradating organic pollutant is prepared through dissolving the Bi ion contained nitrate (or chloride or oxalate) in distilled water, proportionally adding the V ion contained meta-vanadate, stirring to become yellow suspension, ultrasonic treating to obtain yellow deposit, filtering, washing and drying.

The invention provides a preparation method of a visible light and ozone cooperating catalyst for catalytically degrading organic acid. The preparation method comprises the following steps that 1, manganese acetate is weighed and dissolved in ultrapure water, melamine is added after stirring, and a mixed solution is obtained; 2, the mixed solution is heated while being stirred till water is evaporated to be dry, a mixture is obtained, the mixture is dried, and the dried mixture is obtained; 3, the dried mixture obtained in the step 2 is ground and then calcined, and the calcined mixture is obtained; 4, the calcined mixture obtained in the step 3 is ground and screened, and then the catalyst is obtained. The catalyst is added into the organic acid, ozone is introduced, the organic acid in industrial waste water is catalytically degraded under the condition of visible light illumination, the catalytic degradation efficiency is high, the organic acid in the industrial waste water is effectively treated, and the preparation method is suitable for industrial application.

The invention discloses preparation and application of a graphene composite fiber nonwoven fabric for catalytically degrading neuropathic chemical warfare agents, and belongs to the field of chemicalprevention. MOFs (Metal Organic Frameworks) nanoparticles are synthesized on the surface of fibers by a solvothermal method by using graphene fibers as carriers, wherein the diameter of the graphene fibers is 20 to 100 [mu]m; an MOFs catalyst is UiO-66-NH2; the particle dimension is 50 to 400 nm; and the composite fiber nonwoven fabric is graphene@UiO-66-NH2, and the thickness is 50 to 300 [mu]m.The graphene composite fiber nonwoven fabric is prepared through wet spinning and subsequent vacuum suction filtration, and has an efficient photothermal conversion effect. Under the condition of simulated sunlight, the catalytic degradation half-life period of the graphene@UiO-66-NH2 on an optimum analog of methyl paraoxon of a nerve poison of GD is 1.6 min; complete degradation can be almost realized within 20 min; and excellent capability of fast and catalytically degrading the neuropathic chemical warfare agents is shown.

The invention discloses an organic wastewater catalytic degradation and separation device and method. The device comprises a dilution mechanism, a catalytic degradation and separation mechanism, a first control module and a second control module. The diluting mechanism comprises a diluting box, a stirring mechanism and a stirring driving mechanism. The catalytic degradation separation mechanism comprises a base bracket, a separation chamber, a catalytic mechanism and an aeration mechanism. The separation chamber comprises an upper separation chamber and a middle catalytic degradation chamber and a recovery chamber, wherein a titanium dioxide particle catalyst is arranged in the recovery chamber, and a separation mechanism is arranged in the upper separation chamber. The method comprises the following steps: 1, diluting organic wastewater; 2, conveying the diluted organic wastewater; 3, adding a titanium dioxide particle catalyst; and 4, carrying out catalytic degradation and separationon the diluted organic wastewater. According to the invention, dilution of organic wastewater is realized, catalytic degradation is carried out on the diluted organic wastewater, the catalytic degradation efficiency is improved, and the titanium dioxide particle catalyst can be separated and recovered.

The invention relates to a preparation method of a compound ecological fertilizer from plant stalks. The compound fertilizer is prepared by degrading a main raw material of plant stalks under the action of small molecule organic acid in the presence of a solid super acid catalyst, and combining with distiller's grains, bone meal, bran leather, humic acid, and NPK fertilizer. The raw materials consist of, by weight, 60-80 parts of plant stalks, 5-10 parts of distiller's grains, 5-15 parts of bone meal, 5-15 parts of wheat bran, 5-10 parts of humic acid and 30-50 parts of NPK fertilizer. The method uses a catalytic degradation technology for preparation of the compound ecological fertilizer, reaches high catalytic degradation efficiency of stalks, completes the conversion from stalks to compound ecological fertilizer within 16h at the highest speed, and has the advantages of simple operation, low cost, recyclable catalyst, and no corrosion of equipment, and can quickly obtain the product. The prepared compound ecological fertilizer can effectively enhance fertilizer efficiency, stimulate crop growth, control pests and diseases, improve the quality of agricultural products, and the absorb soil pollutants, improve the water retention capacity of soil and fertilizer and improve soil structure, and is conducive to the sustainable development of agriculture.

The invention provides a preparation method of an antibacterial and fresh-keeping composite packaging film and relates to a preparation method of a composite packaging film. The composite packaging film provided by the invention is used for solving the problems that the existing antibacterial packaging film is low in nano TiO2 photocatalysis efficiency and inapparent in antibacterial and fresh-keeping effect. The preparation method of the antibacterial and fresh-keeping composite packaging film comprises the following steps of: firstly, dissolving chitosan; secondly, modifying a nano material by adopting powder; thirdly, adding the nano material; fourthly, adding metal ions, thus the preparation method of the composite packaging film with a fresh-keeping function is completed. The preparation method is simple and practicable, Ag exists in an ion form, a uniform film can be easily prepared, and the prepared film is degradable, good in fresh-keeping function and low in cost. The preparation method of the antibacterial and fresh-keeping composite packaging film is applied to the field of antibacterial packaging.

The invention discloses a BiOCOOH/g-C3N4 composite photocatalyst and a preparation method and application thereof and relates to the technical field of photocatalysis. In the BiOCOOH/g-C3N4 compositephotocatalyst, the BiOCOOH is inlaid in the lamellar structure of the g-C3N4; and the molar ratio of the BiOCOOH to the g-C3N4 is (0.15-4.75):1. The composite photocatalyst has stronger visible lightresponse capability, higher photo-induced electron-hole pair separation efficiency, high catalytic activity and high efficiency of visible light catalytic degradation of organic dye-containing wastewater. The preparation method comprises the following steps of synthesizing the composite photocatalyst from the g-C3N4, soluble bismuth salt and a solvent through a hydrothermal method, wherein the molar ratio of the soluble bismuth salt to the g-C3N4 is (0.15-4.75):1. The preparation method has the advantages that the raw materials are cheap and easy to obtain, the process is simple, the operationis simple and convenient, and secondary pollution is avoided.

The invention provides a catalytic purification composite material and a preparation method and application thereof. Activated carbon loaded manganese sand particles are used as a basic framework of the material, and mixed metal oxides as active components are loaded on the outermost layer of the framework. The preparation method of the material comprises the following steps: pretreating manganese sand and removing impurities on the surface of the manganese sand; taking wooden activated carbon or shell activated carbon as an activated carbon precursor; roasting in an inert atmosphere; preparing a porous carbon structure which uses the manganese sand as a framework; and modifying the surface of the manganese sand-porous carbon structure by using the metal oxides to form the novel composite purification material with adsorption and electro-catalyst composite functions. When the catalytic purification composite material is used, the composite material effectively adsorbs and catches low-concentration organic matters in micro-polluted raw water at first, so that pollutants are adsorbed on the surface of the material, then the composite material with adsorption saturation is guided into an electrolytic bath for electrochemical oxidation, the pollutants on the surface of the composite material are desorbed and decomposed, and are thoroughly mineralized into carbon dioxide and water, and meanwhile, recycling of the composite material is realized.