171 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 preparation of a titanium dioxide and bismuth vanadate composite photocatalytic material and application of the titanium dioxide and bismuth vanadate composite photocatalytic material in ibuprofen-containing sewage treatment, and belongs to the technical field of photocatalysis and water pollution treatment. The titanium dioxide (TiO2) and bismuth vanadate (BiVO4) photocatalytic material is prepared by adopting a water bath and calcination method. Under ultraviolet irradiation, the material can effectively degrade ibuprofen residual pollutants in a water body and convert the ibuprofen residual pollutants into harmless small molecules or mineralize the ibuprofen residual pollutants into carbon dioxide and water, the degradation rate reaches 99% or above, and excellent cycle stability is still kept in five stability tests. The photocatalyst is green and non-toxic in raw material, low in cost, simple in preparation process, capable of decontaminating ibuprofen in a water body, simple in process and high in decontaminating effect, an environment-friendly and efficient water treatment method is provided, ibuprofen residual pollutants in a water environment can be effectively removed, the influence on a water body ecological system is reduced, and the water body ecological system is protected. Wide application prospects are realized.

The invention discloses a sodium-doped copper bismuthate composite bismuth vanadate high-performance photoelectrode and a preparation method thereof, and belongs to the technical field of electrode materials. The sodium-doped copper bismuthate composite bismuth vanadate high-performance photoelectrode comprising the BiVO4 layer, the Na-CuBi2O4 layer and the nickel borate layer is provided, the sodium-doped copper bismuthate layer serves as a hole transport layer, the surface state is passivated, transport of carriers is promoted, recombination of surface charges is reduced, and the performance of the electrode is greatly improved; the nickel borate layer improves the photocorrosion defect of the material, and the stability is obviously improved; meanwhile, a heterojunction is formed between the BiVO4 layer and the Na-CuBi2O4 layer, so that the light absorption capacity of the BiVO4 is improved, the separation efficiency of photon-generated carriers is also enhanced, and finally, the high-performance photoelectrode with high stability, high carrier separation efficiency and high surface catalytic oxygen production efficiency is obtained.

The invention belongs to the field of chemical engineering, and relates to a preparation method of a high-chroma bismuth vanadate pigment for a coating, which comprises the following steps: mixing a titanium-based ion sieve with an acidic vanadium leachate, filtering after the reaction is completed to obtain a first filtrate, adding mercaptoacetic acid into the first filtrate, and filtering after the reaction is completed to obtain a second filtrate; preparing a bismuth salt solution containing yttrium ions and zirconium ions, mixing the bismuth salt solution with the second filtrate, adjusting the pH value to be in linear gradient change from acidity to neutrality, heating to a first temperature at a set heating rate, aging, centrifuging and drying to obtain a precursor; and calcining the precursor at a second temperature to obtain the bismuth vanadate pigment. According to the method, the acid vanadium leaching solution is used as a raw material, and the bismuth vanadate pigment with high chromaticity and chemical stability is obtained while the production cost is reduced through an innovative ion sieve purification technology and lattice stabilization doping, so that the method has obvious economic benefits.

The invention relates to the technical field of catalytic materials, and particularly discloses a visible light photocatalyst and a preparation method thereof.The visible light photocatalyst comprises a core layer-shell layer-dynamic regulation and control layer three-stage structure; the core layer is heterojunction nano-particles formed by bismuth vanadate and bismuth oxyiodide, and the bismuth vanadate particles are uniformly dispersed on the surface of the bismuth oxyiodide to form a p-n heterojunction; the molar ratio of bismuth vanadate to bismuth oxyiodide in the core layer is 1: (0.5-2), and the particle size range is 30-80 nm; through an elaborately designed three-level structure and a dynamic regulation and control mechanism, the response efficiency and environmental adaptability of the photocatalyst to visible light are remarkably improved. A built-in electric field is formed by utilizing the energy band matching characteristic of bismuth vanadate and bismuth oxyiodide, so that the separation of photo-induced electron-hole pairs is effectively promoted, and the absorption boundary of visible light is expanded to 650nm.

A bismuth vanadate pigment comprising a bismuth- and vanadium-containing core doped with one or more of magnesium, calcium, aluminium and phosphorus, the doped core being coated with an oxidic coating comprising one or more of magnesium, calcium, aluminium and phosphorous.

