41 results about "Tio2 photocatalyst" patented technology

The invention discloses a transition metal modified carbon fiber loaded titanium dioxide photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: dispersing a first transition metal salt, a second transition metal salt, a coupling agent and biomass cellulose in a solvent for hydrothermal reaction to obtain transition metal modified composite biomass cellulose; then dispersing the transition metal modified composite biomass cellulose, titanium salt and urea in a solvent for a coupling reaction to obtain a titanium dioxide photocatalyst precursor; finally, the titanium dioxide photocatalyst precursor is sequentially subjected to pyrolysis treatment and lower activation treatment, and the titanium dioxide photocatalyst is obtained. According to the preparation method provided by the invention, a mode of first loading and then pore forming is adopted, so that the prepared titanium dioxide photocatalyst has excellent photocatalytic performance and stability.

The invention relates to the technical field of inorganic pigments, and particularly discloses a rutile type titanium dioxide pigment special for polycarbonate (PC). The rutile type TiO2 photocatalyst comprises a rutile type TiO2 core; the inner coating layer is a composite oxide of Al2O3 and ZrO2, and the molar ratio of Al to Zr is 1: (0.3-0.5); the middle coating layer is prepared from MgO nano particles; the outer coating layer is organic silicon resin containing epoxy groups; and the middle coating layer and the outer coating layer are coupled by adopting triisostearoyl titanate. The problems that in the prior art, a rutile titanium dioxide surface modification auxiliary (such as aluminum oxide) is extremely hydrophilic and easily adsorbs water molecules to initiate a hydrolysis reaction, a polysiloxane layer needs to be additionally arranged outside an aluminum oxide layer to prevent water, but the dense aluminum oxide layer prevents polysiloxane from permeating to the titanium dioxide surface, and the service life of the titanium dioxide surface is affected are solved. The anchoring efficiency of the modifier is reduced, a polysiloxane layer is easy to fall off, and the weather resistance is poor.

The utility model relates to the technical field of explosive explosion heat testing, and particularly discloses an explosion heat bomb gas replacement system which comprises a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a pressure sensor, a nitrogen cylinder, an exhaust valve, a vacuum pump and a controller. The air outlet end of the second solenoid valve is connected with the vacuum pump through a pipeline. According to the utility model, the ultraviolet light catalytic reactor and the titanium dioxide photocatalyst are utilized to decompose combustible gas or harmful impurities; a filter is used for filtering gas exhausted from the explosion heat bomb, solid particles on the gas are intercepted, after gas replacement is finished, a sixth electromagnetic valve and a fifth electromagnetic valve are opened, a gas adding pump and a gas extracting pump are started at the same time, gas generated by the gas adding pump blows up the solid particles attached to the top and the bottom of a filter plate, and the solid particles on the gas are removed. And blown solid particles are sucked away by using the sucking pump, so that the cleanliness of the interior of the filter is improved.

The invention provides a method for preparing a dopamine-coated titanium dioxide photocatalyst based on a hydrothermal method, which comprises the following steps: dispersing titanium dioxide powder in deionized water, and carrying out ultrasonic treatment to obtain a uniform titanium dioxide suspension; dissolving a buffer agent in deionized water to prepare a buffer solution, or directly adopting an alkaline solution to adjust the pH value of the titanium dioxide suspension to 7.5-10.0; dopamine hydrochloride is added into the titanium dioxide suspension liquid with the pH value adjusted, stirring is conducted till dopamine is fully dispersed, and a mixed precursor solution is obtained; transferring the mixed precursor solution into a hydrothermal reaction kettle for reaction; after the reaction is finished, naturally cooling to room temperature, collecting a reaction product, and centrifuging, washing and drying to obtain a titanium dioxide photocatalyst coated with polydopamine; by constructing a polydopamine-titanium dioxide core-shell structure, the coupling of adsorption enrichment and photocatalytic degradation is realized, and the purification efficiency of the catalyst on volatile organic compounds in a visible light environment in a cabin is improved.

This invention provides an AgBi alloy-modified titanium dioxide photocatalyst, its preparation method, and its application, belonging to the field of materials preparation technology. The AgBi alloy-modified titanium dioxide photocatalyst provided by this invention includes a titanium dioxide support and AgBi alloy loaded on the surface of the titanium dioxide support. x Bi y Alloy. Experimental studies have shown that the AgBi alloy-modified titanium dioxide photocatalyst can significantly reduce the types of byproducts in the CO2-CH4 conversion, while significantly improving the selectivity and formation rate of CH4.

