306results about How to "Improve photocatalytic effect" patented technology

The invention relates to a process for preparing diatom earth loading nanometer Ti2O material for purifying water and air, which belongs to the field of material process and environmental treatment. Diatom earth raw ore is filled with water and is churned and scattered, is screened, is sunken by gravity, and is eccentrically sunken, sulfuric acid is adopted to dissolve clay-type foreign matters which are left in pore passages after ores which mutually grow with diatom earth like quartz, feldspar, mica, and clay and the like and organic matters which are mixed such as grass roots and barks and the like are removed, and diatom fine soil is attained. Further, diatom fine soil is filtered, dried, and baked, and diatom fine soil after baked is filled with water, and is churned, and is filled with acid to regulate the PH value, and is filled TiCl4 solution, and is filled with ammonia sulfate solution to proceed hydrolytic decomposition deposition reaction, and product yield after the reaction is filtered, washed, dried, and baked to attain the nanometer Ti2O material.

The invention relates to a class of titanium dioxide photocatalysts, in particular to a low-temperature preparation method of visible light-responsive titanium dioxide transparent aqueous sol doped with metal ions. The titanium inorganic salt and the metal inorganic salt as a dopant are dissolved in water together to form a mixed solution; wherein, the molar ratio of the metal ion in the metal inorganic salt as a dopant to the titanium ion in the titanium inorganic salt is 0.001~ 0.2; then dropwise add inorganic lye until the pH of the mixed solution is about 7-11 to obtain a composite titanic acid precipitate, wash the composite titanic acid precipitate with water and filter, then disperse with hydrogen peroxide aqueous solution, at a temperature of 50-100 Heating at ℃ for 1-24 hours to obtain a transparent aqueous sol of titanium dioxide doped with metal ions. The low-temperature preparation method of the metal ion-doped titanium dioxide transparent water-based sol avoids the problem of environmental pollution, and the obtained sol is transparent, neutral and water-based, and has good photocatalytic effect under visible light.

The present invention provides a g-CNQDs/GO composite photocatalysis material preparation method. The concrete scheme of the method comprises that graphite powder, urea and concentrated nitric acid are used as main raw materials, an electrostatic coupling method is used, and four steps such as oxidation of graphene, oxidation of graphite phase carbon nitride quantum dots, oxidation of protonated graphite phase carbon nitride quantum dots, and g-CNQDs/GO compounding are performed to prepare the graphite phase carbon nitride quantum dot/graphene oxide composite photocatalysis material. According to the present invention, the photocatalytic property test on the prepared composite photocatalysis material is performed with visible light ([lambda] is more than 420 nm), and the results of the degradation on rhodamine B, methyl orange and other organic dyes show that the composite photocatalyis material has the excellent photocatalytic performance under the visible light.

The invention provides a preparation method of a nano-composite fiber material. The preparation method includes the steps of (1), dispersing multiple functional nanoparticles into an organic solvent so as to form functional nanoparticle suspension; (2), providing a fusion-state organic polymer carrier material; (3), spraying the functional nanoparticle suspension on the fusion-state organic polymer carrier material so as to enable the functional nanoparticles to be attached to the surface of the fusion-state organic polymer carrier material; (4), curing a fusion-state organic polymer carrier material obtained from the step (3) so as to obtain the nano-composite fiber material. The invention further provides the nano-composite fiber material prepared by the preparation method. The nano-composite fiber material has the advantages that the functional nanoparticles can be effectively loaded on the organic polymer carrier material, so that high-capacity functional nanoparticle load can be achieved; the nano-composite fiber material can be applied to the environment-friendly fields of wastewater purification, air purification, bacterium resistance, disinfection and the like.

