71results about How to "Reduce compounding efficiency" patented technology

The invention discloses an oxygen-doped carbon nitride/zinc oxide photo-catalyst as well as a preparation method and application of the oxygen-doped carbon nitride/zinc oxide photo-catalyst. The preparation method comprises the following steps: taking dicyandiamide or melamine as a precursor, calcining to prepare a carbon nitride nanosheet; adding a zinc oxide precursor into absolute ethyl alcohol, then adding dethylenetriamine, carrying out ultrasonic dispersion and subsequently enabling dispersion liquid to be subjected to hydrothermal reaction, so as to obtain zinc oxide nano material; enabling the zinc oxide nano material and the carbon nitride nanosheet to be subjected to ultrasonic dispersion in deionized water, subsequently adding hydrogen peroxide, then carrying out hydrothermal reaction again, and thus obtaining the oxygen-doped carbon nitride/zinc oxide photo-catalyst after the reaction is ended. The oxygen-doped carbon nitride/zinc oxide photo-catalyst adopts low-cost and easily available raw materials; the preparation condition can be easily achieved; the raw materials do not need to be calcined under the condition of high temperature, so that the cost for preparing the oxygen-doped carbon nitride/zinc oxide photo-catalyst is reduced, and the popularization and application of the preparation method are facilitated; meanwhile, the photo-catalyst is low in photo-production electron-cavity compounding efficiency and high in photo-catalytic activity.

The invention relates to a preparation method of a flower-like molybdenum disulfide and UiO-66 combined photocatalyst, wherein the method comprises the steps: by using zircon salt and an organic ligand as precursors and a polar solvent as a dispersing agent, preparing a white solid product, namely spherical UiO-66 nanoparticles, by a solvothermal method; then dispersing the spherical UiO-66 nanoparticles into distilled water to form a milk white solution; sequentially adding a molybdenum source and a sulfur source into the milk white solution, ultrasonically dissolving and stirring for 30 min,transferring into an autoclave with a polytetrafluoroethylene liner, heating at constant temperature, cooling to room temperature, and centrifugally separating to obtain a grey black product; and finally, washing the grey black product with absolute ethyl alcohol, and performing vacuum drying to constant weight to obtain the flower-like molybdenum disulfide and UiO-66 combined photocatalyst. Themethod is simple to operate, the raw materials are easy to obtain, the cost is low, and the obtained photocatalyst has excellent photocatalytic degradation performance.

The invention relates to a copper-iron layered double metal hydroxide, a copper-iron layered double metal hydroxide/carbon based composite material as well as preparation methods and application of the copper-iron layered double metal hydroxide and the composite material. The preparation method of the copper-iron layered double metal hydroxide includes the following steps: (1) dissolving a metal copper salt and a metal iron salt into deionized water to obtain a mixed solution; and (2) adding an alkaline reagent into the mixed solution, adjusting the pH to 5-7, and performing aging at 60-130 DEG C for 20-80 h to obtain the copper-iron layered double metal hydroxide.

The invention relates to a carbon-doped ultrathin bismuth tungstate nanosheet photocatalytic material and a preparation method thereof. The modified carbon-doped ultrathin bismuth tungstate nanosheet photocatalytic material is characterized by being doped with carbon and prepared by piling ultrathin flaky bismuth tungstate nanosheets bent and agglomerated to some degree. The novel visible-light responsive carbon-doped ultrathin bismuth tungstate nanosheet photocatalytic material is of a flaky structure, has more active sites and large specific surface area, excellent CO2 capturing capability and visible-light response and charge transfer capability and low photoproduced electron-hole pair compounding efficiency, the solar energy utilization rate is greatly improved, the material is used for photocatalytic reduction of CO2, and the photocatalytic reduction activity of the CO2 can be obviously improved.

