371 results about "Photocatalytic water splitting" patented technology

The present invention discloses a method for preparing heteroatom doped carbon quantum dot, and application thereof in fields of biomedicine, catalysts, photoelectric devices, etc. The various kinds of heteroatom doped carbon quantum dots are obtained by using a conjugated polymer as a precursor and through a process of high temperature carbonization. These carbon quantum dots contain one or more heteroatoms selected from the group consisting of N, S, Si, Se, P, As, Ge, Gd, B, Sb and Te, the absorption spectrum of which ranges from 300 to 850 nm, and the fluorescence emission wavelength of which is within a range of 350 to 1000 nm. The carbon quantum dot has a broad application prospect in serving as a new type photosensitizer, preparing drugs for photodynamic therapy of cancer and sterilization, photocatalytic degradation of organic pollutants, photocatalytic water-splitting for hydrogen generation, organic polymer solar cell and quantum dot-sensitized solar cell.

Photocatalytic water splitting is employed as a method to directly obtain clean hydrogen from solar radiation by using hybrid nanoparticles with metallic cores and semiconductor photocatalytic shells. Efficient unassisted overall photocatalytic splitting of water is based on resonant absorption from surface plasmon in metal core / semiconductor shell hybrid nanoparticles, which can extend the absorption spectra further towards the visible-near infrared range, thus dramatically increasing the solar energy conversion efficiency. When used in combination with scintillator nanoparticles, the hybrid photocatalytic nanoparticles can be used for conversion of nuclear energy into hydrogen.

The invention discloses a Cu2O-TiO2 / g-C3N4 ternary complex and a preparation and application method thereof. The preparation method comprises the steps that firstly, urea and TiO2 are mixed through a simple physical method, water is added to the mixture, the mixture is dried by distillation, calcination is conducted, and then a binary complex of TiO2 / g-C3N4 is obtained; secondly, by means of sediment and reduction processes, the Cu2O-TiO2 / g-C3N4 ternary complex is prepared. The preparation method is simple, cost is low, and industrial production is facilitated. The prepared ternary complex serves as a visible-light-driven photocatalyst which has high catalytic activity in the visible region, the catalytic efficiency is high, and various organic pollutants in a solution can be degraded instantly; the prepared ternary complex can also serve as a visible-light-driven photocatalyst which is applied to hydrogen preparing of photocatalytic water splitting, degrading of volatile organic pollutants in air and the like, and very good application prospects are achieved.

The invention discloses a tungsten trioxide nano-film with photocatalytic performance, and a preparation method thereof. The tungsten trioxide nano-film is characterized in that a WO3 nano layer with a WO3 nano structure is grown on a WO3 crystal seed layer, and the WO3 nano structure is shaped like a two-dimensional flying saucer including a middle main sheet and a nano-column. The preparation method of the tungsten trioxide nano-film comprises the steps of preparing a tungsten acid crystal seed layer precursor solution, preparing FTO (Fluorine-doped Tin Oxide) conductive glass with the crystal seed layer, preparing thermal tungsten acid solvent precursor solution, and finally performing hydrothermal synthesis to obtain the tungsten trioxide nano-film. According to the tungsten trioxide nano-film with photocatalytic performance, and the preparation method thereof, the specific surface area of the WO3 nano layer can be effectively enlarged; the efficiency of photocatalytic water splitting can be improved, the performance of photocatalytic water splitting in a photoelectric chemical pool is excellent, and excellent chemical stability can be achieved, the preparation method is simple, and the low-cost and large-scale application can be realized.

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.

The invention discloses Ni-doped Cd0.1Zn0.9 S microsphere photocatalyst and the preparation method thereof, the particle shape of the produced photocatalyst is a microsphere formed by nanometer crystals, and the doping amount of Ni is 0.1 percent to 0.5 percent of the weight of the catalyst. The invention has the preparation method that zinc sulfate, cadmium sulfate, nickel nitrate, and thioacetamide are taken as raw materials to form mixed solution which is sealed in a hydrothermal caldron and then laid in a baking oven to be insulated, naturally cooled to the room temperature, a resultant is obtained through cleaning, drying, and grinding. The Ni-doped Cd0.1Zn0.9S microsphere photocatalyst is prepared by the invention, and the anti-surface oxidation capability in air and the photo-corrosion resistant capability in the photocatalytic reaction are evenly enhanced greatly. Because the particle of the photocatalyst is microsphere-shaped, the photocatalytic activity for photocatalytic water splitting into hydrogen of visible light of the catalyst is greatly enhanced, and the highest hydrogen production rate reaches 191.01 micromole / (g*h). The quantum efficiency reaches 6.77 percent at the 420 nm position. After Pt of 0.6 wt percent is loaded, the highest hydrogen production rate reaches 585.45 micromole / (g*h), which is three times than the hydrogen production rate when the Pt is not loaded. The quantum efficiency reaches 15.9 percent at the 420 nm position, the activity is high, and the stability is good.

