53results about How to "Improve photocatalysis" patented technology

The invention relates to a kieselguhr-based porous ceramics, a preparation method thereof and a method for loading Ag doped with nano TiO2 on the same, belonging to the technical field of a kieselguhr inorganic material. The kieselguhr-based porous ceramics is made from kieselguhr, a sintering auxiliary agent, a dispersing agent, a binder and water in the weight ratio of 60-92:8-40:0.01-2:0:001-1:100-450. The kieselguhr-based porous ceramics has functions of absorption and filtration, and can absorb granules in fluid when the fluid passes through the lieselguhr-based porous ceramics. Ag doped with nano TiO2 is loaded on the kieselguhr-based porous ceramics to generate kieselguhr-based porous ceramics loading the Ag doped with TiO2. The laden anatase-type nano TiO2 has large specific surface area. The effects of filtration, photochemical catalysis and sterilization of the kieselguhr-based porous ceramics loading the Ag doped with nano TiO2 are greatly increased.

The invention discloses a flower-shaped mesoporous titanium dioxide material and a preparation method and application thereof. The material is prepared by the following method: 1) adding a template agent into a diluent, adding concentrated hydrochloric acid, and stirring evenly; 2) adding a titanium source into the solution, and stirring; 3) placing the solution in the conditions of the relative humidity above 60% at the temperature of 40-80 DEG C for 12h-24h, crystallizing at 80-90 DEG C for 6-12h; and 4) refluxing a sample to remove a surface active agent, and drying to obtain the flower-shaped mesoporous titanium dioxide. According to the method, high-temperature calcinations is not needed, the reaction synthesis temperature is lower than 100 DEG C, and the obtained flower-shaped mesoporous titanium dioxide material has the advantages of good monodispersity, high specific surface area and controllable crystalline phase and the like. The flower-shaped mesoporous titanium dioxide material can be used for negative electrode materials of a lithium ion battery, has high charge and discharge specific capacity, stable cycle performance, excellent high rate performance and very good photocatalytic activity, and can be used in the fields of degradation of organic pollutants, photocatalytic water splitting for hydrogen production, dye-sensitized solar cells and the like.

The invention relates to a modified bamboo-carbon product and the manufacturing method. In detail, it is the porous TiO2 bamboo-carbon product with Ag on the surface and high specific surface area, notable photocatalysis and antibacterial performances and the manufacturing method. The porous TiO2 modified bamboo-carbon with Ag on the surface comprises pretreated bamboo-carbon material and TiO2 nanometer sol doped pore-making agent Ag / N filled in bamboo-carbon duct or vascular bundle. The TiO2 nanometer sol doped pore-making agent Ag / N comprises TiO2 sol particle, pore-making agent, nitrogen doped component and Ag+. No only the invention changes the distribution of pore channels but also pore channels can not be jammed. So it can improve bamboo-carbon specific surface area in effect and increases absorption and the concentration of anion. At the same time, when there is no light source, the abundant Ag on the surface is made use of so that the bamboo-carbon is provided with permanent antibacterial performance. The invention provides important bamboo-carbon material with high quality for develop the bamboo-carbon application area.

The invention discloses a method for preparing a carbon boron nitrogen doped double-tube titania nanotube array from ionic liquid on a titanium base, which comprises the steps that ionic liquid and organic solution are used as electrolyte, a titanium sheet is used as an anode, a platinum sheet is used as a cathode, the titanium sheet is anodized in ultrasonic bath, a carbon boron nitrogen doped double-tube TiO nanotube array is synthesized on the titanium base by self-assembly, and the sample is calcined in a nitrogen atmosphere tube furnace after washed and dried. The invention further extends light response range and enhances response capability to visible light through three-element doping, saves energy and has the advantages of simplicity in operation, adjustable design and composite structure, and high practical application value.

