129results about How to "Efficient catalytic degradation" patented technology

The invention discloses a zero-valent iron carrying nanometer composite resin for catalytic degradation of pollutants and a preparation method thereof. The zero-valent iron nanometer composite resin has the following structures: (1) the carrier of the nanometer composite resin is an ion-exchange and adsorption resin having alkali functional group; (2) the internal and external surfaces of the carrier support nanometer sized zero-valent iron series inorganic materials. The zero-valent iron nanometer composite resin is prepared by leading FeCl4 ion onto the internal and external surfaces of the resin by ion-exchange, deoxidizing the FeCl4 ion into nanometer zero-valent iron and obtaining the zero-valent iron carrying nanometer composite resin by washing and drying under the protection of N2. The composite resin integrates the Donnan preenrichment effect of the resin on the inorganic anionic pollutants in the water body and the high-efficient catalytic degradation effect of the nanometer zero-valent iron on the environmental pollutants, overcomes the shortcomings of easy conglobation, unstable chemical property, small particles and big loss of the pressure head of the nanometer zero-valent iron particles and has fast, high-efficient and low-cost catalytic degradation toward the micro-pollutants in the environment.

The invention discloses a magnetically supported titanium dioxide photocatalyst and a preparation method thereof, belonging to the technical field of material preparation. A solvothermal process is used for obtaining a dimension-adjustable ferroferric oxide spherical particles, and the pH value, reaction temperature, reaction time and other experimental parameters are regulated to control the hydrolysis of tetrabutyl titanate, so that the tetrabutyl titanate is uniformly supported on the surface of the ferroferric oxide magnetic nucleus, thereby preparing the hexagonal crystal form magnetically supported titanium dioxide photocatalyst. The magnetically supported titanium dioxide photocatalyst has the advantages of controllable preparation technique, high safety and reliability and high yield, can be used for quickly catalyzing the degradation of pollutants, and can be easy in industrialization production.

The invention provides a photocatalytic functional fabric and a preparation method thereof. The preparation method comprises the following steps: firstly treating zeolite imidazole skeleton material (ZIF-8) onto a fabric, then loading bismuth vanadate (BiVO4) onto the fabric treated by the ZIF-8 by adopting an in-situ growth method, and preparing the photocatalytic functional fabric. The functional fabric can efficiently and catalytically degrade organic pollutants under the radiation of visible light and can be used for treating the printing and dyeing waste water and purifying the air. The preparation method is simple in preparation process. The prepared photocatalytic functional fabric has the advantages of good adsorption performance, high catalytic efficiency, good stability, reusability and the like. The photocatalytic degradation rate for active black KN-B can reach 85 percent or above, and the photocatalytic degradation rate for the active black KN-B after being reused for three times can be still kept at 65 percent or higher. The degradation rate for formaldehyde in the air can reach 87 percent or above.

The invention discloses a low-VOC glass fiber reinforced polypropylene halogen-free flame-retardant composite and application. The composite is prepared from, by weight, 35-75 parts of polypropylene, 4.5-6 parts of hollow glass micro-beads, 15-45 parts of glass fiber, 0-4 parts of talcum powder, 0.2-0.5 part of antioxidant, 0.3-0.5 part of ultraviolet stabilizer and absorber, 1-3 parts of compatilizer, 0.8-1.5 parts of halogen-free phosphorus based flame retardant, 0.2-0.5 part of flame retardant synergist and 3-4 parts of VOC inhibitor. The composite can efficiently catalyze and degrade VOC in a vehicle in an energy-saving and environment-friendly mode without the aid of external ultraviolet sources or devices; meanwhile, the hollow glass micro-beads of which the surfaces are coated with the compatilizer are added, on the premise of not reducing the strength of the composite, the compatibility of the composite and glass fiber reinforced PP is high, and the density can be effectively reduced; by adding a small amount of flame retardant, the flame retardance of the composite is improved; the low-VOC glass fiber reinforced polypropylene halogen-free flame-retardant composite can be applied in vehicles and household appliances.

The invention relates to an activated carbon fiber loading titanium dioxide composite photocatalytic material and a preparation method and application thereof, According to the method, by ultrasonic aided sol-gel method, titanium dioxide sol formed by the hydrolysis of a titanium-containing compound is loaded onto the surface of activated carbon fiber, and after drying, the titanium dioxide/carbon fiber composite photocatalytic material is obtained by heat treatment system in a protective gas. The ultrasonic aided sol-gel method is simple in process, and can be used in industrial production, the titanium dioxide is loaded evenly and firmly onto the surface of the activated carbon fiber, and the less amount of the titanium dioxide is deposited among activated carbon fiber gaps. The activated carbon fiber loading titanium dioxide composite photocatalytic material has good photocatalytic performance and repeated use property, and can be applied to air purification field.

