167results about How to "Improve catalytic degradation efficiency" patented technology

The invention relates to a nano particle taking Fe3O4 as core, in particular to a TiO2 / SiO2 / Fe3O4 nano particle with nuclear structure and manufacturing method thereof. The invention solves the technical problems that nano TiO2 particle catalyst has low catalytic efficiency under natural light and is difficult to meet recovery control while remaining high catalyst activity in sewage treatment. The method includes steps of preparing SiO2 / Fe3O4 solution, preparing titanium sol and mixing the prepared SiO2 / Fe3O4 solution and the titanium sol. The invention adopts ferromagnetic particle as a carrier core and prepared TiO2 / SiO2 / Fe3O4 particle with nuclear shell structure as catalyst, and the catalyst particle has good dispersity and water-solubility and can be fully contacted with organic pollutant in sewage, thereby not only having high efficiency of suspended phase photocatalyst but also realizing magnetic control of catalyst by super paramagnetic nuclear energy, thus being effectively recovered.

The invention discloses a preparation method of a noble metal-loaded activated carbon fiber monoatomic catalyst for catalytic degradation of VOCs at room temperature. The method includes the steps of:(a) pretreatment of a carrier: immersing activated carbon fiber in a sulfuric acid solution, performing ultrasonic treatment, then subjecting the ultrasound treated solution to heating reaction in awater bath pot, then performing cleaning with distilled water to neutral, and conducting natural airing to obtain modified activated carbon fiber; (b) noble metal loading: impregnating the modified activated carbon fiber in a noble metal solution, and performing ultrasonic treatment and standing, then adding a sodium hydride solution to reduce noble metal, finally taking out the activated carbon fiber, and conducting washing and drying to obtain a noble metal-loaded activated carbon fiber semi-finished product; and (c) calcination: putting the noble metal-loaded activated carbon fiber semi-finished product in a muffle furnace for calcination, thus obtaining the noble metal-loaded activated carbon fiber monoatomic catalyst finally. The method provided by the invention greatly improves the catalytic degradation efficiency of the monoatomic catalyst.

The invention relates to a preparing method for an oriented-zinc-oxide-nanometer-bar-loaded fiber membrane. The preparing method includes the following steps that a high-molecular polymer and zinc acetate are dissolved in an organic solvent, magnetic nanometer particles are added into the mixture, the mixture is fixed to be even, and then an electrostatic spinning solution is obtained; an ordered high-molecular polymer / zinc acetate / magnetic nanometer particle fiber is prepared with a magnetic-field-assisting electrostatic spinning technology; zinc salt, hexamethylene tetramine and ammonium hydroxide are mixed to be even in water, and a growth solution is obtained; the high-molecular polymer / zinc acetate / magnetic nanometer particle fiber is subjected to low-temperature heat treatment, the zinc acetate is converted into zinc oxide, then the zinc oxide is put into the growth solution, and the oriented-zinc-oxide-nanometer-bar-loaded fiber membrane is obtained after a reaction with the hydrothermal method. According to the preparing method, the reaction condition is wild, operation is easy, and the controllability is high; the product prepared with the method is not limited by application in the inorganic substance aspect, the photoelectric performance is excellent, and the catalytic degradation efficiency is improved.

The invention discloses a catalyst composition for processing methylene blue dye wastewater and a preparation method and applications of the catalyst composition. The method includes adding sodium compounds, chromium salts, molybdate and citric acids into water successively, stirring and dissolving the mixture, adding ethylene glycol, heating the mixture to a temperature of 100 DEG C to 130 DEG C, and stirring the mixture continuously to form gel; and heating the gel at a temperature ranging from 600 DEG C to 1200 DEG C for 5 hours to 48 hours to obtain a ternary composite oxide Na2O*Cr2O3*xMoO3 (x=1-8) catalyst. The catalyst can process methylene blue dye wastewater effectively in no need of oxidants or light illumination. As for methylene blue with a concentration of 110mg / L, the degradation rate of the catalyst can achieve more than 90.0% in 75 minutes, and the catalyst can be recycled for a plurality of times.

