52results about How to "High visible light activity" patented technology

The invention discloses a preparation method of BiVO4-BiOBr photocatalyst has a visible-light response, wherein the catalyst may be used under visible light, ultraviolet light, or sunlight. The preparation method of BiVO4-BiOBr photocatalyst that is in a multilevel nest-like nanostructure and is formed by nanosheets is: heating for 8 to 24 h under an alcohol-heating temperature of 100 to 200 DEG C with pH of 5 to 10. The catalyst of the invention can decompose water-soluble organic pollutant containing chlorine and sulfur, water-soluble organic pollutant of azo, xanthene, and anthraquinone type, and biological contaminant microcystic toxins generated by harmful algal bloom.

The invention relates to a preparation method and application of a novel photocatalysis material. On the basis of the action principle of semiconductor heterojunction, bismuth oxyhalide and titanium dioxide are composited to obtain a novel titanium based photocatalysis material with the characteristics of high catalytic activity, wide applicability and good stability. The preparation method adopted by the invention is simple and efficient and is easy to implement, and the use amount of the bismuth oxyhalide is less and is about 1-3%, therefore no increase of overmuch cost may be caused. The photocatalysis material obtained by the reaction is a porous nano particle with larger specific surface area, good dispersibility and high degree of crystallinity. In addition, the photocatalytic activity of the bismuth oxyhalide/titanium dioxide composite photocatalyst is very excellent, and either under ultraviolet or visible light irradiation, the bismuth oxyhalide/titanium dioxide composite photocatalyst can show high degradation performance both on gas phase and liquid phase organic matters.

The invention discloses a preparation method and application of a heterojunction MOF (Metallic Organic Framework) catalyst with magnetic recycling. The preparation method comprises the following steps: (1) respectively uniformly dispersing 2-methylimidazole, terephthalic acid and ferric chloride into N,N-dimethyl formamide so as to obtain uniform solutions; (2) uniformly mixing and stirring the obtained 2-methylimidazole solution and the terephthalic acid solution, and adding a Fe<3+> solution one droplet by one droplet; (3) carrying out hydrothermal treatment on a precursor solution, and carrying out washing, vacuum drying and grinding in sequence, thereby obtaining the heterojunction MOF catalyst. The heterojunction MOF catalyst disclosed by the invention is capable of improving catalysis performance and stability of an independent ligand MOF, is low in raw material price, has certain magnetism, is easy to recycle and has very high economic benefits.

The invention discloses a preparation for a silver phosphate nano ball-graphene composite material and photocatalysis application. The silver phosphate nano ball-graphene composite material is formed by in-situ growth silver phosphate nano balls decorated on the surface of graphene. In the composite material, the ratio of silver phosphate nano balls and the graphene is 100-25 milligram graphene oxide and the surface growth silver phosphate nano balls are 0.33 millimoles. The preparation method comprises steps of dissolving bovine serum albumin to distilled water, gradually dropping a silver nitrate solution, dropping a graphene oxide solution after a white colloid solution is formed, stirring for 2 hours, dropping a disodium hydrogen phosphate solution, stirring for four hours, conducting centrifugation, washing by using the distilled water, drying and obtaining the silver phosphate nano ball-graphene composite material. The composite material can serve as a visible-light-induced photocatalyst, and a photocatalysis experiment proves that the composite material has good visible-light catalytic activity. The preparation is simple and large-scale production can be achieved.

The invention discloses an Ag-MoS2@TiO2 nano photocatalytic sterilization material and a preparation method thereof. Chitosan is applied to the reaction of nano titanium dioxide, molybdenum disulfideand silver ions, so that the prepared Ag-MoS2@TiO2 nano material keeps a good in-situ dispersion characteristic, the catalytic efficiency of titanium dioxide in natural light is improved, and an excellent sterilization effect is achieved. According to the method disclosed by the invention, a MoS2 lamella is opened by using high-frequency and high-energy ultrasonic treatment, and MoS2 can be crushed at 110-140 DEG C, so that MoS2 small molecules subjected to fault crushing can be doped into nano titanium dioxide crystals. The Ag-MoS2@TiO2 nano material prepared by the method disclosed by the invention is uniform in size, good in dispersity, good in photocatalysis effect and good in sterilization effect.

