114results about How to "Improve photocatalytic hydrogen production performance" patented technology

The invention belongs to the technical fields of material preparation and photocatalysis, and discloses a phenyl ring modified graphite-like carbon nitride photocatalyst, and a preparation method and an application thereof. The method comprises the following steps: 1, dissolving nitrogen-containing organic micro-molecules and a phenyl ring-containing compound in a solvent, and evaporating the obtained solution until the solution is dry in order to obtain a mixed precursor; and 2, roasting the mixed precursor to obtain the phenyl ring modified graphite-like carbon nitride photocatalyst, wherein the nitrogen-containing organic micro-molecules are one or more of urea and melamine; and the phenyl ring-containing compound is one or more of trimesic acid, phenol, benzoic acid and benzaldehyde. The electron structure of the photocatalyst is changed by phenyl ring modification, so the pi electron delocalization of graphite-like carbon nitride is excited, the absorption of visible lights is improved, compounding of photon-generated carriers is inhibited, and the photocatalytic hydrogen production performance is improved. The method has the advantages of simple preparation, no expensive device and good practical application prospect.

The invention specifically relates to a monoatomic catalyst and a preparation method thereof, and application of the monoatomic catalyst in photolysis of water to produce hydrogen, belonging to the technical field of nano-material preparation and hydrogen production catalysts. The catalyst is a composite material formed by loading the single atom of precious metal onto a cadmium sulfide nano-material. The preparation method comprises the following steps: (1) preparing a cadmium sulfide nano-material; (2) introducing the cadmium sulfide nano-material prepared in the step (1) into a solution ofa precious metal source to obtain a reaction solution containing a precursor; and (3) separating the precursor from the reaction solution obtained in the step (2), and calcining the precursor so as toobtain the composite material. The monoatomic catalyst of the invention can be used for photolysis of water to produce hydrogen, and the photocatalytic hydrogen production rate of the catalyst can beas high as 47.41 mmol/h/g, which is nearly 50 times the catalytic efficiency of catalysts only using cadmium sulfide; so the photocatalytic hydrogen production effect of cadmium sulfide-based catalysts are remarkably improved.

The invention discloses a MoC/ZnIn2S4 composite photocatalyst and a preparation method thereof, and belongs to the technical field of a photocatalytic material. The composite photocatalyst is made bytaking two-dimensional ZnIn2S4 nanometer sheets as a main catalyst and two-dimensional MoC nanometer sheets as a cocatalyst and adopting MoC hydrothermal induction growth ZnIn2S4 method. The method isavailable in raw materials, and is simple. The prepared composite photocatalyst is good in stability and excellent in photocatalytic activity, can be used for water decomposition via visible light toproduce hydrogen, and has bright application prospects in the photocatalytic field.

The invention discloses a two-dimensional anatase TiO2/g-C3N4 composite material. The material is a two-dimensional lamellar structure, and is obtained by compounding g-C3N4 and a TiO2 precursor through a surfactant. The composite material has a thickness of 2 to 20nm, a lateral dimension of 100nm to 2[mu]m and a specific surface area of 88 to 110m<2>*g<-1>. According to the composite material, an ethylene glycol modified Ti-O hydrate-surfactant-g-C3N4 sandwich structure is assembled under hydrophobic and hydrophilic actions, oxygen vacancies in TiO2(B) are supplied by air calcination, and the two-dimensional anatase TiO2/g-C3N4 composite material is finally obtained to realize close and homogeneous compounding of two ultrathin nanosheets, so that a large-area heterogenous interface is formed, the electron transport rate is increased and light-generated electron home recombination is suppressed; the composite material has very high photocatalytic hydrogen production performance and photocatalytic organic matter degradation activity.

