2483 results about "Nanocrystalline titanium dioxide" patented technology

The invention relates to a fluorosilicone material for a super-hydrophobic coating and its preparation method and use method. The fluorosilicone material is prepared from fluorinated nano-silica and/or nano-titanium dioxide sol having two particle sizes. The fluorinated nano-silica or nano-titanium dioxide sol having the small particle size has the average particle size of 10 to 150nm. The fluorinated nano-silica or nano-titanium dioxide sol having the large particle size has the average particle size of 200 to 500nm. Through utilization of fluorine-containing siloxane in silica and/or titanium dioxide preparation, surface energy of the fluorosilicone material as a coating is effectively reduced. Through utilization of non-fluorinated dichlorodialkylsilane, coating surface hydrophily is partly reduced and a fluorine-containing silane use amount and a cost are reduced.

The invention relates to permeable bricks inlaid with nanometer titanium dioxide and a preparation method thereof and belongs to the field of building materials. According to the preparation method provided by the invention, titanium dioxide precursor turbid liquid is evenly sprayed into holes of permeable brick base bodies, and then the permeable brick base bodies are dried and calcined for 10-30 min so as to obtain the permeable bricks inlaid with nanometer titanium dioxide and anatase type nanometer titanium dioxide is uniformly inlaid in the holes of the obtained permeable bricks. The permeable bricks can effectively degrade contaminants in water seepage passing though the permeable bricks and some organic contaminants attached to the surfaces of brick bodies in a manner of photochemical catalysis and also can degrade a part of gaseous pollutants in air in a manner of photochemical catalysis.

This invention relates to methods of making single phase nanocrystalline titanium dioxide. It is hereby provided a method for preparing single-phase anatase type titanium dioxide photocatalyst having a particle size of nano level at near room temperatures without the need for a sintering process at high temperatures.

The invention relates to the energy storage field and discloses MOS2 (molybdenum disulfide) and TiO2 (titanium dioxide) nanocomposites and a production method thereof. The MOS2 and TiO2 nanocomposites are composite materials of nano molybdenum disulfide and titanium dioxide, namely the MOS2 and TiO2. The MOS2 and TiO2 nanocomposites are obtained through the two-step hydrothermal method which comprises, to be specific, growing titanium dioxide nanorods on a seed layer through the auxiliary hydrothermal method and coating a layer of molybdenum disulfide on the outer layer of the titanium dioxide nanorods through the direct hydrothermal method. According to the obtained MOS2 and TiO2 nanocomposites through production, the energy can be effectively stored and a good method is provided for the existing energy storage problem due to the high specific surface area of the titanium dioxide one-dimensional nanorods and the excellent super capacitance performance of the molybdenum disulfide. According to the production method, the energy consumption is low, the condition is simple, the large-scale production is easy and the like.

The present invention relates to an antibacterial and antiviral non-woven fabric, a preparation method of the fabric and a mask containing the fabric. The antibacterial and antiviral non-woven fabriccontains nano-silver, and also contains an inorganic antibacterial agent and/or an organic antibacterial agent; the inorganic antibacterial agent comprises any one or combination of at least two of nano titanium dioxide, nano zinc oxide, bismuth tungstate and nano silicon dioxide; and the organic antibacterial agent comprises chitosan and/or quaternary ammonium salt. The mask sequentially comprises a first fabric layer, the antibacterial and antiviral non-woven fabric and a second fabric layer from inside to outside. While the air permeability is not affected, the mask is endowed with the long-acting antibacterial, anti-haze and antiepidemic antiviral properties, has the catalytic degradation function for harmful gases such as formaldehyde and benzene in air, and can be repeatedly washed with water to be recycled, thereby greatly reducing the use cost of the protective mask.

The invention discloses high-pollution-resistant high weatherproof water-based external wall emulsion paint and a preparation method thereof. The external wall emulsion paint comprises hydrophilic self-crosslinking acrylic emulsion, titanium dioxide, non-transparent polymer, precipitated silica, attapulgite, talcum powder, rutile type nano titanium dioxide, auxiliaries, water and other components. The invention aims at overcoming the defects in the prior art and providing external wall paint with high weather resistance and stain resistance and relatively low production cost; and the invention also aims at providing a method for preparing the external wall paint.

