80 results about "Photo assisted" patented technology

The invention relates to a treatment method for small water quantity refractory wastewater deep purifying and utilizing. The method comprises the following steps: step one, pre-filtrating wastewater is performed firstly; step two, the pH value of the wastewater is adjusted to 3-5 to ensure the wastewater to present subacidity; step three, the wastewater flows into a spout-fluid bed reaction tower, the wastewater is processed through a micro-electrolysis method, and micro-electrolysis composite functional material is utilized in the micro-electrolysis method; step four, the wastewater is processed through a photo-assisted fenton catalytic oxidation method; step five, the pH value of the wastewater is adjusted to 6.8-7.8, and then the wastewater is processed through strengthen flocculation method; step six, the wastewater flows to a microwave catalysis reactor, and is processed through a microwave catalytic oxidation method; step seven, the wastewater flows into a UV photochemical reactor, and is processed through the UV photocatalysis; step eight, the wastewater flows into a gravitation filter, and the wastewater can be clarified to meet the requirement of the reuse water quality. The invention also provides equipment for performing the treatment method.

The invention relates to an organic wastewater treatment film reactor utilizing solar energy photo-assisted electro-catalysis, which comprises a storage tank of water to be processed, a flow controllable constant flow pump, a photoelectric chemical reactor, a clear water storage tank and a solar battery component, wherein a photo anode and a cathode are correspondingly arranged in the reactor; the photo anode takes a porous metal membrane as a base body, and a TiO2 nano tube or a TiO2 mesoporous membrane is formed on the surface of a porous titanium membrane (net) by an electrochemical anisotropic etching technology; a porous channel film is used as the base body; a metal oxide coating electrode with high electrochemical catalytic activity and high electrical conductivity is prepared by a dipping film-forming method, simultaneously, by doping and modifying operations, the electrode material has photo catalytic activity and the reaction efficiency is improved. The reactor integrates electrochemistry, photocatalysis and film separation technologies; the three technologies are coupled to enhance a synergistic effect; the wastewater treatment efficiency can be improved; a solar component is adopted as a power supply; the clean solar energy is utilized to the maximal degree, and the organic wastewater treatment film reactor has social benefits of reducing environment load and economic benefits of reducing cost.

The invention discloses a method for degrading organic waste water by photo-assisted activation of potassium hydrogen persulfate through bismuth ferrite, belonging to the technical field of waste water treatment. A perovskite structure BiFeO3 in the invention has a spherical morphology and is prepared by adding a certain amount of a surface active agent under hydrothermal conditions; the specific surface area is high; and the prepared BiFeO3 self can degrade organic pollutants by photocatalysis under the irradiation of visible light. According to the method disclosed by the invention, BiFeO3 is applied to degrading the organic pollutants by activating potassium hydrogen persulfate; the methyl orange degradation rate within 15 min is 94%; the methyl blue degradation rate within 40 min is 90%; the rhodamine degradation rate within 40 min is 65%; by means of combined use of BiFeO3 and potassium hydrogen persulfate, the organic pollutants are oxidized and degraded; the organic pollutants can be effectively degraded under better illumination conditions; the organic pollutants can also be effectively oxidized and degraded without light or under poor illumination conditions; and therefore, the method has good application prospect.

A method for oxidizing an inorganic species in an aqueous solution comprises the steps of: (i) supplying an oxidizable source of sulphur, and oxygen to the solution; and (ii) irradiating the solution with UV light such that both the inorganic and sulphur species are oxidized.

A method of forming a gate insulator in the manufacture of a semiconductor device comprises conducting a photo-assisted electrochemical process to form a gate-insulating layer on a gallium nitride layer of the semiconductor device, wherein the gate-insulating layer includes gallium oxynitride and gallium oxide, and performing a rapid thermal annealing process. The photo-assisted electrochemical process uses an electrolyte bath including buffered CH3COOH at a pH between about 5.5 and 7.5. The rapid thermal annealing process is conducted in O2 environment at a temperature between about 500° C. and 800° C.

