26 results about "Bismuth oxybromide" patented technology

The invention relates to the technical field of photocatalysts, in particular to a bismuth-defect bismuth oxybromide-sulfur-defect bismuth sulfide bromide heterojunction and a preparation method and application thereof in photocatalytic CO2 reduction, Bi (NO3) 3.5 H2O, thiourea, cetyltrimethylammonium bromide (CTAB) and the like are used as raw materials, and the VBi-Bi4O5Br2 / VS-Bi19Br3S27 heterojunction is prepared through a two-step hydrothermal method. According to the VBi-Bi4O5Br2 / VS-Bi19Br3S27 heterojunction, bismuth vacancies and sulfur vacancies are introduced, the visible light absorption range of the material is expanded through a proper amount of double vacancies, more electron capture centers are provided, and the separation efficiency of photo-induced electrons and the vacancies is improved, so that the VBi-Bi4O5Br2 / VS-Bi19Br3S27 heterojunction has excellent performance of photocatalytic reduction of CO2, and the preparation method of the VBi-Bi4O5Br2 / VS-Bi19Br3S27 heterojunction is suitable for large-scale production and application of the VBi-Bi4O5Br2 / VS-Bi19Br3S27 heterojunction. CO2 can be reduced into a single product CO, and the photoreduction efficiency of the carbon dioxide can be improved.

According to the graphene quantum dot regulated bismuth oxybromide photocatalytic material as well as the preparation method and the application thereof provided by the invention, the two-dimensional photocatalytic material Bi24O31Br10 is combined with the GQDs with good conductivity to form a composite structure, so that the photocatalytic efficiency is remarkably improved. According to the structure, the specific surface area of the material is increased, more active sites are provided, and separation and transmission of photogenerated charges are promoted, so that the rate and efficiency of a photocatalytic reaction are improved. Due to the introduction of the GQDs, the GQDs / Bi24O31Br10 composite material can effectively utilize a visible light part in a solar spectrum, so that the light response range of a photocatalyst is expanded, and the photocatalyst can absorb light energy in a wider spectral range. The GQDs / Bi24O31Br10 composite material prepared by the invention is suitable for photocatalytic degradation of antibiotics such as norfloxacin and the like, and has a wide application prospect.

The invention discloses a preparation method and application of a BiOBr-based composite material, and the preparation method of the BiOBr-based composite material comprises the following steps: (1) adding a bromine-containing precursor solution into a bismuth-containing precursor solution to obtain a mixed solution, and dropwise adding ethanolamine into the mixed solution; and (2) adding TPP into the solution after the reaction in the step (1), carrying out ultrasonic dispersion, transferring into a hydrothermal reaction kettle after dispersion, carrying out hydrothermal reaction, and carrying out centrifugal separation after the reaction to obtain the BiOBr-based composite material. The TPP / BOBZ type heterojunction material prepared by the invention is a nanosheet, the synthesis steps are simple, the obtained material integrates the characteristics of a bismuth oxybromide-based material and a TPP material, and TPP / BOB shows excellent sterilization activity.

The invention discloses a full-spectrum response BiOBr / Bi2O3-x / WO3-x double-S heterojunction material rich in oxygen vacancy as well as a preparation method and application of the full-spectrum response BiOBr / Bi2O3-x / WO3-x double-S heterojunction material. The heterojunction is prepared by taking bismuth nitrate pentahydrate, potassium bromide and WO3-x microspheres containing oxygen vacancies as main raw materials through a wet impregnation method, and the value range of x in Bi2O3-x and WO3-x is 0 < = xlt; 1 represents that the two have oxygen vacancies with certain concentration. Due to the introduction of the wide-spectrum response semiconductor materials WO3-x and Bi2O3-x, the double-S-type heterojunction shows a remarkable full-spectrum absorption capability. Meanwhile, oxygen vacancies in the material can serve as effective electron capture centers and transmission channels, and separation of photo-induced electron-hole pairs is effectively promoted. Based on the synergistic coupling effect among BiOBr, Bi2O3-x and WO3-x, the heterojunction can degrade ciprofloxacin (CIP) and reduce Cr (VI) (85% and 74% respectively) at the same time. The heterojunction material provided by the invention is simple in preparation process and good in repeatability, and has important application potential in the field of environmental governance.

