232results about How to "Broaden the range of light absorption" patented technology

The invention discloses a modified graphite phase carbon nitride photocatalyst as well as a preparation method and application thereof. The modified graphite phase carbon nitride photocatalyst is prepared from urea and salicylic acid serving as raw materials by virtue of calcination, wherein a mass ratio of urea to salicylic acid is 1:(0.002-0.02). The modified graphite phase carbon nitride photocatalyst disclosed by the invention has the advantages of being high in specific surface area, wide in light absorption range, low in electron-hole pair recombination rate, excellent in photocatalyticperformance and the like, and has multiple reactive sites, excellent application value and application prospects. The preparation method has the advantages of being simple in process, wide in raw material source, low in cost, high in preparation efficiency, high in yield and the like, is suitable for large-scale preparation and is favorable for industrial production. The modified graphite phase carbon nitride photocatalyst disclosed by the invention can be used for degrading organic pollutants, has the advantages of being simple in process, convenient to operate, low in cost, high in treatmentefficiency, excellent in degradation effect and the like, and has excellent effects of degrading the various organic pollutants.

The invention provides a dye solvent heat-sensitive MOFs photocatalyst, a preparation method and application thereof. The method includes: adding dye and MOF into a hydrothermal kettle lining containing a solvent for ultrasonic treatment, then loading the hydrothermal kettle lining into a hydrothermal kettle, conducting heat preservation at 80-200DEG C for 6-48h, and then performing natural cooling to the room temperature; at the end of the reaction, washing the precipitate until the washing liquid is colorless and transparent; and drying the washed sample to obtain the dye solvent heat-sensitive MOF photocatalyst. The visible light catalytic activity of the photocatalyst is as high as 2760micromolh<-1>g<-1>, which is 8 times or more that of normal-temperature sensitization. The preparation method effectively improves the visible light catalytic hydrogen production activity of MOF, and at the same time improves the stability of MOF. The method is simple to operate and good in repeatability, and the application of the MOFs in the field of visible light catalytic hydrogen production is expanded.

A disclosed conjugated polymer containing thienothiophene and di(benzothieno)benzodithiophene has the structural general formula shown in the specification. In the structural general formula, R1 and R2 are same and are H, C1-C10 alkyl or C1-C10 alkoxy, R3 is C1-C16 alkyl or C1-C16 alkoxy, and n is an integer of 5-60. According to the conjugated polymer containing thienothiophene and di(benzothieno)benzodithiophene, thienothiophene and di(benzothieno)benzodithiophene give play to synergistic effect, and help to further reduce the energy gap and expand the luminous absorption scope, and compared with conventional polymeric materials, the conjugated polymer containing thienothiophene and di(benzothieno)benzodithiophene has a relatively wide luminous absorption scope. The invention also discloses a preparation method of the conjugated polymer containing thienothiophene and di(benzothieno)benzodithiophene.

The present invention relates to a titanium-tungsten alloy oxide nano-tube electrode with a characteristic of in-situ vertical growth, a preparation method and applications thereof, wherein the electrode can be applied in efficient photoelectric catalysis oxidation degradation of high concentration organic pollutants. According to the present invention, an argon arc melting method is adopted to prepare a titanium-tungsten (Ti-3W) alloy with uniform chemical components, and an electrochemical anodization method is adopted to generate a highly ordered Ti-W-O nano-tube array containing TiO2 and WO3 in a F<->-containing ethylene glycol solution; compared to the traditional tungsten ion-doped TiO2 nano-tubes and titanium-tungsten oxide composite films adopting TiO2 as a base, the titanium-tungsten alloy oxide nano-tube array of the present invention has characteristics of uniform dopant distribution, large specific surface area, high stability and high photoelectric catalysis performance; and the titanium-tungsten alloy oxide nano-tube electrode can be widely used in high concentration azo dye pollutant degradation researches, and has great environmental economic benefits.

The invention relates to a metal structure tungsten diselenide/redox graphene composite structure and a preparation method thereof. Firstly, a precursor aqueous solution of a WSE2 film is prepared; a monolayer graphene oxide aqueous solution and citric acid are added into the precursor aqueous solution of the WSE2 film to obtain a WSe2/RGO precursor aqueous solution; then, after hydrothermal treatment at 165-180 DEG C, a thin-film metal structure tungsten diselenide/redox graphene composite structure is obtained on a polyethylene naphthol substrate inserted into the WSe2/RGO precursor aqueous solution, and a precipitate in a residual solution after the hydrothermal treatment is filtered, washed and dried to obtain a powder metal structure tungsten diselenide/redox graphene composite structure. According to the invention, the preparation of metal structure tungsten diselenide can be realized through a one-step synthesis process through a hydrothermal method, and the preparation method is not only simple in process, but also has the excellent characteristics of low cost of used raw materials and equipment, low energy consumption, high efficiency and the like.