The invention relates to a reducing-oxidized graphene / amorphous carbon composite material loading Cu / Cu2O photocatalyst as well as a preparation method and application of the composite material. The preparation method of the composite material comprises the following steps: by taking oxidized graphene, glucose or polysaccharide as carbon sources, preparing a reduction-oxidized graphene / amorphous carbon substrate dispersion agent by adopting hydro-thermal synthesis, and then directly adding soluble copper salt into the dispersion agent, so as to further prepare the reducing-oxidized graphene / amorphous carbon composite material loading the Cu / Cu2O photocatalyst by adopting hydro-thermal synthesis. For the obtained composite material, spherical Cu / Cu2O photocatalyst grows on a lamellar reducing-oxidized graphene / amorphous carbon substrate, the reducing-oxidized graphene / amorphous carbon substrate has good hydrophilia, can increase adsorption of Cu / Cu2O photocatalyst on organic pollutants in water body, and can further improve the photocatalytic performance of the Cu / Cu2O photocatalyst, and has great significance on water treatment for purifying organic pollutants in water.

The invention relates to a preparation method of a TiO2-loaded composite photocatalyst. The method comprises the following steps: subjecting a mixed solution of a soluble zinc salt, 2-methylimidazoleand a first organic solvent to a heated reaction in an autoclave, subjecting 2-methylimidazole to deprotonation, self-assembling ZIF-8 from 2-methylimidazole and zinc ions, carrying out filtering, washing and drying, and then, carrying out grinding, so as to obtain ZIF-8 powder; subjecting a hydrolyzable titanium source to a hydrolysis reaction with water in a second organic solvent, so as to obtain a nano-titania containing first solution; concentrating the first solution to improve the concentration of nano-titania sol, so as to obtain a second solution; adding the ZIF-8 powder into the second solution, carrying out thorough mixing through ultrasonic oscillation, and carrying out filtering, washing and drying, thereby obtaining the TiO2 / ZIF-8 composite photocatalyst.

The invention relates to a cobalt complex based on a flexible bipyridine bisamide ligand and benzenedicarboxylic acid, a synthesis method and application thereof. The molecular formula of the cobalt complex is: [Co(L<1>)0.5(5-AIP)]; [Co(L<3>)(5-AIP)]; [Co2(L<1>)2(1, 3-BDC)2].4H2O; and [Co2(L<2>)1.5(1, 2-BDC) (mu2-OH)(mu3-OH)(H2O)].H2O. The synthesis method includes: adding cobalt chloride, the flexible bipyridine bisamide ligand and benzenedicarboxylic acid into deionized water, adjusting the pH value, pouring the mixture into a high-pressure reaction kettle to undergo hydrothermal reaction, and carrying out washing and airing, thus obtaining the cobalt complex based on the flexible bipyridine bisamide ligand and benzenedicarboxylic acid. The cobalt complex provided by the invention has the advantages of: simple synthesis method, easy crystallization, high synthesis yield, strong affinity to water soluble pollutants, good catalytic degradation effect, and exhibition of anti-ferromagnetic coupling behavior, and can be applied as a photocatalytic material and magnetic material.

The invention discloses a preparation method of a nano cellulose-reinforced composite photocatalyst. The preparation method comprises the following steps: (1) dissolving silver nitrate and urea in a suspension liquid of nano cellulose, and then drying to obtain a precursor substance; (2) calcining the precursor substance at 450 to 600 DEG C under an oxygen or air atmosphere to obtain a nano cellulose-reinforced composite photocatalytic material. The invention further discloses the nano cellulose-reinforced composite photocatalyst prepared with the method and application thereof. According to the invention, the strong chemisorption and physical entanglement effect of abundant carboxyl groups, hydroxyl groups and network structures intertwined with the carboxyl groups and hydroxyl groups onnano cellulose chains on Ag+ are innovatively utilized, and the Ag+ is fixed on the surface of carbonized nitrogen, so that the loss of the Ag+ is reduced; at the same time, carbon doping is achieved;and C and Ag synergistically promote the catalytic degradation efficiency of the carbonized nitrogen significantly.

