83results about How to "Wide photoresponse range" patented technology

The invention discloses a plasma-type tungsten oxide-modified graphite phase carbon nitride nanosheet composite photocatalyst and a preparation method and application thereof. The composite photocatalyst comprises a plasma-type tungsten oxide and a graphite phase carbon nitride nanosheet. The plasma-type tungsten oxide attaches to the surface of the graphite phase carbon nitride nanosheet. The plasma-type tungsten oxide is W18O49. The preparation method comprises mixing the graphite phase carbon nitride nanosheet and a tungsten hexacarbonyl solution to obtain a precursor mixed solution and preparing a composite photocatalyst through a hydrothermal reaction. The composite photocatalyst has the advantages of high photocatalytic activity, wide photoresponse range, stable photocatalytic performance and good recyclability. The preparation method has the advantages of simple processes, operation easiness and low cost. The composite photocatalyst can be used for treating antibiotic waste water, can be used through a simple method, realizes a low cost, has a high removal rate, effectively degrades antibiotics in waste water and has a good application prospect.

The invention discloses a metal coordination porphyrin-based conjugated polymer as well as a preparation method and application thereof in photocatalytic degradation of organic pollutants. The catalyst provided by the invention has an approximately planar macrocyclic molecule with a 18pi conjugated skeleton, a stable rigid structure and a very stable highly conjugated system, so that the catalysthas excellent photoelectric conversion efficiency, a wide absorption spectrum range, strong oxidation-reduction capability and good chemical and thermal stability, metal coordination porphyrin is usedas an active center, a large number of derivatives can be derived, and the method has important application value in the aspects of photocatalytic degradation of environmental pollutants and the like.

The invention provides a silver-silver phosphate-tungsten trioxide ternary composite nano photocatalytic material and a preparation method and application thereof, and belongs to the field of photocatalysis. Ag nanoparticles are loaded on the surface of Ag3PO4, the optical corrosion and decomposition of Ag3PO4 are effectively inhibited by utilizing a plasma resonance effect of the Ag nanoparticles, and thus stability of Ag3PO4 under illumination is guaranteed; introduction of WO3 can effectively inhibit recombination of photo-generated electron hole pairs, and the synergistic effect of Ag, Ag3PO4 and WO3 can effectively improve the photocatalytic performance of the composite material. The ternary composite nano photocatalytic material has the advantages of wide light response range and high quantum efficiency, and can be applied to the field of environmental protection, in particular to photocatalytic degradation of organic pollutants and photocatalytic sterilization.

The invention relates to nitrile substituted quinacridone compounds and application thereof in an organic solar cell. The compounds provided by the invention are quinacridone derivatives using nitrile substituted quinacridone as a basic structural skeleton or quinacridone derivatives using nitrile substituted 2, 9-thiophene quinacridone as a basic structural skeleton. The compounds provided by the invention can be used for preparing an organic solar cell with one or more than one active layer, and at least one layer of the active layers contains one or more than one compound provided by the invention. The active layer can be a light absorbing layer and/or a migrating layer and/or a charge injection layer. The filling factor of the bulk heterojunction solar cell device prepared by using the compounds provided by the invention is higher, and the spectral response range reaches 700nm; and the bulk heterojunction solar cell device is solution-processable, which is beneficial to industrial production.

The invention discloses a preparation method for a stannous methyl amino iodide-titanium dioxide visible light catalytic material. The preparation method comprises the following steps: 1) preparing ammonium methyl iodide; 2) preparing stannous iodide; 3) preparing stannous methyl amino iodide; 4) preparing the stannous methyl amino iodide-titanium dioxide visible light catalytic material: adding stannous methyl amino iodide and tetrabutyl titanate into normal hexane, mixing, heating and stirring at 70 DEG C for reaction under reflux, centrifugally separating turbid liquid by using a high speed centrifuge, adding into deionized water after centrifugal separation, magnetically stirring, filtering, washing and drying to obtain dry solid powder, and putting into a muffle furnace for roasting, thereby acquiring the methyl amino stannous iodide-titanium dioxide visible light catalytic material. The preparation method is simple and convenient in operation and low in cost; the photoproduction electron generated by the visible light catalytic material can quickly transfer to a TiO2 guide tape; the recombination rate of photoproduction electron and hole can be reduced; the separation of the photoproduction electron-hole on the material interface can be promoted; the visible light catalytic activity of the material is promoted.