The invention discloses a gold nanoparticle-modified dendritic titanium dioxide nanorod array electrode, as well as a preparation method and an application of hydrogen production by photocatalytic water splitting. The gold nanoparticle-modified dendritic titanium dioxide nanorod array electrode comprises a trunk nanorod densely distributed with dendritic structures on the surface, wherein gold nanoparticles are uniformly loaded on the surfaces of the dendritic structures. The preparation method is composed of three steps, namely, preparation for a TiO2 nanorod array, preparation for a dendritic TiO2 nanorod array, and preparation for gold nanoparticle-sensitized dendritic TiO2 nanorod array. According to the nanorod array electrode, the preparation method, and the application, the compounding of electron-hole pairs is effectively suppressed; the photocatalytic water splitting efficiency of the material is increased; the light absorption range of the material is expanded to a visible region via the surface plasma resonance (SPR) effect of gold nanocrystalline, thus improving the activity of the photocatalytic water splitting of a photoelectrochemical cell, and the material is great in stability simultaneously. The preparation method disclosed by the invention is simple, excellent in the performance of hydrogen production by photocatalytic water splitting, good in chemical stability, and capable of realizing low-cost and large-scale application.

The invention discloses a flower-shaped mesoporous titanium dioxide material and a preparation method and application thereof. The material is prepared by the following method: 1) adding a template agent into a diluent, adding concentrated hydrochloric acid, and stirring evenly; 2) adding a titanium source into the solution, and stirring; 3) placing the solution in the conditions of the relative humidity above 60% at the temperature of 40-80 DEG C for 12h-24h, crystallizing at 80-90 DEG C for 6-12h; and 4) refluxing a sample to remove a surface active agent, and drying to obtain the flower-shaped mesoporous titanium dioxide. According to the method, high-temperature calcinations is not needed, the reaction synthesis temperature is lower than 100 DEG C, and the obtained flower-shaped mesoporous titanium dioxide material has the advantages of good monodispersity, high specific surface area and controllable crystalline phase and the like. The flower-shaped mesoporous titanium dioxide material can be used for negative electrode materials of a lithium ion battery, has high charge and discharge specific capacity, stable cycle performance, excellent high rate performance and very good photocatalytic activity, and can be used in the fields of degradation of organic pollutants, photocatalytic water splitting for hydrogen production, dye-sensitized solar cells and the like.

The invention provides an electrodeposition preparation method of a carbon nanotube / transition metal compound composite material. The method comprises the following steps: adding carbon nanotubes into a solvent, carrying out ultrasonic treatment to obtain a suspension, adding the suspension to a preprocessed glassy carbon electrode surface in a dropwise manner, and naturally air-drying to form a uniform carbon nanotube thin layer in order to obtain a carbon nanotube modified glassy carbon electrode; adding a precursor A and a support electrolyte into deionized water, adding a precursor B when necessary, and adjusting the pH value to 0-13 by boric acid and / or sodium hypophosphite to obtain an electroplating solution; and electroplating the carbon nanotube modified glassy carbon electrode in the electroplating solution, cleaning with water, naturally drying at normal temperature, and scrapping a carbon nanotube / transition metal compound composite material off the surface of the glassy carbon electrode by using a blade to obtain the carbon nanotube / transition metal compound composite material. The method has the advantages of simple operation and easy large scale production; and the prepared composite material has great advantages in catalytic hydrogen evolution and energy conversion, and can be applied in the fields of production of hydrogen through photocatalytic water decomposition, and photoelectric conversion.