The invention discloses a reduced graphene oxide/ZnIn2S4 photocatalyst and a preparation method and application thereof, belonging to the technical field of inorganic chemistry and photocatalysis. The photocatalyst is a semiconductor compound photocatalyst in which reduced graphene oxide is used as an electron transmission body, the separation of electrons from a hole is promoted and sheet ZnIn2S4 is closely packed and paved on the reduced graphene oxide, and the chemical formula is RGO/ZnIn2S4. A high-reducibility sheet RGO/ZnIn2S4 compound is synthesized by a one-step solvothermal method, and the reduction is finished without further photo-reduction or addition of a reducing agent (such as hydrazine). The compound photocatalyst prepared by the method has an efficient photocatalysis hydrogen generation effect, the preparation method is simple and easy to implement, and large-scale industrial popularization is facilitated.

The invention provides a platinum atom-loaded titanium dioxide photocatalytic material and a preparation method thereof. The preparation method of the photocatalytic material comprises the following steps: 1), dispersing nanometer titanium dioxide in deionized water to form a titanium dioxide dispersion; 2), adding a platinum precursor into the titanium dioxide dispersion, and uniformly mixing bystirring to obtain a mixed solution A, wherein the mass of platinum is 0.3-1.5% of that of the titanium dioxide; 3), performing a photoreduction reaction on the mixed solution A under light irradiation to reduce the platinum precursor into elemental platinum, and loading the platinum precursor onto the nanometer titanium dioxide to obtain a mixed solution B; 4), centrifuging the mixed solution B to obtain a precipitate, and washing and drying the precipitate to obtain the platinum atom-loaded black titanium dioxide photocatalytic material. According to the preparation method, the platinum is uniformly and highly dispersively loaded onto the titanium dioxide through control of the using amount of the platinum precursor, platinum atoms are deposited by an in-situ photoreduction technology, and the existing form of the platinum atoms on the surface of the black titanium dioxide is controlled through control to the addition amount of chloroplatinic acid, so that the photocatalytic effect is improved.

The invention relates to I-III-VI group semiconductor quantum dots, in particular to a synthesis method for an Ag-In-Zn-S/CQDs heterojunction material. The synthesis method comprises the following steps: weighing and dissolving silver nitrate, indium nitrate and zinc acetate dihydrate in deionized water, stirring and dissolving to obtain a clear solution; dissolving a mixed ligand thiohydracrylicacid (MPA) and L-cysteine (Cys) in an aqueous solution; then adding into the clear solution to obtain a mixed solution; adjusting the pH value of the mixed solution with a NaOH solution; then adding thioacetamide and stirring ultrasonically; then adding carbon quantum dots in different amounts; then carrying out a hydrothermal reaction; and after the reaction, carrying out centrifugal drying to obtain the Ag-In-Zn-S/CQDs heterojunction material with different photocatalytic performance by selecting the capacity of the carbon quantum dots and the temperature of the hydrothermal reaction.

The invention discloses a synthesis method of a large-area two-dimensional composite nano-material. Firstly, an amine precursor is subjected to heating decomposition, and C3N4 nano sheets are synthesized; then, the synthesized C3N4 nano sheets, an amine solvent, cadmium salt and sulphonium salt are mixed with water, stirring and ultrasonic treatment are performed to make the mixture fully dispersed, and the large-area two-dimensional composite nano-material is obtained through heating reaction after centrifugation. According to the synthesis method, CdS nano sheets and the C3N4 nano sheets are compounded, the special two-dimensional composite material has a large-area contact interface and is advantageous to current carrier separation, the CdS nano sheets are matched with the C3N4 nano sheets in a band gap mode, the photocatalytic activity of the composite material is improved, and the composite material has excellent photocatalytic organic-matter degradation performance and photocatalytic hydrogen generation performance and is good in repeating performance and long in cyclic service life. The raw materials are low in cost, and the synthesis method is simple and convenient to operate and high in yield and has wide industrialization prospect.

