61results about "Water/sewage treatment by irradiation" patented technology

The invention discloses a preparation method of a graphite type carbon nitride photocatalytic material, belonging to the field of the material preparation and photocatalytic technology. The graphite type carbon nitride photocatalytic material takes dicyandiamide and barbituric acid as co-precursors, adopts lithium chloride and potassium chloride as heating mediums, and is prepared in protective atmosphere through directly burning. The prepared g-C3N4 has excellent visible light absorption ability and the laminated structure characteristics, and has the degradation efficiency up to 83.8% to rhodamine B within 90min under visible light. The preparation method is simple, the raw materials are easily available, the visible light catalytic efficiency is high, and the graphite type carbon nitride photocatalytic material has wide application prospect in the photocatalytic field.

The invention relates to a method for disposing organic wastewater by photocatalysis of double rotating table photocell liquid film reactor in the technical field of environmental catalysis. TiO2 photocatalyst is loaded on the base and is used as photo anode, which is fixed together with the cathode on the rotating shaft for forming a double rotating table, the lower half of the double rotating table is immerged in wastewater, and the double rotating table is connected with the carbon brush connecting with the rotating shaft by leads. The motor is started, and the rotate speed of the double rotating table is controlled, thus a layer of liquid film is formed on the surface of the double rotating table. An uviol lamp is taken as the excitation light source, the photoinduced electrons on the surface of the photo anode of the TiO2 film rotating table is transferred to the surface of the cathode of the rotating table, the photoinduced electrons react with the saturated dissolved oxygen on the surface of the cathode rotating table so as to generate H2O2, and the indirect oxidation to organic matter and the direct oxidation to organic matter by photo cavity on the surface of TiO2 film photo anode rotating table improve the degradation efficiency; and the rotation of the rotating table speeds up exchange and update of electrode surface and bulk solution substance, mass transfer is strengthened, and higher effect thereof can be realized.

The invention relates to the field of photocatalysis, and particularly relates to a visible-light-driven photocatalyst for degrading dye in wastewater, and preparation and application thereof. The visible-light-driven photocatalyst for degrading dye in wastewater is characterized in that mesoporous silicon dioxide of which the framework contains Ti atoms is used as a carrier, the mesoporous silicon dioxide carrier carries graphitic carbon nitride, and bivalent Cu ions are doped on the graphitic carbon nitride, wherein the graphitic carbon nitride with the doped cupric ions serves as a main catalyst, and the element Ti serves as a cocatalyst. The Ti atoms contained in the framework of the mesoporous silicon dioxide directly react with H2O2 in a photo-Fenton-like system to produce hydroxyl free radicals, thereby obviously improving the photo-Fenton-like reaction activity. The photocatalyst provided by the invention catalyzes degradation of methyl orange and/or rhodamine B in wastewater, and degradation can be performed at room temperature under the irradiation of visible light, thereby enabling the photocatalyst to have the advantages of mild reaction conditions, low cost and easy implementation; and the photocatalyst can be easily regenerated, and still has excellent photocatalytic performance after being regenerated many times.

The invention relates to the technical field of water treatment, and particularly relates to and discloses a treatment method for recycling high-hardness and high-salinity waste water. The treatment method comprises the following steps: (1) removing organic matters, softening and removing salt for the first time by using a primary treatment system; (2) removing organic matters, softening and removing salt for the second time by using a secondary treatment system; (3) performing evaporation and freezing crystallization treatment on concentrated liquid. According to the treatment method for recycling high-hardness and high-salinity waste water, a physical and chemical treatment and membrane integrated technology and an evaporation and freezing crystallization technology are combined, high-quality water can be recycled, the resin is softened to regenerate internal supply of an acid and alkali medicament, industrial salt is generated, resources are utilized effectively and comprehensively,long-term effective and stable operation of the system is guaranteed, and the advantages of good treatment effect, stable and reliable operation and capability of completely utilizing resources are achieved.

The invention provides a magnetic composite photocatalyst Ppy@CdS/ZnFe2O4 and a preparation method and application thereof. The preparation method comprises the following steps of ZnFe2O4 preparation, CdS/ZnFe2O4 preparation and Ppy@CdS/ZnFe2O4 preparation. The composite photocatalyst Ppy@CdS/ZnFe2O4 established through a molecular imprinting technology can form a Z-type heterojunction due to printing layer selectivity and CdS and ZnFe2O4 matching, so that a composite photocatalytic material prepared by the magnetic composite photocatalyst has certain selectivity and catalytic activity.

