58results about How to "Efficient photocatalytic performance" patented technology

The invention relates to the technical field of photocatalysis, particularly to a micronano-structured and silver phosphate based composite visible light catalytic material and a preparing method thereof. The method includes the following steps: dissolving oxidized graphene in water, and performing ultrasonic treatment to obtain an oxidized graphene dispersion liquid; ultrasonically dispersing silver nitrate and zinc oxide in deionized water to obtain a mixed solution, stirring and dropwise adding the solution into the oxidized graphene dispersion liquid, so as to obtain a mixed precursor; slowly and dropwise adding a prepared phosphate solution in the mixed precursor of the oxidized graphene, the silver nitrate and the zinc oxide, and continuously stirring, performing suction filtration on the product, then repeatedly washing the product by the deionized water and absolute ethyl alcohol, and obtaining a composite after vacuum drying. The invention has the advantages that the preparing technology is simple, the required raw materials are abundant, the performance of the product is superior, and motivated by visible light, the catalytic material has stronger degradation activity to organic dyestuff rhodamine B.

The invention discloses a hexagonal boron nitride modified graphitized carbon nitride composite optical catalyst as well as a preparation method and application thereof. According to the composite optical catalyst, by taking graphitized carbon nitride as a carrier, laminated hexagonal boron nitride modifies the graphitized carbon nitride carrier. The preparation method comprises the following steps: mixing the hexagonal boron nitride with a graphitized carbon nitride precursor; and calcining the mixed precursor to obtain the hexagonal boron nitride modified graphitized carbon nitride composite optical catalyst. The hexagonal boron nitride modified graphitized carbon nitride composite optical catalyst disclosed by the invention has the advantages of being environmentally friendly, fully free of metal doping, large in specific surface area, high in photoproduction electron-hole separating efficiency, high in optical catalytic activity, good in stability, corrosion-resistant and the like. The preparation method has the advantages of being simple, low in cost of raw materials, less in energy consumption, easy to control conditions and the like. The composite optical catalyst disclosed by the invention is used for degrading dye wastewater and has the advantages of being simple in application method, stable in optical catalytic performance, high in corrosion resistance, high in dye wastewater degrading efficiency.

The invention relates to preparation and applications of a {001} crystal face controllable exposed titanium dioxide photoelectrode. According to the preparation, a titanium plate is taken as a titanium source, hydrofluoric acid is taken as an end-capping reagent, hydro-thermal method is adopted for in-suit growth of TiO2 flower-shaped microsphere structures on the titanium base plate, the {001} crystal face exposure ratio ranges from 0 to 100%, the obtained {001} TiO2/Ti photoelectrode can be applied in dimethyl phthalate waste water photoelectric catalytic oxidation degradation. Compared withthe prior art, the advantages are that: the {001} crystal face controllable exposed {001} TiO2/Ti photoelectrode is high in photoelectrocatalysis performance (the highest photocurrent density is 0.74mA/cm<2>), the removing rate on 5mg/L dimethyl phthalate in 8h is as high as 94.3%. The electrode material and the technology are suitable to be used in the field of phthalate pollutant photoelectrocatalysis degradation.

The invention discloses a metal organic framework modified stannous sulfide composite photocatalyst as well as a preparation method and application thereof. The composite photocatalyst takes a metal organic framework MIL-53(Fe) as a carrier and is loaded with stannous sulfide. The preparation method of the composite photocatalyst comprises the following steps: mixing MIL-53(Fe) with stannous sulfide, adding solution containing S<2->, and carrying out precipitation reaction, so that the metal organic framework modified stannous sulfide composite photocatalyst is obtained. The composite photocatalyst disclosed by the invention has the advantages of environment friendliness, large specific surface area, many reaction sites, high photogenerated electron-hole utilization rate, high photocatalytic activity, good stability and corrosion resistance, and the preparation method has the advantages of simplicity in operation, low raw material cost, low energy consumption, short consumed time and easy-to-control conditions. The composite photocatalyst disclosed by the invention can be used for degrading hexavalent chromium wastewater, has the advantages of high degradation efficiency, simple application method, low cost and no secondary pollution and has a good practical application prospect.

The invention relates to a photocatalyst and a preparation method and use thereof. The preparation method of the photocatalyst comprises the following steps: dissolving a bismuth source in a dilute nitric acid solution of which the pH is 5.0 to form a clear solution A; ultrasonically dispersing CTAB (cetyltrimethyl ammonium bromide), PVP (polyvinyl pyrrolidone) and a spherical Ni elementary substance in 10mL of ethyl alcohol to form a mixed system B; mixing the clear solution A and the mixed system B, and standing at room temperature to obtain a white precipitate; washing and drying the white precipitate to constant weight. The obtained nano material can be used for degrading toxic and non-degradable organic pollutants, which are discharged from a factory, into non-toxic carbon dioxide and water. The photocatalyst can be repeatedly used, the activity of the photocatalytic performance of the photocatalyst cannot be reduced along with the increase of use frequency, visible light is unique energy needed in a photocatalytic process, and in conclusion, the photocatalyst has a high economic benefit. Therefore, the photocatalyst has potential application prospects in the fields of environmental management and protection so as to have high economic and social benefits.

