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 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 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 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 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.