The invention relates to phosphor doping type nano titanium dioxide having efficient sunlight catalytic capability and a preparation method thereof. The average grain size of the phosphor doping type nano titanium dioxide is no more than15nm, and the specific surface of the nano titanium dioxide is 126.9m<2>/g. The preparation method is: taking tetrabutyl titanate as titanium source and phosphoric acid as phosphorus source, and using sol-gel method to synthesize phosphor doping type nano titanium dioxide grains; and grinding the obtained solid to be fine, and calcining at 400-900 DEG C to obtain P doping nano titanium dioxide grains. The best calcination temperature is 500 DEG C. The invention only requires to add phosphoric acid in alcoholic solution of tetrabutyl titanate to obtain phosphor doping nano titanium dioxide grains. When the nano grains are used for performing photocatalytic degradation on dye rhodamine B, sunlight can be directly adopted as the light source, and under the same conditions, the efficiency of photocatalytic degradation can exceed the commercial P25.

A fluid treatment apparatus particularly for sterilising drinks comprises an elongate tubular duct (110) and an elongate UV light source (111) extending longitudinally of the duct (110). The fluid flows longitudinally of the duct (110) in a thin annular low passage (114) which extends around the UV light source (111). A mixing device (112) disposed between adjacent longitudinal portions of the duct (110) for diverts all of the fluid flowing along a first portion of the passage (114) through fluid mixing means (113,116) in the device (112) and returns the mixed fluid to a second portion of the passage (114). Micro-organisms in the thin flow of fluid are killed as they come within close proximity of the light source (111). The mixing device (112) causes all of the flow to be thoroughly mixed and returned to the flow passage (114). The provision of a plurality of mixing devices along the length of the duct (110) increases the likelihood that all microorganisms receive a sufficient lethal dose of UV radiation.

An apparatus for the photocatalyitc oxidation of common industrial effluent contaminants in aqueous solution includes a reactor and a thin film photocatalyst fixed to a support material like Cuddapah stone. The support material is preferably an inert material. The TiO2 preformed does not contain any adsorbent for making the thin film photocatalyst, The catalytic runs were carried out over TiO2 thin film fixed bed reactor. The study is extended to the immobilization of preformed TiO2 with a binder for making thin film using a simple spray technique on inert Cuddapah stone. This method of immobilization require no thermal treatment of the catalyst at high temperatures. The method is applicable for the photocatalytic treatment of industrial effluents at a higher scale. Also it is a method for preparing a photocatalyst adopted for the oxidation of industrial common effluent by simple spray technique. Also it is a method and apparatus for destroying industrial common effluent contaminants in aqueous solution

The invention discloses a micro-irrigation emitter, which comprises a water dropper, a spray-head and a drop-irrigation pipe (strip). The inner wall and/or the outer surface and/or a water outlet part of the micro-irrigation emitter are/is covered with a photocatalyst film coating layer. The micro-irrigation emitter of the invention has the advantages of: 1) a sterilizing function, namely, nano-TiO2 can damage cell membranes of cells because of super-oxidation decomposition capacity to cause cytoplasm loss to further cause the death of bacteria, which can prevent the occurrence of biological clogging; 2) a water purification function, namely, the micro-irrigation emitter has the function of eliminating water pollution and removing organic harmful substances in water so as to avoid chemical jamming; 3) a self-cleaning function, namely, the nano-TiO2 has extremely strong hydrophilicity so as to effectively prevent dust from being absorbed and staying to further realize the self-cleaning function and relieve physical jamming; and 4) an anti-aging function, namely, the nano-TiO2 needs to absorb a great amount of ultraviolet light to produce a light-catalyzed reaction, so the micro-irrigation emitter has relatively stronger functions of absorption, reflection, scattering and the like on the ultraviolet light and has weatherability and ageing resistance.

The invention provides a domestic sewage reuse apparatus. The apparatus comprises a shell, a water inlet and a water outlet, and also comprises a precipitation chamber, a disinfection chamber and a deodorizing chamber, the water inlet is positioned at the upper end of the precipitation chamber, a flocculant introducing device is arranged at one side of the water inlet, a first filter screen and a second filter screen are arranged in the precipitation chamber in parallel from top to bottom, a flow division member for dividing flow of sewage discharged into the water inlet is arranged between the water inlet and the first filter screen, an inclined plate for restricting the movement of sludge is arranged between the second filter screen and the bottom surface of the precipitation chamber, the precipitation chamber communicates with the disinfection chamber, ultraviolet lamp areas and water permeation areas are transversely alternately arranged in the disinfection chamber in parallel, the disinfection chamber is connected with the deodorizing chamber, and the connection is provided with a deodorizing agent introducing device.

