4884 results about "Photo catalysis" patented technology

The invention discloses a g-C3N4 nanosheet/CdS composite visible-light-driven photocatalyst and a preparing method and application thereof and belongs to the technical field of material preparation and photocatalysis. The catalyst is directly obtained with the solvothermal method by taking two-dimensional ultra-thin g-C3N4 nanosheets as the matrix, cadmium acetate dihydrate and thioacetamide as raw materials, and ethyl alcohol as the solvent. Compared with general block g-C3N4/CdS, the two-dimensional ultra-thin g-C3N4 nanosheet/CdS composite photocatalyst prepared with the method has the advantages that the two substances are in tighter contact, the specific surface area is larger, photon-generated electron-hole can be better separated, and photocatalytic efficiency is higher. Under the shining of sunlight, the composite photocatalyst enables catalytic degradation of organic pollutants such as methyl orange in water to be achieved well. The preparing method is easy, raw materials are easy to obtain, visible light catalysis efficiency is high, and the application prospect is wide in the photocatalysis field.

The invention discloses a high-efficiency graphene/silver phosphate composite visible light photocatalyst and a preparation method thereof, belonging to the technical field of composite materials and environmental management photocatalysis. The preparation method comprises the following steps: dissolving graphene oxide in water, and carrying out ultrasonic treatment to obtain a graphene oxide dispersed liquid; dissolving silver nitrate in deionized water, gradually and dropwisely adding into the graphene oxide dispersed liquid while stirring to obtain a mixed solution, uniformly stirring, and aging; dropwisely adding a prepared disodium hydrogen phosphate or sodium dihydrogen phosphate solution into the graphene oxide-silver nitrate mixed solution, continuing stirring, transferring into a hydrothermal reaction kettle, carrying out hydrothermal reaction, and cooling to room temperature; and washing the reaction product, and carrying out vacuum drying to obtain the visible light photocatalyst. The invention has the advantages of wide material sources and simple preparation process; and the obtained composite material has the advantages of controllable structure and regular pattern, and has high-efficiency degradation effect on organic dyes rhodamine B and methylene blue with certain concentration under the visible light irradiation.

The invention belongs to the technical field of new chemical materials and relates to a photocatalytic type self-repairing super-hydrophobic coating and a preparation method thereof. The coating comprises the following materials: 10-50 percent of thermoplastic film-forming resin, 5-20 percent of low-surface energy material, 1-10 percent of photocatalytic active nano particles, 5-40 percent of hydrophobicity nano particles and 20-60 percent of organic solvent. The preparation method comprises the following steps: firstly, allowing nano particles to be subjected to fluorosilane modification to obtain the hydrophobicity nano particles; then, weighing all components of the coating for mixing, and performing high-speed shearing dispersing to obtain the coating provided by the invention. The coating can be applied to the surfaces of base materials such as steel material, aluminium alloy, plastic and composite in the way of brushing, spraying and the like, and a lotus leaf type super-hydrophobic coating can be obtained through drying. The coating can realize super-hydrophobic self-repairing through UV irradiation after being polluted by organic pollutant or subjected to mechanical wear by external forces, so that the coating has extremely good super-hydrophobic performance and perdurability, and the long-term using performance under the outdoor environments is also ensured.

The invention discloses a copolymerization modified graphite-phase carbon nitride nanosheet visible-light-driven photocatalyst as well as a preparation method and an application thereof, and belongs to the technical field of material preparation and photocatalysis. The graphite-phase carbon nitride nanosheet visible-light-driven photocatalyst which adopts a nanosheet structure and synthesized with a copolymerization method is formed by taking urea and different small organic molecule monomers as precursors through the high-temperature copolymerization action. The prepared graphite-phase carbon nitride has a lower-dimension nanosheet microstructure and a proper band gap; compared with conventional bulk-phase carbon nitride, the graphite-phase carbon nitride effectively increases the specific surface area, enhances the utilization rate of sunlight, and has efficient photocatalysis hydrogen production performance in visible light. According to the copolymerization modified graphite-phase carbon nitride nanosheet visible-light-driven photocatalyst, the synthetic process is simple, the cost is low, the catalytic efficiency is high, the actual production requirements are met, and the photocatalyst has broad application prospects in the field of photocatalysis.