The invention discloses a Bi2WO6 nano-composite fiber visible photocatalyst and preparation method thereof, and the Bi2WO6 nano-composite fiber visible photocatalyst comprises an adsorption zone (carbon nanofiber) and a visible photocatalytic activity zone (nano Bi2WO6). The invention has the characteristics of low energy band, high quantum efficiency, large specific surface area, high stability, easy recovery, environment protection, etc., and can catalyze and degrade methylene blue with high efficiency. The degradation rate with xenon lamp irradiation for 2.5 h reaches to 95.17%; the preparation method comprises the following steps: designing and synthesizing polymer p (AN-g-PEO) which is coordinated with bismuth ions, and preparing the modified carbon nanofiber visible light catalyst. In the preparation process, the reaction condition of ultrasonic vibration for dispersion is mild, and the invention has the advantages of easy operation, excellent dispersion effect and stable dispersion.

The invention discloses a preparation method of a porous nano-optical fiber heterostructure photocatalysis filter net. The preparation method comprises the following steps: preparing a spectrum-adjustable noble metal nano-structure and photocatalysis material heterostructure composite photocatalyst; and preparing a large-area and multilayer nano-optical fiber filter net structure, realizing the repeated conduction of sunlight in porous optical fibers by virtue of a scattering enhancement effect of metal nanoparticles in the porous optical fibers so as to realize interaction with the compositephotocatalyst on the surface, so that the photocatalytic efficiency is increased. According to the preparation method, an adjustable heterostructure composite photocatalyst with wide spectral responsefrom a visible light waveband to an infrared waveband is prepared, and meanwhile, an air purification filter net with high sunlight utilization rate and efficient catalytic degradation capacity is creatively disclosed by combining with the high absorbability and light translucency of the nano-optical fibers and the specific optical properties of the metal nanoparticles, so that the problems thata traditional air purification filter net is low in photocatalytic efficiency, short in service life, high in cost and the like are solved.

The invention relates to a method for preparing a semiconductor oxide catalyst which can degrade gas-phase volatile organic compounds. The method for preparing the semiconductor oxide catalyst with a synergistic effect of light and heat is characterized by comprising the following steps of: 1) selecting a semiconductor oxide and a solvent in a certain proportion of 0.1 to 1g: 10 to 40 ml, adding the semiconductor oxide into the solvent, and uniformly mixing the semiconductor oxide with the solvent to obtain a suspension of the semiconductor oxide; 2) placing a beaker which contains the suspension of the semiconductor oxide in an ultrasonic device, and performing ultrasonic treatment on the suspension for 1 to 2 hours; 3) coating the suspension on the surface of an ultraviolet lamp under the illumination of an infrared lamp; and 4) drying the surface of the ultraviolet light under the infrared lamp to obtain the semiconductor oxide catalyst with the synergistic effect of light and heat. The preparation method has the advantages of easily obtained raw materials, simple process and easy industrialization; and the semiconductor oxide catalyst prepared by the method can effectively degrade gas-phase volatile organic pollutants such as benzene, methyl benzene, methyl aldehyde, methyl alcohol, acetone and the like, and has excellent catalytic stability.

The invention discloses a COF-coated MOF/M/L composite material, which comprises a COF-coated MOF material with a core-shell structure synthesized by a COF-coated MOF crystal material, the MOF of the COF-coated MOF material is firstly subjected to synthesis, then is subjected to metal ion exchange, and then is subjected to ligand exchange to form the COF-coated MOF/M/L composite material with metal ions and chiral ligands. Meanwhile, the invention discloses a preparation method of the COF-coatedMOF/M/L composite material. The COF-coated MOF/M/L composite material disclosed by the invention has the characteristics of a COF-coated MOF material with a core-shell structure; meanwhile, metal ions such as copper or iron with an efficient catalytic degradation function and chiral functional organic ligands such as Llactic acid or histidine are introduced, so that nodes of the MOF have high catalytic activity of monatomic catalysis, and chiral toxic pollutants such as cis-permethrin and cis-permethrin are effectively identified by utilizing chiral-chiral interaction; chiral pollutants can be selectively, quickly, efficiently and thoroughly catalytically degraded into non-toxic substances.