The invention relates to a preparation method of an oxygen vacancy-rich bismuth molybdate / bismuth vanadate composite photo-anode and a product and application thereof, and belongs to the technical field of photoelectrocatalysis. The invention discloses a preparation method of an oxygen vacancy-rich bismuth molybdate / bismuth vanadate (Bi2Mo2O9 / BiVO4) composite photo-anode, which mainly comprises the following steps: immersing a fluorine ion-doped tin dioxide (FTO) conductive glass substrate into a Bi < 3 + > ion solution and an I <-> ion solution to form a bismuth oxyiodide (BiOI) film, dropwise adding a dimethyl sulfoxide solution of vanadyl acetylacetonate (VO (acac) 2), and putting into a muffle furnace to prepare the BiVO4 photo-anode. And then vertically immersing into a Bi < 3 + > ion solution and a Mo < 6 + > ion solution, and carrying out annealing treatment in an argon atmosphere to prepare the Bi2Mo2O9 / BiVO4 composite photoanode rich in oxygen vacancies. The Bi2Mo2O9 / BiVO4 material rich in oxygen vacancies is a metal oxide composite photo-anode, the photoelectrocatalysis efficiency can be improved, and hydrogen peroxide (H2O2) can be continuously generated in natural seawater through photoelectrocatalytic oxidation of water for a long time.

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 invention discloses a monoclinic-phase molybdenum-doped bismuth vanadate photoelectrode and a preparation method and application thereof, and belongs to the technical field of photoelectrochemical degradation of pollutants and hydrogen production. The monoclinic-phase molybdenum-doped bismuth vanadate photoelectrode is synthesized through a hydrothermal-annealing method, the monoclinic-phase molybdenum-doped bismuth vanadate photoelectrode stands in a sodium hydroxide solution before a tetragonal phase is converted into a monoclinic phase, then the monoclinic-phase molybdenum-doped bismuth vanadate photoelectrode is coated with a molybdenum salt solution, finally phase transformation is achieved through annealing, and the monoclinic-phase molybdenum-doped bismuth vanadate photoelectrode is obtained. The photoelectrode has a columnar structure composed of nanoparticles, has a large specific surface area, is beneficial to carrier separation, and has better performance of photoelectrochemically degrading amino acid and producing hydrogen. And the photoelectrochemical hydrogen production performance of the photoelectrode can be greatly improved and the degradation of the amino acid can be completed by dissolving the amino acid with a certain concentration in water.

The invention relates to the technical field of photo-anodes, in particular to a composite photo-anode with transition metal ions embedded into phosphoric acid small organic molecules and a preparation method of the composite photo-anode. The preparation method comprises the following steps: S1, soaking a bismuth vanadate photo-anode in a phosphoric acid small organic molecule solution, and then performing annealing treatment to obtain a phosphoric acid small organic molecule / photo-anode; and S2, soaking the phosphoric acid small organic molecule / photo-anode in a transition metal salt solution to obtain the composite photo-anode. According to the invention, hole storage and transmission functions of polyphosphoric acid small organic molecules and surface rapid water oxidation reaction kinetics of metal ions are synergistically utilized, on one hand, the electron-hole separation efficiency of bismuth vanadate is improved through hole storage, and on the other hand, surface hydroxyl groups of the polyphosphoric acid small organic molecules and transition metal ions are anchored; bismuth vanadate surface electron-hole separation and water oxidation kinetics are synergistically enhanced, charge recombination is synergistically inhibited, charge transfer power is promoted, and the photocurrent density and the water decomposition hydrogen production capacity of the photoanode are improved.

The invention discloses a bismuth vanadate material for carbon dioxide electroreduction and a preparation method and application, and belongs to the technical field of carbon dioxide electroreduction.The method comprises the steps that bismuth salt is dissolved in a nitric acid aqueous solution, a surfactant is added, and a mixed solution A is obtained through a stirring reaction; dissolving ammonium metavanadate in a sodium hydroxide aqueous solution, adding a surfactant, and carrying out a stirring reaction to obtain a mixed solution B; and mixing the mixed solution A and the mixed solution B, adjusting the pH value to be neutral, and carrying out stirring reaction, hydrothermal reaction, washing, drying and calcination reaction to obtain the bismuth vanadate material for carbon dioxide electroreduction. The preparation method comprises the following steps: uniformly mixing bismuth salt and ammonium metavanadate with a surfactant respectively, and roasting through a hydrothermal method and a template effect of the surfactant to prepare the bismuth vanadate material with high specific surface area for electroreduction of carbon dioxide. In carbon dioxide electroreduction, the catalyst has catalytic performance of high activity, good stability and high selectivity and electrochemical performance of low overpotential and high current density.

