95results about How to "Has photocatalytic properties" patented technology

The invention relates to environmental protection paint, in particular to nano shell powder ecological functional flatly painted coating. The coating is prepared from shell powder (calcined), ash-calcium, kaolin, heavy calcium carbonate, hydrated magnesium silicate, titanium dioxide, vinyl acetate, hydroxyethyl cellulose, polyving akohol, polydimethylsiloxane, a water reducer and a defoamer. The coating solves the problem that indoor ornament or decoration paint is not environment-friendly. The coating has the characteristics that the coating is antifungal, purifies the air, prevents mildew, adopts a spiral pore structure, is 3.0mm in press coating thickness and high in glossiness, does not has obvious color aberration, is resistant to shock, abrasion, water, high and low temperature weather and aging, and ensures that the service life of a product reaches more than 20 years.

A process for preparing photocatalytic material from TiO2-contained slag of blast furnace and less compound of transition metal or RE includes breaking raw materials, dressing, pre-calcining, proportioning, ball grinding, carrying, drying, calcining and cooling. After its slurry is carried on the surface of ceramics, metal, glass, or building material, it can decompose the organic pollutant in water, and cleaning and deodouring ambient air.

The invention relates to an expanded graphite zinc oxide composite photocatalyst and a preparation method thereof. The composite photocatalyst comprises: 10%-99% of expanded graphite and 1%-90% of zinc oxide by weight percentage. The preparation method comprises: (1) adding expanded graphite to sodium hydroxide solution at a mass volume ratio of 1-2 g: 100 ml, and stirring at room temperature for 0.5-3 hours to obtain a reaction liquid; : Add 0.1-5 zinc acetate solution into the above reaction solution, react at 50°C-90°C for 2-6 hours, vacuum filter the mixed solution, and dry the filter residue at 60°C-120°C. The invention not only avoids the agglomeration of its own particles, but also effectively prevents the reaccumulation of expanded graphite sheets; the raw materials of the preparation method are common and easy to obtain, the cost is low, and it has good application prospects.

The invention relates to an attapulgite-graphite-like carbon nitride composite ceramic microfiltration membrane with photocatalytic performance and a preparation method thereof and belongs to the field of ceramic membranes. The method comprises the steps of preparing casting solution slurry from titanate coupling agent modified attapulgite and melamine; and preparing a wet membrane of the ceramic microfiltration membrane through a dip-coating method, airing at a room temperature and roasting to prepare the attapulgite-graphite-like carbon nitride composite ceramic microfiltration membrane. A separation layer of the ceramic microfiltration membrane is prepared from attapulgite fibers and graphite-like carbon nitride and the attapulgite fibers are disorderly stacked into the separation layer, so that relatively large total porosity and superficial area are provided for the separation layer; coupling of photocatalysis and separation processes can be achieved by using the photocatalytic performance of the graphite-like carbon nitride, and self-cleaning of the membrane is achieved; and the graphite-like carbon nitride is uniformly and dispersedly immobilized on the surface of attapulgite of the membrane through the chemical bonding effect, so that the disadvantages that granular graphite-like carbon nitride is easy to aggregate, difficult to separate and difficult to reuse in the using process are effectively avoided.

The invention provides a preparation method of titanium dioxide coated nano-copper with a core-shell structure. The preparation method can be used for forming the nanocomposite with the core-shell structure by coating titanium dioxide on nano-copper particles. The preparation method is based on the principle of in-situ hydrolysis, and comprises the steps of mixing the nano-copper particles, which are taken as a nuclear material, with a titanium source, and then forming a layer of shell structure on the surfaces of the nano-copper particles by virtue of the high hydrolysis of the titanium source. The preparation method has the characteristics of few raw material types, simplicity and convenience in operation, simple process, environmental protection and the like, and the prepared nanocomposite has photocatalytic performance and an obvious degradation effect on organic pollutants, such as 2,4-dichlorophen, in visible and ultraviolet light respectively, thus having a certain actual application value.