The invention provides a preparation method of a transition metal hexacyanoferrate/titanium dioxide nanocomposite catalyst. According to the preparation method, by taking transition metal chloride or transition metal nitrate, potassium ferrocyanide and titanium dioxide as raw materials, through an in-situ chemical solution method, in-situ growth of transition metal hexacyanoferrate (MHCF) is carried out on the surfaces of titanium dioxide nanoparticles to obtain the MHCF/TiO2 nanocomposite catalyst. The invention also provides a method for degradation of organic pollutants by light-fenton concerted reaction of the MHCF/TiO2 nanocomposite catalyst. According to the method, in dark reaction in the absence of light, the organic pollutants can be degraded by the MHCF in the form of fenton reaction, while under ultraviolet irradiation, the titanium dioxide (photocatalyst) can generate electron-hole pairs, electrons can accelerate reduction of ferric iron oxidized by H2O2 in the MHCF, meanwhile, the MHCF receiving the electrons of the titanium dioxide can also inhibit compounding of photoelectron holes, and then accelerate the generating efficiency of hydroxyl radicals during fenton reaction and a photocatalytic process, and the synergistic effect of the MHCF and the electrons has very high degradation efficiency for various different organic pollutants.

The invention discloses a cellulose nanofibril aerogel loaded with a photocatalyst and a preparation method thereof. The preparation method comprises the steps of: (1) dissolving bismuth nitrate in a cellulose nanofibril suspension liquid, and mixing the substances evenly to obtain a mixed solution; (2) drying the mixed solution obtained in step (1) to obtain cellulose nanofibril aerogel loaded with bismuth ions; (3) dissolving a soluble bromide salt and a soluble chloride salt in deionized water, stirring the substances fully to obtain a halide salt solution; and (4) impregnating the cellulose nanofibril aerogel loaded with bismuth ions obtained in step (2) in the halide salt solution obtained in step (3), then taking the cellulose nanofibril aerogel out for drying, and conducting calcinations, thus obtaining the cellulose nanofibril aerogel loaded with the photocatalyst. The aerogel can achieve catalytic degradation of organic matters under visible light, also has high light utilization rate and good photocatalytic effect, and the nano-photocatalytic material is easy for recycling.

The invention relates to a method for ornamenting FePcS on a crosslinking ball of polystyrene divinyl benzene (abbreviated for a chlorine ball) after being processed through chloromethylate. The FePcS accounts for 0.6-4.5 percent in the whole catalyst in percentage by weight. The catalyst can utilize visible light to activate H2O2 so as to catalyze and degrade waste water produced by organic pollutants such as dye, and the like, wherein the decolorizing rate can reach 100 percent; the chemical oxygen demand (COD) removal rate is more than 93 percent; and the total organic carbon (TOC) removal rate reaches more than 78 percent. The FePcS is loaded on resin, can improve the antioxidant capacity of phthalocyanine and is convenient for recycling, thereby reducing the cost and avoiding secondary pollution.

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 belongs to the technical field of photocatalysts, and in particular relates to a composite photocatalytic material of carbon nitride and bismuth oxyhalide and a preparation method of thecomposite photocatalytic material. The composite photocatalytic material provided by the invention is provided with a layered structure in which carbon nitride is denoted as g-C3N4, bismuth oxyhalideis denoted as BiOXaYb, wherein X and Y represent Cl, Br or I, X is not equal to Y, and the sum of a and b is 1; according to the preparation method, a precursor of g-C3N4 is placed in a muffle furnace to be calcined to obtain g-C3N4, then g-C3N4 is mixed with bismuth nitrate pentahydrate, a surfactant and polyols; two of potassium chloride, potassium bromide and potassium iodide solutions are added; the pH value of the mixed solution is adjusted; an obtained sample is subjected to suction filtration or centrifugation, washed to neutrality, dried, and ground to prepare the composite photocatalytic material of g-C3N4 and BiOXaYb. The composite material has the characteristic of high-efficiency visible light response, and can efficiently catalyze the degradation of emerging organic pollutants represented by bisphenol A in sewage (waste) water under visible light conditions. The preparation method provided by the invention is simple in process, easy to operate, high in output, low in energy consumption, mild in preparation conditions and environmentally-friendly.

