275results about How to "Improve visible light absorption" patented technology

The invention relates to a method for preparing hydrogen through photoanode-photovoltaic battery coupled dual-illumination fully-photic-driven decomposition of water. Efficient decomposition of water is realized under sunlight illumination conditions by using coupling of a photoelectrocatalysis technology with a photovoltaic battery technology, adopting a water oxidation cocatalsyt modified semiconductor material as a photoanode, placing a proton reduction cocatalyst modified Si battery in an electrolyte as a photocathode, directly connecting the positive electrode of the Si battery with the anode through a lead and allowing the surface of the cathode to contact with the electrolyte. The method realizes fully photic driven decomposition of water without applied bias conditions, and the solar energy utilization efficiency STH of the method reaches 2.2% or above.

The invention relates to a nanometer composite, and particularly relates to a method for preparing a nanometer composite with a chrysanthemum structure. The method comprises the steps of adding titanium dioxide nanosheets into deionized water, carrying out ultrasonic dispersion, and obtaining a titanium dioxide dispersing liquid; under the condition of magnetic stirring, adding sodium molybdate and thioacetamide into the titanium dioxide dispersing liquid, and obtaining a mixed solution A; after finishing adding, stirring the mixed solution continuously, then transferring the mixed solution into a Teflon inner container, sealing the inner container in a stainless steel hydrothermal reaction kettle for hydrothermal reaction, after finishing the hydrothermal reaction, naturally cooling the reaction kettle to room temperature, centrifuging the obtained product, washing, vacuum drying and obtaining the composite. The method has the advantages that the source of raw materials is wide, and the method is simple and practicable and has low cost. The prepared titanium dioxide or molybdenum disulfide nanometer composite not only has good capacity in absorbing organic contaminants, but also has a good visible light photocatalytic degradation effect to organic contaminants.

The invention discloses a method for preparing a Bi/BiVO4 composite photoanode material by photodeposition. The method comprises the following steps: soaking a BiVO4 electrode in an ethylene glycol/water mixed solution of Bi(NO3)3 5H2O, and illuminating to uniformly generate a layer of an ash black film on the surface of the BiVO4 electrode; and washing with ethyl alcohol to obtain a Bi/BiVO4 composite photoanode. According to the method, metal Bi particles are successfully loaded on a multihole BiVO4 thin film in a simple photo-reduction process; furthermore, introduction of the metal Bi particles enlarges an absorption range of bismuth vanadate to visible light; meanwhile, electrons in the metal Bi particles are transferred onto a BiVO4 conduction band to increase the concentration of current carriers; and a hole in the BiVO4 surface in a pure Na2SO4 solution oxidizes part of the metal Bi nano particles, so that separation of electron-hole pairs is effectively promoted, and the photoelectric chemical decomposition performance of water is improved.

The invention discloses a preparation method for a copper/cuprous oxide/cyclized polyacrylonitrile visible-light-driven photocatalyst, and belongs to the technical field of environmental cleaning photocatalyst new materials. The preparation method includes the steps of firstly, preparing a nanometer copper hydroxide/photocatalyst compound by synchronously conducting solvent conversion and in-situ ion exchange reaction with photocatalyst, cupric nitrate and sodium hydroxide as raw materials; secondly, reducing copper hydroxide into cuprous oxide in situ through ascorbic acid; thirdly, conducting thermal treatment under the nitrogen atmosphere, reducing a small amount of cuprous oxide into elementary substance copper while cyclization and dehydrogenation are conducted on polyacrylonitrile to form a conjugated structure, and obtaining the copper/cuprous oxide/cyclized polyacrylonitrile visible-light-driven photocatalyst. The raw materials are wide in source, cost is low, the preparation method is simple and suitable for large-scale production, cyclized polyacrylonitrile can improve the separation efficiency of photoproduction electron holes and absorption of the visible light areas and can have a protection and optical corrosion reduction effect on copper/cuprous oxide, and the obtained catalyst is remarkable in adsorption and photocatalytic effect.

The present invention relates to a preparation method for an Ag3VO4/TiO2 compound nano-wire having visible light activity, belonging to the technical field of environmental pollution control. The preparation method comprises steps for preparing Ag3VO4/TiO2 compound nano-wire, and specifically the steps are as follows: Ag3VO4/TiO2 compound nano-particles are added to an alkaline solution and dispersed, and is subjected to a hydrothermal reaction at a temperature of 120 ~ 250 DEG C for 24 ~ 56h, and after the reaction is completed, obtained precipitate is washed and dried, and is calcined at 100 ~ 800 DEG C for 3 ~ 8h. According to the present invention, the Ag3VO4/TiO2 compound nano-wire has beneficial effects of a large specific surface area and a large adsorption capacity.

