234results about How to "Visible light catalytic activity is high" patented technology

The invention discloses a TiO2@ graphite phase carbon nitride heterojunction composite photocatalyst and a preparation method thereof. The catalyst has a structure of a core made of TiO2 nanoparticles and a shell made of a graphite phase carbon nitride layer. The preparation method comprises the following steps: a) preparing TiO2 nanoparticles coated by Melem by hydro-thermal reaction; and b), washing, separating, drying and calcining the TiO2 nanoparticles to obtain the TiO2@ graphite phase carbon nitride heterojunction composite photocatalyst. The invention has the advantages that: the method is simple, low in cost and suitable for large-scale industrial production; and the composite photocatalyst has high visible light response activity and stability and can be widely used in fields such as photocatalysis and photoelectric conversion.

The invention relates to a BiOI-graphene visible light catalyst and a preparation method thereof, belonging to the technical field of inorganic material synthesis and photocatalysis. BiOI and graphene are in the shape of a slice, and the graphene is 1.0%-3.0% by weight. The preparation method of the BiOI-graphene visible light catalyst comprises the following steps of: firstly ultrasonically dispersing graphite oxides into ethanol; then stirring, and adding a certain amount of sodium iodide or potassium iodide water solutions and bismuth nitrate glacial acetic acid solutions at the same time; transferring suspending liquid into a high-pressure reaction kettle with a polytetrafluoroethylene liner, and carrying out crystallization reaction at 120-150 DEG C for 6-12 hours; filtering, washing and drying obtain solid products so as to finally obtain the BiOI-graphene compound light catalyst. The preparation method has environment friendliness and simple process; and the prepared BiOI-graphene visible light catalyst has very high visible light catalytic activity and potential application value in a control technology decomposing organic pollutants by utilizing solar photocatalysis.

The invention provides a preparation method and use of a Bi2O3/Bi2O4 phase heterojunction photocatalyst. The preparation method comprises the following steps: firstly, mixing 2.8 g of bismuth salt with 0-1.87 g of alkali uniformly to prepare a paste; then, placing a mixture into a muffle furnace and calcining at 100-450 DEG C for 0.5-4.0 h; washing a calcined substance with deionized water; and drying at 60 DEG C to obtain earthy yellow to reddish brown solids which are the Bi2O3/Bi2O4 heterojunction photocatalyst. The Bi2O3/Bi2O4 phase heterojunction photocatalyst prepared in the invention isused for degrading organic pollutants in water, and has higher visible light catalyzing activity than a commercial Bi2O3 photocatalyst.

The invention discloses a method for preparing an AgX@g-C3N4 composite photocatalytic material. The method comprises the steps of: firstly treating g-C3N4 with a laminated structure in a silver salt solution under the action of ultrasound so that silver ions are loaded on the surface of the g-C3N4; and adding a halide salt solution to carry out precipitation reaction on the silver ions and halide ions, so as to obtain the AgX@g-C3N4 composite material. The method is low in cost, and simple and easy in preparation process and the visible photocatalytic activity of products is high.

The invention discloses a visible-light-induced photocatalyst Bi4O5Br2 and a preparation method thereof. According to the visible-light-induced photocatalyst Bi4O5Br2 and the preparation method thereof, an improved low-temperature hydrothermal method is adopted, composition of Bi, O and Br in BiOX is controlled by controlling amount of a bismuth source and a bromine source, and a novel layered-cake-shaped visible-light-induced photocatalyst Bi4O5Br2 is prepared successfully. The preparation method is simple in production process, easy to operate, low in synthesis temperature, high in reaction yield, environment-friendly and low in cost and meets the requirement of actual production, the reaction yield is 92%, and raw materials are easy to obtain. The visible-light-induced photocatalyst has good visible-light catalytic activity, can completely degrade various organic pollutants such as rhodamine b, methyl orange and methylene blue in short time under the visible light irradiation, is small in light corrosion and good in reusability, can be applied to industrial production and particularly has a better application value in organic pollutant degradation through solar photocatalysis, and the market potential is large.