The invention discloses a catalyst capable of responding to visible light and being used for producing hydrogen by photocatalytic water splitting and a preparation method of the catalyst. The catalyst comprises CdS and an auxiliary loaded on the CdS, and the auxiliary is a mixture of NiS and an optional one of PdS, Ru2S3, Rh2S3 and Ag2S. The CdS is added into aqueous solution containing an S compound, and a Ni compound and a compound containing an optional one of Pd, Ru, Rh and Ag are added into the aqueous solution under the condition of stirring to obtain the catalyst capable of producing the hydrogen by photocatalytic water splitting via stirring. The auxiliary of the photochemical catalyst capable of absorbing the visible light is added with Ni metal, load of auxiliaries which are precious metals is obviously reduced, and the cost for preparing the catalyst can be lowered.

The invention belongs to the technical field of semiconductor materials and nanometer, specifically relates to a gallium oxide heterogeneous structure and a growth method thereof, and particularly relates to a method and a special device for a gallium oxide heterogeneous structure with a pseudo quartic symmetry nanometer size formed by beta-Ga2O3 and k-Ga2O3. The gallium oxide heterojunction comprises a beta-Ga2O3 nanowire trunk and a k-Ga2O3 nanorod on the surface of the beta-Ga2O3 nanometer linear trunk, wherein the length of the beta-Ga2O3 nanowire is 5-100 mu m and the diameter is 50-1000nm; the size of the k-Ga2O3 nanorod is 50-200nm and is distributed on the nanowire surface in a mode of pseudo quartic symmetry. The method adopted in the invention can be used for accurately controlling the temperature and ammonia gas flow in a deposition area in the process of chemical vapor deposition (CVD), so as to spontaneously form a k-Ga2O3 / beta-Ga2O3 heterogeneous structure, and the obtained k-Ga2O3 is a new crystal structure in a gallium oxide system and has rhombic symmetry. The prepared k-Ga2O3 / beta-Ga2O3 heterogeneous structure has extremely strong cathode ray fluorescence property in an ultraviolet region, has the discrete characteristic of luminescence and is suitable for serving as an ultraviolet light electricity detector and suitable for hydrogen production through photocatalytic water splitting.

The invention discloses a preparation method for a porous nano p-CuS / n-CdS compound semiconductor photochemical catalyst. According to mass percents of templates of copper salt, cadmium salt, a sulfocompound and a sublimable compound and deionized water (0.001%-75%): (0.00001%-90%): (0.001%-85%): (0.001%-75%): (0.001%-98%), and sequentially subject to processes of reaction, centrifugal separation, distilled water washing, ultrasonic dispersion, centrifugal separation, ultrasonic treatment, reduced pressure distillation, drying, roasting, natural cooling, grinding and the like, the p-CuS / n-CdScompound semiconductor photochemical catalyst is obtained. On the condition that visible light and sunlight serve as light sources, the p-CuS / n-CdS compound semiconductor photochemical catalyst can be applied to hydrogen production of photocatalytic water splitting and photocatalytic degradation of organic pollutants. The preparation method is simple and practicable in process, small in investment and beneficial for popularization and application.

The invention discloses a preparation method of a precious-metal-free high-activity photocatalytic-water-splitting hydrogen-producing catalyst. In the invention, photocatalytically hydrogen-producing activities of a precious-metal-free NiOx-CdS photocatalyst, a precious-metal-free Ni-CdS photocatalyst and a precious-metal-free flower-shaped Ni / Ni(OH)2-CdS photocatalyst are all better than that of Pt-CdS, wherein the NiOx-CdS photocatalyst, the Ni-CdS photocatalyst and the Ni / Ni(OH)2-CdS photocatalyst are prepared respectively through an in-situ photodeposition method, a hydrothermal reduction method and a hydrothermal method. NiOx and Ni can effectively transfer and separate photoproduced electronics and holes so that the photocatalytically hydrogen-producing activity of the catalyst is enhanced. In addition, because of an unique flower-shaped structure of the flower-shaped Ni / Ni(OH)2, CdS can be inserted into a laminated structure of the Ni / Ni(OH)2 well and be contacted tightly with the Ni / Ni(OH)2, thereby forming a composite catalyst having an excellent photocatalytically hydrogen-producing activity under a photochemical effect.

