119results about How to "Improve photocatalytic reaction efficiency" patented technology

The invention provides a photocatalytic reaction method, comprising the steps of: atomizing a solution or suspension containing a photocatalyst and a reactant to form mist; and leading the mist to be subjected to photocatalytic reaction by utilizing a light source. The invention also provides a photocatalytic reaction device, which comprises a reaction vessel, an atomizer arranged inside or outside the reaction vessel, a condensation sleeve communicated with the reaction vessel, and the light source used for photocatalytic reaction. By means of the method and the device, a gas-liquid interface is enlarged by changing the form of water, i.e. atomizing the liquid-phase solution of the catalyst, so as to reduce the escape path of hydrogen gas and effectively inhibit the occurrence of reverse reaction, meanwhile, because the scattering probability of light in the mist is increased and the effective absorption is enhanced, the light utilization rate and the catalytic efficiency of the photocatalyst are greatly improved.

A composite nanoparticle as the magnetic core carried photocatalyst is composed of the magnetic Fe3O4 nanoparticle as core, SiO2 coated on the surface of said core, and TiO2 carried by said SiO2/FeO4 particle, and is prepared by chemical codepositing method. A method for using said photocatalyst to clean sewage features that the organic pollutants in sewage is deeply oxidized by it to generate CO2 and H2O. Its photocatalyzing apparatus is composed of high-pressure Hg lamp, quartz sleeve tube, bias electrode, condensing water inlet and outlet, gas distributing plate, said photocatalyst, ring reaction chamber, organic class container, sampling opening and aerating unit.

The invention relates to a combined apparatus for advanced treatment of high concentration organic waste water. The apparatus comprises a pretreatment buffer tank, an anaerobic reactor, a pressurized aeration stirring system, a photocatalytic reactor, a filter chamber, a backwashing system, a back flow line pipe system and the like. Preliminary treatment of high concentration organic waste water is carried out by using an anaerobic method after waste water is pretreated, then advanced treatment of primary treated water is carried out by using a photocatalysis method, and furthermore, effluentis filtered with the filter chamber. The apparatus provided in the invention can both profoundly remove high concentration organic matters and ferro-manganese ions in waste water and prevent secondary pollution, has the advantages of small energy consumption, high efficiency, a good effect and the like, is applicable to treatment of high concentration organic waste water and can guarantee stable and highly efficient water yielding and the quality of reused water.

The invention discloses an air flue type photocatalysis air purifier which comprises a shell. At least one photocatalysis structure is arranged inside the shell, and photocatalysis filter screens and an ultraviolet source are arranged in the photocatalysis structure. The air flue type photocatalysis air purifier is characterized in that, in the photocatalysis structure, the number of the photocatalysis filter screens is two, and the whole photocatalysis filter screens are in a back-and-forth zigzag W shape, a fin is arranged between the two photocatalysis filter screens, the fin is in a W shape in the length direction and is transversely connected to the interior of the shell, the width direction of the rib is coincident with the longitudinal direction of the shell, a transparent sleeve arranged in the transverse direction of the shell is installed in the middle of the fin in a penetrated mode, and the ultraviolet source is arranged in the transparent sleeve. The photocatalysis filter screens, the fin and the inner surface of the shell are all coated with photocatalysts. The air flue type photocatalysis air purifier can be installed in an air flue, and extra occupied space is not needed; meanwhile, the effective reaction area of the air flue type photocatalysis air purifier is large, the using efficiency of the ultraviolet source is high, the reaction-mass transferring capacity of the surface of the photocatalysts is high, energy consumption is small, the structure is simple, the reaction efficiency is high, and the air flue type photocatalysis air purifier is convenient to use and install.

The invention discloses a composite photocatalyst for promoting water photolysis for producing hydrogen. The CdS/NiTiO3 composite photocatalyst is prepared through condensation-reflux introduction of a perovskite material NiTiO3 to CdS, wherein the NiTiO3 is synthesized through a sol-gel technology and is used as a cocatalyst. The composite catalyst promotes transfer of photon-generated carriers through a heterostructure formed by CdS and NiTiO3 and reduces the compounding probability of photon-generated electrons and holes, so the efficiency of water photolysis for producing hydrogen is substantially improved, and the disadvantage of photocorrosion of traditional photocatalysts is alleviated. The composite photocatalyst has the advantages of simple and easy preparation method, mild reaction conditions, and wide application prospect in the fields of development of energy alternatives of fossil fuels and high-efficiency utilization of the solar energy.

