73results about How to "Meets friendly requirements" patented technology

The invention belongs to the technical field of preparation of inorganic nano-materials and environmental materials, relates to a preparation method of tungsten trioxide nano-sheets,, in particular to a tungsten trioxide nano-sheet prepared by hydrothermal method and application of the tungsten trioxide nano-sheet. The invention aims to provide a preparation method of tungsten trioxide nano-sheets, which has a simple process and reduces the synthesis temperature. The preparation of tungsten trioxide nano-sheets with relatively homogeneous patterns through liquid-phase hydrothermal reaction at a low temperature is implemented by stirring mixing a dilute nitric acid solution and a sodium tungstate solution to form tungstic acid precipitates and then performing hydrothermal method. Tungsten trioxide (WO3) prepared throughsimple hydrothermal synthesis reaction has a sheet-like nano-scale structure pattern and is advantageous in good chemical stability. The method has a simple process and good reproducibility. All used raw materials are inorganic compounds which are cheap and abundant and conform to the requirement for environmental friendliness. The method does not need calcination and other pretreatment processes at high temperatures and reduces the synthesis temperature, so as to reduce the energy consumption and reaction cost and to facilitate the mass production.

The invention provides a water-based cleaning agent for electronics and a preparation method thereof. The water-based cleaning agent comprises the following ingredients in percentage by weight: 20-50% of glycol ethers, 25-40% of propylene glycol ethers, 15-25% of alcamines, 0-0.5% of corrosion inhibitor and 10-15% of surfactant. According to the water-based cleaning agent provided by the invention, the efficiency of cleaning lead-free soldering residues can be increased, and the requirements for environment friendliness are met, so that the cleaning agent can safely pass through a variety of test applications. The water-based cleaning agent provided by the invention is also applied to the SMT (Surface Mounting Technology) industry, e.g. the fields of PCBA (Printed Circuit Board Assembly), furnace fixtures, equipment, screen plates, steel meshes and the like and has an excellent cleaning effect.

The invention belongs to the technical field of nanometer material, relates to a synthetic method for preparing porous hollow nanospheres with uniform appearance through a hydrothermal process, and particularly relates to a preparation method of porous nickel selenide hollow nanospheres. The preparation method comprises the steps as follows: positioning selenium dioxide and nickel nitrate into alkaline aqueous solution of ammonia water; and preparing the porous hollow nanospheres through the hydrothermal process under the reduction effect of hydrazine hydrate. The nickel selenide hollow nanospheres prepared by the preparation method provided by the invention have the diameter of 300 to 400nm, and are formed by self-assembling 30 to 50nm of porous nickel selenide. The preparation method provided by the invention is simple in technology, and high in repeatability; and the used nickel source and selenium source are the inorganic compounds, low in cost, easy to obtain, low in cost, and meets the environment-friendly requirement; the method can be conducted without pre-processing such as ageing and roasting; the resultant temperature is low, therefore, the energy consumption and the reacting cost are reduced; and the mass production can be conveniently conducted.

The invention belongs to the technical field of photocatalysis, in particular to a preparation method and application of a visible-light responsive ternary composite photocatalyst. The method comprises the following steps: dissolving NGQDs and g-C3N4 / Bi2WO6 into deionized water, stirring at a room temperature to obtain an NGQDs@g-C3N4 / Bi2WO6 composite nano-material. The introduced NGQDs is used as a collector of dual-function electrons-holes, so that electrons produced by visible-light induced g-C3N4 are transferred to NGQDs, and holes produced by visible-light induced Bi2WO6 are transferred to NGQDs; oxidation-reduction reaction on the electrons-holes is further carried out, so that the separation efficiency of the electrons-holes is improved finally, and the photocatalytic activity is enhanced.