The invention relates to preparation and high-efficiency hydrogen production of a novel surface plasma enhanced high-efficiency photocatalytic water splitting composite catalyst Au / CdX (X refers to S, Se and the like). The Au / Cd core-shell structure nanocrystalline consists of Au particles serving as a core and a CdX semiconductor serving as a shell layer, wherein the size of the Au particles is 20-45nm; the CdX shell layer is a single crystalline layer of 2-12nm; and the crystal form is a hexagonal phase of wurtzite. The preparation method comprises the following steps: adding a precursor into hydrosol of the Au / Ag nanoparticles to be converted into Au / AgX; adding a cadmium salt and a phosphine ligand, reacting at the temperature of 50 to 80 DEG C to generate the Au / CdX catalyst. The photocatalytic water splitting hydrogen production efficiency of the catalyst is 20-30mol / g / h and is higher than that of pure CdS quantum dots of the same mass by over 1000 times. The water solubility is high, the inverted phase is not needed during the test, the operating device is simplified, and the time is shortened. Meanwhile, the material utilization rate is improved, the synthesis condition is mild, and the catalyst is environmentally friendly, feasible and low in cost and has wide application prospects in the field of photocatalysis.

The invention discloses a silver-doped zirconium dioxide photocatalyst which is mainly prepared from the following steps: 1) taking industrial-grade zirconium dioxide, putting in a muffle furnace, and carrying out high-temperature calcination to obtain an intermediate sample 1; 2) putting the intermediate sample 1 in a strongly alkaline solution, dropwisely adding a silver-ion-containing water solution while stirring, and continuing stirring to obtain an intermediate sample 2; 3) putting the intermediate sample 2 into a high-pressure autoclave, and carrying out hydrothermal reaction to obtain an intermediate sample 3; and 4) putting the intermediate sample 3 into a centrifuge tube, carrying out centrifuge washing until the pH value of the supernate is 7, and drying at normal temperature to obtain the silver-doped zirconium dioxide photocatalyst. The invention also discloses application of the silver-doped zirconium dioxide photocatalyst in photocatalytic water decomposition. The silver-doped zirconium dioxide photocatalyst fills up the blank in the silver-doped zirconium dioxide photocatalyst in the prior art, and has the advantages of uniform size, high photocatalytic water decomposition efficiency, simple preparation method and low production cost.

The invention provides a novel tin oxide semiconductor photocatalyst. A bivalent chloride of tin SnCl2.2H2O or a bivalent bromide of tin SnBr2.2H2O is dissolved in methanol or ethanol, and a hydrothermal reaction is carried out in a hydrothermal reaction kettle at 150 DEG C to obtain a SnO2 nano semiconductor material with visible light response, wherein the average grain size is 2.5nm, the absorption edge of single-phase SnO2 powder reaches 570nm and is corresponding to a bandgap of 2.17eV, higher light anode current is displayed within a visible wavelength range and reaches a mA / cm<2> level, and half reaction activity of producing hydrogen and oxygen is also achieved. The preparation method comprises the following steps: dissolving the bivalent chloride of tin SnCl2.2H2O or the bivalent bromide of tin SnBr2.2H2O in methanol or ethanol to prepare an alcoholic solution with concentration of 20mmol / L, carrying out the hydrothermal reaction in the hydrothermal reaction kettle at 150 DEG C for at least 24 hours, standing, filtering, and drying filtrate solid at 50-80 DEG C to obtain the novel tin oxide semiconductor photocatalyst. The application comprises: preparing the product into a photoelectrode. Under visible light response, the photoelectrode has higher photoelectrochemical water splitting activity, so that the photoelectrode is used for photocatalytic water splitting or is used as a visible-light-induced photocatalyst.

The invention discloses a 1T-MoS2-modified ZnCoS solid solution hollow dodecahedral nanocomposite and a preparation method and application thereof. Firstly, a ZnCo-MOF is calcined at a high temperature to obtain a derivative of the ZnCo-MOF, then the derivative and molybdate are subjected to hydrothermal vulcanization reaction to obtain a MoS2 / ZnCoS nanocomposite, and the ZnCo-MOF is a bi-metal organic framework material and is obtained through reaction of cobalt acetate, zinc acetate and dimethylimidazole. The bi-metal organic framework material with a large specific surface area and a stablethree-dimensional space structure is used as a template, the ZnCo bi-metal oxide derivative is obtained through high-temperature calcination, and finally a mixture of the derivative and the molybdateis subjected to hydrothermal vulcanization to obtain the transition metal sulfide nanomaterial with high catalytic activity. The prepared hollow polyhedral MoS2 / ZnCoS nanocomposite has high performance of producing hydrogen by water decomposition under photocatalysis.