The invention relates to a preparation method of a C-doped BiOBr microsphere photocatalyst. The method comprises the following steps: under constant-temperature high-speed dispersion conditions, slowly adding a bismuth salt solution into a sodium alginate dispersion solution, and carrying out dispersing at a high speed for 5-50 minutes; slowly adding a bromine salt solution into the system under ahigh-speed dispersion condition, and carrying out high-speed dispersion for 5-50 minutes; then transferring the reaction system into a high-pressure reaction kettle for a hydrothermal reaction so asto obtain a product; and subjecting the product to suction filtration separation, repeated washing with distilled water, and drying overnight to obtain the C-doped BiOBr microsphere photocatalyst. TheC-doped BiOBr microsphere photocatalyst is synthesized through a one-step hydrothermal reaction; the method is simple in process and low in cost; and the prepared C-doped BiOBr microsphere photocatalyst has good catalytic degradation performance on TC under simulated sunlight and has good application prospects in the field of photocatalytic degradation of antibiotic wastewater.

The invention belongs to the technical field of photovoltaic materials, and discloses a synthesis method and an application of a branched porphyrin-perylene diimide small molecule receptor. The porphyrin-perylene diimide small molecule solar cell receptor material has a structure represented by formula I, and pi in the formula I is benzene connected with a plurality of perylene diimides, triphenylamine, N-phenyloxazole, tetraphenylmethane or a tetraphenylsilane pi bridge. The branched porphyrin-perylene diimide organic small molecule photovoltaic acceptor material of the invention has an improved light-trapping ability, and can achieve good absorption complementation and energy level matching after being combined with a narrow bandgap polymer donor material PTB7-Th; and the small moleculereceptor can obtain a highest open-circuit voltage of 0.84 V and a highest photoelectric conversion efficiency of 7.7% when applied to an organic solar cell, so the porphyrin-perylene diimide small molecule receptor has a broad application prospect in the field of organic photovoltaics.

The invention provides a preparation method of a visible light catalyst. The preparation method comprises the following steps: weighing tetrabutyl titanate, ethanol, hydrazine hydrate and AgNO3, dispersing the tetrabutyl titanate in the ethanol, adding N2H4.H2O, ultrasonically dispersing in icy water bath for 0.5 to 1.5 h, forming TiO2 precursor sol, transferring the TiO2 precursor sol into a hydrothermal kettle, adding AgNO3 into the hydrothermal kettle at an ultrasonic state, reacting for 6 to 10 h at 160 to 200 DEG C, and obtaining the anatase TiO2/Ag visible light catalyst. Oxygen vacancyformed inside the TiO2 prepared by virtue of the reduction of N2H4.H2O is synergistic with Ag, so that the absorption spectral range of a sample is enlarged, the propagation rate and separation efficiency of photon-generated carrier can be improved, and the visible light catalytic efficiency can be increased. The oxygen vacancy is separately formed inside TiO2 and nano silver corresponding to thevisible light is carried on the surface of TiO2 by virtue of in-situ reduction reaction, and the preparation method is simple and easy to control.

The embodiment of the invention relates to fullerene carboxylic acid derivative/photosensitizer/titanium dioxide as well as a preparation method and application. The composite material is prepared from materials including titanium dioxide with -OH on surface, fullerene carboxylic acid derivative and a photosensitizer, wherein the fullerene carboxylic acid derivative is connected with titanium dioxide with -OH on surface by an ester bond, the photosensitizer is physically adsorbed to the surfaces of the fullerene carboxylic acid derivative and titanium dioxide, and the ester bond is formed by -COOH in the fullerene carboxylic acid derivative and -OH on the surface of titanium dioxide. The composite material can be used as a photocatalyst, and when being used as the photocatalyst, the photocatalyst is novel in structure, not only is the spectral absorption scope effectively widened, and light utilization efficiency increased, but also separation efficiency of electrons and holes is increased by fullerene, and great promotion of the photocatalysis performance is facilitated.

