313results about How to "Good catalytic degradation effect" patented technology

The invention relates to a method for preparing a magnetic nanometer ferroferric oxide-graphene composite catalyst, which includes steps of: 1) dispersing graphite oxide in ethanol and water system; 2) respectively mixing soluble trivalent ferric salt and divalent ferric salt in ethanol; 3) mixing and stirring systems obtained in step 1) and step 2); 4) heating reaction system of 3) at temperature of 50 DEG C to 90 DEG C, and adjusting pH to be 9-11 for reaction by adding ammonia water; and 5) performing magnetic separation on products of step 4), washing through deionized water, and obtaining magnetic nanometer ferroferric oxide-graphene composite catalyst. The method provides a simple and practical coprecipitation method for preparing the nanometer ferroferric oxide-graphene composite catalyst which is uniform in particular sizes, even in dispersing and good in magnetism. The nanometer ferroferric oxide-graphene composite catalyst prepared by the method has excellent catalytic activity and is easy in preparing process and environment-friendly.

The invention relates to a preparation method of Bi3NbO7, and the application of the Bi3NbO7. The preparation method comprises the following steps: Nb2O5 is taken as raw material to prepare a hydrosoluble niobium oxalate aqueous solution by a hydrothermal method; bismuth nitrate (Bi(NO3)3 question mark 5H2O) is added into a citric acid solution and then added with a mixed solution of EDTA and stronger ammonia water so as to form an aqueous solution of bismuth; then, the niobium oxalate aqueous solution is added into the aqueous solution of bismuth according to the composition of a mixture ratio, and the obtained solution is heated and stirred under 60 DEG C to 80 DEG C so as to obtain a precursor solution of Bi3NbO7 photocatalyst which is then treated with polyesterification and is burned to decarburize and then roasted under 450 DEG C to 750 DEG C to obtain the nanometer Bi3NbO7 photocatalyst. The activity of the nanometer Bi3NbO7 photocatalyst prepared by the invention is far higher than that prepared by the traditional solid phase method and the preparation method is characterized by low synthesis temperature and simple and convenient operation.

The invention relates to the improvement on the ceramic beehive catalyst carrier, especially providing a ceramic beehive catalyst carrier with high mechanical strength and lower expansion parameter and preparing method. The invention is characterized in that: said beehive catalyst carrier is the alumina micro powder in 12-15%WT whose average particle diameter is less than 2 micron; the sheet kaolin and / or clay micro powder in 43-47% whose average particle diameter is less than 2 micron, the sheet steatite micro powder in 33-37% whose average particle diameter is 5-15 micron, and the fuse quartz in 6-12% whose average particle diameter is less than 2 micron to be mixed, molded and baked to attain the cordierite whose total amount is 92-96%, wherein, the Al203, MgO and SiO2 are each in 36-37%, 13.0-14.0% and 50-52%. The invention adds surface active agent in the mixture when in preparation. The prepared beehive cordierite total amount with 600 hole / square inch can reach 92-96%, the expansion parameter can reach 0.8X10-6 / Deg. C (800Deg. C to room temperature), and the factor of porosity can reach 39-40%. The invention can reduce the ignition temperature 25-40Deg. C, and reduce the tail gas discharge of nitrogen oxygen compound and carbon monoxide of vehicle 5-10% to meet the demand of Europe III standard.

The invention discloses a method for degrading methyl orange by use of perovskite / polysaccharide composite photocatalyst. The method comprises the following steps: preparing perovskite by utilizing nitrate of La, Cu and Fe, adding the perovskite and chitosan into an acetic acid solution, and performing ultrasonic treatment; drying to form a film to obtain a perovskite / chitosan composite photocatalyst; or adding xylan into distilled water, adding sodium hypophosphite and citric acid solution, adding perovskite, performing ultrasonic treatment, dehydrating, crosslinking to form a film, and washing with ethanol to obtain a perovskite / xylan composite photocatalyst; adding the composite photocatalytic material into the methyl orange solution, respectively reacting for 470-490 minutes at normal temperature in ultraviolet radiation. The polysaccharide used in the method is formed by compounding the catalyst and polysaccharide respectively with chitosan and xylan, the methyl orange photocatlytic degrading capability of the polysaccharide can be improved. The polysaccharide has the advantages of high catalytic efficiency, strong photo-response performance, regeneration, recycling and the like.

