60results about How to "Wide absorption spectrum range" patented technology

The invention discloses a preparation method of nitrogen (N)-doped titanium dioxide (TiO2) microspheres. In the invention, urea is used as a nitrogen source, hydrochloric acid is used as a protecting agent of butyl titanate (TBT), and a solvent heat method (ethanol and water mixing liquid is used as a solvent) is adopted for synthesizing the N-doped TiO2 microspheres. According to the method, TiO2 microspheres with good appearance can be prepared, and in addition, nitrogen elements in the urea is utilized for nitrogen doping, so the visible light absorption of the TiO2 microspheres is obviously improved. The method simultaneously realizes the microsphere preparation and the N doping, the preparation process is simple, the cost is low, and in addition, the application range is wide. The preparation method can be used in the fields of catalysis, dye solar cells, and the like.

The invention discloses a preparation method of a tin-doped bismuth oxychloride visible light photocatalyst. The method concretely comprises the following steps: 1, dissolving 1mmol of Bi(NO3)3.5H2O in 10mL of a hydrochloric acid solution with the molar concentration of 1mol/L to prepare a solution X; 2, dissolving 1mmol of SnCl2.2H2O in 40mL of the hydrochloric acid solution with the molar concentration of 1mol/L under stirring and heating conditions to obtain a transparent and clear solution Y; 3, adding the solution X to the solution y in a dropwise manner under stirring, continuously stirring the obtained solution for 30min, and adjusting the pH value of the obtained mixed system to 1-9 by using a sodium hydroxide solution with the molar concentration of 2mol/L; and 4, continuously stirring the mixed system for 2h after the pH value is stable, filtering and separating the obtained mixture, respectively washing the obtained solid with water and ethanol 3 times, and drying the washed solid in a constant temperature drying box at 60DEG C for 5h to prepare the tin-doped bismuth oxychloride visible light photocatalyst. The tin-doped bismuth oxychloride visible light photocatalyst prepared in the invention has the advantages of wide absorption spectrum range, stable performances, no toxicity, high efficiency and low cost, can be applied in degradation of difficult-biodegradation dye wastewater, and has strong market application prospect.

The invention provides a preparation method of a visible light catalyst. The preparation method comprises the following steps: weighing tetrabutyl titanate, ethanol, hydrazine hydrate and AgNO3, dispersing the tetrabutyl titanate in the ethanol, adding N2H4.H2O, ultrasonically dispersing in icy water bath for 0.5 to 1.5 h, forming TiO2 precursor sol, transferring the TiO2 precursor sol into a hydrothermal kettle, adding AgNO3 into the hydrothermal kettle at an ultrasonic state, reacting for 6 to 10 h at 160 to 200 DEG C, and obtaining the anatase TiO2/Ag visible light catalyst. Oxygen vacancyformed inside the TiO2 prepared by virtue of the reduction of N2H4.H2O is synergistic with Ag, so that the absorption spectral range of a sample is enlarged, the propagation rate and separation efficiency of photon-generated carrier can be improved, and the visible light catalytic efficiency can be increased. The oxygen vacancy is separately formed inside TiO2 and nano silver corresponding to thevisible light is carried on the surface of TiO2 by virtue of in-situ reduction reaction, and the preparation method is simple and easy to control.

The invention discloses a spectral selective light absorption structure for solar water gasification. The spectral selective light absorption structure combines metal with a high dielectric constant imaginary part and a traditional dielectric medium into a special nanometer structure, realizes spectral selective absorption of sunlight, and is wide in absorption spectrum range and high in photo-thermal conversion efficiency. The spectral selective light absorption structure comprises a bottom layer supporting plate, wherein a metal film is formed on the bottom layer supporting plate, and a dielectric medium film is formed on the metal film; a square array formed by a plurality of metal nanometer arc-edge quadrangular-star-shaped prisms is formed on the dielectric medium film, and circular holes are formed in the centers of the metal nanometer arc-edge quadrangular-star-shaped prisms; and any four adjacent metal nanometer arc-edge quadrangular star-shaped prisms in the square array form one square in a surrounding mode, the center of each square is provided with a cylindrical hole penetrating through the bottom layer supporting plate, the metal film and the dielectric medium film, and the metal nanometer arc-edge quadrangular star-shaped prisms can coincide with the prisms after rotating by 90 degrees or 180 degrees or 270 degrees or 360 degrees around center shafts of the prisms.

