1627results about How to "Improve photocatalytic efficiency" patented technology

The invention provides a preparation and application method for photocatalysis environmental protection type painting, which relates to construction painting, especially provides a preparation and application method for photocatalysis function painting, which includes steps: mixing titanium-containing organic, water, chelating agent and hydrolysis inhibitor to prepare nano anatase type titanium dioxide water sol; adding metal, oxide or impure titanium dioxide photocatalyst into the titanium dioxide water sol and stirring equably. Using method is coating inorganic isolated layer firstly and coating the photocatalysis painting after drying. Advantages of the invention are: the prepared painting and using technique can be widely used for inner and outer wall surface of building and is harmless to bottom ainting, photocatalysis efficiency is high, cost is low, bonding is firm, transparency is good, preparation is simple, and usage is easy.

The invention relates to a carrier-type TIO2 photo-catalyst, it's preparing method, and a high-absorbability photo-catalysis water purifier made from said material. Said carrier-type TIO2 photo-catalyst uses active carbon fiber base as substrate, which carries 100-600mgTIO2 / g active carbon fiber to form the TIO2 film in 100-300nm thick and the specific surface area in 150-400m2 / g. Said catalyst can be attained by powder plating method, liquid deposition method and sol-gel method of adhesive agent. The invention can keep the former space between active carbon fibers with the advantages that the liquid can freely enter the inner part of photo-catalyst and the ultraviolet light can radiate the inner part of photo-catalyst. The photo-catalysis water purifier with aforementioned carrier-type TIO2 photo-catalyst is in the shape of rectangle, while several photo-catalyst elements with said catalyst are inserted into the slot of purifier, the aeration system on the bottom can mix the treating liquid with air to reduce the mass transfer limit. Said purifier can effectively absorb the action bottom material; and improve the photo-catalysis process to apply the deeply-purification treatment of micro-pollution water.

The invention relates to an ozone / photocatalysis oxidation-membrane separation integrated method for advanced wastewater treatment. First, an ozone / oxygen gas mixture is dissolved in the wastewater through a gas-liquid mixer to generate high-concentration dissolvable ozone and oxygen; the ozone and oxygen enter into a photocatalytic reactor and produce a large number of strong oxidizing agents such as hydroxyl radicals under the combined action of dual band ultraviolet (185nm + 254nm) radiation and a suspension nano TiO2 catalyst, and the strong oxidizing agents, dissolved oxygen and dissolved ozone cooperatively oxidize and remove removal toxic and harmful substances, odor smell, chroma, virus and bacteria in the water; and a three-phase fluid of wastewater, catalyst and gas passes through a ceramic membrane filter, the wastewater permeating through the ceramic membrane reaches the standard and is discharged, and the concentrated water with suspended catalyst failing to permeating through the ceramic membrane is returned to a backwater bin for further participation in the gas-liquid mixing and ozone / photocatalytic reaction. The process and device involved in the invention have the advantages of high wastewater treatment efficiency, high recovery rate of catalyst, high utilization efficiency of ozone and long service life of membrane.

The invention relates to a silver-modified carbon nitride composite photocatalytic material and a preparation method thereof. The preparation method comprises: dissolving dicyanodiamide or melamine in deionized water or dimethyl sulfoxide and performing ultrasonic dispersing, so as to obtain a dicyanodiamide or melamine dispersion liquid; dissolving silver nitrate in deionized water and stirring uniformly, so as to obtain a silver nitrate solution; slowly dropwise adding the silver nitrate solution into the above dicyanodiamide or melamine dispersion liquid under the condition of magnetic stirring, and continuing stirring the solution, so as to obtain a mixed precursor solution; using anhydrous ethanol and deionized water repeatedly wash the obtained mixed precursor solution for multiple times, and performing vacuum drying; and putting the obtained product in a proper crucible and covering, putting in a high-temperature furnace, and sintering for a period under the condition of nitrogen protection, so as to obtain a powdery sample. The advantages comprise that the raw material source is wide, the preparation technology is simple and practicable, and the cost is relatively low; and the prepared composite photocatalytic material has relatively good photocatalytic degradation effect on organic dye rhodamine B under irradiation of visible light.

