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 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 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 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 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 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 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.