The invention discloses a nanometer photo-catalyst used in producing hydrogen by decomposing water under visible light response and application of the nanometer photo-catalyst. The catalyst is a nanocomposite which is formed by taking a one-dimensional organic semiconductor nanofiber as a framework, coating the surface of the framework with an inorganic semiconductor titanium dioxide nanolayer and uniformly loading platinum nanoparticles, wherein the organic semiconductor nanofiber is prepared by self-assembling super molecules of perylene diimide and cycle-expanding derivatives, naphthalene diimide derivatives or hexabenzobenzene diimide derivatives with the photochemical stability, D-A structures and visible light response, then titanium dioxide is directly loaded in situ in a body phase organic solution and platinum is reduced and deposited through ultraviolet light in a photo-catalysis aqueous solution system. The catalyst is novel in structure, low in cost and available; the preparation process of the catalyst is simple, environmentally-friendly, low in energy consumption and suitable for preparation in scales; the catalyst is capable of decomposing water in the visible light to prepare the hydrogen, has the actual and wide application prospects in preparation of the hydrogen through decomposing the water in solar light and provides a novel idea and an important reference for forming an efficient photo-catalyst responding to the visible light.

The invention belongs to the technical field of an environmental material, and particularly relates to a molybdenum and carbon-codoped titanium oxide nanotube array thin film material and a preparation method thereof. The molybdenum and carbon codoping of a titanium oxide nanotube can be realized by introducing molybdenum element into the titanium oxide nanotube formed on a titanium sheet and the surface thereof through alloying, and then introducing carbon element through carbon monoxide atmospheric thermal treatment; in the obtained molybdenum and carbon-codoped titanium oxide nanotube array thin film material, a part of titanium atoms in the titanium oxide nanotube are replaced by molybdenum, a part of oxygen atoms are replaced by carbon, the ratio of the molybdenum atoms to carbon atoms ranges from 0.03 to 0.15, and the ratio of the doped carbon atoms to titanium atoms ranges from 0.01 to 0.09. The thin film material is attached to a titanium alloy substrate, and comprises orderly titanium oxide nanotubes perpendicular to the substrate. The photocatalysis and photo-electrochemical properties of the thin film material in visible light are far higher than those of the traditional titanium oxide thin film material, and the thin film material has excellent application prospects on the aspects of photocatalytically degrading organic matters in water and reducing heavy metal ions.

The invention provides a preparation method of an ultrathin molybdenum disulfide nanosheet/silicon nanowire (SiNWs/MoS2) heterojunction structure. The preparation method comprises the following stepsthat S1, silicon wafers are cleaned; S2, the etching of a silicon nanowire array is assisted through the catalysis of metal nano particles; and S3, by taking the silicon nanowire array obtained in theS2 as a substrate, and molybdenum oxide and sulfur powder as a precursor, annealing growth is carried out, and the ultrathin molybdenum disulfide nanosheet/silicon nanowire heterojunction structure is obtained. Through the construction of the ultrathin molybdenum disulfide (MoS2) nanosheet/silicon nanowire heterojunction structure, the catalytic active site density of molybdenum disulfide can beimproved effectively, the photocatalysis hydrogen production efficiency of silicon nanowires is improved effectively and the catalysis stability of the silicon nanowires can be improved. A preparationprocess of the preparation method is simple and easy to implement, the cost is low, and mass production is easy.

The invention discloses a visible light catalyst molybdenum disulfide loaded titanium dioxide nano-tube electrode as well as a preparation method and application thereof. The visible light catalyst molybdenum disulfide loaded titanium dioxide nano-tube electrode prepared in the invention has obvious visible light absorbability, and has an obvious photocurrent response at the same time. The visible light catalyst molybdenum disulfide loaded titanium dioxide nano-tube electrode prepared by the method disclosed by the invention shows very good visible light photoelectrocatalysis activity when used for degrading organic dye wastewater. The visible light catalyst molybdenum disulfide loaded titanium dioxide nano-tube electrode disclosed by the invention has the beneficial effects that the process is simple, the catalyst is easy to reclaim, and the electrode can be applied to large-scale industrial production, has a relatively high efficiency of degrading the organic dye wastewater in a visible light range, and has a very high practical value and application prospect.

The invention discloses a halogen bismuth oxide/titanium carbide photocatalysis composite material and a preparing method thereof. According to the photocatalysis composite material, Ti3C2 is distributed around flower-like microspheres of BiOClxI1-x, wherein Ti3C2 is of a two-dimensional layered structure, and BiOClxI1-x is of a flower-like microsphere structure formed by self-assembly of nanosheets. The BiOClxI1-x/Ti3C2 photocatalysis composite material can serve as a potential catalyst, carbon dioxide and heavy-metal ions are effectively reduced under irradiation of visible light, and organic benzene series, antibiotics and other organic pollutants are degraded. The preparing method is simple, convenient to operate, low in cost and suitable for industrial production.