The invention discloses a surface oxygen vacancy-modified bismuth oxybromide photocatalyst and a preparation method thereof. The invention relates to the technical field of photocatalysis. According to the invention, a bismuth oxybromide material is prepared through a chemical precipitation method, and the bismuth oxybromide material comprises BiOBr or Bi24O31Br10. Then, bismuth oxybromide powderis dispersed in a methanol-water solution, and nitrogen aeration treatment and visible light illumination are carried out, so that to the surface oxygen vacancy-modified bismuth oxybromide photocatalyst is obtained. The preparation method of the oxygen vacancy-modified bismuth oxybromide photocatalyst is simple, is easy to operate, and is high in repeatability and low in cost, and the absorption rate of visible light can be remarkably improved.

The invention relates to a rotary-type photocatalysed or adsorptive reactor, comprising a sink, a rotating wheel, a water inlet and a water outlet and a light source. The reactor is characterized in that the sink is oblique; the rotating wheel is mounted on the sink horizontally, connected with two sides of the sink via a central axis and provided with a neck; a sheet is mounted on the neck, and both sides of the neck are loaded with catalyst, film or absorbing agent; parts of the rotating wheel breaks the surface of the water, and the sheet on the rotating wheel is shocked by stream to promote the rotating wheel to slowly rotate; sunlight or ultraviolet lamp can be taken as light source; or the rotating wheel can be connected with bearings on both sides of the sink via the central axis and connected with a reducing motor. The reactor can greatly increase the contact area among catalyst light sources and pollutants, enlarging photopermeability by using glass sheets, and prolonging reaction time. The reactor features simple and compact structure, little energy consumption, high clearance, low processing cost, moderate processing condition, and easy realization of industrialization.

The invention provides a preparation method of a semitransparent honeycomb ceramic having a visible light catalysis function. A photocatalyst film is supported on a semitransparent honeycomb ceramic carrier, and the step includes the two preparation steps of preparing the semitransparent honeycomb ceramic carrier and supporting the photocatalyst film: firstly, a visible light semitransparent aluminum oxide honeycomb ceramic carrier is prepared, then a sol-gel method is adopted to support rare earth and nitrogen co-doped TiO2 sol on the carrier, and the nanoscale-thickness uniform and transparent photocatalyst film is formed through sintering. The catalyst film of the semitransparent honeycomb ceramic carrier can respond to visible light to play a catalysis effect, and the carrier also has semi-transparency to the visible light so that the visible light can be effectively utilized and the photocatalytic efficiency can be improved. Accordingly, a practical material is provided for achievement of solar photocatalysis treatment to pollution.

The invention relates to a piezoelectric-photocatalyst for enhancing photocatalytic degradation reaction, a preparation method and an application thereof. The material is prepared through three stepsof preparing lead zirconate titanate powder as a piezoelectric material, preparing a titanium oxide nano-wrapped particle precursor and using photocatalyst titanium oxide nano-particle for coating thelead zirconate titanate powder. The piezoelectric-photocatalyst is applied to a liquid phase catalytic degradation reaction system of rhodamine B dye, bisphenol A, parachlorophenol and phenol under the conditions of ultraviolet light power density of 1-20mW.cm-2 and magnetic stirring revolving rate of 200-1200rpm. Compared with the prior art, the invention has the advantages that only liquid mechanical energy is required for inducing a proper piezoelectric field, other element doped or heterogeneous structure is not required, and the photocatalytic reaction effect is obviously promoted. The compound catalyst with a core-shell structure has stable mechanical properties and chemical properties, is capable of treating environment while has no side effect to environment.

The invention relates to a method for processing wastewater by using a photocatalytic reaction. According to the method, the photocatalytic reaction is carried out by using immobilized TiO2 or transition metal-doped TiO2 as a catalyst and the wastewater as a reaction medium, wherein the TiO2 is anatase TiO2; the transition metal is a rare earth element; a loading amount of the immobilized TiO2 or transition metal-doped TiO2 is 0.82%-1.24% (by weight); and the usage amount of the immobilized TiO2 or transition metal-doped TiO2 is 5-12 g in 1 L of the wastewater. A reaction light source of the photocatalytic reaction is a visible light source or an ultraviolet light source. The invention also relates to a photocatalytic reactor capable of realizing the above method. With the method provided by the invention, the photocatalytic reaction catalyzed by TiO2 can be carried out under the visible light and has high reaction rate.