The invention relates to an omnidirectional antibacterial intelligent type air purifier for a vehicle, which comprises a shell, an air purification component, a fan power component, an energy component, an induction sensor component, a negative-ion generator and a display intelligent control component. The omnidirectional antibacterial intelligent type air purifier for the vehicle uses a nano silver modified titanium dioxide as a photocatalyst, thereby increasing photocatalysis effect and sterilization antibacterial performance. The omnidirectional antibacterial intelligent type air purifier for the vehicle uses an ultraviolet light emitting diode as a ultraviolet light source, thereby guaranteeing the photocatalyst to be capable of playing the role of degrading pollutants efficiently. The inner surface and the outer surface of an enclosure all have antibacterial performance, thereby guaranteeing bacteria not to live on the surface of an airframe of the omnidirectional antibacterial intelligent type air purifier for the vehicle, and guaranteeing personal safety. The omnidirectional antibacterial intelligent type air purifier for the vehicle can automatically induct air conditions, adjusts purification power in real time, and has intelligent control function.

The invention discloses a preparation method of a TiO2/ZIF-8 nanocomposite with a core-shell structure. The preparation method comprises the following steps: firstly, tetrabutyl titanate is added to an ethylene glycol solution and stirred uniformly, the mixture is added to anhydrous acetone, stirred quickly and left to stand, and TiO2 amorphous nano-beads are obtained through separation, washing and drying; the nano-beads are added to a tetramethylammonium hydroxide aqueous solution and react at 160-200 DEG C, and TiO2 nano-beads are obtained through separation, washing and drying; the prepared TiO2 nano-beads are added to a methanol solution of Zn(NO3)2*6H2O and are stirred, a methanol solution of 2-methylimidazole is then added, and the TiO2/ZIF-8 nanocomposite with the core-shell structure is obtained through separation, washing and drying. The preparation method has mild preparation conditions and simple process; the synthesized TiO2/ZIF-8 composite has uniform size and good dispersity and is expected to be applied to gas separation, photoelectric materials, photocatalytic materials and the like.

The invention discloses a bifunctional micro-encapsulation phase-change energy storage material with a photo-catalysis property and a preparation method thereof. A core material of the bifunctional micro-encapsulation phase-change energy storage material is a phase-change material such as high-grade aliphatic alkane, alcohol, acid, acid ester and the like, and a wall material of the bifunctional micro-encapsulation phase-change energy storage material is crystalline titanium dioxide or element-doped crystalline titanium dioxide with the photo-catalysis property. The preparation method comprises the steps of mixing and stirring 2.0-3.4wt.% of surfactant, 79.0-80.0wt.% of solvent, 6.0-10.0wt.% of phase-change energy storage material and 4.5-8.5wt.% of titanium source in percentage by weight to form a stable emulsion; adding mixed liquid of the solvent and water to initiate reaction; then adding 0.0-3.0wt% of crystallization induction additive in percentage by weight to obtain the micro-encapsulation phase-change energy storage material of a crystalline titanium dioxide coated organic phase-change material. The micro-encapsulation phase-change energy storage material of an element-doped crystalline titanium dioxide coated organic phase-change material can be obtained by adding a product into a metal solution or non-metal solution while stirring.

The invention relates to a nano self-cleaning fiber reinforced cement product and a production method for the same, which particularly aim to realize photocatalysis antifouling self-cleaning and air purification functions on a traditional fiber cement product by means of coating. The product is mainly applied to building roofs, building curtain walls, wall decoration, municipal traffic engineering construction and modification works, and comprises a fiber reinforced cement structural layer, a fiber reinforced cement decorative finish layer, a nano isolation layer and a photocatalysis layer, wherein the fiber reinforced cement decorative finish layer is composited on the fiber reinforced cement structural layer, the nano isolation layer is composited between the fiber reinforced cement decorative finish layer and the photocatalysis layer, and the fiber reinforced cement structural layer and the fiber reinforced cement decorative finish layer are composited to mold in a mould with a modeling. Net-shaped reinforced materials are laid in the fiber reinforced cement structural layer.