The invention discloses a preparation method of a polypyrrole/metal-modified Sn3O4 nano composite photocatalytic material. The nano composite material is a composite photocatalyst material obtained byloading and dispersing metal-modified Sn3O4 semiconductor heterojunction on polypyrrole in a chemical bond complexing form; and the metal-modified Sn3O4 is obtained by separately loading metal nano particles of a single-component metal or multi-component alloy of Pt, Au, Ag, Cu and the like having a plasma resonant effect onto Sn3O4. The photo-induced electron-hole separation rate in the photocatalytic reaction can be sufficiently improved by utilizing the visible light photocatalytic oxidation and reduction characteristics of Sn3O4, the plasma resonant effect of metal nano particles, photo conduction and conductivity of polypyrrole as well as the chemical bond heterojunction structure among different components, so that the performance for degrading pollutants in a photocatalytic oxidation and reduction manner and generating hydrogen by photocatalytic and decomposition of water can be improved. The easy-to-mold characteristic of polypyrrole can effectively avoid the recycling difficulty of the powder material.

The invention relates to a preparation method of an Au modified SnO/Sn3O4/SnO2 nano composite photocatalytic material. The nano composite material is obtained by placing chloroauric acid and a tin source into a solvent, a surfactant and a reducing agent and forming chemical bond complexing among composite ingredients of the materials according to an ice salt bath and solvent combined hot wet chemical in-situ synthesis method. The composite material prepared by the invention utilizes a plasma resonance effect of Au metal nanoparticles, an excellent energy level matching heterojunction structureamong composite components of a tin oxide material and excellent electron conduction of Au metal nanoparticles, and implements rapid electron-hole separation in the process of cooperating photocatalytic oxidation and reduction degradation of pollutants with photocatalytic water splitting hydrogen production, thereby improving efficiency of photocatalytic water splitting and photocatalytic rhodamine B degradation of the Au modified SnO/Sn3O4/SnO2 nano composite photocatalytic material.

The invention discloses a preparation method and application of a high-activity cerium dioxide photocatalyst and belongs to the technical field of synthesis of cerium dioxide photocatalysts. Accordingto the technical scheme, the preparation method is characterized by comprising the following steps: dissolving trivalent cerium salt into an alcohol solvent to obtain a uniform solution; adding hydrogen peroxide into the uniform solution; reacting at room temperature for 0.5 to 2h to obtain a mixed solution; adding a sedimentation agent into the mixed solution; regulating the pH (Potential of Hydrogen) of a mixing system to be 7 to 12; continually stirring and reacting for 0.5 to 2h; carrying out centrifugal separation on sediment in a reaction solution and washing with de-ionized water; drying sediment at 40 to 300 DEG C for 0.5 to 12h to obtain a high-activity cerium dioxide nano-material. The photocatalytic material prepared by the invention has efficient photocatalytic performance, can be used for effectively degrading organic pollutants under sunlight or visible light irradiation and hopefully has good social and economic benefits in the field of environment management.

The invention relates to a photocatalyst for removing volatile organic compounds (VOCs) contained in fresh air which is inhaled into indoor by a fresh air system. A hydrothermal synthesis method is used for preparing a TiO2 material with a mesoporous structure and a high photocatalytic activity, and a photocatalyst prepared by the method has the mesoporous structure and high photocatalysis efficiency for removing formaldehyde. The invention is characterized in that a preparation method comprises the following steps: a certain amount of titanium alkoxide is dissolved into absolute ethyl alcohol, and a solution A is prepared; a template whose mass percentage is 15-35% and a chelating agent whose mass percentage is 10-25% (the mass percentages are calculated based on the titanium alkoxide raw material) are dissolved into deionized water, and a solution B is prepared; the solution A and the solution B are mixed in order to prepare suspension liquid; the suspension liquid is transferred to a crystallization reaction vessel whose inner liner is made from polytetrafluoroethylene, a reaction is carried out at 150-220 DEG C for 6-24 hours, the reaction vessel is cooled to a room temperature, centrifugation is carried out for reaction products in order to obtain precipitation, deionized water and absolute ethyl alcohol are used for cleaning for 5-10 times, pumping filtration is carried out in order to obtain a sample, and the sample is dried in a baking oven at 100-120 DEG C for 12-24 hours in order to obtain powder; the powder is placed in a muffle furnace, the muffle furnace is heated at a speed of 1-5 DEG C/min to 450-650 DEG C, calcination is carried out for 3-5 hours, and the TiO2 photocatalyst with the mesoporous structure is obtained.