The invention discloses a preparation method of a graphene/titanium oxide composite visible light photocatalyst. The preparation method comprises the following steps: 1, taking graphene oxide, dispersing the graphene oxide in an alcohol-water solution, and carrying out ultrasonic treatment on the obtained mixed dispersion for a period of time; 2, slowly dropwise adding a TiCl4 solution to a solution obtained after the ultrasonic treatment while stirring; 3, continuously magnetically stirring a solution obtained after the dropwise addition for a period of time; and 4, transferring a solution obtained after the stirring to a hydrothermal reaction kettle, carrying out a heating reaction in an oven, cooling the obtained reaction product, filtering the cooled reaction product, washing the filtered reaction product, and drying the washed reaction product to obtain the visible light response photocatalyst. The preparation method of the composite visible light photocatalyst is simple, raw materials are easy to purchase, have low prices and are environmentally-friendly, and the problem of increase of the solar energy utilization rate, caused by expansion of the absorption spectrum to visible lights, by narrowing the forbidden bandwidth of catalysts is solved. The graphene/titanium oxide composite visible light photocatalyst prepared in the invention can be widely applied to sewage treatment and air purification.

The invention discloses a graphene hybridized photocatalyst hydrogel, belonging to the field of nanometer materials. The graphene hybridized photocatalyst hydrogel is used for treatment of water pollution and prepared by using graphite oxide and a photocatalyst as raw materials through a reduction reaction and ultrasonic treatment. The graphene hybridized photocatalyst hydrogel provided by the invention can promote the dispersion of graphene oxide in water, avoids further aggregation of a nanoscale photocatalyst from generation in the process of hydrogel formation, can significantly improve the specific surface area and adsorption capacity, has more obvious three-dimensional cross-linked mesoporous microstructure, can realize the synergistic effect of adsorption enrichment and photocatalytic degradation, significantly reinforces the in-situ catalytic degradation ability of adsorbed and enriched pollutants, and can greatly improve the mineralization and removal efficiency of pollutants.

The invention provides an industrial water recycling and reusing device which comprises a regulating tank, a settling tank, a water storing tank, a first grid, a second grid, biological films, a sludge pump, an ultraviolet lamp, a filter screen, a filer film and an ozone machine .The first grid is installed at the upper end of the regulating tank, the second grid is assembled under the first grid, and the biological films are assembled on a support plate; a sludge port is formed in the bottom of the settling tank, the sludge pump is installed at the lower end of the sludge port, and a sludge output pipe is assembled on the upper portion of the sludge pump; the ultraviolet lamp is installed at the top of the water storing tank, the filter screen is assembled in the water storing tank, and the filter film is assembled at the lower end of the filter screen; an ozone inlet is formed in the bottom of the water storing tank, and the ozone machine is installed under the ozone inlet .According to the industrial water recycling and reusing device, the industrial water recycling and reusing functions are effectively achieved, purifying treatment is conveniently conducted on sewage, the sewage treatment effect is improved, water is saved, and the water resource using efficiency is improved.

The invention belongs to the field of domestic sewage treatment, and particularly relates to an ozone-assisted photocatalytic sterilization device, which comprises an ozone generation system, a first control valve, a gas flow meter, a filter, a liquid flow meter, a second control valve, a jet flow mixing device and a photocatalytic reactor, wherein the ozone generation system is connected with the gas flow meter through the first control valve; the filter is connected with the liquid flow meter through the second control valve; the jet flow mixing device is provided with a gas inlet, a liquid inlet and an outlet; the gas flow meter is connected with the gas inlet of the jet flow mixing device; the liquid flow meter is connected with the liquid inlet of the jet flow mixing device; the outlet of the jet flow mixing device is connected with the photocatalytic reactor. The device has the beneficial effects that a process flow is simple, the device is easy to operate, and has good sterilization and disinfection effects, and the treatment cost is effectively lowered.