The invention discloses a method for preparing a low-VOC glass fiber reinforced polypropylene halogen-free flame-retardant composite material, which comprises the following steps: firstly drying the raw materials; secondly using a twin-screw extruder to melt and blend to prepare glass fiber reinforced polypropylene respectively Masterbatch and hollow glass microbead masterbatch; then the two are mixed and injected through a single-screw injection molding machine to obtain a low-VOC and low-density glass fiber reinforced polypropylene composite material. The composite material obtained by the preparation method of the present invention can catalyze and degrade the VOC in the car efficiently, energy-savingly and environmentally friendly without external ultraviolet light source or equipment; at the same time, hollow glass microspheres coated with a compatibilizer are added, without reducing the strength of the composite material Under the premise, it has good compatibility with glass fiber reinforced PP and can effectively reduce the density. The preparation method provided by the invention is simple and reliable.

The invention discloses a preparation method of a low-temperature plasma modified Mo-TiO2 photocatalyst. The preparation method includes: mixing a titanium source and an inhibitor with an organic solvent and adding glucose and a template agent to obtain a first solution; adding ammonium molybdate and deionized water into the organic solvent to obtain a second solution; dropwise adding the second solution to the first solution, stirring to obtain TiO2 sol, and performing ageing to obtain gel; drying and grinding the gel to obtain Mo-TiO2 after calcination; performing low-temperature plasma treatment. The preparation method has the advantages that the low-temperature plasma modified Mo-TiO2 photocatalyst is high in specific surface area and porosity, energy gap is narrower as compared with Mo-TiO2 and TiO2, good visible-light absorption is achieved, absorption capacity on the photocatalyst is effectively expanded, and volatile organic compounds can be excellently catalyzed and degraded under visible light.

The invention discloses a low-VOC glass fiber reinforced polypropylene burning-slowing composite material and application. The composite material comprises, by weight, 35-75 parts of polypropylene, 4.5-6 parts of hollow glass microbeads, 15-45 parts of glass fiber, 0-4 parts of talcum powder, 0.1-0.5 part of an antioxidant, 0.3-0.5 part of an anti-ultraviolet auxiliary, 1-3 parts of a compatilizer, 1-2 parts of an efficient burning slowing agent and 3-4 parts of an VOC inhibitor. The composite material can catalytically degrade VOC in a vehicle in an efficient, energy-saving and environment-friendly manner without the help of an ultraviolet source or equipment outside; the hollow glass microbeads coated with the compatilizer on the surface are added, so that strength of the composite material is not lowered while the composite material is high in compatibility with glass fiber reinforced PP, and density can be effectively lowered; a small amount of the efficient burning slowing agent is added, so that flame retardance of the composite material is improved. The low-VOC glass fiber reinforced polypropylene burning-slowing composite material can be applied in vehicles and household appliances.

The invention discloses a method of preparing a sludge-based Fe-Zn three-dimensional particle catalyst by residual sludge. The sludge-based Fe-Zn three-dimensional particle catalyst is prepared, by taking residual sludge of a sewage treatment plant caused by flocculation adjustment of polyferric sulfate as material, by the steps of drying, crushing, screening, forming, activating, granulating, carbonizing, cleaning and drying the dehydrated residual sludge. The prepared catalyst fills an effective space between positive and negative electrodes of a three-dimensional electrode reactor for catalyzing electrocatalytic oxidation of the sewage. By taking sludge carbon as a framework, the Fe-Zn structure sludge-based catalyst is prepared by means of ferrum in a polyferric flocculant and zinc inan activator zinc chloride. The preparation process is simple in flow and easy to operate. By following a principle of sustainable development, waste is turned into wealth, pollutants are catalytically degraded efficiently, double purposes of resource utilization of the sludge and efficient removal of degradation-resistant waste water are achieved, and the method has good environmental benefit andeconomical benefit.

The invention discloses a catalyst for degrading hydrogen peroxide. The catalyst comprises an activated carbon carrier, Pd, metal M1 and metal M2, wherein the Pd, the metal M1 and the metal M2 are loaded on the carbon carrier; the mass percentage content of the Pd in the catalyst is 0.3-1.5 percent, the mass percentage content of the metal M1 is 0.1-1 percent, and the mass percentage content of the metal M2 is 0.05-2 percent; the metal M1 is Pt, Ru or Sn; the metal M2 is K, Ag or Ce. In addition, the invention further discloses a preparation method of the catalyst and a method for catalyzing, hydrogenating and degrading the hydrogen peroxide by applying the catalyst. The catalyst disclosed by the invention has very high catalytic activity and stability and can safely and efficiently catalyze and degrade the hydrogen peroxide in a solvent, so that the hydrogen peroxide is converted into water and does not generate oxygen; the degradation rate of the hydrogen peroxide is larger than 99.5 percent. The catalyst disclosed by the invention has an important safety guarantee effect on chemical industrial solvent recycling and is very wide in market application prospect.