The invention belongs to the technical field of air purification functional materials, and relates to a degradable particulate matter and VOCs protective laminated cellulose paper-based material and a preparation method thereof. The material comprises a physical adsorption layer, a catalytic decomposition layer and a chemical adsorption layer, the physical adsorption layer is a paper-based material formed by compounding cellulose fibers and montmorillonite, the catalytic decomposition layer is a paper-based material formed by compounding cellulose fibers and titanium dioxide, and the chemical adsorption layer is a paper-based material formed by modifying cellulose fibers through amino silane. The physical adsorption layer not only preliminarily adsorbs the VOCs, but also prolongs the residence time of the VOCs in the catalytic layer, and provides more sufficient conditions for photocatalytic reaction. Then, VOCs enter a catalytic decomposition layer and are efficiently degraded into harmless substances under the action of a titanium dioxide photocatalyst. The photocatalytic reaction efficiency and the overall removal rate of VOCs are remarkably improved, and meanwhile, the problem of incomplete catalysis caused by too fast airflow is solved.

The application discloses a kind of stable crystal form photocatalyst and its preparation method, application, belong to photocatalyst technical field, the catalyst is 1-ethyl-3-methyl imidazole tetrafluoroborate ion liquid assisted La doped TiO2 Photocatalyst, La doping ratio 0.12-0.13%, ion liquid content 12-13 mL / mg.It is prepared using sol-gel method, by precisely controlling A, B liquid ratio and 595-605 DEG C, 1.8-2.2h calcination process, realize lattice defect controllable and crystal form stable.When applied, the mass ratio of catalyst and rhodamine B is 99-101:1, and rhodamine B in wastewater can be efficiently degraded under illumination for ≥80 min, with a degradation rate of ≥92%.The degradation rate is still ≥88% after being reused for 5 times.The catalyst has stable crystal form, high photocatalytic efficiency, environmental protection and economy, and is suitable for treating wastewater containing rhodamine B in multiple industries.

This invention discloses a method for preparing a silver-cobalt bimetallic single-atom supported titanium carbide / titanium dioxide photocatalyst and its application in the selective photocatalytic reduction of carbon dioxide to methane. The method uses layered titanium carbide (Ti3C2 MXene) as a substrate, utilizing its abundant titanium vacancies to achieve in-situ anchoring of silver and cobalt atoms under mild conditions, obtaining atomically dispersed Ag and Co bimetallic single-atom active sites. Subsequently, a titanium dioxide (TiO2) layer is grown in-situ on the Ti3C2 MXene surface through hydrothermal treatment, constructing a tightly coupled Ti3C2 / TiO2 heterostructure, thereby forming a bimetallic single-atom photocatalytic interface with a synergistic effect. The prepared photocatalyst is applied for the first time in the field of photocatalytic carbon dioxide reduction, exhibiting excellent carbon dioxide photoreduction performance under visible light irradiation without sacrificial reagents, and showing high selectivity and a high methane formation rate. The preparation process of this invention is simple and highly controllable, and the obtained bimetallic single-atom photocatalyst provides a new catalyst design concept and technical solution for the high-selectivity conversion of carbon dioxide and the development of related new energy technologies.

The present invention relates to a photocatalyst and a preparation method therefor. The photocatalyst according to the present invention comprises titanium dioxide with a bronze crystal phase and an anatase crystal phase so as to have high photoactivity, and thus is suitable for removing odors and toxic gases. In addition, the titanium dioxide included in the photocatalyst, according to the present invention, has a novel crystal phase having a charge separation effect superior to those of other crystal phases, and thus has improved photoactivity. Additionally, the photocatalyst of the present invention has high photoactivity, and thus is suitable for removing odors and toxic gases. In addition, the photocatalyst of the present invention has excellent durability against catalytic poisons formed on the surface of a catalyst during removal of VOCs and toxic gases (acetaldehyde, isovaleraldehyde, isovaleric acid and toluene).

The application discloses a corn straw modified titanium dioxide photocatalyst, a preparation method and application thereof. The preparation method comprises the following steps: (1) crushing corn straw, calcining the crushed corn straw, and obtaining calcined corn straw; (2) mixing the calcined corn straw, ethanol and water to obtain a mixed solution A; mixing tetrabutyl titanate, glacial acetic acid and ethanol to obtain a mixed solution B; adding the mixed solution A into the mixed solution B to react, and then standing to obtain a gel; wherein the mass ratio of the corn straw to the tetrabutyl titanate is 0.05-0.15:100; wherein the mass of the tetrabutyl titanate is calculated based on the mass of completely formed titanium dioxide; (3) drying the gel to obtain a dry gel; and calcining the dry gel to obtain the corn straw modified titanium dioxide photocatalyst. The modified titanium dioxide photocatalyst can be used for degrading organic dye sewage, and can effectively degrade methyl violet in particular.