The invention discloses a nano-titanium dioxide composite material for wastewater treatment, which is composed of (a) nano-titanium dioxide, (b) adsorptive porous material and (c) nano-titanium dioxide modified material; the nano-titanium dioxide modified material includes Inert metals Ag, Au, Pt or/and transition metal ions Cr, Mn, Fe, Co, Ni, Cu or/and rare earth metal ions La ³⁺ , Y ³⁺ 、Eu ³⁺ Or/and Fe‑Sn, Fe‑La. The nano-titanium dioxide composite material of the present invention is composed of nano-titanium dioxide modified material, nano-titanium dioxide, and adsorptive porous material, which improves the photocatalytic activity of nano-titanium dioxide and the utilization rate of light, as well as the utilization rate of nano-titanium dioxide. The decomposition of matter has a significant effect.

The invention provides a grading three-dimensional porous graphene/titanium dioxide photocatalyst and preparation method thereof. The photocatalyst is composed by a three-dimensional grapheme framework and nano titanium dioxide particles; the grahene is provided with a macroporous structure; titanium dioxide is mesoporous titanium dioxide; the macropores and the mesopores are communicated; the nano titanium dioxide particles are scattered on a grapheme nano sheet; the surfaces of nano titanium dioxide microspheres are wrapped with graphene nano sheets; the macropores of the graphene are filled with the nano titanium dioxide microspheres. The photocatalyst with a three-dimensional structure can not only prevent the graphene sheet layers from stacking, but also scatter titanium dioxide particles excellently, and is high in specific surface area; besides, samples can be used for photocatalysis degradation of methylene blue, and the methylene blue can be fully degraded in 25 minutes. The preparation method provides a new thought for preparation of the photocatalyst, and has a potential application value in the fields of energy sources and environment.

The invention discloses a preparation method of graphene loaded with anatase type nano titanium dioxide and an application thereof. The preparation method comprises the following steps: preparing graphite oxide from crystalline flake graphite; carrying out reduction reaction on the graphite oxide to obtain graphene by taking hydrazine hydrate as a reducing agent and sodium dodecyl benzene sulfonate as a dispersing agent; preparing titanium hydroxide colloidal solution by taking tetrabutyl titanate as a titanium source; mixing the ethanol solution of graphene and the titanium hydroxide colloidal solution, stirring and calcining to prepare the graphene loaded with anatase type nano titanium dioxide. The graphene loaded with anatase type nano titanium dioxide prepared by the method can be mixed with copper powder to prepare the negative electrode of a nickel-hydride secondary battery. The method provided by the invention has the advantages of simple preparation process and low cost and is easy to operate. When the prepared graphene loaded with anatase type nano titanium dioxide is used as the active material of the cathode of the secondary battery, the effects of high discharge specific capacity and good circulation stability are achieved.

The invention discloses a cellulose acetate/nano titanium dioxide mixed media hollow fiber positive osmotic membrane. 0.05-4.0% (w/w) of nano titanium dioxide and 0.01-1.0% (w/w) of oxidized graphene are added into a solution composed of N-methyl-pyrrolidone or dimethylacetamide or dimethylformamide and 1,4-dioxane, 3.0-21.0% (w/w) of additives is added, uniform stirring is carried out for 5-60min, then 15.0-40.0% (w/w) of cellulose acetate is added, full stirring is carried out at a temperature of 20-70 DEG C, the mixture is allowed to stand, and a hollow fiber positive osmotic membrane is obtained through spinning. The osmotic membrane employs 1M of NaCl as a drive liquid and deionized water as a raw material liquid, the water flux is 16.5L/m2h, the reverse salt flux is less than 3.5g/m2h, and the contact angle is 60.2 degrees in test time of 1h.