The invention discloses a preparation method for a Bi2S3/SnS2/Bi2O3 three-component composite photocatalyst capable of effectively degrading dye wastewater. The preparation method comprises the following steps: dissolving Bi(NO3)3.5H2O in a mixed solution of ethanol and glycerol so as to obtain a solution A; then adding thiourea into the solution A and carrying out magnetic stirring for 40 min so as to obtain a solution B; dispersing SnCl4.5H2O in the solution B and continuing magnetic stirring so as to obtain a solution C; then transferring the solution C into a polytetrafluoroethylene reaction vessel and carrying out a reaction at 180 DEG C; carrying out natural cooling to room temperature after completion of the reaction and carrying out filtering and separation; separately carrying out washing with water three times and washing with ethanol three times and then carrying out drying; and finally, carrying out calcining at 280 DEG C so as to obtain the Bi2S3/SnS2/Bi2O3 three-component composite photocatalyst. The Bi2S3/SnS2/Bi2O3 three-component heterojunction composite photocatalyst prepared by using the simple method has excellent photocatalytic activity; and the three-component composite photocatalyst has excellent properties like a wide absorption spectrum range, stable performance, no toxicity, high efficiency and low price, is applicable to degradation of organic pollutants difficult to biodegrade and has good market application value.

The invention discloses a preparation method of a bismuth-doped tin oxide photocatalyst capable of efficiently degrading dyestuff and antibiotic wastewater. The preparation method comprises the following steps: dissolving 0.5 to 6mmol of Bi(NO3)3.5H2O into 15mL of a diluted nitric acid solution to obtain a transparent clarified solution A; then dissolving 3mmol of Na2SnO3.4H2O into 5mL of de-ionized water to obtain a solution B; adding the solution B into the solution A under a stirring condition; supplementing the de-ionized water to enable the total volume of a mixing system to be 30mL; after continually stirring for 30min, transferring the mixing system into a 50mL polytetrafluoroethylene reaction kettle; then putting the polytetrafluoroethylene reaction kettle into a constant-temperature drying oven at 180 DEG C and reacting for 24h; after reaction is finished, naturally cooling to room temperature; centrifuging and separating; washing with de-ionized water and ethanol in sequence;then putting into the constant-temperature drying oven at 60 DEG C and drying for 12h to obtain the bismuth-doped tin oxide photocatalyst. The bismuth-doped tin oxide photocatalyst prepared by the method has the advantages of wide absorption light spectrum range, stable performance, high efficiency, no toxin and low cost and can be used for efficiently degrading organic pollutants which are difficultly biologically degraded.

The invention discloses a preparation method of a bismuth doped tin oxide/bismuth phosphate composite photocatalyst. Bi(NO3)3.5H2O is dissolved in a dilute nitric acid solution to obtain a clear and transparent solution A; Na2SnO3.4H2O is dissolved in deionized water to obtain a solution B; under the stirring condition, the solution B is dropwise added into the solution A to obtain a solution C; Na2HPO4.12H2O is dissolved in the deionized water to obtain a solution D; then, under the stirring condition, the solution D is dropwise added into the solution C; the deionized water is supplemented,so that the total volume of a mixed system is 30mL; the solution is charged into a 50mL high-pressure reaction kettle; the high-pressure reaction kettle is put in a 180 DEG C constant temperature drying box; hydrothermal reaction is performed for 24h; after the high-pressure reaction kettle is cooled to room temperature, reaction liquid is centrifuged; after washing, the reaction liquid is put ina 60 DEG C constant temperature drying box; drying is performed for 12h; the bismuth doped tin oxide/bismuth phosphate composite photocatalyst is prepared. The prepared composite photocatalyst has theadvantages that the absorption spectrum range is wide; the performance is stable; high efficiency and no toxicity are realized; the composite photocatalyst can be used for efficiently degrading nonbiodegradable organic pollutants.

The invention discloses a quinophthalone compound shown in the formula A, a preparation method thereof and application of the quinophthalone compound as a light absorption material. The preparation method comprises the steps that phthalic anhydride and 2-methyl-3-hydroxyquinoline are added into a reaction container according to the weight ratio of 1:(3-5), a solvent is 1,3,5-trichlorobenzene, thetemperature is slowly increased to 150-200 DEG C, and the temperature is kept constant for 2-3 h for performing a condensation reaction. According to application, the quinophthalone compound shown inthe formula A, nanometer titania of the core-shell structure and an ultraviolet light absorber are dispersed into optical resin to form an anti-blue-light resin material. The material has the performance for distinguishing and absorbing blue light of different wave bands, the low transmittance is kept for the short and medium wave band harmful blue light, the high transmittance is kept for long wave band beneficial blue light and visible light of other wave bands, the eyesight is protected, and the problem that damage is caused by ultraviolet light and blue light to the human eyes is well solved.