The invention relates to a preparation method for a WO3-LDH (Layered double hydroxide) composite film for photoelectrocatalytic water decomposition. The preparation method comprises the following steps of: dissolving ammonium tungstate and concentrated hydrochloric acid into water to obtain a solution, stirring the solution and transferring the solution into a lining of a high-pressure reaction kettle, and inserting pre-treated conductive glass FTO; then, carrying out solvothermal reaction, naturally cooling the room temperature, washing and drying the conductive glass, and carrying out thermal treatment for at least one hour at a temperature being 450-500 DEG C under air atmosphere, thereby obtaining a WO3 film; and the WO3 film as a working electrode, taking an aqueous solution of nickel nitrate and iron nitrate as electrolyte, depositing NiFe-LDH on the surface of the WO3 film under constant current, finally obtaining the WO3-LDH composite film. The product prepared by the preparation method has high photoelectric conversion efficient, low photooxidation water take-off potential, and has a wide application prospect in the fields such as photocatalytic degradation, photoelectrocatalytic water decomposition, artificial photosynthesis and photo-assisted energy storage batteries.

The invention relates to an air-breathing photo-assisted biomass fuel cell. The fuel cell can transform optical energy and biomass energy into electric energy through optical excitation. The fuel cell comprises a light window, a liquid storage chamber, sealing washers, an anode fixed plate, an anode diffusion layer, a membrane electrode, a cathode gas diffusion layer, a cathode collector plate and an end plate. The inner sides of the anode fixed plate and the cathode collector plate are respectively provided with the sealing washers. The membrane electrode is arranged between the two sealing washers. The membrane electrode located at one side of the cathode collector plate is provided with the cathode gas diffusion layer. The membrane electrode located at one side of the anode fixed plate is provided with the anode diffusion layer. The outer side of the cathode collector plate is provided with the end plate. The outer side of the anode fixed plate is provided with the liquid storage chamber. The sealing washer is arranged between the liquid storage chamber and the anode fixed plate. The light window is laid in the hollow part of the middle of the front side of the liquid storage chamber. The light window is used as a light entrance port. A photo anode and a fuel solution are arranged in the liquid storage chamber. The fuel cell provides a cheap and eco-friendly novel approach of conversion of solar energy and biomass energy into electric energy.

The invention discloses a method for etching class-III nitride by using a photo-assisted oxidation wet method, which is characterized by comprising the following steps: step 1, preparing an ultraviolet light masking layer with patterns on the surface of the class-III nitride by using a standard photo-etching process; step 2, placing the class-III nitride of which the surface is provided with the ultraviolet light masking layer with the patterns under high-energy ultraviolet light to be exposed so as to oxidize the exposed class-III nitride with the patterns under the assistance of the ultraviolet light to generate a metal oxide; step 3, removing the masking layer; and step 4, putting a sample of the exposed class-III nitride in acid or alkali solution so that the generated metal oxide is fully eroded to form an etching step with the patterns to finish the process for etching the class-III nitride by the wet method.

A photographic method of a stereoscopic image or an omnidirectional image has hidden potential of creating innovative video systems and video services that have never existed before. A photo assistant tool includes: a rotator formed by a ring-shaped circular member; a first imaging section and a second imaging section provided on an upper face of the rotator; and a support base. The first imaging section and the second imaging section take a pair of parallax images. At the same time, by continuous shots taken by the first imaging section and the second imaging section while the rotator is being rotated about a center as a center of rotation, omnidirectional parallax images are obtained. Furthermore, by continuous shots taken by the first imaging section and the second imaging section while the rotator is being continuously rotated, a motion picture made up of omnidirectional parallax images as frames is taken.