The invention relates to a graphene-supported layered MoS2 (molybdenum disulfide) nanocomposite and a preparation method thereof, belongs to the technical field of preparation of nano materials, and is used for solving the problem that graphene-supported MoS2 nanoparticles prepared in the prior art are poorer in catalytic performance due to small composite areas between the nanoparticles and graphene. Ammonium molybdate and thiourea are taken as initiators, and layered nano MoS2 can be supported on the surface of graphene oxide under the hydrothermal condition; after roasting treatment, the graphene-supported layered MoS2 has the higher crystallinity, and the photocatalytic efficiency is more than 1.7 times that of commercial nano titanium oxide. The method is simple and easy to operate; MoS2 nanosheets are uniformly distributed on the surface of the graphene and have larger contact areas with the graphene, so that the nanocomposite has the high catalytic performance and is widely applied to fields of electro-catalysis, photo-catalysis, hydrogen evolution catalysis and the like.

The invention discloses a gahnitem, zinc oxide and nickel zinc nano-composite photocatalytic material which has a high specific surface area and a mesoporous structure and is prepared by roasting at high temperature by taking ternary hydrotalcite as a precursor. The material is used for the adsorption and the degradation of organic pollutants. The photocatalytic material is prepared by taking zinc nitrate, nickel nitrate, aluminum nitrate, sodium carbonate, sodium hydroxide and the like as raw materials; preparing the raw materials into salt solutions and alkali solutions respectively; mixing the solutions by using a constant-flow pump at the temperature of 80 DEGC with magnetic stirring, transferring the mixed solution into a hydrothermal reaction kettle; performing hydrothermal treatment at 130 to 180 DEG C; performing suction filtration, washing and drying to the precursor; roasting the precursor in Muffle furnace for 2 to 6 hours at the temperature of 400 to 600 DEG C to obtain the product, wherein the specific surface area is greater than 150 m<2>.g<-1>. The photocatalyst disclosed by the invention has regular shape, large specific surface area, and super-high capacity for adsorbing and degrading organics, and can be reused; the raw materials for preparing the composite photocatalyst are abundant, the cost is low, and the process is simple.

The invention relates to a silver-modified carbon nitride composite photocatalytic material and a preparation method thereof. The preparation method comprises: dissolving dicyanodiamide or melamine in deionized water or dimethyl sulfoxide and performing ultrasonic dispersing, so as to obtain a dicyanodiamide or melamine dispersion liquid; dissolving silver nitrate in deionized water and stirring uniformly, so as to obtain a silver nitrate solution; slowly dropwise adding the silver nitrate solution into the above dicyanodiamide or melamine dispersion liquid under the condition of magnetic stirring, and continuing stirring the solution, so as to obtain a mixed precursor solution; using anhydrous ethanol and deionized water repeatedly wash the obtained mixed precursor solution for multiple times, and performing vacuum drying; and putting the obtained product in a proper crucible and covering, putting in a high-temperature furnace, and sintering for a period under the condition of nitrogen protection, so as to obtain a powdery sample. The advantages comprise that the raw material source is wide, the preparation technology is simple and practicable, and the cost is relatively low; and the prepared composite photocatalytic material has relatively good photocatalytic degradation effect on organic dye rhodamine B under irradiation of visible light.

The invention discloses a graphite type carbon nitride-metal organic frame composite photocatalyst as well as a preparation method and application of the graphite type carbon nitride-metal organic frame composite photocatalyst. Graphite type carbon nitride acts as a carrier of the graphite type carbon nitride-metal organic frame composite photocatalyst; metal organic framework particles freely grow on the surface of graphite type carbon nitride, and the surfaces of the metal organic framework particles are loaded with carbon nitride nano sheets. The preparation method comprises the following steps: carrying out ultrasonic dispersion on graphite type carbon nitride into dimethylformamide so as to obtain a graphite type carbon nitride dispersion solution; stirring and mixing a carbon nitride dispersion solution, tetrabutyl titanate, methyl alcohol and an organic solvent so as to obtain a mixed solution; heating and reacting the mixed solution in a seal environment so as to obtain the graphite type carbon nitride-metal organic frame composite photocatalyst. The graphite type carbon nitride-metal organic frame composite photocatalyst can remove dye in waste water, and has the advantages of simplicity, high efficiency, environment friendliness, economic property, environment protection and the like.