The invention discloses a method for preparing BiVO4 with photocatalytic performance under visible lights. The method comprises the steps that a bismuth-containing compound and a vanadium-containing compound are respectively dissolved in deionized water at first to be mixed, NaOH solution is then added so as to form precursor solution, the precursor solution is put in a polytetrafluoroethylene reactor to generate yellow precipitate, deionized water and absolute ethyl alcohol are finally used to wash, and drying is carried out to obtain BiVO4 powder. Concentrated nitric acid is not used as an inhibitor to inhibit the hydrolysis of Bi(NO3)3.5H2O when the precursor solution is prepared, but Bi(NO3)3.5H2O is directly dissolved in deionized water, so that the method has the characteristics of simplicity in operation, moderate conditions and short reaction time. The BiVO4 powders with different crystalline phases can be selectively prepared through regulating the pH value of the precursor solution, and the prepared powder has certain photocatalytic performance under visible lights.

The invention discloses a CdS/ZnO composite piezoelectric photocatalyst and a preparation method and application thereof. The method comprises the steps that firstly, a ZnO nanorod is synthesized through a solvothermal method, and then a chemical bath is carried out to synthesize the CdS/ZnO composite piezoelectric photocatalyst by taking the ZnO nanorod as a precursor through the action of electrostatic adsorption. The catalyst is a piezoelectric photocatalyst formed by compounding CdS and ZnO which have piezoelectric properties, the catalyst utilizes a piezoelectric electric field to promotethe separation of photo-generated carriers for enhancing the photocatalytic activity, the interior and space separation of the photo-generated carriers is also achieved, thereby reducing the recombination of the photo-generated carriers and increasing the utilization rate of the solar energy, and the piezoelectric photocatalytic rate reaches 5.477 min<-1>, which is four times of the photocatalytic efficiency of CdS alone. The CdS/ZnO composite piezoelectric photocatalyst and the preparation method and application thereof have the advantages that the raw materials are easy to obtain, the preparation method is simple, the operation is convenient, the stability of the composite material is better, and a feasible strategy is provided for improving the photocatalytic performance.

The invention discloses a core-shell structure hybrid sol with photocatalysis characteristic, and a preparation method and application thereof. The core-shell structure hybrid sol is prepared by using a photocatalysis nanoparticle as a core and polymerizing a layer of organic polymer on the surface of the nanoparticle by an in situ polymerization method. A film coating solution prepared by the sol can directly coat the surface of an organic substrate under the normal temperature condition to form a layer of transparent thin film; through one surface, in contact with the organic substrate, of the thin film, the photocatalysis nanoparticle can be effectively adhered, and a self isolation effect is achieved, so the destroy of a nanometer photocatalyst on the organic substrate in a use process is effectively avoided; after certain UV (ultraviolet) light or sunlight irradiation, organic matters at an outermost layer can be decomposed and micronized by the nanometer photocatalyst, so that the nanometer photocatalyst is exposed, and thus the whole coating has good self cleaning and contamination resistant performance; in addition, the thin film also has the function of absorbing and isolating ultraviolet rays; the protection effects such as color retention and aging resisting on the organic substrate can be achieved.

The invention relates to a modification method for nanometer titania. The method mainly solves the problems that existing titania cannot be stably and evenly dispersed in a polymer matrix and does not have the photocatalytic performance. According to the adopted modification method for nanometer titania, the calcinated nanometer titania and dried 2,2-dimethylolpropionic acid are placed into an alcohol solvent, ultrasonic dispersion processing is performed for 0.5-1.5 h, then, the reaction is continuously performed for 20-30 h at the temperature of 70-90 DEG C under the protection of nitrogen, then solid particles are separated out in a centrifugal machine, the separated particles are dissolved in methyl alcohol or dimethyl formamide again, separation is performed again till a solution is limpid, and the 2,2-dimethylolpropionic acid modification nanometer titania obtained through final separation is placed in a vacuum oven to be dried. According to the technical scheme, the problems are solved, and the method can be used for modification of the nanometer titania.

