76results about How to "Good photocatalysis" patented technology

The present invention relates to a low temperature treating process of self-cleaning TiO2 nanoglass. By using silica and anatase type nanosol as basic components and through pulling process, film is formed on the surface of glass plate. The film is dried at room temperature and cured or treated at temperature below 300 deg.c and cooled naturally. The prepared self-cleaned glass has excellent photocatalytic property, superhydrophilic property, high and homogeneous transparency. The said process is simple, low in cost and suitable for industrial production.

The invention belongs to the technical field of high-concentration dye wastewater, and particularly relates to a segmented treatment method of high-concentration high-chromaticity dye wastewater. In the invention, electrochemical oxidation technology is optimally combined with photocatalytic oxidation technology to become a new electrochemical pre-oxidation-photoelectric collaborative oxidation-photocatalytic oxidation three-segment sewage treatment process, and an Sb*doped SnO2/TiO2-NTs/Ti photoelectronic integrated electrode with excellent photoelectric catalytic properties concurrently is selected as anode material for degradation treatment. The process achieves prospective high-efficient treatment effect, saves energy consumption to the maximum extent, embodies the advantage of saving energy, and provides a brand-new method for the degradation of the high-concentration high-chromaticity dye wastewater, thus having broad application prospect and development potential.

The invention relates to a method for preparing a photoelectric functional compound fabric through fractional in-situ deposition. The method comprises the following steps of: (1) dropwise adding a zinc acetate/alcoholic solution and a sodium hydroxide/alcoholic solution under violent stirring, and mixing to obtain nanometer zinc oxide sol; (2) putting the fabric into the nanometer zinc oxide sol,carrying out soaking and rolling twice, and baking after airing; (3) soaking the fabric obtained in the step (2) into a mixed aqueous solution containing zinc nitrate and a homogeneous precipitation agent, and baking after washing; and (4) soaking the fabric obtained in the step (3) into a mixed aqueous solution containing aniline and protonic acid, airing and then soaking the fabric into a mixedaqueous solution containing ammonium persulfate and protonic acid, extruding and finally continuing to react to obtain the finished product. The preparation method disclosed by the invention is simple and feasible, safe and environment-friendly and has low requirements on equipment performance. The photoelectric multifunctional compound fabric prepared by utilizing the method disclosed by the invention has the advantages of favorable electrical conductivity, flame retardance, antibiotic property, photocatalysis property, antistatic property, electromagnetic wave shielding property and other properties, and wide application prospect.

The invention discloses a preparing method for embellish titanium dioxide nanotube array electrode material embellished by cadmium selenide nano-particles. The preparing method comprises the following steps that (1), a pure titanium piece is used as a substrate, and titanium dioxide nanotube arrays with orderly heights are obtained in fluoride electrolyte in an anodic oxidation method; (2) the titanium dioxide nanotube arrays are used as cathodes, CdC12 serves as electrolyte, super-fine metal Cd nano-particles are deposited to the surfaces and the inner sides of titanium dioxide nanotubes in a potentiostatic deposition method, and CdO-TiO2 nanotube arrays are further obtained in an oxidized mode; (3) the CdO-TiO2 nanotube arrays are placed in Na 2SeSO3 solution, and CdSe-TiO2 nanotube arrays are obtained in a displacement mode. The titanium dioxide nanotube array electrode material made in the method has the advantages of being large in surface ratio, excellent in photoelectrocatalysis performance, good in visible light response, stable in structure and the like, and can be applied to photoelectrocatalysis organic pollution degradation and aquatic hydrogen decomposition.

The invention relates to the field of surface modification of titanium or titanium alloy material and provides a preparation method of a titanium dioxide film grown in situ on the surface of titanium or titanium alloy material in order to solve the problems of large electricity consumption and the influences of electrolyte and the like on the preparation process. The preparation method comprises the following steps of: putting pretreated titanium or titanium alloy material into a high-voltage pulse discharge reactor, taking the titanium or titanium alloy material as an anode of a high-voltage electrode, taking multiple parallelly connected pins or a stainless steel plate or another piece of preheated titanium or titanium alloy material as a cathode of a high-voltage electrode, leading oxygen into the high-voltage pulse discharge reactor, switching on a high-voltage pulse power supply, applying a high-voltage pulse and controlling the oxidation time of oxygen plasmas produced by a discharge of the high-voltage pulse to obtain titanium dioxide film grown in situ on the surface of titanium or titanium alloy material. The preparation method is simple in operation, energy-saving, free of being affected by the electrolyte and broad in application range.

