72results about How to "Good visible light response" patented technology

The invention relates to a monoatomic catalyst, and a preparation method and applications thereof. The preparation method comprises following steps: 1, a titanium dioxide nanometer material is subjected to reduction so as to obtain a defect state titanium dioxide nanometer material; 2, the defect state titanium dioxide nanometer material and ammonium carbonate are added into a solution containinga precious metal source until pH value ranges from 8 to 10, reaction is carried out, and separation is carried out so as to obtain a precursor, wherein in the precious metal source, the molar ratio ofprecious metal to titanium dioxide nanometer material is 1:480-520; 3, the precursor is subjected to calcining at 100 to 400 DEG C for 2 to 4h so as to obtain the monoatomic catalyst. The method process is simple; the calcining temperature is low; the obtained monoatomic catalyst is relatively high in single monomer loading capacity, and high in stability, possesses excellent visible light responsiveness, and high photocatalytic activity, and is especially high in water catalytic cracking hydrogen production efficiency, and can be recycled; and no pollution is caused.

The invention discloses a ternary efficient compound visible light photocatalytic material and a preparation method and application thereof. The preparation method is characterized by comprising the following steps: preparing N-K2Ti4O9 and g-C3N4 by a forging method, preparing an N-K2Ti4O9 / g-C3N4 binary composite material via electrostatic attraction, and further synthesizing an N-K2Ti4O9 / g-C3N4 / UiO-66 ternary efficient compound visible light photocatalytic catalyst via self-assembling by a solvothermal method. According to the invention, the characteristics of good visible light response of N-K2Ti4O9, high conduction electron hole capacity of g-C3N4 and high MOF material adsorption amount of UiO-66 are utilized; the ternary compound light catalyst synthesized by integrating the advantages of N-K2Ti4O9, g-C3N4 and UiO-66 has obviously reinforced activity of performing photocatalytic degradation on organic dye under visible light under the effect of compound promoted photogenerated charge separation, and has wide application prospect in the field of photocatalysis.

The invention discloses a composite photocatalyst for hydrogen production by hydrolysis in a visible light and a method for preparing the composite photocatalyst, relates to the composite photocatalyst for the hydrogen production by the hydrolysis and the method for preparing the composite photocatalyst, and solves the technical problems of poor stability of the conventional photocatalyst for thehydrogen production by the hydrolysis in the visible light, low hydrogen-producing speed rate and wide spectral response range. The composite photocatalyst is prepared by Zn(Ac)2.2H2O, Cd(Ac)2.2H2O, a rare earth compound and thioacetamide. The method comprises the following steps of: adding the Zn(Ac)2.2H2O, the Cd(Ac)2.2H2O and the rare earth compound into a solvent, and stirring at the temperature of 60 to 80 DEG C; adding the thioacetamide, continuously stirring to obtain a mixture, and adding the mixture into a reaction kettle for reaction; and cooling, washing and drying to obtain the composite photocatalyst. The hydrogen-producing speed rate of the composite photocatalyst is 360 to 640 mmol.h<-1>.g<-1>. The composite photocatalyst can be applied to hydrogen production by solar hydrolysis.

The invention relates to a carbon-doped ultrathin bismuth tungstate nanosheet photocatalytic material and a preparation method thereof. The modified carbon-doped ultrathin bismuth tungstate nanosheet photocatalytic material is characterized by being doped with carbon and prepared by piling ultrathin flaky bismuth tungstate nanosheets bent and agglomerated to some degree. The novel visible-light responsive carbon-doped ultrathin bismuth tungstate nanosheet photocatalytic material is of a flaky structure, has more active sites and large specific surface area, excellent CO2 capturing capability and visible-light response and charge transfer capability and low photoproduced electron-hole pair compounding efficiency, the solar energy utilization rate is greatly improved, the material is used for photocatalytic reduction of CO2, and the photocatalytic reduction activity of the CO2 can be obviously improved.