The invention belongs to the field of preparation of a metal organic framework material, and relates to a preparation method of a novel adsorption material carbon nano-tube / UiO-66-NH2. The preparationmethod comprises the following steps: firstly, performing acidizing treatment on a multi-wall carbon nano-tube to ensure that carboxyl located at the defect sites of the carbon nano-tube is functionalized and then a coordinate bond is formed by simultaneously an organic ligand and metal ions, and performing self-assembly to form a nano-composite material. The carbon nano-tube participates in theUiO-66-NH2 material in a form of physical blending, and the carbon nano-tube / UiO-66-NH2 composite material is also formed in a form of chemical bond. Because addition of the carbon nano-tube, the water stability of the metal organic framework material is obviously improved, and the heat stability, the specific surface area and the pore volume aperture of the composite material are all improved toa certain extent, and thus, the composite material has more excellent adsorption performance. The preparation method is simple and effective, and a new way is provided for preparing the nano-tube / MOFscomposite material.

The invention relates to the technical field of photocatalytic hydrogen production, particularly to an AgIn5S8-ZnS quantum dot, a preparation method and uses thereof, wherein the AgIn5S8-ZnS quantum dot can be used for photocatalytic hydrogen production under visible light. The preparation method comprises: weighing silver nitrate, indium nitrate, zinc acetate and different amounts of L-cysteine,mixing and dissolving in an aqueous solution, adjusting the pH value of the solution to 8.5 with NaOH, adding thioacetamide, carrying out ultrasonic stirring, adding MPA corresponding to different amounts of L-cysteine, stirring, carrying out a hydrothermal reaction for 4 h at a temperature of 110 DEG C, and carrying out ethanol centrifugation washing drying after completing the reaction to obtainthe AgIn5S8-ZnS nanometer crystal. According to the present invention, the visible light-irradiated water decomposition hydrogen production experiment results prove that the prepared mixed ligand catalyst has good photocatalytic activity.

The invention belongs to the technical field of preparation of inorganic nanomaterials and environmental materials, and relates to a solvothermal preparation method of bismuth trioxide microspheres and application thereof. The solvothermal preparation method of the bismuth trioxide microspheres adopts the technical steps as follows: dissolving soluble bismuth salt into ethylene glycol and dissolving soluble indium salt and urea into ethanol respectively; performing ultrasonic agitation and uniformly mixing, and obtaining a precursor through solvothermal reaction; centrifugally washing and drying the precursor, and roasting the precursor at high temperature to prepare the bismuth trioxide microspheres. The bismuth oxide (Bi2O3) microspheres with relatively uniform morphology are prepared at a low temperature through the solvothermal reaction by a liquid-phase method, the morphology thereof is a microspherical structure, and the diameter thereof is about 1-2 microns. When the bismuth trioxide microspheres prepared according to the solvothermal preparation method method can be applied to optical degradation of tetracycline-containing wastewater, and have the advantages of high chemical stability and the like. The solvothermal preparation method is simple in process and high in repeatability; used raw materials meet environment-friendly requirements; and by the solvothermal preparation method, mass production can be facilitated.

The invention relates to I-III-VI group 2 sulfide and particularly relates to an AgIn5S8-ZnS / MoS2 heterojunction composite photocatalyst prepared by utilizing a simple and rapid hydrothermal method. The AgIn5S8-ZnS / MoS2 heterojunction composite photocatalyst can be used for degrading a rhodamine B dye under visible light. The AgIn5S8-ZnS / MoS2 heterojunction composite photocatalyst is prepared by mixing and stirring AgIn5S8-ZnS nano crystals, ammonium molybdate tetrahydrate and thiourea, carrying out a hydrothermal reaction for 8 hours at 200 DEG C, and filtering, washing and drying after the reaction is finished, wherein the mass ratio of the MoS2 to the AgIn5S8-ZnS nano crystals is 1%-30%, and the optimal mass ratio of the photocatalytic performance is 5%. An experiment of degrading rhodamine B (RhB) under the visible light shows that the prepared composite photocatalyst has good photocatalytic activity.