The invention discloses a composite nano Ag3PO4 / TiO2 material with photocatalytic performance prepared by a two-step process, and a method and application thereof. The preparation method comprises the following steps: carrying out reaction on raw materials P25 and NaOH in a reaction kettle at 160 DEG C for 16 hours, filtering, drying, and calcining in a muffle furnace at 450 DEG C for 6 hours to prepare rod-like nano titanium dioxide; and carrying out hydrothermal reaction on AgNO3, Na2HPO4.12H2O and polyethyleneglycol in a reaction kettle at 100-140 DEG C for 2-4 hours, thereby obtaining the composite nano Ag3PO4 / TiO2 material with photocatalytic performance. The invention aims to solve the problems of low sunlight utilization ratio, difficulty in reaction under visible light and the like in the nano TiO2 powder. After the photocatalytic performance is tested by methylene blue degradation, the calculation on the degradation rate of methylene blue indicates that the methylene blue degradation rate of the composite nano Ag3PO4 / TiO2 material prepared by the two-step hydrothermal process under visible light is up to 90% or above.

Disclosed is a preparation method of formaldehyde-photodegrading honeycomb activated carbon. The method is characterized by including: putting powdered activated carbon in a home-made cellophane mould, adding a black material prior to mixing for a certain period of time, rapidly adding a white material, performing high-speed mixing prior to free foaming, carrying out room-temperature curing prior to forming, putting the formed material in a muffle furnace for high-temperature heat treatment prior to obtaining the honeycomb activated carbon, subjecting TiO2 nano particles of P-25 type to ultrasonic dispersion to form suspension liquid, completely immersing the prepared honeycomb activated carbon into the suspension liquid, and performing heat treatment to prepare a P-25 / activated carbon composite having good photocatalytic degradation performance on indoor formaldehyde. The operation process has the main advantages that that the operation method is simple, the prepared honeycomb activated carbon is large in specific surface area and high in adsorptive property, can be prepared into arbitrary shape, has good catalytic degradation performance on indoor formaldehyde gas and is reusable, low in production cost and applicable to removal of formaldehyde gas after home decoration, and after the honeycomb activated carbon is loaded with P-25, the P-25 nano particles are evenly dispersed in the surface and pores of the honeycomb activated carbon.

The invention discloses a water ozonization treatment method by taking a cerium oxide nanomaterial as a catalyst. According to the method, different cerium oxide nanomaterials are prepared by adjusting and controlling the synthesis reaction conditions, and are taken as catalysts for adding into a water ozonization treatment system of phenol containing waste water, so that the degradation of phenol organic pollutants is facilitated. On the basis, a novel water ozonization treatment method is provided. The method belongs to the technical fields of water treatment and environmental catalysis. The prepared cerium oxide nanomaterial has the characteristics of small size, high dispersity in a water solution system, easiness for separation and recovery and the like, and has a wide application prospect in the application of water ozonization treatment.

Provided are a The molecular formulas are as follows: [Cu(3-bpah)(5-MIP)].2H20; [Ni(3-bpah)(5-MIP)].H20; [Co(3-bpah)(5-MIP)].H20; [Cu(4-bpah)(5-MIP)(H20)]; [Ni(4-bpah)(5-MIP)(H20)].H2O; [Co(4-bpah)(5-MIP)]. Transition metal chlorides, semi-rigid bispyridine bisamide ligands and 5-methyl isophthalic acid are added into deionized water, after pH adjustment, the above mixture is reacted under hydrothermal conditions, and products are obtained. The transition metal compounds are advantageous in that the transition metal compounds have a simple synthetic method, have strong affinity to organic pollutants of methylene blue, methyl orange and rhodamine B, and have good catalytic degradation effects.

The invention relates to the technical field of new materials, and in particular relates to a metal organic skeleton derivative material-three-dimensional network carbon-based composite photocatalyst,a preparation method thereof and use thereof. The preparation method comprises: preparing a sponge material coated with a bonding agent: immersing the sponge in a bonding agent solution to coat the sponge with the bonding agent, wherein the bonding agent is selected from the group consisting of graphene oxide, polyurethane, polyacrylic acid, polyetherimide, polyethylene glycol, polyvinylpyrrolidone or sodium alginate; preparing a sponge material loaded with a metal organic skeleton: drying the sponge material coated with the bonding agent, immersing the sponge material coated with the bondingagent in a metal organic skeleton solution to allow the metal organic skeleton to be loaded to the bonding agent; and pyrolyzing the sponge material loaded with the metal organic skeleton to obtain the metal organic skeleton derivative material-three-dimensional network carbon-based composite photocatalyst. The metal organic skeleton derivative material-three-dimensional network carbon-based composite photocatalyst can effectively decompose organic pollutants and photohydrolysis water to produce hydrogen, and has the characteristics of controllable volume, convenient recycling and no secondary pollution.