The invention provides an alpha/beta-Bi2O3 phase heterojunction photocatalyst as well as a preparation method and application thereof. The method comprises the following steps: firstly dissolving 2-4mmol of a bismuth source material in 70mL of a reductive solvent, magnetically stirring for 30 minutes under the room temperature, then adding 0-2.0mL of aniline into the solution, and continuing to stir for 10 minutes; transferring the mixed solution into a reactor, putting the mixed solution in a drying oven for carrying out solvothermal reaction for 8-12 hours at the temperature of 150-180 DEG C to obtain a bismuth-based precursor; washing, drying and grinding the precursor, putting the precursor in a muffle furnace for calcining for 0.5-2.0 hours at the temperature of 300 DEG C to obtain yellowish green powder which is the alpha/beta-Bi2O3 phase heterojunction photocatalyst. The prepared alpha/beta-Bi2O3 phase heterojunction photocatalyst is used for degrading organic pollutants in water; compared with commercial TiO2 (P25), pure-phase alpha-Bi2O3 and pure-phase beta-Bi2O3 photocatalysts, the alpha/beta-bismuth oxide phase heterojunction photocatalyst has higher visible-light catalytic activity.

The invention discloses a synthetic method for high-activity N-F co-doped bismuth vanadate visible light photocatalytic material prepared through the citric acid complexation sol-gel method and a preparation process. The method employs Bi(NO3)3.5H2O(97%) and NH4VO3(98.5%) as source materials, citric acid(99.5%) as a chelating agent, NH4F as N and F sources, and utilizes ammonium hydroxide to regulate the pH value, and dark blue sol is prepared, dried, calcined to obtain the N-F co-doped bismuth vanadate photocatalytic material. When the material is compared to bismuth vanadate without being doped, because of the synergistic effects of N and F, oxygen vacancies and V4+ with catalytic activity are increased N-F co-doped bismuth vanadate crystals, the band-gap energy is narrower and the photocatalytic activity is raised obviously in visible light. The method is advantaged by simple process, mild conditions and good repeatability. The photocatalytic material can be widely used in photocatalytic degradation of organic pollutants, and has wide application prospects in environmental governance.

The invention discloses a preparation method and application of a novel visible light response compound photocatalyst for growth of ZnIn2S4 on the surfaces of TiO2 hollow spheres. The method can be applied to treatment of water body pollution. The method includes the following steps of ultrasonically dispersing the obtained TiO2 hollow spheres in water, and then preparing a ZnIn2S4/TiO2 nanometer compound hollow sphere photocatalyst through an in-situ hydrothermal method. The prepared ZnIn2S4/TiO2 nanometer compound hollow sphere photocatalyst can be used for catalyzing and degrading tetracycline hydrochloride, levofloxacin and methyl orange under visible light. The obtained ZnIn2S4/TiO2 nanometer compound hollow sphere photocatalyst can capture more visible light and has a matched band gap structure, photoelectron and hole separation efficiency can be improved, good interface contact promotes photoelectron transmission, and the visible light catalytic activity of the catalyst is remarkably improved.

The invention relates to a barium titanium iron series phhotocatalyst and a preparation method thereof, and belongs to the field of phhotocatalyst. In accordance with the chemical formula Bi5FeTi3O15, the invention adds titanium salt or titanate, malysite, bismuth salt into deionized water or acidic solution to dissolve and mix evenly, adds in aqueous alkali to produce settlings, and then adds the settlings into a water heat retort; after water heat reaction, the Bi5FeTi3O15 catalyst material is obtained after centrifugation, washing and drying. The invention reduces energy consumption of synthesization, and the product has even components, controllable grain size, quite high specific surface area, and good photocatalytic performance.

The invention discloses a method for preparing an effective Ti1-XO2-SnX/TiO2-X-NX nanometer compound film visible light catalyst and belongs to the technical field of photocatalysis. The invention takes titanic acid ester as a precursor, takes nitrogenous compounds and pink salt as dopant and adopts a sol-gel method for preparing the nanometer TiO2-based compound film with an adulterated heterogeneous interface p-n knot structure. The ultraviolet and visible light catalytic activities of the catalyst are all over the TiO2 film adulterated with N ion. The method has the following innovation points of: 1, the TiO2-based catalyst can generate high absorption of ultraviolet light and visible light by being adulterated with Sn and N ions; 2, the heterogeneous interface of the compound film of the catalyst forms a p-n knot energy band structure through the combination of Ti1-X O2-SnX and TiO2-X-NX, thus promoting the separation of a photo-generated carrier, improving the probability of the photo-generated carrier to participate in the photocatalysis reaction and effectively degrading pollutants.