The invention relates to a web-type three-dimensional perforated macroporous-mesoporous-structure titanium dioxide material, and a preparation method and application thereof. The material is formed by regulating the self-assembly of biomolecules; the crystal form is anatase; on the basis of the macroporous structure formed by accumulation of titanium dioxide particles, the embedded mesopores are regulated on the macroporous structure, and the pore wall and particles thereof, thereby forming the three-dimensional perforated macroporous-mesoporous structure; and the pore size of the macropores is 90-100nm, the pore wall thick is 8-10nm, and the pore size of the mesopores distributed in the titanium dioxide particles is 3-5nm. Compared with the prior art, the material provided by the invention has the advantages of simple preparation process and non-severe technological conditions, and can implement large-scale industrial production; and the method is safer and cleaner to operate. The material has the special macroporous-mesoporous perforated pore structure, and thus, is beneficial to transfer and embedment of lithium ions, thereby enhancing the electrochemical properties. The material obtains higher reversible capacity and excellent cycle performance.

The invention belongs to the technical field of functional materials and in particular relates to a gradient-structured metal oxide used for an anode and cathode material of a fuel cell as well as a reaction catalytic material of gas, liquid and solid phases and a preparation method thereof. The metal oxide has a heterogeneous structure which is formed from two or more elements, wherein one element is firstly to form a seed crystal, and then the second or more elements are added gradually to form the heterogeneous structures of different oxides. According to the gradient-structured metal oxide and the preparation method thereof, disclosed by the invention, efficiency of the gradient-structured metal oxide serving as a photocatalyst is improved or polarization of an electrochemical reaction process is reduced, and electrochemical efficiency is improved; and in comparison with traditional oxides with uniform structure, the gradient-structured metal oxide has higher photo-catalysis or electro-catalysis efficiency.

The invention discloses a seawater purifying and desalting treatment device and application, and provides application of a MoO3-x nano material to seawater purifying and desalting treatment, wherein xis greater than zero and less than 1; and the invention further provides a seawater purifying and desalting treatment device which is made of the MoO3-x nano material. The invention aims to provide amaterial which can simultaneously achieve seawater purifying and desalting and design an apparatus capable of effectively collecting fresh water. By conditioning the concentration of oxygen vacancy in MoO3-x and analyzing the influence of the concentration of oxygen vacancy on the SPR (surface plasma resonance) effect, and utilizing the SPR effect to improve the photocatalysis and optical heat efficiency, the purposes of efficient achievement of purifying and desalting are realized simultaneously. The seawater purifying and desalting device provided by the invention is easy and practical, thetwo-step operation is completed by utilizing one material, the cost is lowered, the treatment procedure is simplified, and meanwhile, the photocatalytic degradation rate is high, and the optical heatperformance is good.

The invention discloses rod-like cobalt ferrite powder and a preparation method thereof. The preparation method comprises the following steps: taking Co(NO3)2.6H2O and Fe(NO3)3.9H2O as raw materials, preparing granular cobalt ferrite powder by adopting a sol-gel method, then taking N,N-dimethyl formamide as a solvent, hydrazine hydrate as a reducing agent and methyl mercaptoacetate as a complexing agent, and under the protection of nitrogen, further corroding the cobalt ferrite powder by adopting a one-step corrosion method, so that cobalt ferrite with a rod-like structure is obtained. The rod-like cobalt ferrite powder disclosed by the invention has the advantages that preparation process is simple in operation, and the period is short; and the prepared rod-like cobalt ferrite has the diameter about 90-100nm and the length about 600-700nm and is uniform in size, and the rod-like structure enables the specific surface area of cobalt ferrite to be increased.

The invention provides an antibacterial environment-friendly negative ion quartz stone countertop material and a preparation method thereof. The method includes mixing nano negative ion powder and a titanium dioxide porous nanotube firstly; mixing with other components of a glaze material; then glazing on a brick blank body; and finally sintering to obtain the antibacterial environment-friendly negative ion quartz stone countertop material. As the nano negative ion powder and the titanium dioxide porous nanotube are used together, a synergistic effect is generated; as tourmaline powder is moreeasily stimulated by external energy to generate negative ions, the photocatalysis and antibacterial effects of titanium dioxide are enhanced, so that the antibacterial and environmental protection effects of the quartz stone countertop material are improved on the basis of not increasing the contents of the negative ion powder and the antibacterial agent; and when the quartz stone countertop material is used in indoor decoration, the contents of harmful gases such as indoor formaldehyde, benzene and the like can be obviously reduced, and the proliferation of bacteria is inhibited at the sametime.