The invention belongs to the technical field of nano composite materials and relates to a synthesis method of a BiVO4-Ni / Co3O4 heterojunction. The synthesis method comprises the following steps of: growing a layer of BiOI nanoparticles on an FTO substrate by adopting an electro-deposition method; dropwise adding a vanadyl acetylacetonate aqueous solution on the surface of the FTO; performing calcining at a high temperature to generate bismuth vanadate (BiVO4); obliquely placing FTO in a deionized water solution containing Co (NO3) 2.6 H2O, Ni (NO3) 2.6 H2O, C6H12N4, CH4N2O and NH4F through continuous ion adsorption reaction; performing hydrothermal reaction at 120-200 DEG C for 2-5 hours, taking out an obtained product, cleaning the product with deionized water; annealing the product at 300-500 DEG C for 1.5-3 hours; and naturally cooling the product to room temperature to obtain the BiVO4-Ni / Co3O4 heterojunction. The prepared heterojunction is used as a photoelectrode to be applied tophotoelectrochemical hydrolysis reaction. According to the preparation method, a simple electro-deposition method and a hydrothermal method are utilized, therefore, the method is simple in operationand has good repeatability; the used materials are low in cost, large in reserves and non-toxic, and meets the requirement for environmental friendliness; the prepared material can significantly reduce the interface reaction barrier, effectively inhibit solid-liquid interface charge recombination, accelerate water oxidation reaction kinetics and improve the photocurrent density so as to better utilize solar energy.

The invention belongs to the technical field of a composite electrode material. The NiCo2O4 / MoS2 composite electrode material is synthesized by a two-step hydrothermal method and can be used for researching performance of a two-electrode system. The NiCo2O4 / MoS2 composite electrode material is synthesized by the moderate two-step hydrothermal method, foamed nickel is used as a substrate, a synthesis material is directly grown on the foamed nickel, an adhesive is prevented from being used, the material impedance is reduced, and meanwhile, the material conductivity is improved to a great extent by the foamed nickel substrate; and generally, the conductivity of a transition metal oxide (NiCo2O4) is lower than that of a sulfide (MoS2), the cycle stability of the NiCo2O4 is also relatively low, while the theoretical capacity of NiCo2O4 is relatively high. Therefore, by combining the NiCo2O4 and the MoS2 to form the composite electrode material, the conductivity and the cycle stability of the material can be effectively improved, and high specific capacitance of the material is simultaneously maintained.

The invention belongs to the technical field of nanometer material synthesis and relates to a "Z-Scheme" Co3O4 / g-C3N4 composite system which is synthesized by one step by using a simple and rapid hydrothermal method and can be used for degrading tetracycline hydrochloride under visible light, wherein the surface of g-C3N4 is modified by a mesoporous Co3O4 nanosphere composed of monocrystal nanodots in the system. A sample is prepared by the steps: firstly, preparing g-C3N4 for later use; and then, controllably preparing the "Z-Scheme" Co3O4 / g-C3N4 composite system, accurately weighing a certain quantity of cobaltous nitrate hexahydrate and cetyltrimethyl ammonium bromide, dissolving cobaltous nitrate hexahydrate and cetyltrimethyl ammonium bromide into a mixed solution of deionized water and methanol, then, adding g-C3N4, carrying out magnetic stirring for 24h after carrying out ultrasonic dispersion for 30min, then, transferring a suspension liquid into a 50ml high-pressure reactor, carrying out reaction in a baking oven at 180 DEG C for 24h to obtain a dark yellow sediment, and then, carrying out centrifuging, cleaning and drying.

The invention discloses a preparation method of Fe2O3 / nd-g-C3N4 composite material and belongs to the technical field of preparation of an environment-friendly material. The preparation method comprises the following steps: 1) preparing a coarse product of Fe2O3 / nd-g-C3N4; 2) preparing a product of Fe2O3 / nd-g-C3N4; 3) preparing Fe2O3 / nd-g-C3N4 composite material. According to the preparation method of Fe2O3 / nd-g-C3N4 composite material, the composite material of Fe2O3 and nd-g-C3N4 is synthesized by calcination. The method has the advantages of simple and safe technology, cheap and easily available raw materials, no toxin or harm, convenience in batch production and compliance to environmental friendliness requirement. The invention also aims to provide application of the visible-light response Fe2O3 / nd-g-C3N4 composite material, wherein the composite material is used to degrade RhB under visible light, while excellent photocatalytic activity is shown through the degradation of RhB under visible light.