The invention discloses a nano titanium dioxide/copper sulphide nano composite material. Titanium dioxide nanowires are prepared by a hydrothermal method and are used as a reaction substrate, a compound structure of copper sulphide nanosheets and titanium dioxide nanowires is prepared successfully by a secondary hydrothermal method under the conditions that the temperature is 100 DEG C and the reaction time is 10 hours, meanwhile, influence of hydrothermal temperature and hydrothermal time to photocatalytic performance of the composite structure is researched. Copper sulphide is prepared into a sheet structure, the compound quantity of the copper sulphide and the titanium dioxide nanowires is increased, the copper sulphide nanosheets and the titanium dioxide nanowires form a heterostructure, the light absorption range of titanium dioxide is expanded, and finally, the photocatalytic efficiency of the composite structure is improved. In the method, equipment is simple, process parameters are controllable, and the repeatability is high. The prepared nano composite material has important application in the field of photocatalysts.

The invention discloses a method for producing an H-occupied BiVO4-OVs photocatalytic material and application of the H-occupied BiVO4-OVs photocatalytic material. The production method comprises thesteps of dissolving a certain molar weight of Bi(NO3)3.5 H2O in glycerin; dissolving a certain molar weight of NaVO3.2 H2O in deionized water; mixing solutions; transferring a mixed solution into a teflon-lined high-pressure kettle, and maintaining 180 DEG C for 8 h; conducting 10000-rpm centrifugal separation on a solvothermal synthesis product, washing the solvothermal synthesis product subjected to 10000-rpm centrifugal separation with deionized water and ethyl alcohol, and drying the washed solvothermal synthesis product subjected to 10000-rpm centrifugal separation at 60 DEG C for 4 h; calcining the solvothermal synthesis product, which is thoroughly washed, in a muffle furnace at 300 DEG C for 5 h; and conducting annealing on a calcined product in an Ar/H2 atmosphere at 350 DEG C for10 h to obtain the H-occupied BiVO4-OVs photocatalytic material. The H-occupied BiVO4-OVs photocatalytic material has the advantages that a photoresponse range is wide, the catalytic activity is high, the degradation rate is high, and the hydrolysis ability is high; and solar energy can be fully and effectively used.

The invention discloses a development and application method of a bismuth oxyhalide system material for processing organic pollutant efficiently. A novel semiconducting material which is low in synthesis cost, pollution-free and high in efficiency, and can use visible light to degrade organic pollutants can efficiently degrade pollutants in waste water, and fully mineralizes the pollutants into carbon dioxide and water, and accordingly no secondary pollutant is produced. Two aspects of synthesis technology and a material system are improved, wherein a low temperature precipitation method is adopted to synthesize a series of visible light catalysis degradation materials, and the system is mainly semiconducting materials doped with bismuth chloride oxide-I of a nanometer nuclear shell structure and compounded semiconducting materials of bismuth oxyiodide and bismuthyl bromide which are both of a slice sphere structure. The material system can be recycled and repeatedly used, and is still remarkable in degradation effect. The development and application method can be applied to printing and dyeing wastewater treatment, places materials on a fluidized bed or a fixed bed for lighting, and removes the organic pollutants with trace chemical oxygen demand and biochemical oxygen demand by deeply disposing. The bismuth oxyhalide system material can be widely applied to aspects of producing electron function materials, fire retardant, optical materials, medical composite materials, radiation proof materials and the like.

The invention provides a preparation method for a silver modified phosphotungstic acid/titanium dioxide composite membrane catalyst and relates to the preparation method for a composite membrane catalyst. The invention aims to solve the problem of low sunlight use ratio of a TiO2/H3PW12O40 composite membrane catalyst and the problem of secondary pollution to environment of a powdered composite membrane catalyst. The preparation method comprises the following steps: 1) preparing a mixed solution of titanium tetraisopropoxide and isopropyl alcohol; 2) preparing the mixed solution of dissolved H3PW12O40 and isopropyl alcohol; 3) mixing the two solutions; 4) preparing a sol after hydro-thermal treatment; and 5) spinning and ageing. The composite membrane catalyst prepared according to the invention can further promote the photocatalytic activity of TiO2/H3PW12O40 composite membrane and widen the response range thereof; the problems that most present catalysts are powdered, are difficult to be recycled and are easy to bring secondary pollution to the environment are solved; the preparation method is suitable for the preparation of the silver modified phosphotungstic acid/titanium dioxide composite membrane catalyst.