The invention belongs to the field of covalent organic framework materials, and particularly relates to a thioether functionalized pyrenyl covalent organic framework material and a preparation method and application thereof. The preparation method comprises the following steps: adding 2, 5-bis (2-(ethylthio) ethoxy) terephthalylhydrazine and 1, 3, 6, 8-4-(p-formylphenyl)-pyrene into a solvent system, and reacting to obtain the thioether functionalized pyrenyl covalent organic framework material. Equipment and chemical reagents used in the synthesis method are easy to obtain, the process operation is simple and convenient, the applicability is high, the industrial application value is high, the synthesis yield is relatively high, and the pyrenyl covalent organic framework material prepared by the method has good response to visible light, has good potential application value in the field of hydrogen production by photocatalytic decomposition of water, and is easy to popularize and utilize.

The invention discloses a preparation method of a MoS2 nano-sheet coated KNbO3 nano-wire piezoelectric / photocatalytic material, belonging to the field of photocatalysis. The preparation method of a MoS2 nano-sheet coated KNbO3 nano-wire piezoelectric / photocatalytic material uses niobium powder (Nb), potassium hydroxide (KOH), sodium molybdate (Na2MoO4.2H2O) and thiourea (CN2H4S) as raw materials,and adopts a simple two-step hydrothermal method to prepare the KNbO3 / MoS2 heterostructure piezoelectric / photocatalytic material with good crystallinity. The two-step hydrothermal method is characterized in that KNbO3 nanowires are synthesized through a first hydrothermal reaction, and KNbO3 / MoS2 heterostructure piezoelectric / photocatalytic materials are synthesized through a second hydrothermal reaction. The preparation method provided by the invention is simple, and the experimental conditions are easy to control, and the piezoelectric / ferroelectric characteristics are innovatively utilized,and the photocatalytic performance is maximally optimized by promoting the separation of photo-generated electrons and holes. The significantly improved catalytic performance is due to the synergistic effect of heterostructures and the effect of mechanical vibration induced built-in electric fields to promote charge separation.

The invention discloses a preparation method of a MoSe2 nanosheet coated KNbO3 nanowire heterostructure photocatalytic material, and belongs to the field of photocatalysis. According to the invention,niobium powder (Nb), potassium hydroxide (KOH), sodium molybdate (Na2MoO4.2H2O) and selenium powder (Se) are used as raw materials, and a KNbO3 / MoSe2 heterostructure photocatalytic material with goodcrystallinity is prepared through a simple hydrothermal method and a solvothermal method. The hydrothermal method is used for synthesizing KNbO3 nanowires, and the solvothermal method is used for synthesizing the KNbO3 / MoSe2 heterostructure photocatalytic material. The preparation method is simple, the experimental conditions are easy to control, and the KNbO3 / MoSe2 heterostructure photocatalyticmaterial is synthesized for the first time. The significantly improved photocatalytic performance is due to the synergistic effect of the heterostructure and the effect of promotion of charge separation by the built-in electric field generated by the spontaneous polarization of a ferroelectric.

The invention relates to a preparation method of a yttrium zirconate ceramic glaze material having a photocatalytic function. The preparation method comprises the following steps: preparing quartz, potash feldspar, albite, borax, Y2O3, Suzhou clay and lithium carbonate, keeping the temperature at 1270-1290 DEG C for 20-40 minutes, taking out, pouring into water, quenching to prepare a fusion cake, and grinding the fusion cake to obtain a material A; preparing the material A, Y2O3, ZrO2 and Suzhou clay, and grinding to obtain a material B; adding the material B and dispersing agent into water, and uniformly stirring and mixing to prepare a glaze slip; and applying the glaze slip to the surface of ceramics in a glaze spray manner, and firing to obtain the yttrium zirconate ceramic glaze material having a photocatalytic function. According to the invention, the ceramic glaze is prepared through a firing process and does not need coating, so that the prepared functional ceramic glaze material can be tightly combined with a ceramic matrix; and the photocatalyst yttrium zirconate generated in the sintering process of Y2O3 and ZrO2 is uniformly distributed in the glaze material, thereby avoiding influencing the aesthetic property of the glaze material due to a rainbow effect.