The present invention relates to high weather resistant water-thinned wall paint, and especially relates to environment friendly high weather resistant water emulsion paint and its preparation process. The paint consists of water emulsion, netted skeleton material, nano functional material, hydrophilic and hydrophobic raedical containing material, solid stuffing and assistant. The preparation principle includes basing on emulsion with excellent performance, constructing netted structure, introduction nano material with UV resisting, photocatalytic and high shielding performance, introducing assistant with both hydrophilic and hydrophobic characteristic to form compact and high-adhesion coating with integrated high weater resistance.

The invention relates to a bismuthyl carbonate micro flowery material with a graded structure, which is structurally characterized in that two-dimensional nano flakes are staggered to form a flower shape, and the average diameter of the flakes is 3 to 4 microns. The material is prepared by fist dissolving bismuth nitrate into dilute nitric acid and then gradually dripping the dilute nitric acid into excessive sodium carbonate solution and reacting the solution. A preparation method can be implemented at the low temperature and the normal pressure, and has the advantages of short time consumption, low cost, simple equipment, easy operation and large-scale production. Because of a large specific surface area, the prepared bismuthyl carbonate micro flowery material with the graded structure has important practical application in the aspects of pharmacy and sterilization; and meanwhile, the material with the large specific surface area has good performance in the aspect of degrading organic pollutants by photocatalysis.

The invention discloses a composite photo-catalyst with a molybdenum disulfide (MoS2) nanosheet/ cadmium sulfide (CdS) nanowire core-shell structure, and a preparation method of the composite photo-catalyst, belonging to the technical fields of material preparation and photo-catalysis. The composite photo-catalyst takes a one-dimensional CdS nanowire as a core and takes a two-dimensional MoS2 nanosheet as a shell, and is compounded by an electrostatic self-assembly method through a hydrothermal process. The raw materials of the composite photo-catalyst can be easily obtained, and the preparation method is simple in process and convenient to operate; the prepared composite material with the core-shell structure is better in stability, has excellent photocatalytic activity and can be used for catalyzing photolysis of water for preparing hydrogen; furthermore, the core-shell structure is capable of effectively preventing the sulfur loss of the CdS nanowire and slowing down photocorrosion, and has wide application prospect in the field of photo-catalysis.

The invention discloses a method for preparing a molecularly imprinted TiO2/WO3 composite photocatalyst with visible light response through a direct method. The method is as follows: a titanium alkoxide is used as a sol and functional monomer precursor, an organic pollutant is used as a template molecule, absolute alcohol is used as a solvent, glacial acetic acid is used as an inhibitor, a sol-gel method is adopted, and the materials are prepared according to a certain ratio, wherein the molar ratio of the template molecule to Ti is 1:20-1:10, and the titanium alkoxide, absolute alcohol, glacial acetic acid and water are mixed in a volume ratio of 10:19:8:4. The method has the following technical effect: the titanium alkoxide has double functions, namely the titanium alkoxide can be used as a titanium source and can also be used as a functional monomer in the hydrolysis process. Other organic functional monomers are not required.

The invention discloses a metal/grapheme nanocomposite and a preparation method thereof. The method comprises a photo-reduction one-step method and a photocatalytic reduction one-step method. The photo-reduction one-step method comprises the steps as follows: a grapheme oxide and metal complex acid or inorganic salt and a photo-reduction agent are mixed at the room temperature or under the condition of an ice-water bath, and under the light condition, organic negative hydrogen donors reduce metal ions and the grapheme oxide, so that a product is obtained. One approach of the photocatalytic reduction one-step method comprises the steps as follows: the grapheme oxide and the metal complex acid or salt are mixed in a DMF (dimethyl formamide) water solution containing a reducing agent, a metal ligand and a photocatalyst or in a water solution, catalysis is performed through the catalyst under the light condition, and at the same time, the reducing agent reduces the metal ions and the grapheme oxide, so that a product is obtained; and the other approach of the photocatalytic reduction one-step method comprises the steps as follows: the grapheme oxide and a metal organic complex are mixed in a DMF water solution containing the reducing agent and the photocatalyst or in a water solution, then catalysis is performed through the catalyst under the light condition, and the reducing agent reduces the metal organic complex and the grapheme oxide, so that a product is obtained.