The invention belongs to the field of environmental materials, and discloses a method for preparing UiO-66 based on benzoic acid regulation and chloroform activation and adsorption application thereof. UiO-66 (UiO-66-BA) having a perfect octahedral structure is successfully synthesized by using benzoic acid as regulator and chloroform as an activator, and is proved by using X-ray diffraction (XRD)and Fourier transform infrared spectrum (FTIR) and the like. An adsorption Congo Red dye (CR) experiment proves that the UiO-66-BA material added with benzoic acid and chloroform has high-efficient adsorption performance, has the maximum adsorption capacity of 1371mg / g, which is 7 times that of an unmodified UiO-66 on CR adsorption under the same condition. The method provides important standardto MOF finely synthesized nano-structural materials, the crystal appearance of a material can be regulated, the adsorption performance of the material can be improved, and organic pollutants can be better degraded.

The invention relates to a method for preparing bismuth trioxide (Bi2O3) nanotubes by a microwave-assisted liquid-phase process and application of the bismuth trioxide (Bi2O3) nanotubes in photodegradating tetracycline-containing wastewater. The preparation method comprises the following steps: magnetically stirring proper amounts of Bi(NO3)3.5H2O and Na2SO4 to form a mixed solution, carrying out ultrasonic dispersion on NaOH and deionized water to form a sodium hydroxide transparent solution, and dropwisely adding the sodium hydroxide transparent solution into the Bi(NO3)3.5H2O / Na2SO4 mixed solution; and continuously heating in a reactor with the microwave power of 800W to obtain the product, centrifuging, washing and drying to obtain the bismuth trioxide (Bi2O3) nanotubes with uniform appearance. The invention has the advantages of simple technique and reproducibility; and the raw materials are cheap and accessible inorganic compounds, are low in cost, do not need pretreatment of high temperature and calcining, and have the advantages of low synthesis temperature and short reaction time, thereby lowering the energy consumption and reaction cost and facilitating the mass production. Since the bismuth trioxide (Bi2O3) has strong photocatalytic degradation capacity for tetracycline, the invention is feasible in practical application.

The invention belongs to the technical field of visible light catalysis and relates to a TiO2 / CN23 photocatalyst and a preparation method and application thereof The invention is intended to modify g-C3N4 photocatalyst and apply the modified catalyst to the treatment of eutrophicated raw water. A modifying method herein includes: mixing g-C3N4 made with urea, and g-C3N4 made with melamine to the ratio of 2:3 so as to obtain a CN23 and TiO2-support to prepare TiO2 / CN23. TiO2 / CN23 has regular crystal form, and is in bead shape, gathering together. The main structure of the crystal is g-C3N4 andTiO2 particles embedded in the surface of g-C3N4; g-C3N4 can inhibit TiO2 aggregation so that TiO2 is dispersed, light can be fully absorbed, and catalytic efficiency is improved. The preparation process of the catalyst herein is simple, the conditions are mild, the stability is good, the cost is low, and the catalyst has the advantages of high catalytic efficiency, good environmental friendlinessand energy efficiency, zero toxicity and pollution and the like, meets the requirement on environmental friendliness and has a promising application prospect.

The invention belongs to the technical field of photocatalyst preparation, and particularly relates to a visible light responsive heterojunction composite material and a preparing method and use thereof. The method includes firstly subjecting Bi(NO3)<3>.5H2O to ultrasonic dispersion into ethylene glycol to obtain a solution A; then dissolving NH4Cl into deionized water to obtain a solution B; adding the solution B into the solution A to generate white turbid liquid C; adding dropwise a NaOH solution into the white turbid liquid C to obtain a solution D; transferring the solution D into a reaction kettle; performing hydrothermal treatment at 160 DEG C for 12 h; after the reaction kettle is cooled to room temperature, washing a sample with water and ethanol and drying the sample to obtain solid powder E; and finally adding the solid powder E into a muffle furnace, raising the temperature to 500 DEG C, roasting the powder for 5 h to finally obtain Bi3O4Cl / Bi<12>O<17>Cl<2> nanosheets whichshow excellent photocatalytic activity in 2,4-dichlorophenol under visible light.