The invention discloses a method for preparing a visible-light-active TiO2/Cu2S composite photocatalyst for removing Cr from water. According to the method, the TiO2/Cu2S composite photocatalyst with high visible-light activity is prepared by adopting an ultrasonic assisted solvothermal method in a manner of taking titanium tetrachloride as a titanium source and taking cuprous sulfide as a composite modifier. During experimentation, a feasible and effective anti-coating coupling method is adopted and is assisted by an ultrasonic stripping means, so that the structural stability of the composite catalyst is guaranteed, and meanwhile, the composite catalyst can have relatively high photocatalytic activity to Cr(VI). The obtained TiO2/Cu2S composite photocatalyst can be used for reducing a heavy metal Cr (VI) in the water into Cr (III), then, Cr (III) is converted into insoluble Cr(OH)3 which is attached to the surface of the catalyst, and thus, the aim of thoroughly purifying the water is achieved, so that the composite photocatalyst has a broad application prospect in the removal of similar heavy-metal pollutants from industrial water.

The invention discloses a preparation method of a visible light compound photocatalyst and a finishing method of cotton fabric by use of the visible light compound photocatalyst. The preparation method comprises steps as follows: step 101), preparing self-doped tin dioxide; step 102), preparing a visible light compound photocatalyst by use of graphene oxide and self-doped tin dioxide; step 103), performing a carboxylation reaction on the prepared visible light compound photocatalyst, and preparing a carboxylic visible light compound photocatalyst. The visible light compound photocatalyst has high efficiency and high activity, and the cotton fabric has efficient and durable anti-ultraviolet, anti-static, antibacterial and self-cleaning performance after being finished with the visible lightcompound photocatalyst.

The invention discloses three-atom-doped titanium dioxide catalyst as well as a preparation method and application of the three-atom-doped titanium dioxide catalyst, belonging to the technical field of catalysis and indoor air pollution prevention and control. The three-atom-doped titanium dioxide is composed of titanium dioxide crystals comprising nitrogen atoms, vanadium atoms and silicon atoms, having a crystalline form of anatase or a mixed crystalline of anatase and rutile, and having a particle size being 2-20nm, wherein the molar ratio of nitrogen to vanadium to silicon to titanium is (14-56): (0.1-2): (3-16):100, the specific surface area is 70-90m<2>/g, the energy gap is 2.8-3.0ev, and the absorption wavelength is 380-500nm. According to the invention, based on the nitrogen-vanadium-doped titanium dioxide photocatalyst, three-atom-doped titanium dioxide photocatalyst is prepared by using a sol-gel method, the superficial area and pore volume of the product are improved, and the product has catalytic activity under visible light. The preparation method is simple, the reaction process is easy to control, and side reactions hardly occur.

The invention discloses a preparation method of an indoor high-efficient formaldehyde removal agent. The preparation method comprises the following steps: adding 4 to 10 parts by weight of triethylenetetramine and 5 to 12 parts by weight of diethylenetriamine into deionized water, stirring for 5 to 10 minutes, adding 0.2 to 2 parts by weight of modified titanium dioxide, uniformly stirring, and obtaining suspension a; and soaking 80 to 120 parts by weight of modified active carbon, 5 to 15 parts by weight of tourmaline, 4 to 15 parts by weight of bentonite, 10 to 25 parts by weight of attapulgite, and 10 to 18 parts by weight of sepiolite in the suspension a, drying, thus obtaining the indoor high-performance formaldehyde removal agent. The indoor high-performance formaldehyde removal agent prepared by the method of the invention is excellent in formaldehyde removal performance, and by virtue of test, the formaldehyde degradation rate in 24 hours reaches 99 percent or above.

