70results about How to "Excellent visible light catalytic activity" patented technology

The invention discloses visible light catalyst of one dimension nanometer structure TiO₂ adulterated with non-metal N, which is prepared with the following method: (1) with hydro-thermal method, nanometer TiO₂ powder, TiO₂ colloid or Ti(OH)₄ and alkaline solution is mixed to form mixed suspension for water-thermal reaction; (2) after water-thermal reaction is finished, cooling is adopted, sediment is filtered and cleaned, and then white hydrogen titanium acid is realized; (3) hydrogen titanium acid, doping nitrogen source and water is mixed to form mixed suspension, ultrasound treatment is conducted after stirring, and then uniform mixture of hydrogen titanium acid and doping nitrogen source is realized after drying; (4) uniform mixture of hydrogen titanium acid and doping nitrogen source is calcinated and then visible light catalyst of one dimension nanometer structure TiO₂ adulterated with non-metal N is realized. Catalyst provided by the invention has one dimension structure and lavish active point position and can accelerate mass transfer of pollutant to catalyst, and therefore photocatalysis rate is improved; special one dimension structure and non-nitrogen metal adulteration of the invention lead to good visible-light catalytic activity.

The invention provides preparation of a carnation-shaped p-n heterojunction copper sulfide nanometer material, and belongs to the technical field of nanometer materials. The preparation includes the steps that melamine is used as a raw material, carbon-doped graphene carbon nitrogen C-g-C3N4(CCN) is synthesized through hydro-thermal treatment and high-temperature calcination, and the carbon-doped graphene carbon nitrogen, copper chloride dihydrate and thiourea are further subjected to a hydrothermal reaction to synthesize a CCN-CuS p-n heterojunction; the p-n heterostructure reduces charge transfer resistance, enables photoinduced charges to be effectively separated and can effectively improve activity of photocatalyst. It is indicated through experiments that the prepared CCN-CuS p-n heterojunction nanometer material shows excellent visible-light catalytic activity and good cycling stability, and the degradation rate of rhodamin B can reach 92.6%. Therefore, the nanometer material can be used for degradation treatment on organic dyestuff waste water.

The invention discloses a method for preparing a nuclear-shell-structured rutile monocrystal titanium dioxide nanowire array with a surface-cladding carbon layer, and the method is characterized by comprising the following steps: (a) immersing a rutile monocrystal titanium dioxide nanowire array into a phenol aqueous solution or an aqueous solution of phenol and a precious metal salt, preparing arutile monocrystal titanium dioxide nanowire array with a surface-cladding polyphenol compound by using a photochemical reaction method, then taking out the rutile monocrystal titanium dioxide nanowire array with the surface-cladding polyphenol compound, washing with water, and drying; and (b) carrying out high-temperature pyrolysis on the rutile monocrystal titanium dioxide nanowire array with the surface-cladding polyphenol compound in the presence of inert gas to obtain the nuclear-shell-structured rutile monocrystal titanium dioxide nanowire array with the surface-cladding carbon layer. By means of the preparation method disclosed by the invention, clean and pollution-free solar energy can be fully utilized so as to effectively reduce the energy consumption for production and the production cost. The prepared nuclear-shell-structured rutile monocrystal titanium dioxide nanowire array with the surface-cladding carbon layer not only has stable and efficient photocatalytic activity, but also can achieve wide-spectrum response to visible light so as to obviously improve the photo quantum yield of the titanium dioxide nanowire array and improve the solar utilization rate, and can be widely applied to the fields of hydrogen production through photodecomposition of water, pollutant degradation through photocatalysis and the like.