The invention provides a firecracker-shaped titanium dioxide / polyimide nano hybrid fiber preparation method. The preparation method includes: subjecting dianhydride and diamine monomers to polycondensation to obtain a polyamide acid solution, preparing a polyamic acid solution through an electrostatic spinning technology, and obtaining polyimide fibers through a thermal imidization process; enabling polyimide nanofibers, titanium foil and hydrochloric acid to react in a high-pressure reaction kettle to obtain firecracker-shaped titanium dioxide / polyimide nano hybrid fibers.

The invention relates to a preparation method for a semi-core-shell Au / Cu2-xS heterogenous nano-material. The method comprises the following steps: S1. preparing a nano gold colloid solution in a cetyl trimethyl ammonium bromide system, wherein the particle size of nano gold is 18nm to 22nm; S2. carrying out a vacuum reaction in the presence of hexamethylene tetramine by employing an aqueous phasesynthesis method in a manner of taking the nano gold as a growth substrate, taking thioacetamide and cupric acetate as precursors, taking ascorbic acid as a reducer and taking cetyl trimethyl ammonium bromide as an auxiliary growth agent, so as to obtain an aqueous solution of the semi-core-shell Au / Cu2-xS heterogenous nano-material; and S3. carrying out separating, washing and drying, thereby obtaining the semi-core-shell Au / Cu2-xS heterogenous nano-material. The method is simple and controllable, and the prepared semi-core-shell Au / Cu2-xS heterogenous nano-material has a yield higher than 97% and has excellent bis-plasmon reinforced photocatalytic and multiphase Fenton catalytic activity.

The invention provides a CNX / TiO2 core-shell nanowire array and a manufacture method thereof. The manufacture method comprises: soaking a conductive substrate in n-hexane solution of titanium tetrachloride, taking out the conductive substrate, and treating at a high temperature to obtain the substrate with a TiO2 seed layer; mixing well methylbenzene, tetrabutyl titanate, concentrated hydrochloricacid and titanium tetrachloride to obtain a liquid mixture; soaking the substrate with the TiO2 seed layer in the liquid mixture, carrying out hydrothermal reaction, cooling, washing with absolute ethyl alcohol, and treating at a high temperature to obtain the substrate with a TiO2 nanowire array; dissolving dicyandiamide and 4,5-dicyanoimidazole in water, drying by water bath evaporation, grinding into powder, mixing with the powder with the substrate with the TiO2 nanowire array, and treating at a high temperature to obtain the CNX / TiO2 core-shell nanowire array. The CNX / TiO2 core-shell nanowire array has good light-absorbing performance and photoelectric catalytic degradation, has a visible light absorbing range expansible to 550 nm and above, and can well photoelectrically catalyze methylene blue.

The invention relates to a preparation method of a V-N co-doped TiO2 / MoS2 composite photocatalysis material, and belongs to the technical field of preparation of a photocatalysis material. The preparation method comprises the following steps: enabling V-N to enter TiO2 crystal lattices in a clearance mode; and compounding V-N to MoS2 to form a special structure. More active sites in photocatalysisreaction is provided, adsorption and transmission of substances in a catalytic process are facilitated, and photocatalysis is enhanced by adsorption synergy. TiO2 band gaps are reduced by co-doping,ability of absorption of TiO2 to ultraviolet visible light is enhanced, TiO2 is compounded to MoS2, energy pole energy between TiO2 AND MoS2 is changed, by the band gaps which are narrow enough, valence electrons can be excited to a conduction band after absorbing the visible light, a photoresponse range is enhanced, and photocatalytic performance is enhanced. The prepared composite material is subjected to photoinduction to generate high electron and cavity separation rate, photo-induced electrons can be quite easily migrated to the surface from an inner region of the photocatalysis materialto participate reaction, by enhancement of electric charge carrier separation, more active oxygen groups are increased, and thus, the photocatalysis degradation ability is improved.