The invention discloses a lightweight high-strength water permeable brick with a photocatalysis effect. The lightweight high-strength water permeable brick comprises a reverse osmosis layer, a water permeable layer and a photocatalysis layer in sequential distribution from bottom to top. The photocatalysis layer is coated with a cement-based material with a photocatalysis property; the water permeable layer is formed by pouring of ceramsite-doped regenerated lightweight aggregate concrete; the reverse osmosis layer is also formed by pouring of ceramsite-doped regenerated lightweight aggregate concrete. The lightweight high-strength water permeable brick structurally comprises three layers, namely the photocatalysis layer, the water permeable layer and the reverse osmosis layer, from top to bottom, and each of the three layers has certain porosity. The photocatalysis layer is capable of effectively treating motor vehicle exhaust; the water permeable layer is effective in water drainage; the reverse osmosis layer is effective in reduction of influences of the heat island effect on the environment.

The invention discloses a nitrogen and sulfur-codoped graphene quantum dot and a preparation method thereof. The preparation method comprises the steps that after a precursor pyrene is mixed with 80-100 ml of fuming nitric acid, refluxing and stirring are performed, nitro functionalizing treatment is performed on the surfaces of pyrene grains, a reactant is taken out, filtered and deacidified, an appropriate amount of NaOH is added to regulate the PH value, dispersion treatment is performed by adopting 300-W ultrasonic waves, the reactant is transferred into a polytetrafluoroethylene tank for a hydrothermal reaction, and after natural cooling is performed, a reactant is taken out, filtered, dialyzed and then dried; after a graphene quantum dot is dissolved into an appropriate amount of deionized water, an appropriate amount of ammonia water is added according to the proportion of the reactant, uniform mixing is performed, the mixture and an appropriate amount of sublimed sulfur are fully mixed to be uniform through stirring, the mixture is transferred into a polytetrafluoroethylene tank, a hydrothermal reaction is performed for 24 h by keeping the temperature of 180 DEG C-200 DEG C, and after cooling is performed, a reactant is taken out, filtered and dialysed to obtain the nitrogen and sulfur-codoped graphene quantum dot. The preparation method is simple in synthesis process, high in yield and finished product rate, environmentally friendly, poisonless, few in impurity and capable of easily obtaining the raw materials.

The invention discloses a preparation method of a titanium dioxide nano hollow ball. The method comprises steps of: using Cu2O or CuO nano ball as a template; adding organic or inorganic titanium salt / ethanol solution into the Cu2O or CuO ethanol suspension; carrying out magnetic stirring, and adding 20mL of a mixed solution containing distilled water and ethanol in a volume ratio of 1-9:1 continuing to stir for 1h, centrifuging to separate the sample, washing the sample with ethanol, and adding ammonia water or an acid solution to etch and dissolve the template; carrying out centrifuge separation and washing to obtain an amorphous TiO2 nano hollow ball; carrying out follow-up heat treatment at 250-650 DEG C to obtain an anatase type of TiO2 nano hollow sphere with high degree of crystallization. The invention adopts a template method, and has advantages of simple preparation process, mild reaction conditions and no addition of any additive damaging the environment. The TiO2 nano hollow ball has uniform size, good dispersibility and large specific surface area, and has obvious catalytic effect as a photocatalyst.

The invention discloses a preparation method and applications of a carbon dot/graphite like phase carbon nitride composite photocatalyst. The preparation method comprises following steps: 1, carbon dots are prepared, wherein a glucose solution and an alkaline solution are subjected to mixing ultrasonic treatment so as to obtain a mixed solution, the pH value of the mixed solution is adjusted withhydrochloric acid to 6 to 8, absolute ethyl alcohol is added wit stirring, magnesium sulfate is added, stirring is carried out, an obtained mixture is allowed to stand, and is filtered so as to obtaina settled solution, the settled solution is heated to 50 to 100 DEG C until the color of the settled solution is changed and a solid substance is generated, the solid substance is filtered, and is grinded into powder so as to obtain carbon dots; 2, the carbon dots are mixed with melamine at a mass ratio of (0.01-5) : (1-100), and an obtained product is delivered into a muffle furnace for calcining at 200 to 700 DEG C so as to obtain the CDs/g-C3N4 composite photocatalyst. Carbon dots possess excellent up conversion properties, so that the CDs/g-C3N4 composite photocatalyst is capable of conversing absorbed light with long wave length into light with short wave length, increasing visible light utilization rate, and increasing photocatalytic activity.

