57results about How to "Facilitate catalytic degradation" patented technology

The present invention discloses a photochemical preparation method of a single atom Au for catalytic degradation of VOCs, and the method includes following steps: step 1, preparation of TiO2 nano-sheets in thickness of atomic scale: (a) adding TiCl3 and ethylene glycol to a reactor, and performing mechanic stirring; (b) filtering a liquid obtained after the above reaction by centrifugation, and then drying separated sediments to remove water; (c) grinding the dried solid, and conducting screening to obtain nano-powder of TiO2; and step 2, loading the single atom Au by a photochemical method. The single atom Au catalyst prepared by the method has high treatment efficiency in processes of plasma catalytic degradation of VOCs (the toluene removal rate is 98.4% and the dichloromethane removal rate is 98.2%). The single atom Au catalyst has long service life (after being used for 200 hours, the removal rate of the single atom Au catalyst on toluene and dichloromethane can reach 94.9% and 97.4%, respectively).

The invention discloses a preparation method of ordered mesoporous titania/silver photocatalyst, relating to a preparation method of titania/silver and aiming to solve the technical problems of small specific surface area, poor orderliness and low photocatalytic activity of mesoporous titania/silver photocatalyst prepared by prior arts. The preparation method comprises the steps of silver solution preparation, titanium precursor preparation, titania/silver gel preparation, and heat treatment. The inventive photocatalyst has specific surface area of 120-160 m<2>/g, has the advantages of uniform mesopores and high catalytic activity; can be applied to photocatalysis field, and water treatment field of lake, ocean, municipal sewage and industrial sewage.

The invention belongs to the technical field of photocatalysis and sewage processing, and provides a preparation method and application for an efficient and stable foam nickel base photocatalytic material. Foam nickel is taken as a substrate, a crystal layer method is adopted to load a zinc oxide crystal layer, then, a hydrothermal method is utilized to enable a zinc oxide nano array along the zinc oxide crystal layer, and silver nanoparticles are deposited on the surface of the zinc oxide nano array by in situ photo-reduction to obtain silver/ zinc oxide nanorod array/ foam nickel self-supporting materials. The related preparation method is simple. The zinc oxide nanorod array is directly loaded to the surface of the foam nickel, and the surface stability of the material is improved; according to a silver/ zinc oxide nanorod array/ foam nickel ternary complex structure, the adsorption and the utilization of light are enhanced, meanwhile, electrons and holes are accelerated to separate, and photocatalysis activity is improved; the self-supporting structure can be used for overcoming the defects of separation recovery, binding agent coating, big possibility of agglomeration and thelike of powdery catalyst. The porous structure filtering performance of the photocatalytic material is used for cooperating with photocatalytic degradation to further improve the degradation of dye and antibiotic waste water.

The invention discloses an in-situ iron-based Fenton-like catalyst and a synthesis method and application thereof. The synthesis method comprises the following steps of adding a precursor melamine solution into an iron source solution, and evaporating a mixed solution to dryness to obtain a solid; drying and uniformly grinding the solid, then calcining the solid for 2-5 hours under the condition of 450-650 DEG C, and afterwards, conducting cooling to obtain the catalyst. Iron substances in the catalyst exist in the form of ferric oxides, and are loaded on a carbon nitride framework through Fe-N bonds, the generation of surface defects of the ferric oxides is triggered due to the introduction of carbon nitride, and the electron transfer speed of the catalytic reaction process is increased.In the meanwhile, Fe-g-C3N4 has a certain self-degradation capability on pollutants, a harsh pH condition is not needed anymore in a Fenton-like reaction process, instead, excellent catalytic degradation performance, adaptability and stability can be shown on multiple pollutants simply under neutral conditions, and the catalyst has a great application potential in the aspect of sewage treatment.

The invention discloses preparation, a catalytic property and use in dye decolorizing of spore laccase from Bacillus licheniformis LS04 (CGMCC No.4263). The invention also relates to a nucleotide sequence coding the spore laccase. The invention also relates to a nucleotide sequence for coding the spore laccase. In the invention, Bacillus licheniformis LS04 ferments at 37 DEG C for 5 days on a solid sporulation culture medium, spores are washed off by deionized water, and pore suspension with laccase activity can be obtained by series measures such as lysozyme treatment. The spore laccase has high catalytic activity under alkaline and high-temperature conditions, can maintain high enzyme activity in high-concentration organic solvent and salt solution, has good decolorizing effect on synthesized dyes of different structures under action of an amboceptor and can be used for treating industrial dye waste water.