The invention discloses a BiOCl / TiO2 photocatalyst prepared by an electrochemical method as well as a preparation method and application thereof, and the preparation method of the BiOCl / TiO2 photocatalyst comprises the following steps: 1) placing a Ti sheet subjected to surface pretreatment in an aqueous solution containing F <-> for anodic oxidation, and then placing the Ti sheet in a muffle furnace for heat treatment to obtain an anatase type TiO2 nanotube; 2) taking the TiO2 nanotube as a working electrode, and obtaining Bi nanocrystals in a water solution containing Bi (NO3) 3 with a certain concentration, lignin calcium benzenesulfonate and an emulsifier OP-10 by adopting a pulse electrodeposition method; 3, the sample with the Bi nanocrystals deposited is subjected to electrooxidation in a Cl <-> solution under the specific pH condition, and the BiOCl / TiO2 photocatalyst is obtained.The BiOCl / TiO2 photocatalyst prepared through the electrochemical method has the advantages of being stable in structure, high in CO2 photocatalytic reduction activity and high in product selectivity.

The application discloses an air water making direct drinking machine, which comprises a filter part, the filter part comprises a first activated carbon filter layer, a second activated carbon filter layer, a nano Ag + coating layer, a TiO2 photocatalyst filter screen and an ultraviolet light emitting device, one side of the first activated carbon filter layer is provided with the nano Ag + coating layer without gap, one side of the nano Ag + coating layer is provided with the TiO2 photocatalyst filter screen without gap, one side of the TiO2 photocatalyst filter screen is provided with the second activated carbon treatment layer with gap, and the ultraviolet light emitting device is arranged in the gap; the application further discloses a preparation process of the filter part and an air water making direct drinking machine adopting the filter part. By tightly pressing the activated carbon treatment layer, the nano Ag + coating layer and the TiO2 photocatalyst filter screen together, the gap between different layers is cancelled, the nano Ag + coating layer is sprayed on the TiO2 photocatalyst filter screen in a certain thickness, bacteria and viruses are attached to the nano Ag + coating layer at the same time, and the bacteria and viruses are killed by the nano Ag + coating layer and the TiO2 photocatalyst, and the killing effect is large and sufficient.

The application discloses a carbon-coated nitrogen-doped titanium dioxide photocatalyst for removing ammonia and a preparation method thereof. In the synthesis process, TiO2 is first subjected to crystal modification, nitrogen-containing substances such as ethylenediamine and urea are used as nitrogen sources, and nitrogen-doped TiO2 is first synthesized through a one-step solvothermal method. Then, the surface of the nitrogen-doped TiO2 is coated on the basis of the nitrogen-doped TiO2, organic substances are used as carbon sources, the organic substances and the N-doped TiO2 powder are fully mixed in an ethanol solution through mechanical stirring, and then the mixture is dried and finally calcined in a tube furnace under an inert gas atmosphere to obtain the photocatalyst. The photocatalyst can maintain a high NH3 removal rate for a long time, can obtain high N2 selectivity, can remove pollutants, and can reduce secondary pollution to the environment. The catalyst has low preparation and application costs, and can be applied to the photocatalytic oxidation removal of NH3 under room temperature conditions.

The utility model discloses a kind of ultraviolet catalytic oxidation devices, the device is equipped with helical flow guide plate extending along the axial direction of device, helical flow guide plate is equipped with the flow guide hole for water to pass through and the hole for ultraviolet lamp tube to pass through, ultraviolet lamp tube passes through the hole of flow guide plate, the hole inner wall is equipped with the reflection layer for reflecting ultraviolet;TiO2 photocatalyst coating is equipped on the flow guide plate.Compared with the ultraviolet catalytic oxidation device (only including multiple ultraviolet lamp tubes extending along the axial direction of cylinder in reaction cavity) in the prior art, the utility model can effectively increase the turbulence degree of water in reaction cavity and most of water flow can flow from the surface of ultraviolet lamp tube, so that the mixing degree of strong oxidizing free radicals and water body increases in short time, most of organic matter in water body can contact strong oxidizing free radicals, so as to improve the degradation effect of free radicals on organic matter.