The invention relates to a preparation method of a rare earth Pr (praseodymium)-Dy (dysprosium) Pr-Dy doped nanometer titanium-based tin dioxide-antimony (Ti / Sb-SnO2) double coating electrode, belonging to the technical field of electrochemical water treatment. The sol-gel technology is adopted to coat the Pr-Dy doped Sn-Sb sol on the surface of a pretreated electrode substrate; and the heat treatment technology combining soaking-bottom low temperature sintering and temperature programming is adopted to prepare the nanometer Ti / Sb-SnO2 double coating electrode with a Pr doped Sn-Sb intermediate layer and a Dy doped Sn-Sb catalyst layer. The electrode is characterized by high oxygen evolution potential, high catalytic performance, high conductivity, durability and the like.

The invention relates to a preparation method of a CQDs / TiO2 visible light photocatalyst. The invention overcomes the defect that titanium dioxide is catalytically degraded under sunlight, and CQDs / TiO2 prepared by introducing CQDs can rapidly and efficiently degrade organic pollutants under the sunlight, so that the disadvantage that TiO2 only can be catalytically degraded under ultraviolet lightis solved. The preparation method comprises the following steps: firstly carrying out ultrasonic processing on phosphoric acid activation corn stalk activated carbon with sodium hydroxide solution, then transferring into a hydrothermal reaction kettle, carrying out hydrothermal synthesis under certain conditions, neutralizing, and carrying out dialysis, so that a carbon quantum dot solution is obtained; taking right amount of titanium dioxide (particle size is 40nm) and dispersing into absolute ethyl alcohol, adding the carbon quantum dot solution, stirring and compounding, centrifuging, washing, and drying, so that the CQDs / TiO2 sunlight photocatalyst is obtained. The obtained QDs / TiO2 has the characteristic of efficient photocatalytic degradation under the sunlight, degradation rate is99.5% when photocatalytic degradation is carried out on Rhodamine B for 105 minutes in the sun, and the degradation rate is 99.9% when catalytic degradation is carried out for 120 minutes, so that theRhodamine B is basically completely degraded.

The invention discloses a photo-degradable formaldehyde membrane based on modified titanium dioxide, belonging to the technical field of membranes. According to the photo-degradable formaldehyde membrane, when a hardening liquid coating layer is configured, modified titanium dioxide is prepared and is well dispersed into hard coating layers of products of automobile membranes, building membranes and household membranes, so that the process is simplified, the cost is saved, and furthermore, the obtained photo-degradable formaldehyde membrane is capable of degrading formaldehyde without influencing the original properties of the automobile membranes, the building membranes and the household membranes.

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 relates to a preparation method of a core-shell type cuprous oxide photocatalyst and belongs to the technical field of preparation of photocatalysts. The preparation method comprises the following step of: boiling with alkalie to remove silicon; fermenting and modifying by utilizing organic carboxylic acid and active sludge; increasing the quantity of carboxyl groups on the surface of zeolite under the action of active sludge microorganisms; taking the modified zeolite as an inner core of the catalyst and adding the modified zeolite into a copper ion solution; forming a copper hydroxide precursor under an alkaline condition and reducing copper hydroxide by glucose to form a cuprous oxide crystal nucleus; generating electrostatic and chemical adsorption through the carboxyl groups and the cuprous oxide crystal nucleus on the surface of the zeolite; and gradually depositing cuprous oxide on the surface of the zeolite, so as to form urchin-like core-shell type cuprous oxide. According to the core-shell type cuprous oxide prepared by the invention, electronic structures of the inner core and a shell are hybridized, and the problem that pure cuprous oxide is agglomerated is solved; the sizes the core and the shell are larger than the size of a cuprous oxide crystal grain; when the core-shell type cuprous oxide photocatalyst is used, an operation process is relatively easy to control; the core-shell type cuprous oxide photocatalyst is easy to recycle and reutilize and has wide application prospect.