The invention discloses an in-situ preparation method of flexible piezoelectric photocatalysis nanofibers. The in-situ preparation method is specifically implemented according to the following steps of carrying out electrostatic spinning and calcining to obtain flexible inorganic fibers with smooth surfaces and small grain sizes, drying the surfaces of the fibers under the action of a surfactant to form uniform island-shaped structures, and finally obtaining the composite flexible piezoelectric photocatalysis fibers with island-shaped piezoelectric plates on the surface of an intermediate photocatalyst by utilizing in-situ growth. The flexible inorganic piezoelectric photocatalysis nanofibers with good mechanical property and stability are obtained, have stronger durability and more cycle times under the action of a subsequent external load, and have wide application prospects in the fields of sewage treatment, air purification, antibiosis and disinfection, hydrogen production by photodecomposition of water and the like.

Graphene formaldehyde-removing floor wax is provided. The floor wax mainly includes liquid wax, solid wax, an emulsifier, an anti-skid agent, a stabilizer, a brightener, deionized water, essence, an anti-formaldehyde auxiliary agent and a sterilizing agent. The anti-formaldehyde auxiliary agent is a mixture of graphene and nanometer titanium dioxide. Compared with common floor wax, the graphene formaldehyde-removing floor wax is free of formaldehyde, benzene and other organic pollutants, can seal organic volatile matters in floor, and can remove formaldehyde. In addition, through addition of the graphene, the decomposition and cleaning efficiency of harmful compounds and wear-resistant and antiskid properties of coatings can be increased.

The invention relates to an antibacterial coating for removing formaldehyde in combination with physical adsorption and chemical catalysis and a preparation method of the coating. The antibacterial coating is prepared from raw materials in parts by weight as follows: 5-10 parts of an anti-formaldehyde aid, 1-5 parts of nano-silver colloid, 20-25 parts of polyurethane-modified acrylic resin, 0.2-0.5 parts of a thickening agent, 0.2-0.5 parts of a defoaming agent, 6-9 parts of titanium dioxide slurry, 0.8-1.4 parts of a wetting agent and 10-20 parts of water, wherein the anti-formaldehyde aid contains graphene, nano titanium dioxide and diatomite. Formaldehyde is removed in combination with physical adsorption performance of diatomite and chemical catalysis performance of nano titanium dioxide, and the decomposition efficiency for formaldehyde is greatly improved.

The invention relates to a method for producing a visible-light responsive nanotube catalyst with binary synergistic effect for photocatalytic water splitting. The method includes the following steps: thoroughly mixing butyl titanate or TiCl4, anhydrous alcohol and an acid to obtain a solution, thoroughly mixing FeCl3, Fe(NO3)3, Eu(NO3)3 or Ce(NO3)3, deionized water, an acid and anhydrous alcohol to obtain a solution, mixing the two solutions to form a sol, drying the sol, calcining to obtain powders, adding the powders into the NaOH solution, placing in a sealed reaction vessel while controlling the reaction temperature, neutralizing and washing to obtain a single doped nanotube, calcining the single doped nanotube in the presence of nitrogen gas, to obtain a co-doped nanotube photocatalyst. Compared with the prior art, the inventive co-doped nanotube photocatalyst has the advantages of large specific surface area, good photoresponsive property and high photocatalytic efficiency.

The invention discloses a method for sterilizing sewage by hydrogen peroxide-titanium dioxide photocatalysis and adopts the titanium dioxide photocatalysis and hydrogen peroxide to treat the sewage. The invention adds H2O2 to a TiO2UV system to form a H2O2-supported TiO2 photocatalysis system; the reaction of the hydrogen peroxide and the negatively charged electron consumes the electron in the reaction, thus reducing the chance of compound with cavities and remarkably improving the photocatalysis reaction efficiency. The proposal of the invention remarkably reduces the investment and operation cost of the ultra violet sterilization of the sewage, overcomes the defects of instability of UV sterilization technical effect and photoreactivation of microorganisms, develops the application of the UV sterilization technique in the sewage treatment and strengthens the decomposition of non-degradable organic pollutant, thus being a promising sewage treatment method.