The invention discloses a preparation method of a composite visible light catalyst graphene quantum dot/graphite phase nitrogen carbide, and solves the problem that the efficiency of degrading NO by g-C3N4 under visible light is relatively low. The method comprises the following steps: by taking citric acid monohydrate CA as a raw material, pyrolyzing to prepare GQDs; then taking melamine as a raw material, and calcining to prepare CN (Carbon Nitride); and then preparing the g-C3N4 composite photocatalyst GQDs/CN containing the graphene quantum dots GQDs by using a one-step hydrothermal method. Compared with a pure g-C3N4 photocatalyst, the GQDs/CN has the advantages that the NO degradation capability is improved, and the selectivity for generating NO3 <-> is enhanced. A new thought is provided for application of the graphene quantum dot doped semiconductor catalyst in the field of environmental purification.

The invention discloses a pucherite-stannic oxide complex photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) dissolving tin chloride and bismuth nitrate in a nitric acid solution, fully stirring, and then preparing the solution into an acid mixed solution; dissolving ammonium metavanadate in a sodium hydroxide solution, fully stirring, and preparing an alkaline sodium vanadate solution; (2) under the stirring condition, dropwise adding the mixed solution into the sodium vanadate solution, so that a luminous yellow solution is generated; (3) dropwise adding an alkaline solution into the luminous yellow solution, adjusting the PH value to be above 8, performing supersonic vibration, and performing hydrothermal reaction on the mixed solution; (4) when a hydrothermal product is cooled to room temperature, cleaning by using deionized water, filtering, and drying, so that obtained powder is the pucherite-stannic oxide complex photocatalyst. The preparation method is simple, the cost is low, the repeatability is good, and the mass production requirement can be well met; the prepared photocatalyst can perform photocatalytic degradation on methyl blue under visible light.

The invention discloses a preparation method of a SrTiO3/SrSO4/Pt double-heterojunction nano material. The preparation method comprises the following specific steps: preparing deionized water, glacialacetic acid and absolute ethyl alcohol as solvents and preparing strontium nitrate and tetrabutyl titanate respectively as a strontium source and a titanium source, wherein the added cysteine not only serves as a chelating agent, but also serves as a sulfur source; then preparing a precursor by adopting a sol-gel method, drying theprecursor in a drying box at low temperature for 48 hours, grinding the precursor, and annealing the precursor in a muffle furnace to obtain composite powder of strontium titanate and strontium sulfate; and finally, depositing a layer of platinum on the surface through a photodeposition method to form as a cocatalyst, and thereby the SrTiO3/SrSO4/Pt double-heterojunction nano material is obtained. The SrTiO3/SrSO4/Pt double-heterojunction nano material disclosedby the invention has a porous structure and a relatively large specific surface area, and can provide more active sites for a photocatalytic reaction; besides, the SrTiO3/SrSO4/Pt has very high activity on the precipitation of H2 under the illumination. The nano-material shows great development prospect in the field of photocatalysis.

The invention discloses a supported photocatalyst containing Mn0.5Cd0.5S and Cu2O and a preparation method of the supported photocatalyst, and belongs to the field of inorganic functional materials. MoO2 and Cu2O are loaded on Mn0.5Cd0.5S to prepare the supported Mn0.5Cd0.5S photocatalyst, wherein the mass ratio of Mn0.5Cd0.5S to MoO2 to Cu2O is 1:(0.005-0.03):(0.005-0.03). In the present invention, Cu2O and Mn0.5Cd0.5S form a p-n heterojunction; and MoO2 is added into the composite photocatalyst as a cocatalyst, so that the electron-hole composite efficiency is reduced, migration of Mn0.5Cd0.5S conduction band electrons is facilitated, the photocatalytic activity of the supported catalyst is greatly improved, and the hydrogen production rate is as high as 170.366 [mu]mol*h<-1>.