The invention relates to a novel zero-dimensional ZnSe-two-dimensional SnSe heterojunction catalyst as well as preparation and application of the novel zero-dimensional ZnSe-two-dimensional SnSe heterojunction catalyst. The method comprises the following steps: mixing SnCl2, SeO2, oleamide, hydrazine hydrate and water to form a precursor solution, and putting the precursor solution into a hydrothermal reaction kettle for hydrothermal reaction to obtain two-dimensional nano-sheet SnSe; the preparation method comprises the following steps: mixing two-dimensional nano-sheet SnSe, ZnNO3. 6H2O, SeO2, sodium hexadecyl benzene sulfonate, hydrazine hydrate and water to obtain a precursor solution, putting the precursor solution into a hydrothermal reaction kettle, and carrying out secondary hydrothermal reaction to obtain the zero-dimensional ZnSe-two-dimensional SnSe heterojunction catalyst. The photocatalytic degradation performance of the zero-dimensional ZnSe-two-dimensional SnSe heterojunction catalyst prepared by the preparation scheme is obviously enhanced, and the degradation rates of the zero-dimensional ZnSe-two-dimensional SnSe heterojunction catalyst for photocatalytic degradation of methylene blue and levofloxacin are 3.8 times and 1.7 times of those of a single SnSe product respectively. The method is simple in process, easy to control and high in production efficiency.

The invention discloses hierarchical TiO2 adopting a mixed structure and a preparation method of hierarchical TiO2. TBT (tetrabutyl titanate) is taken as a Ti source, a triblock copolymer P123 is taken as a structure-directing agent, acetic acid is taken as a solvent, and hierarchical TiO2 adopting the mixed structure is prepared through a solvent heating process and high-temperature calcination. The prepared hierarchical TiO2 adopting the mixed structure comprises flower-like microspheres and single-crystal anatase type mesoporous TiO2 nanospheres, the flower-like microspheres comprise polycrystal anatase type TiO2 nanosheets, the diameter of each flower-like microsphere is 1-1.5 mu m, the thickness of each nanosheet is 10-13 nm, and the diameter of each mesoporous nanosphere is about 180-220 nm. The prepared material has larger specific surface area and rich double-mesopore porous structure, has single morphology and good dispersity and can be taken as a photocatalyst and a lithium ion battery anode material.

The invention discloses a high-strength easily degradable modified polyethylene film and a preparation method thereof and belongs to the technical field of easily degradable modified polyethylene films. The formula in the invention comprises polyethylene, ultra high molecular weight polyethylene, glass fibers, hydrophilic modified polyurea coated nanometer copper oxide mimic enzymes, octacalcium phosphate, nano-zinc oxide, N,N-methylene bisacrylamide, triethylene tetramine, an epoxy silane coupling agent, poly(vinyl ether), propylgallate, a glycidyl methacrylate grafted octylene-ethylene copolymer, maleic anhydride, polylactic acid, carboxymethyl starch, citric acid and a plasticizer. The polyethylene and nano powder are subjected to green and low-energy-consumption compatibility, hydrophilcity, reinforcing and toughening, photocatalysis and thermal oxidation promoted modification, and by virtue of the technical means of one-step cold grinding modification and further repeated melt co-extrusion modification, the modified polyethylene is prepared. The prepared modified polyethylene has synchronously enhanced mechanical property and good degradation property, and the process is simple, low in cost and easy for industrial production.

The invention provides a preparation method of composite white carbon black, the preparation method comprises the following steps: preparing a sodium silicate solution with a certain concentration, adding a certain amount of surfactant, and stirring; performing water bath constant temperature of 40-100 DEG C on the sodium silicate solution, performing continuous mechanical high-speed stirring, adding a TiCl4 solution with a certain concentration, and controlling the adding speed; and preparing silicon dioxide with high specific surface area by using a precipitation process to coat the coprecipitation core, thereby obtaining the composite white carbon black. According to the invention, silicon dioxide with high specific surface area is prepared by utilizing a carbonization process to coat the coprecipitation core, so that the inner-layer coprecipitation core is protected, and the material is prevented from shelling. The firmness of the material is guaranteed, and compared with sulfuric acid used by a traditional precipitation method for preparing white carbon black, carbon dioxide is less in harmfulness and low in cost. Carbon dioxide is absorbed, and environmental protection is achieved.