The present invention relates to sewage treatment equipment. The industrial wastewater photocatalysis reaction treatment system comprises a bubbling pool, an air agitating pump, a magnetic separation device and a sewage pump, wherein the bubbling pool is provided with a plurality of water tanks having an overflow port, the overflow ports of the adjacent water tanks are staggered, air agitating branch pipes connected with the air agitating pump are arranged in the water tanks, the magnetic separation device comprises a water chamber and a magnet for making a magnetic field be generated in the water chamber, the water chamber is provided with a water chamber inlet, a water chamber outlet and a catalyst outlet, the outlet end of the sewage pump is communicated with the first water tank in the water tanks, the catalyst outlet is connected with the inlet of the sewage pump, the water chamber inlet is connected with the overflow port in the last water tank of the water tanks, and a light transmission ceiling is covered above the bubbling pool and is provided with an ultraviolet ray lamp. With the system of the present invention, the photocatalyst can be recycled, and the problems of sewage treatment, high energy consumption and incapability of photocatalyst recovery are solved.

The invention discloses a preparation method for opacifying additives of mineral-compound nano titanium dioxide ceramic glazes. Firstly, by using tetrabutyl titanate as a precursor, the sol-gel method is adopted to prepare a nano titanium dioxide/white diatomite photocatalyzed compound material; nano titanium dioxide, carboxymethyl cellulose and the like are added into the nano titanium dioxide-white diatomite compound through ultrasonic dispersion to obtain the additives in an emulsion state, and the obtained additives are added into the ceramic glazees and coated on the surface of the ceramic body through high-temperature calcining; during high-temperature calcining, nano calcium carbonate is wrapped by the nano titanium dioxide-white diatomite compound. The binding reaction between nano calcium carbonate and the nano titanium dioxide particles at the phase interface is achieved through hydroxy groups on the surfaces of nano calcium carbonate and the nano titanium dioxide particles, thereby guaranteeing stable binding of nano calcium carbonate and the nano titanium dioxide particles, and obtaining smooth and fine glazes which are not likely to become yellow and has good whiteness after calcining.

An integrated photovoltaic power generation and photocatalytic water purification solar energy utilization system comprises a solar photovoltaic panel, a photocatalytic reactor, a wastewater circulator, and a gas circulator, wherein a back plate of the solar photovoltaic panel is bonded to a high-heat-conductivity cover plate of the photocatalytic reactor through heat transfer glue, a plurality of ultraviolet lights are distributed on the outer surface of the photocatalytic reactor, the wastewater circulator comprises a wastewater tank, a water pipe and a gas-liquid separator, the wastewater tank is arranged above the photocatalytic reactor, the gas circulator comprises a one-way valve, a cooler, a gas storage tank, a valve, a gas pump, an adjusting valve and a gas flowmeter which are connected in sequence through a gas pipeline, gas is cooled by the cooler and then introduced into the photocatalytic reactor through the gas pump, the cooled gas is in direct contact with wastewater for heat exchanging so that the solar photovoltaic panel is cooled, and power is provided for circulation of the wastewater; therefore, the solar photovoltaic panel generates power efficiently at low temperature, efficient photovoltaic water purification may also be performed, and solar energy utilization efficiency is improved.

The invention discloses a wastewater treatment apparatus utilizing photocatalysis to degrade organic pollutants. The apparatus comprises a barrel, the lower part of the barrel is provided with a water inlet, the upper part of the barrel is provided with a water outlet, a support plate is arranged in the barrel, multiple base plates are arranged between the top of the barrel and the support plate, each base plate is provided with a UV source and is covered by a photocatalyst film, and a magnetic adsorption device and a magnetic photocatalyst are arranged between the support plate and the bottom of the barrel. The provided wastewater treatment apparatus overcomes the shortages that in the prior art, a photocatalyst is easily deactivated, gets agglomerated easily, and is hard to recover. The apparatus has the advantages that the photocatalytic reactions are carried out more fully, the photocatalyst agglomeration is avoided, and the photocatalyst is easy to recover.