The application discloses a hydrophobic-photocatalytic composite cement material and a preparation method, and relates to the technical field of inorganic non-metallic materials, and comprises the following steps: S1, taking 89wt% of a silicate cement matrix, 10wt% of a TiO2 photocatalyst and 1.0wt% of a stearic acid hydrophobic agent according to the mass percentage; S2, the silicate cement, the TiO2 photocatalyst and the stearic acid hydrophobic agent are preliminarily mixed by mechanical stirring to obtain a mixture; S3, the mixture is added into a ball mill for ball milling modification, grinding balls with different diameters are matched according to a certain proportion, the rotating speed of the ball mill and the ball milling time are controlled, the overall hydrophobic property and the photocatalytic property of the composite cement material are endowed, and the hydrophobic-photocatalytic composite cement material is obtained after discharging. The application realizes the uniform dispersion of the TiO2 photocatalyst in the cement matrix through ball milling, and simultaneously makes the stearic acid hydrophobic agent fully dispersed in the cement particles, so that the overall hydrophobic property and the photocatalytic property of the composite cement material are endowed, instead of the local hydrophobic property and the photocatalytic property of the surface coating.

The present application belongs to the technical field of photocatalyst, and particularly relates to a titanium dioxide photocatalyst for treating aquaculture wastewater, which is prepared by dispersing a boron-silicon nonmetallic framework in a silicone solution through ultrasonic, adding a 10% sodium hydroxide solution dropwise to adjust the pH value, gradually adding titanium dioxide microsphere powder in the stirring process, and treating the product after a period of reaction, filtration, washing and drying to obtain a modified titanium-based photocatalyst. The titanium dioxide photocatalyst for treating aquaculture wastewater is prepared by taking the modified titanium-based photocatalyst as the main body, wherein the boron-silicon nonmetallic framework is prepared by the following steps: dispersing tributyl borate in a 10% acetone solution through ultrasonic, slowly adding a 1 mol / L tetraethyl orthosilicate solution dropwise, transferring to a high-pressure autoclave, and reacting under certain conditions to obtain the boron-silicon nonmetallic framework. The titanium dioxide photocatalyst for treating aquaculture wastewater prepared by taking the modified titanium-based photocatalyst as the main body can adapt to the complex environment in the aquaculture wastewater, is not prone to inactivation, and has a long service life.

The invention belongs to the technical field of photocatalysis, and particularly relates to an Ag quantum dot modified TiO2 photocatalyst and a preparation method thereof. The preparation method comprises the following steps: firstly, dissolving TiO2 in ethanol, ultrasonically stirring, then adding silver nitrate, completely dissolving, putting into a plasma reactor, applying voltage, discharging for a period of time, and centrifugally drying to obtain the Ag quantum dot modified TiO2 photocatalyst. The photocatalyst synthesized under the condition of 75% ethanol can completely degrade BPA.

The invention discloses a preparation method for preparing an F and La co-doped copper modified reduced titanium dioxide photocatalyst by adsorbing fluorine ions and copper ions at normal temperature and application of the F and La co-doped copper modified reduced titanium dioxide photocatalyst, the preparation method comprises the following steps: S1, mixing and calcining titanium dioxide microspheres, sodium borohydride and La2O3, cooling, washing and drying to obtain a La / TiO2-x composite material; s2, putting the La / TiO2-x composite material into fluorine-containing wastewater, and adsorbing fluorine ions at room temperature; s3, performing ultrasonic treatment, centrifugation, washing and drying on the material obtained in the step S2, and calcining to obtain an F-La / TiO2-x composite material; s4, carrying out a reaction on the F-La / TiO2-x composite material and 3-aminopropyltriethoxysilane, and then, carrying out centrifugal separation, washing and drying, so as to obtain an F-La / TiO2-x-NH2 composite material; and S5, adding the F-La / TiO2-x-NH2 composite material into copper-containing wastewater to adsorb copper ions, and then carrying out centrifugal separation, washing, drying and low-temperature calcination to obtain the F-La / TiO2-x-NH2-Cu photocatalyst. The obtained catalyst is excellent in performance.

The application discloses a bimetallic photocatalyst with titanium dioxide as a carrier, doping Fe and loading Pd, and a preparation method and application thereof. The bimetallic photocatalyst is prepared by the following steps: preparing a Fe-TiO2 modified carrier through a sol-gel method, and loading Pd through a sodium borohydride reduction method. The Pd / Fe-TiO2 photocatalyst obtained in the application has high degradation rate, high mineralization rate and high stability in the process of photocatalytic degradation of toluene, and the preparation method is simple and easy to implement, so the application has a good application prospect in the terminal treatment process of photocatalytic VOCs oxidation and degradation.

