95 results about "Bismuth vanadate" patented technology

The invention discloses a high-weather-resistance bismuth vanadate coating and a preparation method thereof, and belongs to the technical field of inorganic pigment modification. The high-weather-resistance bismuth vanadate coating comprises bismuth vanadate matrix particles, and the surfaces of the bismuth vanadate matrix particles are sequentially coated with an amorphous aluminum oxide layer, a cerium oxide layer and a fluorinated silicon oxide layer. The amorphous aluminum oxide layer is formed in an atomic layer deposition mode; the cerium oxide layer is formed by hydrothermal treatment of a cerium source. The preparation technology has accurate and controllable technological parameters, is suitable for industrial production, can replace the traditional toxic pigment containing lead and cadmium, and meets the requirements of environmental regulations. The bismuth vanadate coating has excellent weather resistance and chemical stability, the service life of a product can be prolonged, the maintenance cost is reduced, and a reliable solution is provided for development of high-performance environment-friendly pigments.

The invention relates to the field of coatings, and discloses a high-chroma corrosion-resistant yellow coating and a preparation method thereof. The coating is prepared from the following components in parts by weight: 50 to 60 parts of waterborne epoxy modified organic silicon resin, 25 to 35 parts of modified bismuth vanadate, 1 to 2 parts of nano cellulose, 0.3 to 0.8 part of dispersing agent, 0.2 to 0.5 part of defoaming agent, 0.2 to 0.5 part of flatting agent and 2 to 3 parts of corrosion inhibition pigment. The formula system of the high-chroma corrosion-resistant yellow coating is innovative, a waterborne epoxy modified organic silicon resin-modified bismuth vanadate-nanocellulose ternary synergistic system is constructed, and the high-chroma corrosion-resistant yellow coating has excellent chroma and corrosion resistance. According to the coating, flaky bismuth vanadate generated through microwave method induction is adopted, lattice defects are few, chromaticity is broken through, and high corrosion resistance is achieved.

The application provides a surface fluorine-modified bismuth vanadate photoelectrode and a preparation method and application thereof. Fluorine atoms are attached to the surface of the bismuth vanadate, and part of the fluorine atoms replace the two-coordinated oxygen atoms on the surface of the bismuth vanadate, namely the surface fluorine-modified bismuth vanadate photoelectrode. The surface fluorine-modified bismuth vanadate photoelectrode greatly improves the oxidation rate and molecular reaction efficiency of hydroxyl radicals generated by photoelectrolysis of water, effectively improves the glycerol oxidation efficiency, the selectivity of the product formic acid, and reduces the energy consumption of the reaction.

The invention provides a cobalt tungstate and bismuth vanadate photocatalytic material as well as a preparation method and application thereof, and belongs to the technical field of material synthesis and photocatalytic application. In the presence of monoclinic-phase decahedron BiVO4, CoWO4 nanoparticles grow in situ on an electron-rich (010) crystal face of the CoWO4 nanoparticles through a hydrothermal reaction, and the cobalt tungstate and bismuth vanadate photocatalytic material is obtained. According to the cobalt tungstate and bismuth vanadate photocatalytic material, a simple hydrothermal method is adopted, in the synthesis process, a CoWO4 precursor is guided by electrostatic interaction, preferentially adsorbed and subjected to nucleation growth on the (010) crystal face of BiVO4, a compact chemical bonding interface is constructed through selective growth, the charge migration distance is effectively shortened, and the photocatalytic performance of the material is improved. The interface charge transfer resistance is reduced to the greatest extent, and the formed binary photocatalyst has excellent effects on photocatalytic hydrogen evolution and tetracycline degradation.