The invention discloses a bismuth tungstate/titanium dioxide nanoribbon surface heterostructure photocatalyst with performance of carrying out full spectrum catalytic degradation on pollutants. The bismuth tungstate/titanium dioxide nanoribbon surface heterostructure photocatalyst is formed by a titanium dioxide nanoribbon and a bismuth tungstate nanosheet grown on the titanium dioxide nanoribbon in a liquid phase manner. A preparation method of the bismuth tungstate/titanium dioxide nanoribbon surface heterostructure photocatalyst comprises the following steps: mixing bismuth nitrate and the titanium dioxide nanoribbon and sufficiently dissolving the mixture into ethylene glycol; then dropwise adding sodium tungstate solution into the solution; placing the mixed solution into a hydrothermal kettle to react; washing precipitates by deionized water and ethanol; and performing heat preservation on the separated precipitates under the temperature condition of 80 DEG C plus and minus 1 DEG C to obtain the bismuth tungstate/titanium dioxide nanoribbon surface heterostructure photocatalyst. The method disclosed by the invention has a simple process; the obtained photocatalyst material has an excellent photocatalysis effect under ultraviolet light, visible light and near-infrared light and can rapidly perform photocatalysis and degradation on the organic pollutants; the utilization rate of the light-catalyzed reaction for the sunlight is greatly improved; and the utilization range of the sunlight is widened.

The invention provides a preparation method for a nanometer titanium dioxide-silicon dioxide composite photocatalyst with a core shell structure. The preparation method comprises the following steps: (1) preparing a nanometer titanium dioxide-carbon-silicon dioxide compound with a core shell structure; (2) arraying the nanometer titanium dioxide-carbon-silicon dioxide compound with the core shell structure on a prepreg so as to form a single-layer structure; (3) corroding the prepreg with the nanometer titanium dioxide-carbon-silicon dioxide compound by using steam of a corrosive agent to remove a part of silicon dioxide shells in the nanometer titanium dioxide-carbon-silicon dioxide compound so as to form openings; (4) subjecting the corroded nanometer titanium dioxide-carbon-silicon dioxide compound to high-temperature oxidation to remove interlayer carbon so as to obtain the nanometer titanium dioxide-silicon dioxide composite photocatalyst with the core shell structure. The invention also provides the nanometer titanium dioxide-silicon dioxide composite photocatalyst with the core shell structure prepared by using the method.

The invention discloses an amorphous plasma heterojunction nano TiO2 sol having high-efficiency visible light response as well as a preparation method and an application thereof. The amorphous plasma heterojunction nano TiO2 sol is formed by taking a heterojunction structural body formed by precious metals and nano TiO2, or other semiconductor-precious metals and nano TiO2 by chemical connection as nano particles, schottky junction generated by cooperation among precious metals and nano TiO2 or other semiconductor-precious metals and nano TiO2 is used for performing resonance effects with local surface plasma to obtain the excellent visible-light photocatalysis effect, and the problem of low visible-light utilization rate of common TiO2 photocatalysts can be solved.

The invention relate to a nm material modified latex coating for inside wall with environmental protection,comprises of the following components:water 18-24,dispersant 0.4-1.0;nm silicon dioxide powder 1.0-3.0;deposit barium sulfate 20-30;talcum powder 10-15;titanium dioxide 10-20;antifoaming agent 0.1-0.2;modified crylic acid 25-35;zinc oxide and titanium oxide compound finishing mixture 0.1-0.3;thickener 0.3-0.4; 0.15-0.30;and pH regulator. The modified crylic acid has the lowest temperature to form film being 0-5deg.C and glassifying temperature being 10-15deg.C, the coating contains 6 organic compound lower than 5g/l,is suitable for decoration and protection for inside wall.