The subject invention pertains a stable, three-dimensional (3D) photocatalyst composition comprising TiO2 doped with carbon derived from lignin. The photocatalyst composition has a stable, hollow, spherical or spheroid nanoparticle structure, which improves photodegradation under visible light irradiation over unmodified TiO2 photocatalysts. The subject invention also provides methods of preparing the photocatalyst, as well as methods using the photocatalyst to remediate contaminants such as pharmaceuticals, pathogens and persistent organic pollutants.

The application discloses a method for preparing Yb-doped TiO2 photocatalyst by a high-pressure assisted sol-gel method, and Yb-doped TiO2 photocatalyst is prepared by the high-pressure assisted sol-gel method. The prepared Yb-TiO2 photocatalyst is in an anatase phase crystal form, has good crystallinity and dispersibility, has a larger specific surface area, has more active sites for surface reaction, and has a higher content of hydroxyl groups on the surface of the catalyst than that of intrinsic TiO2, so that the prepared Yb-TiO2 photocatalyst has good photocatalytic activity and stability.

The invention relates to a rare earth modified titanium dioxide photocatalyst, an optical diffusion plate sterilization coating liquid and a preparation method thereof, the rare earth modified titanium dioxide is nano titanium dioxide with an anatase crystal structure, the crystal lattice of the rare earth modified titanium dioxide is doped with rare earth elements, and the rare earth elements are selected from one or more of lanthanum, cerium, samarium, europium, neodymium and yttrium. According to the application, the rare earth modified titanium dioxide is added into the sterilization coating liquid, so that the prepared sterilization coating accidentally obtains efficient photocatalytic sterilization activity and photocatalytic degradation resistance under the indoor visible light condition.

The invention discloses a high-entropy alloy (HEA) / TiO2 photocatalyst for photo-assisted activation of hydrogen peroxide (H2O2) to efficiently degrade ciprofloxacin hydrochloride and a preparation method thereof, and the preparation method comprises the following steps: by taking tetrabutyl titanate, hydrofluoric acid and at least one of ferric salt, cobalt salt, nickel salt, manganese salt, molybdenum salt, lanthanum salt, aluminum salt and vanadium salt as raw materials, respectively synthesizing HEA and TiO2 through a hydrothermal reaction method; and then, the HEA is loaded on the TiO2, so that the HEA / TiO2 nano particles are prepared. The preparation steps are clear, the repeatability is good, and the obtained catalyst shows an excellent degradation effect in degrading ciprofloxacin through photo-assisted activation of H2O2.

The invention relates to the technical field of semiconductor processing, in particular to a chemical mechanical polishing solution based on a Bi-CaZnOS mechanoluminescent catalyst, a catalytic performance verification method and application of the chemical mechanical polishing solution in SiC chip polishing. The polishing solution comprises a Bi-CaZnOS mechanoluminescent material, a TiO2 photocatalyst and a dispersion medium, wherein the mass ratio of the Bi-CaZnOS mechanoluminescent material to the TiO2 photocatalyst is (1.5-3.5): 1, the signal-to-noise ratio is improved by innovative material design and Li < + >-assisted Bi < 3 + >-doped CaZnOS mechanoluminescent material, the emission wave band is regulated and controlled to a 480-500nm blue-green visible light region, the luminous intensity is improved by about 3 times compared with that of the material reported in the existing literature, meanwhile, the preparation temperature is reduced to 990 DEG C, and the preparation cost is reduced. And compared with the traditional process (1200 DEG C), the energy consumption and the environmental pollution are obviously reduced.

The application discloses a method for preparing a La-doped TiO2 photocatalyst by a high-pressure assisted sol-gel method, and the La-doped TiO2 photocatalyst is prepared by a high-pressure assisted sol-gel reaction method. The prepared Yb-TiO2 photocatalyst is in an anatase phase crystal form, has good crystallinity and dispersibility, has a larger specific surface area, has more active sites for surface reaction, and has a higher content of hydroxyl groups on the surface of the catalyst than that of intrinsic TiO2, so that the prepared La-TiO2 photocatalyst has good photocatalytic activity and stability. Through structural analysis of the La-TiO2 photocatalyst, it can be found that the specific surface area of the La-TiO2 is obviously larger than that of the intrinsic TiO2.