The invention discloses a composite material used for catalyzing and degrading nitrogen oxide and its preparation method and application thereof. The invention of the hollow g-C3N4 nanospheres / reduced graphene oxide composite-polymer carbonized nanofiber material is prepared as follow: 1) the preparation of silica nanospheres; 2) the preparation of hollow g-C3N4 nanospheres; 3) the preparation of graphene oxide; 4) the preparation of surface modified hollow g-C3N4 nanoparticles preparation; 5) the preparation of composites; 6) the preparation of composite-polymer carbon nanofiber material. The raw materials used in the process is low cost and easy to get; the operation of the invention is simple and convenient without the use of expensive equipment in the whole process; the composite has high adsorption efficiency of ppb level nitrogen oxide with good repeatability.

The invention relates to a preparation method of a ZnO / g-C3N4 composite photocatalyst. A two-stage solvent thermal / ultrasonic dispersing method is employed to prepare the ZnO / g-C3N4 composite photocatalyst. After the two-stage solvent thermal treatment, porous ZnO nano crystalline with high dispersion grown on the g-C3N4 can be obtained, and the ZnO nanocrystalline and the g-C3N4 can form a good composite structure; the ultrasonic treatment reduces agglomeration among the ZnO / g-C3N4 composite particles, and improves dispersion of the composite catalyst; and the nano composite particles with high dispersion strengthen effective utilization of sun light by the catalyst, and improve activity of the catalyst. The preparation method provided by the invention has the advantages of cheap raw materials and simple process; and the prepared composite photocatalyst has a broad application prospects in the fields of wastewater treatment and gas purification.

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 relates to a preparation method of a titanium dioxide / graphene composite photocatalyst. The invention is to solve the technical problems that titanium dioxide in a titanium dioxide / graphene compound prepared by the traditional method has a large particle size and low photocatalytic efficiency. The preparation method comprises the following steps that: tetrabutyl titanate is added to a graphene oxide dispersion solution, a concentrated acid is added to adjust the acidity after ultrasonic dispersion, and then deionized water is added to continue to carry out ultrasonic treatment to obtain sol; and then the sol is transferred to a hydrothermal reaction kettle to be subjected to hydrothermal reaction, and then is washed and dried to obtain the titanium dioxide / graphene composite photocatalyst. The particle size of the titanium dioxide in the composite photocatalyst provided by the invention is 5 to 10nm, and the composite photocatalyst can be used for visible light catalytic degradation of methyl orange, and the catalytic efficiency can reach 75% within 2 hours. The titanium dioxide / graphene composite material provided by the invention can be used as a photocatalytic material, a solar cell material and a lithium ion battery cathode material.

The present invention discloses a three-phase ultrasonic photo-catalyzed reaction device and a CO2 reducing method with the device. With the device, a photo-catalyst is placed in a photo-reactor, and the reactor is placed in a water bath of an ultrasonic generator. A light source is arranged above the photo-reactor. The method is that the CO2 gas to be reduced is mixed evenly with the photo-catalyst and a sodium hydroxide solution in the photo-reactor under the ultrasonic action, and reacts for 3-20 hours with radiation of the light source. Then the CO2 gas is reduced. The photo-catalyst is made from titanium dioxide or silicon dioxide and metal phthalocyanine. Metal phthalocyanine is supported on the surface of titanium dioxide in the way of in-situ synthesis, sol-gel, and immersion. The present invention promotes the photo-catalysis efficiency, reduces the reaction time, and saves the energy. Visible light can be used for reducing. Moreover, the phot-catalyst can be recycled, which reduces the pollution and the cost, sot the present invention is quite applicable for the three-phase ultrasonic photo-catalyzed reaction device and photo-catalyzed CO2 reducing.