The invention discloses a preparation method for a bismuth tungstate film. The preparation method comprises the following steps: putting a substrate into a reaction solution, and performing hydrothermal reaction to form the bismuth tungstate film on the surface of the substrate, wherein the substrate is a tungsten plate or a substrate with a tungsten layer on the surface; the reaction solution is an acid solution containing bismuth ions. The preparation method is simple in process, easy to operate, low in cost and environment-friendly; the prepared bismuth tungstate film has the advantages of being uniform, good in adhesion, good in visible light response, high in photoelectric performance and the like.

The invention discloses a graphite phase carbon nitride photocatalyst prepared by using biuret as a precursor material, wherein biuret is directly calcined for 2-4 h at a temperature of more than 500-600 DEGC in an argon atmosphere or a nitrogen atmosphere to obtain the novel graphite phase carbon nitride. According to the present invention, the graphite phase carbon nitride is successfully prepared by firstly using the material biuret, and has advantages of strong light absorption capability, good visible light response, large specific surface area and rich light catalytic hydrogen productionactive sites; after light reduced platinum loading, the graphite phase carbon nitride prepared from biuret has good visible light catalytic hydrogen production activity compared with the graphite phase carbon nitride prepared from other precursor materials, wherein the visible light catalytic hydrogen production rate reaches 7026 [mu]mol / h / gcat, the quantum efficiency at 425 nm is 10.8%, and thehydrogen production stability is good; and the method has characteristics of simple operation and good repeatability, and provides a reliable scheme in the improvement of photocatalytic decompositionwater-to-hydrogen efficiency and the development and applications of graphite phase carbon nitride.

The invention discloses a double-electrode photoelectrochemical aptamer sensor as well as a preparation method and application thereof. The sensor comprises a first conductive glass electrode modified by a ternary composite material and used as a working electrode, a specific aptamer probe used as a counter electrode, and a second conductive glass electrode modified by reduced graphene oxide loaded with gold nanoparticles. The preparation method comprises the steps of preparing the working electrode and the counter electrode. The dual-electrode photoelectrochemical aptamer sensor has the advantages of high stability, long service life, strong anti-interference capability, high detection sensitivity, wide detection range, low detection limit and the like, can realize specific detection of pollutants (such as antibiotics) in media such as water bodies and organisms, and is high in utilization rate, high in use value and good in application prospect; and meanwhile, the preparation method has the advantages of simple process, convenience in operation, safety, low cost, no pollution, high preparation efficiency and the like, is suitable for large-scale preparation and is beneficial to industrial application.

The invention provides a titanium dioxide film electrode and a preparation method and application. The method comprises the steps: FTO conductive glass is immersed in a mixed solution obtained by mixing antimony trichloride, tetrabutyl titanate and a hydrochloric acid solution, and a reaction is conducted for 4-8 h at the temperature of 150-180 DEG C; and after cooling, washing and drying, heat treatment at 400-500 DEG C for 2-6 hours is conducted to obtain a titanium dioxide film electrode. The titanium dioxide film electrode and a monocrystalline silicon battery piece are combined to obtaina photo-anode. An anode of the photocell is a photo-anode, a cathode of the photocell is a platinum electrode, an electrolyte of the photocell is a sodium sulfate aqueous solution, and the photocell can be used for degrading organic matters in water. The titanium dioxide film electrode provided by the invention has good visible light response and photocatalytic performance, can effectively inhibitthe recombination of photon-generated carriers, and promotes the separation of photo-generated electrons and holes. The photo-anode provided by the invention can be used for degrading organic mattersin water under the irradiation of sunlight, and can simultaneously generate hydrogen without additionally providing voltage.

The invention provides a CuO base composite material and a preparation method thereof. Since CQDs (Carbon Quantum Dots) have excellent electron storage ability and upconversion fluorescence property and can form water solubility protection on the surface of the material, a CuO nanometer structure can be prevented from conglobation in a preparation process; the CuO has an excellent electron transmission property and visible-light response, CQDs aqueous solution is used for carrying out product post-processing, and a stable CQDs protection and fluorescence conversion layer is formed on the surface of the CuO and is also favorable for improving the current carrier separation and transmission of the composite material in a light-catalyzed reaction process and reducing the recombination rate after the current carrier is separated; in addition, the pi-pi mutual action between the conjugated structure of the CQDs between benzene is favorable for enriching benzene on the surface of the composite material, two ingredients are cooperated to efficiently degrade organic gas pollutants (the degradation efficiency of benzene can be 93%) under visible light.