The invention relates to a g-C3N4 / Ni-HRP composite photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of nano material synthesis. The preparationmethod comprises the following steps: preparing g-C3N4 for later use; loading metal Ni and horse radish peroxidase (HPR) on the surface of a graphite-phase carbon nitrode (g-C3N4) through a simple and effective drop-wide adding and stirring way to form a g-C3N4 / Ni-HRP composite photocatalyst system which can realize effectively degrading various phenol pollutants under visible light. According tothe experimental results, the system has photocatalytic degradation efficiency of 100% for various phenol pollutants under the visible light, and has relatively high stability.

The invention discloses an Mn-C catalytic material based on MOFs as well as a preparation method and application thereof. A main body part of the Mn-C catalytic material is C, the structure is a three-dimensional porous skeleton structure, and Mn atoms are uniformly loaded on a C framework. The preparation method comprises the steps that Mn-MOFs are prepared through a hydrothermal method, and Mn-Cis prepared through Mn-MOFs carbonization. Compared with a traditional catalyst, the Mn-C retains the framework of MOFs, the specific surface area is large, Mn atoms are uniformly dispersed on the Cframework, sufficient contact with a catalyzed substance is facilitated, the catalytic effect is enhanced, and excellent hydrophobic performance is achieved. Mn-C is further loaded on coarse-effect filter cotton and can be directly used for an air purifier.

The invention provides a preparation method and use of yttrium-doped bismuth stannate nanocrystallines. A semi-conductor material can be used for visible-light degradation of organic pollutants and particularly can be used for visible-light degradation of tetracycline. The preparation method comprises the following steps: bismuth nitrate and yttrium nitrate are mixed in dilute nitric acid to be uniformly mixed, then a sodium stannate solution is added, ultrasonic treatment is conducted till a milk white mixed solution is obtained, the pH is adjusted with an NaOH solution, and finally the yttrium-doped bismuth stannate nanocrystallines are prepared by the one-step hydrothermal method. The yttrium-doped bismuth stannate nanocrystallines have the advantages of being stable in property, nontoxic and the like, the raw materials are low in price and easy to obtain, the cost is low, the environment-friendly requirement is satisfied, the reaction time is relatively short, accordingly, the energy consumption and the reaction cost are lowered, and volume production is facilitated; a yttrium-doped bismuth stannate nanocrystalline catalyst has relatively strong photocatalytic degradation ability, and can achieve the degradation effect of 80.0% when being used for photocatalytic degradation of tetracycline, thereby having a very high practical application value.

The invention provides a cleaning agent for electronics and a preparation method thereof. The cleaning agent comprises the following ingredients in percentage by weight: 10-40% of low-molecular-weight alcohols, 30-50% of methyl siloxane and 30-40% of low-molecular-weight ketones. According to the cleaning agent provided by the invention, the efficiency of cleaning lead-free soldering residues can be increased, and the requirements for environment friendliness are met, so that the cleaning agent can safely pass through a variety of test applications.

The invention belongs to the technical field of microbial denitrification, and discloses an acid-resistant and alkali-resistant aerobic denitrifying bacterium capable of rapidly denitrifying, a microbial agent and application thereof, the aerobic denitrifying bacterium is a Pseudomonas plecoglossa strain ZY-3, is preserved in Guangdong Microbiological Culture Collection Center (GDMCC) on January 4, 2022, and has a preservation number of GDMCC No: 62181; the strain and the inoculant have the heterotrophic nitrification and aerobic denitrification capabilities at the same time, the growth speed is high, the nitrogen reduction rate is high, and the strain and the inoculant can be respectively utilized and used as a unique inorganic nitrogen source for aerobic nitrification and denitrification nitrogen removal. The strain and the microbial inoculum can play a nitrification-denitrification role in a water body environment with the pH value of 5.5-10.5, and meanwhile, the strain and the microbial inoculum have good biological safety.