The present invention relates to a photocatalyst and a preparation method therefor. The photocatalyst according to the present invention comprises titanium dioxide with a bronze crystal phase and an anatase crystal phase so as to have high photoactivity, and thus is suitable for removing odors and toxic gases. In addition, the titanium dioxide included in the photocatalyst, according to the present invention, has a novel crystal phase having a charge separation effect superior to those of other crystal phases, and thus has improved photoactivity. Additionally, the photocatalyst of the present invention has high photoactivity, and thus is suitable for removing odors and toxic gases. In addition, the photocatalyst of the present invention has excellent durability against catalytic poisons formed on the surface of a catalyst during removal of VOCs and toxic gases (acetaldehyde, isovaleraldehyde, isovaleric acid and toluene).

The invention discloses a preparation method and application of an F and La co-doped reduced titanium dioxide photocatalyst by using fluorine-containing wastewater as a fluorine source and adsorbing fluorine ions at normal temperature, the preparation method comprises the following steps: S1, mixing and calcining titanium dioxide microspheres, sodium borohydride and La2O3, cooling, washing and drying to obtain TiO2-x / La; s2, placing TiO2-x / La in the fluorine-containing wastewater, and performing stirring treatment at room temperature for 1-24 hours to adsorb fluorine ions; and S3, carrying out ultrasonic treatment on the material obtained in the step S2 for 15-30 minutes, centrifuging, washing, drying, and calcining in a nitrogen atmosphere at 300-400 DEG C for 1-2 hours to obtain the F and La co-doped reduced titanium dioxide photocatalytic material. According to the method, the fluorine-containing wastewater is used as a fluorine source, fluorine ions are effectively introduced into the TiO2-x material through an adsorption-conversion process, the recycling of the fluorine ions in the wastewater and the preparation of a functional material are coordinated and unified, the dosage is small, and the catalytic efficiency is high.

A method of increasing growth of a plant, the method comprising applying a titanium dioxide photocatalyst to a surface of the plant, and converting nitrogen monoxide or nitrogen dioxide to nitrate on the surface of the plant.

The invention belongs to the technical field of photocatalysis and carbon dioxide resource utilization, and relates to a preparation method of an oxygen-resistant NiAu alloy nano-cluster loaded titanium dioxide photocatalyst and application of the oxygen-resistant NiAu alloy nano-cluster loaded titanium dioxide photocatalyst in carbon dioxide reduction in an oxygen-containing atmosphere. The method comprises the following steps: dispersing a TiO2 carrier, adding Ni and Au precursors, and carrying out photo-reduction to form a NiAu alloy nano-cluster precursor; the precursor is placed in a Fe < 3 + > acid solution for directional etching, Ni atoms on the surface layer are selectively removed, Au sites are exposed, and the oxygen-resistant NiAu-TiO2 photocatalyst with the surface rich in Au is obtained. According to the catalyst, CO2 is activated through Ni sites, O2 adsorption is inhibited through an Au-rich surface layer, and efficient Ni-Au synergy is achieved. In an atmosphere containing 5% of O2, the CO generation rate can reach 375.5 [mu] mol.g <-1 >. H <-1 >, the selectivity is close to 100%, and high activity and stability are maintained in simulated flue gas. The process is simple, the precious metal utilization rate is high, and an effective solution is provided for direct photocatalytic conversion of CO2 in oxygen-containing industrial waste gas.

This invention provides a visible light responsive titanium dioxide photocatalyst, its preparation method, and its application. The photocatalyst has a core-shell structure or a heterojunction interface structure and includes the following components: matrix material: modified nano-titanium dioxide; modifying material: chiral carbon quantum dots; the chiral carbon quantum dots are grown in situ or grafted onto the surface of the matrix material through Ti-O-C chemical bonds or strong electrostatic interactions; the photocatalyst utilizes the spin filtering effect generated by the CISS effect of the chiral carbon quantum dots, so that the photogenerated electrons injected into the matrix and the remaining holes are in a spin-forbidden state, thereby inhibiting recombination; this invention uses physical laws rather than simple energy level matching to inhibit recombination, significantly improving the quantum efficiency; the long-lived electrons and holes can continuously generate active free radicals, effectively overcoming the difficult-to-degrade VOCs containing benzene ring structures such as toluene, and reducing the generation of intermediate products; the raw materials used are all inexpensive chemical products, free from heavy metal pollution, and suitable for large-scale industrial production.