The invention provides a preparation method of a titanium dioxide-mesoporous polymer nano porous composite visible light catalytic material, which comprises the following steps: a. polymerizing azodiisobutyronitrile used as initiator, divinylbenzene used as a crosslinking monomer, 4-vinyl pyridine or 1-vinyl imidazole used as a functional monomer and n-butyl titanate used as a titanium source under solvothermal conditions at 80-140 DEG C for 12-24 hours, thus obtaining a bulk polymer solid; and b. placing the polymer solid product into a reaction kettle, adding a right amount of water, and performing hydrothermal treatment at 150-180 DEG C for 10-24 hours, thus obtaining the titanium dioxide-mesoporous polymer multistage nano porous composite visible light catalytic material. The material preparation method is simple; the obtained photocatalyst has excellent enriching effect and catalytic degradation activity on organic pollutants, especially decabromobisphenol A; and the bulk shape is beneficial to the recycling of the catalyst in the use process.

The invention relates to a preparation method of a C-doped BiOBr microsphere photocatalyst. The method comprises the following steps: under constant-temperature high-speed dispersion conditions, slowly adding a bismuth salt solution into a sodium alginate dispersion solution, and carrying out dispersing at a high speed for 5-50 minutes; slowly adding a bromine salt solution into the system under ahigh-speed dispersion condition, and carrying out high-speed dispersion for 5-50 minutes; then transferring the reaction system into a high-pressure reaction kettle for a hydrothermal reaction so asto obtain a product; and subjecting the product to suction filtration separation, repeated washing with distilled water, and drying overnight to obtain the C-doped BiOBr microsphere photocatalyst. TheC-doped BiOBr microsphere photocatalyst is synthesized through a one-step hydrothermal reaction; the method is simple in process and low in cost; and the prepared C-doped BiOBr microsphere photocatalyst has good catalytic degradation performance on TC under simulated sunlight and has good application prospects in the field of photocatalytic degradation of antibiotic wastewater.

The invention discloses a TiO2/WO3 visible-light photocatalyst with surface oxygen vacancy, and a preparation method and application thereof. The TiO2/WO3 visible-light photocatalyst is prepared through the following steps: with P25, HNO3 and an ammonium tungstate hydrate as precursors, carrying out calcination by controlling the temperature in a range of 450 to 550 DEG C in static air so as to obtain TiO2/WO3; and with pure hydrogen as a reducing agent, carrying out reduction by controlling the temperature in a range of 200 to 600 DEG C so as to obtain the TiO2/WO3 with surface oxygen vacancy. The TiO2/WO3 visible-light photocatalyst with the surface oxygen vacancy provided by the invention forms visible light absorption in a wavelength range of 400 to 800 nm, and has good visible-light photocatalytic degradation efficiency to gaseous toluene; meanwhile, the TiO2/WO3 visible-light photocatalyst has simple preparation method and significant effects, and can improve the utilization rate of sunlight.

The invention discloses a visible light driven photocatalysis hydrogen production catalyst as well as a preparation method and application thereof. According to the technical scheme of the invention, tetraisopropyl titanate and tantalum-containing polyacid Ta-POMs-1 are adopted as precursors, the photocatalysis hydrogen production catalyst Ta-POM-1/TiO2 is prepared by using a sol-gel method; and by optimizing and selecting types and amounts of dye molecules, types and amounts of sacrifice catalysts and amounts of the catalyst, the reaction conditions of catalysis hydrogen production with visible light, of the catalyst, can be optimized. Compared with parent TiO2 and POMs, a prepared Ta-POM-1/TiO2 composite photocatalysis material is relatively good in visible light absorption and relatively high in photocatalysis hydrogen production activity, so that the visible light driven photocatalysis hydrogen production catalyst is relatively good in application prospect in the field of photocatalysis.

An AgInS2 nanoflower having visible light photocatalytic oxidation and photocatalytic reduction capabilities is disclosed. The AgInS2 nanoflower is a brick-red nanometer ternary metal sulfide which has a flower-shaped micro structure and which is prepared by subjecting AgNO3 and InCl3 in an equal mole ratio and excessive thiourea to a hydrothermal reaction. The AgInS2 nanoflower is applied for catalytic degradation of pollutants. The AgInS2 nanoflower has a low energy gap, and the micro structure of the nanoflower is flower-shaped, and therefore the nanoflower is high in specific surface area and high in adsorbability. Capabilities of photocatalytic oxidation degradation of organic pollutants and photocatalytic reduction of inorganic pollutants are greatly improved. Visible light adsorbability is better. A process is simple, easy to operate and can be applied for industrial production.

