61results about How to "Strong visible light absorption" patented technology

The invention mainly aims at providing a preparation method and application of a g-C3N4-Cu2O composite catalyst. The preparation method comprises the following steps: providing a first solution, wherein the first solution contains Cu<2+> in a dissolved state; adding protonated g-C3N4 into the first solution, stirring, and carrying out ultrasonic treatment to obtain suspension; adding xylitol into the suspension in a stirring state, adjusting the pH value to 10-12, and stirring to obtain mixed liquid; heating the mixed liquid to 150-200 DEG C in a high-pressure reaction container, and carrying out a reaction for 25-35h at the constant temperature to obtain reactants; cooling the reactants and then carrying out solid-liquid separation on the cooled reactants to obtain a solid product, cleaning, and carrying out vacuum drying; heating the solid product up to 150-250 DEG C under the condition of gas protection, and maintaining the constant temperature for 1-3h to obtain the g-C3N4-Cu2O composite catalyst. The g-C3N4-Cu2O composite catalyst has higher visible absorption capacity and good photocatalytic performance. The g-C3N4-Cu2O composite catalyst can be used for carrying out catalytic treatment on organic pollutants in waste water in presence of visible light, and is remarkable in degradation effect and relatively stable.

The invention belongs to the field of a semiconductor photocatalysis technology and specifically relates to a large-specific surface area graphite-phase carbonitride photocatalyst and its application in the photocatalytic degradation reaction of TCP and the photocatalysis reaction for hydrogen production. By a dielectric barrier discharge plasma generator, N2 is used as a discharge gas to discharge catalyst precursors such as melamine, dicyandiamide, urea and the like so as to carry out polycondensation on the precursors. The photocatalyst provided by the invention has advantages of simple operation, short consumed time, low energy consumption, high product catalyst activity, good stability and the like. As the catalyst prepared by the method has larger specific surface area, stronger visible light absorption capacity and higher electron-hole separating efficiency, the catalyst has strong catalytic degradation ability of organic pollutants and photocatalytic decomposition ability of water for hydrogen production under visible light illumination. The catalyst provided by the invention is used in the photocatalytic degradation process of TCP and the photocatalytic decomposition process of water for hydrogen production.

The invention discloses a preparation method of an Ag0.35V2O5/TiO2 nano-composite photocatalyst. The preparation method is characterized by comprising the following steps: (1) mixing and uniformly stirring 14 to 17 mass percent of tetrabutyl titanate, 5 to 7 mass percent of polyvinylpyrrolidone with the average molecular weight of 1300000, 20 to 25 mass percent of absolute ethyl alcohol, 10 to 15 mass percent of dimethylacetamide and 38 to 46 mass percent of glacial acetic acid to obtain polyvinylpyrrolidone/titanate solution which is marked as a solution A; (2) mixing and uniformly stirring 3 to 6 mass percent of bisacetylacetonate vanadium oxide, 0.5 to 1 mass percent of silver nitrate, 12 to 16 mass percent of polyvinylpyrrolidone with the average molecular weight of 1300000 and 79 to 84 mass percent of dimethylacetamide to obtain a solution B; (3) mixing and uniformly stirring the solution A and the solution B to obtain a mixed solution of polyvinylpyrrolidone/titanate/ bisacetylacetonate vanadium oxide/silver nitrate; (4) spinning the mixed solution to obtain nano-fiber primary material by an electrospinning method, and then annealing the nano-fiber primary material in an air atmosphere to obtain the Ag0.35V2O5/TiO2 nano-composite photocatalyst.