The invention relates to a POM (polyoxometalate)-based crystal material adopting a 3D intercalation structure and a preparation method of the POM-based crystal material, in particular to a POM-based crystal material adopting the 3D intercalation structure and having a photocatalytic water splitting hydrogen production effect and aims to solve the problems that most POM-based inorganic-organic hybrid materials synthesized in the prior art have no open pore channels, as a result, guest molecules cannot approach catalytic centers, the catalytic effect is poor, the water splitting hydrogen production effect under irradiation of xenon lamps is not realized and the like. The chemical formula of the designed and developed POM-based crystal material adopting the 3D intercalation structure is [CuII5(2-ptza)6(H2O)4(GeW12O40)].4H2O. The method comprises the steps as follows: tungstic acid, copper nitrate and 5-(2-pyridine)-tetrazole organic ligands are dissolved in deionized water, the pH value is adjusted, and the solution reacts at 120 DEG C for 3 days. The POM-based crystal material adopting the 3D intercalation structure and having the photocatalytic water splitting hydrogen production effect can be obtained.

The invention discloses a preparation method of flexible organic piezoelectric-photocatalytic composite helical fibers. The method comprises the following steps: precursor liquid of a photocatalyst, an organic piezoelectric material and a solvent is prepared; the precursor liquid is loaded into a microfluidic device and allowed to flow out from a liquid outlet pipe with a certain caliber at a certain rate; and the effluent precursor liquid is allowed to flow into a curing liquid for curing to obtain the helical fibers. The organic piezoelectric-photocatalytic composite helical fibers preparedwith the method can continuously generate self-repairing piezoelectric potentials under the action of waterflows, so that the separation of photo-generated electron-hole pairs in the photocatalyst canbe effectively promoted, and the photocatalysis efficiency can be greatly improved; and by adopting the composite helical fibers prepared with the method, the organic hazardous substance degradationefficiency of the photocatalyst can be remarkably improved, and the effects of hydrogen production through photocatalytic water splitting can be effectively enhanced.

The invention discloses a preparation method of a bismuth-based strontium magnetic photo-catalyst, and the bismuth-based strontium magnetic photo-catalyst, and belongs to the technical field of catalysts. According to the preparation method disclosed by the invention, bismuth nitrate and strontium ferrate are used as raw materials and sodium dodecyl benzene sulfonate is used as a dispersing agent so as to firstly prepare a precursor of the bismuth-based strontium magnetic photo-catalyst, and then a product is obtained by drying and roasting the precursor. The raw materials used in the invention are environment-friendly, the processing steps are simple, less equipment is used, the preparation period is short, the production is safe and the cost is low. The product prepared by the method disclosed by the invention has good magnetic properties, the saturation magnetism is 25.4emu / g, the coercive force is 4236.9G, the demagnetization resistance is high, and the catalyst can be conveniently recycled and reused, so the industrial production cost can be saved. The preparation method disclosed by the invention can be widely applied to preparation of the bismuth-based strontium magnetic photo-catalyst and a doped modified compound thereof, and the product prepared by the method disclosed by the invention can be widely used in the fields of organic pollutant degradation, photocatalytic water splitting hydrogen production, solar batteries and the like.

The invention discloses a phosphorus-doped graphene quantum dot-graphite phase carbon nitride p-n junction photocatalyst as well as a preparation method and application thereof. The preparation method comprises the steps of dissolving 1,3,6-trinitropyrene and Na2HPO4.12H2O into water to obtain a mixed water solution, performing hydrothermal reaction under alkaline conditions to obtain phosphorus-doped graphene quantum dots, using Pi-Pi and hydrogen-bond interaction between the phosphorus-doped graphene quantum dots and graphite phase carbon nitride to form a stable composite material. The phosphorus-doped graphene quantum dot is a p-type semiconductor material, and forms a p-n junction composite material with n-type graphite phase carbon nitride; the p-n junction composite material has remarkably improved photogenerated charge separation rate and visible-light catalytic activity, and can be used for visible-light degradation of dye or organic pollutants as well as hydrogen production from photocatalytic water splitting.