The invention discloses a preparation method of halogen bismuth oxide nitrogen fixation photocatalysts with a three-dimensional structure. The preparation method comprises following steps: 1, a glucose aqueous solution is prepared; 2, hydro-thermal reaction, washing, centrifugation, and drying are carried out; 3, an obtained product is added into an acetic acid aqueous solution, and magnetic stirring is carried out; 4, Bi(NO3)3 5H2O is added, after complete dissolving, a halogeno salt of the same molar amount is added so as to obtain a brown precipitate; and 5, drying and sintering are carriedout so as to obtain the halogen bismuth oxide nitrogen fixation photocatalyst with a three-dimensional structure. According to the preparation method, template method is adopted to prepare a plurality of nitrogen fixation photocatalysts, preparation technology is simple, energy consumption is low, different halogeno salts can be adopted to prepare samples of a three-dimensional structure respectively, product purity is high, the morphology is uniform, the dispersibility is excellent, the performance is stable, and the circulation performance is excellent.

The invention discloses a bipyridyl ruthenium complex covalent functionalized graphene photo-catalyst in a structure shown as a formula (I) described in the abstract. In the formula (I), R represents -H, -COOH, -SO3H or -OCH3. Graphene, methyl glycocol and formyl pyridine serve as raw materials, and a graphene base ring addition intermediate compound is synthesized through a 1, 3-dipolar cycloaddition method; the intermediate compound and a bipyridyl ruthenium complex are synthesized through complexing reaction; in order to further improve the photo-catalysis hydrogen evolution activity of the catalyst, a certain amount of platinum nano-particles can be loaded on the bipyridyl ruthenium complex covalent functionalized graphene photo-catalyst as a catalyst promoter. The bipyridyl ruthenium complex covalent functionalized graphene photo-catalyst has the advantages of wide photo-response range, high hydrogen production activity of catalytic water decomposition, high stability, mild catalytic reaction conditions (normal temperature and normal pressure) and the like.

The invention discloses a carbon quantum dot modified bismuth tungstate/ordered macroporous fluorine-doped tin oxide composite photocatalyst, and a preparation method and application thereof, belonging to the technical field of photocatalysis of solar-photoelectrochemical conversion. The composite photocatalyst is prepared by preparing a fluorine-doped tin oxide film with a three-dimensional ordered porous space structure on a conductive substrate, allowing bismuth tungstate to grow on the film to prepare a bismuth tungstate/ordered macroporous fluorine-doped tin oxide composite film, soaking the bismuth tungstate/ordered macroporous fluorine-doped tin oxide composite film in a carbon quantum dot solution and carrying out vacuum drying. The carbon quantum dot-modified bismuth tungstate/ordered macroporous fluorine-doped tin oxide composite film has high specific surface area, high electrical conductivity and high photocatalytic activity, and can be used as a photoanode material for solar-photoelectrochemical conversion equipment. The preparation method of the invention has the advantages of simple process, mild reaction conditions, easy control, and good application prospects.

The invention relates to the technical field of photocatalytic coatings, particularly to a composite titanium dioxide photocatalytic active coating and a preparation method thereof. The preparation method comprises the following three steps: (1) preparing composite modified Ti02 powder; (2) preparing a composite Ti02 photocatalytic active emulsion; and (3) preparing an active coating. According tothe present invention, the prepared photocatalytic active coating has characteristics of high photocatalytic efficiency and wide photoresponse range, and can effectively solve the problems of difficult recovery, low photocatalytic efficiency, easy agglomeration and easy secondary pollution generation during photocatalytic reaction, and the like of the Ti02 powder catalyst; and the prepared titanium dioxide photocatalytic active coating can be reused so as to reduce the catalyst consumption, and further has broad market application prospects.

The invention relates to the field of synthesis of organic-inorganic hybrid chromogenic materials, in particular to a photochromic/thermochromic material based on a methyl nicotinic hydrazide-iodine cuprate hybrid and preparation of the photochromic/thermochromic material. An in-situ generated methyl nicotinic hydrazide cation is taken as a structure-directing agent for guiding synthesis of the iodine cuprate hybrid with photochromic and thermochromic properties. According to the invention, the methyl nicotinic hydrazide cation and an iodine cuprate anionic framework are taken an electron acceptor and donor respectively, one photochromic/thermochromic difunctional material based on the methyl nicotinic hydrazide-iodine cuprate hybrid is provided, so that variety and color of a conventional chromogenic material are enriched, and the blank in the technical field is filled up. The photochromic/thermochromic material can respond to ultraviolet light and visible light besides response to low temperature to produce reversible thermochromism, photochromism and achromatism speeds are high, the photoresponse range is wide, the chromogenic contrast is high, the chromogenic performance of the conventional material is greatly improved, and the application range of the chromogenic material is broadened.