A copper complex based on dipyridine piperazine organic ligand and Anderson type polyacid, and a synthesis method and application thereof. The molecular formula of the complex is one selected from the followings: H[Cu2L1Cr(OH 6Mo6O18 (mu2-OH)2].4H2O, and [Cu2L2Cr(OH)6MoVI5MoVO18 (H2O)4].4H2O. The method is as below: adding copper salt, Anderson type polyacid, and dipyridine piperazine organic ligand into deionized water, stirring at room temperature, adjusting the pH value, insulating under hydrothermal conditions in a high-pressure reaction kettle, cooling to room temperature to produce massive dark green crystals, cleaning and drying, so as to prepare the copper complex based on dipyridine piperazine organic ligand and Anderson type polyacid. The synthetic method of the complex is simple, easy for crystallization and high in synthesis yield, the complex has strong affinity and good photocatalytic degradation effect on water-soluble pollutants, and can be used as photocatalytic materials.

The invention provides a method for preparing a composite material of activated carbon loaded with nanometer zero-valent iron, comprising the following steps: Step 1: adding microcrystalline cellulose solution and citric acid to the activated carbon, and hydrothermally reacting to prepare modified activated carbon; Step 2 : Polyethylene glycol is dissolved in ultrapure water to prepare a dispersant solution; Step 3: FeSO4·7H2O is dissolved in the dispersant solution, stirred magnetically under nitrogen protection, and slowly dripped into NaBH4 solution to obtain Activated carbon multi-site loaded nano zero-valent iron composite material. The invention prepares multi-point activated carbon, increases the active sites of activated carbon to a large extent, and effectively improves the loading capacity of nano-zero-valent iron; uses polyethylene glycol solution as a dispersant, so that nano-zero-valent iron particles are evenly loaded on the activated carbon , good dispersion, and improve the catalytic degradation ability of the composite material to pollutants; polyethylene glycol is non-toxic and has good stability, and the residual components will not cause secondary pollution during the repair process.

The invention discloses a microbial strain which can effectively degrade phenol and relates to alcaligenes faecalis JH1013 CCTCC NO: M 208006 and a method for degrading phenol wastewater by using a fixed alcaligenes faecalis that is produced by alcaligenes faecalis. The method has the following advantages that: 1. the alcaligenes faecalis is easy to culture, the fixing technique is simple, the catalytic degradation effect is good, the high-concentration phenol can be resistance, the phenol degradation capacity is strong, which can high efficiently degrade the phenol wastewater with the concentration of as high as 2000mg. L<-1> and be used repeatedly; 2. hydrotalcite, hydrotalcite-like compounds, nano calcium carbonate, Gamma-Al2O3 or the loading solid base are used as carriers for preparing the fixed alcaligenes faecalis, the elasticity is good, the temperature and pH value resistances are strong, the mechanical strength is high, the degradation performance is stable and the half-time is long; 3. the carriers of the hydrotalcite, the hydrotalcite-like compounds, the nano calcium carbonate and the Gamma-Al2O3 of the fixed cell can be used repeatedly by calcinations; 4. the fixed alcaligenes faecalis is used for degrading the phenol, the degradation process is simple, the conditions are moderate, the environment is friendly, the bacterial cells are difficult to loss, the concentration of the microorganisms in the carriers is high, the degradation speed is fast, the degradation efficiency is high and the secondary pollution is not easy to be caused.

The invention relates to a method for preparing a solid ferric oxide-loading activated carbon Fenton's reagent. The method includes fully mixing activated carbon pretreated with acid and an iron salt,and then performing high-temperature calcination. The obtained product is a solid particle substance that is ferric oxide-loading activated carbon. The method overcomes problems that traditional Fenton's reagents cannot be recovered, that iron mud formation from added iron ions requires secondary treatment, and that catalytic degradation activity is highly dependent on acidic environment conditions, and the like. The method is simple in process and low in cost, and the prepared product has advantages including stable chemical properties, no harm to environment, low iron ion dissolution rates,capability of activating hydrogen peroxide and persulfate to achieve catalytic degradation of organic matters, and high efficiency and high speed during application under neutral conditions.

The invention relates to a compound material which takes the micro compound molecular sieve as the carrier and carries the semiconductor element, the preparing method and the application as a light catalyst. In order to overcome the limitations of the micro molecular sieve and the mesoporous molecular sieve, the invention relates to a Ti / 13X / MCM-41 compound material which takes the micro and mesoporous compound molecular sieve as the carrier combined with the absorbing effect of the molecular sieve and the light catalyst effect of the semiconductor together. The invention adopts the water heating method to compound the Ti / 13X / MCM-41. The compound material is the light catalyst for purifying the sewage. The compound material Ti / 13X / MCM-41 of zero point one g / L is used for removing the organic contamination bisphenol A which is hard to be deteriorated; the invention can make the one thousand ppb bisphenol A reduce to one ppb under the common light shine for five hours, and if under the sun shine the invention reduces to one ppb after one hour.