The invention discloses a copper oxide modified bismuth vanadate photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic reduction of carbon dioxide. The method comprises the following steps: synthesizing a BiVO4 monomer through a hydrothermal method, then mixing and stirring the BiVO4 monomer and a Cu-MOF precursor solution, carrying out electrostatic adsorption compounding, then carrying out calcination treatment to convert Cu-MOF into CuO, loading the CuO on the surface of BiVO4, forming a p-n heterojunction, and preparing the CuO / BiVO4 composite photocatalyst. According to the catalyst, separation of photon-generated carriers is effectively promoted by constructing a heterojunction, the CO2 adsorption and activation capacity is enhanced, and the CO2 photocatalytic reduction performance is remarkably improved; experiments show that the CO yield of the prepared catalyst reaches 36.77 [mu] mol.g <-1 >. H <-1 > in a reaction for 5 hours, which is about 5.7 times that of pure BiVO4, and the catalyst has good stability; the method is simple in process, low in cost and suitable for efficient photocatalytic reduction of CO2 to prepare fuel.

The invention provides a preparation method and application of a fabric-based composite photocatalytic material, and belongs to the technical field of functional textiles. The preparation method comprises the following steps: mixing titanium carbide with bismuth vanadate and stannic oxide, carrying out ultrasonic treatment, sequentially adding waterborne polyurethane and a cotton fabric, reacting, and drying to obtain the fabric-based composite photocatalytic material. The bismuth vanadate / tin dioxide / titanium carbide (MXene) composite material prepared by a water bath method is prepared by taking waterborne polyurethane as a cross-linking agent and loading a catalyst onto a cotton fabric through multiple times of water bath oscillation, and has excellent photocatalytic performance and recoverability. The fabric-based composite photocatalytic material provided by the invention solves the key problems of insufficient catalytic efficiency, difficult recovery and the like of a bismuth vanadate single-phase material and a binary composite material.

The invention discloses a mixed valence copper doped bismuth vanadate nanodisk photocatalyst and a preparation method and application thereof, a main body of the catalyst is a bismuth vanadate nanodisk, copper is doped in the bismuth vanadate nanodisk, and the copper is composed of Cu < + > and Cu < 2 + >; the catalyst has the characteristics of high stability, simplicity in implementation, high universality and the like. The doped copper ions not only can improve the light absorption capacity of the bismuth vanadate material, but also can promote the rapid separation of photo-induced electrons and holes of the bismuth vanadate material by virtue of the mixed valence state of the copper ions, and improve the carrier dynamics on the material, so that the photocatalytic efficiency of the bismuth vanadate material is improved. The bismuth vanadate photocatalyst doped with the copper ions in the mixed valence state has an efficient photocatalytic degradation effect on pollutants such as rhodamine B and the like, and has a wide application prospect in the technical aspects of environmental pollutant degradation and green advanced oxidation.

The application belongs to the field of ceramic ink, and discloses a concave engraving ceramic ink with obvious line effect and no background color and application thereof. The first part of the ink contains bismuth vanadate, and the second part contains hydrated magnesium silicate and / or fumed silica. The inventor finds that the finer the particle size of the bismuth vanadate, the lighter the background color after firing, and the specific surface area of the hydrated magnesium silicate and / or fumed silica is relatively large, which can be well combined with the bismuth vanadate to form a glass phase to dissolve the background color formed by vanadium elements in a high-temperature molten state. After the hydrated magnesium silicate and / or fumed silica is ground, the ceramic ink with a more hydrophobic enamel stripping effect can be formed. The first part makes the glaze surface form a concave effect, and the second part has a hydrophobic and enamel-repellent effect, and the two mechanisms jointly act to achieve the effect of obvious line effect and no background color. The concave engraving ceramic ink has excellent printing performance, and the concave line effect of the ceramic tile is obvious and has no background color.

The application discloses a preparation method of a bismuth vanadate / alumina foam ceramic composite photocatalytic material, and comprises the following steps: S1, washing a substrate material, and then pretreating the substrate material to obtain a pretreated substrate; S2, mixing water, ethanol and ethylene glycol to obtain a mixed solution A for standby; S3, dissolving soluble vanadium salt, soluble bismuth salt and a doped element in the mixed solution A, and continuously stirring until the soluble vanadium salt, the soluble bismuth salt and the doped element are dissolved to obtain a mixed solution B; S4, repeatedly immersing the pretreated substrate in the mixed solution B, and sufficiently drying the pretreated substrate after the immersion to obtain an immersed substrate material; and S5, sintering the immersed substrate material in a sintering device, and then taking out the immersed substrate material after the immersed substrate material is naturally cooled to room temperature to obtain the bismuth vanadate / alumina foam ceramic composite photocatalytic material. The process flow of the application is simple, raw materials used are simple and easy to obtain, the operation difficulty of a preparation process is moderate, controllability is good, synthesis conditions are easy to control, and the application has strong operability and practicability.