The invention provides a high-weather-resistance powder coating and a preparation method thereof, and belongs to the technical field of powder coatings. According to the invention, a hyperbranched polyester skeleton is constructed through esterification reaction of trimethylolpropane, adipic acid and maleic anhydride, hydroxyl-terminated polyether, pentaerythritol and 2, 4-dihydroxybenzophenone are introduced to adjust flexibility, thermal stability and ultraviolet aging resistance, and allyl glycidyl ether is utilized to improve chemical activity and network stability; phosphorus-containing heterocyclic ring-polynitrogen imide oligomer is generated through substitution reaction and subsequent modification of phosphonitrilic chloride trimer, aniline and ethanolamine, and the coating is endowed with flame retardance, heat resistance and adhesive force. In the preparation of the coating, carboxyl polyester resin and a curing agent are crosslinked to form a three-dimensional network, and filler and auxiliaries such as precipitated barium sulfate, silica powder and bismuth vanadate yellow pigment are combined, so that the mechanical strength, chemical resistance and ultraviolet aging resistance of a coating film are optimized.

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 discloses a bismuth vanadate (BiVO4) / biomass charcoal composite photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of environmental functional materials. According to the catalyst, biomass charcoal generated by pyrolysis of reed straw is used as a carrier, and BiVO4 is loaded on the porous surface of the biomass charcoal through an in-situ hydrothermal method, so that a heterojunction structure is formed. According to the composite material, norfloxacin is enriched through the high adsorption performance of the biomass charcoal, separation of photon-generated carriers is promoted through heterojunction of BiVO4 and the biomass charcoal, the catalytic activity under visible light is remarkably improved, the degradation efficiency of norfloxacin can reach 88% within 180 min, and after four times of circulation, the composite material shows good circulation stability. The method has the advantages of low cost, resource utilization and high stability, and a green solution is provided for antibiotic pollution control.

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 discloses an anode active material and a preparation method thereof, a composite photoelectrode and a super capacitor battery, and relates to the technical field of electrochemical energy storage, the anode active material comprises oxygen-deficient bismuth vanadate and lanthanum chloride loaded on the oxygen-deficient bismuth vanadate, and the anode active material has pores. According to the invention, bismuth vanadate in the anode active material has oxygen defects, so that the conductivity of the bismuth vanadate electrode is improved, and the separation of electrons and holes in a bismuth vanadate bulk phase is promoted; lanthanum chloride in the anode active material promotes the injection efficiency of carriers on the surface of the bismuth vanadate electrode, the valence band structure of bismuth vanadate is changed, and the conductivity is greatly improved; in addition, the anode active material has pores, so that enough mechanical strain space is provided in the charging and discharging process, the volume expansion of bismuth is relieved, and the stability of the electrode is improved.

The invention provides a bismuth vanadate modified strontium titanate photocatalytic material and a preparation method thereof. The bismuth vanadate modified strontium titanate photocatalytic material is prepared by mixing the following components in percentage by weight: 0.1-10% of strontium titanate, 0.1-10% of a bismuth vanadate catalyst and 80-95% of a solvent. The preparation method comprises the following steps: 1, mixing strontium titanate with a solvent, and carrying out ultrasonic dispersion treatment on the mixture for 30 minutes to form a uniformly dispersed suspension A; step 2, adding bismuth vanadate into the turbid liquid A, and magnetically stirring for 60 minutes at normal temperature; 3, solid powder is separated, washed and dried; according to the invention, XRD and SET tests prove that BiVO4 and SrTi O3 are successfully subjected to Z-type heterogeneous compounding. Test results show that the formaldehyde removal rate of the material in a liquid phase under visible light reaches up to 88% and is not lower than 80% after four times of circulation, and the material has good stability.

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 present invention discloses a photoanode material applied to the synchronous treatment of ammonia nitrogen and refractory organic compounds in high-chloride wastewater by photoelectrocatalysis. It is characterized in that tungsten oxide is in-situ loaded on doped-fluorine SnO2 conductive glass in sequence by layer, oriented crystal plane bismuth vanadate with a carrier space pre-separation structure is hydrothermally grown, and cobalt borate salt cocatalyst is photo-assisted electro-deposited, which greatly improves the photoelectric performance from multiple perspectives such as the effective separation of photo-generated electrons and holes, the charge transfer resistance at the photoanode / solution interface, and the conversion rate of photo-generated holes to redox equivalent substances. The photoelectrochemical system using it as the photoanode realizes the in-situ generation of strongly oxidizing active chlorine by using chloride ions, promotes the oxidation of refractory organic compounds and ammonia nitrogen, effectively controls the generation amount of nitrate nitrogen at the same time, improves the denitrification efficiency, and has the advantages of high efficiency and stability in the synchronous removal process of ammonia nitrogen and refractory organic compounds in high-chloride wastewater.