The invention belongs to the technical field of air pollution prevention and control of photocatalytic materials, and particularly relates to a nitrogen-doped bismuth oxybromide-graphite phase carbon nitride heterojunction photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: 1) respectively dissolving ammonium sulfate, bismuth nitrate and potassium bromide in water, mixing and transferring into polytetrafluoroethylene, and obtaining nitrogen-doped bismuth oxybromide by utilizing a hydrothermal method; 2) adopting a hydrothermal-assisted thermal polymerization method, obtaining a precursor through a melamine hydrothermal reaction, and performing nitrogen calcination to obtain tubular graphite-phase carbon nitride; 3) adding the mixed sample into methanol, and adopting a mechanical stirring method to obtain the nitrogen-doped bismuth oxybromide-graphite phase carbon nitride heterojunction photocatalyst. Due to the formation of the heterojunction, the activity of the nitrogen-doped bismuth oxybromide-graphite phase carbon nitride in photocatalytic reduction of carbon dioxide can be greatly improved.

The application provides a nitrogen-doped carbon-encapsulated sheet layer stacked microrod-shaped bismuth material and a preparation method and application thereof. The microrod-shaped bismuth matrix is tightly stacked by a plurality of sandwiched nanosheet units, the inside of the sheet layer is metal bismuth, and the outside is a nitrogen-doped carbon shell. The nitrogen-doped carbon-encapsulated sheet layer stacked microrod-shaped bismuth material is obtained by sintering and carbonization of the sheet layer stacked structure containing the microrod-shaped bismuth oxybromide coated with dopamine. The nanosheet units of the material are stacked to form a microstructure, and the nitrogen-doped carbon is tightly encapsulated outside, so that when the material is used as a negative electrode of a sodium ion battery, the transmission path of sodium ions can be effectively shortened to realize fast charging and discharging, direct contact between electrolyte and metal bismuth can be prevented, and the volume expansion of the material during the sodium intercalation / deintercalation process can be fully relieved, thereby greatly improving the rate performance and cycle stability of the battery.

This invention relates to the field of nanoscale full-spectrum photocatalytic materials, and particularly to a method for preparing a molybdenum selenide / oxygen-deficient bismuth oxybromine@gold three-phase Z-type heterojunction photocatalyst. This method solves the problems of low photogenerated electron-hole separation efficiency, narrow full-spectrum response range, and poor stability in existing bismuth-based photocatalysts. The preparation method involves first preparing oxygen-deficient BiOBr nanospheres via a solvothermal method, then directly reacting tetrachloroauric acid with oleylamine in toluene to prepare small-particle-size monodisperse Au nanoparticles, which are then combined with oxygen-deficient BiOBr to prepare a BiOBr@Au nanosphere core-shell structure. Finally, a MoSe2 / oxygen-deficient BiOBr@Au three-phase composite material is prepared via a hydrothermal reaction. The catalyst of this invention exhibits absorption capacity under the full spectrum of light, and simultaneously achieves a synergistic enhancement of carrier separation efficiency and strong redox capability, demonstrating excellent photocatalytic activity and the ability to efficiently degrade pollutants and produce hydrogen.

The invention discloses a modified bismuth oxybromide composite photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic organic synthesis. The preparation method comprises the following steps: mixing Bi (NO3) 3, KBr and Cu (NO3) 2, adding chlorophyll, and stirring to obtain the modified bismuth oxybromide composite photocatalyst. The Cu-doped chlorophyll co-regulated nano bismuth oxybromide photocatalyst is synthesized, the Cu-doped chlorophyll co-regulated nano bismuth oxybromide photocatalyst is used for photocatalysis of bimolecular oxidative coupling of benzylamine and methylamphetamine, bimolecular coupling of methylamphetamine and benzylamine is carried out under 10W visible light for the first time, the conversion rate can reach 99.5%, the product is alpha-methyl-N-(benzylidene) phenylethylamine, and the product has a wide application prospect. The method realizes detoxification treatment of methylamphetamine, realizes efficient and green synthesis of an imine compound under a noble metal-free condition, and can efficiently photocatalyze oxidative coupling of methylamphetamine and chemically degrade pollutants in water.