The invention belongs to the technical field of nano materials and provides a g-C3N4 / MnWO4 heterojunction photo-catalyst which is prepared with sodium tungstate, manganese chloride and melamine as raw materials and through a thermal treatment method. The photo-catalyst is used for degrading an organic pollutant Rhodamine B under visible light and has great significance on environment protection.

The invention relates to a preparation method and an application of a nonmetal BCN / g-C3N4 Van der Waals heterojunction photocatalyst. A convenient and efficient calcination synthesis technology is utilized to perform secondary calcination on a BCN nanosheet obtained by one-step calcination and g-C3N4, so that the BCN nanosheet is compounded on the surface of the g-C3N4 to form the BCN / g-C3N4 Van der Waals heterojunction photocatalyst with a stable structure; and the photoatalyst achieves stable and efficient hydrogen production by photolysis of water under visible light. The BCN / g-C3N4 Van derWaals heterojunction photocatalyst prepared in the invention has high stability and reusability; and additionally, the method has the advantages of simplicity, low cost, greenness, non-toxicity, veryhigh practical values and very high application prospect.

The invention discloses a preparation method of visible light-responsive Fe3O4 quantum dot-modified BiOCl / BiVO4 and belongs to the technical field of preparation of semiconductor materials. The preparation method comprises the following steps: 1) preparation of a BiOCl / BiVO4 photo-catalyst with a one-step hydrothermal method; 2) preparation of the visible light-responsive Fe3O4 quantum dot-modified BiOCl / BiVO4: mixing FeCl3.6H2O and the BiOCl / BiVO4 photo-catalyst prepared in the step 1), adding into deionized water, stirring to form a solution A; meanwhile, dispersing FeCl2.4H2O of the same molar mass in deionized water, stirring to form a solution B, and dropwise adding the solution B in the solution A; continuously adding concentrated ammonia water in the solution A while stirring for areaction; collecting through a magnet, washing and then drying to obtain the visible light-responsive Fe3O4 quantum dot-modified BiOCl / BiVO4. The preparation method disclosed by the invention has thebenefits that a Fe3O4QDs-BiOCl / BiVO4p-n heterojunction is prepared by utilizing the simple and quick method, the heterojunction shows excellent photo-catalytic activity when used for degrading a variety of antibiotics under visible light, and a sample has relatively strong magnetism and is easy to recover and reuse; meanwhile, the preparation method reduces the energy consumption and the reactioncost, is convenient for mass production, non-toxic and harmless, and environmentally-friendly.

The invention discloses a preparation method of tubular g-C<3>N<4> with a visible-light response function and belongs to the field of photocatalytic semiconductor material preparation technologies. The preparation method comprises the steps that (1) melamine and cyanuric acid are mixed and dissolved in ultrapure water according to an arbitrary proportion, magnetic stirring is performed, and a uniform mixed solution is formed; (2) then, the solution is transferred to a stainless steel autoclave for a reaction, and a precursor of a synthetic product is obtained; (3) the obtained precursor is dried after being washed with ultrapure water; and (4) after the dried precursor is calcined in nitrogen, the tubular g-C<3>N<4> with the visible-light response function is obtained. According to the preparation method, the one-dimensional tubular g-C<3>N<4> is prepared through high-temperature calcination, band gap width of the tubular g-C<3>N<4> is remarkably reduced, visible-light response of thetubular g-C<3>N<4> is improved, and the charge transport capability of the tubular g-C<3>N<4> is enhanced through a tube separation mode; and application of the tubular g-C<3>N<4> with the visible-light response function in the photocatalytic field comprises degradation, hydrogen production, nitrogen fixation, bacterial resistance and the like.