The invention provides a method for degrading organic matters by photoelectrocatalysis, belonging to the technical field of non-organic metal materials and pollutant treatment. A graphene / semiconductor oxide composite structure thin film is prepared on conducting glass by a coating method, wherein the mass ratio of the graphene to the semiconductor oxide is (0.2-1.5%): 1. A thin film electrode prepared by using the method provided by the invention is flat in surface and is firmly combined with a substrate. Due to introduction of the graphene, the transmission of photoproduction electrons in the film is improved; and the photoelectric degrading efficiency is obviously improved by applying a thin film material to an organic material degradation field. The thin film electrode loaded with a composite structure catalyst can be recycled and can be repeatedly used for a plurality of times, so that the secondary pollution to the water quality is avoided in a water treatment process. The method provided by the invention has the advantages of high efficiency and low cost. The method provided by the invention can be used for purifying and treating the organic matters in industrial wastewaterand city domestic sewage.

The invention relates to technical field of degradation catalysis of pollute substance of waste water, in particular to a thermosensitivity recyclable metalloporphyrin visible light degradation catalyst and a preparation method thereof. An existing metalloporphyrin visible light degradation catalyst is bad in water-solubility and difficult to recycle. According to the thermosensitivity recyclable metalloporphyrin visible light degradation catalyst and the preparation method thereof, the light degradation catalyst is a star-shaped polymer, wherein divalent metal ions of the light degradation catalyst is Zn divalent metal ion, Co divalent metal ion or Fe divalent metal ion, and the molecular weight of the light degradation catalyst is ranged from 2000 to 15000. The preparation method of the thermosensitivity recyclable metalloporphyrin visible light degradation catalyst is an atom transfer radical polymerization method which comprises the following steps of: firstly, reaction between 5, 10, 15, and 20-4-hydroxyphenylacetic acid phenyl group porphyrin and metal acetate and generation of porphyrin metal complex, then, halogenating reaction between the porphyrin metal complex and halide and obtaining of atom transfer radical polymerization initiator, and thirdly atom transfer radical polymerization of N-isopropyl acryamide monomer initiated by the initiator and obtaining of an end product, namely the thermosensitivity recyclable metalloporphyrin visible light degradation catalyst. The prepared catalyst is good in water-solubility, capable of adapting to aqueous medium waste water degradation system, and capable of being recycled completely, simply and without being damaged.

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 provides visible-light responding type magnetic compound photocatalyst carbon microspheres-zinc ferrite and silver phosphate (CMSs-ZnFe2O4 and Ag3PO4) with core-shell structures and a preparation method and application of the visible-light responding type magnetic compound photocatalyst carbon microspheres. The CMSs are used as cores, zinc ferrite and silver phosphate are sequentially loaded on the surface of the CMS by a solvothermal method and an in-situ precipitation method, therefore, the compound photocatalyst carbon microspheres-zinc ferrite and silver phosphate with the double core-shell structures is prepared. Compared with pure Ag3PO4, the prepared compound photocatalyst has the advantages of high visible light absorption strength, good magnetic separation property, strong photo corrosion resistance and the like, is applied to treatment of 2,4-dichlorophen non-biodegradable organic wastewater, has high removal rate of 96.56% for 20mg / L of 2,4-dichlorophen solution within 150min, and still has the removal rate up to 86.21% for the 2,4-dichlorophen solution after used repeatedly for four times.

The invention discloses a preparation method of a supported active carbon ozone catalyst. The preparation method comprises following steps: (1) soaking active carbon particles in a KMnO4 water solution, drying, then soaking active carbon particles in a Ce(NO3)3.6H2O water solution, drying, and then burning the active carbon particles in the absence of oxygen to obtain composite active carbon particles; and (2) under the irradiation of ultrasonic waves, washing and activating the composite active carbon particles to obtain the supported active carbon ozone catalyst. According to the preparationmethod, active carbon particles are soaked in a KMnO4 water solution and a Ce(NO3)3.6H2O water solution, dried, burned, and finally washed and activated by ultrasonic waves to obtain the supported active carbon ozone catalyst, which can accelerate decomposition of ozone, and the efficiency of catalytic degradation of organic pollutant is obviously improved under the catalytic effect of ozone.

