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

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 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 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.