An apparatus for photo-assisted or photo-induced processes is disclosed, comprising a process chamber having an integrated gas and radiation distribution plate. In one embodiment, the plate has one set of apertures for distributing one or more process gases, and another set of apertures for distributing radiation to a process region in the chamber.

The present invention discloses a CuWO4 / WO3 composite photo-assisted gas sensor and a preparation method thereof. The method is as below: conducting a hydrothermal reaction on a gold interdigital electrode sheet surface to generate a H2WO4 film, then immersing the electrode sheet in an alcohol solution of copper acetate to generate in-situ mosaic CuWO4 on the surface; and then conducting high temperature calcination to prepare the photo-assisted gas sensor with CuWO4 / WO3 heterojunction structure. The present invention can effectively simplify the preparation process of gas sensor; and the obtained photo-assisted gas sensor has good stability and repeatability, and shows good response performance to CO gas at room temperature and under visible light. The invention has good application prospects in preparing a semiconductor photo-assisted gas sensor and expands the selection range of materials for WO3-based photo-assisted gas sensor.

The invention relates to a method for deeply treating aromatic nitro-compound wastewater through photo-assisted catalysis and belongs to the technical field of catalytic oxidation wastewater treatment. The method comprises the following steps: (1) adjusting a potential of hydrogen (pH) value of the wastewater to be in a range of 1.5-5.5, (2) adding a compound containing ferrous iron ions or ferric iron ions, wherein the adding amount of the iron ions is 5-75 mg / L, (3) adding an oxidizing agent to perform catalytic oxidation reaction at the temperature of 5-65 DEG C for 10-30 minutes, (4) using ultraviolet light with dominant wavelength of 252.7nm to perform irradiation for 5-30 minutes, and (5) continuing to perform the catalytic oxidation reaction at the temperature of 5-65 DEG C, wherein the adding mount of the oxidizing agent is 0-50% of total oxidizing agent amount. By applying a small amount of iron-ionic catalyst and with the assist of ultraviolet light irradiation, oxidation treatment of the low-concentration aromatic nitro-compound wastewater is efficiently performed, the time required by reaction for reducing chemical oxygen demand (COD) and removing a toxicant aromatic nitro-compound is shortened, and biochemical treatment is easily performed.

The invention discloses a self-powered sensor used for detecting microcystic toxins. The sensor comprises a photoanode, a photocathode, a simulated-solar-light source, an electrolyte solution, a quartz reaction pool, an air vent and a microcystic-toxin standard concentration solution; The photoanode and the photocathode are inserted into the quartz reaction pool containing the electrolyte solution, and are in communication through an external circuit. The photocathode is close to the air vent. The light source simultaneously illuminates the photoanode and the photocathode. The sensor is characterized in that the electrolyte solution is a phosphate buffer solution with pH=4-6, and a constructed dual-photoelectrode-driven photo-assisted fuel cell system forms a current pathway under drivingof self-bias voltage generated by the photoanode and the photocathode under a light illumination condition, and generates electrical energy. According to the sensor of the invention, use of externallyadded power sources is avoided; and dual-photoelectrode-driven photo-assisted fuel cell technology is used for constructing a self-powered sensing platform, an energy utilization efficiency ratio isimproved, and manufacturing costs of the self-powered sensor are also reduced.

The invention discloses a photo-assisted microorganism fuel battery which comprises a photo-responded semiconductor photo-assisted cathode (6), a cathode chamber (4) of the photo-responded semiconductor photo-assisted cathode (6), a three-dimensional overall nitrogen-doped graphene self-supported foamed anode (5), microorganisms (1) of the three-dimensional overall nitrogen-doped graphene self-supported foamed anode (5), an anode chamber (2), a proton exchange membrane 3 and a load (7), wherein organic matters which can be oxidized and microorganisms (1) are placed inside the anode chamber (2); the three-dimensional overall nitrogen-doped graphene self-supported foamed anode (5) and the photo-responded semiconductor photo-assisted cathode (6) are respectively placed in the anode chamber (2) and the cathode chamber (4); the load (7) is serially connected between an outer anode and a cathode of a battery slot, so that a three-dimensional nitrogen doped graphene anode assisted photo-assisted microorganism fuel battery system can be formed. A P-type semiconductor photo-assisted cathode with visible light response is adopted to establish a novel photo-assisted microorganism fuel battery system. Simultaneous utilization of biomass energy and solar energy can be achieved, and the energy utilization efficiency and the power output density can be remarkably improved.