The invention relates to the technical field of photocatalysis, in particular to a strontium bismuth vanadium oxide photocatalyst and a preparation method and application thereof.The chemical formula of the photocatalyst is Sr3. 59Bi19.41 V4O42, the crystal structure of the photocatalyst belongs to an orthorhombic system, the space group of the photocatalyst is Immm, and the photocatalyst is of a unique layered structure composed of cation triple plate layers; the photocatalyst is synthesized by a molten salt method, and shows the activity of photocatalytic decomposition of water to produce oxygen under visible light. The preparation method comprises the following steps: mixing and grinding SrO, Bi2O3 and VO precursors with a molten salt medium, and then carrying out temperature programming calcination to synthesize a target product; the catalyst prepared by the method has the characteristics of high crystallinity, few defects and regular morphology, the photocatalytic oxygen production performance of the catalyst is remarkably superior to that of a same-component sample synthesized by a traditional solid-phase method, and photocatalytic water decomposition and oxygen production can be realized by taking a silver nitrate, ferric nitrate, ferric chloride or potassium ferricyanide aqueous solution as a sacrificial agent system under the irradiation of visible light with the wavelength of more than or equal to 420 nm.

The invention provides a copper-doped cadmium zinc sulfide / chromium-doped bismuth vanadate hollow sphere composite photocatalyst, a preparation method thereof and application of the photocatalyst in hydrogen production by water decomposition. The material is prepared by the following method: (1) preparing copper-doped zinc cadmium sulfide nanoparticles by using a hydrothermal method; (2) preparing chromium-doped bismuth vanadate hollow spheres by using a hydrothermal method; and (3) modifying the copper-doped cadmium zinc sulfide on the surface of the chromium-doped bismuth vanadate hollow sphere to obtain the copper-doped cadmium zinc sulfide / chromium-doped bismuth vanadate hollow sphere composite photocatalyst. The copper-doped cadmium zinc sulfide / chromium-doped bismuth vanadate hollow sphere composite photocatalyst prepared by the invention is easy to synthesize, wide in raw material source and high in catalytic activity and stability, and in a photocatalytic hydrogen production test, the photocatalytic hydrogen production amount within 3 hours can reach 49.1 mmol.g <-1 >.

The invention discloses an antibacterial and deodorant plastic composite material applied to pet carts and a preparation method of the antibacterial and deodorant plastic composite material. The composite material comprises a thermoplastic resin matrix, a composite inorganic antibacterial deodorant, a compatible dispersant, an antioxidant, a light stabilizer and a processing aid, the preparation method comprises the steps that silver-doped porous spherical bismuth vanadate powder / nano cerium oxide is synthesized to serve as an inorganic antibacterial deodorant, then the inorganic antibacterial deodorant and other components are subjected to melt blending, the porous structure of the inorganic antibacterial deodorant can efficiently adsorb peculiar smell molecules, silver ions are slowly released from deep pore channels, the material can still keep activity in a weak light environment, and the material has a good antibacterial effect. The BiVO4 / CeO2 composite photocatalyst has the advantages that the BiVO4 / CeO2 composite photocatalyst is prepared by the aid of the BiVO4 / CeO2 composite photocatalyst, accordingly, long-acting and lasting antibacterial effects can be realized, defect energy levels can be introduced by doping Ag in BiVO4 crystal lattices, heterojunction can be formed between Ag-doped BiVO4 and CeO2, effective spatial separation of photo-induced electrons and holes can be realized, sufficient active oxygen species can be generated, and efficient and broad-spectrum antibacterial effects can be realized.

