74results about How to "Catalytic degradation" patented technology

The invention relates to a preparation method of a double-shell core-shell structured composite nanoparticle with a cavity, belonging to the technical field of advanced composite nanoparticles. The preparation method comprises the steps of coating a layer of silicon dioxide on an outer layer of a ferroferric oxide nanoparticle, and reacting after modifying by using a silane coupling agent to obtain a polymer-coated composite particle; then, sequentially coating silicon dioxide and titanium dioxide on the outer layer of the composite particle; finally, removing the two silicon dioxide coating layers to obtain the double-shell core-shell structured composite nanoparticle with the cavity. The composite nanoparticle has a core made of the ferroferric oxide nanoparticle, a middle shell made of polymethylacrylic acid and an outmost-layer shell made of titanium dioxide, wherein the cavity exists among the middle shell, the core and the outmost-layer shell. The material obtained by the invention is novel in structure and capable of adsorbing heavy metal ions and catalytically degrading organic pollutants under the excitation of ultraviolet rays; in addition, the composite nanoparticle can be separated and recovered under the action of an external magnetic field.

The invention provides a preparation method of manganese dioxide/carbon cloth composite material. The preparation method comprises the following steps: providing carbon cloth and a permanganate solution, wherein the concentration of the permanganate solution is 10mmol/L-300mmol/L; and putting the carbon cloth in the permanganate solution, and placing the solution for 0.5-48h at the temperature of0-80 DEG C to obtain the manganese dioxide/carbon cloth composite material. The invention also provides the manganese dioxide/carbon cloth composite material and application thereof and an air purification device.

The invention relates to a layered dual-metal hydroxide composite material as well as preparation and application thereof. The preparation method of the composite material comprises the following steps: firstly, preparing hydrothermal carbon from biomass; then, loading a layered composite metal hydroxide on the surface of the hydrothermal carbon through a hydrothermal synthesis method; performingsimple solid-liquid separation, washing and drying to obtain the layered dual-metal hydroxide composite material. The hydrothermal carbon/layered dual-metal hydroxide composite material prepared withthe method can construct a Fenton-like reaction system with H2O2, so that the aim of effectively degrading pollutants such as medicaments, personal-care supplies, endocrine disrupters and organic dyesin a water environment is fulfilled. The hydrothermal carbon/layered dual-metal hydroxide composite material is a composite material catalyst which has the advantages of easiness in preparation, mildreaction conditions, high utilization efficiency, low cost and large application potential.

The invention belongs to the field of recycling and resource recovery of electronic solid wastes and particularly relates to a two-step all-component recycling method of waste circuit boards. The method includes the steps that (1) the waste circuit boards are cut, a non-proton organic swelling agent is added so that epoxy resin-glass fiber composite materials in substrates of the circuit boards can be subjected to swelling, the epoxy resin-glass fiber composite materials are swelled and become fluffy, and meanwhile the interface portions between the epoxy resin-glass fiber composite materialsand copper foils on copper-clad plates are separated; and (2) the swelled circuit board substrates are immersed in a proper catalyst-solvent system, then the epoxy resin-glass fiber composite materials are degraded, the epoxy resins are degraded into soluble low polymers, the epoxy resin low polymers are dissolved through the non-proton organic solvent, and glass fibers, polybrominated biphenyls,the copper foils and other metal components in the waste circuit boards can be recycled. By means of the two-step all-component recycling method of the waste circuit boards, all-component recycling ofthe waste circuit boards is achieved.

The invention discloses a method for degrading a triphenylmethane dye by utilizing recombinational lipoxygenase and application of the recombinational lipoxygenase rLOX-27853 in degrading the triphenylmethane dye. The amino acid sequence of the recombinational lipoxygenase rLOX-27853 is as shown in SEQ ID NO.2. The method for degrading the triphenylmethane dye by utilizing the recombinational lipoxygenase comprises the following steps: adding the recombinational lipoxygenase rLOX-27853 to a medium which contains sodium linoleate and the triphenylmethane dye to degrade the medium. The method disclosed by the invention obtains a novel prokaryotic lipoxygenase gene LOX-27853 by cloning from a pseudomonas aeruginosa ATCC27853 strain genome and realizes the heterogenetic high-efficiency expression of host bacteria in escherichia coli by utilizing a fermentation culture method, thereby efficiently catalyzing the degradation of the triphenylmethane dyes, namely aniline blue, malachite green and brilliant green.