The invention relates to an adsorbent for adsorbing dye in water, and its preparation, application and regeneration methods. The adsorbent provided by the invention is prepared by in situ composition of polypyrrole and titanium dioxide. The mass ratio of titanium dioxide to polypyrrole in the composite adsorbent is 1: 0.05-50. The preparation method comprises the following steps of: using an organic or inorganic titanium source as a raw material, and adopting a sol-gel method at the temperature of 0-100 DEG C to prepare a titanium dioxide sol; Mixing the obtained titanium dioxide sol with a pyrrole monomer at the temperature of minus 20-80 DEG C, realizing in situ composite by the chemical oxidation process, filtering and drying to obtain the polypyrrole nanometer titanium dioxide composite adsorbent. By the adoption of the adsorbent, dye in high-density dye wastewater can be effectively adsorbed. The preparation method is simple, and has short process and mild reaction condition; theaddition quantity of the prepared adsorbent during the dye wastewater treatment process is little; the adsorption balance time is short; the adsorbent can be repeatedly regenerated and used for a long time; and the regenerated adsorbent still has high adsorption performance.

The invention belongs to the field of water repellent finishing and processing of fabric, and particularly relates to freon-free super hydrophobic UV resistant cotton fabric and a method for preparing the same. The freon-free super hydrophobic UV resistant cotton fabric is prepared by padding a fabric with nanometer titanium dioxide sol and processing the fabric by using a long-chain freon-free alkyl compound. The titanium dioxide content of the titanium dioxide sol is 0.2 to 5.0 weight percent, and the number of long-chain carbon atoms of the long-chain freon-free alkyl compounds is 6 to 18. The contact angle between the prepared cotton fabric and water drops is over 150 degrees, so that the cotton fabric has a super hydrophobic property; and the UV resistant factor of the prepared cotton fabric is over 50+, so that the cotton fabric has high UV resistance.

The invention provides waterproof air-permeable antibacterial anti-ultraviolet reinforced coating adhesive for textile and a preparation method of the waterproof air-permeable antibacterial anti-ultraviolet reinforced coating adhesive. The adhesive is prepared by mixing the following raw materials in parts by weight: 65-68 parts of a water-based polyurethane waterproof permeable adhesive, 10-15 parts of polyethylene glycol having the average molecular weight of 600, 2-3.5 parts of a TDI tripolymer curing agent, 3-4 parts of anionic amino silicon oil emulsion, 5-7 parts of an anionic or non-ionic fluorine-containing waterproof agent, 5-7 parts of a phenylamide anionic antibacterial deodorant agent, 1.5-2.5 parts nano-zinc oxide powder and 1-2 parts of nano-titanium dioxide powder. The coating adhesive is simple and convenient to produce and convenient to use, has good waterproof color fastness, and is suitable for 10D-20D polyester, chinlon cloth fabric functional coatings.

The invention provides a manufacturing method of a nano modified melt-blown nonwoven fabric material. The manufacturing method includes steps: modifying nano titanium dioxide and nano silicon dioxide; mixing modified nano titanium dioxide and nano silicon dioxide with polypropylene chips to obtain a polypropylene melt-blown nonwoven fabric; subjecting the nonwoven fabric to electret treatment through a corona electret process. The nano titanium dioxide and the nano silicon dioxide are modified and then mixed with the polypropylene chips, manufactured products are high in strength and great in mechanical property without subsequent finishing, and defects of insufficient strength of existing melt-blown nonwoven fabrics and poor breathability and thickness of composite nonwoven materials are overcome. In addition, the nano modified melt-blown nonwoven fabric material has antibacterial, deodorization and formaldehyde removal functions and the like.

The method for determining chemical oxygen demand (COD) of water body by using nano titanium dioxide powder includes the following steps: 1. preparing reaction liquor; 2. potocatalysis and degradation; 3. measuring absorbancy A; and 4. solving COD value.

The invention discloses a preparation method of double-self-cleaning fabric. The method comprises steps as follows: 1, modified nano titanium dioxide is added to water; 2, the fabric is irradiated for treatment; 3, the fabric treated in the step 2 is soaked in a modified nano titanium dioxide water solution prepared in the step 1 and then taken out to be dried, and the self-cleaning fabric is obtained. The preparation method adopts a simple process, the cost is low, and industrial production is easily realized. The fabric prepared with the method has double self-cleaning effects including a photocatalytic self-cleaning effect and super-hydrophobic self-cleaning effect and has lasting photocatalytic activity.