The invention relates to the technical field of nano photocatalysis, particularly to Bi2WO6 modified TiO2 nanobelt photocatalyst, a preparation method and application thereof. The Bi2WO6 modified TiO2 nanobelt photocatalyst takes the shape of an anatase type nanobelt and is 4.8-5.2 mum in length and 380-420 nm in width. The preparation method of the photocatalyst mainly includes the steps of titanium sheet pretreatment, TiO2 nanobelt forming through the sodium hydroxide solution corrosion method, preparation of Bi2WO6 modified TiO2 nanobelt through the hydrothermal synthesis method and forming of Bi2WO6 modified TiO2 nanobelt photocatalyst through calcination. The prepared Bi2WO6 modified TiO2 nanobelt photocatalyst provided by the invention takes the shape of the anatase type nanobelt, has smaller forbidden bandwidth and larger specific surface area, thereby having the photocatalytic activity for organic substance degradation 25% above higher than that of a pure TiO2 nanobelt, and has excellent cycling stability, can be repeatedly used, and avoids secondary pollution during the photocatalytic degradation.

The invention relates to lamellar nanometer barium titanate and a preparation method thereof, and applications in sewage treatment based on piezoelectric photocatalysis. The method for using the laminar nanometer barium titanate in piezoelectric photocatalytic degradation comprises: (a) weighing lamellar nanometer barium titanate, and adding to a methyl orange solution; (b) magnetically stirring in the dark to reach adsorption-desorption equilibrium; (c) transferring into an ultraviolet light source or / and ultrasonic radiation environment, and carrying out a catalytic degradation reaction; (d)sampling by a syringe, carrying out high-speed centrifugation, and taking the upper layer clarified solution; and (e) measuring the absorbance of the solution by using an ultraviolet-visible spectrophotometer, calculating the degradation rate, and characterizing the catalytic performance of the catalyst. According to the present invention, the piezoelectric photocatalyst BTO can establish the internal field strength based on the piezoelectric effect so as to effectively promote the separation of electrons and holes, such that the photocatalytic efficiency can be improved; and the catalytic degradation efficiency can be improved through the simple experimental operations, the cost is cheap, and the product is safe and non-toxic.

The invention relates to a preparation method and application of a CO<2+>-doped titanium dioxide self-cleaning film. The preparation method comprises the following steps: uniformly mixing dibutyl phthalate with absolute ethyl alcohol, and adding diethanol amine to prepare a transparent solution A; uniformly mixing deionized water, acetylacetone and absolute ethyl alcohol, so as to prepare a transparent solution B; adding cobalt acetate tetrahydrate into the obtained mixed solution, regulating the pH value of the mixed solution to 2.0-5.0, mixing to form uniform sol, and ageing to obtain gel C; soaking a cleaned substrate into the gel C, standing still and repeatedly lifting and coating till obtaining the film with the required thickness, and then sequentially drying and annealing, so as to obtain the CO<2+>-doped titanium dioxide self-cleaning film. The preparation method has the advantages that process devices are simple, the cost is low, the film-forming property and the repetitiveness are good, and the capacity of the prepared film for catalyzing the degradation of methyl orange under the sunlight radiation is obviously higher than that of a titanium dioxide film.

The invention discloses a Fe3O4 @rGO@MIL-100 (Fe) photo-Fenton catalyst and preparation and application thereof. The photo-Fenton catalyst is formed by coating ferroferric oxide, partially-reduced graphene oxide and MIL-100 (Fe) layer by layer. A preparation method of the photo-Fenton catalyst comprises: firstly, preparing ferroferric oxide; then modifying the surface of the ferroferric oxide by 3-aminopropyltriethoxysilane; sequentially coating the graphene oxide and the MIL-100 (Fe); finally, carrying out vacuum high-temperature drying reduction to prepare the photo-Fenton catalyst. The catalyst is applied to photo-Fenton degradation on chlorphenol polluted wastewater, and has an excellent degradation effect; not only is a pH range of a Fenton reaction expanded, and a use amount of a H2O2 reagent is reduced, but also degradation efficiency of the Fenton reaction on the chlorphenol wastewater is greatly improved in the aspect of dynamics, and treatment cost of the chlorphenol wastewater is greatly reduced; the photocatalytic-Fenton catalyst is low in cost and environmental friendly, and has industrialized application prospect.