The invention discloses a preparation method of a composite yarn containing metal organic skeleton nanometer fibers and belongs to the technical field of fiber materials. The preparation method comprises the following steps: taking metal salt and mixing with an organic ligand to prepare the metal organic skeleton nanometer fibers; taking the metal organic skeleton nanometer fibers, preparing to obtain suspension liquid, placing coarse yarns in the suspension liquid and preparing the composite yarn containing the metal organic skeleton nanometer fibers through impregnation, twisting and compound treatment. The composite yarn has the characteristics that the specific surface area of a metal-organic framework nanometer fiber material is large, and active sites are more, and can be used for preparing a fabric with functions of moisture and sweat conduction, detoxification, antibiosis and fluorescence sensing.

The invention discloses a magnetic photocatalysis nanometer composite material using bismuth oxide and nickel ferrite and a preparation method thereof. The magnetic photocatalysis nanometer composite material using bismuth oxide and nickel ferrite is mainly prepared from bismuth oxide, nickel ferrite and ferroferric oxide; the bismuth oxide is nanometer powder; the nickel ferrite is nanometer powder; the ferroferric oxide is nanometer powder. The prepared magnetic photocatalysis nanometer composite material using bismuth oxide and nickel ferrite can be recovered in the external magnetic field; the circulation utilization of a catalyst is realized; the cost is reduced; due to the existence is silver, the catalytic degradation of the organic contaminants under the visible light excitation is realized; the application range of the photocatalysis composite material is expanded; meanwhile, the heterojunction is formed through the combination of bismuth oxide and nickel ferrite; the light energy utilization interval is expanded to the visible light region; a matched energy zone structure is favorable for the separation of photo-induced electrons and electron holes; the photocatalysis degradation efficiency is further improved.

The invention discloses a visible light catalysis flat plate type ultrafiltration membrane based on doped nano ZnO and a preparation method and belongs to the technical field of membrane separation. 8.0%-20.0% (w/w) of polysulfone or polyether sulfone, 5.0%-15.0% (w/w) of pore-foaming agent, 0.05%-2.0% (w/w) of surfactant, 0.05%-5.0% (w/w) of doped nano ZnO and 58.0%-86.9% (w/w) of solvent are added into a three-opening round-bottom flask according to a certain sequence, the materials are stirred and dissolved for 5-16 hours at the temperature of 30-80 DEG C till being completely dissolved, standing for defoaming is carried out for 8-24 hours, and a membrane casting solution is prepared; membrane scraping is carried out on a clean glass plate through a phase conversion method, and the visible light catalysis flat plate type ultrafiltration membrane is prepared. The pure water flux of the prepared ultrafiltration membrane is larger than or equal to 430 L/m<2>.hr.0.1 MPa, the bovine serum albumin reject rate is larger than or equal to 90.00%, the fulvic acid degradation removal rate reaches about 65% (operation is carried out for 1 hour under simulated visible light), and good anti-contamination performance and visible light catalysis performance are achieved. The product is especially suitable for micro-polluted source water treatment, seawater desalination pretreatment and treatment, reuse and the like of waste water in the fields of biology, chemical engineering and medicine.

The invention provides a composite nano material for degrading VOC (volatile organic compound) gas and a preparation method of the composite nano material. The preparation method comprises the following steps: taking a multi-walled carbon nanotube as a raw material, and carrying out boron and phosphorus co-doping to obtain a doped multi-walled carbon nanotube; then carrying out modification treatment on the doped multi-walled carbon nanotube by utilizing tris(cyclohexylamino)methylsilane to obtain a modified doped multi-walled carbon nanotube; then compounding the modified doped multi-walled carbon nanotube with bismuth tungstate to obtain a complex; and finally, reacting the complex with p-aminobenzaldehyde and isoniazid, and using polyethyleneimine for modification treatment to obtain acomposite nano material. Catalytic degradation of volatile organic compounds can be achieved under the action of visible light, and the high degradation rate can be achieved for low-concentration VOCgas in a short time.