A method of carrying out a catalytic reaction with a catalytic reaction system comprising octahedral-based structures, such as a solid-solution or an ordered layered material, with specific early and late transition metals are described. A late transition metal is included in the solids so that a greater amount of solar energy can be absorbed by the catalytic reaction system and the solar efficiency of the method is increased. Catalytic compounds and compositions for carrying out the method are also described.

The invention discloses a method and a device for simultaneously carrying out wastewater treatment and power generation by using a photocatalysis associated microbial fuel cell technology. The device takes conductive glass coated with an n-type semiconductor photocatalyst film as an outside wall of a cathode chamber and takes conductive glass coated with an n-type semiconductor photocatalyst film as an outside wall of an anode chamber, a conductive filler respectively connected on the outside walls of the cathode chamber and the anode chamber is used as an electrode of a microbial fuel cell. The conductive filler is a carbon fiber rope for microbial growth. Denitrifying bacteria and nitrifying bacteria are respectively cultivated at the cathode and anode of the microbial fuel cell, and mainly used for the degradation of organic matters and the removal of ammonia nitrogen. Under the irradiation of ultraviolet light, electrons flow from the anode to the cathode, so that the anode has strong oxidability, and the cathode has strong reducibility. In the invention, the functions of microbial fuel cells and a photocatalysis technology are mutually associated, so that the wastewater treatment cost is low, and the generating capacity is large.

The invention relates to an atom dispersion water oxidation catalyst and a preparation method and application thereof. The method comprises the steps that firstly, metal ions and nonmetal atoms are embedded into a carbon-based material framework; and generated oxides are removed through acid treatment, so that the atom dispersion catalyst is obtained. By means of the method, the dispersive atom catalyst containing the metal ions such as vanadium, chromium, manganese, iron, cobalt, nickel, copper, ruthenium, palladium, silver, cadmium, iridium and lead can be prepared. The metal ions in a material synthesized through the method are mainly embedded into the framework of a carbon-based carrier in the form of single atoms, and the metal loading amount can reach 1.5% or above by weight. The catalytic performance of the atom dispersion catalytic material prepared through the method can compare favorably with that of PSII in the nature; the preparation cost is low; and the wide application prospect can be achieved in the processes of water decomposition conducted through electro-catalysis, water decomposition conducted through photoelectrocatalysis, water decomposition conducted through photo-catalysis and manual photosynthesis carbon dioxide reduction and conversion.

The present invention discloses a three-phase ultrasonic photo-catalyzed reaction device and a CO₂ reducing method with the device. With the device, a photo-catalyst is placed in a photo-reactor, and the reactor is placed in a water bath of an ultrasonic generator. A light source is arranged above the photo-reactor. The method is that the CO₂ gas to be reduced is mixed evenly with the photo-catalyst and a sodium hydroxide solution in the photo-reactor under the ultrasonic action, and reacts for 3-20 hours with radiation of the light source. Then the CO₂ gas is reduced. The photo-catalyst is made from titanium dioxide or silicon dioxide and metal phthalocyanine. Metal phthalocyanine is supported on the surface of titanium dioxide in the way of in-situ synthesis, sol-gel, and immersion. The present invention promotes the photo-catalysis efficiency, reduces the reaction time, and saves the energy. Visible light can be used for reducing. Moreover, the phot-catalyst can be recycled, which reduces the pollution and the cost, sot the present invention is quite applicable for the three-phase ultrasonic photo-catalyzed reaction device and photo-catalyzed CO₂ reducing.