The invention provides a functional cellulose aerogel composite material, and a preparation method thereof. The functional cellulose aerogel composite material comprises mutually penetrated nanometercellulose aerogel and inorganic aerogel, and comprises, by mass, 10 to 50% of CNF, 40 to 90% of SiO2, and 0 to 20% of TiO2. According to the technology, organic-inorganic hybrid processing is adopted,so that cellulose aerogel high porosity is maintained, the compression strength and the hydrophobicity are increased greatly, the adsorption capacity is high, the heat conduction coefficient is low,photocatalysis performance is achieved, the obtained composite material possesses a porous three dimensional network skeleton structure characteristic of cellulose aerogel, aerogel material high brittleness and hydrophily are avoided, technology is simple, control is convenient, and cost is low.

The invention provides a CuS/Bi2WO6 heterojunction photocatalyst as well as a preparation method and application thereof. In the preparation method, Bi2WO6 is added in a CuS precursor solution with thiourea and cupric acetate as raw materials, CuS/Bi2WO6 is synthesized in situ with a co-precipitation-hydrothermal method, and the CuS/Bi2WO6 heterojunction photocatalyst of a nanoparticle structure can be prepared without a surfactant and a complex technological condition. The preparation method is simple in preparation process, low in cost and strong in controllability of the reaction conditionand does not have toxicity; micro-particles of the prepared photocatalyst are CuS nano-sheets to be dispersively distributed on the surfaces of Bi2WO6 nanoparticles, and two phase interfaces form a heterojunction structure, so that the absorption range of visible lights is expanded, and the photocatalyst has more excellent photocatalytic activity compared with a single CuS semiconductor and has better acid resistance in photocatalytic reaction compared with single Bi2WO6; and meanwhile, the photocatalyst has relatively high crystallinity without generation of other impurities.

The invention discloses a gypsum board composed of raw materials and a binder. The raw materials comprises by weight: 20-40% of bamboo charcoal and 60-80% of gypsum powder. And the binder accounts for 20-35% of the total weight of the raw materials. Meanwhile, the invention also provides a preparation method of the gypsum board. The method sequentially includes the steps of: 1) mixing the bamboo charcoal and gypsum powder and stirring the them for 1-12h so as to obtain the raw materials; 2) adding a TiO2 sol into the raw materials and mixing them for 1-4h, thus obtaining a mixture; 3) subjecting the mixture to high pressure molding, then curing and finally heat treatment, thus obtaining the gypsum board. The gypsum board provided in the invention has the functions of adsorption, far-infrared radiation and anion release, etc.

The invention discloses a preparation method of a composite photocatalytic material for fresh-keeping of fruits and vegetables and a process thereof, comprising preparation of sol through acidic hydrolysis with titanium ester as a raw material, or preparation of absorption type composite photocatalytic material through ultrasonic dispersion of nano titanium dioxide in water and water heating treatment after adding activated carbon fiber, wherein the titanium dioxide is the main catalyst of the absorption type composite photocatalytic material, and the activated carbon fiber is the carrier and the supporting mass thereof. The prepared material can transform ethylene, ethanol, acetaldehyde and the like generated in breathing of fruits and vegetables in processing plants and refrigerators for the fruits and vegetables, and hydrogen sulfide, ammonia and other common volatile contaminants generated in rotting of the fruits and vegetables into harmless materials through photocatalytic reaction under the ultraviolet irradiation. Simultaneously, the invention has the function of killing bacteria and microbes, thereby ensuring that the fruits and vegetables are fresh and safe to eat.

The invention discloses a novel nanometer titanium dioxide self-cleaning fluorine-carbon aluminum single sheet as well as a low-temperature preparation method and application thereof. The surface of the fluorine-carbon aluminum single sheet is coated with a self-cleaning nanometer titanium dioxide film or a nanometer titanium dioxide and silicon dioxide composite film; the film is uniformly distributed on the surface of the fluorine-carbon aluminum single sheet, and thickness of the film is 1-3 micrometers; and after being irradiated by ultraviolet light, the nanometer titanium dioxide film has super-hydrophilic property and photocatalytic property, thus, the self-cleaning effect is realized. The novel nanometer titanium dioxide self-cleaning fluorine-carbon aluminum single sheet related in the invention has the following advantages: (1) the thickness of the titanium dioxide film is uniform, nanometer titanium dioxide crystal particles are uniformly distributed, and the titanium dioxide film has super-hydrophilic property and a better self-cleaning function; (2) the film has photocatalytic property, so that residual organic pollutants on the surface of the film can be decomposed, and the self-cleaning effect is further improved; and (3) the original performances, such as weatherproof performance, chemical corrosion resistance and the like, of the fluorine-carbon aluminum single sheet are retained.