The invention belongs to the technical field of photocatalysis, and particularly discloses a ZnIn2S4 / MQDs composite photocatalyst as well as a preparation method and application thereof. The ZnIn2S4 / MQDs composite photocatalyst is prepared from the following components in percentage by mass: 1 to 4 percent of MXene quantum dots and 96 to 99 percent of ZnIn2S4. According to the invention, ZnIn2S4 is modified by using an electronic auxiliary agent MXene QDs, and abundant active sites are provided for hydrogen evolution reaction. The preparation method provided by the invention is simple in process, and the prepared composite photocatalyst has very high efficiency of catalytically cracking water to produce hydrogen when no noble metal is used as a cocatalyst, is high in photocatalytic activity, low in cost and pollution-free, can be recycled, and is high in application and popularization performance.

The invention relates to a composite material of bimetallic oxide quantum dots and carbon nitride nano sheets. The composite material comprises continuous-phase carbon nitride nano sheets, dispersed-phase copper oxide quantum dots and iron oxide quantum dots. The structure has large specific surface area and defects, more active sites can be provided for photo-Fenton catalysis, and the activity of Fenton reaction is improved. In the composite material of the bimetallic oxide quantum dots and the carbon nitride nano sheets, the ultra-thin carbon nitride nano sheets have a large amount of nitrogen coordination, the carbon nitride nano sheets are used as carriers, the copper-iron oxide quantum dots can be effectively anchored, agglomeration among metal nano particles is prevented, Fe (III) / Fe (II) conversion is promoted, and meanwhile, Fe<3+> is used as an electron acceptor, and the compounding of photo-induced electron-hole pairs in the carbon nitride nano sheets can be inhibited, so that the efficiency of photo-Fenton oxidation degradation of organic pollutant tetracycline is improved, and the defects in the prior art are overcome.

The invention discloses a preparation method of a 0D / 3D Fe2O3 QDs / g-C3N4 hybrid photo-Fenton catalyst. The method comprises the following steps: by taking melamine and cyanuric acid as raw materials, preparing g-C3N4 with a three-dimensional porous structure by adopting a one-step calcination method; and mixing three-dimensional g-C3N4, FeCl3. 6H2O and NH4HCO3 according to a proper ratio, and carrying out simple self-assembly to synthesize the Fe2O3 QDs / g-C3N4 photo-Fenton catalyst. The catalyst has good visible light response, excellent harmful pollutant degradation capacity and recycling stability, and has a wider working range compared with a classical photo-Fenton catalyst; and the preparation method is simple in process, low in raw material cost and easy for large-scale production.

The invention discloses a preparation method of a defect-rich three-dimensional cross-linked g-C3N4 hybridized two-dimensional Ti3C2 MXene photocatalyst, which comprises the following steps: taking melamine and cyanuric acid as precursors to obtain a three-dimensional porous structure catalyst, and preparing a three-dimensional cross-linked g-C3N4 sample by adopting a one-step calcination method; then uniformly mixing the three-dimensional cross-linked g-C3N4 with sodium borohydride, and performing drying and annealing treatment to obtain a defect-rich three-dimensional cross-linked g-C3N4 sample; then, the g-C3N4 / Ti3C2 Schottky heterojunction catalyst is protonated and hybridized with a two-dimensional MXene nanosheet, and the g-C3N4 / Ti3C2 Schottky heterojunction catalyst is prepared; the catalyst has a relatively large specific surface area and good photogenerated charge migration efficiency, and shows excellent and stable organic pollutant photocatalytic degradation and hydrogen production performance under visible light.

