1980 results about "Photocatalytic reaction" patented technology

Apparatus and method for cleaning air. An air cleaner includes a housing that defines an airflow pathway and a catalytic reactor having a catalyst secured on a porous substrate that is disposed transverse to the airflow pathway. Preferably, the catalyst includes a light activated oxidizing photocatalyst or a thermally activated oxidizing catalyst. A photocatalytic reactor will include a light source directed at a light activated oxidizing photocatalyst, such as TiO₂ particles or a binary oxide particle species, which is disposed on the porous substrate. Most preferably, a metal catalyst is disposed on the photocatalyst particles at a concentration or loading between about 0.01 wt % and about 5 wt %. The air cleaner may further comprise an adsorption matrix upstream of the catalytic reactor, optionally in combination with a heater. A particulate filter and/or an electrostatic precipitator may also be disposed upstream of the adsorption matrix and the catalytic reactor.

The invention discloses a process for preparing a high efficiency nanometer Tio2 visible light catalyst codoped with metal and non metallic ion, belonging to the photocatalysis technology field. The invention adopts titanic acid ester as precursor, uses metal salt and non-metallic compound as dopant, in accordance with sol-gel method, prepares the nanometer TiO2-based photocatalyst with codoping, high efficiency and visible light catalytic activity, wherein the catalytic activity is greatly higher than that of single-doped TiO2-based catalyst. The invention is characterized by the following: 1. due to codoping of the metal and non metallic ion, discrete localized doping level is formed respectively on the lower part of the conduction band energy level and the upper part of the valence band energy level of the TiO2-based catalyst, thus increasing the absorption of visible light and greatly improving the catalytic activity; 2. the doping level can inhibit the recombination of photogenerated carrier, promote the probability of the photogenerated carrier entering into the photocatalytic reaction and efficiently degrade pollutant molecules.

A semiconductor photocatalyst responsive to visual light is composed of the particles of metallic oxide chosen from iron oxide, nickel oxide, cabolt oide, copper oxide, etc, the non-metal element chosen from N, C, S, B and P and semiconductor nanoparticles chosen frmo TiO2, SnO2, ZnO, CdS and WO3.

The invention relates to a process method for treating hardly-biodegradable organic wastewater, and the method comprises the following steps: mainly utilizing the combination of ultraviolet light, electrochemistry, ultrasonic waves and oxidation-reduction chemical reaction for treating the hardly-biodegradable organic wastewater, and treating the wastewater by three reaction units of an ultrasonic cavitation zone, an electrochemical reaction zone and an ultraviolet light catalytic reaction zone, thereby realizing the high-efficient multi-stage deep wastewater oxidation reaction which combines the ultrasonic wastewater treatment method, the ultrasonic light and the collaborative Fenton reagent oxidation wastewater treatment, as well as the electrochemistry and the collaborative Fenton reagent oxidation wastewater treatment, effectively treating a variety of types of hardly-biodegradable organic wastewater and leading the COD removal rate of the wastewater after the treatment to be more than 90%.

The invention belongs to the field of photocatalytic materials, in particular relates to a novel red light or infrared light catalytic material which comprises an up-conversion material and a semiconductor material. In the invention, a semiconductor photocatalytic material and a red light/infrared-ultraviolet up-conversion luminescent material are combined, and the up-conversion material is used for absorbing red light/infrared light and emitting ultraviolet light, thereby activating the semiconductor photocatalytic material and realizing the infrared light catalysis. By modifying and improving the semiconductor in the composite material, the photocatalytic activity of the material can be further improved. The invention expands the wavelength range of the excitationlight required by photocatalytic reaction, breaks the limit that the photocatalytic reaction can be activated only by ultraviolet light and shortwave visible light, improves the utilization ratio of sun light in the photocatalytic reaction, and can be widely applied to the photocatalytic degradation of organic pollutants in water by using red light, infrared light and sun light.

A method of separating, concentrating or purifying uniform carbon nanotubes with desired properties (diameter, chiral vector, etc) in a highly sensitive manner by the use of structure-sensitive properties peculiar to carbon nanotubes; and an apparatus therefor. There is provided a method of separating, concentrating, or purifying carbon nanotubes with the desired properties contained in a sample, comprising the steps pf (a) irradiating a sample containing carbon nanotubes with light; and (b) selecting carbon nanotubes with desired properties. In a preferred embodiment, the light irradiation of the step (a) can be carried out in the presence of a metal so as to cause specified carbon nanotubes to selectively induce a photocatalytic reaction, resulting in metal deposition. Further, in a preferred embodiment, a given magnetic filed can be applied in the steps (b) so as to attain accumulation or concentration or carbon nanotubes with metal deposited.