The invention discloses a novel porous titanium metal-organic framework material for visible-light photocatalytic hydrogen generation and a preparation method thereof. The preparation method is characterized in that a series of tribasic carboxylic acid organic ligands are used as organic raw materials, titanium isopropoxide is used as a metal titanium source, through a solvothermal reaction, titanium ions and carboxyl groups are subjected to coordination and rearrangement to form polyoxotitanates, and the polyoxotitanates and the organic ligands are subjected to hexa-coordination to obtain thetitanium metal-organic framework material. In the preparation method, the solvothermal preparation method is simple, the yield is high, the product is pure, the crystallinity is high, the titanium metal-organic framework material obtained by using the method is large in specific surface area, has an excellent capacity of absorbing visible light and is capable of conducting photocatalytic water splitting to generate hydrogen, and the novel porous titanium metal-organic framework material has important environmental benefits and energy application values.

The invention relates to a carbonized bacterial cellulose-cadmium sulfide composite photocatalytic material as well as a preparation method and application thereof. The photocatalytic material is prepared by using the following methods: 1) inoculating Gluconacetobacter xylinus into a culture medium A, carrying out dynamic culture for 96 hours, collecting a bacterial cellulose product, washing, drying, and further carrying out vacuum freeze drying so as to obtain bacterial cellulose aerogel; 2) dissolving a fixed amount of thiourea and cadmium sulfide into ultrapure water, adding a proper amount of the bacterial cellulose aerogel, and carrying out a hydrothermal reaction at a high temperature and high pressure; 3) carrying out high-temperature calcining on the bacterial cellulose aerogel-cadmium sulfide compound product in a tubular furnace, thereby obtaining the carbonized bacterial cellulose-cadmium sulfide composite photocatalytic material. The preparation method provided by the invention has the advantages of being simple in operation, low in cost, and the like. The obtained carbonized bacterial cellulose-cadmium sulfide composite photocatalytic material can be used as a catalyst in water hydrogen generation of photocatalysis splitting.

The invention discloses a preparation method of a ZnO-CuO-FeOOH composite film for photoelectric catalysis hydrogen production. Firstly, ZnO solution is prepared, a ZnO seed layer is prepared by a dip-coating method, and a ZnO nano-rod film grows by a hydrothermal method. Secondly, a copper-based film is prepared on the ZnO nano-rod film by an electro-deposition method, and a CuO film is obtainedby heat oxidation. Finally, a FeOOH film is prepared on the ZnO-CuO film by the electro-deposition method to obtain the ZnO-CuO-FeOOH composite film. After various tests for the obtained ZnO-CuO-FeOOHcomposite film, light absorption of ZnO is improved, and photoelectric catalysis hydrogen production performance is improved. The preparation method is simple and easy to operate and has practical feasibility, and the prepared ZnO-CuO-FeOOH composite film is low in cost, free from pollution and good in photoelectric catalysis hydrogen production performance.

The invention relates to an in-situ transformation preparation method of an efficient C3N4-CdS composite photocatalytic material. The in-situ transformation preparation method comprises the following steps that (1) tripolycyanamide is dispersed in deionized water to form a uniform solution; (2) cadmium sulfide powder is uniformly dispersed in the tripolycyanamide solution uniformly, the cadmium sulfide powder and the tripolycyanamide solution mixed fully to achieve that tripolycyanamide is uniformly absorbed on the surface of the cadmium sulfide powder; (3) liquid obtained in Step 2 is transferred to a blast drying oven to be dried, and tripolycyanamide modified cadmium sulfide powder is obtained; and (4) the tripolycyanamide modified cadmium sulfide powder is put in a tube furnace and calcined, and the efficient C3N4-CdS composite photocatalytic material is obtained. The in-situ transformation preparation method has the benefits of being simple efficient and green when being used for synthesizing the photocatalytic material with the surface uniformly loaded with C3N4-CdS; interface transmission and sharp separation of photon-generated carriers are further facilitated; and the photocatalysis performance is further improved. In addition, the synthetic method is simple to operate, and requirements on equipment are low.