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 belongs to the technical field of photocatalytic materials, and discloses a platinum metal loaded carbon nitride film, and a preparation method and an application thereof. The preparation method provided by the invention comprises the following steps: S1, placing a carbon nitride precursor into a crucible, and placing a carrier above the crucible; S2, calcining the crucible of the step S1 so as to obtain a graphite-phase carbon nitride film loaded on the carrier; and S3, impregnating the graphite-phase carbon nitride film obtained in the step S2 into a platinum-containing compound solution, and carrying out reducing so as to obtain a platinum metal loaded graphite-phase carbon nitride film with high water flux. According to the invention, through high-temperature evaporationcoating to the carbon nitride precursor, carbon nitride is uniformly coated onto the carrier, wherein cyanoguanidine and 2,6-diaminopyridine are preferably selected to form a precursor; and through animpregnation-reduction method, platinum metal particles are loaded onto the surface of a carbon nitride film to obtain the carbon nitride film with high water flux, stronger visible-light absorptioncapability and excellent photocatalytic degradation activity to aniline sewage, wherein the carbon nitride film can completely degrade aniline in one hour.

The invention provides a method for preparing a PEG modified g-C3N4-Cu2O compound catalyst and an application thereof. The method comprises the following steps: preparing a first solution including dissolved Cu<2+> ions and PEG-400; adding protonated g-C3N4 into the first solution, stirring, and performing ultrasonic treatment to obtain a suspension liquid; adding xylitol into the suspension liquid under a stirring state, adjusting the pH value to 10-12, and stirring to obtain a mixed liquid; heating the mixed liquid to 150-200 DEG C in a high-pressure reaction container, reacting at constant temperature for 25-35 hours, and naturally cooling to obtain a reacting product; and separating solid and liquid of the cooled reacting product, washing, and drying in vacuum to obtain a solid product; and heating the solid product to 150-250 DEG C under the protection of an inert gas atmosphere, and keeping constant temperature for 1-3 hours to obtain the g-C3N4-Cu2O compound catalyst. The compound catalyst has stronger visible light absorbability, reinforced photocatalytic performance and reinforced stability.

The invention discloses a binuclear ruthenium-platinum complex and a preparation method and application thereof. The chemical formula of the binuclear ruthenium-platinum complex is shown in the description, wherein tmfppy is 2-(4-( trifluoromethyl) phenyl) pyridine, EPIP is 2[4-ethynylphenyl]-1H-imidazo[4,5-f][1,10]phenanthroline, and L is 2,2': 6', 2''-tris(4-tert-butyl) pyridine. The binuclear ruthenium-platinum complex can be used to prepare hydrogen gas by performing catalytic reduction of water under visible light irradiation in a mixed solution of acetone and water.

The invention relates to a hydro-thermal synthesis method for a molybdenum-sulphur co-doped mesoporous nano titanium dioxide visible-light-driven photocatalyst. The method comprises the following steps: preparing an ethylene glycol titaniumprecursor by adopting a known technical method in prior art, mixing the precursor, sodium molybdate, thiourea and water according to a certain ratio to prepare a solution, and implementing a simple hydro-thermal synthesis method to obtain the molybdenum-sulphur co-doped mesoporous nano titanium dioxide visible-light-driven photocatalyst. Shown from an XRD spectrogram, the prepared molybdenum-sulphur co-doped mesoporous nano titanium dioxide visible-light-driven photocatalyst is in a typical anatase structure and has the good crystallinity. The co-doping of molybdenum and sulphur can be proved by the XRD spectrogram. Visible-light-driven photocatalyzing results show that the molybdenum-sulphur co-doped mesoporous nano titanium dioxide visible-light-driven photocatalyst prepared by adopting the method disclosed by the invention has an excellent visible-light-driven photocatalyzing performance, can be used for effectively solving problems of environment pollution and the like, and has potential application prospects in fields of energy and the like.

The invention relates to a method for preparing a three-dimensional layered Ti-Fe alloy oxide photonic crystal electrode (Ti-Fe-O NTPC) with a high periodicity. The photonic crystal electrode is prepared by using ferrotitanium as a substrate and using a three-step electrochemical anodizing method. Compared with a conventional nanotube structure and a layered titanium dioxide nanotube without doped ferrum, the Ti-Fe-O NTPC novel electrode has high-efficient visible photoelectrocatalysis performance because the Ti-Fe-O NTPC has a high-periodicity ordered nanometer net which can be used as photonic crystal layer to increase light absorption and the use of the alloy substrate guarantees uniform doping of Fe and Ti at an atom level so as to promote electron transmission. The electrode has potential application value in the field of photocatalysis, photoelectrocatalysis, and new energy preparation and analysis detection.