The invention provides a sulfothiazole-dithienopyrrole-benzodithiophene-containing copolymer and its preparation method and use. The sulfothiazole-dithienopyrrole-benzodithiophene-containing copolymer is a compound P having the structural formula shown in the description and in the structural formula, R1 represents H, C1-C16 straight chain or branched chain alkyl, or C1-C16 straight chain or branched chain alkylmercapto group, R2 represents C1-C12 straight chain or branched chain alkyl or other groups shown in the description, R' represents C1-C12 straight chain or branched chain alkyl and n is an integer of 5-60. The sulfothiazole-dithienopyrrole-benzodithiophene-containing copolymer contains 4,8-bis(1,3-dithiol-2-aldehyde)benzo[1,2-b: 4,5-b']dithiophene derivative, sulfothiazole and dithienopyrrole units, has a high solar spectrum matching degree, and improves energy conversion efficiency.

The invention discloses a Mo-doped MoO3@ZnIn2S4Z system photocatalyst as well as a preparation method and application thereof. The Mo-doped and Z-system photocatalyst is constructed by adopting a one-step solvothermal method, and the Mo-doped MoO3@ZnIn2S4Z system photocatalyst is reasonably designed. In the process, a template agent and a surfactant are not used, so that a cocatalyst modification(noble metal) and heterojunction step-by-step construction process is avoided. The catalyst not only widens the light absorption range and improves the utilization efficiency of sunlight, but also greatly improves the energy band structure of the heterojunction and the separation efficiency of carriers, and shows excellent photocatalytic performance.

The invention discloses a method for preparing hydrogen peroxide by using an enol-ketone type covalent organic framework/graphite phase carbon nitride composite photocatalyst. The composite photocatalyst and an electron donor solution are mixed to carry out photocatalytic reaction to obtain hydrogen peroxide, wherein the composite photocatalyst comprises an enol-ketone type covalent organic framework and graphite phase carbon nitride, and the enol-ketone type covalent organic framework is loaded on the surface of the graphite phase carbon nitride. According to the invention, the adopted composite photocatalyst has the advantages of multiple reaction active sites, wide light absorption range, low electron-hole pair recombination rate, good photocatalytic performance, good stability, environmental protection and the like, when the composite photocatalyst is used for preparing hydrogen peroxide, the yield within 1 hour can reach 880.494 [mu]mol/L, and still reaches 861.445 [mu]mol/L after five times of circulation, and the composite photocatalyst has the advantages of simple method, high preparation efficiency, high yield and the like, and can be used for large-scale preparation of hydrogen peroxide and facilitates industrial application.

The invention belongs to the field of inorganic nanometer materials and relates to a preparation method of a ZnO-loaded CdIn2S4 nano-cube composite catalyst and the application of the catalyst to the field of environmental governance. CdIn2S4 nano-cubes are synthesized by using cadmium nitrate tetrahydrate, indium nitrate monohydrate and thioacetamide as raw materials, and a ZnO-loaded CdIn2S4 nano-cube compound is synthesized through deposition and a hydrothermal method. The composite material has the advantages of large specific surface area, wide spectral response range, strong light-harvesting ability, convenience in separation of photon-generated carriers and the like and has very excellent solar photocatalytic degradation ability. A synergistic effect can be used in the ZnO-loaded CdIn2S4 nano-cube composite material, effective transfer and separation of the photon-generated carrier are realized, the light absorption range of the compound is widened, and effective degradation of tetracycline hydrochloride and ofloxacin by the compound under solar light is realized.

The invention belongs to the technical field of materials, and provides a preparation method and application of a modified material based on titanium dioxide, which comprises the following steps: dissolving a certain amount of boric acid and rhodium chloride trihydrate in water containing nitric acid and alcohol to obtain a solution A; dropwise adding isopropyl titanate into the ethanol solution at the temperature of 0-4 DEG C to obtain a solution B; slowly dropwise adding the solution A into the solution B to obtain titanium dioxide sol; aging the titanium dioxide sol at room temperature, andperforming drying to obtain xerogel; and finally, grinding the dry gel into powder, and calcining the powder in air for 4 hours to obtain the boron-rhodium co-doped titanium dioxide, namely the titanium dioxide-based modified material. The material is used for photocatalytic hydrogen production, and the catalytic hydrogen production efficiency is effectively improved. The boron-rhodium co-doped titanium dioxide is prepared by adopting a one-pot sol-gel method, the absorption bandwidth of the titanium dioxide can be regulated and controlled by adjusting the rhodium doping proportion, and the light absorption and carrier separation efficiency is improved.