The application discloses a kind of bismuth-doped carbon nitride photocatalyst and its preparation method and application in NADH regeneration, comprising the following steps: bismuth salt is dissolved with vanadate in concentrated nitric acid, then deionized water is added, and bismuth vanadate precursor solution is formed by stirring violently;Vanadium bismuth precursor solution is transferred to microwave synthesis instrument to carry out microwave synthesis to obtain bismuth vanadate;Synthesized bismuth vanadate and carbon-nitrogen precursor are transferred to porcelain boat, put into tube furnace, slowly heated and calcined under Ar atmosphere, after calcination is finished, the obtained solid product is ground into powder for standby;The obtained powder is added to anhydrous ethanol, washed several times, then centrifugal separation solid, after drying, it is the bismuth-doped carbon nitride photocatalyst prepared.The application is prepared by using the above technology, and the prepared bismuth-doped carbon nitride photocatalyst has good performance in regenerating coenzyme NADH, and has the characteristics of simple preparation method, wide raw material source, good catalytic effect, safety and environmental protection.

This invention belongs to the field of architectural ceramics, specifically disclosing a matte ultra-soft ceramic tile with a digital mold effect and its preparation method. The ceramic tile comprises, from bottom to top, a body, a base glaze layer, an intermediate glaze layer, a pattern layer, a digital micro-engraving ink layer, and a protective glaze layer. The raw materials for preparing the intermediate glaze layer, by weight, include: 20-35 parts of sodium feldspar, 5-10 parts of potassium feldspar, 5-10 parts of wollastonite, 5-15 parts of dolomite, 5-15 parts of washed clay, 5-20 parts of calcined talc, 3-8 parts of calcined kaolin, 2-5 parts of alumina, 10-20 parts of barium carbonate, 1-5 parts of calcined zinc oxide, and 2-5 parts of strontium carbonate. The raw materials for preparing the digital micro-engraving ink layer, by weight, include: 40-50 parts of inorganic materials, 3-8 parts of dispersant, and 40-60 parts of solvent; the inorganic materials contain bismuth vanadate, a low-temperature first glass powder, and a high-temperature second glass powder.

The invention discloses a method for optimizing the performance of a bismuth vanadate photo-anode by regulating and controlling the temperature of an electrolyte and application of the method, and belongs to the technical field of photoelectrochemical energy conversion. The method comprises the following steps: placing a bismuth vanadate photo-anode in an alkaline electrolyte, and controlling the temperature of the alkaline electrolyte to be 52-54 DEG C when a photoelectrocatalysis water decomposition reaction is carried out. According to the invention, the electrolyte is accurately controlled within the temperature range to carry out the photoelectrocatalytic water decomposition reaction, so that the photocurrent density, the photoelectric conversion efficiency (ABPE) and the charge transfer efficiency can be remarkably improved. According to the invention, the nonlinear influence rule of the electrolyte temperature on the charge transfer behavior of the BiVO4 / electrolyte interface is systematically disclosed for the first time, and the action mechanism is similar to that in a periodic structure, band gap optimization and energy transfer efficiency maximization are realized through parameter tuning. The method does not need to carry out complex modification on an electrode material, is simple to operate, low in cost and good in repeatability, and provides a new optimization strategy and application guidance for design and operation of a high-efficiency solar fuel conversion device.

The application discloses a carbon nitride / bismuth vanadate / UiO-66 composite photocatalyst and a preparation method and application thereof, belongs to the technical field of catalyst materials, and is characterized in that porous tubular g-C3N4, high-exposure {001} crystal surface BiVO4 and UiO-66 are compounded to construct a ternary heterojunction system with a structure synergy and a closely coupled interface. The UIO-66 is used as an electronic medium and a structure support, the separation and migration efficiency of photo-generated carriers is significantly enhanced, the visible light absorption capacity and the redox potential of the material are synergistically improved through band matching, and therefore the catalytic activity of the material is superior to that of a single or binary component in multiple reactions such as organic pollutant degradation, CO2 reduction and water splitting to produce hydrogen / oxygen. The g-C3N4 with a unique porous tubular structure and the high specific surface area of the UIO-66 together strengthen the adsorption and mass transfer process of reactants and ensure good structural stability and recycling performance of the composite material.