The invention provides a silver sulfide/titanium dioxide nanobelt photocatalyst and a preparation method thereof. During the silver sulfide/titanium dioxide nanobelt photocatalyst preparation, firstly, a silver nitrate solution and titanium dioxide are fully dissolved into deionized water to prepare first mixed liquid; then, a sodium sulfide solution is added into the first mixed liquid; the mixture is fully stirred to prepare second mixed liquid; next, the second mixed liquid is put into a hydrothermal reaction kettle for preparing third mixed liquid; next, the third mixed liquid is filtered to obtain precipitates; finally, the precipitates obtained through separation are washed and are subjected to vacuum heat preservation to prepare the silver sulfide/titanium dioxide nanobelt photocatalyst. The prepared silver sulfide/titanium dioxide nanobelt photocatalyst has the advantages that the specific surface area is great; good sunlight full-wave band photocatalytic activity is realized; the utilization rate of light-catalyzed reaction on sunlight is improved; the utilization range of the sunlight is expanded.

The invention relates to a method for preparing a tourmaline/titanium oxide composite sol and its purposes. The mass percentage of raw materials and feeds is listed: titanate with 5-15%, anhydrous alcohol with 60-90%, organic acid with 3-13%, inorganic acid with 2-15%, deionized water with 0.5-1.5%, tourmaline with 0.001-3%, tombarthite with 0.0004-0.0008%, the total is 100%. The said titanate is one of the kinds such as methyl titanate, ethyl titanate, butyl titanate, titanic chloride and titanoxy sulfate. The said organic acid is one of the kinds such as acetic acid, oxalic acid, formic acid and monosulfonic acid. The said inorganic acid is one of the kinds such as concentrated sulfuric acid, concentrated nitric acid and concentrated chlorhydric acid. The said tourmaline is one or more of the kinds such as iron-tourmaline, elbaite and dravite. The said tombarthite is one of the kinds such as lanthanum, europium nitrate, erbium nitrate, cerous nitrate and neodymium nitrate. The invention also provides the method for preparation of the said sol and its main purposes.

The invention discloses a method for preparing a novel porous honeycomb mesoporous titanium dioxide material, which relates to a method for preparing a mesoporous titanium dioxide material, and belongs to the technical field of a titanium dioxide photocatalyst. Organic acid and alcohol and an inorganic titanium source of C2-C9, and organic acid and an organic titanium source of C2-C9 are used as the raw materials in the method. The method comprises the following steps: uniformly mixing the organic acid and the titanium source in the molar ratio of 1-10:1, reacting for 0.5-1.0h at the temperature of 10 DEG C-80 DEG C, and evaporating the solvent to obtain a honeycomb puffing solid; roasting for 1-5h at the temperature of 200-700 DEG C to obtain the porous honeycomb mesoporous titanium dioxide material. The invention has the advantages of easily obtained raw materials, simple preparation method, short preparation time, and no need of adding templates. The obtained mesoporous titanium dioxide has both visible pores and the mesopores, the distribution of pore diameters is narrow, the micropore diameter is 20-30nm, and the specific area is 90-160m<2>/g. The mesoporous titanium dioxide material has certain hardness, is easy to separate from liquid phase, can achieve good separation effect by decantation, has high photocatalytic activity, and is especially suitable for the fields of photocatalysis.

The invention discloses a preparation method of a titanium dioxide/polysiloxane photocatalytic composite film, which comprises the following steps: adding vinyl-terminated silicone oil, hydrogen-containing silicone oil and titanium sol into a film-forming solvent, uniformly mixing, adding a reinforcing agent silicon dioxide, uniformly mixing, adding a platinum catalyst to initiate silicon hydrogen addition reaction, pouring into a mold, and gradually forming the film along with the solvent volatilization and silicon hydrogen addition reaction, thereby obtaining the titanium dioxide/polysiloxane photocatalytic composite film. The method is simple in technique and easy to implement; the crosslinking level of the stereoscopic network structure of the composite film is controllable, and silicon dioxide granules can be uniformly and stably dispersed in the composite film in the form of primary particles and can be easily enriched and embedded in the surface layer of the composite film; and the composite film has the advantages of favorable mechanical strength and obvious ultraviolet shielding effect, has excellent photocatalytic functions of resisting bacteria, degrading organic substances and the like, and can be used in the fields of textiles, paints, buildings, cosmetics, sanitation, medicine and the like.