The invention relates to a C3N4/SiO2 heterojunction photocatalyst and a preparation method thereof. The method comprises the following steps that 2 g of melamine and a certain mass of nanosilicon dioxide are weighed; 10 ml of deionized water is added into the mixture; ultrasonic dispersion is performed for 4 h; the obtained suspension is stirred at the temperature of 90 DEG C for 12 h; then, the obtained solid is heated to 540 DEG C at the heating speed of 4 DEG C per min; the temperature is kept constant for 4 h; after natural cooling, the C3N4/SiO2 heterojunction photocatalyst is obtained. The C3N4/SiO2 heterojunction photocatalyst has the excellent organic pollutant degradation performance under visible light. According to the preparation method, the raw materials are cheap, and the method is simple, so that the product cost is effectively lowered, the visible light absorption range is enlarged due to composition of C3N4 and SiO2, the sunlight utilization rate is increased, and the high practical value and application prospect are achieved.

The invention relates to a Co3O4/In2O3 heterostructure nanotube and a preparation method and application thereof. The nanotube is prepared from Co3O4 nanoparticles and In2O3 nanoparticles, wherein the particle size of the Co3O4 nanoparticles and the In2O3 nanoparticles is 10-20nm; the diameter of the nanotube is 100-200nm, and the wall thickness of the nanotube is 10-50nm. The Co3O4/In2O3 heterostructure nanotube disclosed by the invention is of a hollow tubular structure and has good visible-light catalysis activity; under the irradiation of visible light, the Co3O4/In2O3 heterostructure nanotube is used for photocatalytic oxidation degradation of methyl orange, and the degradation ratio within 3 hours can reach 95%; the preparation method is simple in step and low in cost, and the tube wall thickness of the nanotube is easy to control.

The invention provides a high-stability TiO2 nanobelt-RGO-porous carbonitride composite photocatalyst, and a preparation method thereof. The preparation method comprises following steps: firstly, 0.2to 10g of P25 is weighed, and is added into 10 to 50ml of a 10M NaOH solution, stirring is carried out for 0.5 to 1h, at 200 to 600rpm stirring conditions, hydro-thermal reaction is carried out for 24to 72h at 120 to 180 DEG C, cooling is carried out, washing with 1 to 3M HCl is carried out for 0.5 to 1h, washing with water is carried out for 3 to 5 times until pH value is 7, drying is carried out for 12 to 24h at 50 to 80 DEG C so obtain TiO2 nanobelt; then 1 to 10ml of 2mg/ml oxidized graphene solution is added into 20 to 29ml of a mixed solvent of water and ethanol (V water : V ethanol=2:1), ultrasonic treatment is carried out for 0.5 to 1h, stirring is carried out and 0.1 to 0.5g of the TiO2 nanobelt is added, ultrasonic treatment is carried out for 5 to 20min, stirring is carried outfor 1 to 3h, hydro-thermal reaction is carried out for 5 to 10h at 150 to 250 DEG C, cooling and centrifugation are carried out, water washing is carried out for 3 to 5 times, drying is carried out for 12 to 24h at 50 to 80 DEG C to obtain TiO2 nanobelt-RGO; 5 to 10g of urea is subjected to roasting for 1 to 4h at 400 to 600 DEG C with 0.5 to 1.2ml/min nitrogen gas introduction, grinding is carried out to obtain Pg-C3N4; and at last, 0.02 to 0.5g of TiO2 nanobelt-RGO and 0.1 to 0.3g Pg-C3N4 are weighed and grinded to be uniform, and roasting is carried out for 1 to 4h at 400 to 600 DEG C with0.5 to 1.2ml/min nitrogen gas introduction to prepare the TiO2 nanobelt-RGO-Pg-C3N4.