The invention provides a preparation method and application of a silver/zinc oxide composite material, and relates to the technical field of preparation and application of zinc oxide photocatalysts. Zinc acetate, silver nitrate, L-aspartic acid, diethanol amine and deionized water are uniformly mixed and then placed into a reaction kettle for hydrothermal reaction, and the product is washed and dried to obtain the silver/zinc oxide composite material. It is found that the effect of the silver/zinc oxide composite material is much better than that of zinc oxide through photocatalytic experiments of methyl orange and rhodamine B. It is found that rodlike zinc oxide can be assembled into a rule body better, change the distribution of electric charge of the surface of the zinc oxide, and improve photo-induced electron space of the zinc oxide after Ag loading through tests of a scanning electron microscope, an X-ray diffraction spectrogram, an ultraviolet-visible absorption spectrogram andthe like, the comparison with a microstructure of the zinc oxide and the analysis of ZnO and Ag/ZnO from a growth mechanism and a photocatalytic mechanism. In general, Ag loading has a good effect onthe performance improvement of the zinc oxide.

The invention relates to a hydrothermal synthesis method for a metal organic frame with photocatalytic performance, and belongs to the technical field of preparation of environmental-friendly materials. The hydrothermal synthesis method comprises the following steps: according to the substance ratio of 1:1:4, respectively weighing didpyridine[3,2-a:2',3'-c]henazine-2-dicarboxylic acid, phosphotungstic acid and chromic chloride hexahydrate solids; transferring three solids in the step (A) into a flask, adding deionized water for dissolving, and agitating for ten minutes so as to be fully mixed; transferring the mixture in the step (B) into a reaction kettle for performing hydrothermal reaction; after the hydrothermal reaction is completed, naturally cooling to room temperature, washing with deionized water, and drying to obtain organic columnar crystals, namely photocatalyst [Co2(HDPPZC)4(Cl)2(H2O)2](PW<12>O<40>).7H2O. According to the hydrothermal synthesis method, a well crystallized product can be directly obtained by adopting intermediate-temperature liquid phase control, high-temperature calcination and crystallization are not required, and the energy consumption is relatively low.

The invention discloses an attapulgite-graphite-like-phased carbon nitride-poly(vinylidene fluoride) nanometer composite ultrafiltration membrane and a preparing method thereof. Through simultaneously introducing an attapulgite-graphite-like-phased carbon nitride composite material into the main body, the external surface and the internal surface of a poly(vinylidene fluoride) hollow fiber ultrafiltration membrane, a three-dimensional network structure formed by a unique nanometer fiber structure of attapulgite and poly(vinylidene fluoride) can be utilized to effectively improve the structure and strength of the poly(vinylidene fluoride) ultrafiltration membrane and to enhance a membrane densification property; high hydrophilicity of the attapulgite is utilized to improve permeability and hydrophilicity of the membrane; and more importantly, photocatalytic performance of graphite-like-phased carbon nitride on the internal and external surfaces and in the main body of the ultrafiltration membrane is utilized to achieve anti-pollution and self-cleaning functions of the membrane and to increase the economical efficiency of a membrane separating process.

The invention discloses an activated carbon biological turntable coupled artificial wetland system. The system comprises an activated carbon biological turntable and a vertical flow artificial wetlandwhich are sequentially connected in series; the activated carbon biological turntable takes a net-shaped polypropylene disk as a carrier, and the surface of the turntable is loaded with flake-shapedactivated carbon; a water inlet chamber, a water treatment chamber and a water outlet chamber are sequentially arranged in a pool body of the vertical flow artificial wetland from left to right, a gravel layer, a ceramsite layer and a photocatalytic filler layer are sequentially laid in the water treatment chamber from bottom to top, aquatic plants are planted, and the photocatalytic filler layeris formed by loading a barium titanate/cerium oxide composite material on coarse sand. The activated carbon biological turntable coupled artificial wetland system is put forward, in combination with photocatalytic properties of barium titanate and the high adsorptivity and stability of cerium oxide, the adsorption and degradation of pollutants in water can be significantly improved, and the systemhas the advantages of recycling, harmless treatment, high purification efficiency and large sewage treatment capacity and can be applied to purification treatment of urban black and odorous water.