An ultrasonic-chemical process for preparing the high-activity nano-crystal visual-light photcatalyst BiVO4 for fast degradating organic pollutant is prepared through dissolving the Bi ion contained nitrate (or chloride or oxalate) in distilled water, proportionally adding the V ion contained meta-vanadate, stirring to become yellow suspension, ultrasonic treating to obtain yellow deposit, filtering, washing and drying.

The invention relates to a Fenton-reaction-based improved industrial organic wastewater treatment method which comprises the following steps: adding a magnetic ferrite nano material into industrial organic wastewater according to the proportion of 0.02-0.5 g / L, wherein the size of the magnetic ferrite nano material is 10-20nm; adding H2O2 at one time or in batches, wherein the H2O2 accounts for 1-10 vol% of the industrial organic wastewater; and reacting under ultraviolet irradiation for 2-24 hours; and carrying out magnetic separation to recover the magnetic ferrite nano material. The wastewater treatment method provided by the invention is especially suitable for treating high-COD (chemical oxygen demand) wastewater (with the COD content of greater than 100000 mg / L). By using the nano ferroferric oxide as the catalyst and performing the steps of batch addition of H2O2 and the like, the degradation rate can exceed 75%.

The invention provides a preparation method of a visible light and ozone cooperating catalyst for catalytically degrading organic acid. The preparation method comprises the following steps that 1, manganese acetate is weighed and dissolved in ultrapure water, melamine is added after stirring, and a mixed solution is obtained; 2, the mixed solution is heated while being stirred till water is evaporated to be dry, a mixture is obtained, the mixture is dried, and the dried mixture is obtained; 3, the dried mixture obtained in the step 2 is ground and then calcined, and the calcined mixture is obtained; 4, the calcined mixture obtained in the step 3 is ground and screened, and then the catalyst is obtained. The catalyst is added into the organic acid, ozone is introduced, the organic acid in industrial waste water is catalytically degraded under the condition of visible light illumination, the catalytic degradation efficiency is high, the organic acid in the industrial waste water is effectively treated, and the preparation method is suitable for industrial application.

The invention discloses preparation and application of a graphene composite fiber nonwoven fabric for catalytically degrading neuropathic chemical warfare agents, and belongs to the field of chemicalprevention. MOFs (Metal Organic Frameworks) nanoparticles are synthesized on the surface of fibers by a solvothermal method by using graphene fibers as carriers, wherein the diameter of the graphene fibers is 20 to 100 [mu]m; an MOFs catalyst is UiO-66-NH2; the particle dimension is 50 to 400 nm; and the composite fiber nonwoven fabric is graphene@UiO-66-NH2, and the thickness is 50 to 300 [mu]m.The graphene composite fiber nonwoven fabric is prepared through wet spinning and subsequent vacuum suction filtration, and has an efficient photothermal conversion effect. Under the condition of simulated sunlight, the catalytic degradation half-life period of the graphene@UiO-66-NH2 on an optimum analog of methyl paraoxon of a nerve poison of GD is 1.6 min; complete degradation can be almost realized within 20 min; and excellent capability of fast and catalytically degrading the neuropathic chemical warfare agents is shown.

The invention discloses an organic wastewater catalytic degradation and separation device and method. The device comprises a dilution mechanism, a catalytic degradation and separation mechanism, a first control module and a second control module. The diluting mechanism comprises a diluting box, a stirring mechanism and a stirring driving mechanism. The catalytic degradation separation mechanism comprises a base bracket, a separation chamber, a catalytic mechanism and an aeration mechanism. The separation chamber comprises an upper separation chamber and a middle catalytic degradation chamber and a recovery chamber, wherein a titanium dioxide particle catalyst is arranged in the recovery chamber, and a separation mechanism is arranged in the upper separation chamber. The method comprises the following steps: 1, diluting organic wastewater; 2, conveying the diluted organic wastewater; 3, adding a titanium dioxide particle catalyst; and 4, carrying out catalytic degradation and separationon the diluted organic wastewater. According to the invention, dilution of organic wastewater is realized, catalytic degradation is carried out on the diluted organic wastewater, the catalytic degradation efficiency is improved, and the titanium dioxide particle catalyst can be separated and recovered.