The invention relates to the technical field of inorganic nano material science, in particular to a method for preparing a Magneli-phase titanium oxide mesoporous surface. The method comprises the steps: immersing a titanium substrate as an anode in an electrolyte, then applying a certain voltage between a cathode and the anode, performing cathodic glow discharge in the electrolyte so as to generate plasma, electrolyzing water through the plasma so as to generate hydrogen atoms and high-energy electrons, performing in situ hydrogenation reduction treatment on substances near the plasma, and inducing Mgeneli-phase titanium oxide mesopores to grow gradually out on the surface of the titanium substrate under the action of a synergistic effect of plasma reduction treatment and an anodic oxidation reaction, wherein after a specified discharge time is finished, a gray Mgeneli-phase titanium oxide mesoporous layer is formed on the surface of the titanium substrate of a certain thickness so asto obtain the Magneli-phase titanium oxide mesoporous surface. Induced growth of the Magneli-phase titanium oxide mesoporous structure is achieved on the surface of the titanium substrate through theaction of a synergistic effect of plasma reduction treatment and an anodic oxidation reaction.

The invention discloses a high visible-light catalytic activity material for a BiOCl/ZnO heterojunction and a preparation method thereof. The method comprises the steps of (1) preparing a solution A;(2) preparing a solution B; (3) mixing the solution A and the solution B to prepare into mixed liquor C; (4) dropwise adding a hexamethylenetetramine water solution into the mixed liquor C to obtain aflower-shaped BiOCl crystal; (5) respectively dissolving zinc acetate hexahydrate and hexamethylenetetramine into different deionized water to prepare into a solution I and a solution II; (6) mixingthe solution I and the solution II to form mixed liquor III; (7) uniformly mixing the mixed liquor III and BiOCl micro powder, reacting for 6 hours at 80 DEG C to 100 DEG C, naturally cooling after reaction, and washing, drying, cooling and grinding a product to obtain the high visible-light catalytic activity material for the BiOCl/ZnO heterojunction. The method is short in reaction time, mild inreaction condition and simple to operate. The BiOCl/ZnO heterojunction prepared through the method can absorb visible light, has photocatalytic activity of degrading rhodamine B under visible light,and has the characteristic of good photochemical stability.

The invention belongs to a practical technology in the field of environmental engineering and provides a manufacturing method of a biological carbon based on titanium dioxide photoactive (multilayered graphene/titanium dioxide) material. The environment-friendly type photocatalytic material with visible light activity is prepared through mainly taking waste animal feather, tetrabutyl titanate, absolute ethyl alcohol, potassium hydroxide and the like as raw materials, utilizing mutual effects of the materials at high temperature and carrying out an integrated heating, cross-linking and carbonization process. A preparation process accords with principles of simplicity, rapidness, greenness and high efficiency; the preparation cost of similar materials is greatly reduced. The prepared novel material has no toxin and harm, is convenient to recycle and has high catalytic efficiency and meets process and engineering requirements of water treatment.

The invention relates to doped and grafted nano TiO2 with the visible-light catalytic activity and a preparation method of the doped and grafted nano TiO2. The preparation method of the doped and grafted nano TiO2 comprises the following steps: firstly adding a dopant solution into TiCl4 solution, uniformly stirring and adjusting the pH value of the solution by ammonia water solution to generate sediment, filtering and washing the sediment until no chloridion is detected, then dispersing the sediment in deionized water, subsequently adding H2O2, uniformly stirring, heating and reflowing to obtain a doped nano TiO2 solution; then adding metal salt, heating and stirring, filtering, washing and drying the sediment to obtain the product. The doped and grafted nano TiO2 prepared by the method is capable of quickly degrading dyes such as methylene blue, has the remarkable visible-light catalytic activity and is mild in preparation condition, simple in preparation method and low in cost, and can be widely applied to fields of sewage treatment, antibacterial coatings, self-cleaning and the like.

The invention discloses a three-dimensional ordered macroporous (3DOM) BiVO4 loaded AgBr and Pd photocatalyst, preparation and application, belonging to the technical field of visible light response catalysts. A novel 3DOM BiVO4 loaded AgBr substance and Pd efficient visible light response nano hybridization photocatalyst is prepared by taking a 3DOM BiVO4 photocatalysis material as a carrier, adopting a PMMA microsphere hard template method, a low-temperature deposition-sedimentation method and a bubbling reduction method. The catalyst has a 3DOM structure, heterojunction and gradient structure surface as well as plasma resonance effect; AgBr is uniformly spread on the surface of a BiVO4 carrier; Pd is attached to the surface of the 3DOM structure in a nanocluster mode, and the specific surface area is 16m<2>/g, and the band gap energy is 2.49eV; the catalyst shows efficient visible light catalytic activity to degradation of parachlorophenol under the irradiation of visible light, and 4-CP is basically degraded completely after 150 minutes.