The invention discloses a preparing method for a cobalt-phosphide-modified molybdenum-doped bismuth vanadate photoelectrode. The preparing method includes the steps that a bismuth oxyiodide photoelectrode is made on the surface of conducting glass with the sedimentation method, a vanadium source solution and a molybdenum source solution are dropwise added onto the bismuth oxyiodide photoelectrode,annealing cleaning is carried out, and then molybdenum-doped bismuth vanadate photoelectrode is obtained; cobalt phosphide is subjected to electrodeposition on the surface of the molybdenum-doped bismuth vanadate photoelectrode through photo assisting in a three-electrode system, and the novel bismuth vanadate photoelectrode is obtained. The invention also discloses application of the composite molybdenum bismuth vanadate photoelectrode to photoelectrocatalysis decomposition of water. The photoelectrode prepared with the method is used for producing hydrogen through photoelectrocatalysis decomposition of water, and through molybdenum doping, the concentration of charge carriers can be effectively increased, and photocurrent is increased; through cobalt-phosphide electrodeposition, composite loss in the photoelectrode can be effectively delayed, the service life of photon-generated carriers is prolonged, an oxygen evolution reaction on the surface of the photoelectrode is promoted, andtherefore the solar energy photo-hydrogen conversion efficiency of the semiconductor photoelectrode is improved.

The invention belongs to the technical field of non-metal ores, and particularly relates to a preparation method and application of an attapulgite / molybdenum sulfide composite material. The preparation method comprises the following steps: adding a molybdenum source, a sulfur source and attapulgite into deionized water, sufficiently dispersing to obtain a dispersion solution, carrying out hydrothermal reaction on the dispersion solution, filtering, washing the filter cake, and drying to obtain the attapulgite / molybdenum sulfide composite material. The composite material can be used as a catalyst to perform photo-assisted SCR (selective catalytic reduction) denitrification.

The invention relates to a method for preparing a low-stress GaN film. A GaN / sapphire composite substrate is corroded with a photo-assisted corrosion solvent so as to form the GaN / sapphire composite substrate in a nano-structure; the photo-assisted corrosion is the ultraviolet-assisted corrosion, the corrosion solvent is the mixed solution of strong base and oxidant, namely, the mixture in a molar concentration of 0.05-0.15 M consisting of NaOH or KOH in a molar concentration of 0.5-1.5 M and K2S2O8, and the reaction is carried out at a room temperature or a temperature below 50 DEG C for 0.5-10 hours; and the GaN / sapphire composite substrate in the nano-structure can be obtained. The method is used for reducing the stress in the GaN film material of the semiconductor material grown with the HVPE (hydride vapor phase epitaxy).

The invention relates to a photo-assisted chargeable lithium ion secondary battery, belonging to a cross domain of a photo-electro-chemical solar battery and a lithium ion secondary battery. The battery consists of an anode, a diaphragm, a cathode, an electrolyte solution and a lead wire. The diaphragm is located between the anode and the cathode; an external circuit between the anode and the cathode is communicated by using the lead wire; and an internal circuit is communicated by using the electrolyte solution to form a closing loop; the anode is a photo-permeability anode used by the photo-electro-chemical solar battery; the cathode is a cathode used by the lithium ion secondary battery; the diaphragm is an oxidation-resistant diaphragm capable of transmitting lithium ions and iodide ions and not transmitting iodide molecules, and the diaphragm is used by the lithium ion secondary battery; and the electrolyte solution is an organic electrolyte solution used by a lithium ion secondary battery containing Lil and / or LiBr. The battery has great stored energy capacity and solves a self-discharging phenomenon. The stored chemical energy can stably exit. Meanwhile, the charging electric energy consumption can be saved by using low voltage to charge under illumination. The photo-assisted chargeable lithium ion secondary battery provided by the invention has the advantages of low cost, simple equipment and good repeatability.