The invention relates to a preparation method of a noble metal modified titanium dioxide photocatalyst, which refers to a photo-catalytic oxidation-reduction coupling method realized in a photo-catalytic reactor: firstly, TiO2, noble-metal water soluble salt and organism are used for preparing a suspension which is then ultrasonically vibrated after the pH value is regulated to 1-12, put into a photo-catalytic reactor for reaction for 0.5h to 8h at 0 DEG C to 90 DEG C under the irradiation of an ultraviolet source with the power of 8W to 125W or a medium or high-voltage mercury lamp source with the power of 100W to 600W, and then separated, washed and dried to obtain the TiO2 photocatalyst modified by noble metal Ag, or Au, or Pt or Pd, wherein, the content of TiO2 is 90 percent to 99.99 percent, the content of the noble metal is 0.01 percent to 10 percent. The noble metal modified titanium dioxide photocatalyst has high photocatalytic degradation activity and strong surface hydrophobicity and the attached catabolites are easy to clean.

A method for providing a superhydrophobic surface on a structure, for example aircraft wings, propellers and/or rotors, is set forth. The method includes applying a coating of hydrofluoric acid over a titanium substrate. A voltage is then applied across the titanium substrate so that current flows through the titanium substrate. The current flowing through the titanium substrate causes the hydrofluoric acid to react with the titanium substrate to anodize the titanium substrate. The anodization causes a nanoporous titanium oxide layer to grow across the titanium substrate. The titanium oxide layer includes a plurality of nano-tube structures that, once the remaining hydrofluoric acid is washed away, provide a microscopically rough surface on the titanium substrate. A conformal coating of a hydrophobic compound is then desposited on the microscopically rough surface to create a superhydrophobic surface. Thus, a substantially self-cleaning superhydrophobic surface is created on the titanium substrate, whereby, when exposed to ultraviolet light, the titanium oxide layer has a photocatalytic reaction with oxygen to oxidize any organic contaminants that may gather on the superhydrophobic surface.

The invention discloses a method for flue gas combined desulfurizing and denitrifying. The pending flue gas enters into the photocatalytic reactor to transmute the NO in the flue gas into NO2 at the function of ultraviolet light and catalyst. The flue gas oxidated enters into double alkali reactor, where the SO2 in the flue gas is absorbed by alkali, the Na2SO3 in the resultant reacts with NO2 in the flue gas, and N2 is exhausted out after reduced from NO2. The NO in the flue gas is done photochemical catalytic oxidation using TiO2 in the invention process to oxidate the NO into NO2 rapidly and enhance the oxidation degree of the NOx in the flue gas. The Na2SO3 produced in the process of double alkali desulfurization is used as a reducing absorption liquid to realize wet desulfurization and denitration at the same time. The efficiency of desulfurization and denitration is high, the structure is simple, and operation is convenient and the occupation of land is small.

A photocatalytic reactor with a modular configuration, based on UV light sources and a catalyst, useful for purifying and disinfecting wastewater from confined aquaculture, using Advanced Oxidation Processes (AOP), wherein the catalyst is supported over glass sheets as fixed strips within the reactor, at an established distance from the UV light source, and wherein the wastewater is treated as “batches” being re-circulated and returned to the circuit. The wastewater is fed through the lower end of the reactor and submitted to a strong turbulence when passing through perforations or holes made on the supports forming the floors that separate the reaction chambers.

The present invention involves increasing the quantum efficiency in titania photocatalysts for photocatalytic (oxidation of acetaldehyde) and photosynthetic (photosplitting of water) reactions by integrating the titania photocatalyst with a polar mineral having surface electrical fields due to pyroelectric and piezoelectric effects, and by adjusting the nanostructure of the photocatalyst materials. The photocatalytic reactivity of titania powder is increased due to the effect of electric field present on the surface of polar mineral material on the photocatalytic effect of commercial titania with respect to photolysis of water. Additionally, the photocatalytic performance of pure phase rutile and anatase nanostructures with well defined morphologies was found to improved with respect to certain photocatalytic reactions in comparison with non-structured titania.

A filter material in which protrusions are formed on the surface of a fiber base material by combining the filter base material and particles for forming protrusions having at least a part covered by a photocatalyst or a material containing a photocatalyst is disclosed. A gas treatment apparatus in which a gas treatment filter made of a filter material in which a photocatalyst having a refractive index higher than that of a filter base material is carried on the surface of the filter base material is installed in atmosphere to be treated and ultraviolet rays introduced into the light guiding member are leaked from the photocatalyst, thereby treating gas by the photocatalytic reaction.

The invention relates to a titanium dioxide nanometer tube electrode in the technology field of fathering the environmental pollution and its preparation method as well as its application. Its features lie in: choose the pure titanium or titanium alloy as the substrate, carry out the electrochemical oxidation in the condition of hydrofluoric acid with its density between 0.01wt% and 0.5wt%, form a titanium dioxide nanometer tube with its diameter between 40nm and 100nm and its length between 20nm and 50nm on the substrate vertically and get the integrative titanium dioxide nanometer tube electrode. The preparation features lie in: choose the substrate as the anode after grinding, etching and drying and the platinum sheet as the cathode, control the distance between the two electrodes between 10mm and 50mm, put them into the reactor, power on the stabilized voltage power supply with it voltage between 15V and 25V, after 1-to-30-minute reaction calcine them at the temperature of 400deg.C to 600deg.C for 40nin to 80min, cool it in natural condition and get the titanium dioxide nanometer tube electrode. The titanium dioxide nanometer tube electrode can be applied to the photocatalysed degradation and photoelectroncatalysed degradation to the organic pollutants. It has larger surface area and simple preparation method.