The invention relates a controllable synthesis method of nonmetallic ion-doped nano titanium dioxide by a phase separation-hydrolysis solvothermal method, in particular to a synthesis method of nonmetallic ion-doped nano titanium dioxide, which solves the problems of low doping efficiency, complicated process, high cost and poor universality of the existing nonmetallic ion doping method of the nano titanium dioxide. The synthesis method comprises the following steps: 1, mixing tetrabutyl titanate with methylbenzene and then stirring to obtain an organic phase; 2, adding nonmetallic ion aqueous solution to a high-pressure reaction kettle, placing the organic phase into a U-shaped groove, placing the groove into the nonmetallic ion aqueous solution, covering, carrying out solvothermal treatment, cooling and filtering; and 3, drying by oil bath and then roasting to obtain the nonmetallic ion-doped nano titanium dioxide. The synthesis method of the invention has simple process, high doping efficiency, low cost and wide applicability; and the obtained nano titanium dioxide has high crystallization degree and good visible light catalytic activity, thus the nano titanium dioxide can be applied to visible light catalytic degradation of organic pollutants.

The invention discloses a recyclable flexible titanium dioxide/pyrolytic carbon/carbon fiber felt composite photocatalytic material as well as a preparation method and application thereof, and relates to the field of photocatalytic materials. The preparation method comprises the steps: soaking a carbon fiber felt in acetone, and drying to obtain a clean carbon fiber felt; heating the clean carbon fiber felt in an inert atmosphere, and depositing pyrolytic carbon at a high temperature in a methane atmosphere to obtain a pyrolytic carbon/carbon fiber felt; and evenly mixing acetone, ethylene glycol and tetrabutyl titanate to obtain a mixed solution, mixing the obtained pyrolytic carbon/carbon fiber felt and the obtained mixed solution for a hydrothermal reaction, cleaning and drying an obtained product after the reaction is finished, and preparing the recoverable flexible titanium dioxide/pyrolytic carbon/carbon fiber felt composite photocatalytic material. The problems that in the prior art, a TiO2-based traditional powder photocatalyst is low in solar energy utilization rate and not easy to recycle are effectively solved.

The invention relates to the field of optical catalysis, and further relates to a SnO2 modified fullerene composite material of a micro nano structure and a preparation method and an application thereof. The composite material comprises fullerene of the micro nano structure and SnO2, wherein the micro nano structure serves as a main body and SnO2 is loaded to the surface of fullerene of the micronano structure. The preparation method comprises the following steps: dispersing fullerene of the micro nano structure in water to obtain a dispersion liquid; and adding a SnO2 precursor, a compelxingagent and a reducer into the dispersion liquid to react under conditions of heating, stirring and refluxing, and cooling the solution and separating the solid to obtain the composite material. The embodiment of the invention also provides the application of the composite material in photocatalytic degradation of organic pollutants. The composite material is novel in structure and excellent in performance. When the composite material is used as a photo catalyst, the energy band structures of SnO2 and fullerene of the micro nano structure are high in matching degree, low in electron-cavity recombination rate, good in quantum efficiency, high in optical utilization ratio and good in photo catalytic activity.

The invention belongs to the technical field of photoelectric detectors, and particularly relates to a quantum dot photoelectric detector. The quantum dot photoelectric detector comprises an N-type semiconductor layer, a P-type semiconductor layer and a quantum dot layer, the N-type semiconductor layer and the P-type semiconductor layer are oppositely arranged, the quantum dot layer is arranged between the N-type semiconductor layer and the P-type semiconductor layer, and the P-type semiconductor layer comprises composite metal oxide. The molecular formula of the composite metal oxide is An-1BnO3n-3, wherein A is selected from any one of metal elements, B is selected from any one of transition metal elements, and n is greater than or equal to 3; and the N-type semiconductor layer comprises a perovskite material. The photoelectric detector comprises a P/N structure quantum dot photoelectric detector of the perovskite material, the quantum dots and the composite metal oxide, the photoresponse range is wide, optical signals with the wavelength of 200-800 nm can be detected, the sensitivity is high, detection of the optical signals can be achieved without external electric field driving, and application is convenient and flexible.