The invention discloses a synthetic method for preparing nanometer cuprous oxide from nitrogen-doped cuprous oxide. The synthetic method comprises the following steps: a, preparing a copper sulfate solution and a urea solution; b, obtaining a solution A by uniformly mixing the copper sulfate solution obtained in step a with the urea solution obtained in step a according to a molar ratio of N:Cu of 0.002-0.04; c, adding an aqueous solution of ammonia to the solution A, fully stirring, adding a sodium hydroxide solution, adding hydrazine hydrate after that the color of the solution changes intoreseda from blue, and obtaining a solution B when the color of the solution changes into reseda from green; and d, stirring the solution B, carrying out pumping filtration on the solution B, and obtaining a finished product the nanometer cuprous oxide prepared from nitrogen-doped cuprous oxide by carrying out vacuum drying on a filter cake. The nanometer cuprous oxide is prepared with the synthetic method for preparing nanometer cuprous oxide from nitrogen-doped cuprous oxide of the invention, so the electron-hole recombination rate is substantially reduced, and the visible photocatalytic activity of the nanometer cuprous oxide is effectively improved.

A process for preparing the nanoparticles of phthalocyanine sensitized TiO2 by in-situ hydrothermal method includes such steps as perparing the precurse liquid of TiO2 nanoparticles, and adding phthalocyanine as sensitizer while preparing TiO2 nanoparticles in hydrothermal condition. Its advantages are high dispersity and stability, high visual light catalytic activity and broadband.

The invention discloses a rGO/Fe<3+>/g-C3N4 ternary composite photocatalyst. The rGO/Fe<3+>/g-C3N4 ternary composite photocatalyst is obtained by mixing an aqueous iron ion solution and tripolycyanamide, drying, grinding and calcinating to obtain an Fe-C3N4 photocatalyst, protonating the Fe-C3N4 photocatalyst, then mixing with graphene oxide, drying and calcinating. The invention further disclosesa preparation method of the rGO/Fe<3+>/g-C3N4 ternary composite photocatalyst. The preparation method comprises the following steps: (1), preparing the Fe-C3N4 photocatalyst: weighing a certain amount of iron salt, dissolving in deionized water, adding the tripolycyanamide, uniformly mixing, drying, calcinating, and cooling to obtain the Fe-C3N4 photocatalyst; (2), protonating the Fe-C3N4 photocatalyst; (3), dissolving graphene oxide powder in deionized water, ultrasonically dispersing, adding the protonated Fe-C3N4 powder, uniformly mixing, stirring, drying, grinding, and calcinating to obtain the rGO/Fe<3+>/g-C3N4 ternary composite photocatalyst.

The invention provides a preparation method and an application for a CdS/BiOI heterojunction photo-catalyst. The method comprises the following steps: firstly, respectively dissolving bismuth salt material and iodine source material in glycol, mixing the two solutions and stirring for 1h; transferring a mixed solution into a reaction kettle and reacting for 8-16h at 120-200 DEG C, thereby acquiring an orange red solid; washing, drying and grinding the orange red solid, thereby acquiring dry BiOI powder; dissolving cadmium salt in deionized water, adding BiOI powder and buffer salt in turn and increasing the temperature of the reaction system from room temperature to 30-90 DEG C; adding complexing agent into the system, dropwise adding 50ml solution containing sulfur source material into the system and stirring for 15min, thereby acquiring yellow sediment; and washing, drying and grinding the yellow sediment, thereby acquiring the yellow powder, namely, the CdS/BiOI heterojunction photo-catalyst. The CdS/BiOI heterojunction photo-catalyst prepared according to the invention is used for degrading the organic pollutants in water. Compared with the photo-catalysts, such as, commercial TiO2 (P25), pure phase CdS and pure phase BiOI, the catalyst has higher visible-light catalytic activity.