The invention discloses a graphene composite comprising nitrogen-doped reduced graphene oxide and nitrogen-doped titanium dioxide nanowires, wherein the length-diameter ratio of the titanium dioxide nanowires is larger than 10. The one-dimensional titanium dioxide nanowires are selected as an active component, have better electronic transmission channels and are beneficial to acceleration of electronic transmission and increase of the reaction rate. Meanwhile, the one-dimensional titanium dioxide nanowires can better prevent stacking of graphene sheets, more effectively use the characteristic of large specific surface of graphene, enlarge the reaction contact area and increase the catalytic reaction rate. A preparation method of the graphene composite adopts a simple process, raw materials are easy to store, the reaction is mild, energy consumption is lower, and the method is suitable for industrial application. Meanwhile, the titanium dioxide nanowires with controllable morphology are prepared firstly, then the graphene composite is prepared, the product cost is reduced effectively, and product quality controllability can be realized.

The invention discloses a photocatalyst of an ordered mesoporous polymer loading with metal phthalocyanine and a preparation method of the photocatalyst, belonging to the technical field of chemical catalysts and synthesis of the chemical catalysts. The photocatalyst of the ordered mesoporous polymer loading with metal phthalocyanine is composed of a carrier and metal phthalocyanine loaded on the carrier; and the carrier is a chloromethylation FDU-type ordered mesoporous polymer prepared through a chloromethylation functional reaction, wherein the weight percent of metal phthalocyanine in the photocatalyst of the ordered mesoporous polymer loading with metal phthalocyanine is 0.2-1.2; and the rest is the chloromethylation FDU-type ordered mesoporous polymer. According to the invention, the photocatalyst has double functions of absorbing and photo-catalyzing, and possesses advantages of the ordered mesoporous polymer and the metal phthalocyanine; the metal phthalocyanine molecules are restricted in highly ordered mesoporous channels and in a monomolecular dispersing state; therefore, the aggregation of the metal phthalocyanine molecules is inhibited; and the photocatalytic activity of the metal phthalocyanine molecules is improved.

The invention discloses a Bi4V2O11/g-C3N4 heterojunction photocatalyst and a preparation method and application thereof. The Bi4V2O11/g-C3N4 heterojunction photocatalyst comprises Bi4V2O11 and g-C3N4,and the Bi4V2O11 accounts for 0.01-50% of the total weight of the Bi4V2O11/g-C3N4 heterojunction photocatalyst. The preparation method of the catalyst comprises the following steps: dissolving a formula amount of g-C3N4 powder with ethylene glycol to obtain a g-C3N4 solution; then adding bismuth nitrate and ammonium vanadate, and stirring to obtain a uniform solution; transferring the solution into an autoclave for heat treatment to obtain a product, and washing and drying the product to obtain the Bi4V2O11/g-C3N4 heterojunction photocatalyst. Bi4V2O11 accounts for 0.01%-50% of the total weight of the catalyst, wherein the molar ratio of the bismuth element to the vanadium element is 1.5-2.5: 1. The photocatalyst has excellent photocatalytic activity, excellent CO2 catalytic reduction performance and long catalytic life. The process is simple, and cost is low.