The invention discloses a polyaniline/perylene bisimide organic heterojunction photocatalyst and a preparation method and application thereof, which comprises the following steps: simultaneously cooling an aniline and protonic acid mixed solution A and an ammonium persulfate aqueous solution B to below 4 DEG C, quickly mixing to react, and obtaining polyaniline aerogel through the steps of soaking, washing and drying; in an argon atmosphere, putting perylene-3, 4, 9, 10-tetracarboxylic dianhydride, [beta]-alanine and imidazole into a three-necked flask, performing heating at 100-120 DEG C, performing starting to stir until a solid is dissolved, and continuing to react for 4 hours at the temperature; cooling to room temperature, dispersing the mixed solution into an ethanol and hydrochloricacid mixed solution, and continuously stirring for 20-30 hours; and performing filtering, washing and drying to obtain the perylene bisimide photocatalyst. The polyaniline/perylene bisimide organic heterojunction photocatalysts with different mass ratios are prepared by adopting an in-situ growth method. The polyaniline/perylene bisimide organic heterojunction photocatalyst obtained by the invention has a good application prospect in wastewater treatment and hydrogen peroxide preparation.

The invention relates to a device and method used for organic waste water treatment of a laboratory. Organic waste water, EDTA waste water and acidic waste water of the laboratory are injected into a reaction kettle till the waste water immerses positive electrodes and negative electrodes. The PH value of reaction liquid in the reaction kettle is controlled to range from 2 to 4. A stirring mechanism, an electromagnetic device, an aeration device and a circulating pump are started to supply power to the positive electrodes and the negative electrodes. The current intensity of the positive electrodes and the negative electrodes is regulated and controlled to be 1.4-1.6 A. The magnetic field intensity is regulated and controlled to be 590-600 mt. A reaction is conducted. By means of the technical scheme, the organic waste water of the laboratory can be reliably treated, and equipment manufacturing cost is low.

The invention discloses a preparation method of an Ag2Se/GO nano material with a micro-flower structure and application of the nano material in photocatalytic degradation of textile waste liquid. Thepreparation method comprises the following steps: pouring a mixed solution containing a silver source and a selenium source into a high-pressure reaction kettle which is lined with polytetrafluoroethylene and contains graphene oxide sheets, and then sealing and placing in a reaction furnace to perform heating for reaction to obtain the nano material with the Ag2Se/GO micro-flower structure, wherein the mixed solution containing the silver source and the selenium source is prepared by dissolving silver nitrate in deionized water, adding EDTA, mixing uniformly, adding selenium powder and sodiumborohydride into the mixed solution, and stirring uniformly. The Ag2Se/GO nano material with the micro-flower structure synthesized by the preparation method has excellent photocatalytic performance and can be used as a photocatalyst to purify textile wastewater, degrade colored dyes and the like.

The invention provides a high-collimation ultraviolet anti-fouling device and a preparation method thereof. The high-collimation ultraviolet anti-fouling device comprises a base plate; an ultravioletlight source is arranged on the upper side of the base plate; a sealed shell is arranged on the outer side of the ultraviolet light source; the sealed shell and the base plate are connected through asealing device; a collimating lens is arranged on the ultraviolet light source; gas is arranged in the sealed shell; and light of the ultraviolet light source is refracted through the collimating lensand is centrally irradiated on the working part of a sensor, so the anti-fouling effect is improved.

A preparing method of a Ag3PO4@Ag/carbon sphere ternary heterojunction composite material capable of selectively removing cationic dye is disclosed. The method includes subjecting a glucose solution having a mole concentration of 0.5 mol/L to a hydrothermal reaction in a hydrothermal reaction kettle at 180 DEG C for 5-8 h to obtain carbon spheres having an average diameter of 0.3-0.7 [mu]m; addingdropwise ammonia water having a concentration of 10-25 wt% into a AgNO3 solution having a concentration of 0.05-0.2 mol/L to prepare a transparent Tollens' reagent; adding the carbon spheres into theTollens' reagent with the mass ratio of the carbon spheres to the AgNO3 being 0.01-0.1:1 and stirring the mixture for 2-10 h; adding dropwise a Na2HPO4 solution into the mixture with the mole ratio of Ag<+> to PO<4><3-> being 3:1-10; reacting the mixture for 1-3 h; then performing centrifugation, filtration and washing; and drying a product in a vacuum drying oven at 50 DEG C to obtain the composite material. The composite material can rapidly and efficiently remove cationic dye and the synthesized composite material has good stability.