The invention discloses a Si-APD photoelectric detector based on black silicon and quantum dots and a preparation method of the Si-APD photoelectric detector. The Si-APD photoelectric detector comprises an intrinsic Si substrate (1); a P region (2) which is positioned above the center of the intrinsic Si substrate (1); protection ring regions, namely N regions (3), which are located above the twosides of the intrinsic Si substrate (1); an N+ region (4) which is positioned above the P region (2); an N+ black silicon layer (5) which is located above the N+ region (4); a quantum dot region (9) which is located on the upper surface of the N+ black silicon layer (5); a P+ region (7) which is located below the intrinsic Si substrate (1); an upper electrode (6) which is located on the quantum dot region (9) and the upper surface of the annular protection region N region (3); and a lower electrode (8). According to the invention, the black silicon layer covered with quantum dots is used as the photosensitive layer, and the high infrared absorption characteristic of the black silicon layer is utilized, so that the problems that a traditional Si-APD photoelectric detector cannot respond toa near infrared band or is low in near infrared responsivity and the like are solved; the Si-APD photoelectric detector can absorb near-infrared band light waves, and has the advantages of wide spectral response, high responsivity, low over-noise, low cost, easiness in processing and the like.

The invention discloses a preparation method of a tin-doped bismuth oxychloride and graphene composite photocatalyst. The method particularly comprises the steps that 1, Bi(NO3)3.5H2O is dissolved in a hydrochloric acid solution, and a solution X is obtained; 2, SnCl2.2H2O is stirred, heated and dissolved in a hydrochloric acid solution, and a transparent clear solution Y is obtained; 3, under the action of stirring, the solution X is dropwise added into the solution Y, and a sodium hydroxide solution with the molar concentration of 2 mol/L is used for adjusting the pH value of the mixed solution to be 6; 4, drying is conducted at 60 DEG C for 5 h, and the tin-doped bismuth oxychloride visible-light-driven photocatalyst is obtained; 5, the tin-doped bismuth oxychloride visible-light-driven photocatalyst is added into an aqueous solution of graphene, drying is conducted at 60 DEG C for 5 h, and the tin-doped bismuth oxychloride and graphene composite photocatalyst is obtained. The prepared tin-doped bismuth oxychloride and graphene composite photocatalyst has a good light absorption property and a visible light-responded photocatalysis property.

The invention discloses a signal-amplification fluorescence detection system which comprises a recognition unit, which is marked with fluorescent molecules, is used for recognizing biomarker moleculesof Alzheimer's disease, and is combined with the biomarker molecules to form a biological complex; a fluorescence quenching unit which is used for adsorbing the recognition unit to quench fluorescence of the fluorescent molecules, wherein the fluorescence quenching unit and the biological complex are desorbed, so that fluorescence of fluorescence molecules is recovered; and a signal amplificationunit, which is used for degrading the recognition unit in the biological complex. The fluorescence detection system is used for detecting the biomarker molecules of the Alzheimer's disease, the fluorescence detection system has the advantages of rapidness, simplicity, sensitivity and high efficiency; and meanwhile, the system can amplify a fluorescent molecular signal and reduce the detection limit of the system, and has high sensitivity. The invention further discloses a fluorescence biosensor which comprises the fluorescence detection system and can provide effective information for diagnosis and screening of the Alzheimer's disease.

The invention discloses a cesium-tin-iodine film and a preparation method and application thereof, and the preparation method of the Cs2SnI6 film comprises the following steps: (1) adding cesium iodide and tin iodide into DMSO or a mixed solvent of DMSO and DMF, stirring and dissolving at 20-70 DEG C to prepare a Cs2SnI6 precursor solution; (2) standing and aging the precursor solution prepared inthe step (1) in an N2 atmosphere for 3 days to 10 days, and spin-coating and depositing the precursor solution on a substrate to obtain a precursor film; (3) placing the precursor film obtained in the step (2) on a heating stage with the temperature of 30-70 DEG C, and standing for 1.0 min to 40 min; then putting the film on a spin coater, dripping 40 microliters to 100 microliters of supplementary solution, and spin-coating to be dry after dripping the solution; and (4) annealing the film obtained in the step (3) to obtain the Cs2SnI6 film.

The invention discloses a piece of transparent conducting oxide film-plated glass. The transparent conducting oxide film-plated glass comprises a glass matrix, a shielding layer, and a transparent conducting oxide layer, wherein the above-mentioned components are successively laminated. Grain sizes of the oxide of the transparent conducting oxide layer are gradually reduced from one side approaching the shielding layer to one side far away from the shielding layer. Because of controlling of the grain size of the oxide of the transparent conducting oxide layer of the transparent conducting oxide film-plated glass, the grain size of one side approaching the shielding layer is large and the grain size of one side far away from the shielding layer is relatively small. The film layer structure of the transparent conducting oxide layer has the high scattering characteristic for the solar light form the long wave length to the short wave length, so that the transparent conducting oxide film-plated glass can absorb the solar light with the wide spectral region. In addition, the invention also provides a preparation method for the transparent conducting oxide film-plated glass.