The invention discloses a photocatalysis reaction device for treating rose red B high-salt wastewater and a process. Thephotocatalysis reaction device comprises a transparent shell, wherein the transparent shell is internally provided with an aerator; a light focusing membrane is arranged below the aerator. By adopting the process, rose red B high-salt wastewater is treated by using the photocatalysis reaction device. The photocatalysis reaction device disclosed by the invention has the advantages of being simple in structure, low in cost, high in light source utilization rate, wide in application range, and the like, can be widely applied to treatment on rose red B high-salt wastewater, is capable of achieving effective degradation of rose red B in high-salt wastewater, and has high use values and good application prospects. The process for treating the rose red B high-salt wastewater by using the photocatalysis reaction device, which is disclosed by the invention, has the advantagesof being simple in process, good in treatment effect, good in universality and the like, is capable of achieving efficient removal of the rose red B in the high-salt wastewater, and has great significances for effective treatment on the rose red B in the high-salt wastewater.

The invention discloses an advanced treatment method for electroplating wastewater. The advanced treatment method comprises the following steps: step 1, pretreatment; step 2, coagulating sedimentation; step 3, electrochemical-photocatalysis-ozone synergistic treatment; step 4, treatment by a cation exchange resin column; step 5, treatment in a biological aerated filter; and step 6, nanofiltrationand reverse osmosis treatment. The process steps are matched with one another, the layout is compact, the floor area is small, and the energy consumption is low. Oil is removed through pretreatment, suspended matters, cyanides and colloids are removed through coagulating sedimentation, nitrogen and phosphorus can be removed through electrochemical-photocatalysis-ozone synergy, organic contaminantsare thoroughly removed, most heavy metal ions are removed through treatment by the cation exchange resin column, the biological aerated filter is capable of remarkably improving water quality, reducing the workload of a subsequent membrane system and removing residual trace organic pollutants and heavy metal ions, and finally desalination is carried out by virtue of nanofiltration and a two-stagereverse osmosis system, so that the effluent quality meets the electroplating wastewater discharge standard GB21900-2008.

The invention relates to a Bi2O2CO3-Bi(OHC2O4).2H2O heterojunction and a preparation method and application thereof. The method comprises the following steps: (1) dissolving a bismuth salt in water; (2) adding aqueous solution of sodium oxalate into bismuth nitrate solution; (3) reacting at a certain temperature for a certain time; (4) cooling; (5) washing and drying; (6) dissolving a proper amount of precursor, a surfactant and carbonate in a certain amount of water; (7) adding a certain amount of bismuth salt; (8) cooling; and (9) washing and drying, thereby obtaining the Bi2O2CO3-Bi(OHC2O4).2H2O heterojunction. The one-dimensional Bi2O2CO3-Bi(OHC2O4).2H2O heterojunction is synthesized, and the performances of catalysis and adsorption are integrated into a whole. The catalyst has an excellent visible light catalytic degradation effect on high-concentration dye rhodamine B (RhB) and has high optical stability and reusability. More important, the Bi2O2CO3-Bi(OHC2O4).2H2O heterojunction has good adsorption function on the dye rhodamine B (RhB) and methylene blue (MB) in a short time (within 5 minutes), and also has excellent adsorption performance on the dye methyl orange (MO). The saturated adsorption amount of 40mg of Bi2O2CO3-Bi(OHC2O4).2H2O nanometer composite material on MO is 94mg/g, the MO can be desorbed by adding ethanol to wash, and the adsorbent can be repeatedly used.

The invention relates to a preparation method of a photocatalytic net loaded with carbon nitride, and belongs to the technical field of photocatalyst preparation. The preparation method comprises thesteps: mixing an inorganic adhesive with ultrathin carbon nitride powder, carrying out ultrasonic treatment, spraying the mixed solution of ultrathin carbon nitride and the adhesive onto a cotton fiber net, and waiting for drying to obtain the photocatalytic net loaded with carbon nitride. The carbon nitride photocatalyst is loaded on the cotton fiber net by using the adhesive, so that the problemof immobilization of a powder catalyst is solved; and meanwhile, the photocatalytic net has a relatively good treatment effect when being applied to the aspect of water treatment. The method is simple in process and low in cost, is suitable for the field of water treatment, and has certain application prospect and use value.