The invention discloses a three-dimensional material based on a copper sulfide lamellar structure and a preparation method thereof. The material comprises copper sulfide nano sheets which grow perpendicularly to a foam copper skeleton, and the diameter of the copper sulfide nano sheets is 5-8 micrometers. The material is characterized in that foam copper is used as a substrate skeleton material, and the copper sulfide lamellar nano structure is perpendicularly grown on the surface of the foam copper. The preparation method comprises the following steps: dispersing sulfur powder into methanol,adding the foam copper into the prepared sulfur powder methanol dispersion liquid, placing the obtained material in a reaction kettle, and keeping a temperature of 60-90 DEG C for 3-6h. The copper sulfide lamellar structure provided by the invention has the advantages of a simple preparation process and high catalytic activity, thus the three-dimensional material based on the copper sulfide lamellar structure has potential application prospects in the fields of photocatalysis, catalyst carriers, electrochemical hydrogen storage and the like.

The invention relates to the field of water purification, and discloses an oily water purifying agent and a preparation method thereof. The method comprises the following steps: mixing butyl titanate, carbon nanotubes, brucite fibers, endellite fiber nanotubes, anhydrous ethanol and toluene to prepare a solution A; mixing anhydrous ethanol, acetate acid gracial and water to prepare a solution B; dropwise adding the solution B to the solution A to prepare a sol solution; ageing the sol solution, adding anhydrous ethanol to the sol solution in order to carry out solvent displacement, adding n-hexane to the sol solution in order to carry out solvent displacement, carrying out separation to remove n-hexane in order to obtain wet gel, and hydrophobically modifying the wet gel; and drying the hydrophobically modified wet gel to prepare composite aerogel, and processing the composite aerogel to form granules or blocks in order to obtain the oily water purifying agent. The oily water purifying agent has the advantages of high oil removal efficiency, no recovery of the purifying agent, and no secondary pollution to water.

The invention discloses a method for preparing a vanadium-doped gallium antimonate visible light photocatalyst. The method comprises the following steps: (1) stirring and mixing gallium nitrate, antimony pentoxide, ammonium metavanadate and deionized water at room temperature, regulating the pH value to 1-5 through 2-6mol/L of nitric acid, and obtaining a nano powder precursor solution; (2) arranging the nano powder precursor solution in a high pressure reactor, raising the temperature to 100-200 DEG C at a speed of 1-5 DEG C per minute, preserving the temperature for 6-48 hours, carrying out hydrothermal reaction, naturally cooling to room temperature, taking the product out, washing by using deionized water and absolute ethyl alcohol, drying in a drying box at the temperature of 60-80 DEG C, and obtaining the vanadium-doped gallium antimonate visible light photocatalyst. The preparation of gallium antimonite nanoparticles and a vanadium doping process are synchronously realized, and the method is simple in process, easy to control and suitable for industrial production and application. The prepared vanadium-doped gallium antimonate visible light photocatalyst is high in visible light utilization rate and high in catalytic efficiency and can be used for treating wastewater containing organic pollutants.

The invention discloses a sewage treatment system, which comprises a cloud server, a programmable logic controller (PLC), a sewage treatment unit and a water quality analysis unit. The PLC is electrically connected with the sewage treatment unit; the cloud server is in wireless connection with the PLC and the water quality analysis unit; the water quality analysis unit is used for acquiring the sewage water quality parameters of all links during the sewage treatment process, and transmitting the sewage water quality parameters to the cloud server; the cloud server is used for storing the sewage water quality parameters and adjusting parameters, and distributing the corresponding adjusting parameters to the PLC according to the current sewage water quality parameters; the PLC controls the sewage treatment unit to execute corresponding action according to the adjusting parameters; the sewage treatment unit is used for staged-treating sewage according to the adjusting parameters until theemission standard is met. The sewage treatment system provided by the invention has the characteristics of high automation degree and deep sewage purification treatment degree.

The invention discloses a preparation method and application of a nanocomposite oxygen-doped molybdenum disulfide/titanium dioxide nanotube array. According to the principle of the preparation method, a TiO2 nanotube array prepared through an anodic oxidation method is placed in a mixed solution containing ammonium heptamolybdate, thioacetamide, sodium dithionite and ammonia water, MoOxSy nanoparticles are deposited on the TiO2 nanotube array through a simple chemical bath deposition method, and the MoOxSy/TiO2 nanotube array is obtained. The method has the advantages that the chemical bath deposition method is simple in process, mild in condition, energy-saving and environment-friendly. The prepared MoOxSy/TiO2 nanotube array grows on a titanium foil substrate in situ, is vertically arranged, is uniform in size and can be directly used as a photoelectrode for photoelectrocatalytic degradation of tetracycline hydrochloride, and the degradation efficiency of the MoOxSy/TiO2 nanotube array is 1.5 times that of the TiO2 nanotube array.