The invention discloses a process for preparing doped titanium dioxide nanocrystal, the steps comprise as follows that compounds of titanium and to-be-doped compounds with elements are dissolved in organic solvent, then fluid A is obtained, the fluid A is slowly dropped into the aqueous solution pH value of which is less than 6, then, the aqueous solution is stirred to form stable colloidal sols, lastly, the colloidal sols are dried. The invention doesn't need special devices and high temperature conditions, the process of preparation is simple, and the colloidal sols of the doped titanium dioxide nanocrystal which are of pure anatase phase structure can be obtained at standard temperature. The obtained nanocrystal particles of doped titanium dioxide is uniform in size distribution, and the diameter of the nanocrystal particles is less than 10 nanometers, which is provided with excellent functions of photocatalysis, deodorization and sterilization.

The invention discloses a method for preparing a silver and titanium dioxide nano-composite at low temperature. The method comprises the following steps: (1) a titanium compound is dissolved in an organic solvent, so as to obtain an A solution; (2) the A solution is dripped into water gradually and stirred to form stable sol, so as to obtain a B solution; (3) a silver compound and diethanolameine are dissolved in the organic solvent, so as to obtain a C solution; and (4) the C solution and the B solution are mixed, aged and dried. The method has the advantages that the method is simple, needs no special device or high temperature condition, and can obtain the silver and titanium dioxide nano-composite at low temperature. In the prepared silver and titanium dioxide nano-composite, the size of silver particles is between 5 and 40 nanometers, and the size of titanium dioxide particles is between 4 and 6 nanometers. The composite has excellent properties in photocatalysis, deodorization and sterilization.

The invention discloses an in-situ preparation method for a cubic copper oxide/graphene aerogel composite material. The method comprises the following steps of: S1) putting a copper net into 1-3M hydrochloric acid, absolute ethyl alcohol and deionized water in turn, performing ultrasonic cleaning and then drying; S2) dispersing graphene oxide into the deionized water and ultrasonically treating for 1-3 hours, thereby acquiring a graphene oxide dispersion liquid in the concentration of 1-5mg mL-1; S3) pouring the graphene oxide dispersion liquid acquired in the step S2) into an autoclave liner, putting the copper net acquired in the step S1) into the autoclave liner and performing hydrothermal reaction, wherein the temperature of the hydrothermal reaction is at 120-200 DEG C and the reaction time is 6-15h; and S4) taking out the product acquired from the step S3), quenching and performing freeze drying, thereby acquiring the copper oxide/graphene aerogel composite material, wherein the freeze drying time is 12-48h, the freeze drying temperature is at -30 to -50 DEG C and the vacuum degree is at 10-30Pa.

The invention discloses titanium dioxide/baffeta with super-hydrophobic and self-cleaning functions. The titanium dioxide/baffeta is prepared by the steps of in-situ generating nanometer TiO2 particles in the baffeta, and cladding the TiO2 particles in the middle of BSA to obtain BSA/TiO2/BSA modified baffeta; then soaking the BSA/TiO2/BSA modified baffeta into a fluoroalkyl silane ethanol solution with the volume fraction being 1 to 10 percent for 1 to 24h, and after finishing reaction, repeatedly cleaning through deionized water, and vacuum drying to obtain the titanium dioxide/baffeta withthe super-hydrophobic and self-cleaning functions. A preparation method provided by the invention has the advantages of simplicity in operation, moderate reaction conditions and the like; the baffetahas an excellent super-hydrophobic performance, an excellent self-cleaning performance, an excellent anti-microbial performance, an excellent uvioresistant performance, an excellent photocatalysis performance, an excellent anti-wrinkle performance and excellent washing resistance.