The invention discloses a preparation method for a stannous sulfide/graphene compound photocatalyst. The preparation method includes the specific steps that 0.008-0.377 g of graphene oxide is added in 50 mL of ethanediol, is subjected to ultrasonic processing till being completely dispersed and is then magnetically stirred for 2 h; 1.127 g of SnCl2.2H2O is added in the solution mentioned above; then, 0.381 g of thiourea is added in the solution mentioned above under the magnetic stirring condition; magnetic stirring continues to be conducted for 2 h, and the mixed liquid is transferred in a polytetrafluoroethylene reaction kettle; hydrothermal reaction is conducted for 6 h at the temperature being 160 DEG C; the mixture is naturally cooled to the room temperature after the reaction is completed; filtration and separation are conducted; water washing is conducted three times, and ethyl alcohol washing is conducted three times; and then, drying is conducted, and the stannous sulfide/graphene compound photocatalyst is obtained. The prepared stannous sulfide/graphene compound photocatalyst can improve the light absorptivity, has the beneficial effects of being wide in absorption spectrum range, stable in performance, free of toxin, efficient, low in price, and the like, can be applied to degrading of organic pollutant which is difficult to biodegrade, and has high market application value.

The invention discloses a synthesis method of a CdSe-BiOCl heterojunction. The method comprises the following steps: (1), by using Bi(NO3)3.5H2O and NaCl as raw materials and water as a solvent, carrying out hydrothermal synthesis to obtain BiOCl; (2), dissolving Na2SO3 and selenium powder in deionized water, and carrying out first heating and reflux to prepare a Se source precursor; dissolving cadmium acetate dihydrate and thioglycollic acid in deionized water to prepare an alkaline solution, injecting the Se source precursor into the alkaline solution, and carrying out second heating and reflux under the protection of nitrogen to prepare a CdSe quantum dot aqueous solution; and (3), mixing the CdSe quantum dot aqueous solution with BiOCl, and carrying out in-situ coprecipitation, so as to prepare a CdSe-BiOCl heterojunction; and enabling the CdSe-BiOCl heterojunction to be composed of quantum dots CdSe and BiOCl nanometer particles. The prepared CdSe-BiOCl heterojunction can be usedas a photocatalyst, and when rhodamine B is subjected to photocatalytic degradation, the degradation rate of the CdSe-BiOCl heterojunction can reach over 1.4 times of that of pure BiOCl.

The invention discloses a preparation method of a zinc molybdate/graphene composite visible light catalyst. The preparation method comprises the following steps of (1) adding 2 mmol of Na2M0O4 into a graphene oxide solution, and performing ultrasonic dissolution for 30 min, so as to prepare a solution X; (2) mixing and dissolving 2mmol of Zn(CH3COO)2.2H20 into 40 ml of water, so as to obtain a transparent clear solution Y; (3) dropwise adding the solution Y into the solution X under the ultrasonic action, performing ultrasonic operation for 120 min, then adding hydrazine hydrate, uniformly mixing, and then reducing in a water bath at 80 DEG C to polymerize and precipitate, so that the solution is clear; (4) naturally cooling the solution to room temperature after reaction, filtering, washing with water and ethanol respectively for three times, and then drying in a constant-temperature drying box at 80 DEG C for 5 hours, so as to prepare the zinc molybdate/graphene composite visible light catalyst. By using the zinc molybdate/graphene composite visible light catalyst prepared with the preparation method, the light absorption can be improved. The zinc molybdate/graphene composite visible light catalyst has the advantages of wide absorption spectrum range, stable performance, no toxicity, high efficiency and cheapness, can be applied to degrading organic pollutants which are difficult to biodegrade and has a strong market application prospect.

The invention discloses a bismuth oxyiodide composite photocatalytic material modified with carbon-coated ferroferric oxide magnetic microspheres as well as a preparation method and an application ofthe bismuth oxyiodide composite photocatalytic material. The preparation method of the composite photocatalytic material comprises the steps as follows: firstly, the carbon-coated ferroferric oxide magnetic microspheres are prepared with a hydrothermal carbonization method and the supported on the surface of bismuth oxyiodide in a hydrothermal co-deposition manner. Pichia pastoris in the compositeis cheap, easy to obtain, non-toxic and harmless, the preparation process is convenient, green and environmentally friendly, the reaction condition is easy to control, and secondary pollution is notproduced. The prepared composite catalytic material has uniform particle size, high light absorption strength, wide absorption range, high photon-generated carrier generation rate, good conduction effect and low composition rate, and the composite photocatalytic material has high stability and certain magnetism, can be recycled under the external magnetic field condition and has environmental protection benefits. The composite photocatalytic material has the advantages of being fast to degrade, high in removal rate, convenient to operate, low in cost, free of secondary pollution and the like when applied to photocatalytic degradation of antibiotic wastewater.