The invention takes Mn stress-free fleur-de-lis as a blank group and utilizes a MnSO4 solution to respectively stress experimental groups of fleur-de-lis for 1 month and 2 months. In situ manganese-enriched biochars are acquired through pyrolysis under N2 atmosphere after harvesting treatment; the biochars are respectively named as BC-L0, BC-L1, BC-L2, BC-R0, BC-R1 and BC-R2 on the basis of collection parts; Rhodamine B is taken as a probe molecule for researching influences of conditions of pyrolysis temperature (500 DEG C, 700 DEG C and 900 DEG C) and pyrolysis time (0.5 h, 1 h and 2 h) andthe like on adsorption capacity of biochars, and screening the preparation conditions when the adsorption capacity of biochars is optimal; SEM, EDS, XRD, AAS and the like are adopted for physically representing biochars, and meanwhile establishing a Fenton-like system and researching the catalytic capacity of the manganese-enriched biochars; a biochar particle modified glassy carbon disc electrodeis utilized to research electrocatalytic reduction reaction of H2O2 in neutral medium on different biochar catalysts through a cyclic voltammetry scanning method, so as to represent electro-catalyticperformances of different biochars.

The invention relates to a method for in-situ synthesis of a BiOI composite catalyst and a product. The BiOI composite catalyst is BiOI@(001)TiO2@Ti3C2, and the method comprises the following steps: (1) dispersing Ti3AlC2-MAX phase ceramic powder into an HF solution for etching to obtain Mxene-Ti3C2; 2) dispersing Mxene-Ti3C2 in a hydrochloric acid solution containing NaBF4, and carrying out magnetic stirring to obtain a mixed solution; 3) pouring the mixed solution into a high-temperature and high-pressure reaction kettle, reacting in a muffle furnace, and centrifugally washing with deionizedwater and absolute ethyl alcohol to obtain (001)TiO2@Ti3C2; 4) dispersing and dissolving a certain amount of (001)TiO2@Ti3C2 and Bi(NO<3>)<3>*5H<2>O in an ethylene glycol solution, magnetically stirring for a period of time, and dropwise adding an ethylene glycol solution containing KI to obtain a mixed solution; and 5) pouring the obtained mixed solution into a high-temperature high-pressure reaction kettle, reacting in a muffle furnace, centrifugally washing with deionized water and absolute ethyl alcohol, and drying to obtain BiOI@(001)TiO2@Ti3C2. According to the method, heterojunction isformed by utilizing (001)TiO2@Ti3C2 and BiOI, so that electron holes generated by BiOI are separated more efficiently, and catalytic degradation on pollutants is facilitated.

The invention discloses a method for degrading antibiotics. The method comprises the following steps: adding a magnetic MIL-101(Fe)/TiO2 material into a water body containing antibiotics to degrade the antibiotics under normal temperature and light source irradiation; and then magnetically recovering the magnetic MIL-101(Fe)/TiO2 material for recycling. The magnetic MIL-101(Fe)/TiO2 composite material is easy to be magnetically separated and recovered, still maintanis excellent degradation performance after repeated reuse, and is a green environment-friendly material; and the composite material is simple to prepare, convenient to operate, reduced in energy consumption and short in catalytic time, shows extremely high degradation effect on antibiotics under sunlight, and has good application prospects in degradation nof antibiotics.

The invention relates to a method and product of in-situ synthetic TiO2@Ti3C2 by using isopropylamine intercalated and layered Ti3C2. The synthetic method comprises the following steps: 1) enabling Ti3AlC2-MAX-phase ceramic powder to be dispersed in HF solution for etching, to obtain Mxene-Ti3C2; 2) enabling the Mxene-Ti3C2 to be dispersed in mixed liquid of isopropylamine and water for performingisopropylamine intercalation, to obtain isopropylamine intercalated Ti3C2; 3) enabling the isopropylamine intercalated Ti3C2 to be dispersed in the water, performing ultrasonic treatment in an argonatmosphere, after drying, to obtain isopropylamine intercalated and layered Ti3C2; and 4) performing in-situ oxidation on the isopropylamine intercalated and layered Ti3C2 in an oxygen condition, to obtain TiO2@Ti3C2. The method is capable of improving an interlayer spacing distance of the Mxene-Ti3C2 by using the isopropylamine and the ultrasonic treatment, providing more attachment sites for thegenerated TiO2, and more advantageously performing catalytic degradation on a pollutant.