The invention discloses a portable detection device and a detection method for detecting microcystic toxins based on bismuth oxybromide doped biomass carbon, and belongs to the field of photoelectrochemical detection devices. The prepared BiOBr-coated BC nano composite material is used as a working electrode and is applied to a detection device, and the detection device further comprises a control system and a detection system. The detection system is fixed in the detection system shell, and the control system is fixed in the control system shell. Wherein the control system controls the LED lamp to emit exciting light to irradiate the working electrode, and the nano material in the detection system enters an excited state after receiving light to generate current. After a detection target object is added, separation of hole electron pairs can be influenced, so that the change of current is influenced. The concentration of the detected object is reflected by detecting the current change after the target objects with different concentrations are added. The device provided by the invention can realize detection of weak current signals, and meanwhile, compact and small equipment provides a scheme for portable detection.

The method comprises the following steps: firstly, preparing ferric vanadate through a hydrothermal reaction and calcination, then reacting the ferric vanadate with bismuth nitrate and potassium bromide to synthesize ferric vanadate bismuth oxybromide composite particles, finally adding the composite particles into a solvent, mixing the composite particles with polyvinylidene fluoride and the like to prepare a membrane casting solution, and finally, preparing the membrane casting solution into the photocatalytic membrane. And standing, degassing, forming a film and curing to obtain the photocatalytic film. According to the method, the photocatalytic efficiency and the visible light utilization capability are improved by utilizing the bismuth oxybromide iron vanadate heterojunction, the bismuth oxybromide iron vanadate heterojunction is compounded into the polyvinylidene fluoride matrix, the problems of catalyst recovery and falling are solved, and the membrane is endowed with anti-pollution and self-cleaning capabilities. And the preparation process ensures sufficient construction of heterojunctions, good interfacial compatibility and complete membrane structure, so that interfacial charges are smoothly transferred, the structural defects are reduced, efficient synergy of photocatalysis and membrane separation technologies is realized, the antibiotic wastewater treatment effect is improved, and the method has a good application prospect.

The application discloses a preparation method of a bismuth sulfide nanorod / bismuth oxybromide composite photocatalytic material. The method adopts a hydrothermal method, first prepares a bismuth sulfide precursor, and then grows the bismuth sulfide nanorod / bismuth oxybromide composite material through hydrothermal growth after the bismuth sulfide precursor is uniformly stirred with bismuth nitrate pentahydrate and sodium bromide. The composite material has a unique nano structure and good photocatalytic performance by adjusting the mass of the bismuth sulfide precursor in the composite material. When 2 mmol of bismuth oxybromide and 0.05 g of the bismuth sulfide precursor are used to hydrothermally synthesize the bismuth sulfide nanorod / bismuth oxybromide composite material, the composite material has the optimal rhodamine B removal performance, and the removal rate can reach 99.2% after 30 min of dark adsorption and 15 min of photocatalytic reaction; meanwhile, the bismuth sulfide nanorod / bismuth oxybromide composite photocatalytic material also has good removal effects on tetracycline, methyl orange and other organic pollutants.