The invention discloses a GO (graphene oxide) and g-C3N4 composite modified membrane material. A preparation method includes steps: activating an original membrane to recover original membrane flux; adding a surfactant into GO and g-C3N4 mixed dispersion liquid to obtain mixed liquid; soaking the activated original membrane into the mixed liquid to realize ultrafiltration adsorption, and soaking the membrane into aniline hydrochloric acid solution; taking out after soaking is finished, and soaking in hydrochloric acid solution of ammonium persulfate immediately to enable interface polymerization reaction; finally, drying the membrane to obtain the composite modified membrane material. By an ultrafiltration adsorption and interface polymerization combined modification method, GO and g-C3N4are combined for surface composite modification of the membrane material, and a visible light responsive catalytic modified membrane is developed. The novel modified membrane is low in preparation cost and recyclable, pollution resistance is remarkably improved, firmness in modifying agent and photocatalyst loading is achieved, the visible catalytic performance and hydrophilic performance are remarkably enhanced, the forbidden bandwidth of a membrane function layer is decreased, the problem of secondary pollution is avoided, and a promising application prospect is achieved.

The invention relates to a preparation method of an Ag3PO4/BiVO4 heterojunction composite photocatalyst, and belongs to the technical filed of photocatalysis in environment treatment. The Ag3PO4/BiVO4 heterojunction composite photocatalyst is prepared through the steps of preparing BiVO4 and preparing an Ag3PO4/BiVO4 composite photocatalyst. Compared with Ag3PO4/BiVO4 heterojunction composite photocatalysts in the prior art, the product prepared in the invention has the advantages of combination of the stability of the BiVO4 photocatalyst with the high activity of Ag3PO4, maintenance of high visible photocatalytic activity, and reduction of the amount of the precious metal element silver.

The invention discloses a method for preparing novel carbon quantum dot/flower-shaped indium and calcium sulfide (CQDs/CaIn2S4) composite photocatalysts, and belongs to the field of environmental protection. The method includes preparing the CQDs/CaIn2S4 composite photocatalysts by the aid of in-situ hydrothermal processes at certain temperatures. The CQDs/CaIn2S4 composite photocatalysts prepared by the aid of the method can be applied to catalytically degrading tetracycline hydrochloride solution under the sunlight or visible light. The method has the advantages that the method includes simple technologies, is free of pollutant discharge in preparation procedures and is short in preparation period and low in energy consumption and cost, is a green synthesis technique, and the carbon quantum dot/flower-shaped indium and calcium sulfide composite photocatalysts can be prepared on a large scale; the visible light response and the adsorption capacity of the carbon quantum dot/flower-shaped indium and calcium sulfide composite photocatalysts can be improved after CQDs (carbon quantum dots) are compounded, the service lives of electrons-holes can be prolonged, photoelectron transmission can be promoted, and the visible light photocatalytic activity of the carbon quantum dot/flower-shaped indium and calcium sulfide composite photocatalysts can be greatly improved.

The invention provides a visible light response type nanosheet bismuth oxychloride catalyst and a preparation method thereof. The preparation method specifically comprises the following steps: adding bismuth nitrate pentahydrate to dilute hydrochloric acid, and stirring at room temperature until the bismuth nitrate pentahydrate is completely dissolved; adjusting the pH value of the solution to 2-8 with aqueous ammonia, and stirring at room temperature for 30min; filtering, washing and drying the prepared suspension (drying temperature is 100 to 180 DEG C, and drying time is 8h) to obtain the gray nanosheet bismuth oxychloride photocatalyst which is 100-200nm long and 50-150nm wide. Under the irradiation of visible light, a target pollutant, Rhodamine B (RhB) dye wastewater, is completely degraded within 10min in the presence of the catalyst. The method has the advantages of simple synthetic route and high catalyst yield and is suitable for industrial mass production, the catalyst is high in catalytic efficiency and recycle rate, and the synthetic process can be performed at room temperature without auxiliary equipment.