The invention belongs to the technical field of advanced porous materials, and particularly relates to mesoporous P25 titanium dioxide microspheres and a preparation method thereof. By a solvent evaporation-induced self-assembly method, a commercial amphiphilic triblock copolymer PEO-PPO-PEO is used as a templating agent, organic titanium is used as a titanium source, inorganic acid is used as a titanium dioxide skeleton crystal modifier, a rutile-anatase coexistent skeleton with uniform spherical morphology and divergent mesoporous channels is formed during solvent evaporation, and after the templating agent is removed by roasting, the mesoporous P25 titanium dioxide microspheres are obtained. The mesoporous P25 titanium dioxide microspheres have a large specific surface area and large pore volume; in the skeleton, rutile and anatase are closely packed and the ratio is adjustable, so that the separation efficiency of photogenerated charges and photogenerated holes of a material is significantly improved, and thus the photoelectric conversion efficiency and the efficiency of a reaction for producing hydrogen through photocatalytic water decomposition are greatly improved. The preparation method is simple, a wet preparation process is adopted, raw materials are easy to obtain, and the preparation method is suitable for large-scale production and has a wide application prospect in the fields of environment, energy resources and catalysis and many other fields.

The invention discloses a molybdenum-doped ZnIn2S4 hollow hierarchical-structure photocatalyst applied to photocatalytic water splitting for hydrogen production, belonging to the field of photocatalyst preparation and application. According to the invention, molybdenum powder serves as a molybdenum source, and the molybdenum-doped ZnIn2S4 hollow hierarchical-structure photocatalyst is prepared through a one-step solvothermal method. The method does not use a template agent or a surfactant, is simplified in preparation steps, and avoids excessive consumption of raw material and energy; preparation process is simple, and the raw materials are widely available; and the efficient photocatalyst is designed, regulated and controlled from the two aspects of structure and composition, so the economic benefit of photocatalysis is expected to be remarkably improved, and the industrialization process of photocatalysis is promoted.

A photocatalytic water splitting hydrogen production material CdS / Ba0.9Zn0.1TiO3 is a catalyst with a heterostructure formed by enabling CdS to be loaded to Ba0.9Zn0.1TiO3 , and the catalyst is obtained by a hydrothermal sol-gel process. When the molar ratio of CdS and Ba0.9Zn0.1TiO3 is 1:5, the expression is 20%CdS / Ba0.9Zn0.1TiO3 , and the catalytic effect of the material is optimal. Under the exposure of a xenon lamp of 300 watts, Na2S / Na2SO3 serves as a sacrifice reagent. The photocatalytic water splitting hydrogen production material CdS / Ba0.9Zn0.1TiO3 has the advantages that the catalyst is directly synthesized in a hydrothermal sol-gel process and is simple in operate, low in production cost, high in synthesis yield, extremely high in purity, good in repeatability and suitable for the requirements of expanded production; the catalyst is good in stability and convenient to recycle; and the catalyst is high in photocatalysis hydrogen production efficiency.

The invention discloses a copper phosphide and titanium dioxide nanocrystalline compound-type photocatalytic-water-splitting hydrogen production catalyst and a preparation method thereof, and belongs to the technical field of nano-catalysts. The preparation method includes the steps that copper nitrate is prepared into copper hydroxide, copper hydroxide and sodium hypophosphite are calcined at certain temperature and under nitrogen protection, and then a product is rinsed, centrifuged and dried to obtain product copper phosphide; then, copper phosphide and anatase titanium dioxide nanocrystals are mixed and ground evenly to obtain the catalyst through preparation. The reaction rate of photocatalytic-water-splitting hydrogen production can be increased to 7.94 mmol h<-1>g<-1> from 0.74 mmol h<-1>g<-1> of pure titanium dioxide, and is increased by over 10 times. In this way, the catalyst is used as a new technological means for solving energy crisis, having potential industry applicability and producing environmentally-friendly novel energy.

The invention relates to a method for preparing a ternary visible photocatalytic water splitting material with a biologically-grading porous structure. According to the preparation method, a biological multilayer three-dimensional fine structure is used as a template; by the design and preparation of a precursor solution and by the utilization of a penetration immersion method, different chemicalreactivities of biochemical components is controlled and the ternary visible photocatalytic water splitting material with the biologically-grading porous structure is prepared through surface treatment and chemical modification. As the prepared catalyst has a special appearance, the catalytic performance is greatly raised. The ternary visible photocatalytic water splitting material with the biologically-grading porous structure has a wide application prospect in the aspects of organic matter pollution treatment, photocatalysis and water splitting.