The invention discloses a cerium-doped nano titanium dioxide/activated carbon fiber composite photocatalyst for air purification and a preparation method thereof. The preparation method comprises the following steps: doping cerium nitrate into nano titanium dioxide to obtain the cerium-doped nano titanium dioxide suspension, putting proper amount of activated carbon fiber into the suspension, soaking for 20-60 minutes under ultrasonic conditions, taking out, airing, and keeping the temperature at 200-220 DEG C for 2-4 hours, thereby obtaining the cerium-doped nano titanium dioxide/activated carbon fiber composite photocatalyst for air purification. Compared with the prior art, the rare-earth cerium is doped into the nano titanium dioxide, thereby prolonging the service life of photovoltaic electron-hole pairs, enhancing the quantum effect of the nano titanium dioxide, and further enhancing the photocatalytic activity of the nano titanium dioxide; and the whole method is simple and easy to control; and the product prepared by the method has high degradation efficiency for volatile organic pollutants, especially formaldehyde gas, reaching more than 90%.

The application discloses a wear resistant polytetrafluoroethylene material and a preparation method thereof. The method comprises steps of: preparing polytetrafluoroethylene, aluminum oxide, bronze powder, silica, glass fiber, LCP, a coupling agent, graphite, molybdenum disulfide, GF, a flame retardant, UHMWPA, POM, PC and nano-titanium dioxide in parts by weight; mixing the substances; and extruding the mixture. For a product, the tensile strength is 27-32 MPa, and the breaking elongation is 300-320%; the Shore hardness is 60-80, and the abrasion amount is 0.001-0.005 mg; and the relative density is 2.6-2.8, and the wear width is 3.4-3.5 mm/h.

The invention discloses a method for preparing an inorganic particle/epoxy resin super hydrophobic film. The method is characterized by comprising the following steps: (1) preparing amination nano silica and nano titanium dioxide particle; (2) preparing coating sol; (3) coating the sol on a substrate material; (4) performing post-treatment on substrate material, and finally preparing the inorganic particle/epoxy resin super hydrophobic film. The method is simple in process and good in repeatability, and the prepared coating has excellent super hydrophobicity and self-cleaning property and is suitable for industrial production of super hydrophobic paint.

The invention relates to a process for preparing a nanometer titanium dioxide ternary photocatalyst doped with nitrogen and rare earth elements. The process comprises the following steps of respectively preparing an aqueous solution of rare earth salt, an aqueous solution of titanium tetrachloride absolute ethanol and a nitrogen-containing compound solution; dropwise adding the aqueous solution of rare earth salt into a three-necked flask with a mixed solution, uniformly stirring and simultaneously dropwise adding the aqueous solution of titanium tetrachloride absolute ethanol and the nitrogen-containing compound solution, uniformly stirring, adding activated carbon, and further uniformly stirring; and finally aging at room temperature and drying to obtain a solid, grinding the obtained solid and calcining to obtain the nanometer titanium dioxide ternary photocatalyst doped with nitrogen and rare earth elements. The nanometer titanium dioxide ternary photocatalyst doped with nitrogen and rare earth elements, which is prepared by the process, has an efficient photocatalytic degradation effect on pollutants, especially organic pollutants.