A method of preparing bismuth vanadate particles is described. The bismuth vanadate particles prepared via ultrasonication and hydrothermal treatment exhibit controlled morphology (e.g., octahedral shape) and crystallinity (e.g., tetragonal crystal symmetry). A photoelectrode containing bismuth vanadate particles and a method of using the photoelectrode in a photoelectrochemical cell for water splitting is also provided.

The invention belongs to the field of water treatment photocatalytic materials, and relates to a bismuth vanadate quantum dot modified multistage titanium dioxide photoelectrode and a preparation method thereof. The method comprises the following steps: depositing a titanium dioxide substrate layer on a conductive surface of conductive glass; forming a titanium dioxide nanorod array on the titanium dioxide substrate layer through a hydrothermal method; growing a titanium dioxide nano grass array on the titanium dioxide nano rod array through a hydrothermal method; and loading bismuth vanadate quantum dots to the surface of the titanium dioxide nano-grass array through a hydrothermal method to obtain the photoelectrode. The photoelectrode has the characteristics of large specific surface area, multiple active sites, strong visible light absorption, high charge separation efficiency, good stability, simplicity and convenience in preparation and no secondary pollution. All levels of structures of the photoelectrode prepared through the method are tightly combined through chemical bonds, stability is high, and the long cycle life of the electrode is guaranteed.

The application discloses a preparation method of nano-bismuth vanadate with different morphologies and application thereof. The method specifically comprises the following steps: adding an ammonium metavanadate aqueous solution into a bismuth nitrate aqueous solution, and then performing a reaction under the condition that the pH value is 5-10, so that the nano-bismuth vanadate with different morphologies is prepared. The pH value of the reaction system is simply and effectively adjusted by using sodium hydroxide lye, and other organic reagents are not needed to be added, so that the nano-bismuth vanadate obtained not only has controllable appearance and large specific surface area, but also has peroxidase-like activity, and can be used for detecting melamine in a solution.

The invention provides a preparation method and application of a near-infrared response carbon dot composite bismuth vanadate / nickel oxide heterojunction photocatalyst. According to the material, levofloxacin is taken as a precursor, nitrogen-fluorine-doped carbon dots with an up-conversion characteristic are synthesized through a hydrothermal method, and the nitrogen-fluorine-doped carbon dots are compounded with a NiO nanosheet and a BiVO4 precursor which are prepared in advance by adopting a one-step hydrothermal strategy. Due to the up-conversion characteristic of the carbon dots, near-infrared light can be converted into visible light, spectral response is widened, and light capture efficiency is improved; meanwhile, the electron transmission capability of the material is cooperated with the built-in electric field of the BiVO4 / NiO p-n heterojunction, a multi-dimensional transmission channel is constructed, and carrier recombination is inhibited, so that the generation efficiency of active oxygen is remarkably improved, and the photocatalytic material with near-infrared light response characteristics, excellent antibiotic degradation performance and high stability is finally obtained.

The invention relates to the technical field of water treatment, and discloses a water purification method for removing micro-plastics in water through photocatalysis-activated carbon synergism, which comprises the following steps: S1, preparation of functional composite particles: raw materials: activated carbon particles (the particle size is 0.5-2mm, the specific surface area is greater than or equal to 800m < 2 > / g, and the particle size is 0.5-2mm); the iodine value is greater than or equal to 1000mg / g), the photocatalyst precursor is selected from one or more of graphite phase carbon nitride g-C3N4, bismuth vanadate BiVO4 and titanium dioxide TiO2, and the transition metal salt is selected from one or more of ferric nitrate Fe (NO3) 3, copper sulfate CuSO4 and ferrous chloride FeCl2. A photocatalyst is directionally loaded on the surface of activated carbon through a silane coupling agent, a space coupling structure of'activated carbon adsorption of microplastics-photocatalyst in-situ degradation 'is formed, the microplastics are directly contacted with the photocatalyst (the contact distance is less than 10 microns) after being enriched by the activated carbon, and the problem of separation of the microplastics and the photocatalyst in a traditional mixed system is avoided.