The invention discloses an environmental function nano-material-Cu2O / TiO2 nanotube array and a preparation method thereof. A TiO2 nanotube array is placed in 5mmol-20mmol of CuSO4 solution, and copper is electrodeposited on the TiO2 nanotube array in a standard three-electrode system by using pulse plating so as to obtain the Cu / TiO2 composite nanotube array; and after the deposition, the Cu / TiO2 composite nanotube array is electro-oxidized for certain time in an alkaline solution NaOH to obtain a TiO2 nanotube array modified by ultrafine Cu2O nanowires with the diameter of less than 5 nanometers. The nanaowires are intertwined and connected to from a network structure to be attached to the TiO2 nanotube array but do not fully block TiO2 nanotubes; the Cu2O / TiO2 nanotube array is very favorable for the transmission of photo-carriers, reduces the recombination probability of electron-hole pairs, effectively expands the absorption range of TiO2 in the visible region, reduces optical corrosion, improves photoelectric conversion efficiency, and shows good photocatalytic efficiency.

The invention discloses a metal-graphene-titanium dioxide nanotube array photocatalyst and a preparation and application method thereof. Graphene and metal are taken as common carriers of photo-induced electrons of titanium dioxide, thus the recombination rate of the photo-induced electrons and holes is lowered, and finally, the degradation efficiency of the catalyst to organic pollutants is improved through the adsorption performance of the graphene to the organic pollutants. The catalyst has good performance in the aspect of treating water pollutants, and has the advantages of simple preparation method and low cost.

The invention discloses a coating used for purifying automobile tail gas in tunnels and underground parking lots, which consists of 20-40 parts of silicon acrylic emulsion, 10-30 parts of photocatalytic titanium dioxide nano powder, 5-15 parts by weight negative ion powder, 5-10 parts of ultra-fine diatomite, 10-20 parts of water, 5-15 parts of ordinary titanium dioxide, 4-8 parts of heavy calcium carbonate, 5-10 parts of light calcium carbonate, 1-2 4 parts of propylene glycol, 0.2-0.4 parts of leveling agent, 0.3-0.8 parts of thickener, 0.2-0.4 parts of defoamer, 0.8-1.5 parts of dispersant and 0.3-0.4 parts of wetting agent. The coating of the present invention has added high-efficiency adsorptive diatomite, which can enhance the adsorption of harmful gases and enhance the treatment effect; the adhesion between the coating made of nanoparticles and the substrate is improved; the nano photocatalytic coating of the present invention has The photocatalytic efficiency is high, and it has the effect of releasing negative ions, and can effectively purify the air; the nano photocatalytic coating of the present invention is very convenient for construction, and the thickness of the coating can also be adjusted according to the viscosity of the coating.

The invention belongs to the technical field of functional concrete, and relates to a concrete material having a function of purifying gas-solid pollutants. The concrete material is characterized by being prepared from the components of cement, fine aggregate, coarse aggregate, water, water reducing agent, photocatalyst, an alkali solution and retarder, wherein the cement is 260-530 kg / m<3>, the silica fume content is 0-10 wt% of the cement content, the fly ash content is 0-25 wt% of the cement content, and the slag content is 0-40 wt% of the cement content; the coarse aggregate is 255-850 kg / m<3>, and the sand ratio is 30-45%; the water is 155-220 kg / m<3>; the mixing amount of the water reducing agent accounts for 0.5-1.2% of the total weight of the cement; the photocatalyst is 5-25 g / m<2>; the retarder content accounts for 0.01-1.0% of the weight of the cement to be removed on the surface layer of the concrete; the photocatalyst is put into the alkali solution to prepare a mixture; and the concentration of the photocatalyst is 1-5 g / L. The concrete material prepared by the method has a function of purifying gas-solid pollutants.

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 preparation method and application of a cadmium sulfide / graphite like carbon nitride (CdS / g-C3N4) composite visible light catalyst. The preparation method of the catalyst is a chemical precipitation method which is performed in an alkaline environment, wherein g-C3N4 is taken as a matrix, and CdCl2 and Na2S are taken as raw materials. The weight ratio of CdS to g-C3N4 in CdS / g-C3N4 is (1:2)-(5:1), and when the composite visible light catalyst is used for visible light catalysis treatment of methylene blue and methyl violet solutions, a better degradation effect can be obtained; and furthermore, the catalyst can still keep higher catalytic activity after being reused for five times. The composite visible light catalyst disclosed by the invention has important significance for development of the visible light catalyst, and also has good application prospects in treatment of dye wastewater.