The invention discloses a circulation-type photoelectric synergistic catalytic filtration system for removing new pollutant wastewater by efficiently activating molecular oxygen, which has multiple advantages of efficiently activating molecular oxygen, realizing photoelectric synergistic interaction and enhancing mass transfer by a flow system, and is beneficial to realizing efficient removal of new pollutants. The circulation type photoelectric synergistic catalysis filtering system comprises a shell, a negative electrode, a positive electrode and an interlayer, wherein an anode, a non-woven fabric interlayer, a cathode and a sealing ring are sequentially arranged in the shell; wherein the anode is a bismuth oxybromide / carbon nitride / samarium-bismuth vanadate photoelectrode, and the cathode is a ferrocobalt diatom confinement carbon nanotube electrode; the broadband spectral response material and the novel catalyst design significantly improve the anti-interference performance, and adapt to complex water quality and low-concentration pollution scenes. New pollutant wastewater can be efficiently removed after being illuminated and electrified in the circulation type photoelectric concerted catalytic filtration system in a circulation flow mode, and the removal rate of ibuprofen within 2 hours can reach 96%. The method is simple in design, easy to operate, low in cost and small in energy consumption, solves the problems of low removal efficiency, high energy consumption and the like of a common treatment system, further reduces the operation cost in cooperation with solar full spectrum utilization and low catalyst dosage design, and shows the comprehensive advantages of high efficiency, stability, economy and environmental protection.

The invention discloses a synthesis method and application of a bismuth-rich bismuth oxybromide solid solution single crystal nanosheet for visible light driven full water decomposition. According to the method, bismuth oxide and lanthanum oxide are used as raw materials, a binary molten salt system of potassium bromide and lithium bromide is used as a bromine source, the bismuth-rich bismuth oxybromide solid solution single crystal is synthesized in situ, in the process, the stoichiometric ratio of the bismuth oxide to the lanthanum oxide is regulated and controlled, complete mutual dissolution of the lanthanum and the bismuth in crystal lattices can be achieved, and the bismuth-rich bismuth oxybromide solid solution single crystal is obtained. Therefore, the formed bismuth-rich bismuth oxybromide solid solution is stable in structure. The prepared bismuth-rich bismuth oxybromide solid solution monocrystal nanosheet has the advantages of simple synthesis process, good repeatability and the like, meets the requirements of large-scale production, not only has an energy band structure required by a full-water decomposition reaction, but also can effectively inhibit the compounding process of photo-induced electron-hole pairs, and is suitable for large-scale production. The separation efficiency and the surface migration rate of current carriers are remarkably improved, so that wide application prospects are shown.

The invention discloses an application of a QL-COF-BiOBr composite material in synchronous reduction of Cr (VI) and degradation of butyl xanthate composite wastewater treatment. The composite material is composed of a QL-COF matrix and bismuth oxybromide nanoparticles loaded on the surface and in pores of the QL-COF matrix and is used for treating composite wastewater containing Cr (VI) and butyl xanthate, and Cr (VI) reduction (the reduction rate is larger than or equal to 90%) and butyl xanthate degradation (the degradation rate is larger than or equal to 95%) are synchronously achieved through the adsorption-photocatalysis synergistic effect. The composite material has high adsorption capacity and high photocatalytic activity, the preparation process is simple, the stability is high, large-scale production is easy, the process is simplified during composite wastewater treatment, the cost is low, and the composite material is suitable for industrial popularization and application.

The invention provides a preparation method of a Bi4O5Br2-ZnO composite photocatalyst, which comprises the following steps: mixing an aqueous solution of sodium bromide and an ethanol solution of bismuth nitrate pentahydrate, adjusting the pH value of the mixed solution by using ammonia water, adding nano zinc oxide, putting the mixed solution into a high-pressure kettle, carrying out hydrothermal reaction for sufficient time under the conditions of constant temperature and constant pressure, and carrying out vacuum drying to obtain the Bi4O5Br2-ZnO composite photocatalyst. And cooling, precipitating, washing and drying the reactant to finally obtain the Bi4O5Br2-ZnO composite photocatalyst. The preparation method is simple, raw materials are easy to obtain, and the method is suitable for large-scale amplification. According to the Bi4O5Br2-ZnO composite photocatalyst prepared by the preparation method disclosed by the invention, an ultraviolet visible light absorption spectrum has red shift by reducing a band gap, so that the light wave absorption range is remarkably widened, and the utilization rate of the catalyst to sunlight is effectively improved; an interface formed by zinc oxide and bismuth-rich bismuth oxybromide can effectively promote migration and separation of photon-generated carriers, increase reaction active sites and improve the efficiency and stability of photocatalytic reduction of CO2 into CO so as to achieve the purpose of assisting carbon emission reduction.