The invention discloses a ternary composite catalytic material for removing tetracycline in wastewater and a preparation method of the ternary composite catalytic material. The preparation method comprises the following steps: (1) preparing g-C3N4; (2) preparing Bi12O15Cl6 ; (3) preparing a Bi12O15Cl6/g-C3N4 binary composite material; and (4) preparing the AgCl/ Bi12O15Cl6/g-C3N4 ternary composite catalytic material. The prepared ternary composite catalytic material can be used for degrading tetracycline under the visible light condition. The ternary photocatalyst is synthesized through a wet impregnation method, and the method has the advantages of being simple in operation method and easy to implement. AgCl and Bi12O15Cl6 are doped on g-C3N4, so that the utilization rate of g-C3N4 to visible light is effectively improved, the separation efficiency of photon-generated carriers is promoted, and the visible light catalysis efficiency is further improved; and the process flow is simple and convenient to operate, and has a great application prospect in the aspect of sewage treatment.

The invention relates to a method for preparing a three-dimensional layered Ti-Fe alloy oxide photonic crystal electrode (Ti-Fe-O NTPC) with a high periodicity. The photonic crystal electrode is prepared by using ferrotitanium as a substrate and using a three-step electrochemical anodizing method. Compared with a conventional nanotube structure and a layered titanium dioxide nanotube without doped ferrum, the Ti-Fe-O NTPC novel electrode has high-efficient visible photoelectrocatalysis performance because the Ti-Fe-O NTPC has a high-periodicity ordered nanometer net which can be used as photonic crystal layer to increase light absorption and the use of the alloy substrate guarantees uniform doping of Fe and Ti at an atom level so as to promote electron transmission. The electrode has potential application value in the field of photocatalysis, photoelectrocatalysis, and new energy preparation and analysis detection.

The invention discloses a composite photocatalyst for degrading tetracycline and a preparation method and application thereof, and relates to the field of photocatalysis. The composite photocatalyst takes a metal organic framework UiO-66 (NH2) as a carrier, and the metal organic framework UiO-66 (NH2) is modified with granular silver iodide; the composite photocatalyst is a binary composite material AgI/UiO-66(NH2) with a Z-type heterojunction structure. The preparation method thereof comprises the following steps of mixing the metal organic framework UiO-66 (NHS) with a silver iodide precursor, and performing chemical precipitation on the obtained mixture to obtain silver iodide modified metal organic framework UiO-66 (NHS) binary composite photocatalyst. The silver iodide modified metalorganic framework UiO-66 (NH2) binary composite photocatalyst has the advantages of being environment-friendly, large in specific surface area, high in photoproduction electron-hole separation efficiency, high in photocatalytic activity, good in stability, light in corrosion resistance and the like, and the preparation method has the advantages of being simple, low in raw material cost, less in energy consumption, short in time consumption, easy to control conditions and the like.

The invention discloses a method for preparing biomass carbon-based metal-modified self-doped vacancy-rich tin oxide nano-composite materials. The method includes loading and dispersing metal-modifiedself-doped vacancy-rich tin oxide semiconductor heterojunctions in biomass carbon bases in chemical bond complexation forms to obtain composite photocatalyst materials. Self-doped vacancy-rich tin oxide is selected from Sn-doped nonstoichiometric or mixed valence state oxygen-vacancy-rich tin oxide; metal nano-particles with plasma resonance effects are loaded on self-doped vacancy-rich tin oxidenano-particles to obtain metal-modified self-doped vacancy-rich tin oxide. The method has the advantages that the photo-induced electron-hole separation rate of the biomass carbon-based metal-modified self-doped vacancy-rich tin oxide nano-composite materials can be sufficiently increased during photocatalytic reaction by the aid of the visible-light photocatalytic oxidation and reduction characteristics of the self-doped vacancy-rich tin oxide, the plasma resonance effects of the metal nano-particles, the electric conductivity of biomass carbon-based materials and chemical bonding heterojunction structures between three components, and accordingly the method is favorable for improving the photocatalytic oxidation and reduction pollutant degradation and photocatalytic water decompositionhydrogen production performance of the biomass carbon-based metal-modified self-doped vacancy-rich tin oxide nano-composite materials.