Provided are bismuth vanadate particles containing molybdenum and having an average particle size of 5 μm or less. In the bismuth vanadate particles, it is preferable that the content of molybdenum (M1) in terms of molybdenum trioxide relative to 100 mass% of the bismuth vanadate particles, which is determined by XRF analysis of the bismuth vanadate particles, is 0.001 mass% to 10 mass%. In the bismuth vanadate particles, it is preferable that the content of molybdenum in terms of molybdenum trioxide relative to 100 mass% of the surface layer of the bismuth vanadate particles, which is determined by XPS surface analysis of the bismuth vanadate particles, is 0.1 mass% to 30 mass%.

The present invention includes an asymmetric supercapacitor that includes a negative electrode, a positive electrode, an aqueous electrolyte, and a separator. The negative electrode includes a first fluorine-doped tin oxide glass substrate having a first coated surface including a date leaves derived carbon and a first polymer. The asymmetric supercapacitor includes a positive electrode including a second fluorine-doped tin oxide glass substrate having a bismuth vanadate layer. The bismuth vanadate layer is coated with a second composition including the date leaves derived carbon and a second polymer. The separator is located between the positive electrode and the negative electrode, and the electrolyte is present in and on the separator.

The invention belongs to the technical field of photoelectric catalytic materials, and particularly relates to a transition metal oxyhydroxide modified bismuth vanadate film containing gradient oxygen vacancies and a preparation method and application thereof. The bismuth vanadate thin film comprises a bismuth vanadate thin film and a transition metal oxyhydroxide layer which is loaded on the bismuth vanadate thin film and contains gradient oxygen vacancies, the transition metal oxyhydroxide layer containing gradient oxygen vacancies is prepared by irradiating the transition metal oxyhydroxide modified bismuth vanadate film for different times in a sodium sulfite aqueous solution by taking an AM 1.5 G xenon lamp simulating sunlight as a light source. According to the transition metal oxyhydroxide modified bismuth vanadate thin film containing gradient oxygen vacancies, the oxygen evolution reaction activity is effectively improved, the light current density of the thin film is improved, the light corrosion of the thin film is relieved through efficient hole extraction, the working stability of the bismuth vanadate thin film is effectively improved, and the service life of the thin film is prolonged. The method has extremely high application value in the field of photocatalytic and photoelectrocatalytic hydrogen production.

The application discloses a BiVO4 / FeVO4 composite sono-catalyst, a preparation method and application thereof. Bi(NO3)3.5H2O and Fe(NO3)3.9H2O are taken, nitric acid solution is added for dissolution, and then NH4VO3 NaOH solution is slowly added after being uniformly mixed, the pH of the solution is adjusted, the mixed solution is uniformly stirred, and then is transferred into a reaction kettle for hydrothermal synthesis reaction, and then is cooled to room temperature, filtered, washed, dried, and calcined at high temperature in a tube furnace to obtain the BiVO4 / FeVO4 composite sono-catalyst. The composite material provided by the application can synergistically act with potassium persulfate to remove tetracycline under ultrasonic catalysis, has high removal efficiency and short reaction time. The removal rate of tetracycline under ultrasonic conditions for 120 min can reach 94.80% by using the method.