The invention discloses a nitrogen vacancy and hydroxyl synergistically modified graphite phase carbon nitride photocatalyst as well as preparation and application thereof in photocatalytic hydrogen production. The preparation method comprises the following steps: mixing melamine and oxalyl dihydrazine, and calcining to obtain nitrogen vacancy modified g-C3N4; carrying out ultrasonic mixing on thenitrogen vacancy modified g-C3N4 and ammonia water, and then carrying out hydrothermal reaction to obtain the nitrogen vacancy and hydroxyl synergistically modified g-C3N4 photocatalyst. According tothe catalyst, the hydrogen production rate of the g-C3N4 photocatalyst is increased through the synergistic effect of nitrogen vacancy and hydroxyl on photo-induced electron holes, wherein the maximum H2 yield can reach 107.4 micromoles/g*h. The preparation method of the catalyst is simple, low in cost and beneficial to large-scale production.

The invention discloses a composite catalyst as well as a preparation method and application thereof. The composite catalyst is formed by hybridizing graphene oxide (GO) and bismuth oxychloride (BiOCl) nanosheets. The preparation method comprises the following steps: uniformly dispersing graphene oxide into an ethanol solution; dissolving polyvinylpyrrolidone in the mixed solution, centrifuging the mixture to remove the supernatant, and re-dispersing the supernatant in the ethanol solution; dissolving Bi(NO3)3.5H2O into a mannitol solution, uniformly mixing the components, adding a saturated sodium chloride solution after uniformly mixing the two mixed solutions, transferring the mixed solutions into a polytetrafluoroethylene substrate reaction kettle, and carrying out hydrothermal heating; and centrifuging, washing and drying the reaction product to obtain the catalyst, named as GO-BiOCl (001). Under the condition of low-temperature plasma, the GO-BiOCl (001) catalyst generates activespecies with extremely high oxidability under the collision excitation of high-energy electrons, so that efficient purification of VOCs pollution gas is realized.

The invention discloses a three-dimensional carbon fiber preform enhanced yttrium oxide-aluminum oxide complex-phase ceramic composite material and a preparation method thereof. The composite materialcomprises a three-dimensional carbon fiber preform and yttrium oxide-aluminum oxide complex-phase ceramic, in the yttrium oxide-aluminum oxide complex-phase ceramic, the molar content of Al2O3 is 5%-95%, pores of a three-dimensional carbon fiber preform are uniformly filled with the yttrium oxide-aluminum oxide complex-phase ceramic, and the porosity of the three-dimensional carbon fiber preformenhanced yttrium oxide-aluminum oxide complex-phase ceramic composite material is 10%-15%. The preparation method comprises the following steps; (1) preparing yttrium oxide-aluminum oxide composite sol; (2) carrying out dipping; (3) drying; (4) carrying out heat treatment; and (5) repeating a dipping-drying-heat treatment process in the step (2)-step (4). The composite material has the advantagesof low porosity, high compactness, high temperature resistance, oxidation resistance, excellent mechanical property and the like. The preparation method is high in preparation efficiency, and the compactness and mechanical property of the prepared composite material are improved remarkably.

The invention discloses a Fe (III) cluster/bismuth oxyiodide composite photocatalytic material and a preparation method and application thereof. The photocatalytic material comprises defective bismuthoxyiodide and Fe (III) clusters loaded thereon. The preparation method comprises the following steps: preparing a bismuth oxyiodide monomer; preparing defective bismuth oxyiodide through calcination;and preparing the photocatalytic material through water bath reaction. The photocatalytic material has the advantages of wide photoresponse range, low photo-generated electron and hole recombinationefficiency, high catalytic performance, good stability, good reusability, simplicity in recycling, high recycling rate and the like, can be widely used for treating pollutants in the environment, andhas high use value and good application prospect. The preparation method has the advantages of being simple in process, convenient to operate, low in raw material cost, less in energy consumption, short in time consumption, mild in reaction condition, easy to control, environment-friendly and the like, and the prepared material is high in crystallization degree, unchanged in property and good in application prospect.