The invention discloses a visible light catalyzed hollow fiber ultrafiltration membrane based on doped nano Cu2O and a preparation method thereof, and belongs to the technical field of membrane separation. 10% to 25% (w / W) of polysulfone or polyethersulfone, 8%-17% (w / W) of a pore-foaming agent, 0.1%-2% (w / W) of a surfactant, 0.1% to 5% (w / W) of the doped nano Cu2O and 51.0%-81.8% (w / W) of a solvent are added according to a certain order into a dissolving tank, stirred and dissolved at 35 to 95 DEG for 5-16 hours until complete dissolving, then defoamed by standing fo 8-36 hours to obtain a film casting solution; and the visible light catalyzed hollow fiber ultrafiltration membrane is prepared by a traditional dry-wet spinning process. The pure water flux of the prepared ultrafiltration membrane is greater than or equal to 320L / m<2>.hr. 0.1MPa, bovine serum protein retention rate is greater than or equal to 90.00%, the fulvic acid degradation rate is greater than or equal to 60% (under simulated visible light, running for 1 hour), and the prepared ultrafiltration membrane has good anti fouling properties and photocatalytic properties. The visible light catalyzed hollow fiber ultrafiltration membrane is especially suitable for the advanced treatment of micro polluted water source water, pretreatment of sea water desalination and deep treatment and reuse of wastewater pharmaceutical fields, and the like.

The invention discloses a visible-light-catalysis hollow fiber ultra-filtration membrane based on metal-doped nTiO2 and a preparing method, and belongs to the technical field of membrane separation. The preparing method includes the steps that 10.0%(w/w)-25.0%(w/w) of polysulfone or polyether sulfone, 8.0%(w/w)-17.0%(w/w) of a pore-foaming agent, 0.1%(w/w)-2.0%(w/w) of a surfactant, 0.1%(w/w)-5.0%(w/w) of the metal-doped nTiO2 and 51.0%(w/w)-81.8%(w/w) of a solvent are added into a dissolving tank in a certain sequence, the mixture is stirred and dissolved for 5 hours to 16 hours at the temperature of 35 DEG C to 95 DEG C till the mixture is completely dissolved, standing defoaming is carried out for 8 hours to 36 hours, and membrane casting liquid is prepared; the visible-light-catalysis hollow fiber ultra-filtration membrane is prepared with the traditional dry-wet spinning technology. The pure water flux of the ultra-filtration membrane prepared with the method is larger than or equal to 300 L/m<2>.hr.0.1MPa, the bovine-serum-albumin reject rate is larger than or equal to 90.00%, the degradation removing rate of fulvic acid is about 60% (under simulated visible light, running is carried out for 1 hour), and the good antifouling performance and the good visible-light-catalysis performance are achieved. The visible-light-catalysis hollow fiber ultra-filtration membrane is particularly suitable for micro-polluted-water-source water deep treatment, seawater desalinization pretreatment, deep treatment and recycling of wastewater in the field of biology chemical engineering and medicine.

The invention discloses a low-VOC (volatile organic compound) polypropylene material for vehicles and a preparation method of the polypropylene material. The material is prepared from components in parts by weight as follows: 50-90 parts of polypropylene, 5-30 parts of a filling agent, 2-8 parts of a thermal catalyst, 2-8 parts of a flexibilizer, 0.2-2 parts of a lubricant, 0.2-1 part of an antioxidant and 0.2-1 part of a light stabilizer. The preparation method of the material comprises steps as follows: the preparation raw materials are sufficiently mixed, then the mixture is added to a parallel twin-screw extruder for melting, extrusion, granulation and drying are performed, and the low-VOC polypropylene material for the vehicles is prepared. The thermal catalyst can realize functions of adsorption and catalytic degradation simultaneously by supporting a Pt catalyst on the surface of an adsorbent. The VOC catalytic degradation by the thermal catalyst is realized by the aid of heat supplied in extrusion and drying processes, and therefore, the problem about smell of the polypropylene material can be effectively solved.

The invention provides a self-cleaning antibacterial non-woven fabric and a preparation method thereof. The non-woven fabric comprises a polypropylene non-woven fabric base material, chitosan and nano titanium dioxide, wherein the chitosan and the nano titanium dioxide are grafted on the surface of the polypropylene non-woven fabric base material. According to the self-cleaning antibacterial non-woven fabric and the preparation method thereof provided by the invention, chitosan and nano titanium dioxide are effectively grafted on the polypropylene non-woven fabric, and chitosan is used as an antibacterial film-forming agent and titanium dioxide is used as a photocatalyst, so that the self-cleaning and antibacterial properties of the polypropylene non-woven fabric are improved.