The invention relates to an indium-based sulfide composite photocatalyst and a preparation method thereof, and is used for solving the technical problem that the existing trinary indium-based sulfide has low hydrogen yield. The indium-based sulfide composite photocatalyst is prepared from cadmium salt, zinc salt, indium salt and sulfur source compounds by a one-step hydrothermal method. The method comprises the following steps of: adding the cadmium salt and the zinc salt to indium salt aqueous solution, stirring until the solution is transparent, adding the sulfur source compound, and stirring to obtain a mixed solution; and transferring the mixed solution to a reaction kettle, maintaining the temperature at 90-140 DEG C for 6-24 hours, cooling, washing and drying to obtain the indium-based sulfide composite photocatalyst. The photocatalyst has hydrogen yield of 32000-37000 mu mol.h<-1>.g<-1> under irradiation of light with wavelength lambda more than 400 nm, has good cycle performance, and can be used for hydrogen preparation based on photocatalytic hydrolysis.

The invention discloses a C-TiO2 / g-C3N4 composite photocatalytic material and a synthesis method thereof.The synthesis method comprises the following steps that 1, biomass serves as a carbon source, tetrabutyl titanate serves as a titanium source, and a C-TiO2 material is prepared through a hydrothermal reaction method; (2) putting melamine into a tubular furnace for sintering, and crushing a solid obtained after sintering, so as to prepare a g-C3N4 material; and (3) mixing the C-TiO2 material and the g-C3N4 material, fully grinding, and calcining the ground mixed powder in a tubular furnace to obtain the calcined powder, namely the C-TiO2 / g-C3N4 composite photocatalytic material. The composite photocatalytic material has heterojunction with matched energy levels, shows better visible light response, and has higher degradation efficiency on methylene blue and tetracycline hydrochloride under visible light.

The invention belongs to the technical field of photocatalysis, and particularly relates to a preparation method for a visible light ternary photocatalyst. The preparation method comprises the following steps: step 1, adding tetrabutyl titanate into absolute ethyl alcohol, and ultrasonically stirring for 30-60 minutes to obtain a titanate alcohol solution; step 2, slowly dropwise adding ethyl silicate into the titanate alcohol solution, mechanically stirring until completely dissolving to obtain a titanium-silicon mixed alcohol solution; step 3, adding a dispersing agent into ionized water toform dispersion liquid, and slowly adding the dispersion liquid into titanium-silicon alcohol solution to obtain titanium-silicon dispersion liquid; step 4, putting graphene into the titanium-silicondispersion liquid, and performing cyclic ultrasonic reaction for 4-6 hours, thereby obtaining the ternary mixed solution; step 5, putting the ternary mixed solution into a decompression distillation reaction kettle to perform decompression distillation reaction for 60-90 minutes, thereby obtaining a viscous solution; and step 6, putting the thick solution into a drying oven to dry for 30-50 minutes, and heating and sintering for 20-40 minutes, thereby obtaining the ternary photocatalyst. The preparation method solves the problem that performance, in a visible light region, of a graphene-titanium dioxide catalyst is not good; and the prepared photocatalyst is high in stability and photodegradation efficiency.

The invention discloses a fiber filter felt for photocatalytic sewage treatment and a preparation method of the fiber filter felt. The photocatalytic fiber filter felt is prepared from glass fibers serving as a base material and a photocatalytic material serving as a coated layer; the photocatalytic material adopts a mixed modified photocatalyst. The fiber felt prepared through the preparation method has the characteristics of small wind resistance, high light transmittance and the like, has good visible light response and is excellent in photocatalytic degradability.