The invention discloses a high-corrosion-resistant and wear-resistant coating and a preparation method thereof. The coating comprises a base layer and a surface layer, wherein a base layer paint coats a base material to form the base layer, and a surface layer paint coats the base layer to form the surface layer; the base layer paint comprises the following components in percentage by weight: 50-60% of polyether ketone, 20-30% of fluororesin, 10-20% of epoxy resin, 2.0-8.0% of organic silicon resin, 0.1-0.4% of a leveling agent, 0.5-1.5% of a wetting agent and 0.1-0.4% of a defoaming agent; and the surface layer paint comprises the following components in percentage by weight: 8-16% of polyether ketone, 75-85% of fluororesin, 3.0-7.0% of nano-titanium dioxide, 0.5-1.5% of a wetting agent, 0.1-0.4% of a leveling agent, 0.1-0.4% of a defoaming agent and 0.3-1.0% of a pigment. The preparation method comprises the following steps: uniformly spraying the base layer paint by using a corona discharge type electrostatic powder spray gun, then baking under the condition that the baking temperature is 240-330 DEG C, so as to form the base layer, directly spraying the surface layer paint without cooling after the base layer is formed, spraying the surface layer paint, and baking to form the surface layer so as to ensure that the high-corrosion-resistant and wear-resistant coating disclosed by the invention is prepared. According to the high-corrosion-resistant and wear-resistant coating disclosed by the invention, the base material and the base layer are closely combined, and the base layer and the surface layer are also closely combined, so that the high-corrosion-resistant and wear-resistant coating has the advantages of high adhesive force, high corrosion resistance, abrasion resistance and impact resistance.

The invention relates to an air purification lacquer and a preparation method thereof. The air purification lacquer is prepared by taking a water-based acrylic emulsion as an adhesive, taking 5A molecular sieve powder and an active carbon fiber as adsorbents and microelectrodes, taking nano-titanium dioxide as a photoelectric conversion agent, taking nano silver as a doping agent, taking copper phthalocyanine as a photosensitizer, taking a silane coupling agent and an organic silicon hydrophobing agent as hydrophobic modifying agents, taking quartz sand as an aggregate, taking tourmaline as a negative ion accelerating agent and taking citric acid as a pH value regulating agent. The air purification lacquer disclosed by the invention has similar photosynthetic functions of absorbing harmful substances for 24 hours day and night and decomposing the harmful substances under light irradiation at daytime and similar plant functions of releasing negative ions to air, so that dust is increased in granule diameter due to the effect of electrostatic attraction so as to accelerate sedimentation.

The invention discloses a method for preparing a rice hull active carbon/silicon dioxide/titanium dioxide composite material in the technical field of preparation of nano titanium dioxide photocatalysts. The method comprises the following steps of: carrying out acid cleaning on rice hull powder; adding an NaOH solution into the rice hull powder which is subjected to acid cleaning and carrying out alkali cooking to obtain mixed size consisting of rice hulls and sodium silicate; preparing a rice hull/silicon dioxide/titanium dioxide precursor; and finally carrying out carbonization and activating treatment to prepare the rice hull active carbon/silicon dioxide/titanium dioxide composite material. The rice hulls and nano titanium dioxide are combined in a chemical bond mode by silicon dioxide. The rice hull active carbon/silicon dioxide/titanium dioxide composite material not only has excellent adsorption performance of rice hull active carbon, but also has excellent photocatalysis performance of the nano titanium dioxide. The problem that the nano titanium dioxide is easy to fall off on the surface of a vector is effectively avoided. The stability of the composite material is greatly improved. The method has the advantages of simple preparation process, low price of raw materials, low cost and low pollution.

The invention provides a silver-loaded nano-titanium dioxide/polrvinyl chloride membrane and a preparation method thereof. The method comprises the following steps of: dissolving polrvinyl chloride in an N-N-dimethylacetamide solvent; adding silver-loaded nano-titanium dioxide, and immediately adding a dispersant, namely sodium hexametaphosphate; adding a pore-forming agent, namely polyvinylpyrrolidone; standing at the temperature of between 20 and 30 DEG for 1 to 2 days for deaeration; casting deaerated casting solution to form a membrane at the temperature of between 15 and 30 DEG C under the humidity of between 40 and 80 percent; volatizing the casting solution in the air for 10 to 100 seconds after the membrane is cast, slowly placing into ethanol coagulation liquid at the concentration of between 10 and 50 percent and soaking for 12 to 24 hours; and taking the membrane out from the coagulation liquid and rinsing by using distilled water to obtain the silver-loaded nano-titanium dioxide modified polrvinyl chloride separation membrane. By the method, organic membranes are subjected to antibacterial modification, the disinfection and antipollution performance of the membranes can be improved, and the clear water filtration flux of the membranes can be improved.