The invention relates to a device and a method for removing organic pollutants in water by electro-catalytic ozone adsorption membrane filtration. The device comprises an oxygen source, an ozone generator and an ozone solution storage tank which are connected in sequence, wherein the ozone solution storage tank and a raw water storage tank are connected to an electro-catalytic ozone membrane filtration reactor through pipelines; the electro-catalytic ozone membrane filtration reactor is composed of a metal mesh electrode, a silica gel insulating washer and an electro-catalytic ozone filtrationmembrane electrode; the positive electrode of a stabilized voltage supply is connected to the metal mesh electrode through a connecting wire; and the electro-catalytic ozone filtration membrane electrode is connected to the negative electrode of the stabilized voltage supply through a connecting wire; the cathode and the anode are separated by the silica gel insulating washer. The device and themethod have the technical advantages of being low in operation pressure, small in impressed current, low in energy consumption, capable of efficiently and continuously removing organic pollutants difficult to degrade and high in ozone conversion free radical efficiency.

The invention belongs to the technical field of nano-catalysts, and particularly relates to a preparation method of a monatomic catalyst for activating sulfite to degrade pollutants. The method comprises the following steps: preliminarily mixing lignin and ferric nitrate according to a certain proportion, and placing in a mechanical ball mill for ball milling to obtain a pretreated mixture; putting the mixture into a high-temperature tube furnace, and calcining under the protection of high-purity nitrogen to obtain a carbonized sample; carrying out secondary ball milling on the carbonized sample, soaking and washing with a dilute HCl solution, and washing with deionized water until the sample is neutral; and primarily drying the washed sample at a low temperature, putting the dried sample into a high-temperature tube furnace, and carrying out secondary calcination under the protection of high-purity nitrogen to obtain a final catalyst sample. The method provided by the invention is simple and effective, can be used for large-scale synthesis of monatomic catalysts, and overcomes the defects of complex synthesis and difficulty in large-scale preparation in other technologies in the prior art.

The invention relates to a method for in situ synthesis of TiO2@Ti3C2 through the intercalation and layering of hydrazine hydrate and a product. The synthetic method comprises the following steps: (1)dispersing Ti3AlC2-MAX-phase ceramic powder into an HF solution, and etching, so as to obtain Mxene-Ti3C2; (2) dispersing Mxene-Ti3C2 into hydrazine hydrate, carrying out hydrazine hydrate intercalation, so as to obtain hydrazine hydrate intercalated Ti3C2; (3) dispersing hydrazine hydrate intercalated Ti3C2 into water, carrying out ultrasonic treatment in an argon atmosphere, and drying, so as to obtain hydrazine hydrate intercalated and layered Ti3C2; and (4) carrying out in situ oxidation on hydrazine hydrate intercalated and layered Ti3C2, so as to obtain TiO2@Ti3C2. According to the method, the interlayer spacing of Mxene-Ti3C2 is increased through hydrazine hydrate and ultrasonic treatment, so that more attachment sites are provided for generated TiO2, and the catalytic degradationof pollutants is promoted.

The invention discloses an iron-aluminum-carbon composite catalytic material, a preparation method and an organic wastewater degradation method, which are particularly suitable for the field of wastewater treatment. The preparation method comprises the following steps: respectively dissolving a ferric iron compound, a trivalent aluminum compound and glucose in ultrapure water to form three solutions; slowly adding the ferric iron compound solution and the trivalent aluminum compound solution into the glucose solution at the same time, perofrming stirring, adjusting the pH value, continuously performing stirring, transferring the mixture into a hydrothermal reaction kettle, carrying out hydrothermal reaction, and embedding iron and aluminum into a carbon material skeleton in the process offorming the carbon material in situ; and washing the hydrothermal reaction product, and performing drying to obtain a solid reactant, thereby obtaining the iron-aluminum-carbon composite catalytic material. The catalytic material is high in catalytic activity, good in stability, capable of being repeatedly used, capable of reducing wastewater treatment cost, environmentally friendly and good in economical efficiency; and the method has the advantages of few preparation steps, good operability, low cost, low equipment requirement and wide practicability.

The invention belongs to the field of preparation of nano zero-valent iron carbon materials, and particularly relates to a graphitized carbon loaded nano zero-valent iron material and a preparation method and application thereof. The preparation method of the graphitized carbon loaded nano zero-valent iron material comprises the following steps: (1) putting ferric salt and 2-aminoterephthalic acid into a reaction kettle of a ball mill; (2) adding a grinding medium into a reaction kettle of a ball mill, and grinding to obtain a ball-milled material; and (3) pyrolyzing the ball-milled material, and cooling to obtain the graphitized carbon loaded nano zero-valent iron material. The prepared graphitized carbon loaded nano zero-valent iron material has higher and more durable catalytic degradation efficiency, and can better remove pollutants in an environmental water sample, especially organic dye pollutants.