The invention discloses a method for preparing metal doped TiO2 nanocrystal particles. The method comprises the following steps: dispersing a titanium source in a metal ion aqueous solution, hydrolyzing to obtain metal ion doped hydrated titanic acid precipitation, dispersing the metal ion doped hydrated titanic acid precipitation in a hydrogen peroxide aqueous solution, and hydrothermally reacting to obtain the metal doped TiO2 nanocrystal particles. The method for preparing the metal doped TiO2 nanocrystal particles, which is disclosed by the invention, can be used for preparing metal doped monodisperse and suspended TiO2 nanocrystal particles with visible-light activity, and the method has a good application prospect in the fields of photocatalytic air purification, photocatalytic water treatment and the like.

A heterojunction composite material consisting of one-dimensional In2O3 hollow nanotube and two-dimensional ZnFe2O4 nanosheets and its application are disclosed. When using this material for catalytic reactions, the hollow cavity and two-dimensional nanosheets of hollow nanomaterials can not only reduce the migration distance to accelerate the electron-hole separation, but also provide a large surface area and rich active sites to promote pollution adsorption and surface catalysis. At the same time, multiple light scattering or reflection in the hollow cavity of the hollow nanomaterials can increase light absorption and utilization. In addition, the heterojunction photocatalyst constructed by growing two-dimensional semiconductor nanosheets on a tubular substrate can promote the effective separation of photogenerated electrons and photogenerated holes, thereby improving the catalytic efficiency. In terms of catalytic performance, In2O3 @ ZnFe2O4 shows effective degradation of tetracycline, and due to its ferromagnetism, it shows convenient and good separation effect and has good recycling performance.

The invention discloses a loaded multifunctional catalysis composite material, a preparation method thereof and an application of the composite material to catalytic removal of water pollutants. The preparation method includes the steps: preparing a zinc oxide nano-sheet loaded nickel foam (Ni@ZnO) composite material by an electro-deposition method; compounding molybdenum disulfide micro-nano particles on ZnO porous nano-sheets by an electro-deposition method to obtain Ni@ZnO / MoS2. The composite material Ni@ZnO / MoS2 combines the advantages of components such as nickel foam, the zinc oxide nano-sheets and molybdenum disulfide from the point of material performances, high catalytic degradation activity and recycled performances are achieved, photo-catalysis and electro-catalysis are combined from the point of material application, and the catalytic activity of the composite material is improved by the aid of synergistic effects of photo-catalysis and electro-catalysis.

A lamp including a reflective portion is utilized in a fluid purification system to maximize the light delivery to a photocatalytic coating that oxidizes gaseous contaminants that adsorb onto the surface to form carbon dioxide, water, and other substances. An ultraviolet light source positioned proximate to the honeycomb activates the titanium dioxide coating. In one example, the reflective portion is a reflective coating. Light directed out of the non-reflective portion of the lamp travels towards the honeycomb and absorbs onto the photocatalytic coating. Light directed towards the reflective portion on the lamp is reflected off the surface of the reflective portion and passes through the non-reflective portion of the lamp to also absorb onto the photocatalytic coating. The reflective portion reflects light towards the honeycomb that would otherwise be misdirected away from the honeycomb, increasing efficiency of the fluid purification system.

The invention relates to a preparation method of nanocrystals, particularly a preparation method of {001} face exposed titanium dioxide nanocrystals. The invention solves the technical problems of large particle size and small specific areas in the {001} face exposed titanium dioxide nanocrystals prepared by the existing method. The method comprises the following steps: 1. preparing protonized titanic acid hydrate; 2. washing the protonized titanic acid hydrate with alcohol, transferring into a polytetrafluoroethylene hydrothermal kettle, adding alcohol and a hydrofluoric acid water solution, keeping the temperature, carrying out centrifugal separation to obtain a precipitate, washing with water, washing with alcohol, drying, and grinding to obtain the {001} face exposed titanium dioxide nanocrystals. The titanium dioxide product obtained by the method is a pure anatase phase, the exposure rate of the {001} face is 26-66%, the maximum specific area is 155m<2>g<-1>, and the minimum average particle size of the crystals is 11nm.