The invention provides a growth method of a micro-nano functional material and an application thereof in quantum dot cell. The method utilizes the special growth dynamics of a liquid membrane near the interface between gas and liquid to perfectly synthesize a nano material with a stereo and layered structure. The invention also provides a micro-nano functional material prepared by the preparation method mentioned above, a quantum dot sensitized solar cell, a device for preparing the micro-nano functional material, and an application of the micro-nano functional material. The manufacturing technology of the invention ingeniously utilizes a chemical method and forces existing in the nature such as capillary force, convection force, and the like to carry out nano material self-assembly. The growth method provided by the invention can be used to prepare nano materials, and has the advantages of low cost, high repeatability, and easy industrialization.

The invention discloses a preparation method of a meso-porous surface defect Cu-N-TiO2 microsphere photocatalytic material. The method comprises the following steps: 1) dissolving a surfactant in ethanol, and sequentially adding an ethanol solution of a copper-containing compound and deionized water while stirring, then adding a titanium-containing compound, continuously performing stirring for 30-50 s, standing the obtained solution to settle, and filtering the solution to obtain a precipitate; and 2) washing the precipitate with ethanol and / or water for 3 times or more, drying and grinding the washed precipitate to form a powder, hydrothermally reacting the powder, calcining a product obtained by the hydrothermal reaction in an air atmosphere, and carrying out high-temperature nitridingtreatment to obtain the meso-porous surface defect Cu-N-TiO2 microsphere photocatalytic material. The prepared microsphere photocatalytic material has uniform pores, good material dispersibility, large specific surface area and high photocatalytic efficiency.

The invention relates to a device and a method for treating a landfill leachate membrane separation concentrated solution through surface photo-thermal evaporation, and belongs to the technical field of landfill leachate membrane concentrated solution treatment. The device comprises a condensing lens, a reaction tank, an evaporation table, a hydrophilic porous material layer, a photo-thermal porous material layer, an inclined transparent condensation top cover, a transparent side wall, a crystal salt collection box, a condensate water collection tank and a condensate water outlet, the condensing lens is embedded into the inclined transparent condensing top cover; the inclined transparent condensation top cover and the transparent side wall are arranged above the crystal salt collecting box in a covering mode; the reaction tank is arranged in the crystal salt collecting box; the evaporation table is located at the edge of the reaction tank, the hydrophilic porous material layer and a photo-thermal porous material layer are sequentially attached to the evaporation table from bottom to top, and the hydrophilic porous material layer extends to the side wall of the reaction tank; the condensate water collection tank is located around the inner wall of the transparent side wall. Air internal circulation exists in the reactor, air convection on the surface of the photo-thermal material is promoted, and the surface evaporation rate of the photo-thermal material is increased.

The invention relates to an application of Cu Ce co-doping in improvement of photocatalysis performance of ZnO micropowder. A copper solution is quantified through a sol-gel method, and then a zinc solution and a cerium nitrate solution are mixed according to different ratios (with a formula being Zn<0.97-X>Cu<0.03>Ce<X>O, and the X being 0.00, 0.02, 0.04, 0.06, 0.08 and 0.10). Along with increases of the doping concentration of Ce that is a rare earth element, SEM photo analysis of the Zn<0.97-X>Cu<0.03>Ce<X>O system proves that doping has certain influences on morphology of ZnO, improvements of dimension uniformity and dispersibility of doped sample particles can facilitate suspension dispersion of a catalyst and can promote light absorption and reactant molecule adsorption by the catalyst so that the photocatalysis performance of a sample is better, and the photocatalysis rate of the ZnO sample is obviously increased along with increases of the doping amount of Ce<3+>. The changing graph of the total degradation rate along with time is near a straight line, and does not trend to decrease along with increases of the doping amount of the Ce<3+>. Assumedly, satisfactory photocatalysis effects are expected to be achieved if the doping amount of the Ce<3+> continues to increase.