The invention discloses a heterostructure catalyst for decomposing water into hydrogen by utilizing solar energy and a preparation method of the catalyst, and belongs to a preparation method of a semiconductor photocatalytic material. The preparation method comprises the following steps: 1) dispersing SiO2 nanospheres into deionized water, adding urea and nickel nitrate, and uniformly conducting mixing; 2) transferring the mixed solution into a hydrothermal reaction kettle, and conducting reacting at 105 DEG C for 12 hours; (3) after natural cooling, centrifuging a product, and drying the product to obtain SiO2-coated nickel silicate powder; (4) dispersing the SiO2-coated nickel silicate into deionized water, adding sodium sulfide, and adjusting the pH of a mixed solution by using NaOH; 5) transferring the mixed solution into a hydrothermal reaction kettle, and conducting reacting at 160 DEG C for 12-20 hours; 6) after natural cooling, centrifugally collecting black precipitates, and performing vacuum drying to obtain NiS hollow nanosphere powder; 7) dissolving NiS and glycerin in water, and adding zinc chloride, indium chloride and thioacetamide; 8) reacting the solution for 2 hours at 80 DEG C in a stirring state; and 9) carrying out centrifugation, washing and drying to obtain NiS-coated ZnIn2S4. The NiS-coated ZnIn2S4 spherical heterostructure has the advantages of large specific surface area, low density, good surface permeability and visible light response.

The invention discloses a preparation method and application for a morphology-controlled CdSe-modified porous TiO2 material. The preparation method comprises the following steps: Step I: synthesizingmonodisperse polystyrene microspheres (PS) with an average diameter of 500 nm; Step II: preparing CdO-TiO2 intermediate: preparing CdO-TiO2 intermediate by using the polystyrene microspheres obtainedin Step I) as a template in a sol-gel method; Step III: preparing nanosheets, nanorods and nano-conical CdSe particle-modified porous TiO2 photocatalyst in a two-step method. By means of the material,optically stimulated electrons can be transferred from a conduction band of CdSe to a conduction band of TiO2, the porous structure also improves active sites of the reaction, and the hydrogen production activity is improved. The growth-controlled composite material designed based on a reasonable material can obtain very good hydrogen evolution speed under visible light without any precious metalas a promoter.

The invention belongs to the technical field of an LED photoelectric industry, and provides a long-service-life LED substrate and a preparation method thereof. The preparation method comprises the steps of firstly sintering under a low-temperature condition to obtain an aluminum oxide / silicon carbide composite ceramic plate, then preparing a polystyrene microsphere dispersion emulsion to obtain composite microspheres of titanium dioxide and polystyrene under a certain condition, finally coating the aluminum oxide / silicon carbide composite ceramic plate with the obtained composite microspheres,and adding an aluminum nitride heat dissipating plate on the aluminum oxide / silicon carbide composite ceramic plate so as to obtain an LED substrate which has good heat dissipation, heat shock resistance and corrosion resistance and is long in service life. The LED substrate prepared according to the method has good heat dissipation, heat shock resistance and corrosion resistance, is good in response for visible light with a long wave length and long in service life, and has the advantages of deodorization, bacteria resistance, pollution prevention, good stability, ability of being non-poisonous, low cost and the like. Meanwhile, the LED substrate is simple to operate, low in sintering temperature and easy to popularize and perform scale production.

The invention discloses a preparation method of an AgBr / Ag2CrO4 n-n hetero-junction composite photocatalyst. The preparation method comprises steps as follows: firstly, Na2CrO4.4H2O is added to deionized water under the dark condition, and a solution A is formed; AgNO3 is added to the deionized water, and a solution B is formed; the solution B is dropwise added to the solution A, a mixed solutionis formed, continuously stirred and then left to stand, an obtained product is subjected to suction filtration, washing is repeated with ethanol and deionized water, and a product Ag2CrO4 is obtainedby drying; under the dark condition, the product Ag2CrO4 is dispersed in the deionized water, a dispersion liquid of Ag2CrO4 is obtained, a KBr solution is prepared, the KBr solution is dropwise addedto the dispersion liquid of Ag2CrO4, stirred and left to stand, an obtained product is washed repeatedly with absolute ethanol and the deionized water and dried, and the AgBr / Ag2CrO4 n-n hetero-junction composite photocatalyst is obtained. According to the preparation method, an n-n hetero-junction is constructed between AgBr and Ag2CrO4, so that composite annihilation of carriers can be effectively prevented, and activity of the composited AgBr / Ag2CrO4 photocatalyst is obviously better than that of AgBr and Ag2CrO4.