The invention discloses a method for preparing a nitrogen doped titanium dioxide visible light catalyst. The process includes the following steps (by weight) : (1) 1% to 15% titanate, 0.5% to 10% hydrolyst and 75% to 95% diluent agent are placed in reactor and react for 5 to 40 hours by irradiation of ultraviolet lamp at 15 to 30 degrees C.; 0.1 to 5% ammonium salt solution is added into reactor to give sol after reacting for 1 to 5 hours; solvent is volatilized and dried for 1 to 3 hours at 50 to 200 degrees C. after titanium sol is obtained. The catalyst has excellent visible light catalytic activity.

A process for preparing the photocatalyst of mesoporous TiO2 powder or film by the sol-gel method includes such steps as preparing solution from n-butyl titanate, low-carbon alcohol and diethanolamine, adding polyethyleen glycol to obtain transparent precursor sol, evaporating solvent out, drying, crushing, and calcining to obtain the photocatalyst. It has high photocatalytic efficiency and activity. The mesoporous powder and film prepared by the said process has vertically open porous structure which benefits the photocatalytic reaction and high activity.

The invention discloses a photoelectrocatalysis water electrolysis method, device and application thereof. Raw water is injected into a water electrolysis reactor separated with a photoanode compartment and a photocathode compartment, and raw water is decomposed into alkalescent water and acid water under the irradiation of light energy at least; wherein the photo anode chamber is internally provided with a photo anode and catalyst selected for anode material, photoproduction electron reduction potential thereof is less than the potential reducing H+ into H2, and photoproduction hole oxidation potential is more than the potential oxidizing OH- into O2, and the photo cathode chamber is internally provided with a photo cathode, and light energy irradiation faces the photo anode. By the water inlet, water outlet and air exhaust respectively arranged, raw water is electrolyzed into alkalescent water and acid water under the irradiation of light energy, compared with the traditional water electrolysis technology, no electric energy is required to be added, no complex control circuit is required, and photoelectrocatalysis efficiency is obviously improved.

The application of the invention discloses a preparation method for {100} crystal plane anatase TiO2 nano-particles. The preparation method comprises the following steps: performing hydration reaction on a titanium source to obtain hydrated TiO2 precipitation, and dispersing the hydrated TiO2 precipitation into an alkaline hydrogen peroxide solution for realizing a hydrothermal reaction so as to obtain the exposed active {100} crystal plane anatase TiO2 nano-particles, wherein the pH value of the alkaline hydrogen peroxide solution is 8-13. By the adoption of the preparation method for the {100} crystal plane anatase TiO2 nano-particles, the exposed active {100} crystal plane anatase TiO2 nano-particles of which particle sizes are less than 15 nanometers can be prepared.

The invention relates to a process for preparing a nanometer titanium dioxide ternary photocatalyst doped with nitrogen and rare earth elements. The process comprises the following steps of respectively preparing an aqueous solution of rare earth salt, an aqueous solution of titanium tetrachloride absolute ethanol and a nitrogen-containing compound solution; dropwise adding the aqueous solution of rare earth salt into a three-necked flask with a mixed solution, uniformly stirring and simultaneously dropwise adding the aqueous solution of titanium tetrachloride absolute ethanol and the nitrogen-containing compound solution, uniformly stirring, adding activated carbon, and further uniformly stirring; and finally aging at room temperature and drying to obtain a solid, grinding the obtained solid and calcining to obtain the nanometer titanium dioxide ternary photocatalyst doped with nitrogen and rare earth elements. The nanometer titanium dioxide ternary photocatalyst doped with nitrogen and rare earth elements, which is prepared by the process, has an efficient photocatalytic degradation effect on pollutants, especially organic pollutants.