The invention discloses an AlGaN-based uv-LED device on a SiC substrate and a manufacturing method, relating to the technical field of micro-electronics and mainly solving the problem of low light-emitting efficiency. The device comprises a low-temperature AlN nucleating layer, a high-temperature AlN nucleating layer, an intrinsic AlGaN epitaxial layer, an n-AlGaN barrier layer, an active area, a p-AlGaN barrier layer, a low Al component p-shaped AlGaN layer, a p-shaped GaN capping layer and a window area arranged on the p-shaped GaN capping layer from bottom to top in sequence. The device etches the p-GaN capping layer to the low Al component p-AlGaN layer by a dry method to form a cylindrical emergent light window, and then the cylindrical emergent light window is etched by a photo-assisted wet method to be changed into a hemispheric-like window, so that the emergent aperture of the window is enlarged, the power and efficiency of the emergent light are improved and the window is especially suitable for manufacturing large-power uv-LED. The device has simple process, good repeatability and high reliability and can be used for water processing, medical treatment, biomedicine occasion and white light illumination.

The invention discloses a preparation method for producing a hydrogen electrode through efficient photoelectrocatalysis and an application thereof. According to the method, three-dimensional silicon nano pillars are used as a substrate, and the photo assisted-electrochemical deposition method is used for preparing a core-shell p-Si / NiCoSex nano pillar photocathode. Unformed NiCoSex shows excellent electrochemical catalysis hydrogen production performance (the Tafel value is about 39 mV / decade) and good transmission of light. The p-Si / NiCoSex nano pillar array photocathode prepared through the method enhances absorption of visible light and generation and utilization of a photon-generated carrier to a great extent. Under the condition of 100mW / cm<2> simulated sunlight, the light current density under the condition of 0 V(vs.RHE) is -37.5 mA / cm<2> which is the currently-reported highest value of the photocathode using p-Si as the substrate. The synthetic method is simple and efficient, environmentally friendly and capable of being popularized to synthesis of other transition metal chalcogenides, thereby being of broad scientific significance.

The invention discloses a device and method for achieving photo-assisted electrochemical catalytic oxidation of oil fumes. The device comprises a spray tower shell and an electrolyte circulating system; a fume inlet is formed in the bottom of the spray tower shell, a fume outlet is formed in the top of the spray tower shell, and an ultraviolet lamp and a quartz tube are fixed in the spray tower shell; the electrolyte circulating system comprises an electrolysis reactor, a circulating pump, a material supplementary box and a plurality of spray heads, the electrolysis reactor comprises a positive electrode plate and a negative electrode plate, and a power supply system is connected to the electrolysis reactor and supplies power to the electrolysis reactor; the spray heads are arranged on the top inside the spray tower shell and connected with the electrolysis reactor through a pipeline; the circulating pump is arranged on the pipeline for connecting the electrolysis reactor with the spray heads; the material supplementary box is provided with a feed port and used for supplementing a raw material sodium chloride, and an outlet of the material supplementary box is connected with a pipeline for connecting the electrolysis reactor and the circulating pump. The device has the advantages of being simple in structure, cheap in raw material, low in energy consumption, long in material replacement cycle, free of pollution to the environment and the like.