The invention discloses a method for treating phenol-containing waste water by sawdust immobilized alcaligenes faecalis. The method has the advantages that (1) the immobilized alcaligenes faecalis is easy to culture and has the advantages of simple immobilization process, excellent catalytic degradation effect, resistance to high-concentration phenol-containing waste water with the concentration of phenol up to 3000mg.milligram<-1>, strong phenol decomposition capability and repeated use; (2) the carrier of the immobilized alcaligenes faecalis is sawdust, and modified utilization of the sawdust is realized by a chemical method, so the method improves the treatment efficiency for the phenol-containing waste water by means of microbial degradation, and has a broad development prospect; (3) the immobilized alcaligenes faecalis prepared through taking sawdust as the carrier has excellent elasticity, strong resistance to temperature and pH value, stable degradation property and long half life period; and (4) when used for treating the phenol-containing waste water, the sawdust immobilized alcaligenes faecalis has the advantages of simple process, low running cost, moderate conditions, environmental protection, uneasy loss of thalli, high concentration of microorganism inside the carrier, quick degradation speed, high degradation efficiency and no secondary pollution, and can realize continuous industrial degradation of the phenol-containing waste water at the same time.

The invention relates to a process for preparing porous catalytic filling for internal electrolysis which consists of, adding by proportion multiple component noble metal including palladium, chromium into the conventional electrolyzation filler, press forming in die arrangement, elevating the temperature, obtaining porous inner electrolyzation filler with specific shapes through combustion, wherein porous catalytic material comprises the components (by weight percentage) of iron powder 30-40%, carbon powder 30-40%, super macromolecular polyethylene 10-15%, palladium 1-2.5%, chromium 1-2.5%.

A synthetic method of a polypyrrole-functionalized cobalt complex composite material and applications of the material are disclosed. A hydrothermal synthetic process is adopted. The composite material is prepared by adding CoCl<2>.6H2O, N,N'-bis(3-pyridyl)-thiophene-2,5-dicarboxamide and trimesic acid into deionized water, performing a hydrothermal reaction to synthesize a cobalt complex the chemical formula of which is [Co(L)(1,3,5-HBTC)], grinding the cobalt complex to obtain a microcrystalline cobalt complex, mixing with pyrrole and water under ultrasonic waves, adding an aqueous amine sulfate solution, stirring, and allowing the mixture to stand to obtain the composite material. The synthetic method and the applications are advantageous in that the method adopts the polypyrrole to functionalize the cobalt complex, the photoresponse range of the complex is expanded simply and rapidly, recombination of photogenerated electrons and holes in a photocatalysis process is effectively reduced, and the composite material has good effects of catalyzing degradation of dye pollutants under visible light, saves energy consumption and reduces environment pollution caused by the dye pollutants.

The invention discloses a teflon superfine fiber supported titanium dioxide photocatalytic membrane and a preparation method thereof. The preparation method is characterized by including: using an electrostatic spinning method to prepare PTFE superfine fibers, impregnating the PTFE superfine fibers into a titanium precursor solution, and performing high-temperature sintering to prepare the fiber catalytic membrane containing titanium dioxide. By the preparation method, the PTFE superfine fiber supported titanium dioxide photocatalytic membrane with high photocatalytic efficiency and high recovery utilization rate can be prepared.

The invention discloses an iron modified photocatalytic material, a preparation method and application thereof. The preparation method comprises the steps of adding a potassium bromide solution to a solution containing an iron salt and bismuth nitrate for high-temperature reaction to obtain the iron modified photocatalytic material. The photocatalyst with heterojunction can be successfully prepared by the preparation process, and the photocatalytic effect can be greatly improved; by the introduction of the iron salt, the specific surface area of the photocatalytic material can be increased, and the adsorption performance can be enhanced; in the presence of hydrogen peroxide, the photocatalytic reaction process causes an iron element on the surface of the catalytic material to form a chainreaction between ferrous iron and ferric iron, and the catalytic degradation effect is very excellent; the operation method is simple and easy, raw materials are easy to obtain, the cost is low, and the prospect of promotion and implementation in the practical application is good.