The invention discloses a perovskite-solid solution composite photocatalyst used for photocatalytic water splitting to generate hydrogen. The perovskite-solid solution composite photocatalyst is prepared in the steps that a perovskite material LaNiO3 is synthesized by using a coprecipitation method; a CdxM(1-x)S solid solution is prepared by using a hydrothermal method; the LaNiO3 and the CdxM(1-x)S solid solution are simply compounded by using an ethanol method to prepare the LaNiO3 / CdxM(1-x)S composite photocatalyst. Through a composite structure formed between the LaNiO3 and the CdxM(1-x)S,the composite photocatalyst can promote transfer of photon-generated carriers and inhibit compounding of light-generated electrons and electron holes, and therefore, the efficiency of generating thehydrogen through photocatalytic water splitting is obviously improved, and the photocorrosion phenomenon existing in a traditional photocatalyst can be relieved. Besides, the preparation method of thecomposite photocatalyst is simple and easy to implement and mild in reaction condition, and the perovskite-solid solution composite photocatalyst has wide application prospects in the aspects of development of alternative energy sources of fossil fuel, efficient utilization of solar energy and the like.

The invention discloses a preparation method for a high-concentration nanometer red-phosphorus photocatalyst dispersion. The preparation method comprises the following steps: grinding commercially available red phosphorus in water and carrying out screening with a screen mesh so as to obtain micron-size red phosphorus particles; subjecting the micron-size red phosphorus particles to solvent-thermal treatment; successively carrying out centrifugation, washing, drying and annealing so as to obtain a nanometer red-phosphorus photocatalyst; and dispersing the nanometer red-phosphorus photocatalyst in water and carrying outultrasonic treatment so as to obtain the nanometer red-phosphorus photocatalyst dispersion. The dispersion is simple to prepare and good in stability and can be stably stored for a long time; and the obtained nanometer red-phosphorus photocatalyst has a layered pore channel structure, high specific area, good recyclability, and good capacity in photocatalytic water splitting for hydrogen production and photodegradation of organic pollutants.

A photocatalytic decomposing water hydrogen production material CdS / Sr1.6Zn0.4Nb2O7 is a catalyst having a heterojunction structure formed by loading CdS on Sr1.6Zn0.4Nb2O7. The inventive catalyst is prepared by a hydrothermal method through sol gel. When a molar ratio of the CdS and the Sr1.6Zn0.4Nb2O7 is 3:7, the expression is 30%CdS / Sr1.6Zn0.4Nb2O7, and the catalytic effect of the material is best. Under the illumination of a 300 watt xenon lamp, Na2S / Na2SO3 is taken as a sacrifice reagent, the inventive material 30%CdS / Sr1.6Zn0.4Nb2O7 photocatalyzes and decomposes the water to produce the hydrogen without a co-catalyst of noble metal, and the efficiency is 645.7 mu mol.h<-1>.g<-1>. The photocatalytic decomposing water hydrogen production material of the invention has the advantages that: 1 the inventive catalyst is directly synthesized by the hydrothermal method through sol gel, the operation is simple, the production cost is low, the synthetic yield is higher, the purity is high and the repeatability is good, and the inventive catalyst is suitable for the demand of magnification production; 2, the inventive catalyst is good in the stability and is easy to reuse; and 3, the inventive catalyst has higher photocatalytic hydrogen production efficiency.

The invention relates to a preparation method of a surface hydroxylation titanium oxide / graphene visible light catalysis material. According to the method, butyl titanate, graphene and nitrate serve as raw materials, organic electrolyte serves as surfactant, and the surface hydroxylation graphene / TiO<2> catalysis material is obtained through the steps of sol application, thermostatic water bath, ultraviolet irradiation, microwave irradiation, washing, drying and the like. The preparation method has the greatest advantage that ultraviolet pre-oxidation and microwave irradiation are utilized for achieving surface hydroxylation, the preparation process is simple, the energy consumption is low, rapid synthesis can be achieved, and large-scale production is easy to achieve; meanwhile, more defects such as oxygen vacancy and Ti<3+> are caused to a composite by surface hydroxylation, surface activity is increased, forbidden bandwidth of the composite is decreased, the spectral response range is widened, the obtained graphene / TiO<2> catalysis material is great in absorption performance and high in activity, durability and antibacterial performance, and the preparation method has a wide application prospect in fields such as sewage treatment, photocatalytic water splitting, air purification, solar cells, antibacterial materials and the like.