The invention discloses a preparation method and application of a bismuth tungstate nanosheet composite material, and the preparation method comprises the following steps: preparing bismuth tungstate nanosheet powder and bismuth oxybromide nanoflower powder in advance, then mixing and stirring the bismuth tungstate nanosheet powder and the bismuth oxybromide nanoflower powder uniformly, and performing centrifugal drying to obtain a B delta B finished product; according to the preparation method of the bismuth tungstate nanosheet composite material, the bismuth tungstate nanosheet composite material is rich in bismuth vacancies; the bismuth tungstate nanosheet composite material is applied to photocatalytic degradation of antibiotic pollutants. The bismuth tungstate nanosheet loaded bismuth oxybromide nanoflower composite material rich in bismuth vacancy is prepared from bismuth tungstate nanosheet powder and bismuth oxybromide nanoflower powder, compared with a monomer, the light absorption and oxidation reduction capacity is optimized, photo-generated electron-hole pairs can be effectively separated, the recombination rate of Bi2WO6 and BiOBr photo-generated carriers is effectively reduced, and the photocatalytic performance of the Bi2WO6 / BiOBr composite material is improved. The preparation process is simple, large-scale mass production is achieved, and huge application possibility is shown.

The present application relates to a kind of bismuth oxybromide / biochar composite for nitrogen fixation and preparation method and its application in photocatalytic nitrogen fixation.The composite is composed of layered porous biochar and rose-like bismuth oxybromide, bismuth oxybromide nanosheet is vertically or obliquely oriented growth in the two-dimensional surface and three-dimensional pore inside of biochar, form 0D-2D face-face contact heterostructure, rather than traditional point-face contact.The preparation method includes controllable preparation of corn straw biomass BC carrier and in-situ growth induced by chemical bond.And its application in photocatalytic nitrogen fixation.By introducing the physical support function of biochar, the problems of BiOBr nanosheet easy to agglomerate, few surface active sites, weak nitrogen adsorption and activation ability, poor cycle stability and short service life are solved.

The invention is applicable to the technical field of preparation of composite fiber materials, and provides a preparation method and application of a multifunctional photocatalytic composite fiber membrane, and the multifunctional photocatalytic composite fiber membrane is prepared by loading composite photocatalytic functional particles on a composite fiber membrane with adjustable aperture through an electrostatic spinning technology by utilizing intermolecular hydrogen bond interaction. The pore-diameter-adjustable composite fiber membrane is formed by using hydrophobic fibers as a supporting framework and hydrophilic fibers as a water transmission material; according to the composite photocatalytic functional particles, bismuth oxybromide grows in situ on the surface of a wide-band-gap semiconductor through solvothermal reaction to construct a heterostructure, and bismuth elementary substances and silver elementary substances are loaded by means of photodeposition to jointly enhance visible light absorption and utilization efficiency. The multifunctional photocatalytic composite fiber membrane prepared by the invention integrates hydrophobic support, hydrophilic transport and photocatalytic functions, and can efficiently remove various pollutants such as heavy metals and metalloids, dyes, antibiotics and phenolic compounds.

The application provides an electrosorption material for electrochemically extracting bromine and a preparation method and application thereof. The electrosorption material comprises bismuth oxybromide nanosheets and polyethylenedioxythiophene loaded on the surface of the bismuth oxybromide nanosheets, and the mass ratio of the bismuth oxybromide nanosheets to the polyethylenedioxythiophene is 1-10:0.1-5. The electrosorption material provided by the application has a large adsorption capacity, good cycle stability and excellent selective adsorption. The electrosorption material still has adsorption capacity for a solution with a bromide ion content of less than 100 mg / L, and is suitable for extracting bromine in oilfield brine.