The invention discloses an LED device with sterilization, formaldehyde removal and illumination functions.An LED light source comprises an UV-LED module and a white LED module.The UV-LED module comprises UV-C LED modules and UV-A LED modules.A nanometer titanium dioxide thin film is arranged in the irradiation area of the UV-LED module.The wave band of the UV-C LED modules is 250-280 nm.The wave band of the UV-A LED modules is 315-400 nm.The visible light wave band of the white LED module ranges from 380 nm to 780 nm.The LED light source has at least four spectrum wave crests corresponding to the LED modules.A spectrum generated by the UV-A LED module intersects with white light generated by the white LED module.The near ultraviolet band of the UV-A LED modules forms a compensation spectrum used for conducting color development compensation on the white light generated by the white LED module.Because the three sterilization, formaldehyde removal and high-color-rendering-property illumination functions are integrated on the same LED device at the same time, the LED device can be widely applied to home wardrobes, cabinets and water heating sanitary products.

This invention relates to a preparation method for square and needle-like nano-titanium dioxide with nanometer microcrystalline cellulose as crystallization inducer. The method comprises preparing nanometer microcrystalline cellulose dispersing solution with concentration of 0.01-5 wt.%, adding additive, ultrasonic-treating, adding titanium tetrachloride into the dispersing solution, wherein the weight ratio of nanometer microcrystalline cellulose to titanium tetrachloride is 1:1-1:150, stirring at 20- 120DEG C for 2-15 hours, and regulating these conditions to obtain square, needle-like nano-titanium dioxide. The invention has the advantages of cheap raw materials, simple process, easy operation, good repeatability, mild reaction conditions, low temperature, short response time, and no torrefaction. Through regulating conditions, the morphology of titanium dioxide can be controlled, achieving regular size distribution and morphology. The nano-titanium dioxide can be widely used in photoelectric materials, decorative materials, and the environmental catalytic materials.

The invention discloses a zinc oxide nanorod functional cotton fiber and a preparation method thereof. The preparation method sequentially comprises the following four steps: cotton fiber anionization, BSA modification of anionized cotton fibers, zinc oxide nanorod modification of cotton fibers and BSA coating. According to the method disclosed by the invention, the zinc oxide nanorod coats the middle of BSA, so that the adhesive ability of the zinc oxide nanorod is greatly improved. The zinc oxide nanorod modified cotton fiber has excellent antibacterial property, ultraviolet resistance, photocatalysis, super-hydrophobic property, crease resistance and washing fastness.

The invention belongs to the field of composite nano particles, and discloses a preparation method of a g-C3N4 coated metal nano composite with a core-shell structure. A simple microwave reaction method is adopted, nano level metal powder and urea are grinded together and evenly mixed in a protective atmosphere, microwaves are utilized to heat magnetic nano particles to carry out reactions, after1 to 10 minutes of reactions, the reaction product is rapidly cooled by placing the reaction product in liquid nitrogen in a protective gas, the g-C3N4 coated metal nano particle with a core-shell structure is synthesized, and the g-C3N4 coated metal core-shell nano powder comprises a magnetic metal inner core, which is coated by g-C3N4. The prepared g-C3N4 coated metal core-shell nano powder composite has the advantages of simple preparation technology, uniform product structure, green and environmentally friendly property, and easiness for massive production. The prepared g-C3N4 coated metalcore-shell nano powder has a wide application prospect in fields such as photocatalysis research, electro-catalysis (hydrogen evolution reaction) research, and the like.

The invention relates to a BiOCl/beta-FeOOH composite nanomaterial and a preparation method thereof, and relates to the technical field of composite nanomaterials. The method comprises the following steps: dissolving FeCl3.6H2O in distilled water, sequentially adding Bi(NO3)3.5H2O and glucose, uniformly mixing, adjusting the pH value of the above obtained mixture to 3-6, and carrying out a hydrothermal synthesis reaction to obtain the BiOCl/beta-FeOOH composite nanomaterial. Low temperature hydrothermal synthesis is adopted, glucose biomacromolecules are used to control attached growth of beta-FeOOH nanorods on BiOCl nanosheets, and spindly BiOCl/beta-FeOOH nanorods are distributed on the sheet BiOCl in the structure of the BiOCl/beta-FeOOH composite nanomaterial, so the composite nanomaterial has the advantages of high specific surface area, and excellent photocatalytic and Fenton-like catalytic activity, and is hopeful to be used as an effective catalyst for removing various organic pollutants from sewage.