The invention relates to graphene composite hydrogel and preparation and application thereof. The composite hydrogel comprises graphene and mesoporous carbon nanospheres. The preparation method comprises the steps of dispersing graphene oxide and mesoporous carbon nanospheres in water, carrying out ultrasonic treatment by using a probe until the graphene oxide and the mesoporous carbon nanospheresare uniformly dispersed to obtain a dispersion liquid, and adding a weak reducing agent for hydrothermal reaction. An all-solid-state supercapacitor assembly by the composite hydrogel is high in specific capacitance and volume energy density and good in flexibility, and the capacitance performance of the all-solid-state supercapacitor can be remarkably improved under the irradiation of sunlight.

The invention discloses a preparation method for nitrogen-doped anatase titanium dioxide. The preparation method is characterized by comprising the following steps that 7-10 parts of titanium nitride with the average particle size of 20-50 nm is placed into a muffle furnace, constant-temperature calcination is performed for 15-90 min at the temperature of 395 DEG C-405 DEG C, the temperature is decreased to the room temperature, and a first sample is obtained; the first sample is placed in the muffle furnace, constant-temperature calcinations is performed for 1-8 h at the temperature of 345 DEG C-355 DEG C, then the temperature is decreased to the room temperature, and a second sample, that is, the nitrogen-doped anatase titanium dioxide is obtained, and the second sample forms a 400-500-nm visible light absorption platform through second-time oxidizing calcination. The nitrogen-doped anatase titanium dioxide is applied to the fields of organic pollutant degradation, dye degradation, water photodecomposition and hydrogen production environment restoration.

The invention discloses a heterojunction titanium dioxide composite photo-catalyst and a preparation method thereof, and belongs to the technical field of photo-catalysis. The heterojunction titaniumdioxide composite photo-catalyst is carbon-doped titanium dioxide with a heterojunction structure, which is formed by calcining a titanium metal organic framework; the titanium dioxide with the heterojunction structure has an anatase crystal form and a rutile crystal form at the same time. The heterojunction titanium dioxide photo-composite catalyst is good in adsorption performance and high in pollutant photo-catalytic degradation efficiency.

The invention belongs to the technical field of preparation of crystal materials, and relates to an iron-doped titanium oxygen cluster material as well as a synthesis method and application thereof. The molecular formula of the iron-doped titanium oxygen cluster is Ti2Fe4 (mu3-O) (mu2-O) (OOCPh) 12 (C5H8O2) (CH3CN) 4, wherein OOCPh is benzoic acid, mu3-O represents a triplet O atom, and mu2-O represents a diplet O atom. The synthesis method comprises the following synthesis steps of: adding isopropyl titanate, ferric acetylacetonate, a benzoic acid ligand and an acetonitrile solvent into a reaction kettle; stirring the materials at room temperature for 1-2 hours; reacting at 100-120 DEG C for 72-120 hours; performing cooling; separating out crystals from the system; and performing separating, washing and drying to obtain the iron-doped titanium oxygen cluster. The iron-doped titanium oxygen cluster material prepared by the method has the advantages of narrow energy band gap, high stability, high catalytic activity and the like, and has a wide application prospect in the aspects of photodegradation of organic pollutants and the like.

The invention relates to a preparing method for the TiO2 visible light catalyst. The method is to make the titanium salt react with the ethanol to get the transparent liquid, drop the liquid into the deionized water to form the white suspension, adjust the pH value with the inorganic acid, and then process with the ultra sound in eighty to one hundred and sixty DEG C for five to twenty hours to get the TiO2 nanometer crystal sol; and then drop the ammonium bromide into the TiO2 nanometer crystal sol, implement circumfluent reaction for five to ten hours, then decompress and evaporate the solvent to get the dry gel, extract the dry gel taking the ethanol as the solvent, and dry in one hundred to one hundred and twenty DEG C to obtain the TiO2 visible light catalyst. The invention has the advantages of simple operation, gentle reaction condition, and low cost of device, strong visible light absorbing and good visible light catalyzing capability, etc.