The invention discloses a Br / O double-vacancy double-bismuth-based crystal form-amorphous junction as well as a synthesis method and application thereof, and belongs to the technical field of catalysts. The synthesis method comprises the following steps: taking manganese-doped bismuth oxybromide as a matrix, and forming Mn < 4 + > in a hydrothermal reaction through doping of manganese ions to promote the formation of bromine vacancies in the bismuth oxybromide, so as to obtain the manganese-doped bismuth oxybromide; amorphous bismuth tungstate partially covers the surface of a substrate of manganese-doped bismuth oxybromide in a non-continuous manner, and oxygen vacancies are formed in the amorphous bismuth tungstate through hydrothermal reaction. The special energy band structure of the catalyst can generate photo-induced electrons required for reducing Cr < 6 + > ions, and bromine vacancies are formed after manganese doping; the amorphous bismuth tungstate not only serves as an electron generation and transfer center, but also forms a heterojunction through an interface coupling effect; the optimization promotes the formation of Br / O double vacancies in the heterojunction, effectively inhibits the recombination of photon-generated carriers, and finally enables the photoreduction rate of the system to 100 mg.L <-1 > Cr < 6 + > ions under visible light to reach 8.5 times of that of a manganese-doped bismuth oxybromide material, thereby realizing the Br / O double-vacancy double-bismuth-based crystal form-amorphous junction, the synthetic method and the photoreduction effect of high-concentration Cr < 6 + > ions.

The invention discloses an S-type tantalum pentanitride / bismuth oxybromide heterojunction photocatalyst, and belongs to the technical field of environmental engineering water treatment. The preparation method of the S-type tantalum pentanitride / bismuth oxybromide heterojunction photocatalyst comprises the following steps: adding bismuth salt into an organic solvent, dissolving, adding Ta3N5 with exposed {001} crystal face, uniformly mixing, adding a bromine source, reacting, collecting a product, dispersing in a hydrochloric acid solution, and carrying out a second heating reaction to obtain the S-type tantalum pentanitride / bismuth oxybromide heterojunction photocatalyst. The S-type tantalum pentanitride / bismuth oxybromide heterojunction photocatalyst is obtained. The S-type tantalum pentanitride / bismuth oxybromide heterojunction photocatalyst prepared by the invention can improve the transmission efficiency of photon-generated carriers and strengthen the S-type heterojunction effect, thereby improving the photocatalytic treatment efficiency of pollutants.

The application discloses a sulfur-doped lignin-based carbon / bismuth oxybromide photocatalytic material and a preparation method and application thereof, and belongs to the photocatalytic field.The application prepares a flower-shaped sulfur-doped lignin-based carbon / bismuth oxybromide photocatalytic material through a one-pot solvothermal method by taking a sulfur-doped lignin-based carbon dispersion liquid as a reaction solvent.The sulfur-doped lignin-based carbon serves as a structure directing agent to form the flower-shaped photocatalyst, and the lignin serves as a carbon source and the feather serves as a sulfur-doped precursor, so that the advantages of greenness, economy and sustainability are achieved, and the environmental pollution can be alleviated and the recycling of waste resources can be improved.Compared with bismuth oxybromide, the specific surface area of the sulfur-doped lignin-based carbon / bismuth oxybromide is larger, the light absorption is better, and the photo-generated carrier separation efficiency is high.The photocatalytic material is used for photocatalytic reduction of Cr(VI) under visible light, has the advantages of simple preparation method and high visible light catalytic activity, and provides an economic, green and sustainable way for Cr(VI) reduction.