The invention relates to the technical field of carbon quantum dot and cellulose conversion, and particularly discloses an acidic carbon quantum dot, a preparation method and application thereof. Thepreparation method comprises the following steps of: mixing aromatic amino acid and strong protonic acid for reaction to generate a eutectic solvent; and carrying out hydrothermal reaction on the eutectic solvent and water to obtain the acidic carbon quantum dot. The preparation method provided by the invention is green and environment-friendly, and low in cost, the obtained acidic carbon quantumdot has characteristics of uniform particle size, good dispersibility and high catalytic activity, and contains a large amount of aromatic ring structures, active amino groups and strong acidic functional groups on the surface, so that the carbon quantum dot has excellent catalytic property while having strong acidity, cellulose can be directly converted into furfural, and efficient conversion ofcellulose into furfural is achieved.

The invention discloses a method for preparing a photocatalyst from camellia shells for heavy metal polluted wastewater treatment. The method comprises the following steps: activating, carbonizing, crushing and sieving the camellia shells to obtain a camellia shell adsorption material; placing the camellia shell adsorption material in wastewater to purify heavy metal polluted wastewater; reactingthe camellia shell adsorption material with heavy metal ions adsorbed with sulfur-containing and selenium-containing agents to obtain metal sulfide and metal selenide with photocatalytic performance,and performing hydrothermal synthesis to prepare the carbon-based photocatalyst. The photocatalyst can accelerate degradation of organic compounds under light. The invention provides a new method forpurifying the heavy metal polluted wastewater and recycling the heavy metal adsorption material to prepare the carbon-based photocatalyst, reutilization of waste resources is fully realized, and the method is economical and environmentally friendly.

The invention discloses a preparation method and an application of nano-limited-range photocatalytic hydrogel. According to the method, catalyst nano-particles modified by organic compounds serve as across-linking agent, and radical polymerization is implemented to form nano-composite hydrogel with uniform network structure in the presence of initiators, polymerizable monomers and catalysts. Graphene oxide is added in the polymerization process of the hydrogel, so that recombination of photogenerated electron-holes is reduced, and a rigid framework is introduced to control soluble inflation of the hydrogel in the catalytic process. The hydrogel is placed into photosensitizer and sacrificial agent water solution and can efficiently generate hydrogen under irradiating of visible light.

The present invention relates to an in-situ surface-enhanced Raman spectroscopy system and the application thereof. The system comprises a Pt wire served as a counter electrode, an electrolytic cell body internally provided with a disc space for placing a working electrode and containing a solution, the working electrode disposed in the disc space, a reference switching port in communication with the electrolytic cell body and used for placing a reference electrode, a Pt wire lead connected with the working electrode, an electrolytic cell lid covered above the electrolytic cell body, and an electrolytic cell base used for fixing the working electrode and the electrolytic cell body. The electrolytic cell base is connected with the lower part of the electrolytic cell body, so that the working electrode and the counter electrode are in contact with each other. Compared with the prior art, the system is rapid in detection, low in cost and simple in preparation. Based on the system, the degradation process of p-nitro aniline as an organic pollutant is studied at the molecular level. Therefore, the in-situ rapid detection of intermediate products during the degradation process of p-nitro aniline as the organic pollutant is enabled.

The invention discloses a galvanized steel plate with a visible light-responsive photocatalytic coating on the surface and a manufacturing method thereof, and belongs to the field of new building materials. The galvanized steel plate comprises a galvanized steel plate body, a passivation film and a photocatalytic coating. According to the galvanized steel plate, at least one surface of the galvanized steel plate body is coated with the passivation film, and the nitrogen-doped modified photocatalytic coating is laminated on the passivation film; the passivation film can protect the galvanized steel plate from being corroded; the photocatalytic coating can remove organic matters and nitric oxide from air under visible light response, so that the service life of the galvanized steel plate isprolonged, and an effect of purifying the air is achieved.