32results about How to "Maintain photocatalytic activity" patented technology

The invention belongs to the technical field of polymer materials and relates to an antibacterial polylactic acid composite material and a preparing method thereof. The composite material is prepared from following components by weight: 100 parts of polylactic acid, 10-50 parts of an elastomer, 1-5 parts of modified titanium oxide, 0.2-1.5 parts of a coupling agent, 0.2-1.5 parts of a lubricant and 0.3-1.5 parts of an antioxidant. The nanometer titanium is adopted as a substrate and a certain amount of nanometer zinc oxide is doped, so that the light utilization rate of the titanium oxide is increased, and the composite material can maintain a high antibacterial property under actions of weak visible light. By utilization of a simple preparation process, the polylactic acid composite material with good mechanical properties, good toughness and a good antibacterial property is obtained.

The invention discloses a carbon nitride-supported molybdenum nitride nanoparticle photocatalyst, and a preparation method and an application thereof. The preparation method comprises the steps: firstly, preparing ultra-thin precursors of CN and Mo2N, and then preparing a Mo2N aqueous solution and a CN ethanol dispersion solution; and then dropping the CN ethanol dispersion solution into the Mo2Naqueous solution in a 70 DEG C oil bath, stirring and mixing, then centrifuging, washing and drying to obtain the carbon nitride-supported molybdenum nitride nanoparticle photocatalyst. The photocatalyst has the advantages of wide light absorption range, property of high decomposition of water to produce hydrogen, low electrical resistivity, fast current carrier transfer ability, high photogenerated current carrier separation ability, low current carrier recombination rate, good hydrogen evolution circulation stability and the like, is used for photocatalytic decomposition of water to producehydrogen, and has the highest hydrogen production rate reaching 0.89 [mu]mol.g<-1>.h<-1>. The preparation method has the advantages of simple operation, low cost and non-toxic used raw materials, andconforms to production of the concept of environmental protection.

The present disclosure relates to a photocatalytic composition comprising photocatalytic titanium dioxide particles being dispersed in a continuous phase, and at least one anti-photogreying additive, wherein said at least one anti-photogreying additive is adapted to limit photogreying of said titanium dioxide particles while the photocatalytic activity of said titanium dioxide particles is maintained, and wherein the photo greying index (ΔL) of said composition is less than 6.

The invention discloses an in-situ carbon-coated copper-nickel alloy material photocatalyst and a preparation method and an application thereof. The preparation method comprises the steps: firstly, acopper-nickel bimetallic organic framework (CuNiBTC) is prepared through a hydrothermal method, and a CuNiBTC material is obtained through centrifugation, washing and drying; and vacuum sealing is carried out on a sample by using a quartz tube, and calcining is carried out at high temperature to obtain the in-situ carbon-coated copper-nickel alloy nanoparticle photocatalyst. The in-situ carbon-coated copper-nickel alloy nanoparticle photocatalyst has the advantages of wide light absorption range, high carbon dioxide reduction performance, low electrical resistivity, rapid carrier transfer capability, high photon-generated carrier separation capability, low carrier recombination rate and good carbon dioxide conversion cycle stability, is used for near-infrared light catalytic reduction of carbon dioxide, and has the carbon monoxide precipitation rate up to 11.205 [mu]mol*g<-1>*h<-1>. The preparation method is simple to operate and low in cost, the used raw materials are non-toxic, and the product has a certain economic value and conforms to production of the environmental protection concept.

The invention discloses a plant functional vehicle carpet and a preparation method thereof. The plant functional vehicle carpet contains plant functional polyester fibers, wherein the plant functionalpolyester fiber contains 0.1 to 1.5 percent of plant extract; wherein the plant extract is one or a combination of more of mint, valerian, lavender, wormwood and seaweed; the plant functional vehiclecarpet surface layer and the lining layer are both made of plant functional polyester fibers. The plant functional polyester filament yarn has high mechanical strength of the polyester fiber and miteand bacterium inhibiting performance of the plant extract, is good in bacterium inhibiting, deodorizing and abrasion resisting performance, has high elasticity, is not prone to pilling and contamination, does not carry static electricity or be stained with dust, and solves the problem that an existing carpet is not easy to clean. The carpet surface layer is soft and comfortable, the substrate layer is good in wear resistance, skid resistance and supporting effect, edge curling is not likely to happen, and practicability is higher.