The invention relates to the technical field of photocatalytic materials, in particular to a preparation method of a 2D/1D heterojunction photocatalyst and an application of the 2D/1D heterojunction photocatalyst in antibiosis, and the preparation method of the 2D/1D heterojunction photocatalyst comprises the following steps: synthesizing a 1D porous In2O3 nanotube as a support semiconductor by a simple calcination method; and performing in-situ growth of a 2D ultrathin ZnIn2S4 nanosheet on the surface of the 1D porous In2O3 nanotube through a low-temperature oil bath process so as to construct the efficient visible light driven 2D ZnIn2S4/1D In2O3 heterojunction photocatalyst which is used for inactivating pathogenic microorganisms. The method has the advantages that the method is simple and convenient, the cost is low, and the material prepared by the method has the advantages of accelerating the separation and migration rate of photon-generated carriers and the generation of active species such as superoxide radicals, and has excellent photocatalytic antibacterial activity.

The invention discloses a preparation method of a Zn-N compound doped titanium dioxide nanotube array membrane with visible light activity. According to the method, a pure titanium plate is utilized as a substrate, electrochemical anodizing technology is utilized, the pure titanium plate is utilized as a positive electrode, a platinum plate is utilized as a negative electrode, electrolyte is a mixed solution of NH4F, ethylene glycol and deionized water, anodizing is performed under 20V to 50V direct-current voltage, and the pure titanium plate and the platinum plate are taken out and naturallydried after the reaction finishes; a sample is immersed into a zinc chloride ethanol solution and taken out to be blown and dried; the dried sample is put into a tubular furnace, and the dried sampleis cooled after being calcined to obtain the Zn-N compound doped titanium dioxide nanotube array membrane. By means of the preparation method, zinc and nitrogen can be doped into titanium dioxide lattice at the same time, the side effects caused by zinc ions which are oxidized into metal oxide are overcome, forbidden bandwidth of prepared TiO2 is reduced, and visible light absorption capacity ofthe prepared TiO2 is enhanced. Furthermore, compared with the prior art, the preparation method disclosed by the invention has the advantages of simpleness in operation, low cost, high modifying effect, good industrial application prospect and the like.

The invention discloses an exfoliated tubular carbon nitride photocatalyst as well as a preparation method and application thereof. The preparation method of the exfoliated tubular carbon nitride photocatalyst comprises the following steps: mixing a nitrogen-containing raw material and potassium halide to prepare a mixed solution, and carrying out a hydrothermal reaction and calcination to prepare the exfoliated tubular carbon nitride photocatalyst. The exfoliated tubular carbon nitride photocatalyst prepared by the invention has the advantages of large specific surface area, multiple active sites, low photo-induced electron-hole pair recombination rate, strong visible light absorption ability, high photocatalytic activity and the like, is a novel visible light photocatalyst with novel morphology and structure and excellent photocatalytic performance, can be widely used for degrading organic pollutants and producing H2O2, and presents high practical application value; and meanwhile, the preparation method does not need additional templates, dangerous reagents or raw materials harmful to the environment, has the advantages of being simple in process, easy to operate, low in cost, high in safety, high in preparation efficiency and the like, and is suitable for large-scale preparation and beneficial to industrial application.