The invention provides a preparation method of a photocatalytic composite material, and relates to the technical field of catalysts. The preparation method comprises the following steps: (1) carryingout soaking pretreatment on plant leaves, thus obtaining template biomass; (2) mixing a molybdenum source-sulfur source water solution with the template biomass obtained in step (1), and immersing, thus obtaining a composite material precursor; (3) calcining the composite material precursor obtained in step (2), thus obtaining the photocatalytic composite material. The photocatalytic composite material is prepared from needle-like molybdenum sulfide and biomass carbon, wherein the needle-like molybdenum sulfide is loaded on the surface of the flaky biomass carbon; the content of the biomass carbon is 70 to 90 percent, and the content of the molybdenum sulfide is 10 to 30 percent. The photocatalytic hydrogen production performance of the photocatalytic composite material prepared by the invention is superior to that of a pure molybdenum sulfide material, excellent photocorrosion resistance is obtained, and the hydrogen production efficiency is just reduced by about 10 percent after circulating for thrice.

The invention belongs to the technical field of catalytic materials, and particularly relates to a nitrogen-doped two-dimensional dichalcogenide/sulfur-doped graphite phase carbon nitride composite material, and a preparation method and an application thereof. The nitrogen-doped two-dimensional dichalcogenide/sulfur-doped graphite phase carbon nitride composite material has a good photocatalytic hydrogen production performance, has a simple preparation method, can be prepared through a one-step reaction according to the method, simultaneously realizes double doping of graphite phase carbon nitride and molybdenum sulfide, and has a good reaction repeatability.

The invention belongs to the field of nano materials, the invention discloses a preparation method of a 2D porous TiO2 nanosheet photocatalyst rich in surface defects. The preparation method comprisesthe following steps: preparing graphene oxide by a Hummers method, preparing GO@Ti (OH) 4 by an oil bath method, preparing a 2D porous TiO2 nanosheet by calcining, and further preparing the 2D porousTiO2 nanosheet rich in surface defects by hydrogen reduction. Through cooperation of the 2D porous TiO2 nanosheet and defect engineering, active sites and edge sites of the nano photocatalyst are fully exposed, the recombination rate of photo-induced electron holes is reduced, the sunlight utilization rate is increased, and then the photocatalytic performance of the nano photocatalyst is improved. The material can be used for photocatalytic decomposition of water to produce hydrogen, which is of great significance to the development of clean energy.

The invention provides a surface gaseous penetration modification method of a nanometer titanium dioxide film photocatalyst, which relates to the penetration modification method of the nanometer titanium dioxide film photocatalyst. The invention solves the problem of low hydrogen production efficiency of the titanium dioxide film used for catalysis hydrogen preparation. The method of the invention comprises the following steps: using an anodic oxidation method for preparing the nanometer titanium dioxide film on a titanium substrate; then, heating a dripping penetration furnace to 500 to 800 DEG C; dripping methanol into the dripping penetration furnace for exhausting the air in the dripping penetration furnace; then, placing the treated titanium substrate into the dripping penetration furnace; and next, dripping penetration agents into the dripping penetration furnace. The method of the invention modifies the carbon, the carbon and the nitrogen, the carbon and the rare earth elements, or the carbon, and the nitrogen and the rare earth elements onto the surface of the nanometer titanium dioxide film and into the crystal lattices, the hydrogen production speed of the photocatalysis hydrogen production of the obtained modified nanometer titanium dioxide photocatalyst is 1.16 to 1.48 times of that of the titanium dioxide film without carrying out gaseous penetration treatment, and the photocatalysis hydrogen production performance is greatly improved.