The present disclosure relates to a photocatalytic composition comprising photocatalytic titanium dioxide particles being dispersed in a continuous phase, and at least one anti-photogreying additive, wherein said at least one anti-photogreying additive is adapted to limit photogreying of said titanium dioxide particles while the photocatalytic activity of said titanium dioxide particles is maintained, and wherein the photo greying index (ΔL) of said composition is less than 6.

The invention provides a photocatalyst-containing organic material which is suppressed in the decomposition or deterioration of an organic substance being in contact with a photocatalyst with the photocatalytic function retained, namely, an organic material constituted of a member made of an organic substance and a photocatalyst contained in the member, characterized in that the photocatalyst comprises a base having catalytic activity and a substantially pore-free silicon oxide film covering the base and that the alkali metal content of the photocatalyst is 1 to 1000ppm.

The invention relates to a black phosphorus loaded tungsten nitride nanosheet photocatalyst as well as a preparation method and application thereof. Black phosphorus crystals are prepared, and band gaps of the black phosphorus crystals are changed by a high-energy ball milling method, so that black phosphorus nanosheets are obtained; preparing tungsten nitride nanosheets, and growing the tungstennitride nanosheets on the surfaces of the black phosphorus nanosheets through a high-energy ball milling method. Compared with the prior art, the photocatalyst disclosed by the invention has a wide light absorption range; the performance of decomposing water to produce hydrogen is higher; a response also exists in a near-infrared area; cAPABILITY FOR QUICK TRANSFER OF CARRIERS, the photon-generated carrier separation capability is high; the photocatalyst has the characteristics of low carrier recombination rate, certain hydrogen evolution cycle stability and the like, is used for photocatalytic water decomposition hydrogen production, has the highest hydrogen production rate of 188.42 mu mol.g <-1 >. H <-1 > under visible light, and has the hydrogen production rate of 10.77 mu mol.g <-1 >.H <-1 > under the irradiation of light with the wavelength of greater than 700nm; the preparation method is simple to operate and low in cost, and the used raw materials are non-toxic and environment-friendly.

The invention discloses a preparation technology of a novel, safe and long-acting air-purification ornament. The material of the air purification ornament mainly comprises a base material, a light storage film layer and a photocatalytic purification layer, wherein under the condition of light illumination, the photocatalytic purification layer can be used for continuously catalyzing, decomposing and removing indoor toxic and harmful air, killing all kinds of planktonic bacteria and viruses and purifying the air in all directions; and the light storage film layer can be used for continuously absorbing light energy and converting the light energy into chemical energy for storage, and the stored light energy can be released in the night or under a light-free condition to provide light source for the photocatalytic purification layer, and therefore the photocatalytic purification layer can keep the photocatalytic activity continuously, and the air purification, antibiosis and deodorization can be achieved all day. According to the material of the air purification ornament, not only the function of beautifying the environment by a traditional ornament can be achieved, meanwhile, the indoor environment can be continuously purified all day to improve the air quality, but also the surface self-cleaning function of the photocatalytic purification layer can be utilized to improve the surface cleaning and beauty degree of the ornament; and the air-purification ornament has a good application prospect.

