13 results about "Tio2 photocatalyst" patented technology

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 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 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 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 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 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).

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.

The application discloses a method for preparing Yb-La co-doped TiO2 photocatalyst by a high-pressure assisted sol-gel method, and Yb-La co-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-La-TiO2 photocatalyst has very good photocatalytic activity and stability. Through structure analysis of the Yb-La-TiO2 photocatalyst, it can be found that the specific surface area of the Yb-La-TiO2 is obviously larger than that of the intrinsic TiO2. It can be seen that the larger the specific surface area is, the more the active sites for surface reaction are, and the more favorable the improvement of the photocatalytic performance is.