The invention discloses a self-cleaning flat plate type PVDF ultrafiltration membrane based on F-TiO2/Fe-g-C3N4 and a preparation method, and belongs to the technical field of membrane separation. 9.0%-19.0% (w/w) of polyvinylidene fluoride (PVDF), 5.0%-13.0% (w/w) of a pore-foaming agent, 0.1%-1.0% (w/w) of F-TiO2/Fe-g-C3N4 and 67.0%-85.9% (w/w) of a solvent are added into a three-neck round-bottom flask according to a certain sequence, stirred and dissolved at 40-90 DEG C for 5-12 h to be completely dissolved, and left to be defoamed for 8-16 h to prepare a membrane casting solution; a membrane is scraped on a clean glass plate by adopting a phase inversion method to prepare the self-cleaning flat plate type PVDF mixed matrix ultrafiltration membrane. The pure water flux of the ultrafiltration membrane prepared by the method is greater than or equal to 330 L/m < 2 >. hr. 0.1 MPa, the bovine serum albumin rejection rate is greater than or equal to 90.00%, the degradation removal rateof humic acid reaches about 90% (under simulated visible light, the ultrafiltration membrane operates for 1 hour), and the ultrafiltration membrane has good anti-pollution performance and visible light catalytic performance. The product provided by the invention is especially suitable for micro-polluted source water treatment, chemical engineering, medicine, seawater desalination pretreatment, treatment and reuse of wastewater in the biological field and the like.

The invention provides an ultrafiltration membrane surface modifier. By mixing diatomaceous earth with titanium dioxide, a mixture is added to an yttrium sulfate solution and mixed with chlorinated paraffin, and then calcining is performed; modification of diatomaceous earth is performed by yttrium sulfatecan to increase internal channels of diatomaceous earth and increase the active center of diatomaceous earth; the decomposition of added chlorinated paraffin during calcining can further increase the channels of the diatomaceous earth, and the performance of the ultrafiltration membrane is enhanced; the surface modification of the ultrafiltration membrane is performed by the modifier to form a coating on the surface of the ultrafiltration membrane, direct contact between the pollutant andthe ultrafiltration membrane is reduced, the pollution of the ultrafiltration membrane is reduced, and anti-pollution ability of the ultrafiltration membrane is increased; and after the ultrafiltration membrane is modified by the ultrafiltration membrane surface modifier, the removal rate of chemical oxygen demand, total organic carbon and ammonia nitrogen in sewage is improved compared with an ultrafiltration membrane without modification, and meanwhile, the surface modifier further contains titanium dioxide, and can catalyze the decomposition and degradation of the pollutants.

The invention provides a method for pre-treating inverted trough water of electroplating pre-treatment. The method is characterized by comprising the following steps of: combining acid out and three-dimensional electrolysis technologies; slowly adding concentrated sulfuric acid into the wax-removing inverted trough water, regulating pH to be 2.0, stopping adding, standing, and demixing; taking supernatant; slowly adding the concentrated sulfuric acid into oil-removing inverted trough water, regulating pH to be 2.0, stopping adding, standing, and demixing; taking subnatant; and mixing two clear solutions, and feeding the mixture in a three-dimensional electrolysis device for electrolysis treatment. According to the method, waste oil and waste wax in the inverted trough can be effectively reclaimed, catalytic decomposition of organic matters in the waste water can be improved, and the biochemical performance of the waste water can be improved.

The invention discloses a visible light catalysis hollow fiber ultrafiltration membrane based on doped nano ZnO and a preparation method and belongs to the technical field of membrane separation. 10.0%-25.0% (w/w) of polysulfone or polyether sulfone, 8.0%-17.0% (w/w) of pore-foaming agent, 0.1%-2.0% (w/w) of surfactant, 0.1%-5.0% (w/w) of doped nano ZnO and 51.0%-81.8% (w/w) of solvent are added into a dissolution tank according to a certain sequence, the materials are stirred and dissolved for 5-16 hours at the temperature of 35-95 DEG C till being completely dissolved, standing for defoaming is carried out for 8-36 hours, and a membrane casting solution is prepared; the visible light catalysis hollow fiber ultrafiltration membrane is prepared through a traditional dry-wet spinning process. The pure water flux of the prepared ultrafiltration membrane is larger than or equal to 300 L/m<2>.hr.0.1 MPa, the bovine serum albumin reject rate is larger than or equal to 90.00%, the fulvic acid degradation removal rate is larger than or equal to 65% (operation is carried out for 1 hour under simulated visible light), and good anti-contamination performance and visible light catalysis performance are achieved. The product is especially suitable for micro-polluted source water deep treatment, seawater desalination pretreatment and deep treatment, reuse and the like of waste water in the fields of biochemical engineering and medicine.