The invention relates to the technical field of membrane separation, and provides a preparation method of an MOFs-PVDF composite ultrafiltration membrane with a sterilization function. The preparation method comprises the following steps of: adding an MOFs material into an aqueous solution containing an iron source and a silver source, and stirring and mixing to obtain a precursor solution; adding a sodium hydroxide solution into the precursor solution, stirring, introducing oxidizing gas, filtering and drying to obtain a modified MOFs material loaded with AgO and FeOOH; and adding hydroxyl-containing PVDF, a modified MOFs material and a pore-foaming agent into an organic solvent to prepare a membrane casting solution, applying the membrane casting solution, and carrying out gel curing in a non-aqueous coagulating bath to obtain the MOFs-PVDF composite ultrafiltration membrane with a sterilization function. The MOFs-PVDF composite ultrafiltration membrane prepared by the method is good in hydrophilicity and strong in anti-pollution capability, has sterilization and antibacterial functions, and can be applied to the field of water treatment.

The invention relates to a method for assembling Van der Waals heterojunction photocatalysis and photoelectrocatalysis materials from bottom to top, and belongs to the field of photocatalysis and photoelectrocatalysis materials.The method comprises the following steps that a nanometer powder photocatalysis material is added into a tris (hydroxymethyl) aminomethane aqueous solution, and dispersion is conducted to obtain a solution A; adding dopamine, and carrying out dopamine polymerization reaction on the surface of the powder photocatalytic material to obtain a product B; centrifugally separating, washing, drying and roasting to obtain a product C; adding the product C into deionized water, and dispersing to obtain a suspension D; and immersing a carbon fiber fabric into the suspension D, and assembling the product C and the carbon fiber fabric to form the macroscopic van der Waals heterojunction photocatalysis and photoelectrocatalysis material. The powder photocatalytic material is assembled on the surface of the carbon fiber fabric through Van der Waals action from bottom to top, the obtained product is easy to separate and recover, the method is simple and easy to implement, the process is environment-friendly, the problem of separation and recovery of the powder photocatalyst is solved, and a new way is developed for industrial application of photocatalysis.

The invention discloses a washing-resistant nano-titanium dioxide modified cellulose fiber and a preparation method thereof. Nano-titanium dioxide particles are generated in situ in the cellulose fiber, and the middle of BSA is coated with the nano-titanium dioxide particles, so that the adhesion capacity of the nano-titanium dioxide particles is greatly improved. After being modified by virtue ofthe nano-titanium dioxide particles, the cellulose fiber has excellent antibacterial property, ultraviolet resistance, photocatalysis performance, super-hydrophobic property, wrinkle resistance, washing resistance and self-cleaning property.

The invention relates to a bismuth sulfide composite potassium tantalate niobate catalyst as well as a preparation method and application thereof. The general formula of the catalyst is x%Bi2S3/KTa0.75Nb0.25O3, wherein x is the molar ratio of Bi2S3 to KTa0.75Nb0.25O3 in the catalyst, and x is greater than or equal to 0.1 and less than or equal to 5. The KTa0.75Nb0.25O3 material is applied to piezoelectric catalysis and photocatalytic nitrogen fixation, and N2 is catalytically reduced into ammonia under the action of ultrasonic vibration or illumination. Due to the loading of Bi2S3, the piezoelectric catalysis performance and the photocatalytic ammonia synthesis performance of the KTa0.75Nb0.25O3 are further improved.

The invention relates to a photo-anode composite material, in particular to a preparation method of a Bi2O2CO3/TiO2 photo-anode composite material for photo-generated cathode protection in a spoondrift splash area. The composite material is characterized in that a TiO2 matrix obtained through anodic oxidation treatment is placed in a solution with bismuth nitrate pentahydrate as a bismuth source,urea as a carbon source and water as a solvent to carry out hydrothermal reaction so as to obtain the Bi2O2CO3/TiO2 composite material. Compared with a TiO2 matrix, the prepared composite material photo-anode has the larger photo-generated current density and more negative open circuit potential under visible light irradiation, and effectively prevents corrosion of 304 stainless steel.