The invention discloses a photocatalytic hydrogen production catalyst and a preparation method thereof. The catalyst is h-BN(x, t), 1/6<=x<=1/48, 30min<=t<=50min, x is the proportion of boric acid tourea, and t is microwave heating time. The preparation method includes the steps: sufficiently dissolving the boric acid to the urea by the aid of deionized water, drying mixture into a drying oven, and transferring steamed samples into a mortar to grind the samples; transferring the grinded samples into an aluminum oxide crucible with the volume of 25 milliliters, placing the whole samples into an aluminum oxide crucible with the volume of 50 milliliters, covering the samples by aluminum silicate, placing the samples into an aluminum oxide crucible with the volume of 200 milliliters, coveringthe samples with copper oxide, transferring the samples into a microwave oven to heat the samples for 30-50 minutes to obtain a finished product. The catalyst has good photocatalytic hydrogen production activity and practical application prospects.

The invention discloses a preparation method of zinc sulfide cadmium solid solutions with different morphologies, and belongs to the technical field of photocatalytic materials. The preparation methodcomprises the following steps: step 1, dissolving L-cysteine, Zn (Ac)2.2H2O and Cd (Ac) 2.2H2O in ethylene glycol or a mixed solution of ethylene glycol and deionized water, and vigorously stirring to form suspension; step 2, transferring the suspension into a polytetrafluoroethylene reaction kettle, heating for reaction, cooling to room temperature after the reaction is finished, centrifuging toobtain a precipitate, repeatedly washing the precipitate with deionized water and absolute ethyl alcohol respectively, and drying under vacuum to obtain the zinc sulfide cadmium solid solutions withdifferent morphologies. The preparation method is simple, the preparation period is short, and the technological process is easy to control. The Zn0.5Cd0.5S solid solution material prepared by the method has extremely high photocatalytic hydrogen production performance.

The invention discloses a two-dimensional titanium dioxide nanosheet catalytic material and a preparation method thereof. The thickness of the two-dimensional titanium dioxide nanosheet catalytic material is 3-10 nm, and the length of the two-dimensional titanium dioxide nanosheet catalytic material is 10-50 microns. The preparation method comprises the following steps: adding graphene oxide intoabsolute ethyl alcohol, and uniformly carrying out dispersing to obtain a graphene dispersion solution; adding tetrabutyl titanate into the graphene dispersion solution, and uniformly carrying out stirring; carrying out centrifuging, washing and drying on the mixed solution; and calcining the product to obtain an unmodified titanium dioxide nanosheet, adding the unmodified titanium dioxide nanosheet and ascorbic acid into deionized water, uniformly carrying out stirring, carrying out heating and reacting to obtain a brown initial product, and calcining the brown initial product to obtain the titanium dioxide nanosheet photocatalytic material. According to the method, firstly, ultra-thin two-dimensional TiO2 is prepared through a GO template method, and then reduction modification is carried out on the ultrathin two-dimensional TiO2 through the ascorbic acid, so that defects are introduced, and photocatalytic performance of the ultra-thin two-dimensional TiO2 is improved, namely, performance of hydrogen production by water photolysis of the ultra-thin two-dimensional TiO2 is greatly improved through great modification of the ultra-thin two-dimensional TiO2.

The invention belongs to the technical field of semiconductor antimony sulfide (Sb2S3) nanocrystalline and a photocatalysis hydrogen production performance testing method. The chemical formula of semiconductor antimony sulfide is Sb2S3, the molecular weight is 339.68, the structure is an orthorhombic crystal system, and the space group number is Pcmn (62); the crystal particle is in an irregular spherical shape, the crystal particle distribution is narrow, and the crystal particle is 6.5nm-11.5 nm, the average size obtained after Gaussian fitting is 8.67 nm, the chemical component is relatively uniform, the structure is single, the surface is pure, and the direct band-gap value of semiconductor antimony sulfide nanocrystalline is about 1.74eV. The semiconductor antimony sulfide nanocrystalline and the preparing method thereof and the photocatalysis hydrogen production performance testing method have the advantages that the adopted amorphous metal alloy method is a physical compounding method, and compared with a chemical preparing method, has the advantages of being easy to operate, low in equipment price and free of pollution to environment, and semiconductor antimony sulfide nanocrystalline is easy to produce in large scale and the like.