The invention provides an F and Pd modified single crystal BiVO4 photocatalyst and application of the F and Pd modified single crystal BiVO4 photocatalyst to photocatalytic degradation of glyphosate and synergistic production of H2O2. The preparation method comprises the following steps: dispersing single crystal BiVO4 powder in a deionized water solution to prepare a suspension; adding a fluoride solution into the suspension, stirring for a certain time under illumination, washing and drying to obtain a photocatalyst (BiVO4-F-110) of which F <-> is modified on a crystal face (110) of a single crystal BiVO4 enriched photohole; the preparation method comprises the following steps: dispersing BiVO4-F-110 into a methanol aqueous solution, adding a certain amount of a palladium chloride aqueous solution, continuously introducing Ar, removing O2 dissolved in a suspension, and then carrying out light treatment under a stirring condition; and after illumination is finished, washing and drying the obtained precipitate to obtain the photocatalyst. F ions are selectively modified on the hole-rich crystal face of the single crystal bismuth vanadate, so that glyphosate adsorption can be promoted, photogenerated holes can be effectively captured, the Pd-loaded (010) crystal face can effectively enhance the reduction of O2 to produce H2O2, and the synergistic interaction of pollutant degradation and H2O2 synthesis is further realized.

The application provides an F, Pd modified single crystal BiVO4 photocatalyst and an application of the photocatalyst in photocatalytic degradation of glyphosate and synergistic production of H2O2. Single crystal BiVO4 powder is dispersed in a deionized water solution to prepare a suspension; a fluoride solution is added to the suspension, and the mixture is stirred under light irradiation for a certain time, washed and dried to obtain F ‑ modified photocatalyst (BiVO4-F-110) on a (110) crystal plane of the single crystal BiVO4 which is rich in photo holes; the BiVO4-F-110 is dispersed into a methanol water solution, a certain amount of a palladium chloride water solution is added, Ar is continuously introduced, dissolved O2 in the suspension is removed, and then the mixture is treated under light irradiation under stirring; after the light irradiation, the obtained precipitate is washed and dried to obtain the photocatalyst. Selective modification of F ions on the hole-rich crystal plane of the single crystal bismuth vanadate can promote the adsorption of glyphosate and effectively capture photo-generated holes, and the Pd loading on the (010) crystal plane can effectively enhance the O2 reduction to produce H2O2, thereby realizing the synergistic effect of pollutant degradation and H2O2 synthesis.

The invention discloses a preparation method of a bismuth vanadate crystal material, a lead chromate crystal material, a zinc ferrite crystal material and a semiconductor material. The invention provides a method for realizing the change of semiconductor crystallographic parameters under a high gravity field and changing the bond length and bond angle (M-O) between the metal and oxygen element so as to influence the light absorption range of the crystal, and provides several semiconductor metal oxides which are prepared by the method and have changed absorption spectra. The photocatalytic performance can be effectively influenced by influencing the absorption spectrum of the semiconductor material. According to the bismuth vanadate crystal material, the lead chromate crystal material and the zinc ferrite crystal material provided by the invention, the absorption spectrum is widened, and a good effect is achieved in solar energy utilization.

The invention provides a high-temperature-resistant far infrared radiation ceramic coating, a ceramic coating and a preparation method, and relates to the technical field of surface engineering. The high-temperature-resistant far infrared radiation ceramic coating disclosed by the invention is prepared from the following raw materials in parts by weight: 12 to 22 parts of lutetium pyrotantalate; 10 to 16 parts of hafnium boride; 8-14 parts of nitrogen aluminum titanium; 9 to 15 parts of gadolinium zirconate; 4 to 7 parts of molybdenum disilicide; 2 to 5 parts of samarium hexaboride; 6 to 11 parts of pyrochlore type zirconium tungstate; 1 to 2.5 parts of a sintering aid; 0.5 to 1.5 parts of carbon nano onion; 3 to 6 parts of bismuth vanadate; 5 to 9 parts of phosphotungstic acid; and 1-3 parts of lithium molybdate. According to the high-temperature-resistant far infrared radiation ceramic coating disclosed by the invention, various rare earth compounds and refractory metal compounds are introduced to form a unique multi-phase composite system, and all the components generate a synergistic effect in an optimized interval, so that the thermal stability, thermal shock resistance and mechanical strength of the coating are remarkably improved; and finally, long-acting protection under extreme working conditions of high temperature, corrosion and abrasion of the water cooling wall of the boiler is realized.