The invention relates to a WXTiO2+3X/SiO2 aerogel compound photocatalyst and a preparation method thereof, and belongs to the technical field of adsorption/photocatalystic materials for environment purification. SiO2 aerogel acts as a carrier of the WXTiO2+3X/SiO2 aerogel compound photocatalyst; a duct and the surface of the SiO2 aerogel are loaded with anatase type WxTiO2+3x particles; the WXTiO2+3X/SiO2 aerogel compound photocatalyst has the specific surface area of 190-350m<2>/g, and has the pore volume of 0.6-1.50ml/g, wherein the mole ratio of SiO2 aerogel to WxTiO2+3x is (0.06:1) to (1.5:1), and x=0.005-0.15. The mesoporous WXTiO2+3X/SiO2 aerogel compound prepared by the invention not only has an efficient adsorption performance, but also has an excellent visible light catalysis performance; harmful pollutants in air and water can be effectively removed effectively via the synergism of adsorption and photocatalysis; the WXTiO2+3X/SiO2 aerogel compound photocatalyst and the preparation method thereof have wide application prospect in the fields of environment purification of air purification, water purification and the like.

The invention relates to a three-dimensional TiO2 photoelectrode with efficient visible light response as well as construction and application thereof. A preparation process of the photoelectrode comprises the following steps: firstly performing in-situ growing of {001}TiO2 microspheres with nearly 100% exposed {001} crystal faces on a titanium mesh through hydrothermal reaction, with the titaniummesh being adopted as a titanium source and hydrofluoric acid being adopted as an end-capping reagent; and loading CQDs on the surfaces of the {001}TiO2 microspheres through hydrothermal treatment toobtain a CQDs-{001}TiO2/Ti photoelectrode with a three-dimensional structure, namely a target product. Compared with the prior art, the prepared three-dimensional TiO2 photoelectrode has efficient and very stable photoelectrocatalysis performance and the like under visible light.

The invention belongs to the technical field of nanocomposite photocatalysis, and particularly relates to preparation of a one-dimensional nanotubular Ag/AgCl/AgBr composite heterojunction visible light catalyst and application thereof. In the invention, a copper nanowire template is obtained by a water bath method, silver nitrate is introduced, a reaction is performed to obtain a one-dimensionalsilver nanotube carrier with relatively good uniformity, and then ferric chloride hexahydrate and a certain amount of potassium bromide are added to obtain the one-dimensional nanotubular Ag/AgCl/AgBrcomposite heterojunction visible light catalyst through an ion exchange reaction. The one-dimensional three-component composite heterojunction photocatalyst adopting a tubular structure contains an inner layer surface and an outer layer surface, so that reactive sites are increased; the presence of heterojunctions greatly reduces the composite rate of photoelectron-hole pairs; under the conditionof visible light irradiation, the photocatalytic activity and the stability are greatly improved; the one-dimensional nanotubular Ag/AgCl/AgBr composite heterojunction visible light catalyst can degrade dye macromolecules effectively, and has a very good practical value in environmental protection fields such as wastewater treatment. The preparation method of the one-dimensional nanotubular Ag/AgCl/AgBr composite heterojunction visible light catalyst is easy to operate, mild in reaction condition, short in cycle and environment-friendly.

The invention belongs to the technical field of photocatalysis, and particularly relates to a preparation method of a Fe3O4/polypyrrole/polyaniline/TiO2/ZnO composite material. The preparation methodof the Fe3O4/polypyrrole/polyaniline/TiO2/ZnO composite material comprises the following steps: firstly, reacting ferrous chloride, potassium sulfite, polyvinylpyrrolidone and potassium hydroxide at constant temperature to prepare Fe3O4; then adding pyrrole, ethanol and concentrated hydrochloric acid into Fe3O4 dispersion respectively to obtain Fe3O4/polypyrrole, adding an aniline monomer, hydrochloric acid and ammonium persulfate into Fe3O4/polypyrrole dispersion to prepare Fe3O4/polypyrrole/polyaniline, and coating the surface of the Fe3O4/polypyrrole/polyaniline with TiO2 by a sol-gel mode;and finally, dispersing Fe3O4/polypyrrole/polyaniline/TiO2/ZnO in acetone, adding ammonia water, carrying out ultrasonic dispersion, adding zinc gluconate for reaction, and preparing the Fe3O4/polypyrrole/polyaniline/TiO2/ZnO composite material. The preparation method is simple, the composite material has high saturated magnetization and magnetic recovery rate, and the prepared Fe3O4/polypyrrole/polyaniline/TiO2/ZnO composite material has long-term and high-efficiency photocatalytic performance and magnetic recovery performance.

The invention provides a photocatalytic material for degrading antibiotics. The photocatalytic material is a Z-type photocatalytic material, and the active component of the photocatalytic material is a Z-type Bi2O3/P-C3N4 heterojunction. Experiments prove that 89.2% of levofloxacin can be degraded within 75 minutes. After being recycled for four times, the photocatalytic material (Bi2O3/P-C3N4) still shows efficient photocatalytic performance, and the degradation efficiency still reaches 80% after being recycled for four times, which shows that the photocatalytic material (Bi2O3/P-C3N4) is stable in photocatalytic performance, high in corrosion resistance and high in levofloxacin degradation efficiency, and is a composite photocatalytic material high in degradation efficiency and good in reusability.