The invention discloses a highly-antibacterial polypropylene composite material and a preparation method thereof. The preparation method comprises the steps that doped nano TiO2 particles are firstly obtained through doping nano TiO2 particles; then modified nano TiO2 particles are obtained by coupling and modifying the doped nano TiO2 particles; and furthermore, the modified nano TiO2 particles and polypropylene are melted and extruded, and then the highly-antibacterial polypropylene composite material is manufactured. The highly-antibacterial polypropylene composite material comprises following raw materials by weight percentage: 63 to 97 percent of polypropylene, 1 to 5 percent of modified nano TiO2 particles, 0 to 20 percent of other inorganic filler, 0 to 10 percent of elastomer, 0.2 to 1 percent of dispersants, 0.1 to 1 percent of antioxidants and 0 to 3 percent of other additives. The preparation method has the advantages that on the basis that the original performance of a polypropylene material is guaranteed, the polypropylene composite material is endowed with excellent antibacterial activity, so that the polypropylene composite material can be excited by weak ultraviolet light in sunlight or lighting lamp light to produce a photocatalysis effect and develop a very strong bacteriostatic ability over Escherichia coli and staphylococcus aureus.

The invention relates to a preparation method of an artificial stone, in particular to a preparation method of an artificial quartz stone with noctilucent function. The artificial quartz stone comprises raw materials containing natural quartz sand, unsaturated resin, accelerator, coupling agent and curing agent, a defined amount of color paste, fluorescent powder and photocatalyst. The artificialstone of the invention has the functions of decoration and indication, has broad-spectrum antibacterial property, can degrade organic pollutants in ambient environment, can remove the waste gas such as nitric oxide and the like, etc.

The invention discloses an acrylonitrile-butadiene-styrene material with an excellent antibacterial performance and a preparation method thereof. The steps include: subjecting nanometer TiO2 particles to a doping process so as to obtain doped nanometer TiO2 particles, obtaining modified nanometer TiO2 particles through a coupling modified process, further performing a melt extrusion of the modified nanometer TiO2 particles and the acrylonitrile-butadiene-styrene to prepare the ABS material with the excellent antibacterial performance, wherein the ABS material with an excellent antibacterial performance consists of the following raw materials of, by weight, 93-97% of the ABS, 1-5% of the modified nanometer TiO2 particles, 0.2-1% of dispersing agents, 0.1-1% of antioxygens and 0-3% of other additives. The acrylonitrile-butadiene-styrene material with the excellent antibacterial performance and the preparation method thereof attach a certain antibacterial performance to the ABS material on the basis of guaranteeing the original performances of the ABC material, and have a good application prospect.

The invention relates to a method for the preparation of aqueous dispersions of TiO2 in the crystalline form anatase, as well as the dispersions obtained with said method, useful for the preparation of photocatalytic coatings for surfaces, and for the photocatalytic decontamination of gases and liquids.

The invention provides a preparation method of an ion filling graphite phase carbon nitride nanosheet. The preparation method mainly comprises three steps of (1) calcination precursor preparation including nitrogen source dissolution and dispersion, nitrogen source and hydrogen chloride combination for generating precursor and precursor drying; (2) precursor sealed calcination; (3) calcination product post-treatment. The preparation method has the advantages that the raw materials are cheap and can be easily obtained; the process is simple; the green and environment-friendly effects are achieved; the industrial production is easy, and the like. Compared with ordinary g-C3N4, the ion filling g-C3N4 nanosheet prepared by the method has the advantages that the energy band gap is low; the photogenerated charge pair separation efficiency is obviously improved; better photooxidation NO removal performance is shown in visible light; after the nanosheet is used for many times, the original photocatalytic activity can be still maintained; high stability is realized.

The invention discloses a photocatalyst for removing condensed water trace steam turbine oil. The photocatalyst comprises the following components by weight percent: 5-20% of nanometer TiO2 powder, 1.3-7% of dispersing agent, 15-40% of toluene diisocynate, 10-20% of addition agent, 5-15% of foam stabilizer and 20-50% of solvent, wherein the dispersing agent refers to low-molecular wax, the addition agent refers to dihydric alcohol or trihydric alcohol; the foam stabilizer refers to silicon polyether or surface active agent containing -SO3H; the solvent refers to deionized water. Nanometer TiO2 is loaded through polyurethane foam by using a special photocatalyst formula. The obtained load-type photocatalyst is low in density, high in load rate and high in photocatalytic efficiency, and can be recycled, so that the economic applicability is strong.