The invention discloses synthesis of a titanium dioxide porphyrin-based covalent organic framework composite material and application of the titanium dioxide porphyrin-based covalent organic framework composite material in hydrogen production by photocatalytic decomposition of water. The material has a certain benefits in the aspects of relieving energy crisis and developing sustainable clean energy as a substitute of fossil fuel. As a photocatalyst, TiO2 has the characteristics of no toxicity, low price, easiness in obtaining, proper oxidation-reduction potential, high light corrosion resistance, excellent chemical stability and the like. The covalent organic framework material is made of structurally diversified porous materials which are connected by covalent bonds and have high specific surface area, high porosity and high crystallinity, and has the characteristics of designability and easiness in functionalization. An inorganic semiconductor TiO2 and COFs with a large pi conjugated system and excellent chemical stability are combined by utilizing a post-modification strategy to form a composite catalyst, and the composite catalyst is applied to a photocatalytic water decomposition reaction and has innovative significance; and the material has great research and application potential in the field of photocatalysis.

The invention relates to a Ti-Au alloy nano-tube photonic crystal electrode with high periodicity and a construction method thereof. The photonic crystal electrode comprises TiO2 and Au which is uniformly doped in TiO2 crystal lattices, and is divided into upper and lower layers, wherein nano-pores are formed in the upper layer, and nano-tube arrays are arranged in the lower layer. The construction method comprises the following steps: (1) anodizing in a constant-temperature water bath by using a pre-treated Ti-Au alloy plate as an anode, a platinum gauze electrode as a counter electrode and an ethylene glycol solution containing fluoride and water as an anodizing electrolyte solution to obtain a nano-tube attached Ti-Au alloy plate; (2) carrying out ultrasonic treatment on the nano-tube attached Ti-Au alloy plate, and then continuously anodizing in the constant-temperature water bath to obtain an electrode sample; and (3) washing the electrode sample, soaking in ethanol, drying and heating to obtain a target product Ti-Au alloy nano-tube photonic crystal electrode. Compared with the prior art, the photonic crystal electrode has good photoelectrocatalysis performance, simple preparation process, low cost, high application value and the like.

The invention discloses a polythiophene-carbon nitride composite photocatalyst as well as a preparation method and application thereof. The polythiophene-carbon nitride composite photocatalyst comprises a carrier carbon nitride nanosheet and a loaded polythiophene nanosheet, and the preparation method of the polythiophene-carbon nitride composite photocatalyst comprises the following steps: 1) calcining melamine to prepare the carbon nitride nanosheet, and dispersing thiophene and an oxidizing agent in a solvent for polymerization reaction to prepare polythiophene; 2) dispersing polythiophene in a solvent to prepare a polythiophene dispersion liquid; and (3) dispersing the carbon nitride nanosheets in a solvent, dropwise adding the polythiophene dispersion liquid while stirring, carrying out constant-temperature reaction after the polythiophene dispersion liquid is added, separating out solids, washing and drying to obtain the polythiophene-carbon nitride composite photocatalyst. The polythiophene-carbon nitride composite photocatalyst has excellent photocatalytic performance, can be used as a catalyst for hydrogen peroxide production reaction, and is simple in preparation process, low in cost, high in controllability and suitable for large-scale production and application.

The invention discloses a photocatalytic sterilizing and mosquito repelling agent loaded with black titanium dioxide and a preparation method thereof. The sterilizing and mosquito repelling agent comprises the following raw material in parts by weight: 4-8 parts of black titanium dioxide, 15-20 parts of Chinese mugwort extract solution, 9-15 parts of perilla leaf extract solution, 13-17 parts of peppermint essential oil, 7-15 parts of aloe essential oil, 8-12 parts of essential oil emulsifiers and 25-32 parts of food grade ethanol. The photocatalytic sterilizing and mosquito repelling agent loaded with black TiO2(subscript) disclosed by the invention is simple in raw materials and preparation processes and low in cost; the high-efficiency and environment-friendly photocatalytic sterilizingand mosquito repelling agent is environment-friendly and healthy without adding any toxic chemicals, and has characteristics of strong mosquito repelling durability, excellent sterilizing performance, etc. Moreover, the preparation method of the invention is simple and easy to operate, and is not only suitable for laboratory preparation, but also suitable for large-scale production.