The present invention relates to a system for treating contaminated ballast water, comprising water inlets and outlets, piping connected to said inlets and outlets, at least one treatment unit connected to said piping, which treatment unit comprises UV radiation means, and catalysts, capable of, during operation, create photo-catalytic reactions in ballast water flowing through said unit, filter means for said ballast water and valve means for controlling the flow through said piping, treatment unit and filter means, characterised in control unit capable of, controlling and monitoring of said system for ensuring that no untreated water leaves the system in an uncontrolled manner.

The present invention discloses an apparatus and method for disinfecting an object in a batch, continuous, or mixed mode. The apparatus according to the present invention comprises a bath to/from which water is flowed in/drained out; and at least one ultraviolet ray (UV) lamp unit assembly mounted in the bath, each UV lamp unit assembly including a plurality of UV lamp units. Each UV lamp unit comprises a quartz tube, a UV lamp mounted in the quartz tube and a photo-catalyst layer of titanium dioxide formed on an outer surface of the quartz tube to disinfect an object in the bath by the photo-catalytic reaction of titanium dioxide and UV. The apparatus of the present invention may comprise a conveyer device comprising a driving roller, driven rollers and a conveyer belt wound around the rollers, the conveyer device is divided into an inlet portion formed at a first outside of the bath, a conveying portion formed in water in the bath and a discharging portion formed at a second outside of the bath.

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.

The invention publishes a solar energy photochemical catalysis reactor which bases on the compound parabolic condenser. At least a compound parabolic condenser is fixed through the bearing on the cant of the equipment. The glisten surfaces of the each compound parabolic condenser connect with the adjustment screw rod, a tubular reactor installs on the center of the compound parabolic condenser, and each tubular reactor connects together through the PVC tube. Through the coupling of the parabolic condenser and the tubular reactor to realize the solar optical fiber effective accumulation and use, the photocatalyst powder and the peroxide solution recycling move in the reactor internal, the catalyst accepts the light and catalysis when passes through the tubular reactor. The invention has simple operation,and may carry on each kind of photochemical catalysis reaction directly using the sunlight, the quantity of the compound parabolic condenser and tubular reactor may fluctuates by the design requirements, therefore the equipment may apply in each kind of different active photocatalyst.

The present invention relates to a method for treating, recovering and reusing high-temperature dyeing waste water by utilizing combined application technique of microwave-UV-light photocaltalytic oxidation-electrochemical oxidation. Said method includes the following concrete steps: filtering waste water, photocatalytic reaction, microwave degradation, microwave excitation, adding oxidant and active carbon and making chemical reaction etc.

The invention discloses an efficient photochemical catalysis air purifier, which consists of a machine box, a filtering device, a fan and a photochemical reacting room. The photochemical reacting room includes a three-dimensional honey comb ceramic halftone which loads a photocatalyst of nano-composite TiO2 and an ultraviolet radiation light which irradiates towards the honey comb ceramic halftone. The photocatalyst is TiO2 adulterated with little iron, lanthanum or cerium hydronium, and the quantity of the added hydronium is 0. 005 percent to 0.5 percent of the total weight. The three-dimensional honeycomb ceramic net of a photocatalyst carrier is a honeycomb ceramic, which is provided with 100 to 600 holes per square inch. The polluted air follows a wind inlet fan to go through the filtering device which consists of a primary filtering net and an active carbon filtering net, and granular articles are removed and volatile organic matters with peculiar smell are absorbed; the gas after primary purifying goes into the photochemical reacting room which is provided with the ultraviolet radiation light, the photocatalyst of nano-composite TiO2 and the three-dimensional honey comb ceramic net, and under an effect of a strong oxidizer which is produced by the reaction of the ultraviolet radiation and the photocatalyst, various organic pollutants in the air can be effectively decomposed.

The invention discloses a method for cutting graphene by using titanium dioxide through photocatalysis. The method comprises the steps: 1) a graphene lamellar layer is prepared on a substrate; 2) a convex titanium dioxide nano structure layer is constructed on a quartz substrate to obtain titanium dioxide mask; 3) the titanium dioxide nano structure layer of the titanium dioxide mask is contacted with the graphene lamellar layer and irradiated by ultraviolet light, and the titanium dioxide mask has photocatalysis reaction under the irradiation of the ultraviolet light and can simultaneously cut the graphene to obtain patterned graphene. The method avoids the use of solution phase, has high efficiency and mild reaction condition, and is not limited by the substrate, thus being compatible with the existing semiconductor technique and laying foundation for the development of graphene surface flexible electronic devices.