The invention relates to a preparation method and an application of an activated carbon doped titanium dioxide nano photocatalyst. The preparation method comprises the following steps of: (1) uniformly mixing absolute ethyl alcohol, glacial acetic acid and butyl titanate in a volume ratio, adding an ethyl alcohol aqueous solution into the mixed solution drop by drop, and conducting stirring for later use; (2) dissolving dried activated carbon into ultrapure water, performing centrifugal separating, taking out an upper-layer liquid and dropwise adding the upper-layer liquid into the solution prepared in the step (1) drop by drop, and performing stirring for later use; and (3) transferring the solution prepared in the step (2) into a microwave reactor to be subjected to a microwave reaction, performing centrifugal separating after the microwave reaction is ended, cleaning the obtained solid, and performing drying and grinding to obtain the activated carbon doped titanium dioxide nano photocatalyst. The activated carbon doped titanium dioxide nano photocatalyst prepared by the preparation method has the characteristic of remarkably absorbing visible light, has relatively high photocatalytic activity, and can be applied to degrading organic pollutants in water.

The invention discloses a method for preparing a rare-earth ion doped titanate nanotube, relating to doping through ion exchange. The titanate nanotube has high visible light activity. The technical scheme is as follows: the method comprises a method for preparing the titanate nanotube by a hydrothermal method and is characterized by (1) putting 1 part by weight of titanate nanotube into rare-earth ion aqueous solution, stirring the mixture at room temperature until ion exchange equilibrium is achieved, then washing the mixture with deionized water and drying the mixture to remove the moisture, wherein the concentration of the rare-earth aqueous solution is 0.01-0.5M; and (2) calcining the doped titanate nanotube prepared in the step (1) at 300-1000 DEG C to prepare the rare-earth ion doped titanate nanotube. The method is used for doping the titanate nanotube.

The invention discloses a preparation method of MoS2 quantum dot loaded nano TiO2, which applies chitosan to the reaction of nano titanium dioxide and molybdenum disulfide, so that the prepared MoS2@TiO2 nano material keeps good in-situ dispersion characteristic, and the catalytic efficiency of titanium dioxide in natural light is improved. According to the method disclosed by the invention, a MoS2 lamella is opened by using high-frequency and high-energy ultrasonic treatment, and MoS2 can be crushed at 110-140 DEG C, so that MoS2 small molecules subjected to fault crushing can be doped into nano titanium dioxide crystals. The preparation method of the MoS2 quantum dot loaded nano TiO2 is simple and convenient to operate, easy to implement, short in consumed time, low in consumption, low in cost, high in yield, good in repeatability and suitable for large-scale production or does not cause secondary pollution to the environment.

The invention discloses a method for introducing fluorine ions into ZnMoO4 by a hydrothermal method. The method comprises the following steps: a, weighing molybdenum trioxide, dissolving themolybdenumtrioxide in deionized water, weighing zinc fluoride tetrahydrate, and adding into the obtained aqueous molybdenum trioxide solution; b, transferring a mixed solution obtained in step a into a reaction kettle, and carrying out a hydrothermal reaction for 12-24 hours at the temperature of 200-201 DEG C to obtain a yellow product; and c, repeatedly and centrifugally washing the yellow product obtained in step b with deionized water and ethanol, carrying out vacuum drying for 6-12 hours at the temperature of 50-80 DEG C, and grinding into powder to obtain ZnMoO4: F. According to the ZnMoO4: F material prepared by the invention, XPS, TG and the like prove that a certain amount of fluorine ions exist in crystal lattices, and the ZnMoO4: F material has visible light adsorption. The method disclosed by the invention exceeds the traditional method for preparing the fluorine-containing compound by using dangerous reactants such as HF and PVDF, and is a non-toxic and simple preparation method.

The invention discloses a dibenzo fused dinaphthyl polymer photocatalyst for hydrogen production by photocatalytic decomposition of water and a preparation method thereof, the photocatalyst is prepared by a simple binary or ternary copolymerized Suzuki coupling reaction, and the construction unit of the photocatalyst comprises dibenzo fused dinaphthyl and dibenzothiophene sulfone. The dibenzo fused dinaphthyl monomer and the dibenzothiophene sulfuryl monomer for polymerization have the same or different polymerizable functional groups, and can be subjected to Suzuki coupling reaction. The polymer photocatalyst has the characteristics of high photocatalytic hydrogen production activity, high apparent quantum efficiency and continuous and adjustable structure and composition, is simple in preparation process, high in yield and stable in performance, can release hydrogen under sunlight, and can be used in the field of photocatalytic hydrogen production.