The invention discloses a preparation method of a piece of titanium dioxide-graphene composite nano paper. The titanium dioxide-graphene composite nano paper mainly comprises a titanium dioxide nano zone and graphene, or a titanium dioxide nano zone, graphene and additives. The preparation method of the titanium dioxide-graphene composite nano paper mainly comprises the following procedures of synthesizing, compounding, dispersing, suction filtering, drying and the like. Compared with the ordinary nano granules or nano films, the titanium dioxide-graphene composite nano paper is more excellent in performance, simple in manufacturing method and lower in cost. Due to the introduction of the graphene, the nano paper has good conductivity, can effectively solve the problem that electrons are compounded with cavities when being excited, and improves the photocatalysis efficiency. The composite nano paper has important application prospects in high-tech fields of photocatalysis, sensors, electronic devices and the like. The composite nano paper has the advantages of reasonable design, simple process, non-toxicity, harmlessness, low price and the like, is easy to operate and can be directly cut.

The invention discloses a covalence triazine organic polymer visible-light-driven photocatalyst and the preparing method and application thereof and belongs to the technical field of material preparation and photocatalysis. According to the method, normal-temperature liquid-phase polymerization is adopted, para-phthalonitrile serves as the monomer, trimerization is conducted under the catalysis of trifluoromethanesulfonic acid, and then the covalence triazine organic polymer visible-light-driven photocatalyst is prepared. By means of the photocatalyst, visible-light reaction is achieved, hydrogen production through water photolysis can be achieved without obvious inactivation, and organic pollutants in waste water can be effectively degraded. The preparing condition is mild, production cost is low, yield is high, actual production requirements are met, and application potential is great.

The invention discloses a preparation method of nano ferrate/carbon nano tube composite materials, which utilizes a carbon nano tube as a supporting material and adopts a method of solvothermal synthesis to prepare a series of nano ferrate/carbon nano tube composite materials which are even in dispersion, have magnetic property, include nano cobalt ferrite/carbon nano tubes, ferrous acid nickel/carbon nano tubes, ferrous acid copper/carbon nano tubes, zinc ferrite/carbon nano tubes, ferrous acid manganese/carbon nano tubes and the like, and have certain universality. Compared with the prior art, the preparation method of the nano ferrate/carbon nano tube composite materials utilizes ethanol as solvent. The prepared nano materials are uniform in grain size and excellent in performance and have good application prospect and economic benefits on aspects of photocatalysis sewage treatment, lithium ion batteries and the like.

The invention belongs to the technical field of functional concrete, and relates to a concrete material having a function of purifying gas-solid pollutants. The concrete material is characterized by being prepared from the components of cement, fine aggregate, coarse aggregate, water, water reducing agent, photocatalyst, an alkali solution and retarder, wherein the cement is 260-530 kg/m<3>, the silica fume content is 0-10 wt% of the cement content, the fly ash content is 0-25 wt% of the cement content, and the slag content is 0-40 wt% of the cement content; the coarse aggregate is 255-850 kg/m<3>, and the sand ratio is 30-45%; the water is 155-220 kg/m<3>; the mixing amount of the water reducing agent accounts for 0.5-1.2% of the total weight of the cement; the photocatalyst is 5-25 g/m<2>; the retarder content accounts for 0.01-1.0% of the weight of the cement to be removed on the surface layer of the concrete; the photocatalyst is put into the alkali solution to prepare a mixture; and the concentration of the photocatalyst is 1-5 g/L. The concrete material prepared by the method has a function of purifying gas-solid pollutants.

The invention belongs to the technical field of nano titanium dioxide photoelectrochemistry and photocatalysis and particularly relates to a preparation method of a titanium dioxide nanotube thin film with visible-light activity. Raw materials used for preparing the titanium dioxide nanotube thin film comprise a metallic titanium sheet or a Ti thin film and carbon quantum dot solution. A direct-current regulated power supply is used for anode oxidization. A muffle furnace is used for heat treatment. The preparation method of the titanium dioxide nanotube thin film with visible-light activity specifically comprises the following steps of preparing a TiO2 nanotube array on the metallic Ti sheet or the Ti thin film by adopting an anode oxidation method, and after annealing treatment, preparing a TiO2 nanotube composite thin film with visible-light activity modified by carbon quantum dots by directly adopting a dipping assembling method, wherein the modification quantity of the carbon quantum dots is adjusted by controlling dipping time. The preparation method of the titanium dioxide nanotube thin film with visible-light activity has the advantages that the process is simple, any expensive equipment and high-cost or toxic drugs are not used, the principle of energy saving and emission reduction is satisfied and a new concept for the modification and the application of titanium dioxide is developed.