The invention belongs to the technical field of polymer materials, and relates to an antibacterial polylactic acid composite material and a preparation method thereof. The antibacterial polylactic acid composite material is made of the following components by weight: 100 parts of polylactic acid, 10 to 50 parts of elastomer, 1 to 5 parts of modified titanium dioxide, 0.2 to 1.5 parts of coupling agent, and 0.2 to 1.5 parts of lubricant parts, antioxidant 0.3 to 1.5 parts. The invention uses nano-titanium dioxide as a matrix, doped with a certain amount of nano-zinc oxide, improves the light utilization rate of titanium dioxide, and makes the composite material still maintain strong antibacterial performance under the action of weaker visible light; the invention utilizes a simple preparation process , to obtain polylactic acid composites with good mechanical properties, toughness and antibacterial properties.

The present invention belongs to CMF-TiO 2 ‑PDMS composite technology field, disclosed superhydrophobic CMF‑TiO 2 ‑PDMS composite materials and their preparation methods and applications. Amorphous TiO 2 Supported on carbonized melamine material (CMF) framework and treated at high temperature to obtain crystalline CMF‑TiO 2 ; Under the effect of curing agent, polydimethylsiloxane (PDMS) is coated with polydimethylsiloxane (PDMS) in the CMF-TiO by thermal curing. 2 The surface is cross-linked to form a film to obtain CMF‑TiO 2 ‑PDMS composites. The superhydrophobic CMF‑TiO 2 ‑PDMS composite material, which can not only adsorb water-soluble pollutants and oil-soluble pollutants, but also effectively solve the defects of poor hydrophobicity and stability of traditional photodegradation catalytic materials, while showing good durability, stability and UV oxidation resistance .

An antibacterial composite TiO2 particle modified by silver phosphate for paint, ceramics, rubber, etc. is prepared from nanometre-class or submicron-class TiO2 particle as kernel through coating SiO2 layer, alumina layer, or SiO2-alumina layer, and coating silver phosphate layer. Its advantages are high purity dispersity and sure antibacterial action.

The invention discloses an in-situ carbon-coated copper-nickel alloy material photocatalyst and its preparation method and application. First, a copper-nickel bimetallic organic framework (CuNiBTC) is prepared by a hydrothermal method, and the CuNiBTC material is obtained by centrifugation, washing and drying; then After the sample is vacuum-sealed with a quartz tube, the in-situ carbon-coated copper-nickel alloy nanoparticle photocatalyst is obtained after high-temperature calcination, which has a wide light absorption range, high carbon dioxide reduction performance, low resistivity, and fast carrier transfer ability, high photogenerated carrier separation ability, low carrier recombination rate, and good carbon dioxide conversion cycle stability. It is used for near-infrared photocatalytic reduction of carbon dioxide, and the carbon monoxide precipitation rate can reach up to 11.205 μmol g ‑1 h ‑1 . The preparation method has the advantages of simple operation, low cost, non-toxic raw materials, certain economic value of the product, and production conforming to the concept of environmental protection.

The invention discloses a simple blue / black titanium dioxide (TiO 2‑x ) preparation method of photocatalytic material, blue / black titanium dioxide (TiO 2‑x ) photocatalytic material was prepared by reducing commercial titania nanocrystalline particles (P25) with aluminum foil at higher temperature. The main steps are: wrap a certain amount of commercial titanium dioxide nanocrystalline particles with aluminum foil, and use a tablet press to press the aluminum foil containing titanium dioxide into tablets, and finally place it in a tube furnace, and heat it at a higher temperature with a certain amount of gas. time, get TiO 2‑x product. Compared with traditional TiO 2‑x Preparation method, this method has the advantages of simple operation, safe process, and high-throughput preparation. The obtained product has a photocatalytic water splitting hydrogen production performance that is significantly improved compared with commercial titanium dioxide nanocrystalline particles under simulated sunlight irradiation. The industrial application of catalytic production of hydrogen has laid the foundation.