The invention discloses a preparation method of bismuth zirconate microcrystalline ceramic glaze with a photocatalysis function. The preparation method comprises the following steps: blending quartz, potassium feldspar, albite, borax, Bi2O3, Suzhou soil and lithium carbonate; preserving heat at 1,270-1,290 DEG C for 20-40min; taking out and pouring into water for quenching to obtain a frit; grinding the frit to obtain a material A; blending the material A with Bi2O3, ZrO2 and Suzhou soil to obtain a material B; adding the material B and a dispersing agent into water, stirring and uniformly mixing to obtain glaze slip; glazing the ceramic surface with the glaze slip; and firing to obtain a bismuth zirconate ceramic glaze with a photocatalysis function. The glaze prepared According to the invention has good gloss and stable chemical property. According to the invention, the ceramic glaze is prepared by adopting a firing technology, coating is not needed, and thus the prepared functional ceramic glaze is tightly combined with a ceramic base and does not fall off easily; and moreover, crystal flowers of special morphology can be quickly formed on the glaze surface, and the surface decoration effect is good.

The invention discloses a modified carbon nitride and tungsten oxide coupled p-n type heterojunction composite material and a preparation method and application thereof in preparation of a photocatalytic bactericide. The preparation method comprises the following steps: uniformly mixing melamine, triaminoimine and tungstic acid, and performing calcining at 500-550 DEG C in an inert atmosphere for1-6 hours to obtain the modified carbon nitride and tungsten oxide coupled p-n type heterojunction composite material. The invention also discloses a photocatalytic sterilization method of E.Coli-containing wastewater, which comprises the following steps: adding the modified carbon nitride and tungsten oxide coupled p-n type heterojunction composite material into the E.Coli-containing wastewater,carrying out dark reaction adsorption equilibrium, and carrying out visible light irradiation to carry out photocatalytic sterilization.

The invention belongs to the technical field of photocatalytic materials, and discloses a 4-phenoxyphenol doped carbon nitride photocatalyst and a preparation method and application thereof. The photocatalyst is prepared by the following steps: respectively dispersing dicyandiamide and 4-phenoxyphenol into absolute ethyl alcohol, mixing, magnetically stirring and ultrasonically treating at room temperature, then magnetically stirring, heating and evaporating to dryness at 60-80 DEG C, putting the obtained solid into a muffle furnace, calcining at 540-550 DEG C at a heating rate of 5-6 DEG C / min, cooling to room temperature, and grinding with an agate mortar to obtain a series of PCN catalysts. The preparation method adopts a thermal polymerization method, is simple in synthesis process andgood in repeatability, and has basic conditions for large-scale production. The PCN 0.07 catalyst provided by the invention has good catalytic performance, and the PCN 0.07 catalyst can degrade IDM under the light of different light sources.

The invention discloses a preparation method of a Bi2Te3 / Bi2O3 / TiO2 ternary heterojunction film. The preparation method comprises the following steps: first, preparing a titanium dioxide (TiO2) nano film on the surface of a titanium plate by means of an anodic oxidation method; and then preparing a bismuth telluride / bismuth oxide binary nano composite material (Bi2Te3 / Bi2O3) on the surface of theTiO2 nano film by means of a one-step constant potential deposition method to obtain the Bi2Te3 / Bi2O3 / TiO2 ternary heterojunction film. X-ray diffraction verifies that the heterojunction film containsthree semiconductor substances: Bi2Te3, Bi2O3 and TiO2. A scanning electron microscope result shows that the Bi2Te3 / Bi2O3 / TiO2 ternary heterojunction film is composed of a Bi2Te3 / Bi2O3 nanoflower anda TiO2 nanotube. An ultraviolet visible diffuse reflection absorption spectrum illustrates that the optical absorption properties of the Bi2Te3 / Bi2O3 / TiO2 ternary heterojunction film in an ultraviolet visible light range are superior to those of pure TiO2. By applying the Bi2Te3 / Bi2O3 / TiO2 ternary heterojunction film to photo-produced cathode protection of Q235 carbon steel, the cathode of the Q235 carbon steel can be polarized to below -812 mV, which illustrates that the Q235 carbon steel enters a very good cathodic protection state.