The invention relates to a photocatalytic material, and particularly relates to a preparation method of an indium sulfide/carbon nitride composite nano material. The preparation method of the indium sulfide/carbon nitride composite nano material comprises the following steps: weighing g-C3N3 powder, dissolving into purified water, carrying out ultrasonic dispersion uniformly, then adding In(NO3)3.4.5H2O, carrying out magnetic stirring until dissolving completely, dropwise adding the prepared C2H5NS solution, carrying out magnetic stirring, transferring into a reaction kettle with an inner liner made of Teflon, putting into a baking oven, and carrying out hydrothermal reaction; and cleaning and drying to obtain the indium sulfide/carbon nitride composite nano material. The method protects the environment, is efficient, simple, convenient and feasible, and the prepared In2S3/g-C3N4 composite material has a favorable application prospect in the fields of photocatalysis and the like.

The invention discloses a g-C3N4/{001}TiO2 composite visible-light-driven photocatalyst and a preparation method and application thereof. According to the method, an HF solution is added into tetrabutyl titanate, stirring and a hydrothermal reaction are conducted, cooling is carried out until the indoor temperature is reached, solid sediment is washed through ethyl alcohol and deionized water, dried and ground into fine powder, and then {001}TiO2 powder is obtained; the {001}TiO2 powder and predecessor of g-C3N4 are mixed, the mixture is moved to a semi-closed crucible, the semi-closed crucible is placed in a muffle furnace so that the mixture can be calcined at the air atmosphere, and the g-C3N4/{001}TiO2 composite visible-light-driven photocatalyst is obtained. The prepared composite visible-light-driven photocatalyst can be widely applied to the aspects of atmosphere purifying, waste water treating and the like, the preparation technology is extremely simple, the adopted raw materials are low in price and easy to obtain, and the prepared composite visible-light-driven photocatalyst has very large practical application potentiality.

The invention belongs to the technical field of films, and in particular relates to a photocatalytic inorganic nanoparticle/polydopamine/polymer self-cleaning composite film and a preparation method thereof. According to the preparation method, photocatalytic inorganic nanoparticles are modified to the surface of the composite film by using a chemical binding method, so that the stability of the inorganic nanoparticles on the surface of the composite film is improved, and the contact of the inorganic nanoparticles with pollutants is prompted so as to improve the photo-degradation efficiency of the inorganic nanoparticles, therefore, the self-cleaning capability of the composite film is improved. In addition, as polydopamine is used as a free group quencher, a polymer matrix is effectively prevented from being degraded when being affected by the photocatalytic inorganic nanoparticles in the UV (Ultraviolet) radiation process, so that the property stability of the composite film is improved, and the service life of the composite film is prolonged. The preparation method is simple in operation process, gentle in preparation condition, low in production cost and easy for in-batch and in-scale production, and has a good industrialization production basis and a wide application prospect.

The invention discloses a C3N4 nanosheet with a molecular-scale thickness as well as a preparation method and an application thereof, which belong to the technical fields of material preparation and photocatalysis. The C3N4 nanosheet photocatalyst with a molecular-scale thickness disclosed by the invention is prepared in a water/ethanol mixed system via an ultrasonic treatment-stirring combination method. The preparation method of the catalyst comprises the following two steps of: step 1, synthesising a bulk-phase C3N4 precursor via a solid-phase thermal polymerization method; and step 2, stripping via ultrasonic treatment-stirring combination to prepare the C3N4 nanosheet. The C3N4 nanosheet photocatalyst prepared by the preparation method is high in specific surface area and photon-generated carrier separation efficiency, capable of efficiently degrading organic pollutants, and particularly efficiently decolouring printing and dyeing wastewater, and high in activity in the aspects of hydrogen production from photocatalytic water splitting and photocatalytic selective oxidation for alcohols simultaneously. The catalyst is simple in preparation process, low in cost, green and environment-friendly in production process, high in stability, capable of meeting actual production needs, and high in application potential.