The invention relates to a preparation method of a compound ecological fertilizer from plant stalks. The compound fertilizer is prepared by degrading a main raw material of plant stalks under the action of small molecule organic acid in the presence of a solid super acid catalyst, and combining with distiller's grains, bone meal, bran leather, humic acid, and NPK fertilizer. The raw materials consist of, by weight, 60-80 parts of plant stalks, 5-10 parts of distiller's grains, 5-15 parts of bone meal, 5-15 parts of wheat bran, 5-10 parts of humic acid and 30-50 parts of NPK fertilizer. The method uses a catalytic degradation technology for preparation of the compound ecological fertilizer, reaches high catalytic degradation efficiency of stalks, completes the conversion from stalks to compound ecological fertilizer within 16h at the highest speed, and has the advantages of simple operation, low cost, recyclable catalyst, and no corrosion of equipment, and can quickly obtain the product. The prepared compound ecological fertilizer can effectively enhance fertilizer efficiency, stimulate crop growth, control pests and diseases, improve the quality of agricultural products, and the absorb soil pollutants, improve the water retention capacity of soil and fertilizer and improve soil structure, and is conducive to the sustainable development of agriculture.

The invention relates to a Li2Ni2Mo3O12 catalyst composition and a preparation method and application thereof in the aspect of treating methylene blue industrial wastewater, and belongs to the technical field of inorganic functional material preparation. According to the Li2Ni2Mo3O12 catalyst composition, a lithium compound, nickel salt, molybdate and citric acid are sequentially added to water according to the molar ratio of 1 to 1 to 1.5 to 7-20, stirring is conducted for dissolving, ethylene glycol is added, the temperature rises to range from 100 DEG C to 130 DEG C, continuous stirring is conducted to form gel, the gel is calcined for 4-15 h at the temperature ranging from 400 DEG C to 900 DEG C finally, and the Li2Ni2Mo3O12 catalyst composition is prepared. The catalyst can efficiently catalyze hydrogen peroxide to conduct oxygenolysis on methylene blue dye in industrial wastewater at normal temperature and normal pressure without light irradiation, and the Li2Ni2Mo3O12 catalyst composition and the preparation method and application thereof in the aspect of treating the methylene blue industrial wastewater have the advantages that preparation is easy and rapid, the speed of degrading organic pollutants is high, the effect is significant, the treatment cost is low, and secondary pollution is not produced. In addition, the catalyst can be reused repeatedly, the degradation rates of the Li2Ni2Mo3O12 catalyst to the methylene blue industrial wastewater in second reuse and third reuse both exceed 90.0 percent.

The invention provides a preparation method of an antibacterial and fresh-keeping composite packaging film and relates to a preparation method of a composite packaging film. The composite packaging film provided by the invention is used for solving the problems that the existing antibacterial packaging film is low in nano TiO2 photocatalysis efficiency and inapparent in antibacterial and fresh-keeping effect. The preparation method of the antibacterial and fresh-keeping composite packaging film comprises the following steps of: firstly, dissolving chitosan; secondly, modifying a nano material by adopting powder; thirdly, adding the nano material; fourthly, adding metal ions, thus the preparation method of the composite packaging film with a fresh-keeping function is completed. The preparation method is simple and practicable, Ag exists in an ion form, a uniform film can be easily prepared, and the prepared film is degradable, good in fresh-keeping function and low in cost. The preparation method of the antibacterial and fresh-keeping composite packaging film is applied to the field of antibacterial packaging.