The invention discloses a preparation method of Keggin type saturated phosphomolybdate. The preparation method comprises the following steps: weighing sodium molybdate and phosphoric acid, dissolvingin deionized water and performing constant-temperature stirring after temperature rise; then adding hydrochloric acid for acidification; subsequently adding cobalt chloride and phenanthroline for continuous constant-temperature stirring, regulating a pH value to a neutral state, packaging mixed liquid in a reaction kettle and reacting for 4-5 hours at a high temperature; cooling, centrifuging anddrying; the difference between a preparation method of a coating material of the Keggin type saturated phosphomolybdate and the preparation method of the Keggin type saturated phosphomolybdate lies inthat the coating material is dissolved in a silver nano-particle solution instead of deionized water; through test, the photo-catalytic material has very good catalytic degradation effect on wastewater, in particular to methylene blue dye wastewater.

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 discloses a method for synthetizing nano zinc oxide particles by utilizing high-temperature self-propagating reaction. The method includes: mixing chemically pure Al, CuO, ZnO and ZrO2 powder with grain size of 200 meshes according to a certain proportion, filling the powder in a graphite crucible and laying a layer of pyrophoric powder on the surface of the powder, generating self-propagation high-temperature reaction by igniting the pyrophoric powder, obtaining product in a stainless steel collector disposed at a position 30-40cm above the crucible, placing the collected product into a tubular furnace for annealing at the temperature of 150 DEG C-250 DEG C for 10-30min and carrying out slow furnace cooling to obtain a final product. The synthetic method for zinc oxide nano-particles is simple in process, low in equipment requirement, high in yield, high in purity and full of industrial production value.

The invention discloses a magnetic nitrogen-doped reduced graphene oxide compound catalyst as well as a preparation method and application thereof. The magnetic nitrogen-doped reduced graphene oxide compound catalyst is prepared by taking urea as a nitrogen source and a reducing agent, mixing the urea with magnetic graphene oxide and carrying out hydrothermal reaction. The compound catalyst disclosed by the invention has the advantages of no toxin, low cost, simple preparation process, easiness in separation, convenience for regeneration, good catalytic effect and the like; the preparation method of the compound catalyst has the advantages of simplicity in operation, low requirements on instrument equipment and experiment conditions, less energy resource consumption, convenience for large-scale preparation and the like. The compound catalyst provided by the invention can be used for treating organic pollutants, which are difficult to degrade, in wastewater; high-activity sulfate radical groups are generated through catalyzing persulfate, so that the organic pollutants which are difficult to degrade, especially dyestuff pollutants, in the water are efficiently removed; the compound catalyst has the advantages of high catalytic degradation effect, wide application range, simplicity and convenience for operation, no secondary pollution and the like.

The invention discloses a titanium dioxide nano material rich in oxygen vacancy defects as well as a preparation method and application thereof, and belongs to the technical field of semiconductor photocatalysts. According to the preparation method, a sol-gel and solid-phase synthesis combined method is adopted, and soluble titanium salt is dissolved and then added into an alkaline solution to obtain a precipitate; the precipitate reacts with a reducing agent to obtain titanium dioxide precursor gel with electronegative groups; and the titanium dioxide precursor gel with electronegative groupsis sintered in inert gas to obtain the pure titanium dioxide nano material rich in oxygen vacancy defects. The oxygen vacancy content of the titanium dioxide nano material rich in oxygen vacancy defects is 8%, the energy band gap is 1.94 eV, and compared with other titanium dioxide, the titanium dioxide nano material has higher photocatalytic activity. The method has the advantages of being green, simple, convenient, high in purity, high in safety, energy-saving, environment-friendly and capable of achieving large-scale mass production, and the material can be applied to the fields of organicdye degradation, gas purification and the like.

The invention discloses a carbon-based-multimetal composite nanometer catalytic material. The porous carbon-based-multimetal composite nanometer catalytic material is prepared by adsorbing multimetalions by microorganisms serving as adsorbents and then performing carbonization and activation, wherein the multimetal ions are loaded on the surface and in the micropores of a carbon-based-multimetalcomposite nanometer catalytic material in the forms of nanoparticles of multimetal elementary substances and / or multimetal oxides. The carbon-based-multimetal composite nanometer catalytic material has large specific surface area, rich micropores and metal particle distribution uniformity, has synergistic effect, interfacial effect and strain effect, is applicable as a catalyst, and has wide market application prospect. The invention also discloses a preparation method and application of the carbon-based-multimetal composite nanometer catalytic material. The method is simple in process, low incost and environmentally-friendly. The carbon-based-multimetal composite nanometer catalytic material has good catalytic degradation effect on organisms in high-concentration organic waste water, andhigh stability and high treatment efficiency are achieved.