The invention, which belongs to the LED technology field, relates to a coarsening method of a wet method of a gallium phosphide window layer of a photo-assisted red light LED. A mixed solution of hydrofluoric acid and an oxidizing agent is utilized and light irradiation is utilized; a gallium phosphide window layer can be corroded without a mask layer and a conical composition array is obtained, so that a surface coarsening of the red light LED is realized. A size and a height of the conical composition caused by corrosion can be controlled by controlling corrosion time and a concentration ofcorrosive liquid. According to the invention, a problem of coarsening of the gallium phosphide window layer of the red light LED can be effectively solved and an extraction efficiency of a red light LED chip can be improved more than double. The method has advantages of good coarsening effect, low cost and rapid speed and the like and thus has great application potential in production of a large power red light LED.

The invention relates to a wastewater treatment process of a dimethoate pesticide, in particular to a wastewater treatment method of the dimethoate pesticide, and belongs to the technical field of chemistry. Wastewater of the dimethoate pesticide is subjected to photo-assisted Fenton oxidation treatment for 15 to 120 minutes (min), effluent is diluted to reach twofold volume after a reaction is finished, and the diluted effluent is subjected to biological treatment for 5 to 8 hours (h) through a cyclic activated sludge process (a CAST process for short); the wastewater of the dimethoate pesticide is only subjected to Fenton process pretreatment and the CAST process, so the wastewater treatment process is superior to a method which is used for treating the wastewater by combining three processes of photo-assisted Fenton, flocculation and micro-biological degradation and is reported in an invention publication (CN1636983A); the optimum time required by a Fenton pre-reaction process does not exceed 0.5 hour, and compared with that of the conventional method, the pretreatment time is shortened greatly and is superior to time required by various pretreatment processes in a document, namely 'the summarization of a pretreatment method of organophosphorus pesticide wastewater'; and the final CODcr removal rate of the wastewater of the dimethoate pesticide can reach 95 percent.

The invention discloses a photo-assisted heating system for a multi-plate hydride vapor phase epitaxy (HVPE) reactor. The photo-assisted heating system comprises an infrared light heater which is placed inside the reactor and right above a graphite substrate, an infrared light heater which is placed at the outer bottom of the reactor and below the graphite substrate, an infrared light heater which is placed outside the reactor and above the lateral upper part or below the graphite substrate to one side and encircles a reactor quartz tube, and a resistance wire heater which encircles the other parts of the reactor quartz tube. By adopting the photo-assisted heating system provided by the invention, the substrate can be rapidly and evenly heated, and especially, the requirements of evenly heating the large-area substrate can be met.

The invention provides a method for performing surface modification on a polymer by using a phenol derivative. The method specifically comprises the following steps of: firstly, generating a macromolecular chain free radical on the surface of an organic polymer by using the hydrogen abstraction reaction of a Norrish II photo initiator; secondly, by using the phenol derivative, generating a C-O covalent bond through a photo-assisted free radical coupling reaction and forming a monomolecular film of the phenol derivative on the surface of the organic polymer; thirdly, introducing different functional groups on the surface of the polymer by using different molecular substituent groups of the phenol derivative; and finally, by combining a photo mask, selectively introducing the groups to a specified area on the surface to form designed patterns. Through the method of the invention, the surface modification can be performed on all organic polymers of which molecular chains contain C-H bonds. The method is mainly characterized by introducing specified functional groups to the specified area of the surface of a product to form the designed patterns and has the advantages of simple implementation, short reaction time, no influence to the inherent performance of the product and low equipment cost.

The invention provides a preparing method of a vertical structure light-emitting diode (LED) chip. The preparing method corrodes a sacrificial layer in an epitaxial layer of an LED into a porous structure mainly through an electrochemical or photoelectrochemical etching or photo-assisted electrochemical etching method. The bonding strength between the upper and lower epitaxial layers of the sacrificial layer becomes quite weak, and the upper and lower epitaxial layers of the sacrificial layer can be easily peeled off. Compared with a vertical structure LED prepared by a laser lift-off method,the preparing method can solve the problem that the quality of an epitaxial layer material becomes poor due to laser ablation, and the yield is low.