The invention discloses a method for preparing thickness-adjustable BiOCl at room temperature,and belongs to the technical field of photocatalytic semiconductor material preparation. The method comprises the following steps: dispersing Bi(NO<3>)<3>*5H<2>O and mannitol in ultrapure water, and stirring until Bi(NO<3>)<3>*5H<2>O and mannitol are completely dissolved to obtain a clear water solution;and adding a chloride solution, stirring, centrifuging an obtained precipitate, repeatedly washing with ultrapure water and ethanol, and drying to obtain the BiOCl photocatalytic material, namely theBiOCl with adjustable thickness. According to the method for preparing the BiOCl with adjustable thickness at the room temperature, the BOCl nanosheets with adjustable thickness prepared through a simple and rapid method shows excellent photocatalytic activity in degradation of tetracycline under visible light. The method has the advantages of very simple process, low price, easy availability, lowcost and short reaction time, thereby reducing the energy consumption and reaction cost, being convenient for batch production, being non-toxic and harmless, and meeting the environment-friendly requirements; the thickness-adjustable BiOCl prepared at room temperature can degrade tetracycline pollution under the condition of visible light.

The invention belongs to the technical field of synthesis of a photocatalyst, and in particular relates to a mesoporous photocatalyst, and a preparation method and application thereof. The double doped Cu / Cl-g-C3N4 mesoporous photocatalyst is prepared by precisely controlling the reaction condition and the quantity of reactants; and the characterization result indicates that after pure g-C3N4 is doubly doped with metal Cu and non-metal Cl, the inherent mesoporous structure feature of the g-C3N4 is not changed, the specific surface area and the surface active sites are increased, the response range on visible light is expanded and the separation efficiency of current carriers is improved.

The invention belongs to the technical field of electrochemistry, and relates to bimetal nano material synthesis, in particular to a method for synthesizing a copper-indium / carbon bimetal nano material through a one-step reduction method. The method comprises the steps that indium chloride and copper chloride are dissolved in a diluted hydrochloric acid solution, the mixture is transferred into anisovolumetric sodium citrate water solution, carbon black is added during stirring, and ultrasonic dispersion is conducted; evenly-scattered suspension liquid in an ice bath is sharply stirred, a freshly-prepared sodium borohydride solution is slowly dripped in, stirring at the intermediate speed is conducted for 1-3 h, products are centrifuged and washed many times, vacuum drying at the temperature ranging from 60 DEG C to 80 DEG C is conducted for 12-24 h, and then the copper-indium / carbon bimetal nano material is obtained. The operation technology is simple and practicable, the reaction time is short, and industrialization implementation is easy. When a prepared copper-indium / carbon bimetal nano material electrode is used for electrochemical reduction of CO2 in the solution, the excellent electrochemical activity and stability are shown, and especially, the electrochemical reduction CO2 activity of a Cu<1.0>In<1.5> / C samples is the best. According to the prepared bimetal nano material electrode, raw materials are cheap and easy to obtain, toxicity is avoided, and the environment friendliness requirement is met.

The invention belongs to the technical field of preparation of inorganic nano-composite materials, relates to a method for preparing nano indium oxide cubes and particularly relates to a method for preparing indium oxide cubes through a microwave-assisted hydrothermal method. The method comprises the following steps: preparing a mixed solution of indium nitrate and urea, reacting in microwave, generating an indium hydroxide predecessor through centrifugal washing, and finally obtaining the final product through high-temperature roasting; carrying out preparation of the mixed solution of indium nitrate and urea as follows: weighing indium nitrate and urea which are 1:1 to 10 in molar ratio, adding deionized water for dissolving, and magnetically stirring for 30 min to obtain a uniform, colorless and transparent solution. Indium oxide which is relatively uniform in appearance is prepared through a microwave-assisted reaction, the product adopts a cubic nano-structure, time can be shortened to dozens of minutes through a microwave reaction, and better pure phase and crystal form can be achieved within a relatively short time. The method is simple in technology and good in repeatability; the used raw materials are inorganic compounds and low in cost, easy to obtain and relatively low in cost; the method conforms to the environment-friendly requirements and brings convenience for industrialized production.

The invention provides a Ru monatomic and g-C3N4 composite photocatalyst and a preparation method and application thereof, and belongs to the technical field of nano material synthesis. According to the device, Ru monatomic is loaded on the surface of g-C3N4 by utilizing a simple and rapid one-step calcination method, so that the Ru monatomic and g-C3N4 composite photocatalyst is formed; the photocatalyst can efficiently and stably produce hydrogen through water photolysis under visible light.