The invention discloses a BiOCOOH / g-C3N4 composite photocatalyst and a preparation method and application thereof and relates to the technical field of photocatalysis. In the BiOCOOH / g-C3N4 compositephotocatalyst, the BiOCOOH is inlaid in the lamellar structure of the g-C3N4; and the molar ratio of the BiOCOOH to the g-C3N4 is (0.15-4.75):1. The composite photocatalyst has stronger visible lightresponse capability, higher photo-induced electron-hole pair separation efficiency, high catalytic activity and high efficiency of visible light catalytic degradation of organic dye-containing wastewater. The preparation method comprises the following steps of synthesizing the composite photocatalyst from the g-C3N4, soluble bismuth salt and a solvent through a hydrothermal method, wherein the molar ratio of the soluble bismuth salt to the g-C3N4 is (0.15-4.75):1. The preparation method has the advantages that the raw materials are cheap and easy to obtain, the process is simple, the operationis simple and convenient, and secondary pollution is avoided.

The invention provides a catalytic purification composite material and a preparation method and application thereof. Activated carbon loaded manganese sand particles are used as a basic framework of the material, and mixed metal oxides as active components are loaded on the outermost layer of the framework. The preparation method of the material comprises the following steps: pretreating manganese sand and removing impurities on the surface of the manganese sand; taking wooden activated carbon or shell activated carbon as an activated carbon precursor; roasting in an inert atmosphere; preparing a porous carbon structure which uses the manganese sand as a framework; and modifying the surface of the manganese sand-porous carbon structure by using the metal oxides to form the novel composite purification material with adsorption and electro-catalyst composite functions. When the catalytic purification composite material is used, the composite material effectively adsorbs and catches low-concentration organic matters in micro-polluted raw water at first, so that pollutants are adsorbed on the surface of the material, then the composite material with adsorption saturation is guided into an electrolytic bath for electrochemical oxidation, the pollutants on the surface of the composite material are desorbed and decomposed, and are thoroughly mineralized into carbon dioxide and water, and meanwhile, recycling of the composite material is realized.

Visible light catalysts used for treatment of methylene blue dye waste water and a preparing method thereof are disclosed. The method adopts a soluble metal salt, vanadium pentoxide and hydrogen peroxide as raw materials and includes stirring and dissolving at 0-10 DEG C, heating to 50-62 DEG C, maintaining the temperature, reacting until no bubble is generated and a precipitate is generated at the bottom, filtering, drying to obtain the precipitate, and calcinating to obtain catalyst powder having a general formula of Mex.V2O5, wherein the soluble metal salt is a soluble sodium salt or a copper salt, the Me is sodium or copper, and the x is 0.2-0.4. The prepared catalysts can effectively degrade methylene blue dye in waste water under irradiation of visible light.

The invention discloses a multifunctional composite filter screen material for an air purifier and a preparation method thereof. The multifunctional composite filter screen material is prepared from the following ingredients in percentage by weight: 5 to 10 mass percent of N-aryl-2-(benzisothiazolin-3-ketone-2-yl)methanamide organic antibacterial agents, 10 to 15 mass percent of Ag-MOFs compositematerials, 25 to 30 mass percent of terbium-doping mesoporous TiO2 nanometer photocatalysts and 50 mass percent of active carbon fiber. The bacteriostasis rate of the composite filter screen materialon escherichia coli can reach 98 percent; the removal rate on formaldehyde reaches up to 99 percent.

The invention discloses a preparation method of a red photonic crystal structure color thin film with a photo-catalytic effect. The method comprises the following steps: firstly mixing SiO2 microsphere powder with particle diameter of 285+ / -5 nm and polyvinylpyrrolidone and then adding water to prepare PVP (Polyvinyl Pyrrolidone)-modified SiO2 microspheres; then adding into absolute ethyl alcohol to perform ultrasonic treatment to obtain emulsion containing SiO2 microspheres; then preparing mixed solution of lithium hydroxide-ethanol and zinc acetate-ethanol; dropwise adding the emulsion containing SiO2 microspheres into the mixed solution, reacting and then filtering, washing, centrifuging, drying and thermally treating precipitate to prepare the SiO2@ZnO core-shell structure microspheres with the photo-catalytic effect; next adding ethanol into the SiO2@ZnO core-shell structure microspheres to perform ultrasonic dispersion to prepare emulsion; finally vertically inserting a glass substrate into the emulsion by using a vertical deposition method to generate the red photonic crystal structure color thin film with the photo-catalytic effect. The method is simple and easy, causes no pollution to environment, can realize large-scale industrial production and has broad application prospect.