The invention relates to a titanium dioxide nano tube and a preparation method thereof. Commercially available titanium dioxide is adopted as a raw material, high-concentration sodium hydroxide is used as a raw material, the raw materials are processed at a high temperature for a period of time to obtain a sodium titanate midbody, then the midbody is separated from a high-concentration sodium hydroxide solution, the block-shaped midbody is slightly crushed and stirred and washed by acid solution, the midbody is converted to the form of titanic acid, and the titanic acid is heated to obtain the titanium dioxide nano tube. By adopting the method, the efficiency is high, the yield is high, the high temperature roasting is not needed, the alkaline liquid and acid liquid can be recycled, the high-efficient utilization of the resource can be realized, the low-carbon environment-friendly ecological concept can be satisfied, the prepared nano tube is excellent in performance, wider in absorption wavelength range, excellent in photo catalytic effect and capable of being widely used such as photo catalyst, lithium battery and the like.

The invention provides a preparation method of a surface molecular imprinting composite photocatalytic material and belongs to the technical field of environmental material preparation. The preparation method comprises the following steps: preparing g-C3N4 by use of high-temperature calcining, preparing Fe3O4/g-C3N4-loaded photocatalyst by use of a hydrothermal sedimentation technology, and performing polypyrrole modification on the Fe3O4/g-C3N4-loaded photocatalyst; and performing surface modification on the Fe3O4/g-C3N4-loaded photocatalyst by use of a surface molecular imprinting technology, thereby preparing a surface molecular imprinting PPy/Fe3O4/g-C3N4 composite photocatalytic material with relatively high catalytic activity. By virtue of the synergetic effect of PPy and g-C3N4, the photocatalytic effect is improved; furthermore, due to the excellent conduction performance of Fe3O4, the photocatalytic speed, the Fe3O4 magnetism and the surface molecular imprinting composite photocatalyst recycling are greatly improved, By virtue of introduction of the surface molecular imprinting technology, the purpose of selectively degrading target pollutants can be well realized, and the defect that a common photocatalyst can not selectively degrade the target pollutants can be overcome.

The invention provides a preparation method for a blue TiO2 catalyst. The preparation method for the blue TiO2 catalyst comprises the following steps that TiCl4 and hydrazine hydrate are mixed according to the molar ratio of 1: (5-10), and a TiCl4-hydrazine complex is obtained; deionized water is added into the complex according to the mass ratio of the TiCl4 and water of 1:15-30, and a TiO2 precursor body fluid is obtained; and the obtained precursor body fluid is put into a hydrothermal reactor and reacted for 16-24 hours at the temperature of 170-220 DEG C, and then, after suction filtration, washing and drying, the blue TiO2 catalyst is obtained. Through the preparation method for the blue TiO2 catalyst, the obtained blue TiO2 catalyst has a good ultraviolet-visual light response and a good photocatalytic wastewater dye degradation property under ultraviolet-visual light. A methyl orange solution of 20 mg/L can be completely degraded by blue TiO2 powder within 25 minutes, and the photocatalytic effect of the blue TiO2 powder is better than that of white TiO2.

The invention belongs to the technical field of structural-color material preparation, and discloses an amorphous photonic crystal structure-color material with a photocatalytic effect and a preparation method thereof. The method comprises the following steps: preparing a monodisperse silicon dioxide microsphere emulsion by adopting an improved method, and modifying the surfaces of silicon dioxidemicrospheres with ammonia water; and then, preparing SiO2@TiO2 nano microspheres with uniform particle sizes by adopting a mixed solvent method, and carrying out heat treatment under argon to obtainthe amorphous photonic crystal structure-color material with a photocatalysis function. Through introduction of oxygen defects, the nano microspheres can exhibit the characteristics that the amorphousdisordered photonic crystal structure color is high in saturation and does not fade. The shell layer formed by TiO2 nanocrystalline has high electron-hole separation rate, and the photocatalysis function is improved. The non-angle-dependent amorphous photonic crystal structure-color material with the photocatalytic property can replace conventional pigment in use, has double functions of degrading pollutants, and has a great application prospect in environment protection development in pigment industry.