The invention belongs to the technical field of catalysts, and particularly relates to a preparation method of an iron pillared montmorillonite composite catalyst and application of the iron pillared montmorillonite composite catalyst. According to the invention, a ratio of montmorillonite to an iron pillaring agent is scientifically adjusted, and reasonable calcination (low-temperature calcination under the aerobic condition) is conducted, so the prepared iron pillared montmorillonite composite catalyst has the advantages that the montmorillonite keeps a relatively complete surface structure morphology, hematite with relatively good crystallization appears at the same time, and the conductivity of original materials is improved; and a certain amount of surface hydroxyl groups with certain strength are reserved and can can act with ferrous iron in a water phase to form a Fe (II) surface complex with high reduction activity, so the degradation of nitroaromatic pollutants is facilitated, and the pollution problem of nitrophenol wastewater is solved.

The invention discloses a persulfate activating agent, a preparation method and applications thereof. The preparation method comprises the following steps: preparing a graphite oxide dispersion liquid; dissolving a nickel salt and a tin salt into water, and uniformly mixing; adding the graphite oxide dispersion liquid, and stirring; and adjusting the pH value, cooling to room temperature after carrying out a heating reaction, and performing suction filtration, washing and drying to obtain a persulfate activator, wherein the graphite oxide accounts for 1-3 parts by mass, the nickel salt accounts for 8-11 parts by mass, and the tin salt accounts for 5-9 parts by mass. The persulfate activating agent prepared by the preparation method disclosed by the invention is a nickel stannate-graphene (Ni2SnO4-RGO) compound activated persulfate, the performance of catalytic degradation of bisphenol A (BPA) is greatly improved, it is found that the degradation rate can reach 100% within 30 min underthe condition that the pH value is equal to 8, the preparation process is simple, conditions are easy to control, the preparation process is environmentally friendly, and the cost is low.

The invention discloses a chitosan micromolecular degradation turbulent flow reaction tank. The chitosan micromolecular degradation turbulent flow tank comprises a tank body; a vertically arranged stirring shaft is rotationally mounted on the tank body; a stirring impeller is arranged on the stirring shaft; a plurality of radial turbulent flow plates are arranged on the inner wall of the tank bodyin the circumferential direction; a plurality of turbulent flow through holes are formed in the radial turbulent flow plates; rotational flows generates turbulent flows through the turbulent flow plates, so that catalytic degradation of the chitosan is promoted; the turbulent flow plate at the bottom of the tank enables the bottom of the tank to generate turbulent flows, so that the chitosan settled at the bottom of the tank is lifted and catalytic degradation of the chitosan is further improved; and a turbulent flow riser is additionally provided, so that rotational flows in the vertical direction are increased while rotational flows are generated in the horizontal direction, catalytic degradation of the chitosan is promoted and the degradation rate of the chitosan is increased.

The invention provides a gold nano-particle-bismuthous sulfide heterojunction nanometer photocatalysis material, a preparation method thereof and application of the gold nano-particle-bismuthous sulfide heterojunction nanometer photocatalysis material in degrading of pollutants. The preparation method comprises the following steps: (1) preparing a sulfur-containing solution, namely, degassing 1-octadecene at the atmosphere of argon, and uniformly mixing the 1-octadecene subjected to degassing and bis(trimethylsilyl) sulfide; (2) preparing a gold-containing solution, namely, mixing oleylamine and HAuCl4, degassing, and carrying out heating reaction under the condition of stirring until the mixture is wine red; (3) preparing a bismuth-containing solution, namely, mixing Bi(OAc)3, oleic acid and 1-octadecene, and dissolving Bi(OAc)3; (4) mixing the sulfur-containing solution and the gold-containing solution, adding a mixture in the bismuth-containing solution, heating, and annealing; and (5) adding excess acetone solution, and purifying to obtain a composite, linking to the middle part of a bismuthous sulfide one-dimensional nano-rod, of gold nano-particles. The gold nano-particle-bismuthous sulfide heterojunction nanometer photocatalysis material is good in photo catalytic degradation and photosensitivity, has the inactivation to bacteria and can be applied to the environment field of improving water quality.