The invention provides preparation and application of a visible-light response type photochromic iodine-doped bismuth oxybromide catalyst, and belongs to the field of preparation and application of photocatalysts. The iodine-doped bismuth oxybromide BiOBr0. 92I0. 08 is synthesized by a hydrothermal method, and has the characteristics of high purity, simple structure, good stability, good dispersity and the like. The obtained product can be deeply colored within 15 seconds under illumination of 450 nm, and fades in air; and rapid coloring and color fading can be realized under ultraviolet irradiation. The conversion number (TON) of the BiOBr < 0.98 > I < 0.02 > nanosheet for photocatalytic oxidation of ethylbenzene reaches up to 274000 mol.g, which is 7 times that of the BiOBr nanosheet. The method has the advantages of low synthesis cost, no pollution, suitability for large-scale industrial production and the like, and can be applied to photocatalytic oxidation of ethylbenzene.

The present application relates to the field of semiconductor materials, and aims to provide a preparation method of a photocatalytic material responding to ultraviolet, visible and near-infrared light simultaneously.The method comprises the following steps: mixing rare earth ion doped bismuth oxybromide, an alcohol solvent and a molybdenum disulfide quantum dot dispersion liquid, continuously stirring and mixing uniformly, and performing a hydrothermal reaction; after the reaction is completed, naturally cooling to room temperature; and after the obtained precipitate is filtered, washed, centrifuged and dried, a molybdenum disulfide quantum dot loaded bismuth oxybromide used as a photocatalytic material is obtained.The present application obtains a certain concentration of oxygen vacancies in the crystal lattice through doping and morphology control means, the oxygen vacancies can effectively promote the separation and migration of photo-generated carriers, and an intermediate energy level is formed in the original energy band structure; while the energy of the ultraviolet and visible light bands in the solar energy is retained, the utilization of near-infrared upconversion light is also expanded.Therefore, the performance of the photocatalyst can be further improved, and the utilization efficiency of light energy in practical application is improved.

The invention provides an S-type bismuth oxybromide / cesium tungsten bronze energy storage heterojunction as well as a preparation method and application thereof. The BiOBr / KxCs0.32-xWO3 S-type energy storage heterojunction is prepared by an electrostatic adsorption method of positive and negative charges generated by synergism of optical excitation and piezoelectric effect. The two piezoelectric crystals are compounded to enhance the piezoelectric response capability, the piezoelectric coefficient d33 of the piezoelectric crystals is increased to 56.27-79.92 nm * V <-1 >, and excitons can be formed on the interface of the piezoelectric crystals; the piezoelectric catalytic activity of the energy storage heterojunction is enhanced by enhanced redox piezoelectric potential and excitons formed on the interface. Under the synergistic effect of energy storage heterojunction enhanced redox piezoelectric potential, excitons formed on an interface, an energy storage heterojunction series polarization electric field and an interface S-type electric field, h < + >, e <->,. O < 2->, OH and < 1 > O < 2 > are formed to effectively degrade organic pollutants.

The invention provides a two-dimensional multi-level micro-nano bismuth carbon composite material and a preparation method and application thereof.The material is of a multi-layer stacked micron sheet structure, and the stacked micron sheet structure is of a secondary multi-sheet-layer structure composed of a plurality of primary sheet layer units which are assembled with one another and have interlayer intervals; the primary lamellar unit comprises a carbon shell and bismuth nanoparticles wrapped by a carbon wall, and the bismuth nanoparticles wrapped by the carbon wall are embedded in the carbon shell to form dual-carbon constraining force on the bismuth nanoparticles. The preparation method comprises the following steps: preparing a two-dimensional multi-level bismuth oxybromide precursor; and converting the two-dimensional multi-level bismuth oxybromide precursor into the two-dimensional multi-level micro-nano bismuth carbon composite material by using a carbon thermal reduction method. The material is simple and safe in preparation operation and short in period. The two-dimensional multi-level structure enables the bismuth nano-particles to be densely embedded, high tap density and bismuth content are endowed, high sodium storage capacity is ensured when the two-dimensional multi-level structure is used for the sodium ion battery, and the rate capability is improved; the large interlayer spacing of the multi-layer carbon plate and the double-carbon barrier relieve the volume change, reduce the side reaction and improve the cycling stability.