The invention belongs to the technical field of photocatalysis and specifically relates to a method for synergistically enhancing photocatalysis of ZnO through plasmon and ammonia passivation. The method comprises the following steps: performing ammonia passivation treatment on a photocatalytic material, namely ZnO, preparing a metal Ag film on the surface of the photocatalytic material ZnO with athermal induction method and forming metal Ag nano-particles under an annealing condition (the diameter is less than 50 nm.). The doping of nitrogen elements can be achieved through ammonia passivation; due to nitrogen doping, a band gap can be reduced, and visible light photocatalysis is achieved; sunlight with the resonant wavelength within a visible light band (400-700 nm) can be effectively captured through plasmon, so that a light-generated electron hole pair is generated. Therefore, through combination of the two methods of ammonia passivation and plasmon, the photoelectric response andphotocatalysis efficiency of a ZnO photocatalyst can be effectively improved.

The invention relates to a method for improving the performance of an organic-inorganic composite material. By using the method, an organic polymer covering surfaces of micro-nano particles in the composite material is selectively etched and removed, so that inorganic micro-nano particles loaded on the surfaces are partially exposed out of the surfaces of the polymer and fibers, and the surface roughness is deepened, so that the functionality of the inorganic micro-nano particles can be really exerted. Meanwhile, due to the improvement of plasma permeability, the interior of the fiber fabric can be fully treated and etched, the exposure proportion of the micro-nano particles is increased, and the performance of the composite material is further improved. The high specific surface area of the fiber fabric and the inorganic micro-nano particles fully exposed inside and outside can fully endow the composite material with greatly improved functional characteristics. According to the inorganic-organic composite material and product prepared based on large-scale industrial blending, the blending preparation and plasma etching process is environmentally friendly and efficient, and the technological process is mature and easy to implement.

The invention relates to Ptn-MxWO3 / SiO2 composite aerogel and a preparation method thereof, and belongs to the technical field of new materials and energy conservation and environmental protection. According to the Ptn-MxWO3 / SiO2 composite aerogel, the whole Ptn-MxWO3 / SiO2 composite aerogel is of a porous network structure, the specific surface area of the composite aerogel is 100-300 m<2> / g, thepore volume is 0.4-2.0 cm <3> / g, and the pore diameter is 5-25 nm; and Ptn-MxWO3 nanorod-shaped crystal grains are embedded into the composite aerogel porous network structure, and have a hexagonal tungsten bronze MyWO3 crystal structure, M in MyWO3 is Li, Na, K, Rb, Cs or NH4, y is equal to 0.2-0.7, and n is equal to 0.001-0.1. The Ptn-MxWO3 / SiO2 composite aerogel provided by the invention has visible light transmission, near-infrared shielding performance, heat insulation and pollutant adsorption / photocatalytic degradation performance at the same time.

The invention relates to the application of Cu and Ce co-doping to improve the photocatalytic performance of ZnO micron powder. The copper solution is quantified by the sol-gel method, and then the zinc solution and the cerium nitrate solution are mixed according to different proportions (Zn0.97-XCu0.03CeXO, X=0.00, 0.02, 0.04, 0.06, 0.08, 0.10), as the doping concentration of the rare earth element Ce increases, the SEM photo analysis of the Zn0.97- Influence, the uniformization of particle size and improvement of dispersion performance of the sample after doping will be beneficial to the suspension and dispersion of the catalyst, and can also promote the absorption of light by the catalyst and the adsorption of reactant molecules, making the photocatalytic performance of the sample better; with As the Ce3+ content increases, the photocatalytic rate of ZnO samples has been significantly enhanced. Moreover, the overall degradation rate changes with time and is close to a straight line, and there is no downward trend as the Ce3+ content increases. It can be guessed that if the Ce3+ content continues to increase, satisfactory photocatalytic effects will be achieved.