The invention relates to preparation and application of a carbon dot modified graphite-phase carbon nitride hollow sphere photocatalyst, and belongs to the technical field of material preparation andphotocatalysis. The photocatalyst is obtained by taking a mixture of a graphite-phase carbon nitride precursor and a carbon dot precursor as a precursor of a product and mesoporous silica as a hard template through an in-situ thermal polymerization and template etching method, and the photocatalyst is applied to a photocatalytic reaction. The carbon dot modified graphite-phase carbon nitride prepared by the method has a hollow sphere structure, uniform material particle size and good visible light absorption capability. Compared with a traditional carbon nitride material, the material has a large specific surface area and a high sunlight absorption and utilization rate, and can show efficient photocatalytic performance under visible light. The material provided by the invention is simple in preparation method, high in catalytic efficiency and low in price, meets actual production requirements and has a wide application prospect.

The invention discloses a supported photocatalyst containing Mn0.5Cd0.5S and Au and a preparation method of the supported photocatalyst, and belongs to the field of inorganic functional materials. MoO2 and Au are supported on the Mn0.5Cd0.5S to prepare a supported photocatalyst Mn0.5Cd0.5S/MoO2/Au, wherein the mass ratio of the Mn0.5Cd0.5S to the MoO2 to Au is 1:(0.005-0.03):(0.01-0.04). Accordingto the preparation method, the MoO2 is added into the Mn0.5Cd0.5S as a cocatalyst, so that the electron-hole recombination efficiency is reduced; due to the introduction of the nano Au particles, thenano Au particles and a Mn0.5Cd0.5S/MoO2 system can form surface plasma resonance to enhance light absorption, migration of Mn0.5Cd0.5S conduction band electrons is facilitated, the photocatalytic activity of the supported catalyst is greatly improved, and the hydrogen production rate is as high as 108.154 [mu]mol h<-1>.

The invention belongs to the technical field of photocatalytic hydrogen production, and relates to an Ag-In-Zn-S quantum dot, in particular to a method for modifying the Ag-In-Zn-S quantum dot by a ferrocene derivative, which comprises the following steps: dispersing the Ag-In-Zn-S quantum dot in a ferrocene derivative solution with dimethyl sulfoxide as a solvent, carrying out uniform ultrasonic treatment, and carrying out hydrothermal reaction at 90-130 DEG C for 2-4 hours, wherein the mass ratio of the ferrocene derivative to the Ag-In-Zn-S quantum dots is (0.25-1) to 100. The prepared ferrocene derivative modified Ag-In-Zn-S quantum dot is good in dispersity and high in stability, and can be applied to photocatalytic hydrogen production. The photocatalytic performance and the stability of the AIZS quantum dots are improved by adopting a functional ligand quantum dot hydrothermal post-treatment mode, wherein hydrogen production rate of quantum dot visible light photocatalytic decomposition water is one time of that of pure synthesized quantum dots; after four times of circulation, the hydrogen production amount is not reduced at all, which shows that the quantum dot has good stability. In addition, the method is simple in process, low in cost, easy to obtain, convenient for batch production, non-toxic and harmless, and meets the environment-friendly requirement.

The present invention relates to a Cu ₂ The invention discloses a method for preparing an O/ZnO composite photocatalyst, belonging to the technical field of photocatalysts. In the present invention, copper salt and zinc salt are dissolved in water to obtain a mixed salt solution; under stirring conditions, the precipitant solution is dropped dropwise into the mixed salt solution to react until the pH value is 7 to 7.5 to obtain a reaction system, and the reaction system is filtered to obtain copper Zinc hydroxide solid; add the reducing agent to the mineralizer solution to obtain a reduction-mineralization solution, add copper-zinc hydroxide solids to the reduction-mineralization solution, and react hydrothermally at a temperature of 120~160°C More than 12h, naturally cooled to room temperature, filtered to obtain Cu ₂ O/ZnO solid; Cu was washed repeatedly with deionized water and absolute ethanol ₂ O/ZnO solid to the pH value of the washing solution is 7~7.5, filtered to obtain Cu ₂ O/ZnO powder, dry to get Cu ₂ O/ZnO photocatalyst. The present invention Cu ₂ The composite powder of the O/ZnO composite photocatalyst has small particles, high recycling rate, good dispersion, high photocatalytic efficiency, simple synthesis method, easy operation, short reaction time and low cost.