The invention relates to a compound based on indacenodithiophene and application of the compound. Specifically, the invention relates to the compound as shown in a formula (I), and the groups are described in the description. The invention further relates to a compound as shown in a formula (II) used for preparing the compound as shown in the formula (I), application of the compound as shown in the formula (I), a preparation method of the compound as shown in the formula (I), a photosensitive active layer, a solar panel, an organic electroluminescence screen, an organic semiconductor and/or a semitransparent organic solar panel, wherein the photosensitive active layer, the solar panel, the organic electroluminescence screen, the organic semiconductor and/or the semitransparent organic solar panel comprise(s) the compound as shown in the formula (I). The compound as shown in the formula (I) has an excellent plane structure and a relatively low reorganization energy, so that the material has quite high charge transfer performance, and the excellent photo absorption performance and the film-forming property lead to a quite high photoelectric converting efficiency of the material.

A BixCel-xVO4 nanorod with visible-light activity is a nanoscale compound having a rod-like light-yellow microstructure and obtained by hydrothermal reaction of Bi(NO3)3.5H2O, Ce(NO3)3.6H2O and NH4VO3 at a molar ratio of x to 1-x to 1 (x is more than 0 and less than 1). A preparation method for the BixCel-xVO4 nanorod mainly comprises the following steps: uniformly mixing Bi(NO3)3.5H2O, Ce(NO3)3.6H2O and water to obtain a solution A; adding water into the NH4VO3 and dissolving a mixture in water bath with the temperature of 60 DEG C to obtain a solution B; dropwise adding the solution A into the solution B, performing hydrothermal reaction at 120 to 200 DEG C for 1 to 6 hours, cleaning precipitates, drying, and then calcining at 300 to 800 DEG C for 12 to 48 hours to obtain a light-yellow powdery substance, namely the BixCel-xVO4 nanorod. The BixCel-xVO4 nanorod is large in specific surface area and strong in adsorption capacity, has better visible-light absorption performance and greatly improves photocatalytic oxidation degradation of organic pollutants; and the preparation method for the BixCel-xVO4 nanorod is relatively simple and easy to operate.

The invention relates to a preparation method and applications of an In2S3/BiPO4 heterojunction photocatalyst, and belongs to the technical field of environment material preparation. According to thepreparation method, hydrothermal method is adopted, thioacetamide is taken as a sulfur source, sodium hydroxide is adopted to adjust pH value, synthesis of In2S3 nanometer particles (about 10nm) is carried out, simple water bath heating method is adopted so as to coat the surface of rod-shaped BiPO4 with In2S3, and prepare the In2S3/BiPO4 heterojunction photocatalyst. The In2S3/BiPO4 heterojunction photocatalyst is nontoxic, is stable, and is high in photocatalytic activity; construction of heterojunction is capable of improving separation of photo-induced electrons and photo-induced holes, and improving the photocatalytic activity of the photocatalyst.

The invention discloses an amorphous bismuth oxide hybrid photocatalyst, a preparation method and a usage method. The preparation method comprises the following steps: dissolving bismuth an elementary substance precursor into a solvent to obtain a bismuth solution, wherein the solvent comprises ethanol and ethylene glycol in the volume ratio of 1:1; performing thermal treatment to the bismuth solution under the environment of 160DEG C to obtain amorphous bismuth oxide; evenly dispersing the amorphous bismuth oxide into water to obtain a dispersing agent, and dropwise adding a reductive solvent into the dispersing agent to obtain a mixture solution; and reacting the mixture solution under room temperature conditions, and standing to obtain the amorphous bismuth oxide hybrid photocatalyst. Known from the experimental analysis, for the amorphous bismuth oxide hybrid photocatalyst prepared by using the preparation method, the elementary substance bismuth reduced in situ is modified on the surface of the amorphous bismuth oxide as a photoelectron capturing center to promote the separation of photon-generated carriers and enhance the absorption capability of visible light, so that the photocatalytic activity of the amorphous bismuth oxide can be activated.

The invention relates to a composite bismuth ferrite photocatalyst and a preparation method and application thereof. The preparation method of Ag/FeTiO3/BiFeO3 comprises the following steps: adding FeTiO3 to deionized water; stirring to obtain suspension; adding AgNO3 to the suspension; stirring for 20-30 minutes under a light-proof condition; then stirring for 10-20 minutes with the irradiating of an ultraviolet light; adding BiFeO3; ultrasonically dispersing; centrifugally separating; washing the obtained precipitate through deionized water; drying; and then roasting for 20-40 minutes through a muffle furnace at the temperature of 400-450 DEG C to obtain the target product. According to the preparation method, the BiFeO3 material is composited; antibiotics can be degraded through efficient photocatalyzing under the visible light effect.