The present invention relates to an oxygen ion conductor material with high oxygen ion conductivity in the medium and low temperature range and a preparation method thereof. The chemical composition of the material is represented by: Bi4(V 1‑y M y ) x O 11+z , wherein M is a metal cation, 1.7≤x≤2.2 and x≠2, 0<y≤0.3, and z depends on the neutral balance of the metal cation composition. The modified bismuth vanadate Bi4 (V 1‑y M y ) x O 11+z Materials have simple preparation process, low cost, stable structure and high conductivity, among which Bi4(V 0.9 Cu 0.1 ) 1.9 O 10.465 At 300℃, the grain conductivity is 10 ‑2 S / cm level, the total ionic conductivity of ceramics reaches 1.2×10 ‑3 S / cm, which is about 1 order of magnitude higher than the current highest value reported in the literature, and can meet the application requirements of medium and low temperature oxide fuel cells and oxygen sensors.

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 application provides a kind of high weatherability powder coating and its preparation method, belong to powder coating technical field;The application constructs hyperbranched polyester skeleton by esterification reaction of trimethylolpropane, adipic acid and maleic anhydride, introduces end hydroxyl polyether, pentaerythritol and 2,4-dihydroxybenzophenone to adjust flexibility, thermal stability and anti-uv aging performance, and uses allyl glycidyl ether to improve chemical activity and network stability;Through substitution reaction of hexachlorocyclotriphosphazene and aniline, ethanolamine and subsequent modification, phosphorus-containing heterocyclic-polyazimide oligomer is generated, which gives the coating flame retardance, heat resistance and adhesion;In the preparation of coating, carboxyl polyester resin and curing agent are crosslinked to form a three-dimensional network, combined with barium sulfate, silica powder and bismuth vanadate yellow pigment and other fillers and additives, the mechanical strength, chemical resistance and anti-uv aging performance of the coating film are optimized.

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 belongs to the field of chemical engineering, and relates to a long-acting anti-oxidation bismuth vanadate pigment for a coating and a preparation method thereof, and the preparation method comprises the following steps: preparing a bismuth vanadate matrix by adopting a sol-gel method; and grafting a tea polyphenol derivative EGCG-COOH on the surface of the bismuth vanadate matrix. According to the long-acting anti-oxidation bismuth vanadate pigment for the coating and the preparation method of the long-acting anti-oxidation bismuth vanadate pigment, the bismuth vanadate matrix is prepared by adopting a sol-gel method, the particle size can be strictly controlled, and excellent optical performance is ensured; rich hydroxyl groups can be formed on the surface of bismuth vanadate prepared by a sol-gel method, so that ester bonds can be formed with carboxyl groups of EGCG-COOH, and the grafting efficiency is improved; eGCG-COOH is used as a bio-based anti-oxidation layer to improve the long-acting anti-oxidation performance of the bismuth vanadate pigment, the release rate of EGCG can be regulated and controlled through carboxyl modification, the anti-oxidation activity is prolonged, and the durability of the anti-oxidation layer is remarkably improved.

The present invention belongs to the technical field of composite materials, relates to composite electrode materials, and particularly relates to a preparation method of benzoic acid complex composite bismuth vanadate. The method includes using N,N-dimethylformamide as a solvent, adding ligand benzoic acid to prepare a solution with a concentration of 0.01 - 0.1 M, respectively adding metal ligand ion precursors with the same molar number as BEN, and stirring evenly to prepare a precursor solution; placing the FTO sheet loaded with BiVO4 with the conductive surface facing down into a stainless steel autoclave with a polytetrafluoroethylene liner, adding the precursor solution, carrying out a solvothermal reaction at 100 - 140 °C for 5 - 15 h, taking it out after cooling to room temperature, washing with ethanol and drying to obtain the product. The present invention also applies the prepared composite to photoelectrochemical water splitting for hydrogen production. The metal benzoic acid complex M-BEN-MOC is compounded on the surface of worm-like BiVO4, effectively enhancing the carrier migration rate of the optoelectronic material, improving the electron-hole separation efficiency and the photoelectrocatalytic performance. The prepared binary metal iron-nickel benzoic acid complex BiVO4 / FeNi-BEN-MOC catalyst has good application prospects in the fields of environment, energy, etc.

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 present invention discloses a hydrangea-shaped bismuth vanadate-MXene heterojunction and its preparation method and application, belonging to the field of nanofunctional materials technology. The preparation method obtains a hydrangea-shaped bismuth vanadate-MXene heterojunction by selecting a bismuth source and controlling the reaction conditions. It is not only simple to operate but also has low requirements for equipment and has the potential for industrialization. The hydrangea-shaped bismuth vanadate-MXene heterojunction obtained by this preparation method has a novel structure. The array structure of the hydrangea-shaped surface can significantly increase the contact area with the electrolyte, achieving better ion transmission effect and greatly alleviating volume expansion during battery charging and discharging. At the same time, the built-in electric field at the heterojunction interface can promote charge transfer, further improving electrochemical performance, and has good application prospects in sodium ion batteries.