The invention discloses a graphene / chitosan / cuprous oxide composite material and a preparation method and applications thereof, which belong to the technical field of visible light catalytic materials. The composite material mainly comprises graphene, chitosan and cuprous oxide, wherein the graphene has extremely good electron capture and transmission performances, and as a carrier of photo-generated electrons, the graphene reduces the recombination rate of photo-generated electrons and holes of the cuprous oxide; by using the excellent adsorption property of the graphene to organic pollutants, the photocatalytic efficiency of a photocatalyst is improved; a good synergistic effect exists among the composited chitosan, the graphene and the cuprous oxide, and while the adsorption effect of the catalyst is improved, the degradation performance of the visible light catalyst to organic pollutants is improved. Under same conditions, compared with cuprous oxide, and cuprous oxide / chitosan, the graphene / chitosan / cuprous oxide composite material shows higher adsorption capacity and photocatalytic properties.

The present invention relates to new photocatalyst material and its preparation process and application. The technological scheme is that the photocatalyst material consists of active carbon fiber and supported titania in the titanium element content of 12-15 wt%. Through dissolving tetrabutyl titanate in anhydrous alcohol, soaking active carbon fiber in the solution for 5-8 hr, heating the soaked active carbon fiber to 180-220 deg.C while introducing hot water vapor, calcining at 550-700 deg.C in nitrogen atmosphere and cooling naturally to room temperature, the supported photocatalyst material is prepared. When the photocatalyst material is used, the solution is irradiated with ultraviolet ray in the solution surface irradiation amount of 12.5-12.8 mW / sq cm at constant temperature of 20-40 deg.C while introducing air to maintain the concentration of dissolved oxygen. The present invention can degrade the methylene blue and sulfanilic acid in the solution completely.

The invention relates to a method for processing refractory organic wastewater through a TIO2 membrane electrode photoelectric rotating disk. A TIO2 photocatalyst is loaded in a base through the direct thermal oxidation method or the sol-gel method, and is fixed on a rotating shaft in a single-chip mode or a multichip series mode to form the photoelectric rotating disk, which is used as a photo anode and is positioned into a semi arc reaction groove, one half of the photo anode is immersed into wastewater, a Cu sheet is used as a cathode, and the photo anode and the cathode are respectively connected with the positive electrode and the negative electrode of a power supply. The voltage of the direct current power supply is adjusted, and a motor is started and the rotating speed of the photo anode is controlled through a speed controller to form a layer of liquid membrane on the surface of the photo anode. An ultraviolet lamp or sunlight is used as an excitation light source, the excitation light source can illuminate the surface of the photo anode catalyser only by penetrating the liquid membrane, the absorption of organic wastewater to light is greatly reduced, the utilization of the excitation light source and the photoelectricity catalyzing degrading efficiency are enhanced, and meanwhile the exchanging and updating of the liquor substances on the surface of the electrode and in the main body are accelerated through the rotation of the rotating disk, the mass transfer is strengthened, and the degrading efficiency is enhanced.

The invention discloses a modified graphite phase carbon nitride photocatalyst as well as a preparation method and application thereof. The modified graphite phase carbon nitride photocatalyst is prepared from urea and salicylic acid serving as raw materials by virtue of calcination, wherein a mass ratio of urea to salicylic acid is 1:(0.002-0.02). The modified graphite phase carbon nitride photocatalyst disclosed by the invention has the advantages of being high in specific surface area, wide in light absorption range, low in electron-hole pair recombination rate, excellent in photocatalyticperformance and the like, and has multiple reactive sites, excellent application value and application prospects. The preparation method has the advantages of being simple in process, wide in raw material source, low in cost, high in preparation efficiency, high in yield and the like, is suitable for large-scale preparation and is favorable for industrial production. The modified graphite phase carbon nitride photocatalyst disclosed by the invention can be used for degrading organic pollutants, has the advantages of being simple in process, convenient to operate, low in cost, high in treatmentefficiency, excellent in degradation effect and the like, and has excellent effects of degrading the various organic pollutants.